mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-25 03:55:09 +08:00
4ac1f4acd7
Signed-off-by: Nikolay Borisov <nborisov@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
10627 lines
283 KiB
C
10627 lines
283 KiB
C
/*
|
|
* Copyright (C) 2007 Oracle. All rights reserved.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public
|
|
* License v2 as published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public
|
|
* License along with this program; if not, write to the
|
|
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
|
* Boston, MA 021110-1307, USA.
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/bio.h>
|
|
#include <linux/buffer_head.h>
|
|
#include <linux/file.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/pagemap.h>
|
|
#include <linux/highmem.h>
|
|
#include <linux/time.h>
|
|
#include <linux/init.h>
|
|
#include <linux/string.h>
|
|
#include <linux/backing-dev.h>
|
|
#include <linux/mpage.h>
|
|
#include <linux/swap.h>
|
|
#include <linux/writeback.h>
|
|
#include <linux/compat.h>
|
|
#include <linux/bit_spinlock.h>
|
|
#include <linux/xattr.h>
|
|
#include <linux/posix_acl.h>
|
|
#include <linux/falloc.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/ratelimit.h>
|
|
#include <linux/mount.h>
|
|
#include <linux/btrfs.h>
|
|
#include <linux/blkdev.h>
|
|
#include <linux/posix_acl_xattr.h>
|
|
#include <linux/uio.h>
|
|
#include "ctree.h"
|
|
#include "disk-io.h"
|
|
#include "transaction.h"
|
|
#include "btrfs_inode.h"
|
|
#include "print-tree.h"
|
|
#include "ordered-data.h"
|
|
#include "xattr.h"
|
|
#include "tree-log.h"
|
|
#include "volumes.h"
|
|
#include "compression.h"
|
|
#include "locking.h"
|
|
#include "free-space-cache.h"
|
|
#include "inode-map.h"
|
|
#include "backref.h"
|
|
#include "hash.h"
|
|
#include "props.h"
|
|
#include "qgroup.h"
|
|
#include "dedupe.h"
|
|
|
|
struct btrfs_iget_args {
|
|
struct btrfs_key *location;
|
|
struct btrfs_root *root;
|
|
};
|
|
|
|
struct btrfs_dio_data {
|
|
u64 outstanding_extents;
|
|
u64 reserve;
|
|
u64 unsubmitted_oe_range_start;
|
|
u64 unsubmitted_oe_range_end;
|
|
int overwrite;
|
|
};
|
|
|
|
static const struct inode_operations btrfs_dir_inode_operations;
|
|
static const struct inode_operations btrfs_symlink_inode_operations;
|
|
static const struct inode_operations btrfs_dir_ro_inode_operations;
|
|
static const struct inode_operations btrfs_special_inode_operations;
|
|
static const struct inode_operations btrfs_file_inode_operations;
|
|
static const struct address_space_operations btrfs_aops;
|
|
static const struct address_space_operations btrfs_symlink_aops;
|
|
static const struct file_operations btrfs_dir_file_operations;
|
|
static const struct extent_io_ops btrfs_extent_io_ops;
|
|
|
|
static struct kmem_cache *btrfs_inode_cachep;
|
|
struct kmem_cache *btrfs_trans_handle_cachep;
|
|
struct kmem_cache *btrfs_transaction_cachep;
|
|
struct kmem_cache *btrfs_path_cachep;
|
|
struct kmem_cache *btrfs_free_space_cachep;
|
|
|
|
#define S_SHIFT 12
|
|
static const unsigned char btrfs_type_by_mode[S_IFMT >> S_SHIFT] = {
|
|
[S_IFREG >> S_SHIFT] = BTRFS_FT_REG_FILE,
|
|
[S_IFDIR >> S_SHIFT] = BTRFS_FT_DIR,
|
|
[S_IFCHR >> S_SHIFT] = BTRFS_FT_CHRDEV,
|
|
[S_IFBLK >> S_SHIFT] = BTRFS_FT_BLKDEV,
|
|
[S_IFIFO >> S_SHIFT] = BTRFS_FT_FIFO,
|
|
[S_IFSOCK >> S_SHIFT] = BTRFS_FT_SOCK,
|
|
[S_IFLNK >> S_SHIFT] = BTRFS_FT_SYMLINK,
|
|
};
|
|
|
|
static int btrfs_setsize(struct inode *inode, struct iattr *attr);
|
|
static int btrfs_truncate(struct inode *inode);
|
|
static int btrfs_finish_ordered_io(struct btrfs_ordered_extent *ordered_extent);
|
|
static noinline int cow_file_range(struct inode *inode,
|
|
struct page *locked_page,
|
|
u64 start, u64 end, u64 delalloc_end,
|
|
int *page_started, unsigned long *nr_written,
|
|
int unlock, struct btrfs_dedupe_hash *hash);
|
|
static struct extent_map *create_io_em(struct inode *inode, u64 start, u64 len,
|
|
u64 orig_start, u64 block_start,
|
|
u64 block_len, u64 orig_block_len,
|
|
u64 ram_bytes, int compress_type,
|
|
int type);
|
|
|
|
static int btrfs_dirty_inode(struct inode *inode);
|
|
|
|
#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
|
|
void btrfs_test_inode_set_ops(struct inode *inode)
|
|
{
|
|
BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops;
|
|
}
|
|
#endif
|
|
|
|
static int btrfs_init_inode_security(struct btrfs_trans_handle *trans,
|
|
struct inode *inode, struct inode *dir,
|
|
const struct qstr *qstr)
|
|
{
|
|
int err;
|
|
|
|
err = btrfs_init_acl(trans, inode, dir);
|
|
if (!err)
|
|
err = btrfs_xattr_security_init(trans, inode, dir, qstr);
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* this does all the hard work for inserting an inline extent into
|
|
* the btree. The caller should have done a btrfs_drop_extents so that
|
|
* no overlapping inline items exist in the btree
|
|
*/
|
|
static int insert_inline_extent(struct btrfs_trans_handle *trans,
|
|
struct btrfs_path *path, int extent_inserted,
|
|
struct btrfs_root *root, struct inode *inode,
|
|
u64 start, size_t size, size_t compressed_size,
|
|
int compress_type,
|
|
struct page **compressed_pages)
|
|
{
|
|
struct extent_buffer *leaf;
|
|
struct page *page = NULL;
|
|
char *kaddr;
|
|
unsigned long ptr;
|
|
struct btrfs_file_extent_item *ei;
|
|
int err = 0;
|
|
int ret;
|
|
size_t cur_size = size;
|
|
unsigned long offset;
|
|
|
|
if (compressed_size && compressed_pages)
|
|
cur_size = compressed_size;
|
|
|
|
inode_add_bytes(inode, size);
|
|
|
|
if (!extent_inserted) {
|
|
struct btrfs_key key;
|
|
size_t datasize;
|
|
|
|
key.objectid = btrfs_ino(BTRFS_I(inode));
|
|
key.offset = start;
|
|
key.type = BTRFS_EXTENT_DATA_KEY;
|
|
|
|
datasize = btrfs_file_extent_calc_inline_size(cur_size);
|
|
path->leave_spinning = 1;
|
|
ret = btrfs_insert_empty_item(trans, root, path, &key,
|
|
datasize);
|
|
if (ret) {
|
|
err = ret;
|
|
goto fail;
|
|
}
|
|
}
|
|
leaf = path->nodes[0];
|
|
ei = btrfs_item_ptr(leaf, path->slots[0],
|
|
struct btrfs_file_extent_item);
|
|
btrfs_set_file_extent_generation(leaf, ei, trans->transid);
|
|
btrfs_set_file_extent_type(leaf, ei, BTRFS_FILE_EXTENT_INLINE);
|
|
btrfs_set_file_extent_encryption(leaf, ei, 0);
|
|
btrfs_set_file_extent_other_encoding(leaf, ei, 0);
|
|
btrfs_set_file_extent_ram_bytes(leaf, ei, size);
|
|
ptr = btrfs_file_extent_inline_start(ei);
|
|
|
|
if (compress_type != BTRFS_COMPRESS_NONE) {
|
|
struct page *cpage;
|
|
int i = 0;
|
|
while (compressed_size > 0) {
|
|
cpage = compressed_pages[i];
|
|
cur_size = min_t(unsigned long, compressed_size,
|
|
PAGE_SIZE);
|
|
|
|
kaddr = kmap_atomic(cpage);
|
|
write_extent_buffer(leaf, kaddr, ptr, cur_size);
|
|
kunmap_atomic(kaddr);
|
|
|
|
i++;
|
|
ptr += cur_size;
|
|
compressed_size -= cur_size;
|
|
}
|
|
btrfs_set_file_extent_compression(leaf, ei,
|
|
compress_type);
|
|
} else {
|
|
page = find_get_page(inode->i_mapping,
|
|
start >> PAGE_SHIFT);
|
|
btrfs_set_file_extent_compression(leaf, ei, 0);
|
|
kaddr = kmap_atomic(page);
|
|
offset = start & (PAGE_SIZE - 1);
|
|
write_extent_buffer(leaf, kaddr + offset, ptr, size);
|
|
kunmap_atomic(kaddr);
|
|
put_page(page);
|
|
}
|
|
btrfs_mark_buffer_dirty(leaf);
|
|
btrfs_release_path(path);
|
|
|
|
/*
|
|
* we're an inline extent, so nobody can
|
|
* extend the file past i_size without locking
|
|
* a page we already have locked.
|
|
*
|
|
* We must do any isize and inode updates
|
|
* before we unlock the pages. Otherwise we
|
|
* could end up racing with unlink.
|
|
*/
|
|
BTRFS_I(inode)->disk_i_size = inode->i_size;
|
|
ret = btrfs_update_inode(trans, root, inode);
|
|
|
|
return ret;
|
|
fail:
|
|
return err;
|
|
}
|
|
|
|
|
|
/*
|
|
* conditionally insert an inline extent into the file. This
|
|
* does the checks required to make sure the data is small enough
|
|
* to fit as an inline extent.
|
|
*/
|
|
static noinline int cow_file_range_inline(struct btrfs_root *root,
|
|
struct inode *inode, u64 start,
|
|
u64 end, size_t compressed_size,
|
|
int compress_type,
|
|
struct page **compressed_pages)
|
|
{
|
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
|
struct btrfs_trans_handle *trans;
|
|
u64 isize = i_size_read(inode);
|
|
u64 actual_end = min(end + 1, isize);
|
|
u64 inline_len = actual_end - start;
|
|
u64 aligned_end = ALIGN(end, fs_info->sectorsize);
|
|
u64 data_len = inline_len;
|
|
int ret;
|
|
struct btrfs_path *path;
|
|
int extent_inserted = 0;
|
|
u32 extent_item_size;
|
|
|
|
if (compressed_size)
|
|
data_len = compressed_size;
|
|
|
|
if (start > 0 ||
|
|
actual_end > fs_info->sectorsize ||
|
|
data_len > BTRFS_MAX_INLINE_DATA_SIZE(fs_info) ||
|
|
(!compressed_size &&
|
|
(actual_end & (fs_info->sectorsize - 1)) == 0) ||
|
|
end + 1 < isize ||
|
|
data_len > fs_info->max_inline) {
|
|
return 1;
|
|
}
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
|
|
trans = btrfs_join_transaction(root);
|
|
if (IS_ERR(trans)) {
|
|
btrfs_free_path(path);
|
|
return PTR_ERR(trans);
|
|
}
|
|
trans->block_rsv = &fs_info->delalloc_block_rsv;
|
|
|
|
if (compressed_size && compressed_pages)
|
|
extent_item_size = btrfs_file_extent_calc_inline_size(
|
|
compressed_size);
|
|
else
|
|
extent_item_size = btrfs_file_extent_calc_inline_size(
|
|
inline_len);
|
|
|
|
ret = __btrfs_drop_extents(trans, root, inode, path,
|
|
start, aligned_end, NULL,
|
|
1, 1, extent_item_size, &extent_inserted);
|
|
if (ret) {
|
|
btrfs_abort_transaction(trans, ret);
|
|
goto out;
|
|
}
|
|
|
|
if (isize > actual_end)
|
|
inline_len = min_t(u64, isize, actual_end);
|
|
ret = insert_inline_extent(trans, path, extent_inserted,
|
|
root, inode, start,
|
|
inline_len, compressed_size,
|
|
compress_type, compressed_pages);
|
|
if (ret && ret != -ENOSPC) {
|
|
btrfs_abort_transaction(trans, ret);
|
|
goto out;
|
|
} else if (ret == -ENOSPC) {
|
|
ret = 1;
|
|
goto out;
|
|
}
|
|
|
|
set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, &BTRFS_I(inode)->runtime_flags);
|
|
btrfs_delalloc_release_metadata(BTRFS_I(inode), end + 1 - start);
|
|
btrfs_drop_extent_cache(BTRFS_I(inode), start, aligned_end - 1, 0);
|
|
out:
|
|
/*
|
|
* Don't forget to free the reserved space, as for inlined extent
|
|
* it won't count as data extent, free them directly here.
|
|
* And at reserve time, it's always aligned to page size, so
|
|
* just free one page here.
|
|
*/
|
|
btrfs_qgroup_free_data(inode, 0, PAGE_SIZE);
|
|
btrfs_free_path(path);
|
|
btrfs_end_transaction(trans);
|
|
return ret;
|
|
}
|
|
|
|
struct async_extent {
|
|
u64 start;
|
|
u64 ram_size;
|
|
u64 compressed_size;
|
|
struct page **pages;
|
|
unsigned long nr_pages;
|
|
int compress_type;
|
|
struct list_head list;
|
|
};
|
|
|
|
struct async_cow {
|
|
struct inode *inode;
|
|
struct btrfs_root *root;
|
|
struct page *locked_page;
|
|
u64 start;
|
|
u64 end;
|
|
struct list_head extents;
|
|
struct btrfs_work work;
|
|
};
|
|
|
|
static noinline int add_async_extent(struct async_cow *cow,
|
|
u64 start, u64 ram_size,
|
|
u64 compressed_size,
|
|
struct page **pages,
|
|
unsigned long nr_pages,
|
|
int compress_type)
|
|
{
|
|
struct async_extent *async_extent;
|
|
|
|
async_extent = kmalloc(sizeof(*async_extent), GFP_NOFS);
|
|
BUG_ON(!async_extent); /* -ENOMEM */
|
|
async_extent->start = start;
|
|
async_extent->ram_size = ram_size;
|
|
async_extent->compressed_size = compressed_size;
|
|
async_extent->pages = pages;
|
|
async_extent->nr_pages = nr_pages;
|
|
async_extent->compress_type = compress_type;
|
|
list_add_tail(&async_extent->list, &cow->extents);
|
|
return 0;
|
|
}
|
|
|
|
static inline int inode_need_compress(struct inode *inode)
|
|
{
|
|
struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
|
|
|
|
/* force compress */
|
|
if (btrfs_test_opt(fs_info, FORCE_COMPRESS))
|
|
return 1;
|
|
/* bad compression ratios */
|
|
if (BTRFS_I(inode)->flags & BTRFS_INODE_NOCOMPRESS)
|
|
return 0;
|
|
if (btrfs_test_opt(fs_info, COMPRESS) ||
|
|
BTRFS_I(inode)->flags & BTRFS_INODE_COMPRESS ||
|
|
BTRFS_I(inode)->force_compress)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
static inline void inode_should_defrag(struct btrfs_inode *inode,
|
|
u64 start, u64 end, u64 num_bytes, u64 small_write)
|
|
{
|
|
/* If this is a small write inside eof, kick off a defrag */
|
|
if (num_bytes < small_write &&
|
|
(start > 0 || end + 1 < inode->disk_i_size))
|
|
btrfs_add_inode_defrag(NULL, inode);
|
|
}
|
|
|
|
/*
|
|
* we create compressed extents in two phases. The first
|
|
* phase compresses a range of pages that have already been
|
|
* locked (both pages and state bits are locked).
|
|
*
|
|
* This is done inside an ordered work queue, and the compression
|
|
* is spread across many cpus. The actual IO submission is step
|
|
* two, and the ordered work queue takes care of making sure that
|
|
* happens in the same order things were put onto the queue by
|
|
* writepages and friends.
|
|
*
|
|
* If this code finds it can't get good compression, it puts an
|
|
* entry onto the work queue to write the uncompressed bytes. This
|
|
* makes sure that both compressed inodes and uncompressed inodes
|
|
* are written in the same order that the flusher thread sent them
|
|
* down.
|
|
*/
|
|
static noinline void compress_file_range(struct inode *inode,
|
|
struct page *locked_page,
|
|
u64 start, u64 end,
|
|
struct async_cow *async_cow,
|
|
int *num_added)
|
|
{
|
|
struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
|
|
struct btrfs_root *root = BTRFS_I(inode)->root;
|
|
u64 num_bytes;
|
|
u64 blocksize = fs_info->sectorsize;
|
|
u64 actual_end;
|
|
u64 isize = i_size_read(inode);
|
|
int ret = 0;
|
|
struct page **pages = NULL;
|
|
unsigned long nr_pages;
|
|
unsigned long nr_pages_ret = 0;
|
|
unsigned long total_compressed = 0;
|
|
unsigned long total_in = 0;
|
|
unsigned long max_compressed = SZ_128K;
|
|
unsigned long max_uncompressed = SZ_128K;
|
|
int i;
|
|
int will_compress;
|
|
int compress_type = fs_info->compress_type;
|
|
int redirty = 0;
|
|
|
|
inode_should_defrag(BTRFS_I(inode), start, end, end - start + 1,
|
|
SZ_16K);
|
|
|
|
actual_end = min_t(u64, isize, end + 1);
|
|
again:
|
|
will_compress = 0;
|
|
nr_pages = (end >> PAGE_SHIFT) - (start >> PAGE_SHIFT) + 1;
|
|
nr_pages = min_t(unsigned long, nr_pages, SZ_128K / PAGE_SIZE);
|
|
|
|
/*
|
|
* we don't want to send crud past the end of i_size through
|
|
* compression, that's just a waste of CPU time. So, if the
|
|
* end of the file is before the start of our current
|
|
* requested range of bytes, we bail out to the uncompressed
|
|
* cleanup code that can deal with all of this.
|
|
*
|
|
* It isn't really the fastest way to fix things, but this is a
|
|
* very uncommon corner.
|
|
*/
|
|
if (actual_end <= start)
|
|
goto cleanup_and_bail_uncompressed;
|
|
|
|
total_compressed = actual_end - start;
|
|
|
|
/*
|
|
* skip compression for a small file range(<=blocksize) that
|
|
* isn't an inline extent, since it doesn't save disk space at all.
|
|
*/
|
|
if (total_compressed <= blocksize &&
|
|
(start > 0 || end + 1 < BTRFS_I(inode)->disk_i_size))
|
|
goto cleanup_and_bail_uncompressed;
|
|
|
|
/* we want to make sure that amount of ram required to uncompress
|
|
* an extent is reasonable, so we limit the total size in ram
|
|
* of a compressed extent to 128k. This is a crucial number
|
|
* because it also controls how easily we can spread reads across
|
|
* cpus for decompression.
|
|
*
|
|
* We also want to make sure the amount of IO required to do
|
|
* a random read is reasonably small, so we limit the size of
|
|
* a compressed extent to 128k.
|
|
*/
|
|
total_compressed = min(total_compressed, max_uncompressed);
|
|
num_bytes = ALIGN(end - start + 1, blocksize);
|
|
num_bytes = max(blocksize, num_bytes);
|
|
total_in = 0;
|
|
ret = 0;
|
|
|
|
/*
|
|
* we do compression for mount -o compress and when the
|
|
* inode has not been flagged as nocompress. This flag can
|
|
* change at any time if we discover bad compression ratios.
|
|
*/
|
|
if (inode_need_compress(inode)) {
|
|
WARN_ON(pages);
|
|
pages = kcalloc(nr_pages, sizeof(struct page *), GFP_NOFS);
|
|
if (!pages) {
|
|
/* just bail out to the uncompressed code */
|
|
goto cont;
|
|
}
|
|
|
|
if (BTRFS_I(inode)->force_compress)
|
|
compress_type = BTRFS_I(inode)->force_compress;
|
|
|
|
/*
|
|
* we need to call clear_page_dirty_for_io on each
|
|
* page in the range. Otherwise applications with the file
|
|
* mmap'd can wander in and change the page contents while
|
|
* we are compressing them.
|
|
*
|
|
* If the compression fails for any reason, we set the pages
|
|
* dirty again later on.
|
|
*/
|
|
extent_range_clear_dirty_for_io(inode, start, end);
|
|
redirty = 1;
|
|
ret = btrfs_compress_pages(compress_type,
|
|
inode->i_mapping, start,
|
|
total_compressed, pages,
|
|
nr_pages, &nr_pages_ret,
|
|
&total_in,
|
|
&total_compressed,
|
|
max_compressed);
|
|
|
|
if (!ret) {
|
|
unsigned long offset = total_compressed &
|
|
(PAGE_SIZE - 1);
|
|
struct page *page = pages[nr_pages_ret - 1];
|
|
char *kaddr;
|
|
|
|
/* zero the tail end of the last page, we might be
|
|
* sending it down to disk
|
|
*/
|
|
if (offset) {
|
|
kaddr = kmap_atomic(page);
|
|
memset(kaddr + offset, 0,
|
|
PAGE_SIZE - offset);
|
|
kunmap_atomic(kaddr);
|
|
}
|
|
will_compress = 1;
|
|
}
|
|
}
|
|
cont:
|
|
if (start == 0) {
|
|
/* lets try to make an inline extent */
|
|
if (ret || total_in < (actual_end - start)) {
|
|
/* we didn't compress the entire range, try
|
|
* to make an uncompressed inline extent.
|
|
*/
|
|
ret = cow_file_range_inline(root, inode, start, end,
|
|
0, BTRFS_COMPRESS_NONE, NULL);
|
|
} else {
|
|
/* try making a compressed inline extent */
|
|
ret = cow_file_range_inline(root, inode, start, end,
|
|
total_compressed,
|
|
compress_type, pages);
|
|
}
|
|
if (ret <= 0) {
|
|
unsigned long clear_flags = EXTENT_DELALLOC |
|
|
EXTENT_DEFRAG;
|
|
unsigned long page_error_op;
|
|
|
|
clear_flags |= (ret < 0) ? EXTENT_DO_ACCOUNTING : 0;
|
|
page_error_op = ret < 0 ? PAGE_SET_ERROR : 0;
|
|
|
|
/*
|
|
* inline extent creation worked or returned error,
|
|
* we don't need to create any more async work items.
|
|
* Unlock and free up our temp pages.
|
|
*/
|
|
extent_clear_unlock_delalloc(inode, start, end, end,
|
|
NULL, clear_flags,
|
|
PAGE_UNLOCK |
|
|
PAGE_CLEAR_DIRTY |
|
|
PAGE_SET_WRITEBACK |
|
|
page_error_op |
|
|
PAGE_END_WRITEBACK);
|
|
btrfs_free_reserved_data_space_noquota(inode, start,
|
|
end - start + 1);
|
|
goto free_pages_out;
|
|
}
|
|
}
|
|
|
|
if (will_compress) {
|
|
/*
|
|
* we aren't doing an inline extent round the compressed size
|
|
* up to a block size boundary so the allocator does sane
|
|
* things
|
|
*/
|
|
total_compressed = ALIGN(total_compressed, blocksize);
|
|
|
|
/*
|
|
* one last check to make sure the compression is really a
|
|
* win, compare the page count read with the blocks on disk
|
|
*/
|
|
total_in = ALIGN(total_in, PAGE_SIZE);
|
|
if (total_compressed >= total_in) {
|
|
will_compress = 0;
|
|
} else {
|
|
num_bytes = total_in;
|
|
*num_added += 1;
|
|
|
|
/*
|
|
* The async work queues will take care of doing actual
|
|
* allocation on disk for these compressed pages, and
|
|
* will submit them to the elevator.
|
|
*/
|
|
add_async_extent(async_cow, start, num_bytes,
|
|
total_compressed, pages, nr_pages_ret,
|
|
compress_type);
|
|
|
|
if (start + num_bytes < end) {
|
|
start += num_bytes;
|
|
pages = NULL;
|
|
cond_resched();
|
|
goto again;
|
|
}
|
|
return;
|
|
}
|
|
}
|
|
if (pages) {
|
|
/*
|
|
* the compression code ran but failed to make things smaller,
|
|
* free any pages it allocated and our page pointer array
|
|
*/
|
|
for (i = 0; i < nr_pages_ret; i++) {
|
|
WARN_ON(pages[i]->mapping);
|
|
put_page(pages[i]);
|
|
}
|
|
kfree(pages);
|
|
pages = NULL;
|
|
total_compressed = 0;
|
|
nr_pages_ret = 0;
|
|
|
|
/* flag the file so we don't compress in the future */
|
|
if (!btrfs_test_opt(fs_info, FORCE_COMPRESS) &&
|
|
!(BTRFS_I(inode)->force_compress)) {
|
|
BTRFS_I(inode)->flags |= BTRFS_INODE_NOCOMPRESS;
|
|
}
|
|
}
|
|
cleanup_and_bail_uncompressed:
|
|
/*
|
|
* No compression, but we still need to write the pages in the file
|
|
* we've been given so far. redirty the locked page if it corresponds
|
|
* to our extent and set things up for the async work queue to run
|
|
* cow_file_range to do the normal delalloc dance.
|
|
*/
|
|
if (page_offset(locked_page) >= start &&
|
|
page_offset(locked_page) <= end)
|
|
__set_page_dirty_nobuffers(locked_page);
|
|
/* unlocked later on in the async handlers */
|
|
|
|
if (redirty)
|
|
extent_range_redirty_for_io(inode, start, end);
|
|
add_async_extent(async_cow, start, end - start + 1, 0, NULL, 0,
|
|
BTRFS_COMPRESS_NONE);
|
|
*num_added += 1;
|
|
|
|
return;
|
|
|
|
free_pages_out:
|
|
for (i = 0; i < nr_pages_ret; i++) {
|
|
WARN_ON(pages[i]->mapping);
|
|
put_page(pages[i]);
|
|
}
|
|
kfree(pages);
|
|
}
|
|
|
|
static void free_async_extent_pages(struct async_extent *async_extent)
|
|
{
|
|
int i;
|
|
|
|
if (!async_extent->pages)
|
|
return;
|
|
|
|
for (i = 0; i < async_extent->nr_pages; i++) {
|
|
WARN_ON(async_extent->pages[i]->mapping);
|
|
put_page(async_extent->pages[i]);
|
|
}
|
|
kfree(async_extent->pages);
|
|
async_extent->nr_pages = 0;
|
|
async_extent->pages = NULL;
|
|
}
|
|
|
|
/*
|
|
* phase two of compressed writeback. This is the ordered portion
|
|
* of the code, which only gets called in the order the work was
|
|
* queued. We walk all the async extents created by compress_file_range
|
|
* and send them down to the disk.
|
|
*/
|
|
static noinline void submit_compressed_extents(struct inode *inode,
|
|
struct async_cow *async_cow)
|
|
{
|
|
struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
|
|
struct async_extent *async_extent;
|
|
u64 alloc_hint = 0;
|
|
struct btrfs_key ins;
|
|
struct extent_map *em;
|
|
struct btrfs_root *root = BTRFS_I(inode)->root;
|
|
struct extent_io_tree *io_tree;
|
|
int ret = 0;
|
|
|
|
again:
|
|
while (!list_empty(&async_cow->extents)) {
|
|
async_extent = list_entry(async_cow->extents.next,
|
|
struct async_extent, list);
|
|
list_del(&async_extent->list);
|
|
|
|
io_tree = &BTRFS_I(inode)->io_tree;
|
|
|
|
retry:
|
|
/* did the compression code fall back to uncompressed IO? */
|
|
if (!async_extent->pages) {
|
|
int page_started = 0;
|
|
unsigned long nr_written = 0;
|
|
|
|
lock_extent(io_tree, async_extent->start,
|
|
async_extent->start +
|
|
async_extent->ram_size - 1);
|
|
|
|
/* allocate blocks */
|
|
ret = cow_file_range(inode, async_cow->locked_page,
|
|
async_extent->start,
|
|
async_extent->start +
|
|
async_extent->ram_size - 1,
|
|
async_extent->start +
|
|
async_extent->ram_size - 1,
|
|
&page_started, &nr_written, 0,
|
|
NULL);
|
|
|
|
/* JDM XXX */
|
|
|
|
/*
|
|
* if page_started, cow_file_range inserted an
|
|
* inline extent and took care of all the unlocking
|
|
* and IO for us. Otherwise, we need to submit
|
|
* all those pages down to the drive.
|
|
*/
|
|
if (!page_started && !ret)
|
|
extent_write_locked_range(io_tree,
|
|
inode, async_extent->start,
|
|
async_extent->start +
|
|
async_extent->ram_size - 1,
|
|
btrfs_get_extent,
|
|
WB_SYNC_ALL);
|
|
else if (ret)
|
|
unlock_page(async_cow->locked_page);
|
|
kfree(async_extent);
|
|
cond_resched();
|
|
continue;
|
|
}
|
|
|
|
lock_extent(io_tree, async_extent->start,
|
|
async_extent->start + async_extent->ram_size - 1);
|
|
|
|
ret = btrfs_reserve_extent(root, async_extent->ram_size,
|
|
async_extent->compressed_size,
|
|
async_extent->compressed_size,
|
|
0, alloc_hint, &ins, 1, 1);
|
|
if (ret) {
|
|
free_async_extent_pages(async_extent);
|
|
|
|
if (ret == -ENOSPC) {
|
|
unlock_extent(io_tree, async_extent->start,
|
|
async_extent->start +
|
|
async_extent->ram_size - 1);
|
|
|
|
/*
|
|
* we need to redirty the pages if we decide to
|
|
* fallback to uncompressed IO, otherwise we
|
|
* will not submit these pages down to lower
|
|
* layers.
|
|
*/
|
|
extent_range_redirty_for_io(inode,
|
|
async_extent->start,
|
|
async_extent->start +
|
|
async_extent->ram_size - 1);
|
|
|
|
goto retry;
|
|
}
|
|
goto out_free;
|
|
}
|
|
/*
|
|
* here we're doing allocation and writeback of the
|
|
* compressed pages
|
|
*/
|
|
em = create_io_em(inode, async_extent->start,
|
|
async_extent->ram_size, /* len */
|
|
async_extent->start, /* orig_start */
|
|
ins.objectid, /* block_start */
|
|
ins.offset, /* block_len */
|
|
ins.offset, /* orig_block_len */
|
|
async_extent->ram_size, /* ram_bytes */
|
|
async_extent->compress_type,
|
|
BTRFS_ORDERED_COMPRESSED);
|
|
if (IS_ERR(em))
|
|
/* ret value is not necessary due to void function */
|
|
goto out_free_reserve;
|
|
free_extent_map(em);
|
|
|
|
ret = btrfs_add_ordered_extent_compress(inode,
|
|
async_extent->start,
|
|
ins.objectid,
|
|
async_extent->ram_size,
|
|
ins.offset,
|
|
BTRFS_ORDERED_COMPRESSED,
|
|
async_extent->compress_type);
|
|
if (ret) {
|
|
btrfs_drop_extent_cache(BTRFS_I(inode),
|
|
async_extent->start,
|
|
async_extent->start +
|
|
async_extent->ram_size - 1, 0);
|
|
goto out_free_reserve;
|
|
}
|
|
btrfs_dec_block_group_reservations(fs_info, ins.objectid);
|
|
|
|
/*
|
|
* clear dirty, set writeback and unlock the pages.
|
|
*/
|
|
extent_clear_unlock_delalloc(inode, async_extent->start,
|
|
async_extent->start +
|
|
async_extent->ram_size - 1,
|
|
async_extent->start +
|
|
async_extent->ram_size - 1,
|
|
NULL, EXTENT_LOCKED | EXTENT_DELALLOC,
|
|
PAGE_UNLOCK | PAGE_CLEAR_DIRTY |
|
|
PAGE_SET_WRITEBACK);
|
|
ret = btrfs_submit_compressed_write(inode,
|
|
async_extent->start,
|
|
async_extent->ram_size,
|
|
ins.objectid,
|
|
ins.offset, async_extent->pages,
|
|
async_extent->nr_pages);
|
|
if (ret) {
|
|
struct extent_io_tree *tree = &BTRFS_I(inode)->io_tree;
|
|
struct page *p = async_extent->pages[0];
|
|
const u64 start = async_extent->start;
|
|
const u64 end = start + async_extent->ram_size - 1;
|
|
|
|
p->mapping = inode->i_mapping;
|
|
tree->ops->writepage_end_io_hook(p, start, end,
|
|
NULL, 0);
|
|
p->mapping = NULL;
|
|
extent_clear_unlock_delalloc(inode, start, end, end,
|
|
NULL, 0,
|
|
PAGE_END_WRITEBACK |
|
|
PAGE_SET_ERROR);
|
|
free_async_extent_pages(async_extent);
|
|
}
|
|
alloc_hint = ins.objectid + ins.offset;
|
|
kfree(async_extent);
|
|
cond_resched();
|
|
}
|
|
return;
|
|
out_free_reserve:
|
|
btrfs_dec_block_group_reservations(fs_info, ins.objectid);
|
|
btrfs_free_reserved_extent(fs_info, ins.objectid, ins.offset, 1);
|
|
out_free:
|
|
extent_clear_unlock_delalloc(inode, async_extent->start,
|
|
async_extent->start +
|
|
async_extent->ram_size - 1,
|
|
async_extent->start +
|
|
async_extent->ram_size - 1,
|
|
NULL, EXTENT_LOCKED | EXTENT_DELALLOC |
|
|
EXTENT_DEFRAG | EXTENT_DO_ACCOUNTING,
|
|
PAGE_UNLOCK | PAGE_CLEAR_DIRTY |
|
|
PAGE_SET_WRITEBACK | PAGE_END_WRITEBACK |
|
|
PAGE_SET_ERROR);
|
|
free_async_extent_pages(async_extent);
|
|
kfree(async_extent);
|
|
goto again;
|
|
}
|
|
|
|
static u64 get_extent_allocation_hint(struct inode *inode, u64 start,
|
|
u64 num_bytes)
|
|
{
|
|
struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
|
|
struct extent_map *em;
|
|
u64 alloc_hint = 0;
|
|
|
|
read_lock(&em_tree->lock);
|
|
em = search_extent_mapping(em_tree, start, num_bytes);
|
|
if (em) {
|
|
/*
|
|
* if block start isn't an actual block number then find the
|
|
* first block in this inode and use that as a hint. If that
|
|
* block is also bogus then just don't worry about it.
|
|
*/
|
|
if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
|
|
free_extent_map(em);
|
|
em = search_extent_mapping(em_tree, 0, 0);
|
|
if (em && em->block_start < EXTENT_MAP_LAST_BYTE)
|
|
alloc_hint = em->block_start;
|
|
if (em)
|
|
free_extent_map(em);
|
|
} else {
|
|
alloc_hint = em->block_start;
|
|
free_extent_map(em);
|
|
}
|
|
}
|
|
read_unlock(&em_tree->lock);
|
|
|
|
return alloc_hint;
|
|
}
|
|
|
|
/*
|
|
* when extent_io.c finds a delayed allocation range in the file,
|
|
* the call backs end up in this code. The basic idea is to
|
|
* allocate extents on disk for the range, and create ordered data structs
|
|
* in ram to track those extents.
|
|
*
|
|
* locked_page is the page that writepage had locked already. We use
|
|
* it to make sure we don't do extra locks or unlocks.
|
|
*
|
|
* *page_started is set to one if we unlock locked_page and do everything
|
|
* required to start IO on it. It may be clean and already done with
|
|
* IO when we return.
|
|
*/
|
|
static noinline int cow_file_range(struct inode *inode,
|
|
struct page *locked_page,
|
|
u64 start, u64 end, u64 delalloc_end,
|
|
int *page_started, unsigned long *nr_written,
|
|
int unlock, struct btrfs_dedupe_hash *hash)
|
|
{
|
|
struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
|
|
struct btrfs_root *root = BTRFS_I(inode)->root;
|
|
u64 alloc_hint = 0;
|
|
u64 num_bytes;
|
|
unsigned long ram_size;
|
|
u64 disk_num_bytes;
|
|
u64 cur_alloc_size;
|
|
u64 blocksize = fs_info->sectorsize;
|
|
struct btrfs_key ins;
|
|
struct extent_map *em;
|
|
int ret = 0;
|
|
|
|
if (btrfs_is_free_space_inode(BTRFS_I(inode))) {
|
|
WARN_ON_ONCE(1);
|
|
ret = -EINVAL;
|
|
goto out_unlock;
|
|
}
|
|
|
|
num_bytes = ALIGN(end - start + 1, blocksize);
|
|
num_bytes = max(blocksize, num_bytes);
|
|
disk_num_bytes = num_bytes;
|
|
|
|
inode_should_defrag(BTRFS_I(inode), start, end, num_bytes, SZ_64K);
|
|
|
|
if (start == 0) {
|
|
/* lets try to make an inline extent */
|
|
ret = cow_file_range_inline(root, inode, start, end, 0,
|
|
BTRFS_COMPRESS_NONE, NULL);
|
|
if (ret == 0) {
|
|
extent_clear_unlock_delalloc(inode, start, end,
|
|
delalloc_end, NULL,
|
|
EXTENT_LOCKED | EXTENT_DELALLOC |
|
|
EXTENT_DEFRAG, PAGE_UNLOCK |
|
|
PAGE_CLEAR_DIRTY | PAGE_SET_WRITEBACK |
|
|
PAGE_END_WRITEBACK);
|
|
btrfs_free_reserved_data_space_noquota(inode, start,
|
|
end - start + 1);
|
|
*nr_written = *nr_written +
|
|
(end - start + PAGE_SIZE) / PAGE_SIZE;
|
|
*page_started = 1;
|
|
goto out;
|
|
} else if (ret < 0) {
|
|
goto out_unlock;
|
|
}
|
|
}
|
|
|
|
BUG_ON(disk_num_bytes >
|
|
btrfs_super_total_bytes(fs_info->super_copy));
|
|
|
|
alloc_hint = get_extent_allocation_hint(inode, start, num_bytes);
|
|
btrfs_drop_extent_cache(BTRFS_I(inode), start,
|
|
start + num_bytes - 1, 0);
|
|
|
|
while (disk_num_bytes > 0) {
|
|
unsigned long op;
|
|
|
|
cur_alloc_size = disk_num_bytes;
|
|
ret = btrfs_reserve_extent(root, cur_alloc_size, cur_alloc_size,
|
|
fs_info->sectorsize, 0, alloc_hint,
|
|
&ins, 1, 1);
|
|
if (ret < 0)
|
|
goto out_unlock;
|
|
|
|
ram_size = ins.offset;
|
|
em = create_io_em(inode, start, ins.offset, /* len */
|
|
start, /* orig_start */
|
|
ins.objectid, /* block_start */
|
|
ins.offset, /* block_len */
|
|
ins.offset, /* orig_block_len */
|
|
ram_size, /* ram_bytes */
|
|
BTRFS_COMPRESS_NONE, /* compress_type */
|
|
BTRFS_ORDERED_REGULAR /* type */);
|
|
if (IS_ERR(em))
|
|
goto out_reserve;
|
|
free_extent_map(em);
|
|
|
|
cur_alloc_size = ins.offset;
|
|
ret = btrfs_add_ordered_extent(inode, start, ins.objectid,
|
|
ram_size, cur_alloc_size, 0);
|
|
if (ret)
|
|
goto out_drop_extent_cache;
|
|
|
|
if (root->root_key.objectid ==
|
|
BTRFS_DATA_RELOC_TREE_OBJECTID) {
|
|
ret = btrfs_reloc_clone_csums(inode, start,
|
|
cur_alloc_size);
|
|
if (ret)
|
|
goto out_drop_extent_cache;
|
|
}
|
|
|
|
btrfs_dec_block_group_reservations(fs_info, ins.objectid);
|
|
|
|
if (disk_num_bytes < cur_alloc_size)
|
|
break;
|
|
|
|
/* we're not doing compressed IO, don't unlock the first
|
|
* page (which the caller expects to stay locked), don't
|
|
* clear any dirty bits and don't set any writeback bits
|
|
*
|
|
* Do set the Private2 bit so we know this page was properly
|
|
* setup for writepage
|
|
*/
|
|
op = unlock ? PAGE_UNLOCK : 0;
|
|
op |= PAGE_SET_PRIVATE2;
|
|
|
|
extent_clear_unlock_delalloc(inode, start,
|
|
start + ram_size - 1,
|
|
delalloc_end, locked_page,
|
|
EXTENT_LOCKED | EXTENT_DELALLOC,
|
|
op);
|
|
disk_num_bytes -= cur_alloc_size;
|
|
num_bytes -= cur_alloc_size;
|
|
alloc_hint = ins.objectid + ins.offset;
|
|
start += cur_alloc_size;
|
|
}
|
|
out:
|
|
return ret;
|
|
|
|
out_drop_extent_cache:
|
|
btrfs_drop_extent_cache(BTRFS_I(inode), start, start + ram_size - 1, 0);
|
|
out_reserve:
|
|
btrfs_dec_block_group_reservations(fs_info, ins.objectid);
|
|
btrfs_free_reserved_extent(fs_info, ins.objectid, ins.offset, 1);
|
|
out_unlock:
|
|
extent_clear_unlock_delalloc(inode, start, end, delalloc_end,
|
|
locked_page,
|
|
EXTENT_LOCKED | EXTENT_DO_ACCOUNTING |
|
|
EXTENT_DELALLOC | EXTENT_DEFRAG,
|
|
PAGE_UNLOCK | PAGE_CLEAR_DIRTY |
|
|
PAGE_SET_WRITEBACK | PAGE_END_WRITEBACK);
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* work queue call back to started compression on a file and pages
|
|
*/
|
|
static noinline void async_cow_start(struct btrfs_work *work)
|
|
{
|
|
struct async_cow *async_cow;
|
|
int num_added = 0;
|
|
async_cow = container_of(work, struct async_cow, work);
|
|
|
|
compress_file_range(async_cow->inode, async_cow->locked_page,
|
|
async_cow->start, async_cow->end, async_cow,
|
|
&num_added);
|
|
if (num_added == 0) {
|
|
btrfs_add_delayed_iput(async_cow->inode);
|
|
async_cow->inode = NULL;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* work queue call back to submit previously compressed pages
|
|
*/
|
|
static noinline void async_cow_submit(struct btrfs_work *work)
|
|
{
|
|
struct btrfs_fs_info *fs_info;
|
|
struct async_cow *async_cow;
|
|
struct btrfs_root *root;
|
|
unsigned long nr_pages;
|
|
|
|
async_cow = container_of(work, struct async_cow, work);
|
|
|
|
root = async_cow->root;
|
|
fs_info = root->fs_info;
|
|
nr_pages = (async_cow->end - async_cow->start + PAGE_SIZE) >>
|
|
PAGE_SHIFT;
|
|
|
|
/*
|
|
* atomic_sub_return implies a barrier for waitqueue_active
|
|
*/
|
|
if (atomic_sub_return(nr_pages, &fs_info->async_delalloc_pages) <
|
|
5 * SZ_1M &&
|
|
waitqueue_active(&fs_info->async_submit_wait))
|
|
wake_up(&fs_info->async_submit_wait);
|
|
|
|
if (async_cow->inode)
|
|
submit_compressed_extents(async_cow->inode, async_cow);
|
|
}
|
|
|
|
static noinline void async_cow_free(struct btrfs_work *work)
|
|
{
|
|
struct async_cow *async_cow;
|
|
async_cow = container_of(work, struct async_cow, work);
|
|
if (async_cow->inode)
|
|
btrfs_add_delayed_iput(async_cow->inode);
|
|
kfree(async_cow);
|
|
}
|
|
|
|
static int cow_file_range_async(struct inode *inode, struct page *locked_page,
|
|
u64 start, u64 end, int *page_started,
|
|
unsigned long *nr_written)
|
|
{
|
|
struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
|
|
struct async_cow *async_cow;
|
|
struct btrfs_root *root = BTRFS_I(inode)->root;
|
|
unsigned long nr_pages;
|
|
u64 cur_end;
|
|
|
|
clear_extent_bit(&BTRFS_I(inode)->io_tree, start, end, EXTENT_LOCKED,
|
|
1, 0, NULL, GFP_NOFS);
|
|
while (start < end) {
|
|
async_cow = kmalloc(sizeof(*async_cow), GFP_NOFS);
|
|
BUG_ON(!async_cow); /* -ENOMEM */
|
|
async_cow->inode = igrab(inode);
|
|
async_cow->root = root;
|
|
async_cow->locked_page = locked_page;
|
|
async_cow->start = start;
|
|
|
|
if (BTRFS_I(inode)->flags & BTRFS_INODE_NOCOMPRESS &&
|
|
!btrfs_test_opt(fs_info, FORCE_COMPRESS))
|
|
cur_end = end;
|
|
else
|
|
cur_end = min(end, start + SZ_512K - 1);
|
|
|
|
async_cow->end = cur_end;
|
|
INIT_LIST_HEAD(&async_cow->extents);
|
|
|
|
btrfs_init_work(&async_cow->work,
|
|
btrfs_delalloc_helper,
|
|
async_cow_start, async_cow_submit,
|
|
async_cow_free);
|
|
|
|
nr_pages = (cur_end - start + PAGE_SIZE) >>
|
|
PAGE_SHIFT;
|
|
atomic_add(nr_pages, &fs_info->async_delalloc_pages);
|
|
|
|
btrfs_queue_work(fs_info->delalloc_workers, &async_cow->work);
|
|
|
|
while (atomic_read(&fs_info->async_submit_draining) &&
|
|
atomic_read(&fs_info->async_delalloc_pages)) {
|
|
wait_event(fs_info->async_submit_wait,
|
|
(atomic_read(&fs_info->async_delalloc_pages) ==
|
|
0));
|
|
}
|
|
|
|
*nr_written += nr_pages;
|
|
start = cur_end + 1;
|
|
}
|
|
*page_started = 1;
|
|
return 0;
|
|
}
|
|
|
|
static noinline int csum_exist_in_range(struct btrfs_fs_info *fs_info,
|
|
u64 bytenr, u64 num_bytes)
|
|
{
|
|
int ret;
|
|
struct btrfs_ordered_sum *sums;
|
|
LIST_HEAD(list);
|
|
|
|
ret = btrfs_lookup_csums_range(fs_info->csum_root, bytenr,
|
|
bytenr + num_bytes - 1, &list, 0);
|
|
if (ret == 0 && list_empty(&list))
|
|
return 0;
|
|
|
|
while (!list_empty(&list)) {
|
|
sums = list_entry(list.next, struct btrfs_ordered_sum, list);
|
|
list_del(&sums->list);
|
|
kfree(sums);
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* when nowcow writeback call back. This checks for snapshots or COW copies
|
|
* of the extents that exist in the file, and COWs the file as required.
|
|
*
|
|
* If no cow copies or snapshots exist, we write directly to the existing
|
|
* blocks on disk
|
|
*/
|
|
static noinline int run_delalloc_nocow(struct inode *inode,
|
|
struct page *locked_page,
|
|
u64 start, u64 end, int *page_started, int force,
|
|
unsigned long *nr_written)
|
|
{
|
|
struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
|
|
struct btrfs_root *root = BTRFS_I(inode)->root;
|
|
struct extent_buffer *leaf;
|
|
struct btrfs_path *path;
|
|
struct btrfs_file_extent_item *fi;
|
|
struct btrfs_key found_key;
|
|
struct extent_map *em;
|
|
u64 cow_start;
|
|
u64 cur_offset;
|
|
u64 extent_end;
|
|
u64 extent_offset;
|
|
u64 disk_bytenr;
|
|
u64 num_bytes;
|
|
u64 disk_num_bytes;
|
|
u64 ram_bytes;
|
|
int extent_type;
|
|
int ret, err;
|
|
int type;
|
|
int nocow;
|
|
int check_prev = 1;
|
|
bool nolock;
|
|
u64 ino = btrfs_ino(BTRFS_I(inode));
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path) {
|
|
extent_clear_unlock_delalloc(inode, start, end, end,
|
|
locked_page,
|
|
EXTENT_LOCKED | EXTENT_DELALLOC |
|
|
EXTENT_DO_ACCOUNTING |
|
|
EXTENT_DEFRAG, PAGE_UNLOCK |
|
|
PAGE_CLEAR_DIRTY |
|
|
PAGE_SET_WRITEBACK |
|
|
PAGE_END_WRITEBACK);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
nolock = btrfs_is_free_space_inode(BTRFS_I(inode));
|
|
|
|
cow_start = (u64)-1;
|
|
cur_offset = start;
|
|
while (1) {
|
|
ret = btrfs_lookup_file_extent(NULL, root, path, ino,
|
|
cur_offset, 0);
|
|
if (ret < 0)
|
|
goto error;
|
|
if (ret > 0 && path->slots[0] > 0 && check_prev) {
|
|
leaf = path->nodes[0];
|
|
btrfs_item_key_to_cpu(leaf, &found_key,
|
|
path->slots[0] - 1);
|
|
if (found_key.objectid == ino &&
|
|
found_key.type == BTRFS_EXTENT_DATA_KEY)
|
|
path->slots[0]--;
|
|
}
|
|
check_prev = 0;
|
|
next_slot:
|
|
leaf = path->nodes[0];
|
|
if (path->slots[0] >= btrfs_header_nritems(leaf)) {
|
|
ret = btrfs_next_leaf(root, path);
|
|
if (ret < 0)
|
|
goto error;
|
|
if (ret > 0)
|
|
break;
|
|
leaf = path->nodes[0];
|
|
}
|
|
|
|
nocow = 0;
|
|
disk_bytenr = 0;
|
|
num_bytes = 0;
|
|
btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
|
|
|
|
if (found_key.objectid > ino)
|
|
break;
|
|
if (WARN_ON_ONCE(found_key.objectid < ino) ||
|
|
found_key.type < BTRFS_EXTENT_DATA_KEY) {
|
|
path->slots[0]++;
|
|
goto next_slot;
|
|
}
|
|
if (found_key.type > BTRFS_EXTENT_DATA_KEY ||
|
|
found_key.offset > end)
|
|
break;
|
|
|
|
if (found_key.offset > cur_offset) {
|
|
extent_end = found_key.offset;
|
|
extent_type = 0;
|
|
goto out_check;
|
|
}
|
|
|
|
fi = btrfs_item_ptr(leaf, path->slots[0],
|
|
struct btrfs_file_extent_item);
|
|
extent_type = btrfs_file_extent_type(leaf, fi);
|
|
|
|
ram_bytes = btrfs_file_extent_ram_bytes(leaf, fi);
|
|
if (extent_type == BTRFS_FILE_EXTENT_REG ||
|
|
extent_type == BTRFS_FILE_EXTENT_PREALLOC) {
|
|
disk_bytenr = btrfs_file_extent_disk_bytenr(leaf, fi);
|
|
extent_offset = btrfs_file_extent_offset(leaf, fi);
|
|
extent_end = found_key.offset +
|
|
btrfs_file_extent_num_bytes(leaf, fi);
|
|
disk_num_bytes =
|
|
btrfs_file_extent_disk_num_bytes(leaf, fi);
|
|
if (extent_end <= start) {
|
|
path->slots[0]++;
|
|
goto next_slot;
|
|
}
|
|
if (disk_bytenr == 0)
|
|
goto out_check;
|
|
if (btrfs_file_extent_compression(leaf, fi) ||
|
|
btrfs_file_extent_encryption(leaf, fi) ||
|
|
btrfs_file_extent_other_encoding(leaf, fi))
|
|
goto out_check;
|
|
if (extent_type == BTRFS_FILE_EXTENT_REG && !force)
|
|
goto out_check;
|
|
if (btrfs_extent_readonly(fs_info, disk_bytenr))
|
|
goto out_check;
|
|
if (btrfs_cross_ref_exist(root, ino,
|
|
found_key.offset -
|
|
extent_offset, disk_bytenr))
|
|
goto out_check;
|
|
disk_bytenr += extent_offset;
|
|
disk_bytenr += cur_offset - found_key.offset;
|
|
num_bytes = min(end + 1, extent_end) - cur_offset;
|
|
/*
|
|
* if there are pending snapshots for this root,
|
|
* we fall into common COW way.
|
|
*/
|
|
if (!nolock) {
|
|
err = btrfs_start_write_no_snapshoting(root);
|
|
if (!err)
|
|
goto out_check;
|
|
}
|
|
/*
|
|
* force cow if csum exists in the range.
|
|
* this ensure that csum for a given extent are
|
|
* either valid or do not exist.
|
|
*/
|
|
if (csum_exist_in_range(fs_info, disk_bytenr,
|
|
num_bytes))
|
|
goto out_check;
|
|
if (!btrfs_inc_nocow_writers(fs_info, disk_bytenr))
|
|
goto out_check;
|
|
nocow = 1;
|
|
} else if (extent_type == BTRFS_FILE_EXTENT_INLINE) {
|
|
extent_end = found_key.offset +
|
|
btrfs_file_extent_inline_len(leaf,
|
|
path->slots[0], fi);
|
|
extent_end = ALIGN(extent_end,
|
|
fs_info->sectorsize);
|
|
} else {
|
|
BUG_ON(1);
|
|
}
|
|
out_check:
|
|
if (extent_end <= start) {
|
|
path->slots[0]++;
|
|
if (!nolock && nocow)
|
|
btrfs_end_write_no_snapshoting(root);
|
|
if (nocow)
|
|
btrfs_dec_nocow_writers(fs_info, disk_bytenr);
|
|
goto next_slot;
|
|
}
|
|
if (!nocow) {
|
|
if (cow_start == (u64)-1)
|
|
cow_start = cur_offset;
|
|
cur_offset = extent_end;
|
|
if (cur_offset > end)
|
|
break;
|
|
path->slots[0]++;
|
|
goto next_slot;
|
|
}
|
|
|
|
btrfs_release_path(path);
|
|
if (cow_start != (u64)-1) {
|
|
ret = cow_file_range(inode, locked_page,
|
|
cow_start, found_key.offset - 1,
|
|
end, page_started, nr_written, 1,
|
|
NULL);
|
|
if (ret) {
|
|
if (!nolock && nocow)
|
|
btrfs_end_write_no_snapshoting(root);
|
|
if (nocow)
|
|
btrfs_dec_nocow_writers(fs_info,
|
|
disk_bytenr);
|
|
goto error;
|
|
}
|
|
cow_start = (u64)-1;
|
|
}
|
|
|
|
if (extent_type == BTRFS_FILE_EXTENT_PREALLOC) {
|
|
u64 orig_start = found_key.offset - extent_offset;
|
|
|
|
em = create_io_em(inode, cur_offset, num_bytes,
|
|
orig_start,
|
|
disk_bytenr, /* block_start */
|
|
num_bytes, /* block_len */
|
|
disk_num_bytes, /* orig_block_len */
|
|
ram_bytes, BTRFS_COMPRESS_NONE,
|
|
BTRFS_ORDERED_PREALLOC);
|
|
if (IS_ERR(em)) {
|
|
if (!nolock && nocow)
|
|
btrfs_end_write_no_snapshoting(root);
|
|
if (nocow)
|
|
btrfs_dec_nocow_writers(fs_info,
|
|
disk_bytenr);
|
|
ret = PTR_ERR(em);
|
|
goto error;
|
|
}
|
|
free_extent_map(em);
|
|
}
|
|
|
|
if (extent_type == BTRFS_FILE_EXTENT_PREALLOC) {
|
|
type = BTRFS_ORDERED_PREALLOC;
|
|
} else {
|
|
type = BTRFS_ORDERED_NOCOW;
|
|
}
|
|
|
|
ret = btrfs_add_ordered_extent(inode, cur_offset, disk_bytenr,
|
|
num_bytes, num_bytes, type);
|
|
if (nocow)
|
|
btrfs_dec_nocow_writers(fs_info, disk_bytenr);
|
|
BUG_ON(ret); /* -ENOMEM */
|
|
|
|
if (root->root_key.objectid ==
|
|
BTRFS_DATA_RELOC_TREE_OBJECTID) {
|
|
ret = btrfs_reloc_clone_csums(inode, cur_offset,
|
|
num_bytes);
|
|
if (ret) {
|
|
if (!nolock && nocow)
|
|
btrfs_end_write_no_snapshoting(root);
|
|
goto error;
|
|
}
|
|
}
|
|
|
|
extent_clear_unlock_delalloc(inode, cur_offset,
|
|
cur_offset + num_bytes - 1, end,
|
|
locked_page, EXTENT_LOCKED |
|
|
EXTENT_DELALLOC |
|
|
EXTENT_CLEAR_DATA_RESV,
|
|
PAGE_UNLOCK | PAGE_SET_PRIVATE2);
|
|
|
|
if (!nolock && nocow)
|
|
btrfs_end_write_no_snapshoting(root);
|
|
cur_offset = extent_end;
|
|
if (cur_offset > end)
|
|
break;
|
|
}
|
|
btrfs_release_path(path);
|
|
|
|
if (cur_offset <= end && cow_start == (u64)-1) {
|
|
cow_start = cur_offset;
|
|
cur_offset = end;
|
|
}
|
|
|
|
if (cow_start != (u64)-1) {
|
|
ret = cow_file_range(inode, locked_page, cow_start, end, end,
|
|
page_started, nr_written, 1, NULL);
|
|
if (ret)
|
|
goto error;
|
|
}
|
|
|
|
error:
|
|
if (ret && cur_offset < end)
|
|
extent_clear_unlock_delalloc(inode, cur_offset, end, end,
|
|
locked_page, EXTENT_LOCKED |
|
|
EXTENT_DELALLOC | EXTENT_DEFRAG |
|
|
EXTENT_DO_ACCOUNTING, PAGE_UNLOCK |
|
|
PAGE_CLEAR_DIRTY |
|
|
PAGE_SET_WRITEBACK |
|
|
PAGE_END_WRITEBACK);
|
|
btrfs_free_path(path);
|
|
return ret;
|
|
}
|
|
|
|
static inline int need_force_cow(struct inode *inode, u64 start, u64 end)
|
|
{
|
|
|
|
if (!(BTRFS_I(inode)->flags & BTRFS_INODE_NODATACOW) &&
|
|
!(BTRFS_I(inode)->flags & BTRFS_INODE_PREALLOC))
|
|
return 0;
|
|
|
|
/*
|
|
* @defrag_bytes is a hint value, no spinlock held here,
|
|
* if is not zero, it means the file is defragging.
|
|
* Force cow if given extent needs to be defragged.
|
|
*/
|
|
if (BTRFS_I(inode)->defrag_bytes &&
|
|
test_range_bit(&BTRFS_I(inode)->io_tree, start, end,
|
|
EXTENT_DEFRAG, 0, NULL))
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* extent_io.c call back to do delayed allocation processing
|
|
*/
|
|
static int run_delalloc_range(struct inode *inode, struct page *locked_page,
|
|
u64 start, u64 end, int *page_started,
|
|
unsigned long *nr_written)
|
|
{
|
|
int ret;
|
|
int force_cow = need_force_cow(inode, start, end);
|
|
|
|
if (BTRFS_I(inode)->flags & BTRFS_INODE_NODATACOW && !force_cow) {
|
|
ret = run_delalloc_nocow(inode, locked_page, start, end,
|
|
page_started, 1, nr_written);
|
|
} else if (BTRFS_I(inode)->flags & BTRFS_INODE_PREALLOC && !force_cow) {
|
|
ret = run_delalloc_nocow(inode, locked_page, start, end,
|
|
page_started, 0, nr_written);
|
|
} else if (!inode_need_compress(inode)) {
|
|
ret = cow_file_range(inode, locked_page, start, end, end,
|
|
page_started, nr_written, 1, NULL);
|
|
} else {
|
|
set_bit(BTRFS_INODE_HAS_ASYNC_EXTENT,
|
|
&BTRFS_I(inode)->runtime_flags);
|
|
ret = cow_file_range_async(inode, locked_page, start, end,
|
|
page_started, nr_written);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static void btrfs_split_extent_hook(struct inode *inode,
|
|
struct extent_state *orig, u64 split)
|
|
{
|
|
u64 size;
|
|
|
|
/* not delalloc, ignore it */
|
|
if (!(orig->state & EXTENT_DELALLOC))
|
|
return;
|
|
|
|
size = orig->end - orig->start + 1;
|
|
if (size > BTRFS_MAX_EXTENT_SIZE) {
|
|
u32 num_extents;
|
|
u64 new_size;
|
|
|
|
/*
|
|
* See the explanation in btrfs_merge_extent_hook, the same
|
|
* applies here, just in reverse.
|
|
*/
|
|
new_size = orig->end - split + 1;
|
|
num_extents = count_max_extents(new_size);
|
|
new_size = split - orig->start;
|
|
num_extents += count_max_extents(new_size);
|
|
if (count_max_extents(size) >= num_extents)
|
|
return;
|
|
}
|
|
|
|
spin_lock(&BTRFS_I(inode)->lock);
|
|
BTRFS_I(inode)->outstanding_extents++;
|
|
spin_unlock(&BTRFS_I(inode)->lock);
|
|
}
|
|
|
|
/*
|
|
* extent_io.c merge_extent_hook, used to track merged delayed allocation
|
|
* extents so we can keep track of new extents that are just merged onto old
|
|
* extents, such as when we are doing sequential writes, so we can properly
|
|
* account for the metadata space we'll need.
|
|
*/
|
|
static void btrfs_merge_extent_hook(struct inode *inode,
|
|
struct extent_state *new,
|
|
struct extent_state *other)
|
|
{
|
|
u64 new_size, old_size;
|
|
u32 num_extents;
|
|
|
|
/* not delalloc, ignore it */
|
|
if (!(other->state & EXTENT_DELALLOC))
|
|
return;
|
|
|
|
if (new->start > other->start)
|
|
new_size = new->end - other->start + 1;
|
|
else
|
|
new_size = other->end - new->start + 1;
|
|
|
|
/* we're not bigger than the max, unreserve the space and go */
|
|
if (new_size <= BTRFS_MAX_EXTENT_SIZE) {
|
|
spin_lock(&BTRFS_I(inode)->lock);
|
|
BTRFS_I(inode)->outstanding_extents--;
|
|
spin_unlock(&BTRFS_I(inode)->lock);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* We have to add up either side to figure out how many extents were
|
|
* accounted for before we merged into one big extent. If the number of
|
|
* extents we accounted for is <= the amount we need for the new range
|
|
* then we can return, otherwise drop. Think of it like this
|
|
*
|
|
* [ 4k][MAX_SIZE]
|
|
*
|
|
* So we've grown the extent by a MAX_SIZE extent, this would mean we
|
|
* need 2 outstanding extents, on one side we have 1 and the other side
|
|
* we have 1 so they are == and we can return. But in this case
|
|
*
|
|
* [MAX_SIZE+4k][MAX_SIZE+4k]
|
|
*
|
|
* Each range on their own accounts for 2 extents, but merged together
|
|
* they are only 3 extents worth of accounting, so we need to drop in
|
|
* this case.
|
|
*/
|
|
old_size = other->end - other->start + 1;
|
|
num_extents = count_max_extents(old_size);
|
|
old_size = new->end - new->start + 1;
|
|
num_extents += count_max_extents(old_size);
|
|
if (count_max_extents(new_size) >= num_extents)
|
|
return;
|
|
|
|
spin_lock(&BTRFS_I(inode)->lock);
|
|
BTRFS_I(inode)->outstanding_extents--;
|
|
spin_unlock(&BTRFS_I(inode)->lock);
|
|
}
|
|
|
|
static void btrfs_add_delalloc_inodes(struct btrfs_root *root,
|
|
struct inode *inode)
|
|
{
|
|
struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
|
|
|
|
spin_lock(&root->delalloc_lock);
|
|
if (list_empty(&BTRFS_I(inode)->delalloc_inodes)) {
|
|
list_add_tail(&BTRFS_I(inode)->delalloc_inodes,
|
|
&root->delalloc_inodes);
|
|
set_bit(BTRFS_INODE_IN_DELALLOC_LIST,
|
|
&BTRFS_I(inode)->runtime_flags);
|
|
root->nr_delalloc_inodes++;
|
|
if (root->nr_delalloc_inodes == 1) {
|
|
spin_lock(&fs_info->delalloc_root_lock);
|
|
BUG_ON(!list_empty(&root->delalloc_root));
|
|
list_add_tail(&root->delalloc_root,
|
|
&fs_info->delalloc_roots);
|
|
spin_unlock(&fs_info->delalloc_root_lock);
|
|
}
|
|
}
|
|
spin_unlock(&root->delalloc_lock);
|
|
}
|
|
|
|
static void btrfs_del_delalloc_inode(struct btrfs_root *root,
|
|
struct inode *inode)
|
|
{
|
|
struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
|
|
|
|
spin_lock(&root->delalloc_lock);
|
|
if (!list_empty(&BTRFS_I(inode)->delalloc_inodes)) {
|
|
list_del_init(&BTRFS_I(inode)->delalloc_inodes);
|
|
clear_bit(BTRFS_INODE_IN_DELALLOC_LIST,
|
|
&BTRFS_I(inode)->runtime_flags);
|
|
root->nr_delalloc_inodes--;
|
|
if (!root->nr_delalloc_inodes) {
|
|
spin_lock(&fs_info->delalloc_root_lock);
|
|
BUG_ON(list_empty(&root->delalloc_root));
|
|
list_del_init(&root->delalloc_root);
|
|
spin_unlock(&fs_info->delalloc_root_lock);
|
|
}
|
|
}
|
|
spin_unlock(&root->delalloc_lock);
|
|
}
|
|
|
|
/*
|
|
* extent_io.c set_bit_hook, used to track delayed allocation
|
|
* bytes in this file, and to maintain the list of inodes that
|
|
* have pending delalloc work to be done.
|
|
*/
|
|
static void btrfs_set_bit_hook(struct inode *inode,
|
|
struct extent_state *state, unsigned *bits)
|
|
{
|
|
|
|
struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
|
|
|
|
if ((*bits & EXTENT_DEFRAG) && !(*bits & EXTENT_DELALLOC))
|
|
WARN_ON(1);
|
|
/*
|
|
* set_bit and clear bit hooks normally require _irqsave/restore
|
|
* but in this case, we are only testing for the DELALLOC
|
|
* bit, which is only set or cleared with irqs on
|
|
*/
|
|
if (!(state->state & EXTENT_DELALLOC) && (*bits & EXTENT_DELALLOC)) {
|
|
struct btrfs_root *root = BTRFS_I(inode)->root;
|
|
u64 len = state->end + 1 - state->start;
|
|
bool do_list = !btrfs_is_free_space_inode(BTRFS_I(inode));
|
|
|
|
if (*bits & EXTENT_FIRST_DELALLOC) {
|
|
*bits &= ~EXTENT_FIRST_DELALLOC;
|
|
} else {
|
|
spin_lock(&BTRFS_I(inode)->lock);
|
|
BTRFS_I(inode)->outstanding_extents++;
|
|
spin_unlock(&BTRFS_I(inode)->lock);
|
|
}
|
|
|
|
/* For sanity tests */
|
|
if (btrfs_is_testing(fs_info))
|
|
return;
|
|
|
|
__percpu_counter_add(&fs_info->delalloc_bytes, len,
|
|
fs_info->delalloc_batch);
|
|
spin_lock(&BTRFS_I(inode)->lock);
|
|
BTRFS_I(inode)->delalloc_bytes += len;
|
|
if (*bits & EXTENT_DEFRAG)
|
|
BTRFS_I(inode)->defrag_bytes += len;
|
|
if (do_list && !test_bit(BTRFS_INODE_IN_DELALLOC_LIST,
|
|
&BTRFS_I(inode)->runtime_flags))
|
|
btrfs_add_delalloc_inodes(root, inode);
|
|
spin_unlock(&BTRFS_I(inode)->lock);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* extent_io.c clear_bit_hook, see set_bit_hook for why
|
|
*/
|
|
static void btrfs_clear_bit_hook(struct inode *inode,
|
|
struct extent_state *state,
|
|
unsigned *bits)
|
|
{
|
|
struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
|
|
u64 len = state->end + 1 - state->start;
|
|
u32 num_extents = count_max_extents(len);
|
|
|
|
spin_lock(&BTRFS_I(inode)->lock);
|
|
if ((state->state & EXTENT_DEFRAG) && (*bits & EXTENT_DEFRAG))
|
|
BTRFS_I(inode)->defrag_bytes -= len;
|
|
spin_unlock(&BTRFS_I(inode)->lock);
|
|
|
|
/*
|
|
* set_bit and clear bit hooks normally require _irqsave/restore
|
|
* but in this case, we are only testing for the DELALLOC
|
|
* bit, which is only set or cleared with irqs on
|
|
*/
|
|
if ((state->state & EXTENT_DELALLOC) && (*bits & EXTENT_DELALLOC)) {
|
|
struct btrfs_root *root = BTRFS_I(inode)->root;
|
|
bool do_list = !btrfs_is_free_space_inode(BTRFS_I(inode));
|
|
|
|
if (*bits & EXTENT_FIRST_DELALLOC) {
|
|
*bits &= ~EXTENT_FIRST_DELALLOC;
|
|
} else if (!(*bits & EXTENT_DO_ACCOUNTING)) {
|
|
spin_lock(&BTRFS_I(inode)->lock);
|
|
BTRFS_I(inode)->outstanding_extents -= num_extents;
|
|
spin_unlock(&BTRFS_I(inode)->lock);
|
|
}
|
|
|
|
/*
|
|
* We don't reserve metadata space for space cache inodes so we
|
|
* don't need to call dellalloc_release_metadata if there is an
|
|
* error.
|
|
*/
|
|
if (*bits & EXTENT_DO_ACCOUNTING &&
|
|
root != fs_info->tree_root)
|
|
btrfs_delalloc_release_metadata(BTRFS_I(inode), len);
|
|
|
|
/* For sanity tests. */
|
|
if (btrfs_is_testing(fs_info))
|
|
return;
|
|
|
|
if (root->root_key.objectid != BTRFS_DATA_RELOC_TREE_OBJECTID
|
|
&& do_list && !(state->state & EXTENT_NORESERVE)
|
|
&& (*bits & (EXTENT_DO_ACCOUNTING |
|
|
EXTENT_CLEAR_DATA_RESV)))
|
|
btrfs_free_reserved_data_space_noquota(inode,
|
|
state->start, len);
|
|
|
|
__percpu_counter_add(&fs_info->delalloc_bytes, -len,
|
|
fs_info->delalloc_batch);
|
|
spin_lock(&BTRFS_I(inode)->lock);
|
|
BTRFS_I(inode)->delalloc_bytes -= len;
|
|
if (do_list && BTRFS_I(inode)->delalloc_bytes == 0 &&
|
|
test_bit(BTRFS_INODE_IN_DELALLOC_LIST,
|
|
&BTRFS_I(inode)->runtime_flags))
|
|
btrfs_del_delalloc_inode(root, inode);
|
|
spin_unlock(&BTRFS_I(inode)->lock);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* extent_io.c merge_bio_hook, this must check the chunk tree to make sure
|
|
* we don't create bios that span stripes or chunks
|
|
*
|
|
* return 1 if page cannot be merged to bio
|
|
* return 0 if page can be merged to bio
|
|
* return error otherwise
|
|
*/
|
|
int btrfs_merge_bio_hook(struct page *page, unsigned long offset,
|
|
size_t size, struct bio *bio,
|
|
unsigned long bio_flags)
|
|
{
|
|
struct inode *inode = page->mapping->host;
|
|
struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
|
|
u64 logical = (u64)bio->bi_iter.bi_sector << 9;
|
|
u64 length = 0;
|
|
u64 map_length;
|
|
int ret;
|
|
|
|
if (bio_flags & EXTENT_BIO_COMPRESSED)
|
|
return 0;
|
|
|
|
length = bio->bi_iter.bi_size;
|
|
map_length = length;
|
|
ret = btrfs_map_block(fs_info, btrfs_op(bio), logical, &map_length,
|
|
NULL, 0);
|
|
if (ret < 0)
|
|
return ret;
|
|
if (map_length < length + size)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* in order to insert checksums into the metadata in large chunks,
|
|
* we wait until bio submission time. All the pages in the bio are
|
|
* checksummed and sums are attached onto the ordered extent record.
|
|
*
|
|
* At IO completion time the cums attached on the ordered extent record
|
|
* are inserted into the btree
|
|
*/
|
|
static int __btrfs_submit_bio_start(struct inode *inode, struct bio *bio,
|
|
int mirror_num, unsigned long bio_flags,
|
|
u64 bio_offset)
|
|
{
|
|
int ret = 0;
|
|
|
|
ret = btrfs_csum_one_bio(inode, bio, 0, 0);
|
|
BUG_ON(ret); /* -ENOMEM */
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* in order to insert checksums into the metadata in large chunks,
|
|
* we wait until bio submission time. All the pages in the bio are
|
|
* checksummed and sums are attached onto the ordered extent record.
|
|
*
|
|
* At IO completion time the cums attached on the ordered extent record
|
|
* are inserted into the btree
|
|
*/
|
|
static int __btrfs_submit_bio_done(struct inode *inode, struct bio *bio,
|
|
int mirror_num, unsigned long bio_flags,
|
|
u64 bio_offset)
|
|
{
|
|
struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
|
|
int ret;
|
|
|
|
ret = btrfs_map_bio(fs_info, bio, mirror_num, 1);
|
|
if (ret) {
|
|
bio->bi_error = ret;
|
|
bio_endio(bio);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* extent_io.c submission hook. This does the right thing for csum calculation
|
|
* on write, or reading the csums from the tree before a read
|
|
*/
|
|
static int btrfs_submit_bio_hook(struct inode *inode, struct bio *bio,
|
|
int mirror_num, unsigned long bio_flags,
|
|
u64 bio_offset)
|
|
{
|
|
struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
|
|
struct btrfs_root *root = BTRFS_I(inode)->root;
|
|
enum btrfs_wq_endio_type metadata = BTRFS_WQ_ENDIO_DATA;
|
|
int ret = 0;
|
|
int skip_sum;
|
|
int async = !atomic_read(&BTRFS_I(inode)->sync_writers);
|
|
|
|
skip_sum = BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM;
|
|
|
|
if (btrfs_is_free_space_inode(BTRFS_I(inode)))
|
|
metadata = BTRFS_WQ_ENDIO_FREE_SPACE;
|
|
|
|
if (bio_op(bio) != REQ_OP_WRITE) {
|
|
ret = btrfs_bio_wq_end_io(fs_info, bio, metadata);
|
|
if (ret)
|
|
goto out;
|
|
|
|
if (bio_flags & EXTENT_BIO_COMPRESSED) {
|
|
ret = btrfs_submit_compressed_read(inode, bio,
|
|
mirror_num,
|
|
bio_flags);
|
|
goto out;
|
|
} else if (!skip_sum) {
|
|
ret = btrfs_lookup_bio_sums(inode, bio, NULL);
|
|
if (ret)
|
|
goto out;
|
|
}
|
|
goto mapit;
|
|
} else if (async && !skip_sum) {
|
|
/* csum items have already been cloned */
|
|
if (root->root_key.objectid == BTRFS_DATA_RELOC_TREE_OBJECTID)
|
|
goto mapit;
|
|
/* we're doing a write, do the async checksumming */
|
|
ret = btrfs_wq_submit_bio(fs_info, inode, bio, mirror_num,
|
|
bio_flags, bio_offset,
|
|
__btrfs_submit_bio_start,
|
|
__btrfs_submit_bio_done);
|
|
goto out;
|
|
} else if (!skip_sum) {
|
|
ret = btrfs_csum_one_bio(inode, bio, 0, 0);
|
|
if (ret)
|
|
goto out;
|
|
}
|
|
|
|
mapit:
|
|
ret = btrfs_map_bio(fs_info, bio, mirror_num, 0);
|
|
|
|
out:
|
|
if (ret < 0) {
|
|
bio->bi_error = ret;
|
|
bio_endio(bio);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* given a list of ordered sums record them in the inode. This happens
|
|
* at IO completion time based on sums calculated at bio submission time.
|
|
*/
|
|
static noinline int add_pending_csums(struct btrfs_trans_handle *trans,
|
|
struct inode *inode, struct list_head *list)
|
|
{
|
|
struct btrfs_ordered_sum *sum;
|
|
|
|
list_for_each_entry(sum, list, list) {
|
|
trans->adding_csums = 1;
|
|
btrfs_csum_file_blocks(trans,
|
|
BTRFS_I(inode)->root->fs_info->csum_root, sum);
|
|
trans->adding_csums = 0;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int btrfs_set_extent_delalloc(struct inode *inode, u64 start, u64 end,
|
|
struct extent_state **cached_state, int dedupe)
|
|
{
|
|
WARN_ON((end & (PAGE_SIZE - 1)) == 0);
|
|
return set_extent_delalloc(&BTRFS_I(inode)->io_tree, start, end,
|
|
cached_state);
|
|
}
|
|
|
|
/* see btrfs_writepage_start_hook for details on why this is required */
|
|
struct btrfs_writepage_fixup {
|
|
struct page *page;
|
|
struct btrfs_work work;
|
|
};
|
|
|
|
static void btrfs_writepage_fixup_worker(struct btrfs_work *work)
|
|
{
|
|
struct btrfs_writepage_fixup *fixup;
|
|
struct btrfs_ordered_extent *ordered;
|
|
struct extent_state *cached_state = NULL;
|
|
struct page *page;
|
|
struct inode *inode;
|
|
u64 page_start;
|
|
u64 page_end;
|
|
int ret;
|
|
|
|
fixup = container_of(work, struct btrfs_writepage_fixup, work);
|
|
page = fixup->page;
|
|
again:
|
|
lock_page(page);
|
|
if (!page->mapping || !PageDirty(page) || !PageChecked(page)) {
|
|
ClearPageChecked(page);
|
|
goto out_page;
|
|
}
|
|
|
|
inode = page->mapping->host;
|
|
page_start = page_offset(page);
|
|
page_end = page_offset(page) + PAGE_SIZE - 1;
|
|
|
|
lock_extent_bits(&BTRFS_I(inode)->io_tree, page_start, page_end,
|
|
&cached_state);
|
|
|
|
/* already ordered? We're done */
|
|
if (PagePrivate2(page))
|
|
goto out;
|
|
|
|
ordered = btrfs_lookup_ordered_range(BTRFS_I(inode), page_start,
|
|
PAGE_SIZE);
|
|
if (ordered) {
|
|
unlock_extent_cached(&BTRFS_I(inode)->io_tree, page_start,
|
|
page_end, &cached_state, GFP_NOFS);
|
|
unlock_page(page);
|
|
btrfs_start_ordered_extent(inode, ordered, 1);
|
|
btrfs_put_ordered_extent(ordered);
|
|
goto again;
|
|
}
|
|
|
|
ret = btrfs_delalloc_reserve_space(inode, page_start,
|
|
PAGE_SIZE);
|
|
if (ret) {
|
|
mapping_set_error(page->mapping, ret);
|
|
end_extent_writepage(page, ret, page_start, page_end);
|
|
ClearPageChecked(page);
|
|
goto out;
|
|
}
|
|
|
|
btrfs_set_extent_delalloc(inode, page_start, page_end, &cached_state,
|
|
0);
|
|
ClearPageChecked(page);
|
|
set_page_dirty(page);
|
|
out:
|
|
unlock_extent_cached(&BTRFS_I(inode)->io_tree, page_start, page_end,
|
|
&cached_state, GFP_NOFS);
|
|
out_page:
|
|
unlock_page(page);
|
|
put_page(page);
|
|
kfree(fixup);
|
|
}
|
|
|
|
/*
|
|
* There are a few paths in the higher layers of the kernel that directly
|
|
* set the page dirty bit without asking the filesystem if it is a
|
|
* good idea. This causes problems because we want to make sure COW
|
|
* properly happens and the data=ordered rules are followed.
|
|
*
|
|
* In our case any range that doesn't have the ORDERED bit set
|
|
* hasn't been properly setup for IO. We kick off an async process
|
|
* to fix it up. The async helper will wait for ordered extents, set
|
|
* the delalloc bit and make it safe to write the page.
|
|
*/
|
|
static int btrfs_writepage_start_hook(struct page *page, u64 start, u64 end)
|
|
{
|
|
struct inode *inode = page->mapping->host;
|
|
struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
|
|
struct btrfs_writepage_fixup *fixup;
|
|
|
|
/* this page is properly in the ordered list */
|
|
if (TestClearPagePrivate2(page))
|
|
return 0;
|
|
|
|
if (PageChecked(page))
|
|
return -EAGAIN;
|
|
|
|
fixup = kzalloc(sizeof(*fixup), GFP_NOFS);
|
|
if (!fixup)
|
|
return -EAGAIN;
|
|
|
|
SetPageChecked(page);
|
|
get_page(page);
|
|
btrfs_init_work(&fixup->work, btrfs_fixup_helper,
|
|
btrfs_writepage_fixup_worker, NULL, NULL);
|
|
fixup->page = page;
|
|
btrfs_queue_work(fs_info->fixup_workers, &fixup->work);
|
|
return -EBUSY;
|
|
}
|
|
|
|
static int insert_reserved_file_extent(struct btrfs_trans_handle *trans,
|
|
struct inode *inode, u64 file_pos,
|
|
u64 disk_bytenr, u64 disk_num_bytes,
|
|
u64 num_bytes, u64 ram_bytes,
|
|
u8 compression, u8 encryption,
|
|
u16 other_encoding, int extent_type)
|
|
{
|
|
struct btrfs_root *root = BTRFS_I(inode)->root;
|
|
struct btrfs_file_extent_item *fi;
|
|
struct btrfs_path *path;
|
|
struct extent_buffer *leaf;
|
|
struct btrfs_key ins;
|
|
int extent_inserted = 0;
|
|
int ret;
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
|
|
/*
|
|
* we may be replacing one extent in the tree with another.
|
|
* The new extent is pinned in the extent map, and we don't want
|
|
* to drop it from the cache until it is completely in the btree.
|
|
*
|
|
* So, tell btrfs_drop_extents to leave this extent in the cache.
|
|
* the caller is expected to unpin it and allow it to be merged
|
|
* with the others.
|
|
*/
|
|
ret = __btrfs_drop_extents(trans, root, inode, path, file_pos,
|
|
file_pos + num_bytes, NULL, 0,
|
|
1, sizeof(*fi), &extent_inserted);
|
|
if (ret)
|
|
goto out;
|
|
|
|
if (!extent_inserted) {
|
|
ins.objectid = btrfs_ino(BTRFS_I(inode));
|
|
ins.offset = file_pos;
|
|
ins.type = BTRFS_EXTENT_DATA_KEY;
|
|
|
|
path->leave_spinning = 1;
|
|
ret = btrfs_insert_empty_item(trans, root, path, &ins,
|
|
sizeof(*fi));
|
|
if (ret)
|
|
goto out;
|
|
}
|
|
leaf = path->nodes[0];
|
|
fi = btrfs_item_ptr(leaf, path->slots[0],
|
|
struct btrfs_file_extent_item);
|
|
btrfs_set_file_extent_generation(leaf, fi, trans->transid);
|
|
btrfs_set_file_extent_type(leaf, fi, extent_type);
|
|
btrfs_set_file_extent_disk_bytenr(leaf, fi, disk_bytenr);
|
|
btrfs_set_file_extent_disk_num_bytes(leaf, fi, disk_num_bytes);
|
|
btrfs_set_file_extent_offset(leaf, fi, 0);
|
|
btrfs_set_file_extent_num_bytes(leaf, fi, num_bytes);
|
|
btrfs_set_file_extent_ram_bytes(leaf, fi, ram_bytes);
|
|
btrfs_set_file_extent_compression(leaf, fi, compression);
|
|
btrfs_set_file_extent_encryption(leaf, fi, encryption);
|
|
btrfs_set_file_extent_other_encoding(leaf, fi, other_encoding);
|
|
|
|
btrfs_mark_buffer_dirty(leaf);
|
|
btrfs_release_path(path);
|
|
|
|
inode_add_bytes(inode, num_bytes);
|
|
|
|
ins.objectid = disk_bytenr;
|
|
ins.offset = disk_num_bytes;
|
|
ins.type = BTRFS_EXTENT_ITEM_KEY;
|
|
ret = btrfs_alloc_reserved_file_extent(trans, root->root_key.objectid,
|
|
btrfs_ino(BTRFS_I(inode)), file_pos, ram_bytes, &ins);
|
|
/*
|
|
* Release the reserved range from inode dirty range map, as it is
|
|
* already moved into delayed_ref_head
|
|
*/
|
|
btrfs_qgroup_release_data(inode, file_pos, ram_bytes);
|
|
out:
|
|
btrfs_free_path(path);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* snapshot-aware defrag */
|
|
struct sa_defrag_extent_backref {
|
|
struct rb_node node;
|
|
struct old_sa_defrag_extent *old;
|
|
u64 root_id;
|
|
u64 inum;
|
|
u64 file_pos;
|
|
u64 extent_offset;
|
|
u64 num_bytes;
|
|
u64 generation;
|
|
};
|
|
|
|
struct old_sa_defrag_extent {
|
|
struct list_head list;
|
|
struct new_sa_defrag_extent *new;
|
|
|
|
u64 extent_offset;
|
|
u64 bytenr;
|
|
u64 offset;
|
|
u64 len;
|
|
int count;
|
|
};
|
|
|
|
struct new_sa_defrag_extent {
|
|
struct rb_root root;
|
|
struct list_head head;
|
|
struct btrfs_path *path;
|
|
struct inode *inode;
|
|
u64 file_pos;
|
|
u64 len;
|
|
u64 bytenr;
|
|
u64 disk_len;
|
|
u8 compress_type;
|
|
};
|
|
|
|
static int backref_comp(struct sa_defrag_extent_backref *b1,
|
|
struct sa_defrag_extent_backref *b2)
|
|
{
|
|
if (b1->root_id < b2->root_id)
|
|
return -1;
|
|
else if (b1->root_id > b2->root_id)
|
|
return 1;
|
|
|
|
if (b1->inum < b2->inum)
|
|
return -1;
|
|
else if (b1->inum > b2->inum)
|
|
return 1;
|
|
|
|
if (b1->file_pos < b2->file_pos)
|
|
return -1;
|
|
else if (b1->file_pos > b2->file_pos)
|
|
return 1;
|
|
|
|
/*
|
|
* [------------------------------] ===> (a range of space)
|
|
* |<--->| |<---->| =============> (fs/file tree A)
|
|
* |<---------------------------->| ===> (fs/file tree B)
|
|
*
|
|
* A range of space can refer to two file extents in one tree while
|
|
* refer to only one file extent in another tree.
|
|
*
|
|
* So we may process a disk offset more than one time(two extents in A)
|
|
* and locate at the same extent(one extent in B), then insert two same
|
|
* backrefs(both refer to the extent in B).
|
|
*/
|
|
return 0;
|
|
}
|
|
|
|
static void backref_insert(struct rb_root *root,
|
|
struct sa_defrag_extent_backref *backref)
|
|
{
|
|
struct rb_node **p = &root->rb_node;
|
|
struct rb_node *parent = NULL;
|
|
struct sa_defrag_extent_backref *entry;
|
|
int ret;
|
|
|
|
while (*p) {
|
|
parent = *p;
|
|
entry = rb_entry(parent, struct sa_defrag_extent_backref, node);
|
|
|
|
ret = backref_comp(backref, entry);
|
|
if (ret < 0)
|
|
p = &(*p)->rb_left;
|
|
else
|
|
p = &(*p)->rb_right;
|
|
}
|
|
|
|
rb_link_node(&backref->node, parent, p);
|
|
rb_insert_color(&backref->node, root);
|
|
}
|
|
|
|
/*
|
|
* Note the backref might has changed, and in this case we just return 0.
|
|
*/
|
|
static noinline int record_one_backref(u64 inum, u64 offset, u64 root_id,
|
|
void *ctx)
|
|
{
|
|
struct btrfs_file_extent_item *extent;
|
|
struct old_sa_defrag_extent *old = ctx;
|
|
struct new_sa_defrag_extent *new = old->new;
|
|
struct btrfs_path *path = new->path;
|
|
struct btrfs_key key;
|
|
struct btrfs_root *root;
|
|
struct sa_defrag_extent_backref *backref;
|
|
struct extent_buffer *leaf;
|
|
struct inode *inode = new->inode;
|
|
struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
|
|
int slot;
|
|
int ret;
|
|
u64 extent_offset;
|
|
u64 num_bytes;
|
|
|
|
if (BTRFS_I(inode)->root->root_key.objectid == root_id &&
|
|
inum == btrfs_ino(BTRFS_I(inode)))
|
|
return 0;
|
|
|
|
key.objectid = root_id;
|
|
key.type = BTRFS_ROOT_ITEM_KEY;
|
|
key.offset = (u64)-1;
|
|
|
|
root = btrfs_read_fs_root_no_name(fs_info, &key);
|
|
if (IS_ERR(root)) {
|
|
if (PTR_ERR(root) == -ENOENT)
|
|
return 0;
|
|
WARN_ON(1);
|
|
btrfs_debug(fs_info, "inum=%llu, offset=%llu, root_id=%llu",
|
|
inum, offset, root_id);
|
|
return PTR_ERR(root);
|
|
}
|
|
|
|
key.objectid = inum;
|
|
key.type = BTRFS_EXTENT_DATA_KEY;
|
|
if (offset > (u64)-1 << 32)
|
|
key.offset = 0;
|
|
else
|
|
key.offset = offset;
|
|
|
|
ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
|
|
if (WARN_ON(ret < 0))
|
|
return ret;
|
|
ret = 0;
|
|
|
|
while (1) {
|
|
cond_resched();
|
|
|
|
leaf = path->nodes[0];
|
|
slot = path->slots[0];
|
|
|
|
if (slot >= btrfs_header_nritems(leaf)) {
|
|
ret = btrfs_next_leaf(root, path);
|
|
if (ret < 0) {
|
|
goto out;
|
|
} else if (ret > 0) {
|
|
ret = 0;
|
|
goto out;
|
|
}
|
|
continue;
|
|
}
|
|
|
|
path->slots[0]++;
|
|
|
|
btrfs_item_key_to_cpu(leaf, &key, slot);
|
|
|
|
if (key.objectid > inum)
|
|
goto out;
|
|
|
|
if (key.objectid < inum || key.type != BTRFS_EXTENT_DATA_KEY)
|
|
continue;
|
|
|
|
extent = btrfs_item_ptr(leaf, slot,
|
|
struct btrfs_file_extent_item);
|
|
|
|
if (btrfs_file_extent_disk_bytenr(leaf, extent) != old->bytenr)
|
|
continue;
|
|
|
|
/*
|
|
* 'offset' refers to the exact key.offset,
|
|
* NOT the 'offset' field in btrfs_extent_data_ref, ie.
|
|
* (key.offset - extent_offset).
|
|
*/
|
|
if (key.offset != offset)
|
|
continue;
|
|
|
|
extent_offset = btrfs_file_extent_offset(leaf, extent);
|
|
num_bytes = btrfs_file_extent_num_bytes(leaf, extent);
|
|
|
|
if (extent_offset >= old->extent_offset + old->offset +
|
|
old->len || extent_offset + num_bytes <=
|
|
old->extent_offset + old->offset)
|
|
continue;
|
|
break;
|
|
}
|
|
|
|
backref = kmalloc(sizeof(*backref), GFP_NOFS);
|
|
if (!backref) {
|
|
ret = -ENOENT;
|
|
goto out;
|
|
}
|
|
|
|
backref->root_id = root_id;
|
|
backref->inum = inum;
|
|
backref->file_pos = offset;
|
|
backref->num_bytes = num_bytes;
|
|
backref->extent_offset = extent_offset;
|
|
backref->generation = btrfs_file_extent_generation(leaf, extent);
|
|
backref->old = old;
|
|
backref_insert(&new->root, backref);
|
|
old->count++;
|
|
out:
|
|
btrfs_release_path(path);
|
|
WARN_ON(ret);
|
|
return ret;
|
|
}
|
|
|
|
static noinline bool record_extent_backrefs(struct btrfs_path *path,
|
|
struct new_sa_defrag_extent *new)
|
|
{
|
|
struct btrfs_fs_info *fs_info = btrfs_sb(new->inode->i_sb);
|
|
struct old_sa_defrag_extent *old, *tmp;
|
|
int ret;
|
|
|
|
new->path = path;
|
|
|
|
list_for_each_entry_safe(old, tmp, &new->head, list) {
|
|
ret = iterate_inodes_from_logical(old->bytenr +
|
|
old->extent_offset, fs_info,
|
|
path, record_one_backref,
|
|
old);
|
|
if (ret < 0 && ret != -ENOENT)
|
|
return false;
|
|
|
|
/* no backref to be processed for this extent */
|
|
if (!old->count) {
|
|
list_del(&old->list);
|
|
kfree(old);
|
|
}
|
|
}
|
|
|
|
if (list_empty(&new->head))
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
static int relink_is_mergable(struct extent_buffer *leaf,
|
|
struct btrfs_file_extent_item *fi,
|
|
struct new_sa_defrag_extent *new)
|
|
{
|
|
if (btrfs_file_extent_disk_bytenr(leaf, fi) != new->bytenr)
|
|
return 0;
|
|
|
|
if (btrfs_file_extent_type(leaf, fi) != BTRFS_FILE_EXTENT_REG)
|
|
return 0;
|
|
|
|
if (btrfs_file_extent_compression(leaf, fi) != new->compress_type)
|
|
return 0;
|
|
|
|
if (btrfs_file_extent_encryption(leaf, fi) ||
|
|
btrfs_file_extent_other_encoding(leaf, fi))
|
|
return 0;
|
|
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Note the backref might has changed, and in this case we just return 0.
|
|
*/
|
|
static noinline int relink_extent_backref(struct btrfs_path *path,
|
|
struct sa_defrag_extent_backref *prev,
|
|
struct sa_defrag_extent_backref *backref)
|
|
{
|
|
struct btrfs_file_extent_item *extent;
|
|
struct btrfs_file_extent_item *item;
|
|
struct btrfs_ordered_extent *ordered;
|
|
struct btrfs_trans_handle *trans;
|
|
struct btrfs_root *root;
|
|
struct btrfs_key key;
|
|
struct extent_buffer *leaf;
|
|
struct old_sa_defrag_extent *old = backref->old;
|
|
struct new_sa_defrag_extent *new = old->new;
|
|
struct btrfs_fs_info *fs_info = btrfs_sb(new->inode->i_sb);
|
|
struct inode *inode;
|
|
struct extent_state *cached = NULL;
|
|
int ret = 0;
|
|
u64 start;
|
|
u64 len;
|
|
u64 lock_start;
|
|
u64 lock_end;
|
|
bool merge = false;
|
|
int index;
|
|
|
|
if (prev && prev->root_id == backref->root_id &&
|
|
prev->inum == backref->inum &&
|
|
prev->file_pos + prev->num_bytes == backref->file_pos)
|
|
merge = true;
|
|
|
|
/* step 1: get root */
|
|
key.objectid = backref->root_id;
|
|
key.type = BTRFS_ROOT_ITEM_KEY;
|
|
key.offset = (u64)-1;
|
|
|
|
index = srcu_read_lock(&fs_info->subvol_srcu);
|
|
|
|
root = btrfs_read_fs_root_no_name(fs_info, &key);
|
|
if (IS_ERR(root)) {
|
|
srcu_read_unlock(&fs_info->subvol_srcu, index);
|
|
if (PTR_ERR(root) == -ENOENT)
|
|
return 0;
|
|
return PTR_ERR(root);
|
|
}
|
|
|
|
if (btrfs_root_readonly(root)) {
|
|
srcu_read_unlock(&fs_info->subvol_srcu, index);
|
|
return 0;
|
|
}
|
|
|
|
/* step 2: get inode */
|
|
key.objectid = backref->inum;
|
|
key.type = BTRFS_INODE_ITEM_KEY;
|
|
key.offset = 0;
|
|
|
|
inode = btrfs_iget(fs_info->sb, &key, root, NULL);
|
|
if (IS_ERR(inode)) {
|
|
srcu_read_unlock(&fs_info->subvol_srcu, index);
|
|
return 0;
|
|
}
|
|
|
|
srcu_read_unlock(&fs_info->subvol_srcu, index);
|
|
|
|
/* step 3: relink backref */
|
|
lock_start = backref->file_pos;
|
|
lock_end = backref->file_pos + backref->num_bytes - 1;
|
|
lock_extent_bits(&BTRFS_I(inode)->io_tree, lock_start, lock_end,
|
|
&cached);
|
|
|
|
ordered = btrfs_lookup_first_ordered_extent(inode, lock_end);
|
|
if (ordered) {
|
|
btrfs_put_ordered_extent(ordered);
|
|
goto out_unlock;
|
|
}
|
|
|
|
trans = btrfs_join_transaction(root);
|
|
if (IS_ERR(trans)) {
|
|
ret = PTR_ERR(trans);
|
|
goto out_unlock;
|
|
}
|
|
|
|
key.objectid = backref->inum;
|
|
key.type = BTRFS_EXTENT_DATA_KEY;
|
|
key.offset = backref->file_pos;
|
|
|
|
ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
|
|
if (ret < 0) {
|
|
goto out_free_path;
|
|
} else if (ret > 0) {
|
|
ret = 0;
|
|
goto out_free_path;
|
|
}
|
|
|
|
extent = btrfs_item_ptr(path->nodes[0], path->slots[0],
|
|
struct btrfs_file_extent_item);
|
|
|
|
if (btrfs_file_extent_generation(path->nodes[0], extent) !=
|
|
backref->generation)
|
|
goto out_free_path;
|
|
|
|
btrfs_release_path(path);
|
|
|
|
start = backref->file_pos;
|
|
if (backref->extent_offset < old->extent_offset + old->offset)
|
|
start += old->extent_offset + old->offset -
|
|
backref->extent_offset;
|
|
|
|
len = min(backref->extent_offset + backref->num_bytes,
|
|
old->extent_offset + old->offset + old->len);
|
|
len -= max(backref->extent_offset, old->extent_offset + old->offset);
|
|
|
|
ret = btrfs_drop_extents(trans, root, inode, start,
|
|
start + len, 1);
|
|
if (ret)
|
|
goto out_free_path;
|
|
again:
|
|
key.objectid = btrfs_ino(BTRFS_I(inode));
|
|
key.type = BTRFS_EXTENT_DATA_KEY;
|
|
key.offset = start;
|
|
|
|
path->leave_spinning = 1;
|
|
if (merge) {
|
|
struct btrfs_file_extent_item *fi;
|
|
u64 extent_len;
|
|
struct btrfs_key found_key;
|
|
|
|
ret = btrfs_search_slot(trans, root, &key, path, 0, 1);
|
|
if (ret < 0)
|
|
goto out_free_path;
|
|
|
|
path->slots[0]--;
|
|
leaf = path->nodes[0];
|
|
btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
|
|
|
|
fi = btrfs_item_ptr(leaf, path->slots[0],
|
|
struct btrfs_file_extent_item);
|
|
extent_len = btrfs_file_extent_num_bytes(leaf, fi);
|
|
|
|
if (extent_len + found_key.offset == start &&
|
|
relink_is_mergable(leaf, fi, new)) {
|
|
btrfs_set_file_extent_num_bytes(leaf, fi,
|
|
extent_len + len);
|
|
btrfs_mark_buffer_dirty(leaf);
|
|
inode_add_bytes(inode, len);
|
|
|
|
ret = 1;
|
|
goto out_free_path;
|
|
} else {
|
|
merge = false;
|
|
btrfs_release_path(path);
|
|
goto again;
|
|
}
|
|
}
|
|
|
|
ret = btrfs_insert_empty_item(trans, root, path, &key,
|
|
sizeof(*extent));
|
|
if (ret) {
|
|
btrfs_abort_transaction(trans, ret);
|
|
goto out_free_path;
|
|
}
|
|
|
|
leaf = path->nodes[0];
|
|
item = btrfs_item_ptr(leaf, path->slots[0],
|
|
struct btrfs_file_extent_item);
|
|
btrfs_set_file_extent_disk_bytenr(leaf, item, new->bytenr);
|
|
btrfs_set_file_extent_disk_num_bytes(leaf, item, new->disk_len);
|
|
btrfs_set_file_extent_offset(leaf, item, start - new->file_pos);
|
|
btrfs_set_file_extent_num_bytes(leaf, item, len);
|
|
btrfs_set_file_extent_ram_bytes(leaf, item, new->len);
|
|
btrfs_set_file_extent_generation(leaf, item, trans->transid);
|
|
btrfs_set_file_extent_type(leaf, item, BTRFS_FILE_EXTENT_REG);
|
|
btrfs_set_file_extent_compression(leaf, item, new->compress_type);
|
|
btrfs_set_file_extent_encryption(leaf, item, 0);
|
|
btrfs_set_file_extent_other_encoding(leaf, item, 0);
|
|
|
|
btrfs_mark_buffer_dirty(leaf);
|
|
inode_add_bytes(inode, len);
|
|
btrfs_release_path(path);
|
|
|
|
ret = btrfs_inc_extent_ref(trans, fs_info, new->bytenr,
|
|
new->disk_len, 0,
|
|
backref->root_id, backref->inum,
|
|
new->file_pos); /* start - extent_offset */
|
|
if (ret) {
|
|
btrfs_abort_transaction(trans, ret);
|
|
goto out_free_path;
|
|
}
|
|
|
|
ret = 1;
|
|
out_free_path:
|
|
btrfs_release_path(path);
|
|
path->leave_spinning = 0;
|
|
btrfs_end_transaction(trans);
|
|
out_unlock:
|
|
unlock_extent_cached(&BTRFS_I(inode)->io_tree, lock_start, lock_end,
|
|
&cached, GFP_NOFS);
|
|
iput(inode);
|
|
return ret;
|
|
}
|
|
|
|
static void free_sa_defrag_extent(struct new_sa_defrag_extent *new)
|
|
{
|
|
struct old_sa_defrag_extent *old, *tmp;
|
|
|
|
if (!new)
|
|
return;
|
|
|
|
list_for_each_entry_safe(old, tmp, &new->head, list) {
|
|
kfree(old);
|
|
}
|
|
kfree(new);
|
|
}
|
|
|
|
static void relink_file_extents(struct new_sa_defrag_extent *new)
|
|
{
|
|
struct btrfs_fs_info *fs_info = btrfs_sb(new->inode->i_sb);
|
|
struct btrfs_path *path;
|
|
struct sa_defrag_extent_backref *backref;
|
|
struct sa_defrag_extent_backref *prev = NULL;
|
|
struct inode *inode;
|
|
struct btrfs_root *root;
|
|
struct rb_node *node;
|
|
int ret;
|
|
|
|
inode = new->inode;
|
|
root = BTRFS_I(inode)->root;
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
return;
|
|
|
|
if (!record_extent_backrefs(path, new)) {
|
|
btrfs_free_path(path);
|
|
goto out;
|
|
}
|
|
btrfs_release_path(path);
|
|
|
|
while (1) {
|
|
node = rb_first(&new->root);
|
|
if (!node)
|
|
break;
|
|
rb_erase(node, &new->root);
|
|
|
|
backref = rb_entry(node, struct sa_defrag_extent_backref, node);
|
|
|
|
ret = relink_extent_backref(path, prev, backref);
|
|
WARN_ON(ret < 0);
|
|
|
|
kfree(prev);
|
|
|
|
if (ret == 1)
|
|
prev = backref;
|
|
else
|
|
prev = NULL;
|
|
cond_resched();
|
|
}
|
|
kfree(prev);
|
|
|
|
btrfs_free_path(path);
|
|
out:
|
|
free_sa_defrag_extent(new);
|
|
|
|
atomic_dec(&fs_info->defrag_running);
|
|
wake_up(&fs_info->transaction_wait);
|
|
}
|
|
|
|
static struct new_sa_defrag_extent *
|
|
record_old_file_extents(struct inode *inode,
|
|
struct btrfs_ordered_extent *ordered)
|
|
{
|
|
struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
|
|
struct btrfs_root *root = BTRFS_I(inode)->root;
|
|
struct btrfs_path *path;
|
|
struct btrfs_key key;
|
|
struct old_sa_defrag_extent *old;
|
|
struct new_sa_defrag_extent *new;
|
|
int ret;
|
|
|
|
new = kmalloc(sizeof(*new), GFP_NOFS);
|
|
if (!new)
|
|
return NULL;
|
|
|
|
new->inode = inode;
|
|
new->file_pos = ordered->file_offset;
|
|
new->len = ordered->len;
|
|
new->bytenr = ordered->start;
|
|
new->disk_len = ordered->disk_len;
|
|
new->compress_type = ordered->compress_type;
|
|
new->root = RB_ROOT;
|
|
INIT_LIST_HEAD(&new->head);
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
goto out_kfree;
|
|
|
|
key.objectid = btrfs_ino(BTRFS_I(inode));
|
|
key.type = BTRFS_EXTENT_DATA_KEY;
|
|
key.offset = new->file_pos;
|
|
|
|
ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
|
|
if (ret < 0)
|
|
goto out_free_path;
|
|
if (ret > 0 && path->slots[0] > 0)
|
|
path->slots[0]--;
|
|
|
|
/* find out all the old extents for the file range */
|
|
while (1) {
|
|
struct btrfs_file_extent_item *extent;
|
|
struct extent_buffer *l;
|
|
int slot;
|
|
u64 num_bytes;
|
|
u64 offset;
|
|
u64 end;
|
|
u64 disk_bytenr;
|
|
u64 extent_offset;
|
|
|
|
l = path->nodes[0];
|
|
slot = path->slots[0];
|
|
|
|
if (slot >= btrfs_header_nritems(l)) {
|
|
ret = btrfs_next_leaf(root, path);
|
|
if (ret < 0)
|
|
goto out_free_path;
|
|
else if (ret > 0)
|
|
break;
|
|
continue;
|
|
}
|
|
|
|
btrfs_item_key_to_cpu(l, &key, slot);
|
|
|
|
if (key.objectid != btrfs_ino(BTRFS_I(inode)))
|
|
break;
|
|
if (key.type != BTRFS_EXTENT_DATA_KEY)
|
|
break;
|
|
if (key.offset >= new->file_pos + new->len)
|
|
break;
|
|
|
|
extent = btrfs_item_ptr(l, slot, struct btrfs_file_extent_item);
|
|
|
|
num_bytes = btrfs_file_extent_num_bytes(l, extent);
|
|
if (key.offset + num_bytes < new->file_pos)
|
|
goto next;
|
|
|
|
disk_bytenr = btrfs_file_extent_disk_bytenr(l, extent);
|
|
if (!disk_bytenr)
|
|
goto next;
|
|
|
|
extent_offset = btrfs_file_extent_offset(l, extent);
|
|
|
|
old = kmalloc(sizeof(*old), GFP_NOFS);
|
|
if (!old)
|
|
goto out_free_path;
|
|
|
|
offset = max(new->file_pos, key.offset);
|
|
end = min(new->file_pos + new->len, key.offset + num_bytes);
|
|
|
|
old->bytenr = disk_bytenr;
|
|
old->extent_offset = extent_offset;
|
|
old->offset = offset - key.offset;
|
|
old->len = end - offset;
|
|
old->new = new;
|
|
old->count = 0;
|
|
list_add_tail(&old->list, &new->head);
|
|
next:
|
|
path->slots[0]++;
|
|
cond_resched();
|
|
}
|
|
|
|
btrfs_free_path(path);
|
|
atomic_inc(&fs_info->defrag_running);
|
|
|
|
return new;
|
|
|
|
out_free_path:
|
|
btrfs_free_path(path);
|
|
out_kfree:
|
|
free_sa_defrag_extent(new);
|
|
return NULL;
|
|
}
|
|
|
|
static void btrfs_release_delalloc_bytes(struct btrfs_fs_info *fs_info,
|
|
u64 start, u64 len)
|
|
{
|
|
struct btrfs_block_group_cache *cache;
|
|
|
|
cache = btrfs_lookup_block_group(fs_info, start);
|
|
ASSERT(cache);
|
|
|
|
spin_lock(&cache->lock);
|
|
cache->delalloc_bytes -= len;
|
|
spin_unlock(&cache->lock);
|
|
|
|
btrfs_put_block_group(cache);
|
|
}
|
|
|
|
/* as ordered data IO finishes, this gets called so we can finish
|
|
* an ordered extent if the range of bytes in the file it covers are
|
|
* fully written.
|
|
*/
|
|
static int btrfs_finish_ordered_io(struct btrfs_ordered_extent *ordered_extent)
|
|
{
|
|
struct inode *inode = ordered_extent->inode;
|
|
struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
|
|
struct btrfs_root *root = BTRFS_I(inode)->root;
|
|
struct btrfs_trans_handle *trans = NULL;
|
|
struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
|
|
struct extent_state *cached_state = NULL;
|
|
struct new_sa_defrag_extent *new = NULL;
|
|
int compress_type = 0;
|
|
int ret = 0;
|
|
u64 logical_len = ordered_extent->len;
|
|
bool nolock;
|
|
bool truncated = false;
|
|
|
|
nolock = btrfs_is_free_space_inode(BTRFS_I(inode));
|
|
|
|
if (test_bit(BTRFS_ORDERED_IOERR, &ordered_extent->flags)) {
|
|
ret = -EIO;
|
|
goto out;
|
|
}
|
|
|
|
btrfs_free_io_failure_record(inode, ordered_extent->file_offset,
|
|
ordered_extent->file_offset +
|
|
ordered_extent->len - 1);
|
|
|
|
if (test_bit(BTRFS_ORDERED_TRUNCATED, &ordered_extent->flags)) {
|
|
truncated = true;
|
|
logical_len = ordered_extent->truncated_len;
|
|
/* Truncated the entire extent, don't bother adding */
|
|
if (!logical_len)
|
|
goto out;
|
|
}
|
|
|
|
if (test_bit(BTRFS_ORDERED_NOCOW, &ordered_extent->flags)) {
|
|
BUG_ON(!list_empty(&ordered_extent->list)); /* Logic error */
|
|
|
|
/*
|
|
* For mwrite(mmap + memset to write) case, we still reserve
|
|
* space for NOCOW range.
|
|
* As NOCOW won't cause a new delayed ref, just free the space
|
|
*/
|
|
btrfs_qgroup_free_data(inode, ordered_extent->file_offset,
|
|
ordered_extent->len);
|
|
btrfs_ordered_update_i_size(inode, 0, ordered_extent);
|
|
if (nolock)
|
|
trans = btrfs_join_transaction_nolock(root);
|
|
else
|
|
trans = btrfs_join_transaction(root);
|
|
if (IS_ERR(trans)) {
|
|
ret = PTR_ERR(trans);
|
|
trans = NULL;
|
|
goto out;
|
|
}
|
|
trans->block_rsv = &fs_info->delalloc_block_rsv;
|
|
ret = btrfs_update_inode_fallback(trans, root, inode);
|
|
if (ret) /* -ENOMEM or corruption */
|
|
btrfs_abort_transaction(trans, ret);
|
|
goto out;
|
|
}
|
|
|
|
lock_extent_bits(io_tree, ordered_extent->file_offset,
|
|
ordered_extent->file_offset + ordered_extent->len - 1,
|
|
&cached_state);
|
|
|
|
ret = test_range_bit(io_tree, ordered_extent->file_offset,
|
|
ordered_extent->file_offset + ordered_extent->len - 1,
|
|
EXTENT_DEFRAG, 1, cached_state);
|
|
if (ret) {
|
|
u64 last_snapshot = btrfs_root_last_snapshot(&root->root_item);
|
|
if (0 && last_snapshot >= BTRFS_I(inode)->generation)
|
|
/* the inode is shared */
|
|
new = record_old_file_extents(inode, ordered_extent);
|
|
|
|
clear_extent_bit(io_tree, ordered_extent->file_offset,
|
|
ordered_extent->file_offset + ordered_extent->len - 1,
|
|
EXTENT_DEFRAG, 0, 0, &cached_state, GFP_NOFS);
|
|
}
|
|
|
|
if (nolock)
|
|
trans = btrfs_join_transaction_nolock(root);
|
|
else
|
|
trans = btrfs_join_transaction(root);
|
|
if (IS_ERR(trans)) {
|
|
ret = PTR_ERR(trans);
|
|
trans = NULL;
|
|
goto out_unlock;
|
|
}
|
|
|
|
trans->block_rsv = &fs_info->delalloc_block_rsv;
|
|
|
|
if (test_bit(BTRFS_ORDERED_COMPRESSED, &ordered_extent->flags))
|
|
compress_type = ordered_extent->compress_type;
|
|
if (test_bit(BTRFS_ORDERED_PREALLOC, &ordered_extent->flags)) {
|
|
BUG_ON(compress_type);
|
|
ret = btrfs_mark_extent_written(trans, BTRFS_I(inode),
|
|
ordered_extent->file_offset,
|
|
ordered_extent->file_offset +
|
|
logical_len);
|
|
} else {
|
|
BUG_ON(root == fs_info->tree_root);
|
|
ret = insert_reserved_file_extent(trans, inode,
|
|
ordered_extent->file_offset,
|
|
ordered_extent->start,
|
|
ordered_extent->disk_len,
|
|
logical_len, logical_len,
|
|
compress_type, 0, 0,
|
|
BTRFS_FILE_EXTENT_REG);
|
|
if (!ret)
|
|
btrfs_release_delalloc_bytes(fs_info,
|
|
ordered_extent->start,
|
|
ordered_extent->disk_len);
|
|
}
|
|
unpin_extent_cache(&BTRFS_I(inode)->extent_tree,
|
|
ordered_extent->file_offset, ordered_extent->len,
|
|
trans->transid);
|
|
if (ret < 0) {
|
|
btrfs_abort_transaction(trans, ret);
|
|
goto out_unlock;
|
|
}
|
|
|
|
add_pending_csums(trans, inode, &ordered_extent->list);
|
|
|
|
btrfs_ordered_update_i_size(inode, 0, ordered_extent);
|
|
ret = btrfs_update_inode_fallback(trans, root, inode);
|
|
if (ret) { /* -ENOMEM or corruption */
|
|
btrfs_abort_transaction(trans, ret);
|
|
goto out_unlock;
|
|
}
|
|
ret = 0;
|
|
out_unlock:
|
|
unlock_extent_cached(io_tree, ordered_extent->file_offset,
|
|
ordered_extent->file_offset +
|
|
ordered_extent->len - 1, &cached_state, GFP_NOFS);
|
|
out:
|
|
if (root != fs_info->tree_root)
|
|
btrfs_delalloc_release_metadata(BTRFS_I(inode),
|
|
ordered_extent->len);
|
|
if (trans)
|
|
btrfs_end_transaction(trans);
|
|
|
|
if (ret || truncated) {
|
|
u64 start, end;
|
|
|
|
if (truncated)
|
|
start = ordered_extent->file_offset + logical_len;
|
|
else
|
|
start = ordered_extent->file_offset;
|
|
end = ordered_extent->file_offset + ordered_extent->len - 1;
|
|
clear_extent_uptodate(io_tree, start, end, NULL, GFP_NOFS);
|
|
|
|
/* Drop the cache for the part of the extent we didn't write. */
|
|
btrfs_drop_extent_cache(BTRFS_I(inode), start, end, 0);
|
|
|
|
/*
|
|
* If the ordered extent had an IOERR or something else went
|
|
* wrong we need to return the space for this ordered extent
|
|
* back to the allocator. We only free the extent in the
|
|
* truncated case if we didn't write out the extent at all.
|
|
*/
|
|
if ((ret || !logical_len) &&
|
|
!test_bit(BTRFS_ORDERED_NOCOW, &ordered_extent->flags) &&
|
|
!test_bit(BTRFS_ORDERED_PREALLOC, &ordered_extent->flags))
|
|
btrfs_free_reserved_extent(fs_info,
|
|
ordered_extent->start,
|
|
ordered_extent->disk_len, 1);
|
|
}
|
|
|
|
|
|
/*
|
|
* This needs to be done to make sure anybody waiting knows we are done
|
|
* updating everything for this ordered extent.
|
|
*/
|
|
btrfs_remove_ordered_extent(inode, ordered_extent);
|
|
|
|
/* for snapshot-aware defrag */
|
|
if (new) {
|
|
if (ret) {
|
|
free_sa_defrag_extent(new);
|
|
atomic_dec(&fs_info->defrag_running);
|
|
} else {
|
|
relink_file_extents(new);
|
|
}
|
|
}
|
|
|
|
/* once for us */
|
|
btrfs_put_ordered_extent(ordered_extent);
|
|
/* once for the tree */
|
|
btrfs_put_ordered_extent(ordered_extent);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void finish_ordered_fn(struct btrfs_work *work)
|
|
{
|
|
struct btrfs_ordered_extent *ordered_extent;
|
|
ordered_extent = container_of(work, struct btrfs_ordered_extent, work);
|
|
btrfs_finish_ordered_io(ordered_extent);
|
|
}
|
|
|
|
static int btrfs_writepage_end_io_hook(struct page *page, u64 start, u64 end,
|
|
struct extent_state *state, int uptodate)
|
|
{
|
|
struct inode *inode = page->mapping->host;
|
|
struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
|
|
struct btrfs_ordered_extent *ordered_extent = NULL;
|
|
struct btrfs_workqueue *wq;
|
|
btrfs_work_func_t func;
|
|
|
|
trace_btrfs_writepage_end_io_hook(page, start, end, uptodate);
|
|
|
|
ClearPagePrivate2(page);
|
|
if (!btrfs_dec_test_ordered_pending(inode, &ordered_extent, start,
|
|
end - start + 1, uptodate))
|
|
return 0;
|
|
|
|
if (btrfs_is_free_space_inode(BTRFS_I(inode))) {
|
|
wq = fs_info->endio_freespace_worker;
|
|
func = btrfs_freespace_write_helper;
|
|
} else {
|
|
wq = fs_info->endio_write_workers;
|
|
func = btrfs_endio_write_helper;
|
|
}
|
|
|
|
btrfs_init_work(&ordered_extent->work, func, finish_ordered_fn, NULL,
|
|
NULL);
|
|
btrfs_queue_work(wq, &ordered_extent->work);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __readpage_endio_check(struct inode *inode,
|
|
struct btrfs_io_bio *io_bio,
|
|
int icsum, struct page *page,
|
|
int pgoff, u64 start, size_t len)
|
|
{
|
|
char *kaddr;
|
|
u32 csum_expected;
|
|
u32 csum = ~(u32)0;
|
|
|
|
csum_expected = *(((u32 *)io_bio->csum) + icsum);
|
|
|
|
kaddr = kmap_atomic(page);
|
|
csum = btrfs_csum_data(kaddr + pgoff, csum, len);
|
|
btrfs_csum_final(csum, (u8 *)&csum);
|
|
if (csum != csum_expected)
|
|
goto zeroit;
|
|
|
|
kunmap_atomic(kaddr);
|
|
return 0;
|
|
zeroit:
|
|
btrfs_print_data_csum_error(inode, start, csum, csum_expected,
|
|
io_bio->mirror_num);
|
|
memset(kaddr + pgoff, 1, len);
|
|
flush_dcache_page(page);
|
|
kunmap_atomic(kaddr);
|
|
if (csum_expected == 0)
|
|
return 0;
|
|
return -EIO;
|
|
}
|
|
|
|
/*
|
|
* when reads are done, we need to check csums to verify the data is correct
|
|
* if there's a match, we allow the bio to finish. If not, the code in
|
|
* extent_io.c will try to find good copies for us.
|
|
*/
|
|
static int btrfs_readpage_end_io_hook(struct btrfs_io_bio *io_bio,
|
|
u64 phy_offset, struct page *page,
|
|
u64 start, u64 end, int mirror)
|
|
{
|
|
size_t offset = start - page_offset(page);
|
|
struct inode *inode = page->mapping->host;
|
|
struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
|
|
struct btrfs_root *root = BTRFS_I(inode)->root;
|
|
|
|
if (PageChecked(page)) {
|
|
ClearPageChecked(page);
|
|
return 0;
|
|
}
|
|
|
|
if (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM)
|
|
return 0;
|
|
|
|
if (root->root_key.objectid == BTRFS_DATA_RELOC_TREE_OBJECTID &&
|
|
test_range_bit(io_tree, start, end, EXTENT_NODATASUM, 1, NULL)) {
|
|
clear_extent_bits(io_tree, start, end, EXTENT_NODATASUM);
|
|
return 0;
|
|
}
|
|
|
|
phy_offset >>= inode->i_sb->s_blocksize_bits;
|
|
return __readpage_endio_check(inode, io_bio, phy_offset, page, offset,
|
|
start, (size_t)(end - start + 1));
|
|
}
|
|
|
|
void btrfs_add_delayed_iput(struct inode *inode)
|
|
{
|
|
struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
|
|
struct btrfs_inode *binode = BTRFS_I(inode);
|
|
|
|
if (atomic_add_unless(&inode->i_count, -1, 1))
|
|
return;
|
|
|
|
spin_lock(&fs_info->delayed_iput_lock);
|
|
if (binode->delayed_iput_count == 0) {
|
|
ASSERT(list_empty(&binode->delayed_iput));
|
|
list_add_tail(&binode->delayed_iput, &fs_info->delayed_iputs);
|
|
} else {
|
|
binode->delayed_iput_count++;
|
|
}
|
|
spin_unlock(&fs_info->delayed_iput_lock);
|
|
}
|
|
|
|
void btrfs_run_delayed_iputs(struct btrfs_fs_info *fs_info)
|
|
{
|
|
|
|
spin_lock(&fs_info->delayed_iput_lock);
|
|
while (!list_empty(&fs_info->delayed_iputs)) {
|
|
struct btrfs_inode *inode;
|
|
|
|
inode = list_first_entry(&fs_info->delayed_iputs,
|
|
struct btrfs_inode, delayed_iput);
|
|
if (inode->delayed_iput_count) {
|
|
inode->delayed_iput_count--;
|
|
list_move_tail(&inode->delayed_iput,
|
|
&fs_info->delayed_iputs);
|
|
} else {
|
|
list_del_init(&inode->delayed_iput);
|
|
}
|
|
spin_unlock(&fs_info->delayed_iput_lock);
|
|
iput(&inode->vfs_inode);
|
|
spin_lock(&fs_info->delayed_iput_lock);
|
|
}
|
|
spin_unlock(&fs_info->delayed_iput_lock);
|
|
}
|
|
|
|
/*
|
|
* This is called in transaction commit time. If there are no orphan
|
|
* files in the subvolume, it removes orphan item and frees block_rsv
|
|
* structure.
|
|
*/
|
|
void btrfs_orphan_commit_root(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root)
|
|
{
|
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
|
struct btrfs_block_rsv *block_rsv;
|
|
int ret;
|
|
|
|
if (atomic_read(&root->orphan_inodes) ||
|
|
root->orphan_cleanup_state != ORPHAN_CLEANUP_DONE)
|
|
return;
|
|
|
|
spin_lock(&root->orphan_lock);
|
|
if (atomic_read(&root->orphan_inodes)) {
|
|
spin_unlock(&root->orphan_lock);
|
|
return;
|
|
}
|
|
|
|
if (root->orphan_cleanup_state != ORPHAN_CLEANUP_DONE) {
|
|
spin_unlock(&root->orphan_lock);
|
|
return;
|
|
}
|
|
|
|
block_rsv = root->orphan_block_rsv;
|
|
root->orphan_block_rsv = NULL;
|
|
spin_unlock(&root->orphan_lock);
|
|
|
|
if (test_bit(BTRFS_ROOT_ORPHAN_ITEM_INSERTED, &root->state) &&
|
|
btrfs_root_refs(&root->root_item) > 0) {
|
|
ret = btrfs_del_orphan_item(trans, fs_info->tree_root,
|
|
root->root_key.objectid);
|
|
if (ret)
|
|
btrfs_abort_transaction(trans, ret);
|
|
else
|
|
clear_bit(BTRFS_ROOT_ORPHAN_ITEM_INSERTED,
|
|
&root->state);
|
|
}
|
|
|
|
if (block_rsv) {
|
|
WARN_ON(block_rsv->size > 0);
|
|
btrfs_free_block_rsv(fs_info, block_rsv);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* This creates an orphan entry for the given inode in case something goes
|
|
* wrong in the middle of an unlink/truncate.
|
|
*
|
|
* NOTE: caller of this function should reserve 5 units of metadata for
|
|
* this function.
|
|
*/
|
|
int btrfs_orphan_add(struct btrfs_trans_handle *trans, struct inode *inode)
|
|
{
|
|
struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
|
|
struct btrfs_root *root = BTRFS_I(inode)->root;
|
|
struct btrfs_block_rsv *block_rsv = NULL;
|
|
int reserve = 0;
|
|
int insert = 0;
|
|
int ret;
|
|
|
|
if (!root->orphan_block_rsv) {
|
|
block_rsv = btrfs_alloc_block_rsv(fs_info,
|
|
BTRFS_BLOCK_RSV_TEMP);
|
|
if (!block_rsv)
|
|
return -ENOMEM;
|
|
}
|
|
|
|
spin_lock(&root->orphan_lock);
|
|
if (!root->orphan_block_rsv) {
|
|
root->orphan_block_rsv = block_rsv;
|
|
} else if (block_rsv) {
|
|
btrfs_free_block_rsv(fs_info, block_rsv);
|
|
block_rsv = NULL;
|
|
}
|
|
|
|
if (!test_and_set_bit(BTRFS_INODE_HAS_ORPHAN_ITEM,
|
|
&BTRFS_I(inode)->runtime_flags)) {
|
|
#if 0
|
|
/*
|
|
* For proper ENOSPC handling, we should do orphan
|
|
* cleanup when mounting. But this introduces backward
|
|
* compatibility issue.
|
|
*/
|
|
if (!xchg(&root->orphan_item_inserted, 1))
|
|
insert = 2;
|
|
else
|
|
insert = 1;
|
|
#endif
|
|
insert = 1;
|
|
atomic_inc(&root->orphan_inodes);
|
|
}
|
|
|
|
if (!test_and_set_bit(BTRFS_INODE_ORPHAN_META_RESERVED,
|
|
&BTRFS_I(inode)->runtime_flags))
|
|
reserve = 1;
|
|
spin_unlock(&root->orphan_lock);
|
|
|
|
/* grab metadata reservation from transaction handle */
|
|
if (reserve) {
|
|
ret = btrfs_orphan_reserve_metadata(trans, BTRFS_I(inode));
|
|
ASSERT(!ret);
|
|
if (ret) {
|
|
atomic_dec(&root->orphan_inodes);
|
|
clear_bit(BTRFS_INODE_ORPHAN_META_RESERVED,
|
|
&BTRFS_I(inode)->runtime_flags);
|
|
if (insert)
|
|
clear_bit(BTRFS_INODE_HAS_ORPHAN_ITEM,
|
|
&BTRFS_I(inode)->runtime_flags);
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
/* insert an orphan item to track this unlinked/truncated file */
|
|
if (insert >= 1) {
|
|
ret = btrfs_insert_orphan_item(trans, root,
|
|
btrfs_ino(BTRFS_I(inode)));
|
|
if (ret) {
|
|
atomic_dec(&root->orphan_inodes);
|
|
if (reserve) {
|
|
clear_bit(BTRFS_INODE_ORPHAN_META_RESERVED,
|
|
&BTRFS_I(inode)->runtime_flags);
|
|
btrfs_orphan_release_metadata(BTRFS_I(inode));
|
|
}
|
|
if (ret != -EEXIST) {
|
|
clear_bit(BTRFS_INODE_HAS_ORPHAN_ITEM,
|
|
&BTRFS_I(inode)->runtime_flags);
|
|
btrfs_abort_transaction(trans, ret);
|
|
return ret;
|
|
}
|
|
}
|
|
ret = 0;
|
|
}
|
|
|
|
/* insert an orphan item to track subvolume contains orphan files */
|
|
if (insert >= 2) {
|
|
ret = btrfs_insert_orphan_item(trans, fs_info->tree_root,
|
|
root->root_key.objectid);
|
|
if (ret && ret != -EEXIST) {
|
|
btrfs_abort_transaction(trans, ret);
|
|
return ret;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* We have done the truncate/delete so we can go ahead and remove the orphan
|
|
* item for this particular inode.
|
|
*/
|
|
static int btrfs_orphan_del(struct btrfs_trans_handle *trans,
|
|
struct inode *inode)
|
|
{
|
|
struct btrfs_root *root = BTRFS_I(inode)->root;
|
|
int delete_item = 0;
|
|
int release_rsv = 0;
|
|
int ret = 0;
|
|
|
|
spin_lock(&root->orphan_lock);
|
|
if (test_and_clear_bit(BTRFS_INODE_HAS_ORPHAN_ITEM,
|
|
&BTRFS_I(inode)->runtime_flags))
|
|
delete_item = 1;
|
|
|
|
if (test_and_clear_bit(BTRFS_INODE_ORPHAN_META_RESERVED,
|
|
&BTRFS_I(inode)->runtime_flags))
|
|
release_rsv = 1;
|
|
spin_unlock(&root->orphan_lock);
|
|
|
|
if (delete_item) {
|
|
atomic_dec(&root->orphan_inodes);
|
|
if (trans)
|
|
ret = btrfs_del_orphan_item(trans, root,
|
|
btrfs_ino(BTRFS_I(inode)));
|
|
}
|
|
|
|
if (release_rsv)
|
|
btrfs_orphan_release_metadata(BTRFS_I(inode));
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* this cleans up any orphans that may be left on the list from the last use
|
|
* of this root.
|
|
*/
|
|
int btrfs_orphan_cleanup(struct btrfs_root *root)
|
|
{
|
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
|
struct btrfs_path *path;
|
|
struct extent_buffer *leaf;
|
|
struct btrfs_key key, found_key;
|
|
struct btrfs_trans_handle *trans;
|
|
struct inode *inode;
|
|
u64 last_objectid = 0;
|
|
int ret = 0, nr_unlink = 0, nr_truncate = 0;
|
|
|
|
if (cmpxchg(&root->orphan_cleanup_state, 0, ORPHAN_CLEANUP_STARTED))
|
|
return 0;
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
path->reada = READA_BACK;
|
|
|
|
key.objectid = BTRFS_ORPHAN_OBJECTID;
|
|
key.type = BTRFS_ORPHAN_ITEM_KEY;
|
|
key.offset = (u64)-1;
|
|
|
|
while (1) {
|
|
ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
/*
|
|
* if ret == 0 means we found what we were searching for, which
|
|
* is weird, but possible, so only screw with path if we didn't
|
|
* find the key and see if we have stuff that matches
|
|
*/
|
|
if (ret > 0) {
|
|
ret = 0;
|
|
if (path->slots[0] == 0)
|
|
break;
|
|
path->slots[0]--;
|
|
}
|
|
|
|
/* pull out the item */
|
|
leaf = path->nodes[0];
|
|
btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
|
|
|
|
/* make sure the item matches what we want */
|
|
if (found_key.objectid != BTRFS_ORPHAN_OBJECTID)
|
|
break;
|
|
if (found_key.type != BTRFS_ORPHAN_ITEM_KEY)
|
|
break;
|
|
|
|
/* release the path since we're done with it */
|
|
btrfs_release_path(path);
|
|
|
|
/*
|
|
* this is where we are basically btrfs_lookup, without the
|
|
* crossing root thing. we store the inode number in the
|
|
* offset of the orphan item.
|
|
*/
|
|
|
|
if (found_key.offset == last_objectid) {
|
|
btrfs_err(fs_info,
|
|
"Error removing orphan entry, stopping orphan cleanup");
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
last_objectid = found_key.offset;
|
|
|
|
found_key.objectid = found_key.offset;
|
|
found_key.type = BTRFS_INODE_ITEM_KEY;
|
|
found_key.offset = 0;
|
|
inode = btrfs_iget(fs_info->sb, &found_key, root, NULL);
|
|
ret = PTR_ERR_OR_ZERO(inode);
|
|
if (ret && ret != -ENOENT)
|
|
goto out;
|
|
|
|
if (ret == -ENOENT && root == fs_info->tree_root) {
|
|
struct btrfs_root *dead_root;
|
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
|
int is_dead_root = 0;
|
|
|
|
/*
|
|
* this is an orphan in the tree root. Currently these
|
|
* could come from 2 sources:
|
|
* a) a snapshot deletion in progress
|
|
* b) a free space cache inode
|
|
* We need to distinguish those two, as the snapshot
|
|
* orphan must not get deleted.
|
|
* find_dead_roots already ran before us, so if this
|
|
* is a snapshot deletion, we should find the root
|
|
* in the dead_roots list
|
|
*/
|
|
spin_lock(&fs_info->trans_lock);
|
|
list_for_each_entry(dead_root, &fs_info->dead_roots,
|
|
root_list) {
|
|
if (dead_root->root_key.objectid ==
|
|
found_key.objectid) {
|
|
is_dead_root = 1;
|
|
break;
|
|
}
|
|
}
|
|
spin_unlock(&fs_info->trans_lock);
|
|
if (is_dead_root) {
|
|
/* prevent this orphan from being found again */
|
|
key.offset = found_key.objectid - 1;
|
|
continue;
|
|
}
|
|
}
|
|
/*
|
|
* Inode is already gone but the orphan item is still there,
|
|
* kill the orphan item.
|
|
*/
|
|
if (ret == -ENOENT) {
|
|
trans = btrfs_start_transaction(root, 1);
|
|
if (IS_ERR(trans)) {
|
|
ret = PTR_ERR(trans);
|
|
goto out;
|
|
}
|
|
btrfs_debug(fs_info, "auto deleting %Lu",
|
|
found_key.objectid);
|
|
ret = btrfs_del_orphan_item(trans, root,
|
|
found_key.objectid);
|
|
btrfs_end_transaction(trans);
|
|
if (ret)
|
|
goto out;
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* add this inode to the orphan list so btrfs_orphan_del does
|
|
* the proper thing when we hit it
|
|
*/
|
|
set_bit(BTRFS_INODE_HAS_ORPHAN_ITEM,
|
|
&BTRFS_I(inode)->runtime_flags);
|
|
atomic_inc(&root->orphan_inodes);
|
|
|
|
/* if we have links, this was a truncate, lets do that */
|
|
if (inode->i_nlink) {
|
|
if (WARN_ON(!S_ISREG(inode->i_mode))) {
|
|
iput(inode);
|
|
continue;
|
|
}
|
|
nr_truncate++;
|
|
|
|
/* 1 for the orphan item deletion. */
|
|
trans = btrfs_start_transaction(root, 1);
|
|
if (IS_ERR(trans)) {
|
|
iput(inode);
|
|
ret = PTR_ERR(trans);
|
|
goto out;
|
|
}
|
|
ret = btrfs_orphan_add(trans, inode);
|
|
btrfs_end_transaction(trans);
|
|
if (ret) {
|
|
iput(inode);
|
|
goto out;
|
|
}
|
|
|
|
ret = btrfs_truncate(inode);
|
|
if (ret)
|
|
btrfs_orphan_del(NULL, inode);
|
|
} else {
|
|
nr_unlink++;
|
|
}
|
|
|
|
/* this will do delete_inode and everything for us */
|
|
iput(inode);
|
|
if (ret)
|
|
goto out;
|
|
}
|
|
/* release the path since we're done with it */
|
|
btrfs_release_path(path);
|
|
|
|
root->orphan_cleanup_state = ORPHAN_CLEANUP_DONE;
|
|
|
|
if (root->orphan_block_rsv)
|
|
btrfs_block_rsv_release(fs_info, root->orphan_block_rsv,
|
|
(u64)-1);
|
|
|
|
if (root->orphan_block_rsv ||
|
|
test_bit(BTRFS_ROOT_ORPHAN_ITEM_INSERTED, &root->state)) {
|
|
trans = btrfs_join_transaction(root);
|
|
if (!IS_ERR(trans))
|
|
btrfs_end_transaction(trans);
|
|
}
|
|
|
|
if (nr_unlink)
|
|
btrfs_debug(fs_info, "unlinked %d orphans", nr_unlink);
|
|
if (nr_truncate)
|
|
btrfs_debug(fs_info, "truncated %d orphans", nr_truncate);
|
|
|
|
out:
|
|
if (ret)
|
|
btrfs_err(fs_info, "could not do orphan cleanup %d", ret);
|
|
btrfs_free_path(path);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* very simple check to peek ahead in the leaf looking for xattrs. If we
|
|
* don't find any xattrs, we know there can't be any acls.
|
|
*
|
|
* slot is the slot the inode is in, objectid is the objectid of the inode
|
|
*/
|
|
static noinline int acls_after_inode_item(struct extent_buffer *leaf,
|
|
int slot, u64 objectid,
|
|
int *first_xattr_slot)
|
|
{
|
|
u32 nritems = btrfs_header_nritems(leaf);
|
|
struct btrfs_key found_key;
|
|
static u64 xattr_access = 0;
|
|
static u64 xattr_default = 0;
|
|
int scanned = 0;
|
|
|
|
if (!xattr_access) {
|
|
xattr_access = btrfs_name_hash(XATTR_NAME_POSIX_ACL_ACCESS,
|
|
strlen(XATTR_NAME_POSIX_ACL_ACCESS));
|
|
xattr_default = btrfs_name_hash(XATTR_NAME_POSIX_ACL_DEFAULT,
|
|
strlen(XATTR_NAME_POSIX_ACL_DEFAULT));
|
|
}
|
|
|
|
slot++;
|
|
*first_xattr_slot = -1;
|
|
while (slot < nritems) {
|
|
btrfs_item_key_to_cpu(leaf, &found_key, slot);
|
|
|
|
/* we found a different objectid, there must not be acls */
|
|
if (found_key.objectid != objectid)
|
|
return 0;
|
|
|
|
/* we found an xattr, assume we've got an acl */
|
|
if (found_key.type == BTRFS_XATTR_ITEM_KEY) {
|
|
if (*first_xattr_slot == -1)
|
|
*first_xattr_slot = slot;
|
|
if (found_key.offset == xattr_access ||
|
|
found_key.offset == xattr_default)
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* we found a key greater than an xattr key, there can't
|
|
* be any acls later on
|
|
*/
|
|
if (found_key.type > BTRFS_XATTR_ITEM_KEY)
|
|
return 0;
|
|
|
|
slot++;
|
|
scanned++;
|
|
|
|
/*
|
|
* it goes inode, inode backrefs, xattrs, extents,
|
|
* so if there are a ton of hard links to an inode there can
|
|
* be a lot of backrefs. Don't waste time searching too hard,
|
|
* this is just an optimization
|
|
*/
|
|
if (scanned >= 8)
|
|
break;
|
|
}
|
|
/* we hit the end of the leaf before we found an xattr or
|
|
* something larger than an xattr. We have to assume the inode
|
|
* has acls
|
|
*/
|
|
if (*first_xattr_slot == -1)
|
|
*first_xattr_slot = slot;
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* read an inode from the btree into the in-memory inode
|
|
*/
|
|
static int btrfs_read_locked_inode(struct inode *inode)
|
|
{
|
|
struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
|
|
struct btrfs_path *path;
|
|
struct extent_buffer *leaf;
|
|
struct btrfs_inode_item *inode_item;
|
|
struct btrfs_root *root = BTRFS_I(inode)->root;
|
|
struct btrfs_key location;
|
|
unsigned long ptr;
|
|
int maybe_acls;
|
|
u32 rdev;
|
|
int ret;
|
|
bool filled = false;
|
|
int first_xattr_slot;
|
|
|
|
ret = btrfs_fill_inode(inode, &rdev);
|
|
if (!ret)
|
|
filled = true;
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path) {
|
|
ret = -ENOMEM;
|
|
goto make_bad;
|
|
}
|
|
|
|
memcpy(&location, &BTRFS_I(inode)->location, sizeof(location));
|
|
|
|
ret = btrfs_lookup_inode(NULL, root, path, &location, 0);
|
|
if (ret) {
|
|
if (ret > 0)
|
|
ret = -ENOENT;
|
|
goto make_bad;
|
|
}
|
|
|
|
leaf = path->nodes[0];
|
|
|
|
if (filled)
|
|
goto cache_index;
|
|
|
|
inode_item = btrfs_item_ptr(leaf, path->slots[0],
|
|
struct btrfs_inode_item);
|
|
inode->i_mode = btrfs_inode_mode(leaf, inode_item);
|
|
set_nlink(inode, btrfs_inode_nlink(leaf, inode_item));
|
|
i_uid_write(inode, btrfs_inode_uid(leaf, inode_item));
|
|
i_gid_write(inode, btrfs_inode_gid(leaf, inode_item));
|
|
btrfs_i_size_write(BTRFS_I(inode), btrfs_inode_size(leaf, inode_item));
|
|
|
|
inode->i_atime.tv_sec = btrfs_timespec_sec(leaf, &inode_item->atime);
|
|
inode->i_atime.tv_nsec = btrfs_timespec_nsec(leaf, &inode_item->atime);
|
|
|
|
inode->i_mtime.tv_sec = btrfs_timespec_sec(leaf, &inode_item->mtime);
|
|
inode->i_mtime.tv_nsec = btrfs_timespec_nsec(leaf, &inode_item->mtime);
|
|
|
|
inode->i_ctime.tv_sec = btrfs_timespec_sec(leaf, &inode_item->ctime);
|
|
inode->i_ctime.tv_nsec = btrfs_timespec_nsec(leaf, &inode_item->ctime);
|
|
|
|
BTRFS_I(inode)->i_otime.tv_sec =
|
|
btrfs_timespec_sec(leaf, &inode_item->otime);
|
|
BTRFS_I(inode)->i_otime.tv_nsec =
|
|
btrfs_timespec_nsec(leaf, &inode_item->otime);
|
|
|
|
inode_set_bytes(inode, btrfs_inode_nbytes(leaf, inode_item));
|
|
BTRFS_I(inode)->generation = btrfs_inode_generation(leaf, inode_item);
|
|
BTRFS_I(inode)->last_trans = btrfs_inode_transid(leaf, inode_item);
|
|
|
|
inode->i_version = btrfs_inode_sequence(leaf, inode_item);
|
|
inode->i_generation = BTRFS_I(inode)->generation;
|
|
inode->i_rdev = 0;
|
|
rdev = btrfs_inode_rdev(leaf, inode_item);
|
|
|
|
BTRFS_I(inode)->index_cnt = (u64)-1;
|
|
BTRFS_I(inode)->flags = btrfs_inode_flags(leaf, inode_item);
|
|
|
|
cache_index:
|
|
/*
|
|
* If we were modified in the current generation and evicted from memory
|
|
* and then re-read we need to do a full sync since we don't have any
|
|
* idea about which extents were modified before we were evicted from
|
|
* cache.
|
|
*
|
|
* This is required for both inode re-read from disk and delayed inode
|
|
* in delayed_nodes_tree.
|
|
*/
|
|
if (BTRFS_I(inode)->last_trans == fs_info->generation)
|
|
set_bit(BTRFS_INODE_NEEDS_FULL_SYNC,
|
|
&BTRFS_I(inode)->runtime_flags);
|
|
|
|
/*
|
|
* We don't persist the id of the transaction where an unlink operation
|
|
* against the inode was last made. So here we assume the inode might
|
|
* have been evicted, and therefore the exact value of last_unlink_trans
|
|
* lost, and set it to last_trans to avoid metadata inconsistencies
|
|
* between the inode and its parent if the inode is fsync'ed and the log
|
|
* replayed. For example, in the scenario:
|
|
*
|
|
* touch mydir/foo
|
|
* ln mydir/foo mydir/bar
|
|
* sync
|
|
* unlink mydir/bar
|
|
* echo 2 > /proc/sys/vm/drop_caches # evicts inode
|
|
* xfs_io -c fsync mydir/foo
|
|
* <power failure>
|
|
* mount fs, triggers fsync log replay
|
|
*
|
|
* We must make sure that when we fsync our inode foo we also log its
|
|
* parent inode, otherwise after log replay the parent still has the
|
|
* dentry with the "bar" name but our inode foo has a link count of 1
|
|
* and doesn't have an inode ref with the name "bar" anymore.
|
|
*
|
|
* Setting last_unlink_trans to last_trans is a pessimistic approach,
|
|
* but it guarantees correctness at the expense of occasional full
|
|
* transaction commits on fsync if our inode is a directory, or if our
|
|
* inode is not a directory, logging its parent unnecessarily.
|
|
*/
|
|
BTRFS_I(inode)->last_unlink_trans = BTRFS_I(inode)->last_trans;
|
|
|
|
path->slots[0]++;
|
|
if (inode->i_nlink != 1 ||
|
|
path->slots[0] >= btrfs_header_nritems(leaf))
|
|
goto cache_acl;
|
|
|
|
btrfs_item_key_to_cpu(leaf, &location, path->slots[0]);
|
|
if (location.objectid != btrfs_ino(BTRFS_I(inode)))
|
|
goto cache_acl;
|
|
|
|
ptr = btrfs_item_ptr_offset(leaf, path->slots[0]);
|
|
if (location.type == BTRFS_INODE_REF_KEY) {
|
|
struct btrfs_inode_ref *ref;
|
|
|
|
ref = (struct btrfs_inode_ref *)ptr;
|
|
BTRFS_I(inode)->dir_index = btrfs_inode_ref_index(leaf, ref);
|
|
} else if (location.type == BTRFS_INODE_EXTREF_KEY) {
|
|
struct btrfs_inode_extref *extref;
|
|
|
|
extref = (struct btrfs_inode_extref *)ptr;
|
|
BTRFS_I(inode)->dir_index = btrfs_inode_extref_index(leaf,
|
|
extref);
|
|
}
|
|
cache_acl:
|
|
/*
|
|
* try to precache a NULL acl entry for files that don't have
|
|
* any xattrs or acls
|
|
*/
|
|
maybe_acls = acls_after_inode_item(leaf, path->slots[0],
|
|
btrfs_ino(BTRFS_I(inode)), &first_xattr_slot);
|
|
if (first_xattr_slot != -1) {
|
|
path->slots[0] = first_xattr_slot;
|
|
ret = btrfs_load_inode_props(inode, path);
|
|
if (ret)
|
|
btrfs_err(fs_info,
|
|
"error loading props for ino %llu (root %llu): %d",
|
|
btrfs_ino(BTRFS_I(inode)),
|
|
root->root_key.objectid, ret);
|
|
}
|
|
btrfs_free_path(path);
|
|
|
|
if (!maybe_acls)
|
|
cache_no_acl(inode);
|
|
|
|
switch (inode->i_mode & S_IFMT) {
|
|
case S_IFREG:
|
|
inode->i_mapping->a_ops = &btrfs_aops;
|
|
BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops;
|
|
inode->i_fop = &btrfs_file_operations;
|
|
inode->i_op = &btrfs_file_inode_operations;
|
|
break;
|
|
case S_IFDIR:
|
|
inode->i_fop = &btrfs_dir_file_operations;
|
|
inode->i_op = &btrfs_dir_inode_operations;
|
|
break;
|
|
case S_IFLNK:
|
|
inode->i_op = &btrfs_symlink_inode_operations;
|
|
inode_nohighmem(inode);
|
|
inode->i_mapping->a_ops = &btrfs_symlink_aops;
|
|
break;
|
|
default:
|
|
inode->i_op = &btrfs_special_inode_operations;
|
|
init_special_inode(inode, inode->i_mode, rdev);
|
|
break;
|
|
}
|
|
|
|
btrfs_update_iflags(inode);
|
|
return 0;
|
|
|
|
make_bad:
|
|
btrfs_free_path(path);
|
|
make_bad_inode(inode);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* given a leaf and an inode, copy the inode fields into the leaf
|
|
*/
|
|
static void fill_inode_item(struct btrfs_trans_handle *trans,
|
|
struct extent_buffer *leaf,
|
|
struct btrfs_inode_item *item,
|
|
struct inode *inode)
|
|
{
|
|
struct btrfs_map_token token;
|
|
|
|
btrfs_init_map_token(&token);
|
|
|
|
btrfs_set_token_inode_uid(leaf, item, i_uid_read(inode), &token);
|
|
btrfs_set_token_inode_gid(leaf, item, i_gid_read(inode), &token);
|
|
btrfs_set_token_inode_size(leaf, item, BTRFS_I(inode)->disk_i_size,
|
|
&token);
|
|
btrfs_set_token_inode_mode(leaf, item, inode->i_mode, &token);
|
|
btrfs_set_token_inode_nlink(leaf, item, inode->i_nlink, &token);
|
|
|
|
btrfs_set_token_timespec_sec(leaf, &item->atime,
|
|
inode->i_atime.tv_sec, &token);
|
|
btrfs_set_token_timespec_nsec(leaf, &item->atime,
|
|
inode->i_atime.tv_nsec, &token);
|
|
|
|
btrfs_set_token_timespec_sec(leaf, &item->mtime,
|
|
inode->i_mtime.tv_sec, &token);
|
|
btrfs_set_token_timespec_nsec(leaf, &item->mtime,
|
|
inode->i_mtime.tv_nsec, &token);
|
|
|
|
btrfs_set_token_timespec_sec(leaf, &item->ctime,
|
|
inode->i_ctime.tv_sec, &token);
|
|
btrfs_set_token_timespec_nsec(leaf, &item->ctime,
|
|
inode->i_ctime.tv_nsec, &token);
|
|
|
|
btrfs_set_token_timespec_sec(leaf, &item->otime,
|
|
BTRFS_I(inode)->i_otime.tv_sec, &token);
|
|
btrfs_set_token_timespec_nsec(leaf, &item->otime,
|
|
BTRFS_I(inode)->i_otime.tv_nsec, &token);
|
|
|
|
btrfs_set_token_inode_nbytes(leaf, item, inode_get_bytes(inode),
|
|
&token);
|
|
btrfs_set_token_inode_generation(leaf, item, BTRFS_I(inode)->generation,
|
|
&token);
|
|
btrfs_set_token_inode_sequence(leaf, item, inode->i_version, &token);
|
|
btrfs_set_token_inode_transid(leaf, item, trans->transid, &token);
|
|
btrfs_set_token_inode_rdev(leaf, item, inode->i_rdev, &token);
|
|
btrfs_set_token_inode_flags(leaf, item, BTRFS_I(inode)->flags, &token);
|
|
btrfs_set_token_inode_block_group(leaf, item, 0, &token);
|
|
}
|
|
|
|
/*
|
|
* copy everything in the in-memory inode into the btree.
|
|
*/
|
|
static noinline int btrfs_update_inode_item(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root, struct inode *inode)
|
|
{
|
|
struct btrfs_inode_item *inode_item;
|
|
struct btrfs_path *path;
|
|
struct extent_buffer *leaf;
|
|
int ret;
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
|
|
path->leave_spinning = 1;
|
|
ret = btrfs_lookup_inode(trans, root, path, &BTRFS_I(inode)->location,
|
|
1);
|
|
if (ret) {
|
|
if (ret > 0)
|
|
ret = -ENOENT;
|
|
goto failed;
|
|
}
|
|
|
|
leaf = path->nodes[0];
|
|
inode_item = btrfs_item_ptr(leaf, path->slots[0],
|
|
struct btrfs_inode_item);
|
|
|
|
fill_inode_item(trans, leaf, inode_item, inode);
|
|
btrfs_mark_buffer_dirty(leaf);
|
|
btrfs_set_inode_last_trans(trans, inode);
|
|
ret = 0;
|
|
failed:
|
|
btrfs_free_path(path);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* copy everything in the in-memory inode into the btree.
|
|
*/
|
|
noinline int btrfs_update_inode(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root, struct inode *inode)
|
|
{
|
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
|
int ret;
|
|
|
|
/*
|
|
* If the inode is a free space inode, we can deadlock during commit
|
|
* if we put it into the delayed code.
|
|
*
|
|
* The data relocation inode should also be directly updated
|
|
* without delay
|
|
*/
|
|
if (!btrfs_is_free_space_inode(BTRFS_I(inode))
|
|
&& root->root_key.objectid != BTRFS_DATA_RELOC_TREE_OBJECTID
|
|
&& !test_bit(BTRFS_FS_LOG_RECOVERING, &fs_info->flags)) {
|
|
btrfs_update_root_times(trans, root);
|
|
|
|
ret = btrfs_delayed_update_inode(trans, root, inode);
|
|
if (!ret)
|
|
btrfs_set_inode_last_trans(trans, inode);
|
|
return ret;
|
|
}
|
|
|
|
return btrfs_update_inode_item(trans, root, inode);
|
|
}
|
|
|
|
noinline int btrfs_update_inode_fallback(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root,
|
|
struct inode *inode)
|
|
{
|
|
int ret;
|
|
|
|
ret = btrfs_update_inode(trans, root, inode);
|
|
if (ret == -ENOSPC)
|
|
return btrfs_update_inode_item(trans, root, inode);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* unlink helper that gets used here in inode.c and in the tree logging
|
|
* recovery code. It remove a link in a directory with a given name, and
|
|
* also drops the back refs in the inode to the directory
|
|
*/
|
|
static int __btrfs_unlink_inode(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root,
|
|
struct btrfs_inode *dir,
|
|
struct btrfs_inode *inode,
|
|
const char *name, int name_len)
|
|
{
|
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
|
struct btrfs_path *path;
|
|
int ret = 0;
|
|
struct extent_buffer *leaf;
|
|
struct btrfs_dir_item *di;
|
|
struct btrfs_key key;
|
|
u64 index;
|
|
u64 ino = btrfs_ino(inode);
|
|
u64 dir_ino = btrfs_ino(dir);
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
path->leave_spinning = 1;
|
|
di = btrfs_lookup_dir_item(trans, root, path, dir_ino,
|
|
name, name_len, -1);
|
|
if (IS_ERR(di)) {
|
|
ret = PTR_ERR(di);
|
|
goto err;
|
|
}
|
|
if (!di) {
|
|
ret = -ENOENT;
|
|
goto err;
|
|
}
|
|
leaf = path->nodes[0];
|
|
btrfs_dir_item_key_to_cpu(leaf, di, &key);
|
|
ret = btrfs_delete_one_dir_name(trans, root, path, di);
|
|
if (ret)
|
|
goto err;
|
|
btrfs_release_path(path);
|
|
|
|
/*
|
|
* If we don't have dir index, we have to get it by looking up
|
|
* the inode ref, since we get the inode ref, remove it directly,
|
|
* it is unnecessary to do delayed deletion.
|
|
*
|
|
* But if we have dir index, needn't search inode ref to get it.
|
|
* Since the inode ref is close to the inode item, it is better
|
|
* that we delay to delete it, and just do this deletion when
|
|
* we update the inode item.
|
|
*/
|
|
if (inode->dir_index) {
|
|
ret = btrfs_delayed_delete_inode_ref(inode);
|
|
if (!ret) {
|
|
index = inode->dir_index;
|
|
goto skip_backref;
|
|
}
|
|
}
|
|
|
|
ret = btrfs_del_inode_ref(trans, root, name, name_len, ino,
|
|
dir_ino, &index);
|
|
if (ret) {
|
|
btrfs_info(fs_info,
|
|
"failed to delete reference to %.*s, inode %llu parent %llu",
|
|
name_len, name, ino, dir_ino);
|
|
btrfs_abort_transaction(trans, ret);
|
|
goto err;
|
|
}
|
|
skip_backref:
|
|
ret = btrfs_delete_delayed_dir_index(trans, fs_info, dir, index);
|
|
if (ret) {
|
|
btrfs_abort_transaction(trans, ret);
|
|
goto err;
|
|
}
|
|
|
|
ret = btrfs_del_inode_ref_in_log(trans, root, name, name_len, inode,
|
|
dir_ino);
|
|
if (ret != 0 && ret != -ENOENT) {
|
|
btrfs_abort_transaction(trans, ret);
|
|
goto err;
|
|
}
|
|
|
|
ret = btrfs_del_dir_entries_in_log(trans, root, name, name_len, dir,
|
|
index);
|
|
if (ret == -ENOENT)
|
|
ret = 0;
|
|
else if (ret)
|
|
btrfs_abort_transaction(trans, ret);
|
|
err:
|
|
btrfs_free_path(path);
|
|
if (ret)
|
|
goto out;
|
|
|
|
btrfs_i_size_write(dir, dir->vfs_inode.i_size - name_len * 2);
|
|
inode_inc_iversion(&inode->vfs_inode);
|
|
inode_inc_iversion(&dir->vfs_inode);
|
|
inode->vfs_inode.i_ctime = dir->vfs_inode.i_mtime =
|
|
dir->vfs_inode.i_ctime = current_time(&inode->vfs_inode);
|
|
ret = btrfs_update_inode(trans, root, &dir->vfs_inode);
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
int btrfs_unlink_inode(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root,
|
|
struct btrfs_inode *dir, struct btrfs_inode *inode,
|
|
const char *name, int name_len)
|
|
{
|
|
int ret;
|
|
ret = __btrfs_unlink_inode(trans, root, dir, inode, name, name_len);
|
|
if (!ret) {
|
|
drop_nlink(&inode->vfs_inode);
|
|
ret = btrfs_update_inode(trans, root, &inode->vfs_inode);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* helper to start transaction for unlink and rmdir.
|
|
*
|
|
* unlink and rmdir are special in btrfs, they do not always free space, so
|
|
* if we cannot make our reservations the normal way try and see if there is
|
|
* plenty of slack room in the global reserve to migrate, otherwise we cannot
|
|
* allow the unlink to occur.
|
|
*/
|
|
static struct btrfs_trans_handle *__unlink_start_trans(struct inode *dir)
|
|
{
|
|
struct btrfs_root *root = BTRFS_I(dir)->root;
|
|
|
|
/*
|
|
* 1 for the possible orphan item
|
|
* 1 for the dir item
|
|
* 1 for the dir index
|
|
* 1 for the inode ref
|
|
* 1 for the inode
|
|
*/
|
|
return btrfs_start_transaction_fallback_global_rsv(root, 5, 5);
|
|
}
|
|
|
|
static int btrfs_unlink(struct inode *dir, struct dentry *dentry)
|
|
{
|
|
struct btrfs_root *root = BTRFS_I(dir)->root;
|
|
struct btrfs_trans_handle *trans;
|
|
struct inode *inode = d_inode(dentry);
|
|
int ret;
|
|
|
|
trans = __unlink_start_trans(dir);
|
|
if (IS_ERR(trans))
|
|
return PTR_ERR(trans);
|
|
|
|
btrfs_record_unlink_dir(trans, BTRFS_I(dir), BTRFS_I(d_inode(dentry)),
|
|
0);
|
|
|
|
ret = btrfs_unlink_inode(trans, root, BTRFS_I(dir),
|
|
BTRFS_I(d_inode(dentry)), dentry->d_name.name,
|
|
dentry->d_name.len);
|
|
if (ret)
|
|
goto out;
|
|
|
|
if (inode->i_nlink == 0) {
|
|
ret = btrfs_orphan_add(trans, inode);
|
|
if (ret)
|
|
goto out;
|
|
}
|
|
|
|
out:
|
|
btrfs_end_transaction(trans);
|
|
btrfs_btree_balance_dirty(root->fs_info);
|
|
return ret;
|
|
}
|
|
|
|
int btrfs_unlink_subvol(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root,
|
|
struct inode *dir, u64 objectid,
|
|
const char *name, int name_len)
|
|
{
|
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
|
struct btrfs_path *path;
|
|
struct extent_buffer *leaf;
|
|
struct btrfs_dir_item *di;
|
|
struct btrfs_key key;
|
|
u64 index;
|
|
int ret;
|
|
u64 dir_ino = btrfs_ino(BTRFS_I(dir));
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
|
|
di = btrfs_lookup_dir_item(trans, root, path, dir_ino,
|
|
name, name_len, -1);
|
|
if (IS_ERR_OR_NULL(di)) {
|
|
if (!di)
|
|
ret = -ENOENT;
|
|
else
|
|
ret = PTR_ERR(di);
|
|
goto out;
|
|
}
|
|
|
|
leaf = path->nodes[0];
|
|
btrfs_dir_item_key_to_cpu(leaf, di, &key);
|
|
WARN_ON(key.type != BTRFS_ROOT_ITEM_KEY || key.objectid != objectid);
|
|
ret = btrfs_delete_one_dir_name(trans, root, path, di);
|
|
if (ret) {
|
|
btrfs_abort_transaction(trans, ret);
|
|
goto out;
|
|
}
|
|
btrfs_release_path(path);
|
|
|
|
ret = btrfs_del_root_ref(trans, fs_info, objectid,
|
|
root->root_key.objectid, dir_ino,
|
|
&index, name, name_len);
|
|
if (ret < 0) {
|
|
if (ret != -ENOENT) {
|
|
btrfs_abort_transaction(trans, ret);
|
|
goto out;
|
|
}
|
|
di = btrfs_search_dir_index_item(root, path, dir_ino,
|
|
name, name_len);
|
|
if (IS_ERR_OR_NULL(di)) {
|
|
if (!di)
|
|
ret = -ENOENT;
|
|
else
|
|
ret = PTR_ERR(di);
|
|
btrfs_abort_transaction(trans, ret);
|
|
goto out;
|
|
}
|
|
|
|
leaf = path->nodes[0];
|
|
btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
|
|
btrfs_release_path(path);
|
|
index = key.offset;
|
|
}
|
|
btrfs_release_path(path);
|
|
|
|
ret = btrfs_delete_delayed_dir_index(trans, fs_info, BTRFS_I(dir), index);
|
|
if (ret) {
|
|
btrfs_abort_transaction(trans, ret);
|
|
goto out;
|
|
}
|
|
|
|
btrfs_i_size_write(BTRFS_I(dir), dir->i_size - name_len * 2);
|
|
inode_inc_iversion(dir);
|
|
dir->i_mtime = dir->i_ctime = current_time(dir);
|
|
ret = btrfs_update_inode_fallback(trans, root, dir);
|
|
if (ret)
|
|
btrfs_abort_transaction(trans, ret);
|
|
out:
|
|
btrfs_free_path(path);
|
|
return ret;
|
|
}
|
|
|
|
static int btrfs_rmdir(struct inode *dir, struct dentry *dentry)
|
|
{
|
|
struct inode *inode = d_inode(dentry);
|
|
int err = 0;
|
|
struct btrfs_root *root = BTRFS_I(dir)->root;
|
|
struct btrfs_trans_handle *trans;
|
|
u64 last_unlink_trans;
|
|
|
|
if (inode->i_size > BTRFS_EMPTY_DIR_SIZE)
|
|
return -ENOTEMPTY;
|
|
if (btrfs_ino(BTRFS_I(inode)) == BTRFS_FIRST_FREE_OBJECTID)
|
|
return -EPERM;
|
|
|
|
trans = __unlink_start_trans(dir);
|
|
if (IS_ERR(trans))
|
|
return PTR_ERR(trans);
|
|
|
|
if (unlikely(btrfs_ino(BTRFS_I(inode)) == BTRFS_EMPTY_SUBVOL_DIR_OBJECTID)) {
|
|
err = btrfs_unlink_subvol(trans, root, dir,
|
|
BTRFS_I(inode)->location.objectid,
|
|
dentry->d_name.name,
|
|
dentry->d_name.len);
|
|
goto out;
|
|
}
|
|
|
|
err = btrfs_orphan_add(trans, inode);
|
|
if (err)
|
|
goto out;
|
|
|
|
last_unlink_trans = BTRFS_I(inode)->last_unlink_trans;
|
|
|
|
/* now the directory is empty */
|
|
err = btrfs_unlink_inode(trans, root, BTRFS_I(dir),
|
|
BTRFS_I(d_inode(dentry)), dentry->d_name.name,
|
|
dentry->d_name.len);
|
|
if (!err) {
|
|
btrfs_i_size_write(BTRFS_I(inode), 0);
|
|
/*
|
|
* Propagate the last_unlink_trans value of the deleted dir to
|
|
* its parent directory. This is to prevent an unrecoverable
|
|
* log tree in the case we do something like this:
|
|
* 1) create dir foo
|
|
* 2) create snapshot under dir foo
|
|
* 3) delete the snapshot
|
|
* 4) rmdir foo
|
|
* 5) mkdir foo
|
|
* 6) fsync foo or some file inside foo
|
|
*/
|
|
if (last_unlink_trans >= trans->transid)
|
|
BTRFS_I(dir)->last_unlink_trans = last_unlink_trans;
|
|
}
|
|
out:
|
|
btrfs_end_transaction(trans);
|
|
btrfs_btree_balance_dirty(root->fs_info);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int truncate_space_check(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root,
|
|
u64 bytes_deleted)
|
|
{
|
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
|
int ret;
|
|
|
|
/*
|
|
* This is only used to apply pressure to the enospc system, we don't
|
|
* intend to use this reservation at all.
|
|
*/
|
|
bytes_deleted = btrfs_csum_bytes_to_leaves(fs_info, bytes_deleted);
|
|
bytes_deleted *= fs_info->nodesize;
|
|
ret = btrfs_block_rsv_add(root, &fs_info->trans_block_rsv,
|
|
bytes_deleted, BTRFS_RESERVE_NO_FLUSH);
|
|
if (!ret) {
|
|
trace_btrfs_space_reservation(fs_info, "transaction",
|
|
trans->transid,
|
|
bytes_deleted, 1);
|
|
trans->bytes_reserved += bytes_deleted;
|
|
}
|
|
return ret;
|
|
|
|
}
|
|
|
|
static int truncate_inline_extent(struct inode *inode,
|
|
struct btrfs_path *path,
|
|
struct btrfs_key *found_key,
|
|
const u64 item_end,
|
|
const u64 new_size)
|
|
{
|
|
struct extent_buffer *leaf = path->nodes[0];
|
|
int slot = path->slots[0];
|
|
struct btrfs_file_extent_item *fi;
|
|
u32 size = (u32)(new_size - found_key->offset);
|
|
struct btrfs_root *root = BTRFS_I(inode)->root;
|
|
|
|
fi = btrfs_item_ptr(leaf, slot, struct btrfs_file_extent_item);
|
|
|
|
if (btrfs_file_extent_compression(leaf, fi) != BTRFS_COMPRESS_NONE) {
|
|
loff_t offset = new_size;
|
|
loff_t page_end = ALIGN(offset, PAGE_SIZE);
|
|
|
|
/*
|
|
* Zero out the remaining of the last page of our inline extent,
|
|
* instead of directly truncating our inline extent here - that
|
|
* would be much more complex (decompressing all the data, then
|
|
* compressing the truncated data, which might be bigger than
|
|
* the size of the inline extent, resize the extent, etc).
|
|
* We release the path because to get the page we might need to
|
|
* read the extent item from disk (data not in the page cache).
|
|
*/
|
|
btrfs_release_path(path);
|
|
return btrfs_truncate_block(inode, offset, page_end - offset,
|
|
0);
|
|
}
|
|
|
|
btrfs_set_file_extent_ram_bytes(leaf, fi, size);
|
|
size = btrfs_file_extent_calc_inline_size(size);
|
|
btrfs_truncate_item(root->fs_info, path, size, 1);
|
|
|
|
if (test_bit(BTRFS_ROOT_REF_COWS, &root->state))
|
|
inode_sub_bytes(inode, item_end + 1 - new_size);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* this can truncate away extent items, csum items and directory items.
|
|
* It starts at a high offset and removes keys until it can't find
|
|
* any higher than new_size
|
|
*
|
|
* csum items that cross the new i_size are truncated to the new size
|
|
* as well.
|
|
*
|
|
* min_type is the minimum key type to truncate down to. If set to 0, this
|
|
* will kill all the items on this inode, including the INODE_ITEM_KEY.
|
|
*/
|
|
int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root,
|
|
struct inode *inode,
|
|
u64 new_size, u32 min_type)
|
|
{
|
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
|
struct btrfs_path *path;
|
|
struct extent_buffer *leaf;
|
|
struct btrfs_file_extent_item *fi;
|
|
struct btrfs_key key;
|
|
struct btrfs_key found_key;
|
|
u64 extent_start = 0;
|
|
u64 extent_num_bytes = 0;
|
|
u64 extent_offset = 0;
|
|
u64 item_end = 0;
|
|
u64 last_size = new_size;
|
|
u32 found_type = (u8)-1;
|
|
int found_extent;
|
|
int del_item;
|
|
int pending_del_nr = 0;
|
|
int pending_del_slot = 0;
|
|
int extent_type = -1;
|
|
int ret;
|
|
int err = 0;
|
|
u64 ino = btrfs_ino(BTRFS_I(inode));
|
|
u64 bytes_deleted = 0;
|
|
bool be_nice = 0;
|
|
bool should_throttle = 0;
|
|
bool should_end = 0;
|
|
|
|
BUG_ON(new_size > 0 && min_type != BTRFS_EXTENT_DATA_KEY);
|
|
|
|
/*
|
|
* for non-free space inodes and ref cows, we want to back off from
|
|
* time to time
|
|
*/
|
|
if (!btrfs_is_free_space_inode(BTRFS_I(inode)) &&
|
|
test_bit(BTRFS_ROOT_REF_COWS, &root->state))
|
|
be_nice = 1;
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
path->reada = READA_BACK;
|
|
|
|
/*
|
|
* We want to drop from the next block forward in case this new size is
|
|
* not block aligned since we will be keeping the last block of the
|
|
* extent just the way it is.
|
|
*/
|
|
if (test_bit(BTRFS_ROOT_REF_COWS, &root->state) ||
|
|
root == fs_info->tree_root)
|
|
btrfs_drop_extent_cache(BTRFS_I(inode), ALIGN(new_size,
|
|
fs_info->sectorsize),
|
|
(u64)-1, 0);
|
|
|
|
/*
|
|
* This function is also used to drop the items in the log tree before
|
|
* we relog the inode, so if root != BTRFS_I(inode)->root, it means
|
|
* it is used to drop the loged items. So we shouldn't kill the delayed
|
|
* items.
|
|
*/
|
|
if (min_type == 0 && root == BTRFS_I(inode)->root)
|
|
btrfs_kill_delayed_inode_items(BTRFS_I(inode));
|
|
|
|
key.objectid = ino;
|
|
key.offset = (u64)-1;
|
|
key.type = (u8)-1;
|
|
|
|
search_again:
|
|
/*
|
|
* with a 16K leaf size and 128MB extents, you can actually queue
|
|
* up a huge file in a single leaf. Most of the time that
|
|
* bytes_deleted is > 0, it will be huge by the time we get here
|
|
*/
|
|
if (be_nice && bytes_deleted > SZ_32M) {
|
|
if (btrfs_should_end_transaction(trans)) {
|
|
err = -EAGAIN;
|
|
goto error;
|
|
}
|
|
}
|
|
|
|
|
|
path->leave_spinning = 1;
|
|
ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
|
|
if (ret < 0) {
|
|
err = ret;
|
|
goto out;
|
|
}
|
|
|
|
if (ret > 0) {
|
|
/* there are no items in the tree for us to truncate, we're
|
|
* done
|
|
*/
|
|
if (path->slots[0] == 0)
|
|
goto out;
|
|
path->slots[0]--;
|
|
}
|
|
|
|
while (1) {
|
|
fi = NULL;
|
|
leaf = path->nodes[0];
|
|
btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
|
|
found_type = found_key.type;
|
|
|
|
if (found_key.objectid != ino)
|
|
break;
|
|
|
|
if (found_type < min_type)
|
|
break;
|
|
|
|
item_end = found_key.offset;
|
|
if (found_type == BTRFS_EXTENT_DATA_KEY) {
|
|
fi = btrfs_item_ptr(leaf, path->slots[0],
|
|
struct btrfs_file_extent_item);
|
|
extent_type = btrfs_file_extent_type(leaf, fi);
|
|
if (extent_type != BTRFS_FILE_EXTENT_INLINE) {
|
|
item_end +=
|
|
btrfs_file_extent_num_bytes(leaf, fi);
|
|
} else if (extent_type == BTRFS_FILE_EXTENT_INLINE) {
|
|
item_end += btrfs_file_extent_inline_len(leaf,
|
|
path->slots[0], fi);
|
|
}
|
|
item_end--;
|
|
}
|
|
if (found_type > min_type) {
|
|
del_item = 1;
|
|
} else {
|
|
if (item_end < new_size) {
|
|
/*
|
|
* With NO_HOLES mode, for the following mapping
|
|
*
|
|
* [0-4k][hole][8k-12k]
|
|
*
|
|
* if truncating isize down to 6k, it ends up
|
|
* isize being 8k.
|
|
*/
|
|
if (btrfs_fs_incompat(root->fs_info, NO_HOLES))
|
|
last_size = new_size;
|
|
break;
|
|
}
|
|
if (found_key.offset >= new_size)
|
|
del_item = 1;
|
|
else
|
|
del_item = 0;
|
|
}
|
|
found_extent = 0;
|
|
/* FIXME, shrink the extent if the ref count is only 1 */
|
|
if (found_type != BTRFS_EXTENT_DATA_KEY)
|
|
goto delete;
|
|
|
|
if (del_item)
|
|
last_size = found_key.offset;
|
|
else
|
|
last_size = new_size;
|
|
|
|
if (extent_type != BTRFS_FILE_EXTENT_INLINE) {
|
|
u64 num_dec;
|
|
extent_start = btrfs_file_extent_disk_bytenr(leaf, fi);
|
|
if (!del_item) {
|
|
u64 orig_num_bytes =
|
|
btrfs_file_extent_num_bytes(leaf, fi);
|
|
extent_num_bytes = ALIGN(new_size -
|
|
found_key.offset,
|
|
fs_info->sectorsize);
|
|
btrfs_set_file_extent_num_bytes(leaf, fi,
|
|
extent_num_bytes);
|
|
num_dec = (orig_num_bytes -
|
|
extent_num_bytes);
|
|
if (test_bit(BTRFS_ROOT_REF_COWS,
|
|
&root->state) &&
|
|
extent_start != 0)
|
|
inode_sub_bytes(inode, num_dec);
|
|
btrfs_mark_buffer_dirty(leaf);
|
|
} else {
|
|
extent_num_bytes =
|
|
btrfs_file_extent_disk_num_bytes(leaf,
|
|
fi);
|
|
extent_offset = found_key.offset -
|
|
btrfs_file_extent_offset(leaf, fi);
|
|
|
|
/* FIXME blocksize != 4096 */
|
|
num_dec = btrfs_file_extent_num_bytes(leaf, fi);
|
|
if (extent_start != 0) {
|
|
found_extent = 1;
|
|
if (test_bit(BTRFS_ROOT_REF_COWS,
|
|
&root->state))
|
|
inode_sub_bytes(inode, num_dec);
|
|
}
|
|
}
|
|
} else if (extent_type == BTRFS_FILE_EXTENT_INLINE) {
|
|
/*
|
|
* we can't truncate inline items that have had
|
|
* special encodings
|
|
*/
|
|
if (!del_item &&
|
|
btrfs_file_extent_encryption(leaf, fi) == 0 &&
|
|
btrfs_file_extent_other_encoding(leaf, fi) == 0) {
|
|
|
|
/*
|
|
* Need to release path in order to truncate a
|
|
* compressed extent. So delete any accumulated
|
|
* extent items so far.
|
|
*/
|
|
if (btrfs_file_extent_compression(leaf, fi) !=
|
|
BTRFS_COMPRESS_NONE && pending_del_nr) {
|
|
err = btrfs_del_items(trans, root, path,
|
|
pending_del_slot,
|
|
pending_del_nr);
|
|
if (err) {
|
|
btrfs_abort_transaction(trans,
|
|
err);
|
|
goto error;
|
|
}
|
|
pending_del_nr = 0;
|
|
}
|
|
|
|
err = truncate_inline_extent(inode, path,
|
|
&found_key,
|
|
item_end,
|
|
new_size);
|
|
if (err) {
|
|
btrfs_abort_transaction(trans, err);
|
|
goto error;
|
|
}
|
|
} else if (test_bit(BTRFS_ROOT_REF_COWS,
|
|
&root->state)) {
|
|
inode_sub_bytes(inode, item_end + 1 - new_size);
|
|
}
|
|
}
|
|
delete:
|
|
if (del_item) {
|
|
if (!pending_del_nr) {
|
|
/* no pending yet, add ourselves */
|
|
pending_del_slot = path->slots[0];
|
|
pending_del_nr = 1;
|
|
} else if (pending_del_nr &&
|
|
path->slots[0] + 1 == pending_del_slot) {
|
|
/* hop on the pending chunk */
|
|
pending_del_nr++;
|
|
pending_del_slot = path->slots[0];
|
|
} else {
|
|
BUG();
|
|
}
|
|
} else {
|
|
break;
|
|
}
|
|
should_throttle = 0;
|
|
|
|
if (found_extent &&
|
|
(test_bit(BTRFS_ROOT_REF_COWS, &root->state) ||
|
|
root == fs_info->tree_root)) {
|
|
btrfs_set_path_blocking(path);
|
|
bytes_deleted += extent_num_bytes;
|
|
ret = btrfs_free_extent(trans, fs_info, extent_start,
|
|
extent_num_bytes, 0,
|
|
btrfs_header_owner(leaf),
|
|
ino, extent_offset);
|
|
BUG_ON(ret);
|
|
if (btrfs_should_throttle_delayed_refs(trans, fs_info))
|
|
btrfs_async_run_delayed_refs(fs_info,
|
|
trans->delayed_ref_updates * 2,
|
|
trans->transid, 0);
|
|
if (be_nice) {
|
|
if (truncate_space_check(trans, root,
|
|
extent_num_bytes)) {
|
|
should_end = 1;
|
|
}
|
|
if (btrfs_should_throttle_delayed_refs(trans,
|
|
fs_info))
|
|
should_throttle = 1;
|
|
}
|
|
}
|
|
|
|
if (found_type == BTRFS_INODE_ITEM_KEY)
|
|
break;
|
|
|
|
if (path->slots[0] == 0 ||
|
|
path->slots[0] != pending_del_slot ||
|
|
should_throttle || should_end) {
|
|
if (pending_del_nr) {
|
|
ret = btrfs_del_items(trans, root, path,
|
|
pending_del_slot,
|
|
pending_del_nr);
|
|
if (ret) {
|
|
btrfs_abort_transaction(trans, ret);
|
|
goto error;
|
|
}
|
|
pending_del_nr = 0;
|
|
}
|
|
btrfs_release_path(path);
|
|
if (should_throttle) {
|
|
unsigned long updates = trans->delayed_ref_updates;
|
|
if (updates) {
|
|
trans->delayed_ref_updates = 0;
|
|
ret = btrfs_run_delayed_refs(trans,
|
|
fs_info,
|
|
updates * 2);
|
|
if (ret && !err)
|
|
err = ret;
|
|
}
|
|
}
|
|
/*
|
|
* if we failed to refill our space rsv, bail out
|
|
* and let the transaction restart
|
|
*/
|
|
if (should_end) {
|
|
err = -EAGAIN;
|
|
goto error;
|
|
}
|
|
goto search_again;
|
|
} else {
|
|
path->slots[0]--;
|
|
}
|
|
}
|
|
out:
|
|
if (pending_del_nr) {
|
|
ret = btrfs_del_items(trans, root, path, pending_del_slot,
|
|
pending_del_nr);
|
|
if (ret)
|
|
btrfs_abort_transaction(trans, ret);
|
|
}
|
|
error:
|
|
if (root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID)
|
|
btrfs_ordered_update_i_size(inode, last_size, NULL);
|
|
|
|
btrfs_free_path(path);
|
|
|
|
if (err == 0) {
|
|
/* only inline file may have last_size != new_size */
|
|
if (new_size >= fs_info->sectorsize ||
|
|
new_size > fs_info->max_inline)
|
|
ASSERT(last_size == new_size);
|
|
}
|
|
|
|
if (be_nice && bytes_deleted > SZ_32M) {
|
|
unsigned long updates = trans->delayed_ref_updates;
|
|
if (updates) {
|
|
trans->delayed_ref_updates = 0;
|
|
ret = btrfs_run_delayed_refs(trans, fs_info,
|
|
updates * 2);
|
|
if (ret && !err)
|
|
err = ret;
|
|
}
|
|
}
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* btrfs_truncate_block - read, zero a chunk and write a block
|
|
* @inode - inode that we're zeroing
|
|
* @from - the offset to start zeroing
|
|
* @len - the length to zero, 0 to zero the entire range respective to the
|
|
* offset
|
|
* @front - zero up to the offset instead of from the offset on
|
|
*
|
|
* This will find the block for the "from" offset and cow the block and zero the
|
|
* part we want to zero. This is used with truncate and hole punching.
|
|
*/
|
|
int btrfs_truncate_block(struct inode *inode, loff_t from, loff_t len,
|
|
int front)
|
|
{
|
|
struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
|
|
struct address_space *mapping = inode->i_mapping;
|
|
struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
|
|
struct btrfs_ordered_extent *ordered;
|
|
struct extent_state *cached_state = NULL;
|
|
char *kaddr;
|
|
u32 blocksize = fs_info->sectorsize;
|
|
pgoff_t index = from >> PAGE_SHIFT;
|
|
unsigned offset = from & (blocksize - 1);
|
|
struct page *page;
|
|
gfp_t mask = btrfs_alloc_write_mask(mapping);
|
|
int ret = 0;
|
|
u64 block_start;
|
|
u64 block_end;
|
|
|
|
if ((offset & (blocksize - 1)) == 0 &&
|
|
(!len || ((len & (blocksize - 1)) == 0)))
|
|
goto out;
|
|
|
|
ret = btrfs_delalloc_reserve_space(inode,
|
|
round_down(from, blocksize), blocksize);
|
|
if (ret)
|
|
goto out;
|
|
|
|
again:
|
|
page = find_or_create_page(mapping, index, mask);
|
|
if (!page) {
|
|
btrfs_delalloc_release_space(inode,
|
|
round_down(from, blocksize),
|
|
blocksize);
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
block_start = round_down(from, blocksize);
|
|
block_end = block_start + blocksize - 1;
|
|
|
|
if (!PageUptodate(page)) {
|
|
ret = btrfs_readpage(NULL, page);
|
|
lock_page(page);
|
|
if (page->mapping != mapping) {
|
|
unlock_page(page);
|
|
put_page(page);
|
|
goto again;
|
|
}
|
|
if (!PageUptodate(page)) {
|
|
ret = -EIO;
|
|
goto out_unlock;
|
|
}
|
|
}
|
|
wait_on_page_writeback(page);
|
|
|
|
lock_extent_bits(io_tree, block_start, block_end, &cached_state);
|
|
set_page_extent_mapped(page);
|
|
|
|
ordered = btrfs_lookup_ordered_extent(inode, block_start);
|
|
if (ordered) {
|
|
unlock_extent_cached(io_tree, block_start, block_end,
|
|
&cached_state, GFP_NOFS);
|
|
unlock_page(page);
|
|
put_page(page);
|
|
btrfs_start_ordered_extent(inode, ordered, 1);
|
|
btrfs_put_ordered_extent(ordered);
|
|
goto again;
|
|
}
|
|
|
|
clear_extent_bit(&BTRFS_I(inode)->io_tree, block_start, block_end,
|
|
EXTENT_DIRTY | EXTENT_DELALLOC |
|
|
EXTENT_DO_ACCOUNTING | EXTENT_DEFRAG,
|
|
0, 0, &cached_state, GFP_NOFS);
|
|
|
|
ret = btrfs_set_extent_delalloc(inode, block_start, block_end,
|
|
&cached_state, 0);
|
|
if (ret) {
|
|
unlock_extent_cached(io_tree, block_start, block_end,
|
|
&cached_state, GFP_NOFS);
|
|
goto out_unlock;
|
|
}
|
|
|
|
if (offset != blocksize) {
|
|
if (!len)
|
|
len = blocksize - offset;
|
|
kaddr = kmap(page);
|
|
if (front)
|
|
memset(kaddr + (block_start - page_offset(page)),
|
|
0, offset);
|
|
else
|
|
memset(kaddr + (block_start - page_offset(page)) + offset,
|
|
0, len);
|
|
flush_dcache_page(page);
|
|
kunmap(page);
|
|
}
|
|
ClearPageChecked(page);
|
|
set_page_dirty(page);
|
|
unlock_extent_cached(io_tree, block_start, block_end, &cached_state,
|
|
GFP_NOFS);
|
|
|
|
out_unlock:
|
|
if (ret)
|
|
btrfs_delalloc_release_space(inode, block_start,
|
|
blocksize);
|
|
unlock_page(page);
|
|
put_page(page);
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static int maybe_insert_hole(struct btrfs_root *root, struct inode *inode,
|
|
u64 offset, u64 len)
|
|
{
|
|
struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
|
|
struct btrfs_trans_handle *trans;
|
|
int ret;
|
|
|
|
/*
|
|
* Still need to make sure the inode looks like it's been updated so
|
|
* that any holes get logged if we fsync.
|
|
*/
|
|
if (btrfs_fs_incompat(fs_info, NO_HOLES)) {
|
|
BTRFS_I(inode)->last_trans = fs_info->generation;
|
|
BTRFS_I(inode)->last_sub_trans = root->log_transid;
|
|
BTRFS_I(inode)->last_log_commit = root->last_log_commit;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* 1 - for the one we're dropping
|
|
* 1 - for the one we're adding
|
|
* 1 - for updating the inode.
|
|
*/
|
|
trans = btrfs_start_transaction(root, 3);
|
|
if (IS_ERR(trans))
|
|
return PTR_ERR(trans);
|
|
|
|
ret = btrfs_drop_extents(trans, root, inode, offset, offset + len, 1);
|
|
if (ret) {
|
|
btrfs_abort_transaction(trans, ret);
|
|
btrfs_end_transaction(trans);
|
|
return ret;
|
|
}
|
|
|
|
ret = btrfs_insert_file_extent(trans, root, btrfs_ino(BTRFS_I(inode)),
|
|
offset, 0, 0, len, 0, len, 0, 0, 0);
|
|
if (ret)
|
|
btrfs_abort_transaction(trans, ret);
|
|
else
|
|
btrfs_update_inode(trans, root, inode);
|
|
btrfs_end_transaction(trans);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* This function puts in dummy file extents for the area we're creating a hole
|
|
* for. So if we are truncating this file to a larger size we need to insert
|
|
* these file extents so that btrfs_get_extent will return a EXTENT_MAP_HOLE for
|
|
* the range between oldsize and size
|
|
*/
|
|
int btrfs_cont_expand(struct inode *inode, loff_t oldsize, loff_t size)
|
|
{
|
|
struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
|
|
struct btrfs_root *root = BTRFS_I(inode)->root;
|
|
struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
|
|
struct extent_map *em = NULL;
|
|
struct extent_state *cached_state = NULL;
|
|
struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
|
|
u64 hole_start = ALIGN(oldsize, fs_info->sectorsize);
|
|
u64 block_end = ALIGN(size, fs_info->sectorsize);
|
|
u64 last_byte;
|
|
u64 cur_offset;
|
|
u64 hole_size;
|
|
int err = 0;
|
|
|
|
/*
|
|
* If our size started in the middle of a block we need to zero out the
|
|
* rest of the block before we expand the i_size, otherwise we could
|
|
* expose stale data.
|
|
*/
|
|
err = btrfs_truncate_block(inode, oldsize, 0, 0);
|
|
if (err)
|
|
return err;
|
|
|
|
if (size <= hole_start)
|
|
return 0;
|
|
|
|
while (1) {
|
|
struct btrfs_ordered_extent *ordered;
|
|
|
|
lock_extent_bits(io_tree, hole_start, block_end - 1,
|
|
&cached_state);
|
|
ordered = btrfs_lookup_ordered_range(BTRFS_I(inode), hole_start,
|
|
block_end - hole_start);
|
|
if (!ordered)
|
|
break;
|
|
unlock_extent_cached(io_tree, hole_start, block_end - 1,
|
|
&cached_state, GFP_NOFS);
|
|
btrfs_start_ordered_extent(inode, ordered, 1);
|
|
btrfs_put_ordered_extent(ordered);
|
|
}
|
|
|
|
cur_offset = hole_start;
|
|
while (1) {
|
|
em = btrfs_get_extent(inode, NULL, 0, cur_offset,
|
|
block_end - cur_offset, 0);
|
|
if (IS_ERR(em)) {
|
|
err = PTR_ERR(em);
|
|
em = NULL;
|
|
break;
|
|
}
|
|
last_byte = min(extent_map_end(em), block_end);
|
|
last_byte = ALIGN(last_byte, fs_info->sectorsize);
|
|
if (!test_bit(EXTENT_FLAG_PREALLOC, &em->flags)) {
|
|
struct extent_map *hole_em;
|
|
hole_size = last_byte - cur_offset;
|
|
|
|
err = maybe_insert_hole(root, inode, cur_offset,
|
|
hole_size);
|
|
if (err)
|
|
break;
|
|
btrfs_drop_extent_cache(BTRFS_I(inode), cur_offset,
|
|
cur_offset + hole_size - 1, 0);
|
|
hole_em = alloc_extent_map();
|
|
if (!hole_em) {
|
|
set_bit(BTRFS_INODE_NEEDS_FULL_SYNC,
|
|
&BTRFS_I(inode)->runtime_flags);
|
|
goto next;
|
|
}
|
|
hole_em->start = cur_offset;
|
|
hole_em->len = hole_size;
|
|
hole_em->orig_start = cur_offset;
|
|
|
|
hole_em->block_start = EXTENT_MAP_HOLE;
|
|
hole_em->block_len = 0;
|
|
hole_em->orig_block_len = 0;
|
|
hole_em->ram_bytes = hole_size;
|
|
hole_em->bdev = fs_info->fs_devices->latest_bdev;
|
|
hole_em->compress_type = BTRFS_COMPRESS_NONE;
|
|
hole_em->generation = fs_info->generation;
|
|
|
|
while (1) {
|
|
write_lock(&em_tree->lock);
|
|
err = add_extent_mapping(em_tree, hole_em, 1);
|
|
write_unlock(&em_tree->lock);
|
|
if (err != -EEXIST)
|
|
break;
|
|
btrfs_drop_extent_cache(BTRFS_I(inode),
|
|
cur_offset,
|
|
cur_offset +
|
|
hole_size - 1, 0);
|
|
}
|
|
free_extent_map(hole_em);
|
|
}
|
|
next:
|
|
free_extent_map(em);
|
|
em = NULL;
|
|
cur_offset = last_byte;
|
|
if (cur_offset >= block_end)
|
|
break;
|
|
}
|
|
free_extent_map(em);
|
|
unlock_extent_cached(io_tree, hole_start, block_end - 1, &cached_state,
|
|
GFP_NOFS);
|
|
return err;
|
|
}
|
|
|
|
static int btrfs_setsize(struct inode *inode, struct iattr *attr)
|
|
{
|
|
struct btrfs_root *root = BTRFS_I(inode)->root;
|
|
struct btrfs_trans_handle *trans;
|
|
loff_t oldsize = i_size_read(inode);
|
|
loff_t newsize = attr->ia_size;
|
|
int mask = attr->ia_valid;
|
|
int ret;
|
|
|
|
/*
|
|
* The regular truncate() case without ATTR_CTIME and ATTR_MTIME is a
|
|
* special case where we need to update the times despite not having
|
|
* these flags set. For all other operations the VFS set these flags
|
|
* explicitly if it wants a timestamp update.
|
|
*/
|
|
if (newsize != oldsize) {
|
|
inode_inc_iversion(inode);
|
|
if (!(mask & (ATTR_CTIME | ATTR_MTIME)))
|
|
inode->i_ctime = inode->i_mtime =
|
|
current_time(inode);
|
|
}
|
|
|
|
if (newsize > oldsize) {
|
|
/*
|
|
* Don't do an expanding truncate while snapshoting is ongoing.
|
|
* This is to ensure the snapshot captures a fully consistent
|
|
* state of this file - if the snapshot captures this expanding
|
|
* truncation, it must capture all writes that happened before
|
|
* this truncation.
|
|
*/
|
|
btrfs_wait_for_snapshot_creation(root);
|
|
ret = btrfs_cont_expand(inode, oldsize, newsize);
|
|
if (ret) {
|
|
btrfs_end_write_no_snapshoting(root);
|
|
return ret;
|
|
}
|
|
|
|
trans = btrfs_start_transaction(root, 1);
|
|
if (IS_ERR(trans)) {
|
|
btrfs_end_write_no_snapshoting(root);
|
|
return PTR_ERR(trans);
|
|
}
|
|
|
|
i_size_write(inode, newsize);
|
|
btrfs_ordered_update_i_size(inode, i_size_read(inode), NULL);
|
|
pagecache_isize_extended(inode, oldsize, newsize);
|
|
ret = btrfs_update_inode(trans, root, inode);
|
|
btrfs_end_write_no_snapshoting(root);
|
|
btrfs_end_transaction(trans);
|
|
} else {
|
|
|
|
/*
|
|
* We're truncating a file that used to have good data down to
|
|
* zero. Make sure it gets into the ordered flush list so that
|
|
* any new writes get down to disk quickly.
|
|
*/
|
|
if (newsize == 0)
|
|
set_bit(BTRFS_INODE_ORDERED_DATA_CLOSE,
|
|
&BTRFS_I(inode)->runtime_flags);
|
|
|
|
/*
|
|
* 1 for the orphan item we're going to add
|
|
* 1 for the orphan item deletion.
|
|
*/
|
|
trans = btrfs_start_transaction(root, 2);
|
|
if (IS_ERR(trans))
|
|
return PTR_ERR(trans);
|
|
|
|
/*
|
|
* We need to do this in case we fail at _any_ point during the
|
|
* actual truncate. Once we do the truncate_setsize we could
|
|
* invalidate pages which forces any outstanding ordered io to
|
|
* be instantly completed which will give us extents that need
|
|
* to be truncated. If we fail to get an orphan inode down we
|
|
* could have left over extents that were never meant to live,
|
|
* so we need to guarantee from this point on that everything
|
|
* will be consistent.
|
|
*/
|
|
ret = btrfs_orphan_add(trans, inode);
|
|
btrfs_end_transaction(trans);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/* we don't support swapfiles, so vmtruncate shouldn't fail */
|
|
truncate_setsize(inode, newsize);
|
|
|
|
/* Disable nonlocked read DIO to avoid the end less truncate */
|
|
btrfs_inode_block_unlocked_dio(inode);
|
|
inode_dio_wait(inode);
|
|
btrfs_inode_resume_unlocked_dio(inode);
|
|
|
|
ret = btrfs_truncate(inode);
|
|
if (ret && inode->i_nlink) {
|
|
int err;
|
|
|
|
/* To get a stable disk_i_size */
|
|
err = btrfs_wait_ordered_range(inode, 0, (u64)-1);
|
|
if (err) {
|
|
btrfs_orphan_del(NULL, inode);
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* failed to truncate, disk_i_size is only adjusted down
|
|
* as we remove extents, so it should represent the true
|
|
* size of the inode, so reset the in memory size and
|
|
* delete our orphan entry.
|
|
*/
|
|
trans = btrfs_join_transaction(root);
|
|
if (IS_ERR(trans)) {
|
|
btrfs_orphan_del(NULL, inode);
|
|
return ret;
|
|
}
|
|
i_size_write(inode, BTRFS_I(inode)->disk_i_size);
|
|
err = btrfs_orphan_del(trans, inode);
|
|
if (err)
|
|
btrfs_abort_transaction(trans, err);
|
|
btrfs_end_transaction(trans);
|
|
}
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int btrfs_setattr(struct dentry *dentry, struct iattr *attr)
|
|
{
|
|
struct inode *inode = d_inode(dentry);
|
|
struct btrfs_root *root = BTRFS_I(inode)->root;
|
|
int err;
|
|
|
|
if (btrfs_root_readonly(root))
|
|
return -EROFS;
|
|
|
|
err = setattr_prepare(dentry, attr);
|
|
if (err)
|
|
return err;
|
|
|
|
if (S_ISREG(inode->i_mode) && (attr->ia_valid & ATTR_SIZE)) {
|
|
err = btrfs_setsize(inode, attr);
|
|
if (err)
|
|
return err;
|
|
}
|
|
|
|
if (attr->ia_valid) {
|
|
setattr_copy(inode, attr);
|
|
inode_inc_iversion(inode);
|
|
err = btrfs_dirty_inode(inode);
|
|
|
|
if (!err && attr->ia_valid & ATTR_MODE)
|
|
err = posix_acl_chmod(inode, inode->i_mode);
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* While truncating the inode pages during eviction, we get the VFS calling
|
|
* btrfs_invalidatepage() against each page of the inode. This is slow because
|
|
* the calls to btrfs_invalidatepage() result in a huge amount of calls to
|
|
* lock_extent_bits() and clear_extent_bit(), which keep merging and splitting
|
|
* extent_state structures over and over, wasting lots of time.
|
|
*
|
|
* Therefore if the inode is being evicted, let btrfs_invalidatepage() skip all
|
|
* those expensive operations on a per page basis and do only the ordered io
|
|
* finishing, while we release here the extent_map and extent_state structures,
|
|
* without the excessive merging and splitting.
|
|
*/
|
|
static void evict_inode_truncate_pages(struct inode *inode)
|
|
{
|
|
struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
|
|
struct extent_map_tree *map_tree = &BTRFS_I(inode)->extent_tree;
|
|
struct rb_node *node;
|
|
|
|
ASSERT(inode->i_state & I_FREEING);
|
|
truncate_inode_pages_final(&inode->i_data);
|
|
|
|
write_lock(&map_tree->lock);
|
|
while (!RB_EMPTY_ROOT(&map_tree->map)) {
|
|
struct extent_map *em;
|
|
|
|
node = rb_first(&map_tree->map);
|
|
em = rb_entry(node, struct extent_map, rb_node);
|
|
clear_bit(EXTENT_FLAG_PINNED, &em->flags);
|
|
clear_bit(EXTENT_FLAG_LOGGING, &em->flags);
|
|
remove_extent_mapping(map_tree, em);
|
|
free_extent_map(em);
|
|
if (need_resched()) {
|
|
write_unlock(&map_tree->lock);
|
|
cond_resched();
|
|
write_lock(&map_tree->lock);
|
|
}
|
|
}
|
|
write_unlock(&map_tree->lock);
|
|
|
|
/*
|
|
* Keep looping until we have no more ranges in the io tree.
|
|
* We can have ongoing bios started by readpages (called from readahead)
|
|
* that have their endio callback (extent_io.c:end_bio_extent_readpage)
|
|
* still in progress (unlocked the pages in the bio but did not yet
|
|
* unlocked the ranges in the io tree). Therefore this means some
|
|
* ranges can still be locked and eviction started because before
|
|
* submitting those bios, which are executed by a separate task (work
|
|
* queue kthread), inode references (inode->i_count) were not taken
|
|
* (which would be dropped in the end io callback of each bio).
|
|
* Therefore here we effectively end up waiting for those bios and
|
|
* anyone else holding locked ranges without having bumped the inode's
|
|
* reference count - if we don't do it, when they access the inode's
|
|
* io_tree to unlock a range it may be too late, leading to an
|
|
* use-after-free issue.
|
|
*/
|
|
spin_lock(&io_tree->lock);
|
|
while (!RB_EMPTY_ROOT(&io_tree->state)) {
|
|
struct extent_state *state;
|
|
struct extent_state *cached_state = NULL;
|
|
u64 start;
|
|
u64 end;
|
|
|
|
node = rb_first(&io_tree->state);
|
|
state = rb_entry(node, struct extent_state, rb_node);
|
|
start = state->start;
|
|
end = state->end;
|
|
spin_unlock(&io_tree->lock);
|
|
|
|
lock_extent_bits(io_tree, start, end, &cached_state);
|
|
|
|
/*
|
|
* If still has DELALLOC flag, the extent didn't reach disk,
|
|
* and its reserved space won't be freed by delayed_ref.
|
|
* So we need to free its reserved space here.
|
|
* (Refer to comment in btrfs_invalidatepage, case 2)
|
|
*
|
|
* Note, end is the bytenr of last byte, so we need + 1 here.
|
|
*/
|
|
if (state->state & EXTENT_DELALLOC)
|
|
btrfs_qgroup_free_data(inode, start, end - start + 1);
|
|
|
|
clear_extent_bit(io_tree, start, end,
|
|
EXTENT_LOCKED | EXTENT_DIRTY |
|
|
EXTENT_DELALLOC | EXTENT_DO_ACCOUNTING |
|
|
EXTENT_DEFRAG, 1, 1,
|
|
&cached_state, GFP_NOFS);
|
|
|
|
cond_resched();
|
|
spin_lock(&io_tree->lock);
|
|
}
|
|
spin_unlock(&io_tree->lock);
|
|
}
|
|
|
|
void btrfs_evict_inode(struct inode *inode)
|
|
{
|
|
struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
|
|
struct btrfs_trans_handle *trans;
|
|
struct btrfs_root *root = BTRFS_I(inode)->root;
|
|
struct btrfs_block_rsv *rsv, *global_rsv;
|
|
int steal_from_global = 0;
|
|
u64 min_size;
|
|
int ret;
|
|
|
|
trace_btrfs_inode_evict(inode);
|
|
|
|
if (!root) {
|
|
kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode));
|
|
return;
|
|
}
|
|
|
|
min_size = btrfs_calc_trunc_metadata_size(fs_info, 1);
|
|
|
|
evict_inode_truncate_pages(inode);
|
|
|
|
if (inode->i_nlink &&
|
|
((btrfs_root_refs(&root->root_item) != 0 &&
|
|
root->root_key.objectid != BTRFS_ROOT_TREE_OBJECTID) ||
|
|
btrfs_is_free_space_inode(BTRFS_I(inode))))
|
|
goto no_delete;
|
|
|
|
if (is_bad_inode(inode)) {
|
|
btrfs_orphan_del(NULL, inode);
|
|
goto no_delete;
|
|
}
|
|
/* do we really want it for ->i_nlink > 0 and zero btrfs_root_refs? */
|
|
if (!special_file(inode->i_mode))
|
|
btrfs_wait_ordered_range(inode, 0, (u64)-1);
|
|
|
|
btrfs_free_io_failure_record(inode, 0, (u64)-1);
|
|
|
|
if (test_bit(BTRFS_FS_LOG_RECOVERING, &fs_info->flags)) {
|
|
BUG_ON(test_bit(BTRFS_INODE_HAS_ORPHAN_ITEM,
|
|
&BTRFS_I(inode)->runtime_flags));
|
|
goto no_delete;
|
|
}
|
|
|
|
if (inode->i_nlink > 0) {
|
|
BUG_ON(btrfs_root_refs(&root->root_item) != 0 &&
|
|
root->root_key.objectid != BTRFS_ROOT_TREE_OBJECTID);
|
|
goto no_delete;
|
|
}
|
|
|
|
ret = btrfs_commit_inode_delayed_inode(BTRFS_I(inode));
|
|
if (ret) {
|
|
btrfs_orphan_del(NULL, inode);
|
|
goto no_delete;
|
|
}
|
|
|
|
rsv = btrfs_alloc_block_rsv(fs_info, BTRFS_BLOCK_RSV_TEMP);
|
|
if (!rsv) {
|
|
btrfs_orphan_del(NULL, inode);
|
|
goto no_delete;
|
|
}
|
|
rsv->size = min_size;
|
|
rsv->failfast = 1;
|
|
global_rsv = &fs_info->global_block_rsv;
|
|
|
|
btrfs_i_size_write(BTRFS_I(inode), 0);
|
|
|
|
/*
|
|
* This is a bit simpler than btrfs_truncate since we've already
|
|
* reserved our space for our orphan item in the unlink, so we just
|
|
* need to reserve some slack space in case we add bytes and update
|
|
* inode item when doing the truncate.
|
|
*/
|
|
while (1) {
|
|
ret = btrfs_block_rsv_refill(root, rsv, min_size,
|
|
BTRFS_RESERVE_FLUSH_LIMIT);
|
|
|
|
/*
|
|
* Try and steal from the global reserve since we will
|
|
* likely not use this space anyway, we want to try as
|
|
* hard as possible to get this to work.
|
|
*/
|
|
if (ret)
|
|
steal_from_global++;
|
|
else
|
|
steal_from_global = 0;
|
|
ret = 0;
|
|
|
|
/*
|
|
* steal_from_global == 0: we reserved stuff, hooray!
|
|
* steal_from_global == 1: we didn't reserve stuff, boo!
|
|
* steal_from_global == 2: we've committed, still not a lot of
|
|
* room but maybe we'll have room in the global reserve this
|
|
* time.
|
|
* steal_from_global == 3: abandon all hope!
|
|
*/
|
|
if (steal_from_global > 2) {
|
|
btrfs_warn(fs_info,
|
|
"Could not get space for a delete, will truncate on mount %d",
|
|
ret);
|
|
btrfs_orphan_del(NULL, inode);
|
|
btrfs_free_block_rsv(fs_info, rsv);
|
|
goto no_delete;
|
|
}
|
|
|
|
trans = btrfs_join_transaction(root);
|
|
if (IS_ERR(trans)) {
|
|
btrfs_orphan_del(NULL, inode);
|
|
btrfs_free_block_rsv(fs_info, rsv);
|
|
goto no_delete;
|
|
}
|
|
|
|
/*
|
|
* We can't just steal from the global reserve, we need to make
|
|
* sure there is room to do it, if not we need to commit and try
|
|
* again.
|
|
*/
|
|
if (steal_from_global) {
|
|
if (!btrfs_check_space_for_delayed_refs(trans, fs_info))
|
|
ret = btrfs_block_rsv_migrate(global_rsv, rsv,
|
|
min_size, 0);
|
|
else
|
|
ret = -ENOSPC;
|
|
}
|
|
|
|
/*
|
|
* Couldn't steal from the global reserve, we have too much
|
|
* pending stuff built up, commit the transaction and try it
|
|
* again.
|
|
*/
|
|
if (ret) {
|
|
ret = btrfs_commit_transaction(trans);
|
|
if (ret) {
|
|
btrfs_orphan_del(NULL, inode);
|
|
btrfs_free_block_rsv(fs_info, rsv);
|
|
goto no_delete;
|
|
}
|
|
continue;
|
|
} else {
|
|
steal_from_global = 0;
|
|
}
|
|
|
|
trans->block_rsv = rsv;
|
|
|
|
ret = btrfs_truncate_inode_items(trans, root, inode, 0, 0);
|
|
if (ret != -ENOSPC && ret != -EAGAIN)
|
|
break;
|
|
|
|
trans->block_rsv = &fs_info->trans_block_rsv;
|
|
btrfs_end_transaction(trans);
|
|
trans = NULL;
|
|
btrfs_btree_balance_dirty(fs_info);
|
|
}
|
|
|
|
btrfs_free_block_rsv(fs_info, rsv);
|
|
|
|
/*
|
|
* Errors here aren't a big deal, it just means we leave orphan items
|
|
* in the tree. They will be cleaned up on the next mount.
|
|
*/
|
|
if (ret == 0) {
|
|
trans->block_rsv = root->orphan_block_rsv;
|
|
btrfs_orphan_del(trans, inode);
|
|
} else {
|
|
btrfs_orphan_del(NULL, inode);
|
|
}
|
|
|
|
trans->block_rsv = &fs_info->trans_block_rsv;
|
|
if (!(root == fs_info->tree_root ||
|
|
root->root_key.objectid == BTRFS_TREE_RELOC_OBJECTID))
|
|
btrfs_return_ino(root, btrfs_ino(BTRFS_I(inode)));
|
|
|
|
btrfs_end_transaction(trans);
|
|
btrfs_btree_balance_dirty(fs_info);
|
|
no_delete:
|
|
btrfs_remove_delayed_node(BTRFS_I(inode));
|
|
clear_inode(inode);
|
|
}
|
|
|
|
/*
|
|
* this returns the key found in the dir entry in the location pointer.
|
|
* If no dir entries were found, location->objectid is 0.
|
|
*/
|
|
static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry,
|
|
struct btrfs_key *location)
|
|
{
|
|
const char *name = dentry->d_name.name;
|
|
int namelen = dentry->d_name.len;
|
|
struct btrfs_dir_item *di;
|
|
struct btrfs_path *path;
|
|
struct btrfs_root *root = BTRFS_I(dir)->root;
|
|
int ret = 0;
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
|
|
di = btrfs_lookup_dir_item(NULL, root, path, btrfs_ino(BTRFS_I(dir)),
|
|
name, namelen, 0);
|
|
if (IS_ERR(di))
|
|
ret = PTR_ERR(di);
|
|
|
|
if (IS_ERR_OR_NULL(di))
|
|
goto out_err;
|
|
|
|
btrfs_dir_item_key_to_cpu(path->nodes[0], di, location);
|
|
out:
|
|
btrfs_free_path(path);
|
|
return ret;
|
|
out_err:
|
|
location->objectid = 0;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* when we hit a tree root in a directory, the btrfs part of the inode
|
|
* needs to be changed to reflect the root directory of the tree root. This
|
|
* is kind of like crossing a mount point.
|
|
*/
|
|
static int fixup_tree_root_location(struct btrfs_fs_info *fs_info,
|
|
struct inode *dir,
|
|
struct dentry *dentry,
|
|
struct btrfs_key *location,
|
|
struct btrfs_root **sub_root)
|
|
{
|
|
struct btrfs_path *path;
|
|
struct btrfs_root *new_root;
|
|
struct btrfs_root_ref *ref;
|
|
struct extent_buffer *leaf;
|
|
struct btrfs_key key;
|
|
int ret;
|
|
int err = 0;
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path) {
|
|
err = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
err = -ENOENT;
|
|
key.objectid = BTRFS_I(dir)->root->root_key.objectid;
|
|
key.type = BTRFS_ROOT_REF_KEY;
|
|
key.offset = location->objectid;
|
|
|
|
ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0);
|
|
if (ret) {
|
|
if (ret < 0)
|
|
err = ret;
|
|
goto out;
|
|
}
|
|
|
|
leaf = path->nodes[0];
|
|
ref = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_root_ref);
|
|
if (btrfs_root_ref_dirid(leaf, ref) != btrfs_ino(BTRFS_I(dir)) ||
|
|
btrfs_root_ref_name_len(leaf, ref) != dentry->d_name.len)
|
|
goto out;
|
|
|
|
ret = memcmp_extent_buffer(leaf, dentry->d_name.name,
|
|
(unsigned long)(ref + 1),
|
|
dentry->d_name.len);
|
|
if (ret)
|
|
goto out;
|
|
|
|
btrfs_release_path(path);
|
|
|
|
new_root = btrfs_read_fs_root_no_name(fs_info, location);
|
|
if (IS_ERR(new_root)) {
|
|
err = PTR_ERR(new_root);
|
|
goto out;
|
|
}
|
|
|
|
*sub_root = new_root;
|
|
location->objectid = btrfs_root_dirid(&new_root->root_item);
|
|
location->type = BTRFS_INODE_ITEM_KEY;
|
|
location->offset = 0;
|
|
err = 0;
|
|
out:
|
|
btrfs_free_path(path);
|
|
return err;
|
|
}
|
|
|
|
static void inode_tree_add(struct inode *inode)
|
|
{
|
|
struct btrfs_root *root = BTRFS_I(inode)->root;
|
|
struct btrfs_inode *entry;
|
|
struct rb_node **p;
|
|
struct rb_node *parent;
|
|
struct rb_node *new = &BTRFS_I(inode)->rb_node;
|
|
u64 ino = btrfs_ino(BTRFS_I(inode));
|
|
|
|
if (inode_unhashed(inode))
|
|
return;
|
|
parent = NULL;
|
|
spin_lock(&root->inode_lock);
|
|
p = &root->inode_tree.rb_node;
|
|
while (*p) {
|
|
parent = *p;
|
|
entry = rb_entry(parent, struct btrfs_inode, rb_node);
|
|
|
|
if (ino < btrfs_ino(BTRFS_I(&entry->vfs_inode)))
|
|
p = &parent->rb_left;
|
|
else if (ino > btrfs_ino(BTRFS_I(&entry->vfs_inode)))
|
|
p = &parent->rb_right;
|
|
else {
|
|
WARN_ON(!(entry->vfs_inode.i_state &
|
|
(I_WILL_FREE | I_FREEING)));
|
|
rb_replace_node(parent, new, &root->inode_tree);
|
|
RB_CLEAR_NODE(parent);
|
|
spin_unlock(&root->inode_lock);
|
|
return;
|
|
}
|
|
}
|
|
rb_link_node(new, parent, p);
|
|
rb_insert_color(new, &root->inode_tree);
|
|
spin_unlock(&root->inode_lock);
|
|
}
|
|
|
|
static void inode_tree_del(struct inode *inode)
|
|
{
|
|
struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
|
|
struct btrfs_root *root = BTRFS_I(inode)->root;
|
|
int empty = 0;
|
|
|
|
spin_lock(&root->inode_lock);
|
|
if (!RB_EMPTY_NODE(&BTRFS_I(inode)->rb_node)) {
|
|
rb_erase(&BTRFS_I(inode)->rb_node, &root->inode_tree);
|
|
RB_CLEAR_NODE(&BTRFS_I(inode)->rb_node);
|
|
empty = RB_EMPTY_ROOT(&root->inode_tree);
|
|
}
|
|
spin_unlock(&root->inode_lock);
|
|
|
|
if (empty && btrfs_root_refs(&root->root_item) == 0) {
|
|
synchronize_srcu(&fs_info->subvol_srcu);
|
|
spin_lock(&root->inode_lock);
|
|
empty = RB_EMPTY_ROOT(&root->inode_tree);
|
|
spin_unlock(&root->inode_lock);
|
|
if (empty)
|
|
btrfs_add_dead_root(root);
|
|
}
|
|
}
|
|
|
|
void btrfs_invalidate_inodes(struct btrfs_root *root)
|
|
{
|
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
|
struct rb_node *node;
|
|
struct rb_node *prev;
|
|
struct btrfs_inode *entry;
|
|
struct inode *inode;
|
|
u64 objectid = 0;
|
|
|
|
if (!test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state))
|
|
WARN_ON(btrfs_root_refs(&root->root_item) != 0);
|
|
|
|
spin_lock(&root->inode_lock);
|
|
again:
|
|
node = root->inode_tree.rb_node;
|
|
prev = NULL;
|
|
while (node) {
|
|
prev = node;
|
|
entry = rb_entry(node, struct btrfs_inode, rb_node);
|
|
|
|
if (objectid < btrfs_ino(BTRFS_I(&entry->vfs_inode)))
|
|
node = node->rb_left;
|
|
else if (objectid > btrfs_ino(BTRFS_I(&entry->vfs_inode)))
|
|
node = node->rb_right;
|
|
else
|
|
break;
|
|
}
|
|
if (!node) {
|
|
while (prev) {
|
|
entry = rb_entry(prev, struct btrfs_inode, rb_node);
|
|
if (objectid <= btrfs_ino(BTRFS_I(&entry->vfs_inode))) {
|
|
node = prev;
|
|
break;
|
|
}
|
|
prev = rb_next(prev);
|
|
}
|
|
}
|
|
while (node) {
|
|
entry = rb_entry(node, struct btrfs_inode, rb_node);
|
|
objectid = btrfs_ino(BTRFS_I(&entry->vfs_inode)) + 1;
|
|
inode = igrab(&entry->vfs_inode);
|
|
if (inode) {
|
|
spin_unlock(&root->inode_lock);
|
|
if (atomic_read(&inode->i_count) > 1)
|
|
d_prune_aliases(inode);
|
|
/*
|
|
* btrfs_drop_inode will have it removed from
|
|
* the inode cache when its usage count
|
|
* hits zero.
|
|
*/
|
|
iput(inode);
|
|
cond_resched();
|
|
spin_lock(&root->inode_lock);
|
|
goto again;
|
|
}
|
|
|
|
if (cond_resched_lock(&root->inode_lock))
|
|
goto again;
|
|
|
|
node = rb_next(node);
|
|
}
|
|
spin_unlock(&root->inode_lock);
|
|
}
|
|
|
|
static int btrfs_init_locked_inode(struct inode *inode, void *p)
|
|
{
|
|
struct btrfs_iget_args *args = p;
|
|
inode->i_ino = args->location->objectid;
|
|
memcpy(&BTRFS_I(inode)->location, args->location,
|
|
sizeof(*args->location));
|
|
BTRFS_I(inode)->root = args->root;
|
|
return 0;
|
|
}
|
|
|
|
static int btrfs_find_actor(struct inode *inode, void *opaque)
|
|
{
|
|
struct btrfs_iget_args *args = opaque;
|
|
return args->location->objectid == BTRFS_I(inode)->location.objectid &&
|
|
args->root == BTRFS_I(inode)->root;
|
|
}
|
|
|
|
static struct inode *btrfs_iget_locked(struct super_block *s,
|
|
struct btrfs_key *location,
|
|
struct btrfs_root *root)
|
|
{
|
|
struct inode *inode;
|
|
struct btrfs_iget_args args;
|
|
unsigned long hashval = btrfs_inode_hash(location->objectid, root);
|
|
|
|
args.location = location;
|
|
args.root = root;
|
|
|
|
inode = iget5_locked(s, hashval, btrfs_find_actor,
|
|
btrfs_init_locked_inode,
|
|
(void *)&args);
|
|
return inode;
|
|
}
|
|
|
|
/* Get an inode object given its location and corresponding root.
|
|
* Returns in *is_new if the inode was read from disk
|
|
*/
|
|
struct inode *btrfs_iget(struct super_block *s, struct btrfs_key *location,
|
|
struct btrfs_root *root, int *new)
|
|
{
|
|
struct inode *inode;
|
|
|
|
inode = btrfs_iget_locked(s, location, root);
|
|
if (!inode)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
if (inode->i_state & I_NEW) {
|
|
int ret;
|
|
|
|
ret = btrfs_read_locked_inode(inode);
|
|
if (!is_bad_inode(inode)) {
|
|
inode_tree_add(inode);
|
|
unlock_new_inode(inode);
|
|
if (new)
|
|
*new = 1;
|
|
} else {
|
|
unlock_new_inode(inode);
|
|
iput(inode);
|
|
ASSERT(ret < 0);
|
|
inode = ERR_PTR(ret < 0 ? ret : -ESTALE);
|
|
}
|
|
}
|
|
|
|
return inode;
|
|
}
|
|
|
|
static struct inode *new_simple_dir(struct super_block *s,
|
|
struct btrfs_key *key,
|
|
struct btrfs_root *root)
|
|
{
|
|
struct inode *inode = new_inode(s);
|
|
|
|
if (!inode)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
BTRFS_I(inode)->root = root;
|
|
memcpy(&BTRFS_I(inode)->location, key, sizeof(*key));
|
|
set_bit(BTRFS_INODE_DUMMY, &BTRFS_I(inode)->runtime_flags);
|
|
|
|
inode->i_ino = BTRFS_EMPTY_SUBVOL_DIR_OBJECTID;
|
|
inode->i_op = &btrfs_dir_ro_inode_operations;
|
|
inode->i_opflags &= ~IOP_XATTR;
|
|
inode->i_fop = &simple_dir_operations;
|
|
inode->i_mode = S_IFDIR | S_IRUGO | S_IWUSR | S_IXUGO;
|
|
inode->i_mtime = current_time(inode);
|
|
inode->i_atime = inode->i_mtime;
|
|
inode->i_ctime = inode->i_mtime;
|
|
BTRFS_I(inode)->i_otime = inode->i_mtime;
|
|
|
|
return inode;
|
|
}
|
|
|
|
struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry)
|
|
{
|
|
struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb);
|
|
struct inode *inode;
|
|
struct btrfs_root *root = BTRFS_I(dir)->root;
|
|
struct btrfs_root *sub_root = root;
|
|
struct btrfs_key location;
|
|
int index;
|
|
int ret = 0;
|
|
|
|
if (dentry->d_name.len > BTRFS_NAME_LEN)
|
|
return ERR_PTR(-ENAMETOOLONG);
|
|
|
|
ret = btrfs_inode_by_name(dir, dentry, &location);
|
|
if (ret < 0)
|
|
return ERR_PTR(ret);
|
|
|
|
if (location.objectid == 0)
|
|
return ERR_PTR(-ENOENT);
|
|
|
|
if (location.type == BTRFS_INODE_ITEM_KEY) {
|
|
inode = btrfs_iget(dir->i_sb, &location, root, NULL);
|
|
return inode;
|
|
}
|
|
|
|
BUG_ON(location.type != BTRFS_ROOT_ITEM_KEY);
|
|
|
|
index = srcu_read_lock(&fs_info->subvol_srcu);
|
|
ret = fixup_tree_root_location(fs_info, dir, dentry,
|
|
&location, &sub_root);
|
|
if (ret < 0) {
|
|
if (ret != -ENOENT)
|
|
inode = ERR_PTR(ret);
|
|
else
|
|
inode = new_simple_dir(dir->i_sb, &location, sub_root);
|
|
} else {
|
|
inode = btrfs_iget(dir->i_sb, &location, sub_root, NULL);
|
|
}
|
|
srcu_read_unlock(&fs_info->subvol_srcu, index);
|
|
|
|
if (!IS_ERR(inode) && root != sub_root) {
|
|
down_read(&fs_info->cleanup_work_sem);
|
|
if (!(inode->i_sb->s_flags & MS_RDONLY))
|
|
ret = btrfs_orphan_cleanup(sub_root);
|
|
up_read(&fs_info->cleanup_work_sem);
|
|
if (ret) {
|
|
iput(inode);
|
|
inode = ERR_PTR(ret);
|
|
}
|
|
}
|
|
|
|
return inode;
|
|
}
|
|
|
|
static int btrfs_dentry_delete(const struct dentry *dentry)
|
|
{
|
|
struct btrfs_root *root;
|
|
struct inode *inode = d_inode(dentry);
|
|
|
|
if (!inode && !IS_ROOT(dentry))
|
|
inode = d_inode(dentry->d_parent);
|
|
|
|
if (inode) {
|
|
root = BTRFS_I(inode)->root;
|
|
if (btrfs_root_refs(&root->root_item) == 0)
|
|
return 1;
|
|
|
|
if (btrfs_ino(BTRFS_I(inode)) == BTRFS_EMPTY_SUBVOL_DIR_OBJECTID)
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void btrfs_dentry_release(struct dentry *dentry)
|
|
{
|
|
kfree(dentry->d_fsdata);
|
|
}
|
|
|
|
static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry,
|
|
unsigned int flags)
|
|
{
|
|
struct inode *inode;
|
|
|
|
inode = btrfs_lookup_dentry(dir, dentry);
|
|
if (IS_ERR(inode)) {
|
|
if (PTR_ERR(inode) == -ENOENT)
|
|
inode = NULL;
|
|
else
|
|
return ERR_CAST(inode);
|
|
}
|
|
|
|
return d_splice_alias(inode, dentry);
|
|
}
|
|
|
|
unsigned char btrfs_filetype_table[] = {
|
|
DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
|
|
};
|
|
|
|
static int btrfs_real_readdir(struct file *file, struct dir_context *ctx)
|
|
{
|
|
struct inode *inode = file_inode(file);
|
|
struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
|
|
struct btrfs_root *root = BTRFS_I(inode)->root;
|
|
struct btrfs_item *item;
|
|
struct btrfs_dir_item *di;
|
|
struct btrfs_key key;
|
|
struct btrfs_key found_key;
|
|
struct btrfs_path *path;
|
|
struct list_head ins_list;
|
|
struct list_head del_list;
|
|
int ret;
|
|
struct extent_buffer *leaf;
|
|
int slot;
|
|
unsigned char d_type;
|
|
int over = 0;
|
|
char tmp_name[32];
|
|
char *name_ptr;
|
|
int name_len;
|
|
bool put = false;
|
|
struct btrfs_key location;
|
|
|
|
if (!dir_emit_dots(file, ctx))
|
|
return 0;
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
|
|
path->reada = READA_FORWARD;
|
|
|
|
INIT_LIST_HEAD(&ins_list);
|
|
INIT_LIST_HEAD(&del_list);
|
|
put = btrfs_readdir_get_delayed_items(inode, &ins_list, &del_list);
|
|
|
|
key.type = BTRFS_DIR_INDEX_KEY;
|
|
key.offset = ctx->pos;
|
|
key.objectid = btrfs_ino(BTRFS_I(inode));
|
|
|
|
ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
|
|
if (ret < 0)
|
|
goto err;
|
|
|
|
while (1) {
|
|
leaf = path->nodes[0];
|
|
slot = path->slots[0];
|
|
if (slot >= btrfs_header_nritems(leaf)) {
|
|
ret = btrfs_next_leaf(root, path);
|
|
if (ret < 0)
|
|
goto err;
|
|
else if (ret > 0)
|
|
break;
|
|
continue;
|
|
}
|
|
|
|
item = btrfs_item_nr(slot);
|
|
btrfs_item_key_to_cpu(leaf, &found_key, slot);
|
|
|
|
if (found_key.objectid != key.objectid)
|
|
break;
|
|
if (found_key.type != BTRFS_DIR_INDEX_KEY)
|
|
break;
|
|
if (found_key.offset < ctx->pos)
|
|
goto next;
|
|
if (btrfs_should_delete_dir_index(&del_list, found_key.offset))
|
|
goto next;
|
|
|
|
ctx->pos = found_key.offset;
|
|
|
|
di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item);
|
|
if (verify_dir_item(fs_info, leaf, di))
|
|
goto next;
|
|
|
|
name_len = btrfs_dir_name_len(leaf, di);
|
|
if (name_len <= sizeof(tmp_name)) {
|
|
name_ptr = tmp_name;
|
|
} else {
|
|
name_ptr = kmalloc(name_len, GFP_KERNEL);
|
|
if (!name_ptr) {
|
|
ret = -ENOMEM;
|
|
goto err;
|
|
}
|
|
}
|
|
read_extent_buffer(leaf, name_ptr, (unsigned long)(di + 1),
|
|
name_len);
|
|
|
|
d_type = btrfs_filetype_table[btrfs_dir_type(leaf, di)];
|
|
btrfs_dir_item_key_to_cpu(leaf, di, &location);
|
|
|
|
over = !dir_emit(ctx, name_ptr, name_len, location.objectid,
|
|
d_type);
|
|
|
|
if (name_ptr != tmp_name)
|
|
kfree(name_ptr);
|
|
|
|
if (over)
|
|
goto nopos;
|
|
ctx->pos++;
|
|
next:
|
|
path->slots[0]++;
|
|
}
|
|
|
|
ret = btrfs_readdir_delayed_dir_index(ctx, &ins_list);
|
|
if (ret)
|
|
goto nopos;
|
|
|
|
/*
|
|
* Stop new entries from being returned after we return the last
|
|
* entry.
|
|
*
|
|
* New directory entries are assigned a strictly increasing
|
|
* offset. This means that new entries created during readdir
|
|
* are *guaranteed* to be seen in the future by that readdir.
|
|
* This has broken buggy programs which operate on names as
|
|
* they're returned by readdir. Until we re-use freed offsets
|
|
* we have this hack to stop new entries from being returned
|
|
* under the assumption that they'll never reach this huge
|
|
* offset.
|
|
*
|
|
* This is being careful not to overflow 32bit loff_t unless the
|
|
* last entry requires it because doing so has broken 32bit apps
|
|
* in the past.
|
|
*/
|
|
if (ctx->pos >= INT_MAX)
|
|
ctx->pos = LLONG_MAX;
|
|
else
|
|
ctx->pos = INT_MAX;
|
|
nopos:
|
|
ret = 0;
|
|
err:
|
|
if (put)
|
|
btrfs_readdir_put_delayed_items(inode, &ins_list, &del_list);
|
|
btrfs_free_path(path);
|
|
return ret;
|
|
}
|
|
|
|
int btrfs_write_inode(struct inode *inode, struct writeback_control *wbc)
|
|
{
|
|
struct btrfs_root *root = BTRFS_I(inode)->root;
|
|
struct btrfs_trans_handle *trans;
|
|
int ret = 0;
|
|
bool nolock = false;
|
|
|
|
if (test_bit(BTRFS_INODE_DUMMY, &BTRFS_I(inode)->runtime_flags))
|
|
return 0;
|
|
|
|
if (btrfs_fs_closing(root->fs_info) &&
|
|
btrfs_is_free_space_inode(BTRFS_I(inode)))
|
|
nolock = true;
|
|
|
|
if (wbc->sync_mode == WB_SYNC_ALL) {
|
|
if (nolock)
|
|
trans = btrfs_join_transaction_nolock(root);
|
|
else
|
|
trans = btrfs_join_transaction(root);
|
|
if (IS_ERR(trans))
|
|
return PTR_ERR(trans);
|
|
ret = btrfs_commit_transaction(trans);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* This is somewhat expensive, updating the tree every time the
|
|
* inode changes. But, it is most likely to find the inode in cache.
|
|
* FIXME, needs more benchmarking...there are no reasons other than performance
|
|
* to keep or drop this code.
|
|
*/
|
|
static int btrfs_dirty_inode(struct inode *inode)
|
|
{
|
|
struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
|
|
struct btrfs_root *root = BTRFS_I(inode)->root;
|
|
struct btrfs_trans_handle *trans;
|
|
int ret;
|
|
|
|
if (test_bit(BTRFS_INODE_DUMMY, &BTRFS_I(inode)->runtime_flags))
|
|
return 0;
|
|
|
|
trans = btrfs_join_transaction(root);
|
|
if (IS_ERR(trans))
|
|
return PTR_ERR(trans);
|
|
|
|
ret = btrfs_update_inode(trans, root, inode);
|
|
if (ret && ret == -ENOSPC) {
|
|
/* whoops, lets try again with the full transaction */
|
|
btrfs_end_transaction(trans);
|
|
trans = btrfs_start_transaction(root, 1);
|
|
if (IS_ERR(trans))
|
|
return PTR_ERR(trans);
|
|
|
|
ret = btrfs_update_inode(trans, root, inode);
|
|
}
|
|
btrfs_end_transaction(trans);
|
|
if (BTRFS_I(inode)->delayed_node)
|
|
btrfs_balance_delayed_items(fs_info);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* This is a copy of file_update_time. We need this so we can return error on
|
|
* ENOSPC for updating the inode in the case of file write and mmap writes.
|
|
*/
|
|
static int btrfs_update_time(struct inode *inode, struct timespec *now,
|
|
int flags)
|
|
{
|
|
struct btrfs_root *root = BTRFS_I(inode)->root;
|
|
|
|
if (btrfs_root_readonly(root))
|
|
return -EROFS;
|
|
|
|
if (flags & S_VERSION)
|
|
inode_inc_iversion(inode);
|
|
if (flags & S_CTIME)
|
|
inode->i_ctime = *now;
|
|
if (flags & S_MTIME)
|
|
inode->i_mtime = *now;
|
|
if (flags & S_ATIME)
|
|
inode->i_atime = *now;
|
|
return btrfs_dirty_inode(inode);
|
|
}
|
|
|
|
/*
|
|
* find the highest existing sequence number in a directory
|
|
* and then set the in-memory index_cnt variable to reflect
|
|
* free sequence numbers
|
|
*/
|
|
static int btrfs_set_inode_index_count(struct btrfs_inode *inode)
|
|
{
|
|
struct btrfs_root *root = inode->root;
|
|
struct btrfs_key key, found_key;
|
|
struct btrfs_path *path;
|
|
struct extent_buffer *leaf;
|
|
int ret;
|
|
|
|
key.objectid = btrfs_ino(inode);
|
|
key.type = BTRFS_DIR_INDEX_KEY;
|
|
key.offset = (u64)-1;
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
|
|
ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
|
|
if (ret < 0)
|
|
goto out;
|
|
/* FIXME: we should be able to handle this */
|
|
if (ret == 0)
|
|
goto out;
|
|
ret = 0;
|
|
|
|
/*
|
|
* MAGIC NUMBER EXPLANATION:
|
|
* since we search a directory based on f_pos we have to start at 2
|
|
* since '.' and '..' have f_pos of 0 and 1 respectively, so everybody
|
|
* else has to start at 2
|
|
*/
|
|
if (path->slots[0] == 0) {
|
|
inode->index_cnt = 2;
|
|
goto out;
|
|
}
|
|
|
|
path->slots[0]--;
|
|
|
|
leaf = path->nodes[0];
|
|
btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
|
|
|
|
if (found_key.objectid != btrfs_ino(inode) ||
|
|
found_key.type != BTRFS_DIR_INDEX_KEY) {
|
|
inode->index_cnt = 2;
|
|
goto out;
|
|
}
|
|
|
|
inode->index_cnt = found_key.offset + 1;
|
|
out:
|
|
btrfs_free_path(path);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* helper to find a free sequence number in a given directory. This current
|
|
* code is very simple, later versions will do smarter things in the btree
|
|
*/
|
|
int btrfs_set_inode_index(struct btrfs_inode *dir, u64 *index)
|
|
{
|
|
int ret = 0;
|
|
|
|
if (dir->index_cnt == (u64)-1) {
|
|
ret = btrfs_inode_delayed_dir_index_count(dir);
|
|
if (ret) {
|
|
ret = btrfs_set_inode_index_count(dir);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
*index = dir->index_cnt;
|
|
dir->index_cnt++;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int btrfs_insert_inode_locked(struct inode *inode)
|
|
{
|
|
struct btrfs_iget_args args;
|
|
args.location = &BTRFS_I(inode)->location;
|
|
args.root = BTRFS_I(inode)->root;
|
|
|
|
return insert_inode_locked4(inode,
|
|
btrfs_inode_hash(inode->i_ino, BTRFS_I(inode)->root),
|
|
btrfs_find_actor, &args);
|
|
}
|
|
|
|
static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root,
|
|
struct inode *dir,
|
|
const char *name, int name_len,
|
|
u64 ref_objectid, u64 objectid,
|
|
umode_t mode, u64 *index)
|
|
{
|
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
|
struct inode *inode;
|
|
struct btrfs_inode_item *inode_item;
|
|
struct btrfs_key *location;
|
|
struct btrfs_path *path;
|
|
struct btrfs_inode_ref *ref;
|
|
struct btrfs_key key[2];
|
|
u32 sizes[2];
|
|
int nitems = name ? 2 : 1;
|
|
unsigned long ptr;
|
|
int ret;
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
inode = new_inode(fs_info->sb);
|
|
if (!inode) {
|
|
btrfs_free_path(path);
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
|
|
/*
|
|
* O_TMPFILE, set link count to 0, so that after this point,
|
|
* we fill in an inode item with the correct link count.
|
|
*/
|
|
if (!name)
|
|
set_nlink(inode, 0);
|
|
|
|
/*
|
|
* we have to initialize this early, so we can reclaim the inode
|
|
* number if we fail afterwards in this function.
|
|
*/
|
|
inode->i_ino = objectid;
|
|
|
|
if (dir && name) {
|
|
trace_btrfs_inode_request(dir);
|
|
|
|
ret = btrfs_set_inode_index(BTRFS_I(dir), index);
|
|
if (ret) {
|
|
btrfs_free_path(path);
|
|
iput(inode);
|
|
return ERR_PTR(ret);
|
|
}
|
|
} else if (dir) {
|
|
*index = 0;
|
|
}
|
|
/*
|
|
* index_cnt is ignored for everything but a dir,
|
|
* btrfs_get_inode_index_count has an explanation for the magic
|
|
* number
|
|
*/
|
|
BTRFS_I(inode)->index_cnt = 2;
|
|
BTRFS_I(inode)->dir_index = *index;
|
|
BTRFS_I(inode)->root = root;
|
|
BTRFS_I(inode)->generation = trans->transid;
|
|
inode->i_generation = BTRFS_I(inode)->generation;
|
|
|
|
/*
|
|
* We could have gotten an inode number from somebody who was fsynced
|
|
* and then removed in this same transaction, so let's just set full
|
|
* sync since it will be a full sync anyway and this will blow away the
|
|
* old info in the log.
|
|
*/
|
|
set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, &BTRFS_I(inode)->runtime_flags);
|
|
|
|
key[0].objectid = objectid;
|
|
key[0].type = BTRFS_INODE_ITEM_KEY;
|
|
key[0].offset = 0;
|
|
|
|
sizes[0] = sizeof(struct btrfs_inode_item);
|
|
|
|
if (name) {
|
|
/*
|
|
* Start new inodes with an inode_ref. This is slightly more
|
|
* efficient for small numbers of hard links since they will
|
|
* be packed into one item. Extended refs will kick in if we
|
|
* add more hard links than can fit in the ref item.
|
|
*/
|
|
key[1].objectid = objectid;
|
|
key[1].type = BTRFS_INODE_REF_KEY;
|
|
key[1].offset = ref_objectid;
|
|
|
|
sizes[1] = name_len + sizeof(*ref);
|
|
}
|
|
|
|
location = &BTRFS_I(inode)->location;
|
|
location->objectid = objectid;
|
|
location->offset = 0;
|
|
location->type = BTRFS_INODE_ITEM_KEY;
|
|
|
|
ret = btrfs_insert_inode_locked(inode);
|
|
if (ret < 0)
|
|
goto fail;
|
|
|
|
path->leave_spinning = 1;
|
|
ret = btrfs_insert_empty_items(trans, root, path, key, sizes, nitems);
|
|
if (ret != 0)
|
|
goto fail_unlock;
|
|
|
|
inode_init_owner(inode, dir, mode);
|
|
inode_set_bytes(inode, 0);
|
|
|
|
inode->i_mtime = current_time(inode);
|
|
inode->i_atime = inode->i_mtime;
|
|
inode->i_ctime = inode->i_mtime;
|
|
BTRFS_I(inode)->i_otime = inode->i_mtime;
|
|
|
|
inode_item = btrfs_item_ptr(path->nodes[0], path->slots[0],
|
|
struct btrfs_inode_item);
|
|
memzero_extent_buffer(path->nodes[0], (unsigned long)inode_item,
|
|
sizeof(*inode_item));
|
|
fill_inode_item(trans, path->nodes[0], inode_item, inode);
|
|
|
|
if (name) {
|
|
ref = btrfs_item_ptr(path->nodes[0], path->slots[0] + 1,
|
|
struct btrfs_inode_ref);
|
|
btrfs_set_inode_ref_name_len(path->nodes[0], ref, name_len);
|
|
btrfs_set_inode_ref_index(path->nodes[0], ref, *index);
|
|
ptr = (unsigned long)(ref + 1);
|
|
write_extent_buffer(path->nodes[0], name, ptr, name_len);
|
|
}
|
|
|
|
btrfs_mark_buffer_dirty(path->nodes[0]);
|
|
btrfs_free_path(path);
|
|
|
|
btrfs_inherit_iflags(inode, dir);
|
|
|
|
if (S_ISREG(mode)) {
|
|
if (btrfs_test_opt(fs_info, NODATASUM))
|
|
BTRFS_I(inode)->flags |= BTRFS_INODE_NODATASUM;
|
|
if (btrfs_test_opt(fs_info, NODATACOW))
|
|
BTRFS_I(inode)->flags |= BTRFS_INODE_NODATACOW |
|
|
BTRFS_INODE_NODATASUM;
|
|
}
|
|
|
|
inode_tree_add(inode);
|
|
|
|
trace_btrfs_inode_new(inode);
|
|
btrfs_set_inode_last_trans(trans, inode);
|
|
|
|
btrfs_update_root_times(trans, root);
|
|
|
|
ret = btrfs_inode_inherit_props(trans, inode, dir);
|
|
if (ret)
|
|
btrfs_err(fs_info,
|
|
"error inheriting props for ino %llu (root %llu): %d",
|
|
btrfs_ino(BTRFS_I(inode)), root->root_key.objectid, ret);
|
|
|
|
return inode;
|
|
|
|
fail_unlock:
|
|
unlock_new_inode(inode);
|
|
fail:
|
|
if (dir && name)
|
|
BTRFS_I(dir)->index_cnt--;
|
|
btrfs_free_path(path);
|
|
iput(inode);
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
static inline u8 btrfs_inode_type(struct inode *inode)
|
|
{
|
|
return btrfs_type_by_mode[(inode->i_mode & S_IFMT) >> S_SHIFT];
|
|
}
|
|
|
|
/*
|
|
* utility function to add 'inode' into 'parent_inode' with
|
|
* a give name and a given sequence number.
|
|
* if 'add_backref' is true, also insert a backref from the
|
|
* inode to the parent directory.
|
|
*/
|
|
int btrfs_add_link(struct btrfs_trans_handle *trans,
|
|
struct inode *parent_inode, struct inode *inode,
|
|
const char *name, int name_len, int add_backref, u64 index)
|
|
{
|
|
struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
|
|
int ret = 0;
|
|
struct btrfs_key key;
|
|
struct btrfs_root *root = BTRFS_I(parent_inode)->root;
|
|
u64 ino = btrfs_ino(BTRFS_I(inode));
|
|
u64 parent_ino = btrfs_ino(BTRFS_I(parent_inode));
|
|
|
|
if (unlikely(ino == BTRFS_FIRST_FREE_OBJECTID)) {
|
|
memcpy(&key, &BTRFS_I(inode)->root->root_key, sizeof(key));
|
|
} else {
|
|
key.objectid = ino;
|
|
key.type = BTRFS_INODE_ITEM_KEY;
|
|
key.offset = 0;
|
|
}
|
|
|
|
if (unlikely(ino == BTRFS_FIRST_FREE_OBJECTID)) {
|
|
ret = btrfs_add_root_ref(trans, fs_info, key.objectid,
|
|
root->root_key.objectid, parent_ino,
|
|
index, name, name_len);
|
|
} else if (add_backref) {
|
|
ret = btrfs_insert_inode_ref(trans, root, name, name_len, ino,
|
|
parent_ino, index);
|
|
}
|
|
|
|
/* Nothing to clean up yet */
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = btrfs_insert_dir_item(trans, root, name, name_len,
|
|
BTRFS_I(parent_inode), &key,
|
|
btrfs_inode_type(inode), index);
|
|
if (ret == -EEXIST || ret == -EOVERFLOW)
|
|
goto fail_dir_item;
|
|
else if (ret) {
|
|
btrfs_abort_transaction(trans, ret);
|
|
return ret;
|
|
}
|
|
|
|
btrfs_i_size_write(BTRFS_I(parent_inode), parent_inode->i_size +
|
|
name_len * 2);
|
|
inode_inc_iversion(parent_inode);
|
|
parent_inode->i_mtime = parent_inode->i_ctime =
|
|
current_time(parent_inode);
|
|
ret = btrfs_update_inode(trans, root, parent_inode);
|
|
if (ret)
|
|
btrfs_abort_transaction(trans, ret);
|
|
return ret;
|
|
|
|
fail_dir_item:
|
|
if (unlikely(ino == BTRFS_FIRST_FREE_OBJECTID)) {
|
|
u64 local_index;
|
|
int err;
|
|
err = btrfs_del_root_ref(trans, fs_info, key.objectid,
|
|
root->root_key.objectid, parent_ino,
|
|
&local_index, name, name_len);
|
|
|
|
} else if (add_backref) {
|
|
u64 local_index;
|
|
int err;
|
|
|
|
err = btrfs_del_inode_ref(trans, root, name, name_len,
|
|
ino, parent_ino, &local_index);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int btrfs_add_nondir(struct btrfs_trans_handle *trans,
|
|
struct inode *dir, struct dentry *dentry,
|
|
struct inode *inode, int backref, u64 index)
|
|
{
|
|
int err = btrfs_add_link(trans, dir, inode,
|
|
dentry->d_name.name, dentry->d_name.len,
|
|
backref, index);
|
|
if (err > 0)
|
|
err = -EEXIST;
|
|
return err;
|
|
}
|
|
|
|
static int btrfs_mknod(struct inode *dir, struct dentry *dentry,
|
|
umode_t mode, dev_t rdev)
|
|
{
|
|
struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb);
|
|
struct btrfs_trans_handle *trans;
|
|
struct btrfs_root *root = BTRFS_I(dir)->root;
|
|
struct inode *inode = NULL;
|
|
int err;
|
|
int drop_inode = 0;
|
|
u64 objectid;
|
|
u64 index = 0;
|
|
|
|
/*
|
|
* 2 for inode item and ref
|
|
* 2 for dir items
|
|
* 1 for xattr if selinux is on
|
|
*/
|
|
trans = btrfs_start_transaction(root, 5);
|
|
if (IS_ERR(trans))
|
|
return PTR_ERR(trans);
|
|
|
|
err = btrfs_find_free_ino(root, &objectid);
|
|
if (err)
|
|
goto out_unlock;
|
|
|
|
inode = btrfs_new_inode(trans, root, dir, dentry->d_name.name,
|
|
dentry->d_name.len, btrfs_ino(BTRFS_I(dir)), objectid,
|
|
mode, &index);
|
|
if (IS_ERR(inode)) {
|
|
err = PTR_ERR(inode);
|
|
goto out_unlock;
|
|
}
|
|
|
|
/*
|
|
* If the active LSM wants to access the inode during
|
|
* d_instantiate it needs these. Smack checks to see
|
|
* if the filesystem supports xattrs by looking at the
|
|
* ops vector.
|
|
*/
|
|
inode->i_op = &btrfs_special_inode_operations;
|
|
init_special_inode(inode, inode->i_mode, rdev);
|
|
|
|
err = btrfs_init_inode_security(trans, inode, dir, &dentry->d_name);
|
|
if (err)
|
|
goto out_unlock_inode;
|
|
|
|
err = btrfs_add_nondir(trans, dir, dentry, inode, 0, index);
|
|
if (err) {
|
|
goto out_unlock_inode;
|
|
} else {
|
|
btrfs_update_inode(trans, root, inode);
|
|
unlock_new_inode(inode);
|
|
d_instantiate(dentry, inode);
|
|
}
|
|
|
|
out_unlock:
|
|
btrfs_end_transaction(trans);
|
|
btrfs_balance_delayed_items(fs_info);
|
|
btrfs_btree_balance_dirty(fs_info);
|
|
if (drop_inode) {
|
|
inode_dec_link_count(inode);
|
|
iput(inode);
|
|
}
|
|
return err;
|
|
|
|
out_unlock_inode:
|
|
drop_inode = 1;
|
|
unlock_new_inode(inode);
|
|
goto out_unlock;
|
|
|
|
}
|
|
|
|
static int btrfs_create(struct inode *dir, struct dentry *dentry,
|
|
umode_t mode, bool excl)
|
|
{
|
|
struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb);
|
|
struct btrfs_trans_handle *trans;
|
|
struct btrfs_root *root = BTRFS_I(dir)->root;
|
|
struct inode *inode = NULL;
|
|
int drop_inode_on_err = 0;
|
|
int err;
|
|
u64 objectid;
|
|
u64 index = 0;
|
|
|
|
/*
|
|
* 2 for inode item and ref
|
|
* 2 for dir items
|
|
* 1 for xattr if selinux is on
|
|
*/
|
|
trans = btrfs_start_transaction(root, 5);
|
|
if (IS_ERR(trans))
|
|
return PTR_ERR(trans);
|
|
|
|
err = btrfs_find_free_ino(root, &objectid);
|
|
if (err)
|
|
goto out_unlock;
|
|
|
|
inode = btrfs_new_inode(trans, root, dir, dentry->d_name.name,
|
|
dentry->d_name.len, btrfs_ino(BTRFS_I(dir)), objectid,
|
|
mode, &index);
|
|
if (IS_ERR(inode)) {
|
|
err = PTR_ERR(inode);
|
|
goto out_unlock;
|
|
}
|
|
drop_inode_on_err = 1;
|
|
/*
|
|
* If the active LSM wants to access the inode during
|
|
* d_instantiate it needs these. Smack checks to see
|
|
* if the filesystem supports xattrs by looking at the
|
|
* ops vector.
|
|
*/
|
|
inode->i_fop = &btrfs_file_operations;
|
|
inode->i_op = &btrfs_file_inode_operations;
|
|
inode->i_mapping->a_ops = &btrfs_aops;
|
|
|
|
err = btrfs_init_inode_security(trans, inode, dir, &dentry->d_name);
|
|
if (err)
|
|
goto out_unlock_inode;
|
|
|
|
err = btrfs_update_inode(trans, root, inode);
|
|
if (err)
|
|
goto out_unlock_inode;
|
|
|
|
err = btrfs_add_nondir(trans, dir, dentry, inode, 0, index);
|
|
if (err)
|
|
goto out_unlock_inode;
|
|
|
|
BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops;
|
|
unlock_new_inode(inode);
|
|
d_instantiate(dentry, inode);
|
|
|
|
out_unlock:
|
|
btrfs_end_transaction(trans);
|
|
if (err && drop_inode_on_err) {
|
|
inode_dec_link_count(inode);
|
|
iput(inode);
|
|
}
|
|
btrfs_balance_delayed_items(fs_info);
|
|
btrfs_btree_balance_dirty(fs_info);
|
|
return err;
|
|
|
|
out_unlock_inode:
|
|
unlock_new_inode(inode);
|
|
goto out_unlock;
|
|
|
|
}
|
|
|
|
static int btrfs_link(struct dentry *old_dentry, struct inode *dir,
|
|
struct dentry *dentry)
|
|
{
|
|
struct btrfs_trans_handle *trans = NULL;
|
|
struct btrfs_root *root = BTRFS_I(dir)->root;
|
|
struct inode *inode = d_inode(old_dentry);
|
|
struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
|
|
u64 index;
|
|
int err;
|
|
int drop_inode = 0;
|
|
|
|
/* do not allow sys_link's with other subvols of the same device */
|
|
if (root->objectid != BTRFS_I(inode)->root->objectid)
|
|
return -EXDEV;
|
|
|
|
if (inode->i_nlink >= BTRFS_LINK_MAX)
|
|
return -EMLINK;
|
|
|
|
err = btrfs_set_inode_index(BTRFS_I(dir), &index);
|
|
if (err)
|
|
goto fail;
|
|
|
|
/*
|
|
* 2 items for inode and inode ref
|
|
* 2 items for dir items
|
|
* 1 item for parent inode
|
|
*/
|
|
trans = btrfs_start_transaction(root, 5);
|
|
if (IS_ERR(trans)) {
|
|
err = PTR_ERR(trans);
|
|
trans = NULL;
|
|
goto fail;
|
|
}
|
|
|
|
/* There are several dir indexes for this inode, clear the cache. */
|
|
BTRFS_I(inode)->dir_index = 0ULL;
|
|
inc_nlink(inode);
|
|
inode_inc_iversion(inode);
|
|
inode->i_ctime = current_time(inode);
|
|
ihold(inode);
|
|
set_bit(BTRFS_INODE_COPY_EVERYTHING, &BTRFS_I(inode)->runtime_flags);
|
|
|
|
err = btrfs_add_nondir(trans, dir, dentry, inode, 1, index);
|
|
|
|
if (err) {
|
|
drop_inode = 1;
|
|
} else {
|
|
struct dentry *parent = dentry->d_parent;
|
|
err = btrfs_update_inode(trans, root, inode);
|
|
if (err)
|
|
goto fail;
|
|
if (inode->i_nlink == 1) {
|
|
/*
|
|
* If new hard link count is 1, it's a file created
|
|
* with open(2) O_TMPFILE flag.
|
|
*/
|
|
err = btrfs_orphan_del(trans, inode);
|
|
if (err)
|
|
goto fail;
|
|
}
|
|
d_instantiate(dentry, inode);
|
|
btrfs_log_new_name(trans, BTRFS_I(inode), NULL, parent);
|
|
}
|
|
|
|
btrfs_balance_delayed_items(fs_info);
|
|
fail:
|
|
if (trans)
|
|
btrfs_end_transaction(trans);
|
|
if (drop_inode) {
|
|
inode_dec_link_count(inode);
|
|
iput(inode);
|
|
}
|
|
btrfs_btree_balance_dirty(fs_info);
|
|
return err;
|
|
}
|
|
|
|
static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
|
|
{
|
|
struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb);
|
|
struct inode *inode = NULL;
|
|
struct btrfs_trans_handle *trans;
|
|
struct btrfs_root *root = BTRFS_I(dir)->root;
|
|
int err = 0;
|
|
int drop_on_err = 0;
|
|
u64 objectid = 0;
|
|
u64 index = 0;
|
|
|
|
/*
|
|
* 2 items for inode and ref
|
|
* 2 items for dir items
|
|
* 1 for xattr if selinux is on
|
|
*/
|
|
trans = btrfs_start_transaction(root, 5);
|
|
if (IS_ERR(trans))
|
|
return PTR_ERR(trans);
|
|
|
|
err = btrfs_find_free_ino(root, &objectid);
|
|
if (err)
|
|
goto out_fail;
|
|
|
|
inode = btrfs_new_inode(trans, root, dir, dentry->d_name.name,
|
|
dentry->d_name.len, btrfs_ino(BTRFS_I(dir)), objectid,
|
|
S_IFDIR | mode, &index);
|
|
if (IS_ERR(inode)) {
|
|
err = PTR_ERR(inode);
|
|
goto out_fail;
|
|
}
|
|
|
|
drop_on_err = 1;
|
|
/* these must be set before we unlock the inode */
|
|
inode->i_op = &btrfs_dir_inode_operations;
|
|
inode->i_fop = &btrfs_dir_file_operations;
|
|
|
|
err = btrfs_init_inode_security(trans, inode, dir, &dentry->d_name);
|
|
if (err)
|
|
goto out_fail_inode;
|
|
|
|
btrfs_i_size_write(BTRFS_I(inode), 0);
|
|
err = btrfs_update_inode(trans, root, inode);
|
|
if (err)
|
|
goto out_fail_inode;
|
|
|
|
err = btrfs_add_link(trans, dir, inode, dentry->d_name.name,
|
|
dentry->d_name.len, 0, index);
|
|
if (err)
|
|
goto out_fail_inode;
|
|
|
|
d_instantiate(dentry, inode);
|
|
/*
|
|
* mkdir is special. We're unlocking after we call d_instantiate
|
|
* to avoid a race with nfsd calling d_instantiate.
|
|
*/
|
|
unlock_new_inode(inode);
|
|
drop_on_err = 0;
|
|
|
|
out_fail:
|
|
btrfs_end_transaction(trans);
|
|
if (drop_on_err) {
|
|
inode_dec_link_count(inode);
|
|
iput(inode);
|
|
}
|
|
btrfs_balance_delayed_items(fs_info);
|
|
btrfs_btree_balance_dirty(fs_info);
|
|
return err;
|
|
|
|
out_fail_inode:
|
|
unlock_new_inode(inode);
|
|
goto out_fail;
|
|
}
|
|
|
|
/* Find next extent map of a given extent map, caller needs to ensure locks */
|
|
static struct extent_map *next_extent_map(struct extent_map *em)
|
|
{
|
|
struct rb_node *next;
|
|
|
|
next = rb_next(&em->rb_node);
|
|
if (!next)
|
|
return NULL;
|
|
return container_of(next, struct extent_map, rb_node);
|
|
}
|
|
|
|
static struct extent_map *prev_extent_map(struct extent_map *em)
|
|
{
|
|
struct rb_node *prev;
|
|
|
|
prev = rb_prev(&em->rb_node);
|
|
if (!prev)
|
|
return NULL;
|
|
return container_of(prev, struct extent_map, rb_node);
|
|
}
|
|
|
|
/* helper for btfs_get_extent. Given an existing extent in the tree,
|
|
* the existing extent is the nearest extent to map_start,
|
|
* and an extent that you want to insert, deal with overlap and insert
|
|
* the best fitted new extent into the tree.
|
|
*/
|
|
static int merge_extent_mapping(struct extent_map_tree *em_tree,
|
|
struct extent_map *existing,
|
|
struct extent_map *em,
|
|
u64 map_start)
|
|
{
|
|
struct extent_map *prev;
|
|
struct extent_map *next;
|
|
u64 start;
|
|
u64 end;
|
|
u64 start_diff;
|
|
|
|
BUG_ON(map_start < em->start || map_start >= extent_map_end(em));
|
|
|
|
if (existing->start > map_start) {
|
|
next = existing;
|
|
prev = prev_extent_map(next);
|
|
} else {
|
|
prev = existing;
|
|
next = next_extent_map(prev);
|
|
}
|
|
|
|
start = prev ? extent_map_end(prev) : em->start;
|
|
start = max_t(u64, start, em->start);
|
|
end = next ? next->start : extent_map_end(em);
|
|
end = min_t(u64, end, extent_map_end(em));
|
|
start_diff = start - em->start;
|
|
em->start = start;
|
|
em->len = end - start;
|
|
if (em->block_start < EXTENT_MAP_LAST_BYTE &&
|
|
!test_bit(EXTENT_FLAG_COMPRESSED, &em->flags)) {
|
|
em->block_start += start_diff;
|
|
em->block_len -= start_diff;
|
|
}
|
|
return add_extent_mapping(em_tree, em, 0);
|
|
}
|
|
|
|
static noinline int uncompress_inline(struct btrfs_path *path,
|
|
struct page *page,
|
|
size_t pg_offset, u64 extent_offset,
|
|
struct btrfs_file_extent_item *item)
|
|
{
|
|
int ret;
|
|
struct extent_buffer *leaf = path->nodes[0];
|
|
char *tmp;
|
|
size_t max_size;
|
|
unsigned long inline_size;
|
|
unsigned long ptr;
|
|
int compress_type;
|
|
|
|
WARN_ON(pg_offset != 0);
|
|
compress_type = btrfs_file_extent_compression(leaf, item);
|
|
max_size = btrfs_file_extent_ram_bytes(leaf, item);
|
|
inline_size = btrfs_file_extent_inline_item_len(leaf,
|
|
btrfs_item_nr(path->slots[0]));
|
|
tmp = kmalloc(inline_size, GFP_NOFS);
|
|
if (!tmp)
|
|
return -ENOMEM;
|
|
ptr = btrfs_file_extent_inline_start(item);
|
|
|
|
read_extent_buffer(leaf, tmp, ptr, inline_size);
|
|
|
|
max_size = min_t(unsigned long, PAGE_SIZE, max_size);
|
|
ret = btrfs_decompress(compress_type, tmp, page,
|
|
extent_offset, inline_size, max_size);
|
|
kfree(tmp);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* a bit scary, this does extent mapping from logical file offset to the disk.
|
|
* the ugly parts come from merging extents from the disk with the in-ram
|
|
* representation. This gets more complex because of the data=ordered code,
|
|
* where the in-ram extents might be locked pending data=ordered completion.
|
|
*
|
|
* This also copies inline extents directly into the page.
|
|
*/
|
|
|
|
struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
|
|
size_t pg_offset, u64 start, u64 len,
|
|
int create)
|
|
{
|
|
struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
|
|
int ret;
|
|
int err = 0;
|
|
u64 extent_start = 0;
|
|
u64 extent_end = 0;
|
|
u64 objectid = btrfs_ino(BTRFS_I(inode));
|
|
u32 found_type;
|
|
struct btrfs_path *path = NULL;
|
|
struct btrfs_root *root = BTRFS_I(inode)->root;
|
|
struct btrfs_file_extent_item *item;
|
|
struct extent_buffer *leaf;
|
|
struct btrfs_key found_key;
|
|
struct extent_map *em = NULL;
|
|
struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
|
|
struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
|
|
struct btrfs_trans_handle *trans = NULL;
|
|
const bool new_inline = !page || create;
|
|
|
|
again:
|
|
read_lock(&em_tree->lock);
|
|
em = lookup_extent_mapping(em_tree, start, len);
|
|
if (em)
|
|
em->bdev = fs_info->fs_devices->latest_bdev;
|
|
read_unlock(&em_tree->lock);
|
|
|
|
if (em) {
|
|
if (em->start > start || em->start + em->len <= start)
|
|
free_extent_map(em);
|
|
else if (em->block_start == EXTENT_MAP_INLINE && page)
|
|
free_extent_map(em);
|
|
else
|
|
goto out;
|
|
}
|
|
em = alloc_extent_map();
|
|
if (!em) {
|
|
err = -ENOMEM;
|
|
goto out;
|
|
}
|
|
em->bdev = fs_info->fs_devices->latest_bdev;
|
|
em->start = EXTENT_MAP_HOLE;
|
|
em->orig_start = EXTENT_MAP_HOLE;
|
|
em->len = (u64)-1;
|
|
em->block_len = (u64)-1;
|
|
|
|
if (!path) {
|
|
path = btrfs_alloc_path();
|
|
if (!path) {
|
|
err = -ENOMEM;
|
|
goto out;
|
|
}
|
|
/*
|
|
* Chances are we'll be called again, so go ahead and do
|
|
* readahead
|
|
*/
|
|
path->reada = READA_FORWARD;
|
|
}
|
|
|
|
ret = btrfs_lookup_file_extent(trans, root, path,
|
|
objectid, start, trans != NULL);
|
|
if (ret < 0) {
|
|
err = ret;
|
|
goto out;
|
|
}
|
|
|
|
if (ret != 0) {
|
|
if (path->slots[0] == 0)
|
|
goto not_found;
|
|
path->slots[0]--;
|
|
}
|
|
|
|
leaf = path->nodes[0];
|
|
item = btrfs_item_ptr(leaf, path->slots[0],
|
|
struct btrfs_file_extent_item);
|
|
/* are we inside the extent that was found? */
|
|
btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
|
|
found_type = found_key.type;
|
|
if (found_key.objectid != objectid ||
|
|
found_type != BTRFS_EXTENT_DATA_KEY) {
|
|
/*
|
|
* If we backup past the first extent we want to move forward
|
|
* and see if there is an extent in front of us, otherwise we'll
|
|
* say there is a hole for our whole search range which can
|
|
* cause problems.
|
|
*/
|
|
extent_end = start;
|
|
goto next;
|
|
}
|
|
|
|
found_type = btrfs_file_extent_type(leaf, item);
|
|
extent_start = found_key.offset;
|
|
if (found_type == BTRFS_FILE_EXTENT_REG ||
|
|
found_type == BTRFS_FILE_EXTENT_PREALLOC) {
|
|
extent_end = extent_start +
|
|
btrfs_file_extent_num_bytes(leaf, item);
|
|
} else if (found_type == BTRFS_FILE_EXTENT_INLINE) {
|
|
size_t size;
|
|
size = btrfs_file_extent_inline_len(leaf, path->slots[0], item);
|
|
extent_end = ALIGN(extent_start + size,
|
|
fs_info->sectorsize);
|
|
}
|
|
next:
|
|
if (start >= extent_end) {
|
|
path->slots[0]++;
|
|
if (path->slots[0] >= btrfs_header_nritems(leaf)) {
|
|
ret = btrfs_next_leaf(root, path);
|
|
if (ret < 0) {
|
|
err = ret;
|
|
goto out;
|
|
}
|
|
if (ret > 0)
|
|
goto not_found;
|
|
leaf = path->nodes[0];
|
|
}
|
|
btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
|
|
if (found_key.objectid != objectid ||
|
|
found_key.type != BTRFS_EXTENT_DATA_KEY)
|
|
goto not_found;
|
|
if (start + len <= found_key.offset)
|
|
goto not_found;
|
|
if (start > found_key.offset)
|
|
goto next;
|
|
em->start = start;
|
|
em->orig_start = start;
|
|
em->len = found_key.offset - start;
|
|
goto not_found_em;
|
|
}
|
|
|
|
btrfs_extent_item_to_extent_map(inode, path, item, new_inline, em);
|
|
|
|
if (found_type == BTRFS_FILE_EXTENT_REG ||
|
|
found_type == BTRFS_FILE_EXTENT_PREALLOC) {
|
|
goto insert;
|
|
} else if (found_type == BTRFS_FILE_EXTENT_INLINE) {
|
|
unsigned long ptr;
|
|
char *map;
|
|
size_t size;
|
|
size_t extent_offset;
|
|
size_t copy_size;
|
|
|
|
if (new_inline)
|
|
goto out;
|
|
|
|
size = btrfs_file_extent_inline_len(leaf, path->slots[0], item);
|
|
extent_offset = page_offset(page) + pg_offset - extent_start;
|
|
copy_size = min_t(u64, PAGE_SIZE - pg_offset,
|
|
size - extent_offset);
|
|
em->start = extent_start + extent_offset;
|
|
em->len = ALIGN(copy_size, fs_info->sectorsize);
|
|
em->orig_block_len = em->len;
|
|
em->orig_start = em->start;
|
|
ptr = btrfs_file_extent_inline_start(item) + extent_offset;
|
|
if (create == 0 && !PageUptodate(page)) {
|
|
if (btrfs_file_extent_compression(leaf, item) !=
|
|
BTRFS_COMPRESS_NONE) {
|
|
ret = uncompress_inline(path, page, pg_offset,
|
|
extent_offset, item);
|
|
if (ret) {
|
|
err = ret;
|
|
goto out;
|
|
}
|
|
} else {
|
|
map = kmap(page);
|
|
read_extent_buffer(leaf, map + pg_offset, ptr,
|
|
copy_size);
|
|
if (pg_offset + copy_size < PAGE_SIZE) {
|
|
memset(map + pg_offset + copy_size, 0,
|
|
PAGE_SIZE - pg_offset -
|
|
copy_size);
|
|
}
|
|
kunmap(page);
|
|
}
|
|
flush_dcache_page(page);
|
|
} else if (create && PageUptodate(page)) {
|
|
BUG();
|
|
if (!trans) {
|
|
kunmap(page);
|
|
free_extent_map(em);
|
|
em = NULL;
|
|
|
|
btrfs_release_path(path);
|
|
trans = btrfs_join_transaction(root);
|
|
|
|
if (IS_ERR(trans))
|
|
return ERR_CAST(trans);
|
|
goto again;
|
|
}
|
|
map = kmap(page);
|
|
write_extent_buffer(leaf, map + pg_offset, ptr,
|
|
copy_size);
|
|
kunmap(page);
|
|
btrfs_mark_buffer_dirty(leaf);
|
|
}
|
|
set_extent_uptodate(io_tree, em->start,
|
|
extent_map_end(em) - 1, NULL, GFP_NOFS);
|
|
goto insert;
|
|
}
|
|
not_found:
|
|
em->start = start;
|
|
em->orig_start = start;
|
|
em->len = len;
|
|
not_found_em:
|
|
em->block_start = EXTENT_MAP_HOLE;
|
|
set_bit(EXTENT_FLAG_VACANCY, &em->flags);
|
|
insert:
|
|
btrfs_release_path(path);
|
|
if (em->start > start || extent_map_end(em) <= start) {
|
|
btrfs_err(fs_info,
|
|
"bad extent! em: [%llu %llu] passed [%llu %llu]",
|
|
em->start, em->len, start, len);
|
|
err = -EIO;
|
|
goto out;
|
|
}
|
|
|
|
err = 0;
|
|
write_lock(&em_tree->lock);
|
|
ret = add_extent_mapping(em_tree, em, 0);
|
|
/* it is possible that someone inserted the extent into the tree
|
|
* while we had the lock dropped. It is also possible that
|
|
* an overlapping map exists in the tree
|
|
*/
|
|
if (ret == -EEXIST) {
|
|
struct extent_map *existing;
|
|
|
|
ret = 0;
|
|
|
|
existing = search_extent_mapping(em_tree, start, len);
|
|
/*
|
|
* existing will always be non-NULL, since there must be
|
|
* extent causing the -EEXIST.
|
|
*/
|
|
if (existing->start == em->start &&
|
|
extent_map_end(existing) >= extent_map_end(em) &&
|
|
em->block_start == existing->block_start) {
|
|
/*
|
|
* The existing extent map already encompasses the
|
|
* entire extent map we tried to add.
|
|
*/
|
|
free_extent_map(em);
|
|
em = existing;
|
|
err = 0;
|
|
|
|
} else if (start >= extent_map_end(existing) ||
|
|
start <= existing->start) {
|
|
/*
|
|
* The existing extent map is the one nearest to
|
|
* the [start, start + len) range which overlaps
|
|
*/
|
|
err = merge_extent_mapping(em_tree, existing,
|
|
em, start);
|
|
free_extent_map(existing);
|
|
if (err) {
|
|
free_extent_map(em);
|
|
em = NULL;
|
|
}
|
|
} else {
|
|
free_extent_map(em);
|
|
em = existing;
|
|
err = 0;
|
|
}
|
|
}
|
|
write_unlock(&em_tree->lock);
|
|
out:
|
|
|
|
trace_btrfs_get_extent(root, BTRFS_I(inode), em);
|
|
|
|
btrfs_free_path(path);
|
|
if (trans) {
|
|
ret = btrfs_end_transaction(trans);
|
|
if (!err)
|
|
err = ret;
|
|
}
|
|
if (err) {
|
|
free_extent_map(em);
|
|
return ERR_PTR(err);
|
|
}
|
|
BUG_ON(!em); /* Error is always set */
|
|
return em;
|
|
}
|
|
|
|
struct extent_map *btrfs_get_extent_fiemap(struct inode *inode, struct page *page,
|
|
size_t pg_offset, u64 start, u64 len,
|
|
int create)
|
|
{
|
|
struct extent_map *em;
|
|
struct extent_map *hole_em = NULL;
|
|
u64 range_start = start;
|
|
u64 end;
|
|
u64 found;
|
|
u64 found_end;
|
|
int err = 0;
|
|
|
|
em = btrfs_get_extent(inode, page, pg_offset, start, len, create);
|
|
if (IS_ERR(em))
|
|
return em;
|
|
if (em) {
|
|
/*
|
|
* if our em maps to
|
|
* - a hole or
|
|
* - a pre-alloc extent,
|
|
* there might actually be delalloc bytes behind it.
|
|
*/
|
|
if (em->block_start != EXTENT_MAP_HOLE &&
|
|
!test_bit(EXTENT_FLAG_PREALLOC, &em->flags))
|
|
return em;
|
|
else
|
|
hole_em = em;
|
|
}
|
|
|
|
/* check to see if we've wrapped (len == -1 or similar) */
|
|
end = start + len;
|
|
if (end < start)
|
|
end = (u64)-1;
|
|
else
|
|
end -= 1;
|
|
|
|
em = NULL;
|
|
|
|
/* ok, we didn't find anything, lets look for delalloc */
|
|
found = count_range_bits(&BTRFS_I(inode)->io_tree, &range_start,
|
|
end, len, EXTENT_DELALLOC, 1);
|
|
found_end = range_start + found;
|
|
if (found_end < range_start)
|
|
found_end = (u64)-1;
|
|
|
|
/*
|
|
* we didn't find anything useful, return
|
|
* the original results from get_extent()
|
|
*/
|
|
if (range_start > end || found_end <= start) {
|
|
em = hole_em;
|
|
hole_em = NULL;
|
|
goto out;
|
|
}
|
|
|
|
/* adjust the range_start to make sure it doesn't
|
|
* go backwards from the start they passed in
|
|
*/
|
|
range_start = max(start, range_start);
|
|
found = found_end - range_start;
|
|
|
|
if (found > 0) {
|
|
u64 hole_start = start;
|
|
u64 hole_len = len;
|
|
|
|
em = alloc_extent_map();
|
|
if (!em) {
|
|
err = -ENOMEM;
|
|
goto out;
|
|
}
|
|
/*
|
|
* when btrfs_get_extent can't find anything it
|
|
* returns one huge hole
|
|
*
|
|
* make sure what it found really fits our range, and
|
|
* adjust to make sure it is based on the start from
|
|
* the caller
|
|
*/
|
|
if (hole_em) {
|
|
u64 calc_end = extent_map_end(hole_em);
|
|
|
|
if (calc_end <= start || (hole_em->start > end)) {
|
|
free_extent_map(hole_em);
|
|
hole_em = NULL;
|
|
} else {
|
|
hole_start = max(hole_em->start, start);
|
|
hole_len = calc_end - hole_start;
|
|
}
|
|
}
|
|
em->bdev = NULL;
|
|
if (hole_em && range_start > hole_start) {
|
|
/* our hole starts before our delalloc, so we
|
|
* have to return just the parts of the hole
|
|
* that go until the delalloc starts
|
|
*/
|
|
em->len = min(hole_len,
|
|
range_start - hole_start);
|
|
em->start = hole_start;
|
|
em->orig_start = hole_start;
|
|
/*
|
|
* don't adjust block start at all,
|
|
* it is fixed at EXTENT_MAP_HOLE
|
|
*/
|
|
em->block_start = hole_em->block_start;
|
|
em->block_len = hole_len;
|
|
if (test_bit(EXTENT_FLAG_PREALLOC, &hole_em->flags))
|
|
set_bit(EXTENT_FLAG_PREALLOC, &em->flags);
|
|
} else {
|
|
em->start = range_start;
|
|
em->len = found;
|
|
em->orig_start = range_start;
|
|
em->block_start = EXTENT_MAP_DELALLOC;
|
|
em->block_len = found;
|
|
}
|
|
} else if (hole_em) {
|
|
return hole_em;
|
|
}
|
|
out:
|
|
|
|
free_extent_map(hole_em);
|
|
if (err) {
|
|
free_extent_map(em);
|
|
return ERR_PTR(err);
|
|
}
|
|
return em;
|
|
}
|
|
|
|
static struct extent_map *btrfs_create_dio_extent(struct inode *inode,
|
|
const u64 start,
|
|
const u64 len,
|
|
const u64 orig_start,
|
|
const u64 block_start,
|
|
const u64 block_len,
|
|
const u64 orig_block_len,
|
|
const u64 ram_bytes,
|
|
const int type)
|
|
{
|
|
struct extent_map *em = NULL;
|
|
int ret;
|
|
|
|
if (type != BTRFS_ORDERED_NOCOW) {
|
|
em = create_io_em(inode, start, len, orig_start,
|
|
block_start, block_len, orig_block_len,
|
|
ram_bytes,
|
|
BTRFS_COMPRESS_NONE, /* compress_type */
|
|
type);
|
|
if (IS_ERR(em))
|
|
goto out;
|
|
}
|
|
ret = btrfs_add_ordered_extent_dio(inode, start, block_start,
|
|
len, block_len, type);
|
|
if (ret) {
|
|
if (em) {
|
|
free_extent_map(em);
|
|
btrfs_drop_extent_cache(BTRFS_I(inode), start,
|
|
start + len - 1, 0);
|
|
}
|
|
em = ERR_PTR(ret);
|
|
}
|
|
out:
|
|
|
|
return em;
|
|
}
|
|
|
|
static struct extent_map *btrfs_new_extent_direct(struct inode *inode,
|
|
u64 start, u64 len)
|
|
{
|
|
struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
|
|
struct btrfs_root *root = BTRFS_I(inode)->root;
|
|
struct extent_map *em;
|
|
struct btrfs_key ins;
|
|
u64 alloc_hint;
|
|
int ret;
|
|
|
|
alloc_hint = get_extent_allocation_hint(inode, start, len);
|
|
ret = btrfs_reserve_extent(root, len, len, fs_info->sectorsize,
|
|
0, alloc_hint, &ins, 1, 1);
|
|
if (ret)
|
|
return ERR_PTR(ret);
|
|
|
|
em = btrfs_create_dio_extent(inode, start, ins.offset, start,
|
|
ins.objectid, ins.offset, ins.offset,
|
|
ins.offset, BTRFS_ORDERED_REGULAR);
|
|
btrfs_dec_block_group_reservations(fs_info, ins.objectid);
|
|
if (IS_ERR(em))
|
|
btrfs_free_reserved_extent(fs_info, ins.objectid,
|
|
ins.offset, 1);
|
|
|
|
return em;
|
|
}
|
|
|
|
/*
|
|
* returns 1 when the nocow is safe, < 1 on error, 0 if the
|
|
* block must be cow'd
|
|
*/
|
|
noinline int can_nocow_extent(struct inode *inode, u64 offset, u64 *len,
|
|
u64 *orig_start, u64 *orig_block_len,
|
|
u64 *ram_bytes)
|
|
{
|
|
struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
|
|
struct btrfs_path *path;
|
|
int ret;
|
|
struct extent_buffer *leaf;
|
|
struct btrfs_root *root = BTRFS_I(inode)->root;
|
|
struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
|
|
struct btrfs_file_extent_item *fi;
|
|
struct btrfs_key key;
|
|
u64 disk_bytenr;
|
|
u64 backref_offset;
|
|
u64 extent_end;
|
|
u64 num_bytes;
|
|
int slot;
|
|
int found_type;
|
|
bool nocow = (BTRFS_I(inode)->flags & BTRFS_INODE_NODATACOW);
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
|
|
ret = btrfs_lookup_file_extent(NULL, root, path,
|
|
btrfs_ino(BTRFS_I(inode)), offset, 0);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
slot = path->slots[0];
|
|
if (ret == 1) {
|
|
if (slot == 0) {
|
|
/* can't find the item, must cow */
|
|
ret = 0;
|
|
goto out;
|
|
}
|
|
slot--;
|
|
}
|
|
ret = 0;
|
|
leaf = path->nodes[0];
|
|
btrfs_item_key_to_cpu(leaf, &key, slot);
|
|
if (key.objectid != btrfs_ino(BTRFS_I(inode)) ||
|
|
key.type != BTRFS_EXTENT_DATA_KEY) {
|
|
/* not our file or wrong item type, must cow */
|
|
goto out;
|
|
}
|
|
|
|
if (key.offset > offset) {
|
|
/* Wrong offset, must cow */
|
|
goto out;
|
|
}
|
|
|
|
fi = btrfs_item_ptr(leaf, slot, struct btrfs_file_extent_item);
|
|
found_type = btrfs_file_extent_type(leaf, fi);
|
|
if (found_type != BTRFS_FILE_EXTENT_REG &&
|
|
found_type != BTRFS_FILE_EXTENT_PREALLOC) {
|
|
/* not a regular extent, must cow */
|
|
goto out;
|
|
}
|
|
|
|
if (!nocow && found_type == BTRFS_FILE_EXTENT_REG)
|
|
goto out;
|
|
|
|
extent_end = key.offset + btrfs_file_extent_num_bytes(leaf, fi);
|
|
if (extent_end <= offset)
|
|
goto out;
|
|
|
|
disk_bytenr = btrfs_file_extent_disk_bytenr(leaf, fi);
|
|
if (disk_bytenr == 0)
|
|
goto out;
|
|
|
|
if (btrfs_file_extent_compression(leaf, fi) ||
|
|
btrfs_file_extent_encryption(leaf, fi) ||
|
|
btrfs_file_extent_other_encoding(leaf, fi))
|
|
goto out;
|
|
|
|
backref_offset = btrfs_file_extent_offset(leaf, fi);
|
|
|
|
if (orig_start) {
|
|
*orig_start = key.offset - backref_offset;
|
|
*orig_block_len = btrfs_file_extent_disk_num_bytes(leaf, fi);
|
|
*ram_bytes = btrfs_file_extent_ram_bytes(leaf, fi);
|
|
}
|
|
|
|
if (btrfs_extent_readonly(fs_info, disk_bytenr))
|
|
goto out;
|
|
|
|
num_bytes = min(offset + *len, extent_end) - offset;
|
|
if (!nocow && found_type == BTRFS_FILE_EXTENT_PREALLOC) {
|
|
u64 range_end;
|
|
|
|
range_end = round_up(offset + num_bytes,
|
|
root->fs_info->sectorsize) - 1;
|
|
ret = test_range_bit(io_tree, offset, range_end,
|
|
EXTENT_DELALLOC, 0, NULL);
|
|
if (ret) {
|
|
ret = -EAGAIN;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
btrfs_release_path(path);
|
|
|
|
/*
|
|
* look for other files referencing this extent, if we
|
|
* find any we must cow
|
|
*/
|
|
|
|
ret = btrfs_cross_ref_exist(root, btrfs_ino(BTRFS_I(inode)),
|
|
key.offset - backref_offset, disk_bytenr);
|
|
if (ret) {
|
|
ret = 0;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* adjust disk_bytenr and num_bytes to cover just the bytes
|
|
* in this extent we are about to write. If there
|
|
* are any csums in that range we have to cow in order
|
|
* to keep the csums correct
|
|
*/
|
|
disk_bytenr += backref_offset;
|
|
disk_bytenr += offset - key.offset;
|
|
if (csum_exist_in_range(fs_info, disk_bytenr, num_bytes))
|
|
goto out;
|
|
/*
|
|
* all of the above have passed, it is safe to overwrite this extent
|
|
* without cow
|
|
*/
|
|
*len = num_bytes;
|
|
ret = 1;
|
|
out:
|
|
btrfs_free_path(path);
|
|
return ret;
|
|
}
|
|
|
|
bool btrfs_page_exists_in_range(struct inode *inode, loff_t start, loff_t end)
|
|
{
|
|
struct radix_tree_root *root = &inode->i_mapping->page_tree;
|
|
int found = false;
|
|
void **pagep = NULL;
|
|
struct page *page = NULL;
|
|
int start_idx;
|
|
int end_idx;
|
|
|
|
start_idx = start >> PAGE_SHIFT;
|
|
|
|
/*
|
|
* end is the last byte in the last page. end == start is legal
|
|
*/
|
|
end_idx = end >> PAGE_SHIFT;
|
|
|
|
rcu_read_lock();
|
|
|
|
/* Most of the code in this while loop is lifted from
|
|
* find_get_page. It's been modified to begin searching from a
|
|
* page and return just the first page found in that range. If the
|
|
* found idx is less than or equal to the end idx then we know that
|
|
* a page exists. If no pages are found or if those pages are
|
|
* outside of the range then we're fine (yay!) */
|
|
while (page == NULL &&
|
|
radix_tree_gang_lookup_slot(root, &pagep, NULL, start_idx, 1)) {
|
|
page = radix_tree_deref_slot(pagep);
|
|
if (unlikely(!page))
|
|
break;
|
|
|
|
if (radix_tree_exception(page)) {
|
|
if (radix_tree_deref_retry(page)) {
|
|
page = NULL;
|
|
continue;
|
|
}
|
|
/*
|
|
* Otherwise, shmem/tmpfs must be storing a swap entry
|
|
* here as an exceptional entry: so return it without
|
|
* attempting to raise page count.
|
|
*/
|
|
page = NULL;
|
|
break; /* TODO: Is this relevant for this use case? */
|
|
}
|
|
|
|
if (!page_cache_get_speculative(page)) {
|
|
page = NULL;
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* Has the page moved?
|
|
* This is part of the lockless pagecache protocol. See
|
|
* include/linux/pagemap.h for details.
|
|
*/
|
|
if (unlikely(page != *pagep)) {
|
|
put_page(page);
|
|
page = NULL;
|
|
}
|
|
}
|
|
|
|
if (page) {
|
|
if (page->index <= end_idx)
|
|
found = true;
|
|
put_page(page);
|
|
}
|
|
|
|
rcu_read_unlock();
|
|
return found;
|
|
}
|
|
|
|
static int lock_extent_direct(struct inode *inode, u64 lockstart, u64 lockend,
|
|
struct extent_state **cached_state, int writing)
|
|
{
|
|
struct btrfs_ordered_extent *ordered;
|
|
int ret = 0;
|
|
|
|
while (1) {
|
|
lock_extent_bits(&BTRFS_I(inode)->io_tree, lockstart, lockend,
|
|
cached_state);
|
|
/*
|
|
* We're concerned with the entire range that we're going to be
|
|
* doing DIO to, so we need to make sure there's no ordered
|
|
* extents in this range.
|
|
*/
|
|
ordered = btrfs_lookup_ordered_range(BTRFS_I(inode), lockstart,
|
|
lockend - lockstart + 1);
|
|
|
|
/*
|
|
* We need to make sure there are no buffered pages in this
|
|
* range either, we could have raced between the invalidate in
|
|
* generic_file_direct_write and locking the extent. The
|
|
* invalidate needs to happen so that reads after a write do not
|
|
* get stale data.
|
|
*/
|
|
if (!ordered &&
|
|
(!writing ||
|
|
!btrfs_page_exists_in_range(inode, lockstart, lockend)))
|
|
break;
|
|
|
|
unlock_extent_cached(&BTRFS_I(inode)->io_tree, lockstart, lockend,
|
|
cached_state, GFP_NOFS);
|
|
|
|
if (ordered) {
|
|
/*
|
|
* If we are doing a DIO read and the ordered extent we
|
|
* found is for a buffered write, we can not wait for it
|
|
* to complete and retry, because if we do so we can
|
|
* deadlock with concurrent buffered writes on page
|
|
* locks. This happens only if our DIO read covers more
|
|
* than one extent map, if at this point has already
|
|
* created an ordered extent for a previous extent map
|
|
* and locked its range in the inode's io tree, and a
|
|
* concurrent write against that previous extent map's
|
|
* range and this range started (we unlock the ranges
|
|
* in the io tree only when the bios complete and
|
|
* buffered writes always lock pages before attempting
|
|
* to lock range in the io tree).
|
|
*/
|
|
if (writing ||
|
|
test_bit(BTRFS_ORDERED_DIRECT, &ordered->flags))
|
|
btrfs_start_ordered_extent(inode, ordered, 1);
|
|
else
|
|
ret = -ENOTBLK;
|
|
btrfs_put_ordered_extent(ordered);
|
|
} else {
|
|
/*
|
|
* We could trigger writeback for this range (and wait
|
|
* for it to complete) and then invalidate the pages for
|
|
* this range (through invalidate_inode_pages2_range()),
|
|
* but that can lead us to a deadlock with a concurrent
|
|
* call to readpages() (a buffered read or a defrag call
|
|
* triggered a readahead) on a page lock due to an
|
|
* ordered dio extent we created before but did not have
|
|
* yet a corresponding bio submitted (whence it can not
|
|
* complete), which makes readpages() wait for that
|
|
* ordered extent to complete while holding a lock on
|
|
* that page.
|
|
*/
|
|
ret = -ENOTBLK;
|
|
}
|
|
|
|
if (ret)
|
|
break;
|
|
|
|
cond_resched();
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* The callers of this must take lock_extent() */
|
|
static struct extent_map *create_io_em(struct inode *inode, u64 start, u64 len,
|
|
u64 orig_start, u64 block_start,
|
|
u64 block_len, u64 orig_block_len,
|
|
u64 ram_bytes, int compress_type,
|
|
int type)
|
|
{
|
|
struct extent_map_tree *em_tree;
|
|
struct extent_map *em;
|
|
struct btrfs_root *root = BTRFS_I(inode)->root;
|
|
int ret;
|
|
|
|
ASSERT(type == BTRFS_ORDERED_PREALLOC ||
|
|
type == BTRFS_ORDERED_COMPRESSED ||
|
|
type == BTRFS_ORDERED_NOCOW ||
|
|
type == BTRFS_ORDERED_REGULAR);
|
|
|
|
em_tree = &BTRFS_I(inode)->extent_tree;
|
|
em = alloc_extent_map();
|
|
if (!em)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
em->start = start;
|
|
em->orig_start = orig_start;
|
|
em->len = len;
|
|
em->block_len = block_len;
|
|
em->block_start = block_start;
|
|
em->bdev = root->fs_info->fs_devices->latest_bdev;
|
|
em->orig_block_len = orig_block_len;
|
|
em->ram_bytes = ram_bytes;
|
|
em->generation = -1;
|
|
set_bit(EXTENT_FLAG_PINNED, &em->flags);
|
|
if (type == BTRFS_ORDERED_PREALLOC) {
|
|
set_bit(EXTENT_FLAG_FILLING, &em->flags);
|
|
} else if (type == BTRFS_ORDERED_COMPRESSED) {
|
|
set_bit(EXTENT_FLAG_COMPRESSED, &em->flags);
|
|
em->compress_type = compress_type;
|
|
}
|
|
|
|
do {
|
|
btrfs_drop_extent_cache(BTRFS_I(inode), em->start,
|
|
em->start + em->len - 1, 0);
|
|
write_lock(&em_tree->lock);
|
|
ret = add_extent_mapping(em_tree, em, 1);
|
|
write_unlock(&em_tree->lock);
|
|
/*
|
|
* The caller has taken lock_extent(), who could race with us
|
|
* to add em?
|
|
*/
|
|
} while (ret == -EEXIST);
|
|
|
|
if (ret) {
|
|
free_extent_map(em);
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
/* em got 2 refs now, callers needs to do free_extent_map once. */
|
|
return em;
|
|
}
|
|
|
|
static void adjust_dio_outstanding_extents(struct inode *inode,
|
|
struct btrfs_dio_data *dio_data,
|
|
const u64 len)
|
|
{
|
|
unsigned num_extents = count_max_extents(len);
|
|
|
|
/*
|
|
* If we have an outstanding_extents count still set then we're
|
|
* within our reservation, otherwise we need to adjust our inode
|
|
* counter appropriately.
|
|
*/
|
|
if (dio_data->outstanding_extents >= num_extents) {
|
|
dio_data->outstanding_extents -= num_extents;
|
|
} else {
|
|
/*
|
|
* If dio write length has been split due to no large enough
|
|
* contiguous space, we need to compensate our inode counter
|
|
* appropriately.
|
|
*/
|
|
u64 num_needed = num_extents - dio_data->outstanding_extents;
|
|
|
|
spin_lock(&BTRFS_I(inode)->lock);
|
|
BTRFS_I(inode)->outstanding_extents += num_needed;
|
|
spin_unlock(&BTRFS_I(inode)->lock);
|
|
}
|
|
}
|
|
|
|
static int btrfs_get_blocks_direct(struct inode *inode, sector_t iblock,
|
|
struct buffer_head *bh_result, int create)
|
|
{
|
|
struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
|
|
struct extent_map *em;
|
|
struct extent_state *cached_state = NULL;
|
|
struct btrfs_dio_data *dio_data = NULL;
|
|
u64 start = iblock << inode->i_blkbits;
|
|
u64 lockstart, lockend;
|
|
u64 len = bh_result->b_size;
|
|
int unlock_bits = EXTENT_LOCKED;
|
|
int ret = 0;
|
|
|
|
if (create)
|
|
unlock_bits |= EXTENT_DIRTY;
|
|
else
|
|
len = min_t(u64, len, fs_info->sectorsize);
|
|
|
|
lockstart = start;
|
|
lockend = start + len - 1;
|
|
|
|
if (current->journal_info) {
|
|
/*
|
|
* Need to pull our outstanding extents and set journal_info to NULL so
|
|
* that anything that needs to check if there's a transaction doesn't get
|
|
* confused.
|
|
*/
|
|
dio_data = current->journal_info;
|
|
current->journal_info = NULL;
|
|
}
|
|
|
|
/*
|
|
* If this errors out it's because we couldn't invalidate pagecache for
|
|
* this range and we need to fallback to buffered.
|
|
*/
|
|
if (lock_extent_direct(inode, lockstart, lockend, &cached_state,
|
|
create)) {
|
|
ret = -ENOTBLK;
|
|
goto err;
|
|
}
|
|
|
|
em = btrfs_get_extent(inode, NULL, 0, start, len, 0);
|
|
if (IS_ERR(em)) {
|
|
ret = PTR_ERR(em);
|
|
goto unlock_err;
|
|
}
|
|
|
|
/*
|
|
* Ok for INLINE and COMPRESSED extents we need to fallback on buffered
|
|
* io. INLINE is special, and we could probably kludge it in here, but
|
|
* it's still buffered so for safety lets just fall back to the generic
|
|
* buffered path.
|
|
*
|
|
* For COMPRESSED we _have_ to read the entire extent in so we can
|
|
* decompress it, so there will be buffering required no matter what we
|
|
* do, so go ahead and fallback to buffered.
|
|
*
|
|
* We return -ENOTBLK because that's what makes DIO go ahead and go back
|
|
* to buffered IO. Don't blame me, this is the price we pay for using
|
|
* the generic code.
|
|
*/
|
|
if (test_bit(EXTENT_FLAG_COMPRESSED, &em->flags) ||
|
|
em->block_start == EXTENT_MAP_INLINE) {
|
|
free_extent_map(em);
|
|
ret = -ENOTBLK;
|
|
goto unlock_err;
|
|
}
|
|
|
|
/* Just a good old fashioned hole, return */
|
|
if (!create && (em->block_start == EXTENT_MAP_HOLE ||
|
|
test_bit(EXTENT_FLAG_PREALLOC, &em->flags))) {
|
|
free_extent_map(em);
|
|
goto unlock_err;
|
|
}
|
|
|
|
/*
|
|
* We don't allocate a new extent in the following cases
|
|
*
|
|
* 1) The inode is marked as NODATACOW. In this case we'll just use the
|
|
* existing extent.
|
|
* 2) The extent is marked as PREALLOC. We're good to go here and can
|
|
* just use the extent.
|
|
*
|
|
*/
|
|
if (!create) {
|
|
len = min(len, em->len - (start - em->start));
|
|
lockstart = start + len;
|
|
goto unlock;
|
|
}
|
|
|
|
if (test_bit(EXTENT_FLAG_PREALLOC, &em->flags) ||
|
|
((BTRFS_I(inode)->flags & BTRFS_INODE_NODATACOW) &&
|
|
em->block_start != EXTENT_MAP_HOLE)) {
|
|
int type;
|
|
u64 block_start, orig_start, orig_block_len, ram_bytes;
|
|
|
|
if (test_bit(EXTENT_FLAG_PREALLOC, &em->flags))
|
|
type = BTRFS_ORDERED_PREALLOC;
|
|
else
|
|
type = BTRFS_ORDERED_NOCOW;
|
|
len = min(len, em->len - (start - em->start));
|
|
block_start = em->block_start + (start - em->start);
|
|
|
|
if (can_nocow_extent(inode, start, &len, &orig_start,
|
|
&orig_block_len, &ram_bytes) == 1 &&
|
|
btrfs_inc_nocow_writers(fs_info, block_start)) {
|
|
struct extent_map *em2;
|
|
|
|
em2 = btrfs_create_dio_extent(inode, start, len,
|
|
orig_start, block_start,
|
|
len, orig_block_len,
|
|
ram_bytes, type);
|
|
btrfs_dec_nocow_writers(fs_info, block_start);
|
|
if (type == BTRFS_ORDERED_PREALLOC) {
|
|
free_extent_map(em);
|
|
em = em2;
|
|
}
|
|
if (em2 && IS_ERR(em2)) {
|
|
ret = PTR_ERR(em2);
|
|
goto unlock_err;
|
|
}
|
|
/*
|
|
* For inode marked NODATACOW or extent marked PREALLOC,
|
|
* use the existing or preallocated extent, so does not
|
|
* need to adjust btrfs_space_info's bytes_may_use.
|
|
*/
|
|
btrfs_free_reserved_data_space_noquota(inode,
|
|
start, len);
|
|
goto unlock;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* this will cow the extent, reset the len in case we changed
|
|
* it above
|
|
*/
|
|
len = bh_result->b_size;
|
|
free_extent_map(em);
|
|
em = btrfs_new_extent_direct(inode, start, len);
|
|
if (IS_ERR(em)) {
|
|
ret = PTR_ERR(em);
|
|
goto unlock_err;
|
|
}
|
|
len = min(len, em->len - (start - em->start));
|
|
unlock:
|
|
bh_result->b_blocknr = (em->block_start + (start - em->start)) >>
|
|
inode->i_blkbits;
|
|
bh_result->b_size = len;
|
|
bh_result->b_bdev = em->bdev;
|
|
set_buffer_mapped(bh_result);
|
|
if (create) {
|
|
if (!test_bit(EXTENT_FLAG_PREALLOC, &em->flags))
|
|
set_buffer_new(bh_result);
|
|
|
|
/*
|
|
* Need to update the i_size under the extent lock so buffered
|
|
* readers will get the updated i_size when we unlock.
|
|
*/
|
|
if (!dio_data->overwrite && start + len > i_size_read(inode))
|
|
i_size_write(inode, start + len);
|
|
|
|
adjust_dio_outstanding_extents(inode, dio_data, len);
|
|
WARN_ON(dio_data->reserve < len);
|
|
dio_data->reserve -= len;
|
|
dio_data->unsubmitted_oe_range_end = start + len;
|
|
current->journal_info = dio_data;
|
|
}
|
|
|
|
/*
|
|
* In the case of write we need to clear and unlock the entire range,
|
|
* in the case of read we need to unlock only the end area that we
|
|
* aren't using if there is any left over space.
|
|
*/
|
|
if (lockstart < lockend) {
|
|
clear_extent_bit(&BTRFS_I(inode)->io_tree, lockstart,
|
|
lockend, unlock_bits, 1, 0,
|
|
&cached_state, GFP_NOFS);
|
|
} else {
|
|
free_extent_state(cached_state);
|
|
}
|
|
|
|
free_extent_map(em);
|
|
|
|
return 0;
|
|
|
|
unlock_err:
|
|
clear_extent_bit(&BTRFS_I(inode)->io_tree, lockstart, lockend,
|
|
unlock_bits, 1, 0, &cached_state, GFP_NOFS);
|
|
err:
|
|
if (dio_data)
|
|
current->journal_info = dio_data;
|
|
/*
|
|
* Compensate the delalloc release we do in btrfs_direct_IO() when we
|
|
* write less data then expected, so that we don't underflow our inode's
|
|
* outstanding extents counter.
|
|
*/
|
|
if (create && dio_data)
|
|
adjust_dio_outstanding_extents(inode, dio_data, len);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static inline int submit_dio_repair_bio(struct inode *inode, struct bio *bio,
|
|
int mirror_num)
|
|
{
|
|
struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
|
|
int ret;
|
|
|
|
BUG_ON(bio_op(bio) == REQ_OP_WRITE);
|
|
|
|
bio_get(bio);
|
|
|
|
ret = btrfs_bio_wq_end_io(fs_info, bio, BTRFS_WQ_ENDIO_DIO_REPAIR);
|
|
if (ret)
|
|
goto err;
|
|
|
|
ret = btrfs_map_bio(fs_info, bio, mirror_num, 0);
|
|
err:
|
|
bio_put(bio);
|
|
return ret;
|
|
}
|
|
|
|
static int btrfs_check_dio_repairable(struct inode *inode,
|
|
struct bio *failed_bio,
|
|
struct io_failure_record *failrec,
|
|
int failed_mirror)
|
|
{
|
|
struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
|
|
int num_copies;
|
|
|
|
num_copies = btrfs_num_copies(fs_info, failrec->logical, failrec->len);
|
|
if (num_copies == 1) {
|
|
/*
|
|
* we only have a single copy of the data, so don't bother with
|
|
* all the retry and error correction code that follows. no
|
|
* matter what the error is, it is very likely to persist.
|
|
*/
|
|
btrfs_debug(fs_info,
|
|
"Check DIO Repairable: cannot repair, num_copies=%d, next_mirror %d, failed_mirror %d",
|
|
num_copies, failrec->this_mirror, failed_mirror);
|
|
return 0;
|
|
}
|
|
|
|
failrec->failed_mirror = failed_mirror;
|
|
failrec->this_mirror++;
|
|
if (failrec->this_mirror == failed_mirror)
|
|
failrec->this_mirror++;
|
|
|
|
if (failrec->this_mirror > num_copies) {
|
|
btrfs_debug(fs_info,
|
|
"Check DIO Repairable: (fail) num_copies=%d, next_mirror %d, failed_mirror %d",
|
|
num_copies, failrec->this_mirror, failed_mirror);
|
|
return 0;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int dio_read_error(struct inode *inode, struct bio *failed_bio,
|
|
struct page *page, unsigned int pgoff,
|
|
u64 start, u64 end, int failed_mirror,
|
|
bio_end_io_t *repair_endio, void *repair_arg)
|
|
{
|
|
struct io_failure_record *failrec;
|
|
struct bio *bio;
|
|
int isector;
|
|
int read_mode = 0;
|
|
int ret;
|
|
|
|
BUG_ON(bio_op(failed_bio) == REQ_OP_WRITE);
|
|
|
|
ret = btrfs_get_io_failure_record(inode, start, end, &failrec);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = btrfs_check_dio_repairable(inode, failed_bio, failrec,
|
|
failed_mirror);
|
|
if (!ret) {
|
|
free_io_failure(BTRFS_I(inode), failrec);
|
|
return -EIO;
|
|
}
|
|
|
|
if ((failed_bio->bi_vcnt > 1)
|
|
|| (failed_bio->bi_io_vec->bv_len
|
|
> btrfs_inode_sectorsize(inode)))
|
|
read_mode |= REQ_FAILFAST_DEV;
|
|
|
|
isector = start - btrfs_io_bio(failed_bio)->logical;
|
|
isector >>= inode->i_sb->s_blocksize_bits;
|
|
bio = btrfs_create_repair_bio(inode, failed_bio, failrec, page,
|
|
pgoff, isector, repair_endio, repair_arg);
|
|
if (!bio) {
|
|
free_io_failure(BTRFS_I(inode), failrec);
|
|
return -EIO;
|
|
}
|
|
bio_set_op_attrs(bio, REQ_OP_READ, read_mode);
|
|
|
|
btrfs_debug(BTRFS_I(inode)->root->fs_info,
|
|
"Repair DIO Read Error: submitting new dio read[%#x] to this_mirror=%d, in_validation=%d\n",
|
|
read_mode, failrec->this_mirror, failrec->in_validation);
|
|
|
|
ret = submit_dio_repair_bio(inode, bio, failrec->this_mirror);
|
|
if (ret) {
|
|
free_io_failure(BTRFS_I(inode), failrec);
|
|
bio_put(bio);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
struct btrfs_retry_complete {
|
|
struct completion done;
|
|
struct inode *inode;
|
|
u64 start;
|
|
int uptodate;
|
|
};
|
|
|
|
static void btrfs_retry_endio_nocsum(struct bio *bio)
|
|
{
|
|
struct btrfs_retry_complete *done = bio->bi_private;
|
|
struct inode *inode;
|
|
struct bio_vec *bvec;
|
|
int i;
|
|
|
|
if (bio->bi_error)
|
|
goto end;
|
|
|
|
ASSERT(bio->bi_vcnt == 1);
|
|
inode = bio->bi_io_vec->bv_page->mapping->host;
|
|
ASSERT(bio->bi_io_vec->bv_len == btrfs_inode_sectorsize(inode));
|
|
|
|
done->uptodate = 1;
|
|
bio_for_each_segment_all(bvec, bio, i)
|
|
clean_io_failure(done->inode, done->start, bvec->bv_page, 0);
|
|
end:
|
|
complete(&done->done);
|
|
bio_put(bio);
|
|
}
|
|
|
|
static int __btrfs_correct_data_nocsum(struct inode *inode,
|
|
struct btrfs_io_bio *io_bio)
|
|
{
|
|
struct btrfs_fs_info *fs_info;
|
|
struct bio_vec *bvec;
|
|
struct btrfs_retry_complete done;
|
|
u64 start;
|
|
unsigned int pgoff;
|
|
u32 sectorsize;
|
|
int nr_sectors;
|
|
int i;
|
|
int ret;
|
|
|
|
fs_info = BTRFS_I(inode)->root->fs_info;
|
|
sectorsize = fs_info->sectorsize;
|
|
|
|
start = io_bio->logical;
|
|
done.inode = inode;
|
|
|
|
bio_for_each_segment_all(bvec, &io_bio->bio, i) {
|
|
nr_sectors = BTRFS_BYTES_TO_BLKS(fs_info, bvec->bv_len);
|
|
pgoff = bvec->bv_offset;
|
|
|
|
next_block_or_try_again:
|
|
done.uptodate = 0;
|
|
done.start = start;
|
|
init_completion(&done.done);
|
|
|
|
ret = dio_read_error(inode, &io_bio->bio, bvec->bv_page,
|
|
pgoff, start, start + sectorsize - 1,
|
|
io_bio->mirror_num,
|
|
btrfs_retry_endio_nocsum, &done);
|
|
if (ret)
|
|
return ret;
|
|
|
|
wait_for_completion(&done.done);
|
|
|
|
if (!done.uptodate) {
|
|
/* We might have another mirror, so try again */
|
|
goto next_block_or_try_again;
|
|
}
|
|
|
|
start += sectorsize;
|
|
|
|
if (nr_sectors--) {
|
|
pgoff += sectorsize;
|
|
goto next_block_or_try_again;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void btrfs_retry_endio(struct bio *bio)
|
|
{
|
|
struct btrfs_retry_complete *done = bio->bi_private;
|
|
struct btrfs_io_bio *io_bio = btrfs_io_bio(bio);
|
|
struct inode *inode;
|
|
struct bio_vec *bvec;
|
|
u64 start;
|
|
int uptodate;
|
|
int ret;
|
|
int i;
|
|
|
|
if (bio->bi_error)
|
|
goto end;
|
|
|
|
uptodate = 1;
|
|
|
|
start = done->start;
|
|
|
|
ASSERT(bio->bi_vcnt == 1);
|
|
inode = bio->bi_io_vec->bv_page->mapping->host;
|
|
ASSERT(bio->bi_io_vec->bv_len == btrfs_inode_sectorsize(inode));
|
|
|
|
bio_for_each_segment_all(bvec, bio, i) {
|
|
ret = __readpage_endio_check(done->inode, io_bio, i,
|
|
bvec->bv_page, bvec->bv_offset,
|
|
done->start, bvec->bv_len);
|
|
if (!ret)
|
|
clean_io_failure(done->inode, done->start,
|
|
bvec->bv_page, bvec->bv_offset);
|
|
else
|
|
uptodate = 0;
|
|
}
|
|
|
|
done->uptodate = uptodate;
|
|
end:
|
|
complete(&done->done);
|
|
bio_put(bio);
|
|
}
|
|
|
|
static int __btrfs_subio_endio_read(struct inode *inode,
|
|
struct btrfs_io_bio *io_bio, int err)
|
|
{
|
|
struct btrfs_fs_info *fs_info;
|
|
struct bio_vec *bvec;
|
|
struct btrfs_retry_complete done;
|
|
u64 start;
|
|
u64 offset = 0;
|
|
u32 sectorsize;
|
|
int nr_sectors;
|
|
unsigned int pgoff;
|
|
int csum_pos;
|
|
int i;
|
|
int ret;
|
|
|
|
fs_info = BTRFS_I(inode)->root->fs_info;
|
|
sectorsize = fs_info->sectorsize;
|
|
|
|
err = 0;
|
|
start = io_bio->logical;
|
|
done.inode = inode;
|
|
|
|
bio_for_each_segment_all(bvec, &io_bio->bio, i) {
|
|
nr_sectors = BTRFS_BYTES_TO_BLKS(fs_info, bvec->bv_len);
|
|
|
|
pgoff = bvec->bv_offset;
|
|
next_block:
|
|
csum_pos = BTRFS_BYTES_TO_BLKS(fs_info, offset);
|
|
ret = __readpage_endio_check(inode, io_bio, csum_pos,
|
|
bvec->bv_page, pgoff, start,
|
|
sectorsize);
|
|
if (likely(!ret))
|
|
goto next;
|
|
try_again:
|
|
done.uptodate = 0;
|
|
done.start = start;
|
|
init_completion(&done.done);
|
|
|
|
ret = dio_read_error(inode, &io_bio->bio, bvec->bv_page,
|
|
pgoff, start, start + sectorsize - 1,
|
|
io_bio->mirror_num,
|
|
btrfs_retry_endio, &done);
|
|
if (ret) {
|
|
err = ret;
|
|
goto next;
|
|
}
|
|
|
|
wait_for_completion(&done.done);
|
|
|
|
if (!done.uptodate) {
|
|
/* We might have another mirror, so try again */
|
|
goto try_again;
|
|
}
|
|
next:
|
|
offset += sectorsize;
|
|
start += sectorsize;
|
|
|
|
ASSERT(nr_sectors);
|
|
|
|
if (--nr_sectors) {
|
|
pgoff += sectorsize;
|
|
goto next_block;
|
|
}
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
static int btrfs_subio_endio_read(struct inode *inode,
|
|
struct btrfs_io_bio *io_bio, int err)
|
|
{
|
|
bool skip_csum = BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM;
|
|
|
|
if (skip_csum) {
|
|
if (unlikely(err))
|
|
return __btrfs_correct_data_nocsum(inode, io_bio);
|
|
else
|
|
return 0;
|
|
} else {
|
|
return __btrfs_subio_endio_read(inode, io_bio, err);
|
|
}
|
|
}
|
|
|
|
static void btrfs_endio_direct_read(struct bio *bio)
|
|
{
|
|
struct btrfs_dio_private *dip = bio->bi_private;
|
|
struct inode *inode = dip->inode;
|
|
struct bio *dio_bio;
|
|
struct btrfs_io_bio *io_bio = btrfs_io_bio(bio);
|
|
int err = bio->bi_error;
|
|
|
|
if (dip->flags & BTRFS_DIO_ORIG_BIO_SUBMITTED)
|
|
err = btrfs_subio_endio_read(inode, io_bio, err);
|
|
|
|
unlock_extent(&BTRFS_I(inode)->io_tree, dip->logical_offset,
|
|
dip->logical_offset + dip->bytes - 1);
|
|
dio_bio = dip->dio_bio;
|
|
|
|
kfree(dip);
|
|
|
|
dio_bio->bi_error = bio->bi_error;
|
|
dio_end_io(dio_bio, bio->bi_error);
|
|
|
|
if (io_bio->end_io)
|
|
io_bio->end_io(io_bio, err);
|
|
bio_put(bio);
|
|
}
|
|
|
|
static void btrfs_endio_direct_write_update_ordered(struct inode *inode,
|
|
const u64 offset,
|
|
const u64 bytes,
|
|
const int uptodate)
|
|
{
|
|
struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
|
|
struct btrfs_ordered_extent *ordered = NULL;
|
|
u64 ordered_offset = offset;
|
|
u64 ordered_bytes = bytes;
|
|
int ret;
|
|
|
|
again:
|
|
ret = btrfs_dec_test_first_ordered_pending(inode, &ordered,
|
|
&ordered_offset,
|
|
ordered_bytes,
|
|
uptodate);
|
|
if (!ret)
|
|
goto out_test;
|
|
|
|
btrfs_init_work(&ordered->work, btrfs_endio_write_helper,
|
|
finish_ordered_fn, NULL, NULL);
|
|
btrfs_queue_work(fs_info->endio_write_workers, &ordered->work);
|
|
out_test:
|
|
/*
|
|
* our bio might span multiple ordered extents. If we haven't
|
|
* completed the accounting for the whole dio, go back and try again
|
|
*/
|
|
if (ordered_offset < offset + bytes) {
|
|
ordered_bytes = offset + bytes - ordered_offset;
|
|
ordered = NULL;
|
|
goto again;
|
|
}
|
|
}
|
|
|
|
static void btrfs_endio_direct_write(struct bio *bio)
|
|
{
|
|
struct btrfs_dio_private *dip = bio->bi_private;
|
|
struct bio *dio_bio = dip->dio_bio;
|
|
|
|
btrfs_endio_direct_write_update_ordered(dip->inode,
|
|
dip->logical_offset,
|
|
dip->bytes,
|
|
!bio->bi_error);
|
|
|
|
kfree(dip);
|
|
|
|
dio_bio->bi_error = bio->bi_error;
|
|
dio_end_io(dio_bio, bio->bi_error);
|
|
bio_put(bio);
|
|
}
|
|
|
|
static int __btrfs_submit_bio_start_direct_io(struct inode *inode,
|
|
struct bio *bio, int mirror_num,
|
|
unsigned long bio_flags, u64 offset)
|
|
{
|
|
int ret;
|
|
ret = btrfs_csum_one_bio(inode, bio, offset, 1);
|
|
BUG_ON(ret); /* -ENOMEM */
|
|
return 0;
|
|
}
|
|
|
|
static void btrfs_end_dio_bio(struct bio *bio)
|
|
{
|
|
struct btrfs_dio_private *dip = bio->bi_private;
|
|
int err = bio->bi_error;
|
|
|
|
if (err)
|
|
btrfs_warn(BTRFS_I(dip->inode)->root->fs_info,
|
|
"direct IO failed ino %llu rw %d,%u sector %#Lx len %u err no %d",
|
|
btrfs_ino(BTRFS_I(dip->inode)), bio_op(bio),
|
|
bio->bi_opf,
|
|
(unsigned long long)bio->bi_iter.bi_sector,
|
|
bio->bi_iter.bi_size, err);
|
|
|
|
if (dip->subio_endio)
|
|
err = dip->subio_endio(dip->inode, btrfs_io_bio(bio), err);
|
|
|
|
if (err) {
|
|
dip->errors = 1;
|
|
|
|
/*
|
|
* before atomic variable goto zero, we must make sure
|
|
* dip->errors is perceived to be set.
|
|
*/
|
|
smp_mb__before_atomic();
|
|
}
|
|
|
|
/* if there are more bios still pending for this dio, just exit */
|
|
if (!atomic_dec_and_test(&dip->pending_bios))
|
|
goto out;
|
|
|
|
if (dip->errors) {
|
|
bio_io_error(dip->orig_bio);
|
|
} else {
|
|
dip->dio_bio->bi_error = 0;
|
|
bio_endio(dip->orig_bio);
|
|
}
|
|
out:
|
|
bio_put(bio);
|
|
}
|
|
|
|
static struct bio *btrfs_dio_bio_alloc(struct block_device *bdev,
|
|
u64 first_sector, gfp_t gfp_flags)
|
|
{
|
|
struct bio *bio;
|
|
bio = btrfs_bio_alloc(bdev, first_sector, BIO_MAX_PAGES, gfp_flags);
|
|
if (bio)
|
|
bio_associate_current(bio);
|
|
return bio;
|
|
}
|
|
|
|
static inline int btrfs_lookup_and_bind_dio_csum(struct inode *inode,
|
|
struct btrfs_dio_private *dip,
|
|
struct bio *bio,
|
|
u64 file_offset)
|
|
{
|
|
struct btrfs_io_bio *io_bio = btrfs_io_bio(bio);
|
|
struct btrfs_io_bio *orig_io_bio = btrfs_io_bio(dip->orig_bio);
|
|
int ret;
|
|
|
|
/*
|
|
* We load all the csum data we need when we submit
|
|
* the first bio to reduce the csum tree search and
|
|
* contention.
|
|
*/
|
|
if (dip->logical_offset == file_offset) {
|
|
ret = btrfs_lookup_bio_sums_dio(inode, dip->orig_bio,
|
|
file_offset);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
if (bio == dip->orig_bio)
|
|
return 0;
|
|
|
|
file_offset -= dip->logical_offset;
|
|
file_offset >>= inode->i_sb->s_blocksize_bits;
|
|
io_bio->csum = (u8 *)(((u32 *)orig_io_bio->csum) + file_offset);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline int __btrfs_submit_dio_bio(struct bio *bio, struct inode *inode,
|
|
u64 file_offset, int skip_sum,
|
|
int async_submit)
|
|
{
|
|
struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
|
|
struct btrfs_dio_private *dip = bio->bi_private;
|
|
bool write = bio_op(bio) == REQ_OP_WRITE;
|
|
int ret;
|
|
|
|
if (async_submit)
|
|
async_submit = !atomic_read(&BTRFS_I(inode)->sync_writers);
|
|
|
|
bio_get(bio);
|
|
|
|
if (!write) {
|
|
ret = btrfs_bio_wq_end_io(fs_info, bio, BTRFS_WQ_ENDIO_DATA);
|
|
if (ret)
|
|
goto err;
|
|
}
|
|
|
|
if (skip_sum)
|
|
goto map;
|
|
|
|
if (write && async_submit) {
|
|
ret = btrfs_wq_submit_bio(fs_info, inode, bio, 0, 0,
|
|
file_offset,
|
|
__btrfs_submit_bio_start_direct_io,
|
|
__btrfs_submit_bio_done);
|
|
goto err;
|
|
} else if (write) {
|
|
/*
|
|
* If we aren't doing async submit, calculate the csum of the
|
|
* bio now.
|
|
*/
|
|
ret = btrfs_csum_one_bio(inode, bio, file_offset, 1);
|
|
if (ret)
|
|
goto err;
|
|
} else {
|
|
ret = btrfs_lookup_and_bind_dio_csum(inode, dip, bio,
|
|
file_offset);
|
|
if (ret)
|
|
goto err;
|
|
}
|
|
map:
|
|
ret = btrfs_map_bio(fs_info, bio, 0, async_submit);
|
|
err:
|
|
bio_put(bio);
|
|
return ret;
|
|
}
|
|
|
|
static int btrfs_submit_direct_hook(struct btrfs_dio_private *dip,
|
|
int skip_sum)
|
|
{
|
|
struct inode *inode = dip->inode;
|
|
struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
|
|
struct btrfs_root *root = BTRFS_I(inode)->root;
|
|
struct bio *bio;
|
|
struct bio *orig_bio = dip->orig_bio;
|
|
struct bio_vec *bvec;
|
|
u64 start_sector = orig_bio->bi_iter.bi_sector;
|
|
u64 file_offset = dip->logical_offset;
|
|
u64 submit_len = 0;
|
|
u64 map_length;
|
|
u32 blocksize = fs_info->sectorsize;
|
|
int async_submit = 0;
|
|
int nr_sectors;
|
|
int ret;
|
|
int i, j;
|
|
|
|
map_length = orig_bio->bi_iter.bi_size;
|
|
ret = btrfs_map_block(fs_info, btrfs_op(orig_bio), start_sector << 9,
|
|
&map_length, NULL, 0);
|
|
if (ret)
|
|
return -EIO;
|
|
|
|
if (map_length >= orig_bio->bi_iter.bi_size) {
|
|
bio = orig_bio;
|
|
dip->flags |= BTRFS_DIO_ORIG_BIO_SUBMITTED;
|
|
goto submit;
|
|
}
|
|
|
|
/* async crcs make it difficult to collect full stripe writes. */
|
|
if (btrfs_get_alloc_profile(root, 1) & BTRFS_BLOCK_GROUP_RAID56_MASK)
|
|
async_submit = 0;
|
|
else
|
|
async_submit = 1;
|
|
|
|
bio = btrfs_dio_bio_alloc(orig_bio->bi_bdev, start_sector, GFP_NOFS);
|
|
if (!bio)
|
|
return -ENOMEM;
|
|
|
|
bio->bi_opf = orig_bio->bi_opf;
|
|
bio->bi_private = dip;
|
|
bio->bi_end_io = btrfs_end_dio_bio;
|
|
btrfs_io_bio(bio)->logical = file_offset;
|
|
atomic_inc(&dip->pending_bios);
|
|
|
|
bio_for_each_segment_all(bvec, orig_bio, j) {
|
|
nr_sectors = BTRFS_BYTES_TO_BLKS(fs_info, bvec->bv_len);
|
|
i = 0;
|
|
next_block:
|
|
if (unlikely(map_length < submit_len + blocksize ||
|
|
bio_add_page(bio, bvec->bv_page, blocksize,
|
|
bvec->bv_offset + (i * blocksize)) < blocksize)) {
|
|
/*
|
|
* inc the count before we submit the bio so
|
|
* we know the end IO handler won't happen before
|
|
* we inc the count. Otherwise, the dip might get freed
|
|
* before we're done setting it up
|
|
*/
|
|
atomic_inc(&dip->pending_bios);
|
|
ret = __btrfs_submit_dio_bio(bio, inode,
|
|
file_offset, skip_sum,
|
|
async_submit);
|
|
if (ret) {
|
|
bio_put(bio);
|
|
atomic_dec(&dip->pending_bios);
|
|
goto out_err;
|
|
}
|
|
|
|
start_sector += submit_len >> 9;
|
|
file_offset += submit_len;
|
|
|
|
submit_len = 0;
|
|
|
|
bio = btrfs_dio_bio_alloc(orig_bio->bi_bdev,
|
|
start_sector, GFP_NOFS);
|
|
if (!bio)
|
|
goto out_err;
|
|
bio->bi_opf = orig_bio->bi_opf;
|
|
bio->bi_private = dip;
|
|
bio->bi_end_io = btrfs_end_dio_bio;
|
|
btrfs_io_bio(bio)->logical = file_offset;
|
|
|
|
map_length = orig_bio->bi_iter.bi_size;
|
|
ret = btrfs_map_block(fs_info, btrfs_op(orig_bio),
|
|
start_sector << 9,
|
|
&map_length, NULL, 0);
|
|
if (ret) {
|
|
bio_put(bio);
|
|
goto out_err;
|
|
}
|
|
|
|
goto next_block;
|
|
} else {
|
|
submit_len += blocksize;
|
|
if (--nr_sectors) {
|
|
i++;
|
|
goto next_block;
|
|
}
|
|
}
|
|
}
|
|
|
|
submit:
|
|
ret = __btrfs_submit_dio_bio(bio, inode, file_offset, skip_sum,
|
|
async_submit);
|
|
if (!ret)
|
|
return 0;
|
|
|
|
bio_put(bio);
|
|
out_err:
|
|
dip->errors = 1;
|
|
/*
|
|
* before atomic variable goto zero, we must
|
|
* make sure dip->errors is perceived to be set.
|
|
*/
|
|
smp_mb__before_atomic();
|
|
if (atomic_dec_and_test(&dip->pending_bios))
|
|
bio_io_error(dip->orig_bio);
|
|
|
|
/* bio_end_io() will handle error, so we needn't return it */
|
|
return 0;
|
|
}
|
|
|
|
static void btrfs_submit_direct(struct bio *dio_bio, struct inode *inode,
|
|
loff_t file_offset)
|
|
{
|
|
struct btrfs_dio_private *dip = NULL;
|
|
struct bio *io_bio = NULL;
|
|
struct btrfs_io_bio *btrfs_bio;
|
|
int skip_sum;
|
|
bool write = (bio_op(dio_bio) == REQ_OP_WRITE);
|
|
int ret = 0;
|
|
|
|
skip_sum = BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM;
|
|
|
|
io_bio = btrfs_bio_clone(dio_bio, GFP_NOFS);
|
|
if (!io_bio) {
|
|
ret = -ENOMEM;
|
|
goto free_ordered;
|
|
}
|
|
|
|
dip = kzalloc(sizeof(*dip), GFP_NOFS);
|
|
if (!dip) {
|
|
ret = -ENOMEM;
|
|
goto free_ordered;
|
|
}
|
|
|
|
dip->private = dio_bio->bi_private;
|
|
dip->inode = inode;
|
|
dip->logical_offset = file_offset;
|
|
dip->bytes = dio_bio->bi_iter.bi_size;
|
|
dip->disk_bytenr = (u64)dio_bio->bi_iter.bi_sector << 9;
|
|
io_bio->bi_private = dip;
|
|
dip->orig_bio = io_bio;
|
|
dip->dio_bio = dio_bio;
|
|
atomic_set(&dip->pending_bios, 0);
|
|
btrfs_bio = btrfs_io_bio(io_bio);
|
|
btrfs_bio->logical = file_offset;
|
|
|
|
if (write) {
|
|
io_bio->bi_end_io = btrfs_endio_direct_write;
|
|
} else {
|
|
io_bio->bi_end_io = btrfs_endio_direct_read;
|
|
dip->subio_endio = btrfs_subio_endio_read;
|
|
}
|
|
|
|
/*
|
|
* Reset the range for unsubmitted ordered extents (to a 0 length range)
|
|
* even if we fail to submit a bio, because in such case we do the
|
|
* corresponding error handling below and it must not be done a second
|
|
* time by btrfs_direct_IO().
|
|
*/
|
|
if (write) {
|
|
struct btrfs_dio_data *dio_data = current->journal_info;
|
|
|
|
dio_data->unsubmitted_oe_range_end = dip->logical_offset +
|
|
dip->bytes;
|
|
dio_data->unsubmitted_oe_range_start =
|
|
dio_data->unsubmitted_oe_range_end;
|
|
}
|
|
|
|
ret = btrfs_submit_direct_hook(dip, skip_sum);
|
|
if (!ret)
|
|
return;
|
|
|
|
if (btrfs_bio->end_io)
|
|
btrfs_bio->end_io(btrfs_bio, ret);
|
|
|
|
free_ordered:
|
|
/*
|
|
* If we arrived here it means either we failed to submit the dip
|
|
* or we either failed to clone the dio_bio or failed to allocate the
|
|
* dip. If we cloned the dio_bio and allocated the dip, we can just
|
|
* call bio_endio against our io_bio so that we get proper resource
|
|
* cleanup if we fail to submit the dip, otherwise, we must do the
|
|
* same as btrfs_endio_direct_[write|read] because we can't call these
|
|
* callbacks - they require an allocated dip and a clone of dio_bio.
|
|
*/
|
|
if (io_bio && dip) {
|
|
io_bio->bi_error = -EIO;
|
|
bio_endio(io_bio);
|
|
/*
|
|
* The end io callbacks free our dip, do the final put on io_bio
|
|
* and all the cleanup and final put for dio_bio (through
|
|
* dio_end_io()).
|
|
*/
|
|
dip = NULL;
|
|
io_bio = NULL;
|
|
} else {
|
|
if (write)
|
|
btrfs_endio_direct_write_update_ordered(inode,
|
|
file_offset,
|
|
dio_bio->bi_iter.bi_size,
|
|
0);
|
|
else
|
|
unlock_extent(&BTRFS_I(inode)->io_tree, file_offset,
|
|
file_offset + dio_bio->bi_iter.bi_size - 1);
|
|
|
|
dio_bio->bi_error = -EIO;
|
|
/*
|
|
* Releases and cleans up our dio_bio, no need to bio_put()
|
|
* nor bio_endio()/bio_io_error() against dio_bio.
|
|
*/
|
|
dio_end_io(dio_bio, ret);
|
|
}
|
|
if (io_bio)
|
|
bio_put(io_bio);
|
|
kfree(dip);
|
|
}
|
|
|
|
static ssize_t check_direct_IO(struct btrfs_fs_info *fs_info,
|
|
struct kiocb *iocb,
|
|
const struct iov_iter *iter, loff_t offset)
|
|
{
|
|
int seg;
|
|
int i;
|
|
unsigned int blocksize_mask = fs_info->sectorsize - 1;
|
|
ssize_t retval = -EINVAL;
|
|
|
|
if (offset & blocksize_mask)
|
|
goto out;
|
|
|
|
if (iov_iter_alignment(iter) & blocksize_mask)
|
|
goto out;
|
|
|
|
/* If this is a write we don't need to check anymore */
|
|
if (iov_iter_rw(iter) != READ || !iter_is_iovec(iter))
|
|
return 0;
|
|
/*
|
|
* Check to make sure we don't have duplicate iov_base's in this
|
|
* iovec, if so return EINVAL, otherwise we'll get csum errors
|
|
* when reading back.
|
|
*/
|
|
for (seg = 0; seg < iter->nr_segs; seg++) {
|
|
for (i = seg + 1; i < iter->nr_segs; i++) {
|
|
if (iter->iov[seg].iov_base == iter->iov[i].iov_base)
|
|
goto out;
|
|
}
|
|
}
|
|
retval = 0;
|
|
out:
|
|
return retval;
|
|
}
|
|
|
|
static ssize_t btrfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
|
|
{
|
|
struct file *file = iocb->ki_filp;
|
|
struct inode *inode = file->f_mapping->host;
|
|
struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
|
|
struct btrfs_dio_data dio_data = { 0 };
|
|
loff_t offset = iocb->ki_pos;
|
|
size_t count = 0;
|
|
int flags = 0;
|
|
bool wakeup = true;
|
|
bool relock = false;
|
|
ssize_t ret;
|
|
|
|
if (check_direct_IO(fs_info, iocb, iter, offset))
|
|
return 0;
|
|
|
|
inode_dio_begin(inode);
|
|
smp_mb__after_atomic();
|
|
|
|
/*
|
|
* The generic stuff only does filemap_write_and_wait_range, which
|
|
* isn't enough if we've written compressed pages to this area, so
|
|
* we need to flush the dirty pages again to make absolutely sure
|
|
* that any outstanding dirty pages are on disk.
|
|
*/
|
|
count = iov_iter_count(iter);
|
|
if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT,
|
|
&BTRFS_I(inode)->runtime_flags))
|
|
filemap_fdatawrite_range(inode->i_mapping, offset,
|
|
offset + count - 1);
|
|
|
|
if (iov_iter_rw(iter) == WRITE) {
|
|
/*
|
|
* If the write DIO is beyond the EOF, we need update
|
|
* the isize, but it is protected by i_mutex. So we can
|
|
* not unlock the i_mutex at this case.
|
|
*/
|
|
if (offset + count <= inode->i_size) {
|
|
dio_data.overwrite = 1;
|
|
inode_unlock(inode);
|
|
relock = true;
|
|
}
|
|
ret = btrfs_delalloc_reserve_space(inode, offset, count);
|
|
if (ret)
|
|
goto out;
|
|
dio_data.outstanding_extents = count_max_extents(count);
|
|
|
|
/*
|
|
* We need to know how many extents we reserved so that we can
|
|
* do the accounting properly if we go over the number we
|
|
* originally calculated. Abuse current->journal_info for this.
|
|
*/
|
|
dio_data.reserve = round_up(count,
|
|
fs_info->sectorsize);
|
|
dio_data.unsubmitted_oe_range_start = (u64)offset;
|
|
dio_data.unsubmitted_oe_range_end = (u64)offset;
|
|
current->journal_info = &dio_data;
|
|
down_read(&BTRFS_I(inode)->dio_sem);
|
|
} else if (test_bit(BTRFS_INODE_READDIO_NEED_LOCK,
|
|
&BTRFS_I(inode)->runtime_flags)) {
|
|
inode_dio_end(inode);
|
|
flags = DIO_LOCKING | DIO_SKIP_HOLES;
|
|
wakeup = false;
|
|
}
|
|
|
|
ret = __blockdev_direct_IO(iocb, inode,
|
|
fs_info->fs_devices->latest_bdev,
|
|
iter, btrfs_get_blocks_direct, NULL,
|
|
btrfs_submit_direct, flags);
|
|
if (iov_iter_rw(iter) == WRITE) {
|
|
up_read(&BTRFS_I(inode)->dio_sem);
|
|
current->journal_info = NULL;
|
|
if (ret < 0 && ret != -EIOCBQUEUED) {
|
|
if (dio_data.reserve)
|
|
btrfs_delalloc_release_space(inode, offset,
|
|
dio_data.reserve);
|
|
/*
|
|
* On error we might have left some ordered extents
|
|
* without submitting corresponding bios for them, so
|
|
* cleanup them up to avoid other tasks getting them
|
|
* and waiting for them to complete forever.
|
|
*/
|
|
if (dio_data.unsubmitted_oe_range_start <
|
|
dio_data.unsubmitted_oe_range_end)
|
|
btrfs_endio_direct_write_update_ordered(inode,
|
|
dio_data.unsubmitted_oe_range_start,
|
|
dio_data.unsubmitted_oe_range_end -
|
|
dio_data.unsubmitted_oe_range_start,
|
|
0);
|
|
} else if (ret >= 0 && (size_t)ret < count)
|
|
btrfs_delalloc_release_space(inode, offset,
|
|
count - (size_t)ret);
|
|
}
|
|
out:
|
|
if (wakeup)
|
|
inode_dio_end(inode);
|
|
if (relock)
|
|
inode_lock(inode);
|
|
|
|
return ret;
|
|
}
|
|
|
|
#define BTRFS_FIEMAP_FLAGS (FIEMAP_FLAG_SYNC)
|
|
|
|
static int btrfs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
|
|
__u64 start, __u64 len)
|
|
{
|
|
int ret;
|
|
|
|
ret = fiemap_check_flags(fieinfo, BTRFS_FIEMAP_FLAGS);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return extent_fiemap(inode, fieinfo, start, len, btrfs_get_extent_fiemap);
|
|
}
|
|
|
|
int btrfs_readpage(struct file *file, struct page *page)
|
|
{
|
|
struct extent_io_tree *tree;
|
|
tree = &BTRFS_I(page->mapping->host)->io_tree;
|
|
return extent_read_full_page(tree, page, btrfs_get_extent, 0);
|
|
}
|
|
|
|
static int btrfs_writepage(struct page *page, struct writeback_control *wbc)
|
|
{
|
|
struct extent_io_tree *tree;
|
|
struct inode *inode = page->mapping->host;
|
|
int ret;
|
|
|
|
if (current->flags & PF_MEMALLOC) {
|
|
redirty_page_for_writepage(wbc, page);
|
|
unlock_page(page);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* If we are under memory pressure we will call this directly from the
|
|
* VM, we need to make sure we have the inode referenced for the ordered
|
|
* extent. If not just return like we didn't do anything.
|
|
*/
|
|
if (!igrab(inode)) {
|
|
redirty_page_for_writepage(wbc, page);
|
|
return AOP_WRITEPAGE_ACTIVATE;
|
|
}
|
|
tree = &BTRFS_I(page->mapping->host)->io_tree;
|
|
ret = extent_write_full_page(tree, page, btrfs_get_extent, wbc);
|
|
btrfs_add_delayed_iput(inode);
|
|
return ret;
|
|
}
|
|
|
|
static int btrfs_writepages(struct address_space *mapping,
|
|
struct writeback_control *wbc)
|
|
{
|
|
struct extent_io_tree *tree;
|
|
|
|
tree = &BTRFS_I(mapping->host)->io_tree;
|
|
return extent_writepages(tree, mapping, btrfs_get_extent, wbc);
|
|
}
|
|
|
|
static int
|
|
btrfs_readpages(struct file *file, struct address_space *mapping,
|
|
struct list_head *pages, unsigned nr_pages)
|
|
{
|
|
struct extent_io_tree *tree;
|
|
tree = &BTRFS_I(mapping->host)->io_tree;
|
|
return extent_readpages(tree, mapping, pages, nr_pages,
|
|
btrfs_get_extent);
|
|
}
|
|
static int __btrfs_releasepage(struct page *page, gfp_t gfp_flags)
|
|
{
|
|
struct extent_io_tree *tree;
|
|
struct extent_map_tree *map;
|
|
int ret;
|
|
|
|
tree = &BTRFS_I(page->mapping->host)->io_tree;
|
|
map = &BTRFS_I(page->mapping->host)->extent_tree;
|
|
ret = try_release_extent_mapping(map, tree, page, gfp_flags);
|
|
if (ret == 1) {
|
|
ClearPagePrivate(page);
|
|
set_page_private(page, 0);
|
|
put_page(page);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int btrfs_releasepage(struct page *page, gfp_t gfp_flags)
|
|
{
|
|
if (PageWriteback(page) || PageDirty(page))
|
|
return 0;
|
|
return __btrfs_releasepage(page, gfp_flags);
|
|
}
|
|
|
|
static void btrfs_invalidatepage(struct page *page, unsigned int offset,
|
|
unsigned int length)
|
|
{
|
|
struct inode *inode = page->mapping->host;
|
|
struct extent_io_tree *tree;
|
|
struct btrfs_ordered_extent *ordered;
|
|
struct extent_state *cached_state = NULL;
|
|
u64 page_start = page_offset(page);
|
|
u64 page_end = page_start + PAGE_SIZE - 1;
|
|
u64 start;
|
|
u64 end;
|
|
int inode_evicting = inode->i_state & I_FREEING;
|
|
|
|
/*
|
|
* we have the page locked, so new writeback can't start,
|
|
* and the dirty bit won't be cleared while we are here.
|
|
*
|
|
* Wait for IO on this page so that we can safely clear
|
|
* the PagePrivate2 bit and do ordered accounting
|
|
*/
|
|
wait_on_page_writeback(page);
|
|
|
|
tree = &BTRFS_I(inode)->io_tree;
|
|
if (offset) {
|
|
btrfs_releasepage(page, GFP_NOFS);
|
|
return;
|
|
}
|
|
|
|
if (!inode_evicting)
|
|
lock_extent_bits(tree, page_start, page_end, &cached_state);
|
|
again:
|
|
start = page_start;
|
|
ordered = btrfs_lookup_ordered_range(BTRFS_I(inode), start,
|
|
page_end - start + 1);
|
|
if (ordered) {
|
|
end = min(page_end, ordered->file_offset + ordered->len - 1);
|
|
/*
|
|
* IO on this page will never be started, so we need
|
|
* to account for any ordered extents now
|
|
*/
|
|
if (!inode_evicting)
|
|
clear_extent_bit(tree, start, end,
|
|
EXTENT_DIRTY | EXTENT_DELALLOC |
|
|
EXTENT_LOCKED | EXTENT_DO_ACCOUNTING |
|
|
EXTENT_DEFRAG, 1, 0, &cached_state,
|
|
GFP_NOFS);
|
|
/*
|
|
* whoever cleared the private bit is responsible
|
|
* for the finish_ordered_io
|
|
*/
|
|
if (TestClearPagePrivate2(page)) {
|
|
struct btrfs_ordered_inode_tree *tree;
|
|
u64 new_len;
|
|
|
|
tree = &BTRFS_I(inode)->ordered_tree;
|
|
|
|
spin_lock_irq(&tree->lock);
|
|
set_bit(BTRFS_ORDERED_TRUNCATED, &ordered->flags);
|
|
new_len = start - ordered->file_offset;
|
|
if (new_len < ordered->truncated_len)
|
|
ordered->truncated_len = new_len;
|
|
spin_unlock_irq(&tree->lock);
|
|
|
|
if (btrfs_dec_test_ordered_pending(inode, &ordered,
|
|
start,
|
|
end - start + 1, 1))
|
|
btrfs_finish_ordered_io(ordered);
|
|
}
|
|
btrfs_put_ordered_extent(ordered);
|
|
if (!inode_evicting) {
|
|
cached_state = NULL;
|
|
lock_extent_bits(tree, start, end,
|
|
&cached_state);
|
|
}
|
|
|
|
start = end + 1;
|
|
if (start < page_end)
|
|
goto again;
|
|
}
|
|
|
|
/*
|
|
* Qgroup reserved space handler
|
|
* Page here will be either
|
|
* 1) Already written to disk
|
|
* In this case, its reserved space is released from data rsv map
|
|
* and will be freed by delayed_ref handler finally.
|
|
* So even we call qgroup_free_data(), it won't decrease reserved
|
|
* space.
|
|
* 2) Not written to disk
|
|
* This means the reserved space should be freed here. However,
|
|
* if a truncate invalidates the page (by clearing PageDirty)
|
|
* and the page is accounted for while allocating extent
|
|
* in btrfs_check_data_free_space() we let delayed_ref to
|
|
* free the entire extent.
|
|
*/
|
|
if (PageDirty(page))
|
|
btrfs_qgroup_free_data(inode, page_start, PAGE_SIZE);
|
|
if (!inode_evicting) {
|
|
clear_extent_bit(tree, page_start, page_end,
|
|
EXTENT_LOCKED | EXTENT_DIRTY |
|
|
EXTENT_DELALLOC | EXTENT_DO_ACCOUNTING |
|
|
EXTENT_DEFRAG, 1, 1,
|
|
&cached_state, GFP_NOFS);
|
|
|
|
__btrfs_releasepage(page, GFP_NOFS);
|
|
}
|
|
|
|
ClearPageChecked(page);
|
|
if (PagePrivate(page)) {
|
|
ClearPagePrivate(page);
|
|
set_page_private(page, 0);
|
|
put_page(page);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* btrfs_page_mkwrite() is not allowed to change the file size as it gets
|
|
* called from a page fault handler when a page is first dirtied. Hence we must
|
|
* be careful to check for EOF conditions here. We set the page up correctly
|
|
* for a written page which means we get ENOSPC checking when writing into
|
|
* holes and correct delalloc and unwritten extent mapping on filesystems that
|
|
* support these features.
|
|
*
|
|
* We are not allowed to take the i_mutex here so we have to play games to
|
|
* protect against truncate races as the page could now be beyond EOF. Because
|
|
* vmtruncate() writes the inode size before removing pages, once we have the
|
|
* page lock we can determine safely if the page is beyond EOF. If it is not
|
|
* beyond EOF, then the page is guaranteed safe against truncation until we
|
|
* unlock the page.
|
|
*/
|
|
int btrfs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
|
|
{
|
|
struct page *page = vmf->page;
|
|
struct inode *inode = file_inode(vma->vm_file);
|
|
struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
|
|
struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
|
|
struct btrfs_ordered_extent *ordered;
|
|
struct extent_state *cached_state = NULL;
|
|
char *kaddr;
|
|
unsigned long zero_start;
|
|
loff_t size;
|
|
int ret;
|
|
int reserved = 0;
|
|
u64 reserved_space;
|
|
u64 page_start;
|
|
u64 page_end;
|
|
u64 end;
|
|
|
|
reserved_space = PAGE_SIZE;
|
|
|
|
sb_start_pagefault(inode->i_sb);
|
|
page_start = page_offset(page);
|
|
page_end = page_start + PAGE_SIZE - 1;
|
|
end = page_end;
|
|
|
|
/*
|
|
* Reserving delalloc space after obtaining the page lock can lead to
|
|
* deadlock. For example, if a dirty page is locked by this function
|
|
* and the call to btrfs_delalloc_reserve_space() ends up triggering
|
|
* dirty page write out, then the btrfs_writepage() function could
|
|
* end up waiting indefinitely to get a lock on the page currently
|
|
* being processed by btrfs_page_mkwrite() function.
|
|
*/
|
|
ret = btrfs_delalloc_reserve_space(inode, page_start,
|
|
reserved_space);
|
|
if (!ret) {
|
|
ret = file_update_time(vma->vm_file);
|
|
reserved = 1;
|
|
}
|
|
if (ret) {
|
|
if (ret == -ENOMEM)
|
|
ret = VM_FAULT_OOM;
|
|
else /* -ENOSPC, -EIO, etc */
|
|
ret = VM_FAULT_SIGBUS;
|
|
if (reserved)
|
|
goto out;
|
|
goto out_noreserve;
|
|
}
|
|
|
|
ret = VM_FAULT_NOPAGE; /* make the VM retry the fault */
|
|
again:
|
|
lock_page(page);
|
|
size = i_size_read(inode);
|
|
|
|
if ((page->mapping != inode->i_mapping) ||
|
|
(page_start >= size)) {
|
|
/* page got truncated out from underneath us */
|
|
goto out_unlock;
|
|
}
|
|
wait_on_page_writeback(page);
|
|
|
|
lock_extent_bits(io_tree, page_start, page_end, &cached_state);
|
|
set_page_extent_mapped(page);
|
|
|
|
/*
|
|
* we can't set the delalloc bits if there are pending ordered
|
|
* extents. Drop our locks and wait for them to finish
|
|
*/
|
|
ordered = btrfs_lookup_ordered_range(BTRFS_I(inode), page_start,
|
|
PAGE_SIZE);
|
|
if (ordered) {
|
|
unlock_extent_cached(io_tree, page_start, page_end,
|
|
&cached_state, GFP_NOFS);
|
|
unlock_page(page);
|
|
btrfs_start_ordered_extent(inode, ordered, 1);
|
|
btrfs_put_ordered_extent(ordered);
|
|
goto again;
|
|
}
|
|
|
|
if (page->index == ((size - 1) >> PAGE_SHIFT)) {
|
|
reserved_space = round_up(size - page_start,
|
|
fs_info->sectorsize);
|
|
if (reserved_space < PAGE_SIZE) {
|
|
end = page_start + reserved_space - 1;
|
|
spin_lock(&BTRFS_I(inode)->lock);
|
|
BTRFS_I(inode)->outstanding_extents++;
|
|
spin_unlock(&BTRFS_I(inode)->lock);
|
|
btrfs_delalloc_release_space(inode, page_start,
|
|
PAGE_SIZE - reserved_space);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* page_mkwrite gets called when the page is firstly dirtied after it's
|
|
* faulted in, but write(2) could also dirty a page and set delalloc
|
|
* bits, thus in this case for space account reason, we still need to
|
|
* clear any delalloc bits within this page range since we have to
|
|
* reserve data&meta space before lock_page() (see above comments).
|
|
*/
|
|
clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start, end,
|
|
EXTENT_DIRTY | EXTENT_DELALLOC |
|
|
EXTENT_DO_ACCOUNTING | EXTENT_DEFRAG,
|
|
0, 0, &cached_state, GFP_NOFS);
|
|
|
|
ret = btrfs_set_extent_delalloc(inode, page_start, end,
|
|
&cached_state, 0);
|
|
if (ret) {
|
|
unlock_extent_cached(io_tree, page_start, page_end,
|
|
&cached_state, GFP_NOFS);
|
|
ret = VM_FAULT_SIGBUS;
|
|
goto out_unlock;
|
|
}
|
|
ret = 0;
|
|
|
|
/* page is wholly or partially inside EOF */
|
|
if (page_start + PAGE_SIZE > size)
|
|
zero_start = size & ~PAGE_MASK;
|
|
else
|
|
zero_start = PAGE_SIZE;
|
|
|
|
if (zero_start != PAGE_SIZE) {
|
|
kaddr = kmap(page);
|
|
memset(kaddr + zero_start, 0, PAGE_SIZE - zero_start);
|
|
flush_dcache_page(page);
|
|
kunmap(page);
|
|
}
|
|
ClearPageChecked(page);
|
|
set_page_dirty(page);
|
|
SetPageUptodate(page);
|
|
|
|
BTRFS_I(inode)->last_trans = fs_info->generation;
|
|
BTRFS_I(inode)->last_sub_trans = BTRFS_I(inode)->root->log_transid;
|
|
BTRFS_I(inode)->last_log_commit = BTRFS_I(inode)->root->last_log_commit;
|
|
|
|
unlock_extent_cached(io_tree, page_start, page_end, &cached_state, GFP_NOFS);
|
|
|
|
out_unlock:
|
|
if (!ret) {
|
|
sb_end_pagefault(inode->i_sb);
|
|
return VM_FAULT_LOCKED;
|
|
}
|
|
unlock_page(page);
|
|
out:
|
|
btrfs_delalloc_release_space(inode, page_start, reserved_space);
|
|
out_noreserve:
|
|
sb_end_pagefault(inode->i_sb);
|
|
return ret;
|
|
}
|
|
|
|
static int btrfs_truncate(struct inode *inode)
|
|
{
|
|
struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
|
|
struct btrfs_root *root = BTRFS_I(inode)->root;
|
|
struct btrfs_block_rsv *rsv;
|
|
int ret = 0;
|
|
int err = 0;
|
|
struct btrfs_trans_handle *trans;
|
|
u64 mask = fs_info->sectorsize - 1;
|
|
u64 min_size = btrfs_calc_trunc_metadata_size(fs_info, 1);
|
|
|
|
ret = btrfs_wait_ordered_range(inode, inode->i_size & (~mask),
|
|
(u64)-1);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/*
|
|
* Yes ladies and gentlemen, this is indeed ugly. The fact is we have
|
|
* 3 things going on here
|
|
*
|
|
* 1) We need to reserve space for our orphan item and the space to
|
|
* delete our orphan item. Lord knows we don't want to have a dangling
|
|
* orphan item because we didn't reserve space to remove it.
|
|
*
|
|
* 2) We need to reserve space to update our inode.
|
|
*
|
|
* 3) We need to have something to cache all the space that is going to
|
|
* be free'd up by the truncate operation, but also have some slack
|
|
* space reserved in case it uses space during the truncate (thank you
|
|
* very much snapshotting).
|
|
*
|
|
* And we need these to all be separate. The fact is we can use a lot of
|
|
* space doing the truncate, and we have no earthly idea how much space
|
|
* we will use, so we need the truncate reservation to be separate so it
|
|
* doesn't end up using space reserved for updating the inode or
|
|
* removing the orphan item. We also need to be able to stop the
|
|
* transaction and start a new one, which means we need to be able to
|
|
* update the inode several times, and we have no idea of knowing how
|
|
* many times that will be, so we can't just reserve 1 item for the
|
|
* entirety of the operation, so that has to be done separately as well.
|
|
* Then there is the orphan item, which does indeed need to be held on
|
|
* to for the whole operation, and we need nobody to touch this reserved
|
|
* space except the orphan code.
|
|
*
|
|
* So that leaves us with
|
|
*
|
|
* 1) root->orphan_block_rsv - for the orphan deletion.
|
|
* 2) rsv - for the truncate reservation, which we will steal from the
|
|
* transaction reservation.
|
|
* 3) fs_info->trans_block_rsv - this will have 1 items worth left for
|
|
* updating the inode.
|
|
*/
|
|
rsv = btrfs_alloc_block_rsv(fs_info, BTRFS_BLOCK_RSV_TEMP);
|
|
if (!rsv)
|
|
return -ENOMEM;
|
|
rsv->size = min_size;
|
|
rsv->failfast = 1;
|
|
|
|
/*
|
|
* 1 for the truncate slack space
|
|
* 1 for updating the inode.
|
|
*/
|
|
trans = btrfs_start_transaction(root, 2);
|
|
if (IS_ERR(trans)) {
|
|
err = PTR_ERR(trans);
|
|
goto out;
|
|
}
|
|
|
|
/* Migrate the slack space for the truncate to our reserve */
|
|
ret = btrfs_block_rsv_migrate(&fs_info->trans_block_rsv, rsv,
|
|
min_size, 0);
|
|
BUG_ON(ret);
|
|
|
|
/*
|
|
* So if we truncate and then write and fsync we normally would just
|
|
* write the extents that changed, which is a problem if we need to
|
|
* first truncate that entire inode. So set this flag so we write out
|
|
* all of the extents in the inode to the sync log so we're completely
|
|
* safe.
|
|
*/
|
|
set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, &BTRFS_I(inode)->runtime_flags);
|
|
trans->block_rsv = rsv;
|
|
|
|
while (1) {
|
|
ret = btrfs_truncate_inode_items(trans, root, inode,
|
|
inode->i_size,
|
|
BTRFS_EXTENT_DATA_KEY);
|
|
if (ret != -ENOSPC && ret != -EAGAIN) {
|
|
err = ret;
|
|
break;
|
|
}
|
|
|
|
trans->block_rsv = &fs_info->trans_block_rsv;
|
|
ret = btrfs_update_inode(trans, root, inode);
|
|
if (ret) {
|
|
err = ret;
|
|
break;
|
|
}
|
|
|
|
btrfs_end_transaction(trans);
|
|
btrfs_btree_balance_dirty(fs_info);
|
|
|
|
trans = btrfs_start_transaction(root, 2);
|
|
if (IS_ERR(trans)) {
|
|
ret = err = PTR_ERR(trans);
|
|
trans = NULL;
|
|
break;
|
|
}
|
|
|
|
btrfs_block_rsv_release(fs_info, rsv, -1);
|
|
ret = btrfs_block_rsv_migrate(&fs_info->trans_block_rsv,
|
|
rsv, min_size, 0);
|
|
BUG_ON(ret); /* shouldn't happen */
|
|
trans->block_rsv = rsv;
|
|
}
|
|
|
|
if (ret == 0 && inode->i_nlink > 0) {
|
|
trans->block_rsv = root->orphan_block_rsv;
|
|
ret = btrfs_orphan_del(trans, inode);
|
|
if (ret)
|
|
err = ret;
|
|
}
|
|
|
|
if (trans) {
|
|
trans->block_rsv = &fs_info->trans_block_rsv;
|
|
ret = btrfs_update_inode(trans, root, inode);
|
|
if (ret && !err)
|
|
err = ret;
|
|
|
|
ret = btrfs_end_transaction(trans);
|
|
btrfs_btree_balance_dirty(fs_info);
|
|
}
|
|
out:
|
|
btrfs_free_block_rsv(fs_info, rsv);
|
|
|
|
if (ret && !err)
|
|
err = ret;
|
|
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* create a new subvolume directory/inode (helper for the ioctl).
|
|
*/
|
|
int btrfs_create_subvol_root(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *new_root,
|
|
struct btrfs_root *parent_root,
|
|
u64 new_dirid)
|
|
{
|
|
struct inode *inode;
|
|
int err;
|
|
u64 index = 0;
|
|
|
|
inode = btrfs_new_inode(trans, new_root, NULL, "..", 2,
|
|
new_dirid, new_dirid,
|
|
S_IFDIR | (~current_umask() & S_IRWXUGO),
|
|
&index);
|
|
if (IS_ERR(inode))
|
|
return PTR_ERR(inode);
|
|
inode->i_op = &btrfs_dir_inode_operations;
|
|
inode->i_fop = &btrfs_dir_file_operations;
|
|
|
|
set_nlink(inode, 1);
|
|
btrfs_i_size_write(BTRFS_I(inode), 0);
|
|
unlock_new_inode(inode);
|
|
|
|
err = btrfs_subvol_inherit_props(trans, new_root, parent_root);
|
|
if (err)
|
|
btrfs_err(new_root->fs_info,
|
|
"error inheriting subvolume %llu properties: %d",
|
|
new_root->root_key.objectid, err);
|
|
|
|
err = btrfs_update_inode(trans, new_root, inode);
|
|
|
|
iput(inode);
|
|
return err;
|
|
}
|
|
|
|
struct inode *btrfs_alloc_inode(struct super_block *sb)
|
|
{
|
|
struct btrfs_inode *ei;
|
|
struct inode *inode;
|
|
|
|
ei = kmem_cache_alloc(btrfs_inode_cachep, GFP_NOFS);
|
|
if (!ei)
|
|
return NULL;
|
|
|
|
ei->root = NULL;
|
|
ei->generation = 0;
|
|
ei->last_trans = 0;
|
|
ei->last_sub_trans = 0;
|
|
ei->logged_trans = 0;
|
|
ei->delalloc_bytes = 0;
|
|
ei->defrag_bytes = 0;
|
|
ei->disk_i_size = 0;
|
|
ei->flags = 0;
|
|
ei->csum_bytes = 0;
|
|
ei->index_cnt = (u64)-1;
|
|
ei->dir_index = 0;
|
|
ei->last_unlink_trans = 0;
|
|
ei->last_log_commit = 0;
|
|
ei->delayed_iput_count = 0;
|
|
|
|
spin_lock_init(&ei->lock);
|
|
ei->outstanding_extents = 0;
|
|
ei->reserved_extents = 0;
|
|
|
|
ei->runtime_flags = 0;
|
|
ei->force_compress = BTRFS_COMPRESS_NONE;
|
|
|
|
ei->delayed_node = NULL;
|
|
|
|
ei->i_otime.tv_sec = 0;
|
|
ei->i_otime.tv_nsec = 0;
|
|
|
|
inode = &ei->vfs_inode;
|
|
extent_map_tree_init(&ei->extent_tree);
|
|
extent_io_tree_init(&ei->io_tree, &inode->i_data);
|
|
extent_io_tree_init(&ei->io_failure_tree, &inode->i_data);
|
|
ei->io_tree.track_uptodate = 1;
|
|
ei->io_failure_tree.track_uptodate = 1;
|
|
atomic_set(&ei->sync_writers, 0);
|
|
mutex_init(&ei->log_mutex);
|
|
mutex_init(&ei->delalloc_mutex);
|
|
btrfs_ordered_inode_tree_init(&ei->ordered_tree);
|
|
INIT_LIST_HEAD(&ei->delalloc_inodes);
|
|
INIT_LIST_HEAD(&ei->delayed_iput);
|
|
RB_CLEAR_NODE(&ei->rb_node);
|
|
init_rwsem(&ei->dio_sem);
|
|
|
|
return inode;
|
|
}
|
|
|
|
#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
|
|
void btrfs_test_destroy_inode(struct inode *inode)
|
|
{
|
|
btrfs_drop_extent_cache(BTRFS_I(inode), 0, (u64)-1, 0);
|
|
kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode));
|
|
}
|
|
#endif
|
|
|
|
static void btrfs_i_callback(struct rcu_head *head)
|
|
{
|
|
struct inode *inode = container_of(head, struct inode, i_rcu);
|
|
kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode));
|
|
}
|
|
|
|
void btrfs_destroy_inode(struct inode *inode)
|
|
{
|
|
struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
|
|
struct btrfs_ordered_extent *ordered;
|
|
struct btrfs_root *root = BTRFS_I(inode)->root;
|
|
|
|
WARN_ON(!hlist_empty(&inode->i_dentry));
|
|
WARN_ON(inode->i_data.nrpages);
|
|
WARN_ON(BTRFS_I(inode)->outstanding_extents);
|
|
WARN_ON(BTRFS_I(inode)->reserved_extents);
|
|
WARN_ON(BTRFS_I(inode)->delalloc_bytes);
|
|
WARN_ON(BTRFS_I(inode)->csum_bytes);
|
|
WARN_ON(BTRFS_I(inode)->defrag_bytes);
|
|
|
|
/*
|
|
* This can happen where we create an inode, but somebody else also
|
|
* created the same inode and we need to destroy the one we already
|
|
* created.
|
|
*/
|
|
if (!root)
|
|
goto free;
|
|
|
|
if (test_bit(BTRFS_INODE_HAS_ORPHAN_ITEM,
|
|
&BTRFS_I(inode)->runtime_flags)) {
|
|
btrfs_info(fs_info, "inode %llu still on the orphan list",
|
|
btrfs_ino(BTRFS_I(inode)));
|
|
atomic_dec(&root->orphan_inodes);
|
|
}
|
|
|
|
while (1) {
|
|
ordered = btrfs_lookup_first_ordered_extent(inode, (u64)-1);
|
|
if (!ordered)
|
|
break;
|
|
else {
|
|
btrfs_err(fs_info,
|
|
"found ordered extent %llu %llu on inode cleanup",
|
|
ordered->file_offset, ordered->len);
|
|
btrfs_remove_ordered_extent(inode, ordered);
|
|
btrfs_put_ordered_extent(ordered);
|
|
btrfs_put_ordered_extent(ordered);
|
|
}
|
|
}
|
|
btrfs_qgroup_check_reserved_leak(inode);
|
|
inode_tree_del(inode);
|
|
btrfs_drop_extent_cache(BTRFS_I(inode), 0, (u64)-1, 0);
|
|
free:
|
|
call_rcu(&inode->i_rcu, btrfs_i_callback);
|
|
}
|
|
|
|
int btrfs_drop_inode(struct inode *inode)
|
|
{
|
|
struct btrfs_root *root = BTRFS_I(inode)->root;
|
|
|
|
if (root == NULL)
|
|
return 1;
|
|
|
|
/* the snap/subvol tree is on deleting */
|
|
if (btrfs_root_refs(&root->root_item) == 0)
|
|
return 1;
|
|
else
|
|
return generic_drop_inode(inode);
|
|
}
|
|
|
|
static void init_once(void *foo)
|
|
{
|
|
struct btrfs_inode *ei = (struct btrfs_inode *) foo;
|
|
|
|
inode_init_once(&ei->vfs_inode);
|
|
}
|
|
|
|
void btrfs_destroy_cachep(void)
|
|
{
|
|
/*
|
|
* Make sure all delayed rcu free inodes are flushed before we
|
|
* destroy cache.
|
|
*/
|
|
rcu_barrier();
|
|
kmem_cache_destroy(btrfs_inode_cachep);
|
|
kmem_cache_destroy(btrfs_trans_handle_cachep);
|
|
kmem_cache_destroy(btrfs_transaction_cachep);
|
|
kmem_cache_destroy(btrfs_path_cachep);
|
|
kmem_cache_destroy(btrfs_free_space_cachep);
|
|
}
|
|
|
|
int btrfs_init_cachep(void)
|
|
{
|
|
btrfs_inode_cachep = kmem_cache_create("btrfs_inode",
|
|
sizeof(struct btrfs_inode), 0,
|
|
SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD | SLAB_ACCOUNT,
|
|
init_once);
|
|
if (!btrfs_inode_cachep)
|
|
goto fail;
|
|
|
|
btrfs_trans_handle_cachep = kmem_cache_create("btrfs_trans_handle",
|
|
sizeof(struct btrfs_trans_handle), 0,
|
|
SLAB_TEMPORARY | SLAB_MEM_SPREAD, NULL);
|
|
if (!btrfs_trans_handle_cachep)
|
|
goto fail;
|
|
|
|
btrfs_transaction_cachep = kmem_cache_create("btrfs_transaction",
|
|
sizeof(struct btrfs_transaction), 0,
|
|
SLAB_TEMPORARY | SLAB_MEM_SPREAD, NULL);
|
|
if (!btrfs_transaction_cachep)
|
|
goto fail;
|
|
|
|
btrfs_path_cachep = kmem_cache_create("btrfs_path",
|
|
sizeof(struct btrfs_path), 0,
|
|
SLAB_MEM_SPREAD, NULL);
|
|
if (!btrfs_path_cachep)
|
|
goto fail;
|
|
|
|
btrfs_free_space_cachep = kmem_cache_create("btrfs_free_space",
|
|
sizeof(struct btrfs_free_space), 0,
|
|
SLAB_MEM_SPREAD, NULL);
|
|
if (!btrfs_free_space_cachep)
|
|
goto fail;
|
|
|
|
return 0;
|
|
fail:
|
|
btrfs_destroy_cachep();
|
|
return -ENOMEM;
|
|
}
|
|
|
|
static int btrfs_getattr(struct vfsmount *mnt,
|
|
struct dentry *dentry, struct kstat *stat)
|
|
{
|
|
u64 delalloc_bytes;
|
|
struct inode *inode = d_inode(dentry);
|
|
u32 blocksize = inode->i_sb->s_blocksize;
|
|
|
|
generic_fillattr(inode, stat);
|
|
stat->dev = BTRFS_I(inode)->root->anon_dev;
|
|
|
|
spin_lock(&BTRFS_I(inode)->lock);
|
|
delalloc_bytes = BTRFS_I(inode)->delalloc_bytes;
|
|
spin_unlock(&BTRFS_I(inode)->lock);
|
|
stat->blocks = (ALIGN(inode_get_bytes(inode), blocksize) +
|
|
ALIGN(delalloc_bytes, blocksize)) >> 9;
|
|
return 0;
|
|
}
|
|
|
|
static int btrfs_rename_exchange(struct inode *old_dir,
|
|
struct dentry *old_dentry,
|
|
struct inode *new_dir,
|
|
struct dentry *new_dentry)
|
|
{
|
|
struct btrfs_fs_info *fs_info = btrfs_sb(old_dir->i_sb);
|
|
struct btrfs_trans_handle *trans;
|
|
struct btrfs_root *root = BTRFS_I(old_dir)->root;
|
|
struct btrfs_root *dest = BTRFS_I(new_dir)->root;
|
|
struct inode *new_inode = new_dentry->d_inode;
|
|
struct inode *old_inode = old_dentry->d_inode;
|
|
struct timespec ctime = current_time(old_inode);
|
|
struct dentry *parent;
|
|
u64 old_ino = btrfs_ino(BTRFS_I(old_inode));
|
|
u64 new_ino = btrfs_ino(BTRFS_I(new_inode));
|
|
u64 old_idx = 0;
|
|
u64 new_idx = 0;
|
|
u64 root_objectid;
|
|
int ret;
|
|
bool root_log_pinned = false;
|
|
bool dest_log_pinned = false;
|
|
|
|
/* we only allow rename subvolume link between subvolumes */
|
|
if (old_ino != BTRFS_FIRST_FREE_OBJECTID && root != dest)
|
|
return -EXDEV;
|
|
|
|
/* close the race window with snapshot create/destroy ioctl */
|
|
if (old_ino == BTRFS_FIRST_FREE_OBJECTID)
|
|
down_read(&fs_info->subvol_sem);
|
|
if (new_ino == BTRFS_FIRST_FREE_OBJECTID)
|
|
down_read(&fs_info->subvol_sem);
|
|
|
|
/*
|
|
* We want to reserve the absolute worst case amount of items. So if
|
|
* both inodes are subvols and we need to unlink them then that would
|
|
* require 4 item modifications, but if they are both normal inodes it
|
|
* would require 5 item modifications, so we'll assume their normal
|
|
* inodes. So 5 * 2 is 10, plus 2 for the new links, so 12 total items
|
|
* should cover the worst case number of items we'll modify.
|
|
*/
|
|
trans = btrfs_start_transaction(root, 12);
|
|
if (IS_ERR(trans)) {
|
|
ret = PTR_ERR(trans);
|
|
goto out_notrans;
|
|
}
|
|
|
|
/*
|
|
* We need to find a free sequence number both in the source and
|
|
* in the destination directory for the exchange.
|
|
*/
|
|
ret = btrfs_set_inode_index(BTRFS_I(new_dir), &old_idx);
|
|
if (ret)
|
|
goto out_fail;
|
|
ret = btrfs_set_inode_index(BTRFS_I(old_dir), &new_idx);
|
|
if (ret)
|
|
goto out_fail;
|
|
|
|
BTRFS_I(old_inode)->dir_index = 0ULL;
|
|
BTRFS_I(new_inode)->dir_index = 0ULL;
|
|
|
|
/* Reference for the source. */
|
|
if (old_ino == BTRFS_FIRST_FREE_OBJECTID) {
|
|
/* force full log commit if subvolume involved. */
|
|
btrfs_set_log_full_commit(fs_info, trans);
|
|
} else {
|
|
btrfs_pin_log_trans(root);
|
|
root_log_pinned = true;
|
|
ret = btrfs_insert_inode_ref(trans, dest,
|
|
new_dentry->d_name.name,
|
|
new_dentry->d_name.len,
|
|
old_ino,
|
|
btrfs_ino(BTRFS_I(new_dir)),
|
|
old_idx);
|
|
if (ret)
|
|
goto out_fail;
|
|
}
|
|
|
|
/* And now for the dest. */
|
|
if (new_ino == BTRFS_FIRST_FREE_OBJECTID) {
|
|
/* force full log commit if subvolume involved. */
|
|
btrfs_set_log_full_commit(fs_info, trans);
|
|
} else {
|
|
btrfs_pin_log_trans(dest);
|
|
dest_log_pinned = true;
|
|
ret = btrfs_insert_inode_ref(trans, root,
|
|
old_dentry->d_name.name,
|
|
old_dentry->d_name.len,
|
|
new_ino,
|
|
btrfs_ino(BTRFS_I(old_dir)),
|
|
new_idx);
|
|
if (ret)
|
|
goto out_fail;
|
|
}
|
|
|
|
/* Update inode version and ctime/mtime. */
|
|
inode_inc_iversion(old_dir);
|
|
inode_inc_iversion(new_dir);
|
|
inode_inc_iversion(old_inode);
|
|
inode_inc_iversion(new_inode);
|
|
old_dir->i_ctime = old_dir->i_mtime = ctime;
|
|
new_dir->i_ctime = new_dir->i_mtime = ctime;
|
|
old_inode->i_ctime = ctime;
|
|
new_inode->i_ctime = ctime;
|
|
|
|
if (old_dentry->d_parent != new_dentry->d_parent) {
|
|
btrfs_record_unlink_dir(trans, BTRFS_I(old_dir),
|
|
BTRFS_I(old_inode), 1);
|
|
btrfs_record_unlink_dir(trans, BTRFS_I(new_dir),
|
|
BTRFS_I(new_inode), 1);
|
|
}
|
|
|
|
/* src is a subvolume */
|
|
if (old_ino == BTRFS_FIRST_FREE_OBJECTID) {
|
|
root_objectid = BTRFS_I(old_inode)->root->root_key.objectid;
|
|
ret = btrfs_unlink_subvol(trans, root, old_dir,
|
|
root_objectid,
|
|
old_dentry->d_name.name,
|
|
old_dentry->d_name.len);
|
|
} else { /* src is an inode */
|
|
ret = __btrfs_unlink_inode(trans, root, BTRFS_I(old_dir),
|
|
BTRFS_I(old_dentry->d_inode),
|
|
old_dentry->d_name.name,
|
|
old_dentry->d_name.len);
|
|
if (!ret)
|
|
ret = btrfs_update_inode(trans, root, old_inode);
|
|
}
|
|
if (ret) {
|
|
btrfs_abort_transaction(trans, ret);
|
|
goto out_fail;
|
|
}
|
|
|
|
/* dest is a subvolume */
|
|
if (new_ino == BTRFS_FIRST_FREE_OBJECTID) {
|
|
root_objectid = BTRFS_I(new_inode)->root->root_key.objectid;
|
|
ret = btrfs_unlink_subvol(trans, dest, new_dir,
|
|
root_objectid,
|
|
new_dentry->d_name.name,
|
|
new_dentry->d_name.len);
|
|
} else { /* dest is an inode */
|
|
ret = __btrfs_unlink_inode(trans, dest, BTRFS_I(new_dir),
|
|
BTRFS_I(new_dentry->d_inode),
|
|
new_dentry->d_name.name,
|
|
new_dentry->d_name.len);
|
|
if (!ret)
|
|
ret = btrfs_update_inode(trans, dest, new_inode);
|
|
}
|
|
if (ret) {
|
|
btrfs_abort_transaction(trans, ret);
|
|
goto out_fail;
|
|
}
|
|
|
|
ret = btrfs_add_link(trans, new_dir, old_inode,
|
|
new_dentry->d_name.name,
|
|
new_dentry->d_name.len, 0, old_idx);
|
|
if (ret) {
|
|
btrfs_abort_transaction(trans, ret);
|
|
goto out_fail;
|
|
}
|
|
|
|
ret = btrfs_add_link(trans, old_dir, new_inode,
|
|
old_dentry->d_name.name,
|
|
old_dentry->d_name.len, 0, new_idx);
|
|
if (ret) {
|
|
btrfs_abort_transaction(trans, ret);
|
|
goto out_fail;
|
|
}
|
|
|
|
if (old_inode->i_nlink == 1)
|
|
BTRFS_I(old_inode)->dir_index = old_idx;
|
|
if (new_inode->i_nlink == 1)
|
|
BTRFS_I(new_inode)->dir_index = new_idx;
|
|
|
|
if (root_log_pinned) {
|
|
parent = new_dentry->d_parent;
|
|
btrfs_log_new_name(trans, BTRFS_I(old_inode), BTRFS_I(old_dir),
|
|
parent);
|
|
btrfs_end_log_trans(root);
|
|
root_log_pinned = false;
|
|
}
|
|
if (dest_log_pinned) {
|
|
parent = old_dentry->d_parent;
|
|
btrfs_log_new_name(trans, BTRFS_I(new_inode), BTRFS_I(new_dir),
|
|
parent);
|
|
btrfs_end_log_trans(dest);
|
|
dest_log_pinned = false;
|
|
}
|
|
out_fail:
|
|
/*
|
|
* If we have pinned a log and an error happened, we unpin tasks
|
|
* trying to sync the log and force them to fallback to a transaction
|
|
* commit if the log currently contains any of the inodes involved in
|
|
* this rename operation (to ensure we do not persist a log with an
|
|
* inconsistent state for any of these inodes or leading to any
|
|
* inconsistencies when replayed). If the transaction was aborted, the
|
|
* abortion reason is propagated to userspace when attempting to commit
|
|
* the transaction. If the log does not contain any of these inodes, we
|
|
* allow the tasks to sync it.
|
|
*/
|
|
if (ret && (root_log_pinned || dest_log_pinned)) {
|
|
if (btrfs_inode_in_log(BTRFS_I(old_dir), fs_info->generation) ||
|
|
btrfs_inode_in_log(BTRFS_I(new_dir), fs_info->generation) ||
|
|
btrfs_inode_in_log(BTRFS_I(old_inode), fs_info->generation) ||
|
|
(new_inode &&
|
|
btrfs_inode_in_log(BTRFS_I(new_inode), fs_info->generation)))
|
|
btrfs_set_log_full_commit(fs_info, trans);
|
|
|
|
if (root_log_pinned) {
|
|
btrfs_end_log_trans(root);
|
|
root_log_pinned = false;
|
|
}
|
|
if (dest_log_pinned) {
|
|
btrfs_end_log_trans(dest);
|
|
dest_log_pinned = false;
|
|
}
|
|
}
|
|
ret = btrfs_end_transaction(trans);
|
|
out_notrans:
|
|
if (new_ino == BTRFS_FIRST_FREE_OBJECTID)
|
|
up_read(&fs_info->subvol_sem);
|
|
if (old_ino == BTRFS_FIRST_FREE_OBJECTID)
|
|
up_read(&fs_info->subvol_sem);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int btrfs_whiteout_for_rename(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root,
|
|
struct inode *dir,
|
|
struct dentry *dentry)
|
|
{
|
|
int ret;
|
|
struct inode *inode;
|
|
u64 objectid;
|
|
u64 index;
|
|
|
|
ret = btrfs_find_free_ino(root, &objectid);
|
|
if (ret)
|
|
return ret;
|
|
|
|
inode = btrfs_new_inode(trans, root, dir,
|
|
dentry->d_name.name,
|
|
dentry->d_name.len,
|
|
btrfs_ino(BTRFS_I(dir)),
|
|
objectid,
|
|
S_IFCHR | WHITEOUT_MODE,
|
|
&index);
|
|
|
|
if (IS_ERR(inode)) {
|
|
ret = PTR_ERR(inode);
|
|
return ret;
|
|
}
|
|
|
|
inode->i_op = &btrfs_special_inode_operations;
|
|
init_special_inode(inode, inode->i_mode,
|
|
WHITEOUT_DEV);
|
|
|
|
ret = btrfs_init_inode_security(trans, inode, dir,
|
|
&dentry->d_name);
|
|
if (ret)
|
|
goto out;
|
|
|
|
ret = btrfs_add_nondir(trans, dir, dentry,
|
|
inode, 0, index);
|
|
if (ret)
|
|
goto out;
|
|
|
|
ret = btrfs_update_inode(trans, root, inode);
|
|
out:
|
|
unlock_new_inode(inode);
|
|
if (ret)
|
|
inode_dec_link_count(inode);
|
|
iput(inode);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int btrfs_rename(struct inode *old_dir, struct dentry *old_dentry,
|
|
struct inode *new_dir, struct dentry *new_dentry,
|
|
unsigned int flags)
|
|
{
|
|
struct btrfs_fs_info *fs_info = btrfs_sb(old_dir->i_sb);
|
|
struct btrfs_trans_handle *trans;
|
|
unsigned int trans_num_items;
|
|
struct btrfs_root *root = BTRFS_I(old_dir)->root;
|
|
struct btrfs_root *dest = BTRFS_I(new_dir)->root;
|
|
struct inode *new_inode = d_inode(new_dentry);
|
|
struct inode *old_inode = d_inode(old_dentry);
|
|
u64 index = 0;
|
|
u64 root_objectid;
|
|
int ret;
|
|
u64 old_ino = btrfs_ino(BTRFS_I(old_inode));
|
|
bool log_pinned = false;
|
|
|
|
if (btrfs_ino(BTRFS_I(new_dir)) == BTRFS_EMPTY_SUBVOL_DIR_OBJECTID)
|
|
return -EPERM;
|
|
|
|
/* we only allow rename subvolume link between subvolumes */
|
|
if (old_ino != BTRFS_FIRST_FREE_OBJECTID && root != dest)
|
|
return -EXDEV;
|
|
|
|
if (old_ino == BTRFS_EMPTY_SUBVOL_DIR_OBJECTID ||
|
|
(new_inode && btrfs_ino(BTRFS_I(new_inode)) == BTRFS_FIRST_FREE_OBJECTID))
|
|
return -ENOTEMPTY;
|
|
|
|
if (S_ISDIR(old_inode->i_mode) && new_inode &&
|
|
new_inode->i_size > BTRFS_EMPTY_DIR_SIZE)
|
|
return -ENOTEMPTY;
|
|
|
|
|
|
/* check for collisions, even if the name isn't there */
|
|
ret = btrfs_check_dir_item_collision(dest, new_dir->i_ino,
|
|
new_dentry->d_name.name,
|
|
new_dentry->d_name.len);
|
|
|
|
if (ret) {
|
|
if (ret == -EEXIST) {
|
|
/* we shouldn't get
|
|
* eexist without a new_inode */
|
|
if (WARN_ON(!new_inode)) {
|
|
return ret;
|
|
}
|
|
} else {
|
|
/* maybe -EOVERFLOW */
|
|
return ret;
|
|
}
|
|
}
|
|
ret = 0;
|
|
|
|
/*
|
|
* we're using rename to replace one file with another. Start IO on it
|
|
* now so we don't add too much work to the end of the transaction
|
|
*/
|
|
if (new_inode && S_ISREG(old_inode->i_mode) && new_inode->i_size)
|
|
filemap_flush(old_inode->i_mapping);
|
|
|
|
/* close the racy window with snapshot create/destroy ioctl */
|
|
if (old_ino == BTRFS_FIRST_FREE_OBJECTID)
|
|
down_read(&fs_info->subvol_sem);
|
|
/*
|
|
* We want to reserve the absolute worst case amount of items. So if
|
|
* both inodes are subvols and we need to unlink them then that would
|
|
* require 4 item modifications, but if they are both normal inodes it
|
|
* would require 5 item modifications, so we'll assume they are normal
|
|
* inodes. So 5 * 2 is 10, plus 1 for the new link, so 11 total items
|
|
* should cover the worst case number of items we'll modify.
|
|
* If our rename has the whiteout flag, we need more 5 units for the
|
|
* new inode (1 inode item, 1 inode ref, 2 dir items and 1 xattr item
|
|
* when selinux is enabled).
|
|
*/
|
|
trans_num_items = 11;
|
|
if (flags & RENAME_WHITEOUT)
|
|
trans_num_items += 5;
|
|
trans = btrfs_start_transaction(root, trans_num_items);
|
|
if (IS_ERR(trans)) {
|
|
ret = PTR_ERR(trans);
|
|
goto out_notrans;
|
|
}
|
|
|
|
if (dest != root)
|
|
btrfs_record_root_in_trans(trans, dest);
|
|
|
|
ret = btrfs_set_inode_index(BTRFS_I(new_dir), &index);
|
|
if (ret)
|
|
goto out_fail;
|
|
|
|
BTRFS_I(old_inode)->dir_index = 0ULL;
|
|
if (unlikely(old_ino == BTRFS_FIRST_FREE_OBJECTID)) {
|
|
/* force full log commit if subvolume involved. */
|
|
btrfs_set_log_full_commit(fs_info, trans);
|
|
} else {
|
|
btrfs_pin_log_trans(root);
|
|
log_pinned = true;
|
|
ret = btrfs_insert_inode_ref(trans, dest,
|
|
new_dentry->d_name.name,
|
|
new_dentry->d_name.len,
|
|
old_ino,
|
|
btrfs_ino(BTRFS_I(new_dir)), index);
|
|
if (ret)
|
|
goto out_fail;
|
|
}
|
|
|
|
inode_inc_iversion(old_dir);
|
|
inode_inc_iversion(new_dir);
|
|
inode_inc_iversion(old_inode);
|
|
old_dir->i_ctime = old_dir->i_mtime =
|
|
new_dir->i_ctime = new_dir->i_mtime =
|
|
old_inode->i_ctime = current_time(old_dir);
|
|
|
|
if (old_dentry->d_parent != new_dentry->d_parent)
|
|
btrfs_record_unlink_dir(trans, BTRFS_I(old_dir),
|
|
BTRFS_I(old_inode), 1);
|
|
|
|
if (unlikely(old_ino == BTRFS_FIRST_FREE_OBJECTID)) {
|
|
root_objectid = BTRFS_I(old_inode)->root->root_key.objectid;
|
|
ret = btrfs_unlink_subvol(trans, root, old_dir, root_objectid,
|
|
old_dentry->d_name.name,
|
|
old_dentry->d_name.len);
|
|
} else {
|
|
ret = __btrfs_unlink_inode(trans, root, BTRFS_I(old_dir),
|
|
BTRFS_I(d_inode(old_dentry)),
|
|
old_dentry->d_name.name,
|
|
old_dentry->d_name.len);
|
|
if (!ret)
|
|
ret = btrfs_update_inode(trans, root, old_inode);
|
|
}
|
|
if (ret) {
|
|
btrfs_abort_transaction(trans, ret);
|
|
goto out_fail;
|
|
}
|
|
|
|
if (new_inode) {
|
|
inode_inc_iversion(new_inode);
|
|
new_inode->i_ctime = current_time(new_inode);
|
|
if (unlikely(btrfs_ino(BTRFS_I(new_inode)) ==
|
|
BTRFS_EMPTY_SUBVOL_DIR_OBJECTID)) {
|
|
root_objectid = BTRFS_I(new_inode)->location.objectid;
|
|
ret = btrfs_unlink_subvol(trans, dest, new_dir,
|
|
root_objectid,
|
|
new_dentry->d_name.name,
|
|
new_dentry->d_name.len);
|
|
BUG_ON(new_inode->i_nlink == 0);
|
|
} else {
|
|
ret = btrfs_unlink_inode(trans, dest, BTRFS_I(new_dir),
|
|
BTRFS_I(d_inode(new_dentry)),
|
|
new_dentry->d_name.name,
|
|
new_dentry->d_name.len);
|
|
}
|
|
if (!ret && new_inode->i_nlink == 0)
|
|
ret = btrfs_orphan_add(trans, d_inode(new_dentry));
|
|
if (ret) {
|
|
btrfs_abort_transaction(trans, ret);
|
|
goto out_fail;
|
|
}
|
|
}
|
|
|
|
ret = btrfs_add_link(trans, new_dir, old_inode,
|
|
new_dentry->d_name.name,
|
|
new_dentry->d_name.len, 0, index);
|
|
if (ret) {
|
|
btrfs_abort_transaction(trans, ret);
|
|
goto out_fail;
|
|
}
|
|
|
|
if (old_inode->i_nlink == 1)
|
|
BTRFS_I(old_inode)->dir_index = index;
|
|
|
|
if (log_pinned) {
|
|
struct dentry *parent = new_dentry->d_parent;
|
|
|
|
btrfs_log_new_name(trans, BTRFS_I(old_inode), BTRFS_I(old_dir),
|
|
parent);
|
|
btrfs_end_log_trans(root);
|
|
log_pinned = false;
|
|
}
|
|
|
|
if (flags & RENAME_WHITEOUT) {
|
|
ret = btrfs_whiteout_for_rename(trans, root, old_dir,
|
|
old_dentry);
|
|
|
|
if (ret) {
|
|
btrfs_abort_transaction(trans, ret);
|
|
goto out_fail;
|
|
}
|
|
}
|
|
out_fail:
|
|
/*
|
|
* If we have pinned the log and an error happened, we unpin tasks
|
|
* trying to sync the log and force them to fallback to a transaction
|
|
* commit if the log currently contains any of the inodes involved in
|
|
* this rename operation (to ensure we do not persist a log with an
|
|
* inconsistent state for any of these inodes or leading to any
|
|
* inconsistencies when replayed). If the transaction was aborted, the
|
|
* abortion reason is propagated to userspace when attempting to commit
|
|
* the transaction. If the log does not contain any of these inodes, we
|
|
* allow the tasks to sync it.
|
|
*/
|
|
if (ret && log_pinned) {
|
|
if (btrfs_inode_in_log(BTRFS_I(old_dir), fs_info->generation) ||
|
|
btrfs_inode_in_log(BTRFS_I(new_dir), fs_info->generation) ||
|
|
btrfs_inode_in_log(BTRFS_I(old_inode), fs_info->generation) ||
|
|
(new_inode &&
|
|
btrfs_inode_in_log(BTRFS_I(new_inode), fs_info->generation)))
|
|
btrfs_set_log_full_commit(fs_info, trans);
|
|
|
|
btrfs_end_log_trans(root);
|
|
log_pinned = false;
|
|
}
|
|
btrfs_end_transaction(trans);
|
|
out_notrans:
|
|
if (old_ino == BTRFS_FIRST_FREE_OBJECTID)
|
|
up_read(&fs_info->subvol_sem);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int btrfs_rename2(struct inode *old_dir, struct dentry *old_dentry,
|
|
struct inode *new_dir, struct dentry *new_dentry,
|
|
unsigned int flags)
|
|
{
|
|
if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
|
|
return -EINVAL;
|
|
|
|
if (flags & RENAME_EXCHANGE)
|
|
return btrfs_rename_exchange(old_dir, old_dentry, new_dir,
|
|
new_dentry);
|
|
|
|
return btrfs_rename(old_dir, old_dentry, new_dir, new_dentry, flags);
|
|
}
|
|
|
|
static void btrfs_run_delalloc_work(struct btrfs_work *work)
|
|
{
|
|
struct btrfs_delalloc_work *delalloc_work;
|
|
struct inode *inode;
|
|
|
|
delalloc_work = container_of(work, struct btrfs_delalloc_work,
|
|
work);
|
|
inode = delalloc_work->inode;
|
|
filemap_flush(inode->i_mapping);
|
|
if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT,
|
|
&BTRFS_I(inode)->runtime_flags))
|
|
filemap_flush(inode->i_mapping);
|
|
|
|
if (delalloc_work->delay_iput)
|
|
btrfs_add_delayed_iput(inode);
|
|
else
|
|
iput(inode);
|
|
complete(&delalloc_work->completion);
|
|
}
|
|
|
|
struct btrfs_delalloc_work *btrfs_alloc_delalloc_work(struct inode *inode,
|
|
int delay_iput)
|
|
{
|
|
struct btrfs_delalloc_work *work;
|
|
|
|
work = kmalloc(sizeof(*work), GFP_NOFS);
|
|
if (!work)
|
|
return NULL;
|
|
|
|
init_completion(&work->completion);
|
|
INIT_LIST_HEAD(&work->list);
|
|
work->inode = inode;
|
|
work->delay_iput = delay_iput;
|
|
WARN_ON_ONCE(!inode);
|
|
btrfs_init_work(&work->work, btrfs_flush_delalloc_helper,
|
|
btrfs_run_delalloc_work, NULL, NULL);
|
|
|
|
return work;
|
|
}
|
|
|
|
void btrfs_wait_and_free_delalloc_work(struct btrfs_delalloc_work *work)
|
|
{
|
|
wait_for_completion(&work->completion);
|
|
kfree(work);
|
|
}
|
|
|
|
/*
|
|
* some fairly slow code that needs optimization. This walks the list
|
|
* of all the inodes with pending delalloc and forces them to disk.
|
|
*/
|
|
static int __start_delalloc_inodes(struct btrfs_root *root, int delay_iput,
|
|
int nr)
|
|
{
|
|
struct btrfs_inode *binode;
|
|
struct inode *inode;
|
|
struct btrfs_delalloc_work *work, *next;
|
|
struct list_head works;
|
|
struct list_head splice;
|
|
int ret = 0;
|
|
|
|
INIT_LIST_HEAD(&works);
|
|
INIT_LIST_HEAD(&splice);
|
|
|
|
mutex_lock(&root->delalloc_mutex);
|
|
spin_lock(&root->delalloc_lock);
|
|
list_splice_init(&root->delalloc_inodes, &splice);
|
|
while (!list_empty(&splice)) {
|
|
binode = list_entry(splice.next, struct btrfs_inode,
|
|
delalloc_inodes);
|
|
|
|
list_move_tail(&binode->delalloc_inodes,
|
|
&root->delalloc_inodes);
|
|
inode = igrab(&binode->vfs_inode);
|
|
if (!inode) {
|
|
cond_resched_lock(&root->delalloc_lock);
|
|
continue;
|
|
}
|
|
spin_unlock(&root->delalloc_lock);
|
|
|
|
work = btrfs_alloc_delalloc_work(inode, delay_iput);
|
|
if (!work) {
|
|
if (delay_iput)
|
|
btrfs_add_delayed_iput(inode);
|
|
else
|
|
iput(inode);
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
list_add_tail(&work->list, &works);
|
|
btrfs_queue_work(root->fs_info->flush_workers,
|
|
&work->work);
|
|
ret++;
|
|
if (nr != -1 && ret >= nr)
|
|
goto out;
|
|
cond_resched();
|
|
spin_lock(&root->delalloc_lock);
|
|
}
|
|
spin_unlock(&root->delalloc_lock);
|
|
|
|
out:
|
|
list_for_each_entry_safe(work, next, &works, list) {
|
|
list_del_init(&work->list);
|
|
btrfs_wait_and_free_delalloc_work(work);
|
|
}
|
|
|
|
if (!list_empty_careful(&splice)) {
|
|
spin_lock(&root->delalloc_lock);
|
|
list_splice_tail(&splice, &root->delalloc_inodes);
|
|
spin_unlock(&root->delalloc_lock);
|
|
}
|
|
mutex_unlock(&root->delalloc_mutex);
|
|
return ret;
|
|
}
|
|
|
|
int btrfs_start_delalloc_inodes(struct btrfs_root *root, int delay_iput)
|
|
{
|
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
|
int ret;
|
|
|
|
if (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state))
|
|
return -EROFS;
|
|
|
|
ret = __start_delalloc_inodes(root, delay_iput, -1);
|
|
if (ret > 0)
|
|
ret = 0;
|
|
/*
|
|
* the filemap_flush will queue IO into the worker threads, but
|
|
* we have to make sure the IO is actually started and that
|
|
* ordered extents get created before we return
|
|
*/
|
|
atomic_inc(&fs_info->async_submit_draining);
|
|
while (atomic_read(&fs_info->nr_async_submits) ||
|
|
atomic_read(&fs_info->async_delalloc_pages)) {
|
|
wait_event(fs_info->async_submit_wait,
|
|
(atomic_read(&fs_info->nr_async_submits) == 0 &&
|
|
atomic_read(&fs_info->async_delalloc_pages) == 0));
|
|
}
|
|
atomic_dec(&fs_info->async_submit_draining);
|
|
return ret;
|
|
}
|
|
|
|
int btrfs_start_delalloc_roots(struct btrfs_fs_info *fs_info, int delay_iput,
|
|
int nr)
|
|
{
|
|
struct btrfs_root *root;
|
|
struct list_head splice;
|
|
int ret;
|
|
|
|
if (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state))
|
|
return -EROFS;
|
|
|
|
INIT_LIST_HEAD(&splice);
|
|
|
|
mutex_lock(&fs_info->delalloc_root_mutex);
|
|
spin_lock(&fs_info->delalloc_root_lock);
|
|
list_splice_init(&fs_info->delalloc_roots, &splice);
|
|
while (!list_empty(&splice) && nr) {
|
|
root = list_first_entry(&splice, struct btrfs_root,
|
|
delalloc_root);
|
|
root = btrfs_grab_fs_root(root);
|
|
BUG_ON(!root);
|
|
list_move_tail(&root->delalloc_root,
|
|
&fs_info->delalloc_roots);
|
|
spin_unlock(&fs_info->delalloc_root_lock);
|
|
|
|
ret = __start_delalloc_inodes(root, delay_iput, nr);
|
|
btrfs_put_fs_root(root);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
if (nr != -1) {
|
|
nr -= ret;
|
|
WARN_ON(nr < 0);
|
|
}
|
|
spin_lock(&fs_info->delalloc_root_lock);
|
|
}
|
|
spin_unlock(&fs_info->delalloc_root_lock);
|
|
|
|
ret = 0;
|
|
atomic_inc(&fs_info->async_submit_draining);
|
|
while (atomic_read(&fs_info->nr_async_submits) ||
|
|
atomic_read(&fs_info->async_delalloc_pages)) {
|
|
wait_event(fs_info->async_submit_wait,
|
|
(atomic_read(&fs_info->nr_async_submits) == 0 &&
|
|
atomic_read(&fs_info->async_delalloc_pages) == 0));
|
|
}
|
|
atomic_dec(&fs_info->async_submit_draining);
|
|
out:
|
|
if (!list_empty_careful(&splice)) {
|
|
spin_lock(&fs_info->delalloc_root_lock);
|
|
list_splice_tail(&splice, &fs_info->delalloc_roots);
|
|
spin_unlock(&fs_info->delalloc_root_lock);
|
|
}
|
|
mutex_unlock(&fs_info->delalloc_root_mutex);
|
|
return ret;
|
|
}
|
|
|
|
static int btrfs_symlink(struct inode *dir, struct dentry *dentry,
|
|
const char *symname)
|
|
{
|
|
struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb);
|
|
struct btrfs_trans_handle *trans;
|
|
struct btrfs_root *root = BTRFS_I(dir)->root;
|
|
struct btrfs_path *path;
|
|
struct btrfs_key key;
|
|
struct inode *inode = NULL;
|
|
int err;
|
|
int drop_inode = 0;
|
|
u64 objectid;
|
|
u64 index = 0;
|
|
int name_len;
|
|
int datasize;
|
|
unsigned long ptr;
|
|
struct btrfs_file_extent_item *ei;
|
|
struct extent_buffer *leaf;
|
|
|
|
name_len = strlen(symname);
|
|
if (name_len > BTRFS_MAX_INLINE_DATA_SIZE(fs_info))
|
|
return -ENAMETOOLONG;
|
|
|
|
/*
|
|
* 2 items for inode item and ref
|
|
* 2 items for dir items
|
|
* 1 item for updating parent inode item
|
|
* 1 item for the inline extent item
|
|
* 1 item for xattr if selinux is on
|
|
*/
|
|
trans = btrfs_start_transaction(root, 7);
|
|
if (IS_ERR(trans))
|
|
return PTR_ERR(trans);
|
|
|
|
err = btrfs_find_free_ino(root, &objectid);
|
|
if (err)
|
|
goto out_unlock;
|
|
|
|
inode = btrfs_new_inode(trans, root, dir, dentry->d_name.name,
|
|
dentry->d_name.len, btrfs_ino(BTRFS_I(dir)),
|
|
objectid, S_IFLNK|S_IRWXUGO, &index);
|
|
if (IS_ERR(inode)) {
|
|
err = PTR_ERR(inode);
|
|
goto out_unlock;
|
|
}
|
|
|
|
/*
|
|
* If the active LSM wants to access the inode during
|
|
* d_instantiate it needs these. Smack checks to see
|
|
* if the filesystem supports xattrs by looking at the
|
|
* ops vector.
|
|
*/
|
|
inode->i_fop = &btrfs_file_operations;
|
|
inode->i_op = &btrfs_file_inode_operations;
|
|
inode->i_mapping->a_ops = &btrfs_aops;
|
|
BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops;
|
|
|
|
err = btrfs_init_inode_security(trans, inode, dir, &dentry->d_name);
|
|
if (err)
|
|
goto out_unlock_inode;
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path) {
|
|
err = -ENOMEM;
|
|
goto out_unlock_inode;
|
|
}
|
|
key.objectid = btrfs_ino(BTRFS_I(inode));
|
|
key.offset = 0;
|
|
key.type = BTRFS_EXTENT_DATA_KEY;
|
|
datasize = btrfs_file_extent_calc_inline_size(name_len);
|
|
err = btrfs_insert_empty_item(trans, root, path, &key,
|
|
datasize);
|
|
if (err) {
|
|
btrfs_free_path(path);
|
|
goto out_unlock_inode;
|
|
}
|
|
leaf = path->nodes[0];
|
|
ei = btrfs_item_ptr(leaf, path->slots[0],
|
|
struct btrfs_file_extent_item);
|
|
btrfs_set_file_extent_generation(leaf, ei, trans->transid);
|
|
btrfs_set_file_extent_type(leaf, ei,
|
|
BTRFS_FILE_EXTENT_INLINE);
|
|
btrfs_set_file_extent_encryption(leaf, ei, 0);
|
|
btrfs_set_file_extent_compression(leaf, ei, 0);
|
|
btrfs_set_file_extent_other_encoding(leaf, ei, 0);
|
|
btrfs_set_file_extent_ram_bytes(leaf, ei, name_len);
|
|
|
|
ptr = btrfs_file_extent_inline_start(ei);
|
|
write_extent_buffer(leaf, symname, ptr, name_len);
|
|
btrfs_mark_buffer_dirty(leaf);
|
|
btrfs_free_path(path);
|
|
|
|
inode->i_op = &btrfs_symlink_inode_operations;
|
|
inode_nohighmem(inode);
|
|
inode->i_mapping->a_ops = &btrfs_symlink_aops;
|
|
inode_set_bytes(inode, name_len);
|
|
btrfs_i_size_write(BTRFS_I(inode), name_len);
|
|
err = btrfs_update_inode(trans, root, inode);
|
|
/*
|
|
* Last step, add directory indexes for our symlink inode. This is the
|
|
* last step to avoid extra cleanup of these indexes if an error happens
|
|
* elsewhere above.
|
|
*/
|
|
if (!err)
|
|
err = btrfs_add_nondir(trans, dir, dentry, inode, 0, index);
|
|
if (err) {
|
|
drop_inode = 1;
|
|
goto out_unlock_inode;
|
|
}
|
|
|
|
unlock_new_inode(inode);
|
|
d_instantiate(dentry, inode);
|
|
|
|
out_unlock:
|
|
btrfs_end_transaction(trans);
|
|
if (drop_inode) {
|
|
inode_dec_link_count(inode);
|
|
iput(inode);
|
|
}
|
|
btrfs_btree_balance_dirty(fs_info);
|
|
return err;
|
|
|
|
out_unlock_inode:
|
|
drop_inode = 1;
|
|
unlock_new_inode(inode);
|
|
goto out_unlock;
|
|
}
|
|
|
|
static int __btrfs_prealloc_file_range(struct inode *inode, int mode,
|
|
u64 start, u64 num_bytes, u64 min_size,
|
|
loff_t actual_len, u64 *alloc_hint,
|
|
struct btrfs_trans_handle *trans)
|
|
{
|
|
struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
|
|
struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
|
|
struct extent_map *em;
|
|
struct btrfs_root *root = BTRFS_I(inode)->root;
|
|
struct btrfs_key ins;
|
|
u64 cur_offset = start;
|
|
u64 i_size;
|
|
u64 cur_bytes;
|
|
u64 last_alloc = (u64)-1;
|
|
int ret = 0;
|
|
bool own_trans = true;
|
|
u64 end = start + num_bytes - 1;
|
|
|
|
if (trans)
|
|
own_trans = false;
|
|
while (num_bytes > 0) {
|
|
if (own_trans) {
|
|
trans = btrfs_start_transaction(root, 3);
|
|
if (IS_ERR(trans)) {
|
|
ret = PTR_ERR(trans);
|
|
break;
|
|
}
|
|
}
|
|
|
|
cur_bytes = min_t(u64, num_bytes, SZ_256M);
|
|
cur_bytes = max(cur_bytes, min_size);
|
|
/*
|
|
* If we are severely fragmented we could end up with really
|
|
* small allocations, so if the allocator is returning small
|
|
* chunks lets make its job easier by only searching for those
|
|
* sized chunks.
|
|
*/
|
|
cur_bytes = min(cur_bytes, last_alloc);
|
|
ret = btrfs_reserve_extent(root, cur_bytes, cur_bytes,
|
|
min_size, 0, *alloc_hint, &ins, 1, 0);
|
|
if (ret) {
|
|
if (own_trans)
|
|
btrfs_end_transaction(trans);
|
|
break;
|
|
}
|
|
btrfs_dec_block_group_reservations(fs_info, ins.objectid);
|
|
|
|
last_alloc = ins.offset;
|
|
ret = insert_reserved_file_extent(trans, inode,
|
|
cur_offset, ins.objectid,
|
|
ins.offset, ins.offset,
|
|
ins.offset, 0, 0, 0,
|
|
BTRFS_FILE_EXTENT_PREALLOC);
|
|
if (ret) {
|
|
btrfs_free_reserved_extent(fs_info, ins.objectid,
|
|
ins.offset, 0);
|
|
btrfs_abort_transaction(trans, ret);
|
|
if (own_trans)
|
|
btrfs_end_transaction(trans);
|
|
break;
|
|
}
|
|
|
|
btrfs_drop_extent_cache(BTRFS_I(inode), cur_offset,
|
|
cur_offset + ins.offset -1, 0);
|
|
|
|
em = alloc_extent_map();
|
|
if (!em) {
|
|
set_bit(BTRFS_INODE_NEEDS_FULL_SYNC,
|
|
&BTRFS_I(inode)->runtime_flags);
|
|
goto next;
|
|
}
|
|
|
|
em->start = cur_offset;
|
|
em->orig_start = cur_offset;
|
|
em->len = ins.offset;
|
|
em->block_start = ins.objectid;
|
|
em->block_len = ins.offset;
|
|
em->orig_block_len = ins.offset;
|
|
em->ram_bytes = ins.offset;
|
|
em->bdev = fs_info->fs_devices->latest_bdev;
|
|
set_bit(EXTENT_FLAG_PREALLOC, &em->flags);
|
|
em->generation = trans->transid;
|
|
|
|
while (1) {
|
|
write_lock(&em_tree->lock);
|
|
ret = add_extent_mapping(em_tree, em, 1);
|
|
write_unlock(&em_tree->lock);
|
|
if (ret != -EEXIST)
|
|
break;
|
|
btrfs_drop_extent_cache(BTRFS_I(inode), cur_offset,
|
|
cur_offset + ins.offset - 1,
|
|
0);
|
|
}
|
|
free_extent_map(em);
|
|
next:
|
|
num_bytes -= ins.offset;
|
|
cur_offset += ins.offset;
|
|
*alloc_hint = ins.objectid + ins.offset;
|
|
|
|
inode_inc_iversion(inode);
|
|
inode->i_ctime = current_time(inode);
|
|
BTRFS_I(inode)->flags |= BTRFS_INODE_PREALLOC;
|
|
if (!(mode & FALLOC_FL_KEEP_SIZE) &&
|
|
(actual_len > inode->i_size) &&
|
|
(cur_offset > inode->i_size)) {
|
|
if (cur_offset > actual_len)
|
|
i_size = actual_len;
|
|
else
|
|
i_size = cur_offset;
|
|
i_size_write(inode, i_size);
|
|
btrfs_ordered_update_i_size(inode, i_size, NULL);
|
|
}
|
|
|
|
ret = btrfs_update_inode(trans, root, inode);
|
|
|
|
if (ret) {
|
|
btrfs_abort_transaction(trans, ret);
|
|
if (own_trans)
|
|
btrfs_end_transaction(trans);
|
|
break;
|
|
}
|
|
|
|
if (own_trans)
|
|
btrfs_end_transaction(trans);
|
|
}
|
|
if (cur_offset < end)
|
|
btrfs_free_reserved_data_space(inode, cur_offset,
|
|
end - cur_offset + 1);
|
|
return ret;
|
|
}
|
|
|
|
int btrfs_prealloc_file_range(struct inode *inode, int mode,
|
|
u64 start, u64 num_bytes, u64 min_size,
|
|
loff_t actual_len, u64 *alloc_hint)
|
|
{
|
|
return __btrfs_prealloc_file_range(inode, mode, start, num_bytes,
|
|
min_size, actual_len, alloc_hint,
|
|
NULL);
|
|
}
|
|
|
|
int btrfs_prealloc_file_range_trans(struct inode *inode,
|
|
struct btrfs_trans_handle *trans, int mode,
|
|
u64 start, u64 num_bytes, u64 min_size,
|
|
loff_t actual_len, u64 *alloc_hint)
|
|
{
|
|
return __btrfs_prealloc_file_range(inode, mode, start, num_bytes,
|
|
min_size, actual_len, alloc_hint, trans);
|
|
}
|
|
|
|
static int btrfs_set_page_dirty(struct page *page)
|
|
{
|
|
return __set_page_dirty_nobuffers(page);
|
|
}
|
|
|
|
static int btrfs_permission(struct inode *inode, int mask)
|
|
{
|
|
struct btrfs_root *root = BTRFS_I(inode)->root;
|
|
umode_t mode = inode->i_mode;
|
|
|
|
if (mask & MAY_WRITE &&
|
|
(S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode))) {
|
|
if (btrfs_root_readonly(root))
|
|
return -EROFS;
|
|
if (BTRFS_I(inode)->flags & BTRFS_INODE_READONLY)
|
|
return -EACCES;
|
|
}
|
|
return generic_permission(inode, mask);
|
|
}
|
|
|
|
static int btrfs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
|
|
{
|
|
struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb);
|
|
struct btrfs_trans_handle *trans;
|
|
struct btrfs_root *root = BTRFS_I(dir)->root;
|
|
struct inode *inode = NULL;
|
|
u64 objectid;
|
|
u64 index;
|
|
int ret = 0;
|
|
|
|
/*
|
|
* 5 units required for adding orphan entry
|
|
*/
|
|
trans = btrfs_start_transaction(root, 5);
|
|
if (IS_ERR(trans))
|
|
return PTR_ERR(trans);
|
|
|
|
ret = btrfs_find_free_ino(root, &objectid);
|
|
if (ret)
|
|
goto out;
|
|
|
|
inode = btrfs_new_inode(trans, root, dir, NULL, 0,
|
|
btrfs_ino(BTRFS_I(dir)), objectid, mode, &index);
|
|
if (IS_ERR(inode)) {
|
|
ret = PTR_ERR(inode);
|
|
inode = NULL;
|
|
goto out;
|
|
}
|
|
|
|
inode->i_fop = &btrfs_file_operations;
|
|
inode->i_op = &btrfs_file_inode_operations;
|
|
|
|
inode->i_mapping->a_ops = &btrfs_aops;
|
|
BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops;
|
|
|
|
ret = btrfs_init_inode_security(trans, inode, dir, NULL);
|
|
if (ret)
|
|
goto out_inode;
|
|
|
|
ret = btrfs_update_inode(trans, root, inode);
|
|
if (ret)
|
|
goto out_inode;
|
|
ret = btrfs_orphan_add(trans, inode);
|
|
if (ret)
|
|
goto out_inode;
|
|
|
|
/*
|
|
* We set number of links to 0 in btrfs_new_inode(), and here we set
|
|
* it to 1 because d_tmpfile() will issue a warning if the count is 0,
|
|
* through:
|
|
*
|
|
* d_tmpfile() -> inode_dec_link_count() -> drop_nlink()
|
|
*/
|
|
set_nlink(inode, 1);
|
|
unlock_new_inode(inode);
|
|
d_tmpfile(dentry, inode);
|
|
mark_inode_dirty(inode);
|
|
|
|
out:
|
|
btrfs_end_transaction(trans);
|
|
if (ret)
|
|
iput(inode);
|
|
btrfs_balance_delayed_items(fs_info);
|
|
btrfs_btree_balance_dirty(fs_info);
|
|
return ret;
|
|
|
|
out_inode:
|
|
unlock_new_inode(inode);
|
|
goto out;
|
|
|
|
}
|
|
|
|
static const struct inode_operations btrfs_dir_inode_operations = {
|
|
.getattr = btrfs_getattr,
|
|
.lookup = btrfs_lookup,
|
|
.create = btrfs_create,
|
|
.unlink = btrfs_unlink,
|
|
.link = btrfs_link,
|
|
.mkdir = btrfs_mkdir,
|
|
.rmdir = btrfs_rmdir,
|
|
.rename = btrfs_rename2,
|
|
.symlink = btrfs_symlink,
|
|
.setattr = btrfs_setattr,
|
|
.mknod = btrfs_mknod,
|
|
.listxattr = btrfs_listxattr,
|
|
.permission = btrfs_permission,
|
|
.get_acl = btrfs_get_acl,
|
|
.set_acl = btrfs_set_acl,
|
|
.update_time = btrfs_update_time,
|
|
.tmpfile = btrfs_tmpfile,
|
|
};
|
|
static const struct inode_operations btrfs_dir_ro_inode_operations = {
|
|
.lookup = btrfs_lookup,
|
|
.permission = btrfs_permission,
|
|
.update_time = btrfs_update_time,
|
|
};
|
|
|
|
static const struct file_operations btrfs_dir_file_operations = {
|
|
.llseek = generic_file_llseek,
|
|
.read = generic_read_dir,
|
|
.iterate_shared = btrfs_real_readdir,
|
|
.unlocked_ioctl = btrfs_ioctl,
|
|
#ifdef CONFIG_COMPAT
|
|
.compat_ioctl = btrfs_compat_ioctl,
|
|
#endif
|
|
.release = btrfs_release_file,
|
|
.fsync = btrfs_sync_file,
|
|
};
|
|
|
|
static const struct extent_io_ops btrfs_extent_io_ops = {
|
|
.fill_delalloc = run_delalloc_range,
|
|
.submit_bio_hook = btrfs_submit_bio_hook,
|
|
.merge_bio_hook = btrfs_merge_bio_hook,
|
|
.readpage_end_io_hook = btrfs_readpage_end_io_hook,
|
|
.writepage_end_io_hook = btrfs_writepage_end_io_hook,
|
|
.writepage_start_hook = btrfs_writepage_start_hook,
|
|
.set_bit_hook = btrfs_set_bit_hook,
|
|
.clear_bit_hook = btrfs_clear_bit_hook,
|
|
.merge_extent_hook = btrfs_merge_extent_hook,
|
|
.split_extent_hook = btrfs_split_extent_hook,
|
|
};
|
|
|
|
/*
|
|
* btrfs doesn't support the bmap operation because swapfiles
|
|
* use bmap to make a mapping of extents in the file. They assume
|
|
* these extents won't change over the life of the file and they
|
|
* use the bmap result to do IO directly to the drive.
|
|
*
|
|
* the btrfs bmap call would return logical addresses that aren't
|
|
* suitable for IO and they also will change frequently as COW
|
|
* operations happen. So, swapfile + btrfs == corruption.
|
|
*
|
|
* For now we're avoiding this by dropping bmap.
|
|
*/
|
|
static const struct address_space_operations btrfs_aops = {
|
|
.readpage = btrfs_readpage,
|
|
.writepage = btrfs_writepage,
|
|
.writepages = btrfs_writepages,
|
|
.readpages = btrfs_readpages,
|
|
.direct_IO = btrfs_direct_IO,
|
|
.invalidatepage = btrfs_invalidatepage,
|
|
.releasepage = btrfs_releasepage,
|
|
.set_page_dirty = btrfs_set_page_dirty,
|
|
.error_remove_page = generic_error_remove_page,
|
|
};
|
|
|
|
static const struct address_space_operations btrfs_symlink_aops = {
|
|
.readpage = btrfs_readpage,
|
|
.writepage = btrfs_writepage,
|
|
.invalidatepage = btrfs_invalidatepage,
|
|
.releasepage = btrfs_releasepage,
|
|
};
|
|
|
|
static const struct inode_operations btrfs_file_inode_operations = {
|
|
.getattr = btrfs_getattr,
|
|
.setattr = btrfs_setattr,
|
|
.listxattr = btrfs_listxattr,
|
|
.permission = btrfs_permission,
|
|
.fiemap = btrfs_fiemap,
|
|
.get_acl = btrfs_get_acl,
|
|
.set_acl = btrfs_set_acl,
|
|
.update_time = btrfs_update_time,
|
|
};
|
|
static const struct inode_operations btrfs_special_inode_operations = {
|
|
.getattr = btrfs_getattr,
|
|
.setattr = btrfs_setattr,
|
|
.permission = btrfs_permission,
|
|
.listxattr = btrfs_listxattr,
|
|
.get_acl = btrfs_get_acl,
|
|
.set_acl = btrfs_set_acl,
|
|
.update_time = btrfs_update_time,
|
|
};
|
|
static const struct inode_operations btrfs_symlink_inode_operations = {
|
|
.get_link = page_get_link,
|
|
.getattr = btrfs_getattr,
|
|
.setattr = btrfs_setattr,
|
|
.permission = btrfs_permission,
|
|
.listxattr = btrfs_listxattr,
|
|
.update_time = btrfs_update_time,
|
|
};
|
|
|
|
const struct dentry_operations btrfs_dentry_operations = {
|
|
.d_delete = btrfs_dentry_delete,
|
|
.d_release = btrfs_dentry_release,
|
|
};
|