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Merge git://git.kernel.org/pub/scm/linux/kernel/git/mason/btrfs-unstable

Browse Source 
* git://git.kernel.org/pub/scm/linux/kernel/git/mason/btrfs-unstable: (30 commits)
  Btrfs: fix the inode ref searches done by btrfs_search_path_in_tree
  Btrfs: allow treeid==0 in the inode lookup ioctl
  Btrfs: return keys for large items to the search ioctl
  Btrfs: fix key checks and advance in the search ioctl
  Btrfs: buffer results in the space_info ioctl
  Btrfs: use __u64 types in ioctl.h
  Btrfs: fix search_ioctl key advance
  Btrfs: fix gfp flags masking in the compression code
  Btrfs: don't look at bio flags after submit_bio
  btrfs: using btrfs_stack_device_id() get devid
  btrfs: use memparse
  Btrfs: add a "df" ioctl for btrfs
  Btrfs: cache the extent state everywhere we possibly can V2
  Btrfs: cache ordered extent when completing io
  Btrfs: cache extent state in find_delalloc_range
  Btrfs: change the ordered tree to use a spinlock instead of a mutex
  Btrfs: finish read pages in the order they are submitted
  btrfs: fix btrfs_mkdir goto for no free objectids
  Btrfs: flush data on snapshot creation
  Btrfs: make df be a little bit more understandable
  ...
This commit is contained in:
Linus Torvalds 2010-03-18 16:50:55 -07:00
commit 441f4058a0
19 changed files with 1226 additions and 230 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
fs/btrfs/btrfs_inode.h
View File

@ -153,6 +153,11 @@ struct btrfs_inode {
unsigned ordered_data_close:1;
unsigned dummy_inode:1;
/*
* always compress this one file
*/
unsigned force_compress:1;
struct inode vfs_inode;
};

2
fs/btrfs/compression.c
View File

@ -478,7 +478,7 @@ static noinline int add_ra_bio_pages(struct inode *inode,
goto next;
}
page = alloc_page(mapping_gfp_mask(mapping) | GFP_NOFS);
page = alloc_page(mapping_gfp_mask(mapping) & ~__GFP_FS);
if (!page)
break;

13
fs/btrfs/ctree.h
View File

@ -373,11 +373,13 @@ struct btrfs_super_block {
* ones specified below then we will fail to mount
*/
#define BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF (1ULL << 0)
#define BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL (2ULL << 0)
#define BTRFS_FEATURE_COMPAT_SUPP 0ULL
#define BTRFS_FEATURE_COMPAT_RO_SUPP 0ULL
#define BTRFS_FEATURE_INCOMPAT_SUPP \
BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF
(BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF | \
BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL)
/*
* A leaf is full of items. offset and size tell us where to find
@ -1182,7 +1184,6 @@ struct btrfs_root {
#define BTRFS_INODE_NOATIME (1 << 9)
#define BTRFS_INODE_DIRSYNC (1 << 10)
/* some macros to generate set/get funcs for the struct fields. This
* assumes there is a lefoo_to_cpu for every type, so lets make a simple
* one for u8:
@ -1842,7 +1843,7 @@ BTRFS_SETGET_STACK_FUNCS(super_num_devices, struct btrfs_super_block,
BTRFS_SETGET_STACK_FUNCS(super_compat_flags, struct btrfs_super_block,
compat_flags, 64);
BTRFS_SETGET_STACK_FUNCS(super_compat_ro_flags, struct btrfs_super_block,
compat_flags, 64);
compat_ro_flags, 64);
BTRFS_SETGET_STACK_FUNCS(super_incompat_flags, struct btrfs_super_block,
incompat_flags, 64);
BTRFS_SETGET_STACK_FUNCS(super_csum_type, struct btrfs_super_block,
@ -2310,7 +2311,8 @@ int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans,
u32 min_type);
int btrfs_start_delalloc_inodes(struct btrfs_root *root, int delay_iput);
int btrfs_set_extent_delalloc(struct inode *inode, u64 start, u64 end);
int btrfs_set_extent_delalloc(struct inode *inode, u64 start, u64 end,
struct extent_state **cached_state);
int btrfs_writepages(struct address_space *mapping,
struct writeback_control *wbc);
int btrfs_create_subvol_root(struct btrfs_trans_handle *trans,
@ -2335,7 +2337,7 @@ int btrfs_init_cachep(void);
void btrfs_destroy_cachep(void);
long btrfs_ioctl_trans_end(struct file *file);
struct inode *btrfs_iget(struct super_block *s, struct btrfs_key *location,
struct btrfs_root *root);
struct btrfs_root *root, int *was_new);
int btrfs_commit_write(struct file *file, struct page *page,
unsigned from, unsigned to);
struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
@ -2386,7 +2388,6 @@ void btrfs_sysfs_del_super(struct btrfs_fs_info *root);
ssize_t btrfs_listxattr(struct dentry *dentry, char *buffer, size_t size);
/* super.c */
u64 btrfs_parse_size(char *str);
int btrfs_parse_options(struct btrfs_root *root, char *options);
int btrfs_sync_fs(struct super_block *sb, int wait);

15
fs/btrfs/disk-io.c
View File

@ -263,13 +263,15 @@ static int csum_tree_block(struct btrfs_root *root, struct extent_buffer *buf,
static int verify_parent_transid(struct extent_io_tree *io_tree,
struct extent_buffer *eb, u64 parent_transid)
{
struct extent_state *cached_state = NULL;
int ret;
if (!parent_transid || btrfs_header_generation(eb) == parent_transid)
return 0;
lock_extent(io_tree, eb->start, eb->start + eb->len - 1, GFP_NOFS);
if (extent_buffer_uptodate(io_tree, eb) &&
lock_extent_bits(io_tree, eb->start, eb->start + eb->len - 1,
0, &cached_state, GFP_NOFS);
if (extent_buffer_uptodate(io_tree, eb, cached_state) &&
btrfs_header_generation(eb) == parent_transid) {
ret = 0;
goto out;
@ -282,10 +284,10 @@ static int verify_parent_transid(struct extent_io_tree *io_tree,
(unsigned long long)btrfs_header_generation(eb));
}
ret = 1;
clear_extent_buffer_uptodate(io_tree, eb);
clear_extent_buffer_uptodate(io_tree, eb, &cached_state);
out:
unlock_extent(io_tree, eb->start, eb->start + eb->len - 1,
GFP_NOFS);
unlock_extent_cached(io_tree, eb->start, eb->start + eb->len - 1,
&cached_state, GFP_NOFS);
return ret;
}
@ -2497,7 +2499,8 @@ int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid)
int ret;
struct inode *btree_inode = buf->first_page->mapping->host;
ret = extent_buffer_uptodate(&BTRFS_I(btree_inode)->io_tree, buf);
ret = extent_buffer_uptodate(&BTRFS_I(btree_inode)->io_tree, buf,
NULL);
if (!ret)
return ret;

4
fs/btrfs/export.c
View File

@ -95,7 +95,7 @@ static struct dentry *btrfs_get_dentry(struct super_block *sb, u64 objectid,
btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY);
key.offset = 0;
inode = btrfs_iget(sb, &key, root);
inode = btrfs_iget(sb, &key, root, NULL);
if (IS_ERR(inode)) {
err = PTR_ERR(inode);
goto fail;
@ -223,7 +223,7 @@ static struct dentry *btrfs_get_parent(struct dentry *child)
key.type = BTRFS_INODE_ITEM_KEY;
key.offset = 0;
dentry = d_obtain_alias(btrfs_iget(root->fs_info->sb, &key, root));
dentry = d_obtain_alias(btrfs_iget(root->fs_info->sb, &key, root, NULL));
if (!IS_ERR(dentry))
dentry->d_op = &btrfs_dentry_operations;
return dentry;

11
fs/btrfs/extent-tree.c
View File

@ -6561,6 +6561,7 @@ static noinline int invalidate_extent_cache(struct btrfs_root *root,
struct btrfs_key key;
struct inode *inode = NULL;
struct btrfs_file_extent_item *fi;
struct extent_state *cached_state = NULL;
u64 num_bytes;
u64 skip_objectid = 0;
u32 nritems;
@ -6589,12 +6590,14 @@ static noinline int invalidate_extent_cache(struct btrfs_root *root,
}
num_bytes = btrfs_file_extent_num_bytes(leaf, fi);
lock_extent(&BTRFS_I(inode)->io_tree, key.offset,
key.offset + num_bytes - 1, GFP_NOFS);
lock_extent_bits(&BTRFS_I(inode)->io_tree, key.offset,
key.offset + num_bytes - 1, 0, &cached_state,
GFP_NOFS);
btrfs_drop_extent_cache(inode, key.offset,
key.offset + num_bytes - 1, 1);
unlock_extent(&BTRFS_I(inode)->io_tree, key.offset,
key.offset + num_bytes - 1, GFP_NOFS);
unlock_extent_cached(&BTRFS_I(inode)->io_tree, key.offset,
key.offset + num_bytes - 1, &cached_state,
GFP_NOFS);
cond_resched();
}
iput(inode);

79
fs/btrfs/extent_io.c
View File

@ -513,7 +513,10 @@ int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
u64 last_end;
int err;
int set = 0;
int clear = 0;
if (bits & (EXTENT_IOBITS | EXTENT_BOUNDARY))
clear = 1;
again:
if (!prealloc && (mask & __GFP_WAIT)) {
prealloc = alloc_extent_state(mask);
@ -524,14 +527,20 @@ again:
spin_lock(&tree->lock);
if (cached_state) {
cached = *cached_state;
*cached_state = NULL;
cached_state = NULL;
if (clear) {
*cached_state = NULL;
cached_state = NULL;
}
if (cached && cached->tree && cached->start == start) {
atomic_dec(&cached->refs);
if (clear)
atomic_dec(&cached->refs);
state = cached;
goto hit_next;
}
free_extent_state(cached);
if (clear)
free_extent_state(cached);
}
/*
* this search will find the extents that end after
@ -946,11 +955,11 @@ int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
}
int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
gfp_t mask)
struct extent_state **cached_state, gfp_t mask)
{
return set_extent_bit(tree, start, end,
EXTENT_DELALLOC | EXTENT_DIRTY | EXTENT_UPTODATE,
0, NULL, NULL, mask);
0, NULL, cached_state, mask);
}
int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
@ -984,10 +993,11 @@ int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
}
static int clear_extent_uptodate(struct extent_io_tree *tree, u64 start,
u64 end, gfp_t mask)
u64 end, struct extent_state **cached_state,
gfp_t mask)
{
return clear_extent_bit(tree, start, end, EXTENT_UPTODATE, 0, 0,
NULL, mask);
cached_state, mask);
}
int wait_on_extent_writeback(struct extent_io_tree *tree, u64 start, u64 end)
@ -1171,7 +1181,8 @@ out:
* 1 is returned if we find something, 0 if nothing was in the tree
*/
static noinline u64 find_delalloc_range(struct extent_io_tree *tree,
u64 *start, u64 *end, u64 max_bytes)
u64 *start, u64 *end, u64 max_bytes,
struct extent_state **cached_state)
{
struct rb_node *node;
struct extent_state *state;
@ -1203,8 +1214,11 @@ static noinline u64 find_delalloc_range(struct extent_io_tree *tree,
*end = state->end;
goto out;
}
if (!found)
if (!found) {
*start = state->start;
*cached_state = state;
atomic_inc(&state->refs);
}
found++;
*end = state->end;
cur_start = state->end + 1;
@ -1336,10 +1350,11 @@ again:
delalloc_start = *start;
delalloc_end = 0;
found = find_delalloc_range(tree, &delalloc_start, &delalloc_end,
max_bytes);
max_bytes, &cached_state);
if (!found || delalloc_end <= *start) {
*start = delalloc_start;
*end = delalloc_end;
free_extent_state(cached_state);
return found;
}
@ -1722,7 +1737,7 @@ static void end_bio_extent_writepage(struct bio *bio, int err)
}
if (!uptodate) {
clear_extent_uptodate(tree, start, end, GFP_NOFS);
clear_extent_uptodate(tree, start, end, NULL, GFP_NOFS);
ClearPageUptodate(page);
SetPageError(page);
}
@ -1750,7 +1765,8 @@ static void end_bio_extent_writepage(struct bio *bio, int err)
static void end_bio_extent_readpage(struct bio *bio, int err)
{
int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1;
struct bio_vec *bvec_end = bio->bi_io_vec + bio->bi_vcnt - 1;
struct bio_vec *bvec = bio->bi_io_vec;
struct extent_io_tree *tree;
u64 start;
u64 end;
@ -1773,7 +1789,7 @@ static void end_bio_extent_readpage(struct bio *bio, int err)
else
whole_page = 0;
if (--bvec >= bio->bi_io_vec)
if (++bvec <= bvec_end)
prefetchw(&bvec->bv_page->flags);
if (uptodate && tree->ops && tree->ops->readpage_end_io_hook) {
@ -1818,7 +1834,7 @@ static void end_bio_extent_readpage(struct bio *bio, int err)
}
check_page_locked(tree, page);
}
} while (bvec >= bio->bi_io_vec);
} while (bvec <= bvec_end);
bio_put(bio);
}
@ -2704,6 +2720,7 @@ int extent_readpages(struct extent_io_tree *tree,
int extent_invalidatepage(struct extent_io_tree *tree,
struct page *page, unsigned long offset)
{
struct extent_state *cached_state = NULL;
u64 start = ((u64)page->index << PAGE_CACHE_SHIFT);
u64 end = start + PAGE_CACHE_SIZE - 1;
size_t blocksize = page->mapping->host->i_sb->s_blocksize;
@ -2712,12 +2729,12 @@ int extent_invalidatepage(struct extent_io_tree *tree,
if (start > end)
return 0;
lock_extent(tree, start, end, GFP_NOFS);
lock_extent_bits(tree, start, end, 0, &cached_state, GFP_NOFS);
wait_on_page_writeback(page);
clear_extent_bit(tree, start, end,
EXTENT_LOCKED | EXTENT_DIRTY | EXTENT_DELALLOC |
EXTENT_DO_ACCOUNTING,
1, 1, NULL, GFP_NOFS);
1, 1, &cached_state, GFP_NOFS);
return 0;
}
@ -2920,16 +2937,17 @@ sector_t extent_bmap(struct address_space *mapping, sector_t iblock,
get_extent_t *get_extent)
{
struct inode *inode = mapping->host;
struct extent_state *cached_state = NULL;
u64 start = iblock << inode->i_blkbits;
sector_t sector = 0;
size_t blksize = (1 << inode->i_blkbits);
struct extent_map *em;
lock_extent(&BTRFS_I(inode)->io_tree, start, start + blksize - 1,
GFP_NOFS);
lock_extent_bits(&BTRFS_I(inode)->io_tree, start, start + blksize - 1,
0, &cached_state, GFP_NOFS);
em = get_extent(inode, NULL, 0, start, blksize, 0);
unlock_extent(&BTRFS_I(inode)->io_tree, start, start + blksize - 1,
GFP_NOFS);
unlock_extent_cached(&BTRFS_I(inode)->io_tree, start,
start + blksize - 1, &cached_state, GFP_NOFS);
if (!em || IS_ERR(em))
return 0;
@ -2951,6 +2969,7 @@ int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
u32 flags = 0;
u64 disko = 0;
struct extent_map *em = NULL;
struct extent_state *cached_state = NULL;
int end = 0;
u64 em_start = 0, em_len = 0;
unsigned long emflags;
@ -2959,8 +2978,8 @@ int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
if (len == 0)
return -EINVAL;
lock_extent(&BTRFS_I(inode)->io_tree, start, start + len,
GFP_NOFS);
lock_extent_bits(&BTRFS_I(inode)->io_tree, start, start + len, 0,
&cached_state, GFP_NOFS);
em = get_extent(inode, NULL, 0, off, max - off, 0);
if (!em)
goto out;
@ -3023,8 +3042,8 @@ int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
out_free:
free_extent_map(em);
out:
unlock_extent(&BTRFS_I(inode)->io_tree, start, start + len,
GFP_NOFS);
unlock_extent_cached(&BTRFS_I(inode)->io_tree, start, start + len,
&cached_state, GFP_NOFS);
return ret;
}
@ -3264,7 +3283,8 @@ int set_extent_buffer_dirty(struct extent_io_tree *tree,
}
int clear_extent_buffer_uptodate(struct extent_io_tree *tree,
struct extent_buffer *eb)
struct extent_buffer *eb,
struct extent_state **cached_state)
{
unsigned long i;
struct page *page;
@ -3274,7 +3294,7 @@ int clear_extent_buffer_uptodate(struct extent_io_tree *tree,
clear_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags);
clear_extent_uptodate(tree, eb->start, eb->start + eb->len - 1,
GFP_NOFS);
cached_state, GFP_NOFS);
for (i = 0; i < num_pages; i++) {
page = extent_buffer_page(eb, i);
if (page)
@ -3334,7 +3354,8 @@ int extent_range_uptodate(struct extent_io_tree *tree,
}
int extent_buffer_uptodate(struct extent_io_tree *tree,
struct extent_buffer *eb)
struct extent_buffer *eb,
struct extent_state *cached_state)
{
int ret = 0;
unsigned long num_pages;
@ -3346,7 +3367,7 @@ int extent_buffer_uptodate(struct extent_io_tree *tree,
return 1;
ret = test_range_bit(tree, eb->start, eb->start + eb->len - 1,
EXTENT_UPTODATE, 1, NULL);
EXTENT_UPTODATE, 1, cached_state);
if (ret)
return ret;

10
fs/btrfs/extent_io.h
View File

@ -163,6 +163,8 @@ int lock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
int bits, struct extent_state **cached, gfp_t mask);
int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
int unlock_extent_cached(struct extent_io_tree *tree, u64 start, u64 end,
struct extent_state **cached, gfp_t mask);
int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end,
gfp_t mask);
int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
@ -196,7 +198,7 @@ int clear_extent_ordered(struct extent_io_tree *tree, u64 start, u64 end,
int clear_extent_ordered_metadata(struct extent_io_tree *tree, u64 start,
u64 end, gfp_t mask);
int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
gfp_t mask);
struct extent_state **cached_state, gfp_t mask);
int set_extent_ordered(struct extent_io_tree *tree, u64 start, u64 end,
gfp_t mask);
int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
@ -281,9 +283,11 @@ int test_extent_buffer_dirty(struct extent_io_tree *tree,
int set_extent_buffer_uptodate(struct extent_io_tree *tree,
struct extent_buffer *eb);
int clear_extent_buffer_uptodate(struct extent_io_tree *tree,
struct extent_buffer *eb);
struct extent_buffer *eb,
struct extent_state **cached_state);
int extent_buffer_uptodate(struct extent_io_tree *tree,
struct extent_buffer *eb);
struct extent_buffer *eb,
struct extent_state *cached_state);
int map_extent_buffer(struct extent_buffer *eb, unsigned long offset,
unsigned long min_len, char **token, char **map,
unsigned long *map_start,

23
fs/btrfs/file.c
View File

@ -123,7 +123,8 @@ static noinline int dirty_and_release_pages(struct btrfs_trans_handle *trans,
root->sectorsize - 1) & ~((u64)root->sectorsize - 1);
end_of_last_block = start_pos + num_bytes - 1;
err = btrfs_set_extent_delalloc(inode, start_pos, end_of_last_block);
err = btrfs_set_extent_delalloc(inode, start_pos, end_of_last_block,
NULL);
if (err)
return err;
@ -753,6 +754,7 @@ static noinline int prepare_pages(struct btrfs_root *root, struct file *file,
loff_t pos, unsigned long first_index,
unsigned long last_index, size_t write_bytes)
{
struct extent_state *cached_state = NULL;
int i;
unsigned long index = pos >> PAGE_CACHE_SHIFT;
struct inode *inode = fdentry(file)->d_inode;
@ -781,16 +783,18 @@ again:
}
if (start_pos < inode->i_size) {
struct btrfs_ordered_extent *ordered;
lock_extent(&BTRFS_I(inode)->io_tree,
start_pos, last_pos - 1, GFP_NOFS);
lock_extent_bits(&BTRFS_I(inode)->io_tree,
start_pos, last_pos - 1, 0, &cached_state,
GFP_NOFS);
ordered = btrfs_lookup_first_ordered_extent(inode,
last_pos - 1);
if (ordered &&
ordered->file_offset + ordered->len > start_pos &&
ordered->file_offset < last_pos) {
btrfs_put_ordered_extent(ordered);
unlock_extent(&BTRFS_I(inode)->io_tree,
start_pos, last_pos - 1, GFP_NOFS);
unlock_extent_cached(&BTRFS_I(inode)->io_tree,
start_pos, last_pos - 1,
&cached_state, GFP_NOFS);
for (i = 0; i < num_pages; i++) {
unlock_page(pages[i]);
page_cache_release(pages[i]);
@ -802,12 +806,13 @@ again:
if (ordered)
btrfs_put_ordered_extent(ordered);
clear_extent_bits(&BTRFS_I(inode)->io_tree, start_pos,
clear_extent_bit(&BTRFS_I(inode)->io_tree, start_pos,
last_pos - 1, EXTENT_DIRTY | EXTENT_DELALLOC |
EXTENT_DO_ACCOUNTING,
EXTENT_DO_ACCOUNTING, 0, 0, &cached_state,
GFP_NOFS);
unlock_extent(&BTRFS_I(inode)->io_tree,
start_pos, last_pos - 1, GFP_NOFS);
unlock_extent_cached(&BTRFS_I(inode)->io_tree,
start_pos, last_pos - 1, &cached_state,
GFP_NOFS);
}
for (i = 0; i < num_pages; i++) {
clear_page_dirty_for_io(pages[i]);

139
fs/btrfs/inode.c
View File

@ -379,7 +379,8 @@ again:
* change at any time if we discover bad compression ratios.
*/
if (!(BTRFS_I(inode)->flags & BTRFS_INODE_NOCOMPRESS) &&
btrfs_test_opt(root, COMPRESS)) {
(btrfs_test_opt(root, COMPRESS) ||
(BTRFS_I(inode)->force_compress))) {
WARN_ON(pages);
pages = kzalloc(sizeof(struct page *) * nr_pages, GFP_NOFS);
@ -483,8 +484,10 @@ again:
nr_pages_ret = 0;
/* flag the file so we don't compress in the future */
if (!btrfs_test_opt(root, FORCE_COMPRESS))
if (!btrfs_test_opt(root, FORCE_COMPRESS) &&
!(BTRFS_I(inode)->force_compress)) {
BTRFS_I(inode)->flags |= BTRFS_INODE_NOCOMPRESS;
}
}
if (will_compress) {
*num_added += 1;
@ -570,8 +573,8 @@ retry:
unsigned long nr_written = 0;
lock_extent(io_tree, async_extent->start,
async_extent->start +
async_extent->ram_size - 1, GFP_NOFS);
async_extent->start +
async_extent->ram_size - 1, GFP_NOFS);
/* allocate blocks */
ret = cow_file_range(inode, async_cow->locked_page,
@ -1211,7 +1214,8 @@ static int run_delalloc_range(struct inode *inode, struct page *locked_page,
else if (BTRFS_I(inode)->flags & BTRFS_INODE_PREALLOC)
ret = run_delalloc_nocow(inode, locked_page, start, end,
page_started, 0, nr_written);
else if (!btrfs_test_opt(root, COMPRESS))
else if (!btrfs_test_opt(root, COMPRESS) &&
!(BTRFS_I(inode)->force_compress))
ret = cow_file_range(inode, locked_page, start, end,
page_started, nr_written, 1);
else
@ -1508,12 +1512,13 @@ static noinline int add_pending_csums(struct btrfs_trans_handle *trans,
return 0;
}
int btrfs_set_extent_delalloc(struct inode *inode, u64 start, u64 end)
int btrfs_set_extent_delalloc(struct inode *inode, u64 start, u64 end,
struct extent_state **cached_state)
{
if ((end & (PAGE_CACHE_SIZE - 1)) == 0)
WARN_ON(1);
return set_extent_delalloc(&BTRFS_I(inode)->io_tree, start, end,
GFP_NOFS);
cached_state, GFP_NOFS);
}
/* see btrfs_writepage_start_hook for details on why this is required */
@ -1526,6 +1531,7 @@ 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;
@ -1544,7 +1550,8 @@ again:
page_start = page_offset(page);
page_end = page_offset(page) + PAGE_CACHE_SIZE - 1;
lock_extent(&BTRFS_I(inode)->io_tree, page_start, page_end, GFP_NOFS);
lock_extent_bits(&BTRFS_I(inode)->io_tree, page_start, page_end, 0,
&cached_state, GFP_NOFS);
/* already ordered? We're done */
if (PagePrivate2(page))
@ -1552,17 +1559,18 @@ again:
ordered = btrfs_lookup_ordered_extent(inode, page_start);
if (ordered) {
unlock_extent(&BTRFS_I(inode)->io_tree, page_start,
page_end, GFP_NOFS);
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);
goto again;
}
btrfs_set_extent_delalloc(inode, page_start, page_end);
btrfs_set_extent_delalloc(inode, page_start, page_end, &cached_state);
ClearPageChecked(page);
out:
unlock_extent(&BTRFS_I(inode)->io_tree, page_start, page_end, GFP_NOFS);
unlock_extent_cached(&BTRFS_I(inode)->io_tree, page_start, page_end,
&cached_state, GFP_NOFS);
out_page:
unlock_page(page);
page_cache_release(page);
@ -1691,14 +1699,14 @@ static int btrfs_finish_ordered_io(struct inode *inode, u64 start, u64 end)
struct btrfs_trans_handle *trans;
struct btrfs_ordered_extent *ordered_extent = NULL;
struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
struct extent_state *cached_state = NULL;
int compressed = 0;
int ret;
ret = btrfs_dec_test_ordered_pending(inode, start, end - start + 1);
ret = btrfs_dec_test_ordered_pending(inode, &ordered_extent, start,
end - start + 1);
if (!ret)
return 0;
ordered_extent = btrfs_lookup_ordered_extent(inode, start);
BUG_ON(!ordered_extent);
if (test_bit(BTRFS_ORDERED_NOCOW, &ordered_extent->flags)) {
@ -1713,9 +1721,9 @@ static int btrfs_finish_ordered_io(struct inode *inode, u64 start, u64 end)
goto out;
}
lock_extent(io_tree, ordered_extent->file_offset,
ordered_extent->file_offset + ordered_extent->len - 1,
GFP_NOFS);
lock_extent_bits(io_tree, ordered_extent->file_offset,
ordered_extent->file_offset + ordered_extent->len - 1,
0, &cached_state, GFP_NOFS);
trans = btrfs_join_transaction(root, 1);
@ -1742,9 +1750,10 @@ static int btrfs_finish_ordered_io(struct inode *inode, u64 start, u64 end)
ordered_extent->len);
BUG_ON(ret);
}
unlock_extent(io_tree, ordered_extent->file_offset,
ordered_extent->file_offset + ordered_extent->len - 1,
GFP_NOFS);
unlock_extent_cached(io_tree, ordered_extent->file_offset,
ordered_extent->file_offset +
ordered_extent->len - 1, &cached_state, GFP_NOFS);
add_pending_csums(trans, inode, ordered_extent->file_offset,
&ordered_extent->list);
@ -2153,7 +2162,7 @@ void btrfs_orphan_cleanup(struct btrfs_root *root)
found_key.objectid = found_key.offset;
found_key.type = BTRFS_INODE_ITEM_KEY;
found_key.offset = 0;
inode = btrfs_iget(root->fs_info->sb, &found_key, root);
inode = btrfs_iget(root->fs_info->sb, &found_key, root, NULL);
if (IS_ERR(inode))
break;
@ -3081,6 +3090,7 @@ static int btrfs_truncate_page(struct address_space *mapping, loff_t from)
struct btrfs_root *root = BTRFS_I(inode)->root;
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 = root->sectorsize;
pgoff_t index = from >> PAGE_CACHE_SHIFT;
@ -3127,12 +3137,14 @@ again:
}
wait_on_page_writeback(page);
lock_extent(io_tree, page_start, page_end, GFP_NOFS);
lock_extent_bits(io_tree, page_start, page_end, 0, &cached_state,
GFP_NOFS);
set_page_extent_mapped(page);
ordered = btrfs_lookup_ordered_extent(inode, page_start);
if (ordered) {
unlock_extent(io_tree, page_start, page_end, GFP_NOFS);
unlock_extent_cached(io_tree, page_start, page_end,
&cached_state, GFP_NOFS);
unlock_page(page);
page_cache_release(page);
btrfs_start_ordered_extent(inode, ordered, 1);
@ -3140,13 +3152,15 @@ again:
goto again;
}
clear_extent_bits(&BTRFS_I(inode)->io_tree, page_start, page_end,
clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start, page_end,
EXTENT_DIRTY | EXTENT_DELALLOC | EXTENT_DO_ACCOUNTING,
GFP_NOFS);
0, 0, &cached_state, GFP_NOFS);
ret = btrfs_set_extent_delalloc(inode, page_start, page_end);
ret = btrfs_set_extent_delalloc(inode, page_start, page_end,
&cached_state);
if (ret) {
unlock_extent(io_tree, page_start, page_end, GFP_NOFS);
unlock_extent_cached(io_tree, page_start, page_end,
&cached_state, GFP_NOFS);
goto out_unlock;
}
@ -3159,7 +3173,8 @@ again:
}
ClearPageChecked(page);
set_page_dirty(page);
unlock_extent(io_tree, page_start, page_end, GFP_NOFS);
unlock_extent_cached(io_tree, page_start, page_end, &cached_state,
GFP_NOFS);
out_unlock:
if (ret)
@ -3177,6 +3192,7 @@ int btrfs_cont_expand(struct inode *inode, loff_t size)
struct btrfs_root *root = BTRFS_I(inode)->root;
struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
struct extent_map *em;
struct extent_state *cached_state = NULL;
u64 mask = root->sectorsize - 1;
u64 hole_start = (inode->i_size + mask) & ~mask;
u64 block_end = (size + mask) & ~mask;
@ -3192,11 +3208,13 @@ int btrfs_cont_expand(struct inode *inode, loff_t size)
struct btrfs_ordered_extent *ordered;
btrfs_wait_ordered_range(inode, hole_start,
block_end - hole_start);
lock_extent(io_tree, hole_start, block_end - 1, GFP_NOFS);
lock_extent_bits(io_tree, hole_start, block_end - 1, 0,
&cached_state, GFP_NOFS);
ordered = btrfs_lookup_ordered_extent(inode, hole_start);
if (!ordered)
break;
unlock_extent(io_tree, hole_start, block_end - 1, GFP_NOFS);
unlock_extent_cached(io_tree, hole_start, block_end - 1,
&cached_state, GFP_NOFS);
btrfs_put_ordered_extent(ordered);
}
@ -3241,7 +3259,8 @@ int btrfs_cont_expand(struct inode *inode, loff_t size)
break;
}
unlock_extent(io_tree, hole_start, block_end - 1, GFP_NOFS);
unlock_extent_cached(io_tree, hole_start, block_end - 1, &cached_state,
GFP_NOFS);
return err;
}
@ -3639,6 +3658,7 @@ static noinline void init_btrfs_i(struct inode *inode)
bi->index_cnt = (u64)-1;
bi->last_unlink_trans = 0;
bi->ordered_data_close = 0;
bi->force_compress = 0;
extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS);
extent_io_tree_init(&BTRFS_I(inode)->io_tree,
inode->i_mapping, GFP_NOFS);
@ -3687,7 +3707,7 @@ static struct inode *btrfs_iget_locked(struct super_block *s,
* 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)
struct btrfs_root *root, int *new)
{
struct inode *inode;
@ -3702,6 +3722,8 @@ struct inode *btrfs_iget(struct super_block *s, struct btrfs_key *location,
inode_tree_add(inode);
unlock_new_inode(inode);
if (new)
*new = 1;
}
return inode;
@ -3754,7 +3776,7 @@ struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry)
return NULL;
if (location.type == BTRFS_INODE_ITEM_KEY) {
inode = btrfs_iget(dir->i_sb, &location, root);
inode = btrfs_iget(dir->i_sb, &location, root, NULL);
return inode;
}
@ -3769,7 +3791,7 @@ struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry)
else
inode = new_simple_dir(dir->i_sb, &location, sub_root);
} else {
inode = btrfs_iget(dir->i_sb, &location, sub_root);
inode = btrfs_iget(dir->i_sb, &location, sub_root, NULL);
}
srcu_read_unlock(&root->fs_info->subvol_srcu, index);
@ -4501,7 +4523,7 @@ static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
if (err) {
err = -ENOSPC;
goto out_unlock;
goto out_fail;
}
inode = btrfs_new_inode(trans, root, dir, dentry->d_name.name,
@ -4979,6 +5001,7 @@ static void btrfs_invalidatepage(struct page *page, unsigned long offset)
{
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_CACHE_SIZE - 1;
@ -4997,7 +5020,8 @@ static void btrfs_invalidatepage(struct page *page, unsigned long offset)
btrfs_releasepage(page, GFP_NOFS);
return;
}
lock_extent(tree, page_start, page_end, GFP_NOFS);
lock_extent_bits(tree, page_start, page_end, 0, &cached_state,
GFP_NOFS);
ordered = btrfs_lookup_ordered_extent(page->mapping->host,
page_offset(page));
if (ordered) {
@ -5008,7 +5032,7 @@ static void btrfs_invalidatepage(struct page *page, unsigned long offset)
clear_extent_bit(tree, page_start, page_end,
EXTENT_DIRTY | EXTENT_DELALLOC |
EXTENT_LOCKED | EXTENT_DO_ACCOUNTING, 1, 0,
NULL, GFP_NOFS);
&cached_state, GFP_NOFS);
/*
* whoever cleared the private bit is responsible
* for the finish_ordered_io
@ -5018,11 +5042,13 @@ static void btrfs_invalidatepage(struct page *page, unsigned long offset)
page_start, page_end);
}
btrfs_put_ordered_extent(ordered);
lock_extent(tree, page_start, page_end, GFP_NOFS);
cached_state = NULL;
lock_extent_bits(tree, page_start, page_end, 0, &cached_state,
GFP_NOFS);
}
clear_extent_bit(tree, page_start, page_end,
EXTENT_LOCKED | EXTENT_DIRTY | EXTENT_DELALLOC |
EXTENT_DO_ACCOUNTING, 1, 1, NULL, GFP_NOFS);
EXTENT_DO_ACCOUNTING, 1, 1, &cached_state, GFP_NOFS);
__btrfs_releasepage(page, GFP_NOFS);
ClearPageChecked(page);
@ -5055,6 +5081,7 @@ int btrfs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
struct btrfs_root *root = BTRFS_I(inode)->root;
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;
@ -5093,7 +5120,8 @@ again:
}
wait_on_page_writeback(page);
lock_extent(io_tree, page_start, page_end, GFP_NOFS);
lock_extent_bits(io_tree, page_start, page_end, 0, &cached_state,
GFP_NOFS);
set_page_extent_mapped(page);
/*
@ -5102,7 +5130,8 @@ again:
*/
ordered = btrfs_lookup_ordered_extent(inode, page_start);
if (ordered) {
unlock_extent(io_tree, page_start, page_end, GFP_NOFS);
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);
@ -5116,13 +5145,15 @@ again:
* is probably a better way to do this, but for now keep consistent with
* prepare_pages in the normal write path.
*/
clear_extent_bits(&BTRFS_I(inode)->io_tree, page_start, page_end,
clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start, page_end,
EXTENT_DIRTY | EXTENT_DELALLOC | EXTENT_DO_ACCOUNTING,
GFP_NOFS);
0, 0, &cached_state, GFP_NOFS);
ret = btrfs_set_extent_delalloc(inode, page_start, page_end);
ret = btrfs_set_extent_delalloc(inode, page_start, page_end,
&cached_state);
if (ret) {
unlock_extent(io_tree, page_start, page_end, GFP_NOFS);
unlock_extent_cached(io_tree, page_start, page_end,
&cached_state, GFP_NOFS);
ret = VM_FAULT_SIGBUS;
btrfs_free_reserved_data_space(root, inode, PAGE_CACHE_SIZE);
goto out_unlock;
@ -5148,7 +5179,7 @@ again:
BTRFS_I(inode)->last_trans = root->fs_info->generation;
BTRFS_I(inode)->last_sub_trans = BTRFS_I(inode)->root->log_transid;
unlock_extent(io_tree, page_start, page_end, GFP_NOFS);
unlock_extent_cached(io_tree, page_start, page_end, &cached_state, GFP_NOFS);
out_unlock:
btrfs_unreserve_metadata_for_delalloc(root, inode, 1);
@ -5827,6 +5858,7 @@ stop_trans:
static long btrfs_fallocate(struct inode *inode, int mode,
loff_t offset, loff_t len)
{
struct extent_state *cached_state = NULL;
u64 cur_offset;
u64 last_byte;
u64 alloc_start;
@ -5865,16 +5897,17 @@ static long btrfs_fallocate(struct inode *inode, int mode,
/* the extent lock is ordered inside the running
* transaction
*/
lock_extent(&BTRFS_I(inode)->io_tree, alloc_start, locked_end,
GFP_NOFS);
lock_extent_bits(&BTRFS_I(inode)->io_tree, alloc_start,
locked_end, 0, &cached_state, GFP_NOFS);
ordered = btrfs_lookup_first_ordered_extent(inode,
alloc_end - 1);
if (ordered &&
ordered->file_offset + ordered->len > alloc_start &&
ordered->file_offset < alloc_end) {
btrfs_put_ordered_extent(ordered);
unlock_extent(&BTRFS_I(inode)->io_tree,
alloc_start, locked_end, GFP_NOFS);
unlock_extent_cached(&BTRFS_I(inode)->io_tree,
alloc_start, locked_end,
&cached_state, GFP_NOFS);
/*
* we can't wait on the range with the transaction
* running or with the extent lock held
@ -5916,8 +5949,8 @@ static long btrfs_fallocate(struct inode *inode, int mode,
break;
}
}
unlock_extent(&BTRFS_I(inode)->io_tree, alloc_start, locked_end,
GFP_NOFS);
unlock_extent_cached(&BTRFS_I(inode)->io_tree, alloc_start, locked_end,
&cached_state, GFP_NOFS);
btrfs_free_reserved_data_space(BTRFS_I(inode)->root, inode,
alloc_end - alloc_start);

706
fs/btrfs/ioctl.c
View File

@ -48,6 +48,7 @@
#include "print-tree.h"
#include "volumes.h"
#include "locking.h"
#include "ctree.h"
/* Mask out flags that are inappropriate for the given type of inode. */
static inline __u32 btrfs_mask_flags(umode_t mode, __u32 flags)
@ -474,7 +475,79 @@ out_unlock:
return error;
}
static int btrfs_defrag_file(struct file *file)
static int should_defrag_range(struct inode *inode, u64 start, u64 len,
int thresh, u64 *last_len, u64 *skip,
u64 *defrag_end)
{
struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
struct extent_map *em = NULL;
struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
int ret = 1;
if (thresh == 0)
thresh = 256 * 1024;
/*
* make sure that once we start defragging and extent, we keep on
* defragging it
*/
if (start < *defrag_end)
return 1;
*skip = 0;
/*
* hopefully we have this extent in the tree already, try without
* the full extent lock
*/
read_lock(&em_tree->lock);
em = lookup_extent_mapping(em_tree, start, len);
read_unlock(&em_tree->lock);
if (!em) {
/* get the big lock and read metadata off disk */
lock_extent(io_tree, start, start + len - 1, GFP_NOFS);
em = btrfs_get_extent(inode, NULL, 0, start, len, 0);
unlock_extent(io_tree, start, start + len - 1, GFP_NOFS);
if (!em)
return 0;
}
/* this will cover holes, and inline extents */
if (em->block_start >= EXTENT_MAP_LAST_BYTE)
ret = 0;
/*
* we hit a real extent, if it is big don't bother defragging it again
*/
if ((*last_len == 0 || *last_len >= thresh) && em->len >= thresh)
ret = 0;
/*
* last_len ends up being a counter of how many bytes we've defragged.
* every time we choose not to defrag an extent, we reset *last_len
* so that the next tiny extent will force a defrag.
*
* The end result of this is that tiny extents before a single big
* extent will force at least part of that big extent to be defragged.
*/
if (ret) {
*last_len += len;
*defrag_end = extent_map_end(em);
} else {
*last_len = 0;
*skip = extent_map_end(em);
*defrag_end = 0;
}
free_extent_map(em);
return ret;
}
static int btrfs_defrag_file(struct file *file,
struct btrfs_ioctl_defrag_range_args *range)
{
struct inode *inode = fdentry(file)->d_inode;
struct btrfs_root *root = BTRFS_I(inode)->root;
@ -486,37 +559,96 @@ static int btrfs_defrag_file(struct file *file)
unsigned long total_read = 0;
u64 page_start;
u64 page_end;
u64 last_len = 0;
u64 skip = 0;
u64 defrag_end = 0;
unsigned long i;
int ret;
ret = btrfs_check_data_free_space(root, inode, inode->i_size);
if (ret)
return -ENOSPC;
if (inode->i_size == 0)
return 0;
if (range->start + range->len > range->start) {
last_index = min_t(u64, inode->i_size - 1,
range->start + range->len - 1) >> PAGE_CACHE_SHIFT;
} else {
last_index = (inode->i_size - 1) >> PAGE_CACHE_SHIFT;
}
i = range->start >> PAGE_CACHE_SHIFT;
while (i <= last_index) {
if (!should_defrag_range(inode, (u64)i << PAGE_CACHE_SHIFT,
PAGE_CACHE_SIZE,
range->extent_thresh,
&last_len, &skip,
&defrag_end)) {
unsigned long next;
/*
* the should_defrag function tells us how much to skip
* bump our counter by the suggested amount
*/
next = (skip + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
i = max(i + 1, next);
continue;
}
mutex_lock(&inode->i_mutex);
last_index = inode->i_size >> PAGE_CACHE_SHIFT;
for (i = 0; i <= last_index; i++) {
if (total_read % ra_pages == 0) {
btrfs_force_ra(inode->i_mapping, &file->f_ra, file, i,
min(last_index, i + ra_pages - 1));
}
total_read++;
mutex_lock(&inode->i_mutex);
if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)
BTRFS_I(inode)->force_compress = 1;
ret = btrfs_check_data_free_space(root, inode, PAGE_CACHE_SIZE);
if (ret) {
ret = -ENOSPC;
break;
}
ret = btrfs_reserve_metadata_for_delalloc(root, inode, 1);
if (ret) {
btrfs_free_reserved_data_space(root, inode,
PAGE_CACHE_SIZE);
ret = -ENOSPC;
break;
}
again:
if (inode->i_size == 0 ||
i > ((inode->i_size - 1) >> PAGE_CACHE_SHIFT)) {
ret = 0;
goto err_reservations;
}
page = grab_cache_page(inode->i_mapping, i);
if (!page)
goto out_unlock;
goto err_reservations;
if (!PageUptodate(page)) {
btrfs_readpage(NULL, page);
lock_page(page);
if (!PageUptodate(page)) {
unlock_page(page);
page_cache_release(page);
goto out_unlock;
goto err_reservations;
}
}
if (page->mapping != inode->i_mapping) {
unlock_page(page);
page_cache_release(page);
goto again;
}
wait_on_page_writeback(page);
if (PageDirty(page)) {
btrfs_free_reserved_data_space(root, inode,
PAGE_CACHE_SIZE);
goto loop_unlock;
}
page_start = (u64)page->index << PAGE_CACHE_SHIFT;
page_end = page_start + PAGE_CACHE_SIZE - 1;
lock_extent(io_tree, page_start, page_end, GFP_NOFS);
@ -537,18 +669,54 @@ again:
* page if it is dirtied again later
*/
clear_page_dirty_for_io(page);
clear_extent_bits(&BTRFS_I(inode)->io_tree, page_start,
page_end, EXTENT_DIRTY | EXTENT_DELALLOC |
EXTENT_DO_ACCOUNTING, GFP_NOFS);
btrfs_set_extent_delalloc(inode, page_start, page_end);
btrfs_set_extent_delalloc(inode, page_start, page_end, NULL);
ClearPageChecked(page);
set_page_dirty(page);
unlock_extent(io_tree, page_start, page_end, GFP_NOFS);
loop_unlock:
unlock_page(page);
page_cache_release(page);
mutex_unlock(&inode->i_mutex);
btrfs_unreserve_metadata_for_delalloc(root, inode, 1);
balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1);
i++;
}
if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO))
filemap_flush(inode->i_mapping);
if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) {
/* 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(&root->fs_info->async_submit_draining);
while (atomic_read(&root->fs_info->nr_async_submits) ||
atomic_read(&root->fs_info->async_delalloc_pages)) {
wait_event(root->fs_info->async_submit_wait,
(atomic_read(&root->fs_info->nr_async_submits) == 0 &&
atomic_read(&root->fs_info->async_delalloc_pages) == 0));
}
atomic_dec(&root->fs_info->async_submit_draining);
mutex_lock(&inode->i_mutex);
BTRFS_I(inode)->force_compress = 0;
mutex_unlock(&inode->i_mutex);
}
out_unlock:
mutex_unlock(&inode->i_mutex);
return 0;
err_reservations:
mutex_unlock(&inode->i_mutex);
btrfs_free_reserved_data_space(root, inode, PAGE_CACHE_SIZE);
btrfs_unreserve_metadata_for_delalloc(root, inode, 1);
return ret;
}
static noinline int btrfs_ioctl_resize(struct btrfs_root *root,
@ -608,7 +776,7 @@ static noinline int btrfs_ioctl_resize(struct btrfs_root *root,
mod = 1;
sizestr++;
}
new_size = btrfs_parse_size(sizestr);
new_size = memparse(sizestr, NULL);
if (new_size == 0) {
ret = -EINVAL;
goto out_unlock;
@ -743,6 +911,327 @@ out:
return ret;
}
static noinline int key_in_sk(struct btrfs_key *key,
struct btrfs_ioctl_search_key *sk)
{
struct btrfs_key test;
int ret;
test.objectid = sk->min_objectid;
test.type = sk->min_type;
test.offset = sk->min_offset;
ret = btrfs_comp_cpu_keys(key, &test);
if (ret < 0)
return 0;
test.objectid = sk->max_objectid;
test.type = sk->max_type;
test.offset = sk->max_offset;
ret = btrfs_comp_cpu_keys(key, &test);
if (ret > 0)
return 0;
return 1;
}
static noinline int copy_to_sk(struct btrfs_root *root,
struct btrfs_path *path,
struct btrfs_key *key,
struct btrfs_ioctl_search_key *sk,
char *buf,
unsigned long *sk_offset,
int *num_found)
{
u64 found_transid;
struct extent_buffer *leaf;
struct btrfs_ioctl_search_header sh;
unsigned long item_off;
unsigned long item_len;
int nritems;
int i;
int slot;
int found = 0;
int ret = 0;
leaf = path->nodes[0];
slot = path->slots[0];
nritems = btrfs_header_nritems(leaf);
if (btrfs_header_generation(leaf) > sk->max_transid) {
i = nritems;
goto advance_key;
}
found_transid = btrfs_header_generation(leaf);
for (i = slot; i < nritems; i++) {
item_off = btrfs_item_ptr_offset(leaf, i);
item_len = btrfs_item_size_nr(leaf, i);
if (item_len > BTRFS_SEARCH_ARGS_BUFSIZE)
item_len = 0;
if (sizeof(sh) + item_len + *sk_offset >
BTRFS_SEARCH_ARGS_BUFSIZE) {
ret = 1;
goto overflow;
}
btrfs_item_key_to_cpu(leaf, key, i);
if (!key_in_sk(key, sk))
continue;
sh.objectid = key->objectid;
sh.offset = key->offset;
sh.type = key->type;
sh.len = item_len;
sh.transid = found_transid;
/* copy search result header */
memcpy(buf + *sk_offset, &sh, sizeof(sh));
*sk_offset += sizeof(sh);
if (item_len) {
char *p = buf + *sk_offset;
/* copy the item */
read_extent_buffer(leaf, p,
item_off, item_len);
*sk_offset += item_len;
}
found++;
if (*num_found >= sk->nr_items)
break;
}
advance_key:
ret = 0;
if (key->offset < (u64)-1 && key->offset < sk->max_offset)
key->offset++;
else if (key->type < (u8)-1 && key->type < sk->max_type) {
key->offset = 0;
key->type++;
} else if (key->objectid < (u64)-1 && key->objectid < sk->max_objectid) {
key->offset = 0;
key->type = 0;
key->objectid++;
} else
ret = 1;
overflow:
*num_found += found;
return ret;
}
static noinline int search_ioctl(struct inode *inode,
struct btrfs_ioctl_search_args *args)
{
struct btrfs_root *root;
struct btrfs_key key;
struct btrfs_key max_key;
struct btrfs_path *path;
struct btrfs_ioctl_search_key *sk = &args->key;
struct btrfs_fs_info *info = BTRFS_I(inode)->root->fs_info;
int ret;
int num_found = 0;
unsigned long sk_offset = 0;
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
if (sk->tree_id == 0) {
/* search the root of the inode that was passed */
root = BTRFS_I(inode)->root;
} else {
key.objectid = sk->tree_id;
key.type = BTRFS_ROOT_ITEM_KEY;
key.offset = (u64)-1;
root = btrfs_read_fs_root_no_name(info, &key);
if (IS_ERR(root)) {
printk(KERN_ERR "could not find root %llu\n",
sk->tree_id);
btrfs_free_path(path);
return -ENOENT;
}
}
key.objectid = sk->min_objectid;
key.type = sk->min_type;
key.offset = sk->min_offset;
max_key.objectid = sk->max_objectid;
max_key.type = sk->max_type;
max_key.offset = sk->max_offset;
path->keep_locks = 1;
while(1) {
ret = btrfs_search_forward(root, &key, &max_key, path, 0,
sk->min_transid);
if (ret != 0) {
if (ret > 0)
ret = 0;
goto err;
}
ret = copy_to_sk(root, path, &key, sk, args->buf,
&sk_offset, &num_found);
btrfs_release_path(root, path);
if (ret || num_found >= sk->nr_items)
break;
}
ret = 0;
err:
sk->nr_items = num_found;
btrfs_free_path(path);
return ret;
}
static noinline int btrfs_ioctl_tree_search(struct file *file,
void __user *argp)
{
struct btrfs_ioctl_search_args *args;
struct inode *inode;
int ret;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
args = kmalloc(sizeof(*args), GFP_KERNEL);
if (!args)
return -ENOMEM;
if (copy_from_user(args, argp, sizeof(*args))) {
kfree(args);
return -EFAULT;
}
inode = fdentry(file)->d_inode;
ret = search_ioctl(inode, args);
if (ret == 0 && copy_to_user(argp, args, sizeof(*args)))
ret = -EFAULT;
kfree(args);
return ret;
}
/*
* Search INODE_REFs to identify path name of 'dirid' directory
* in a 'tree_id' tree. and sets path name to 'name'.
*/
static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info,
u64 tree_id, u64 dirid, char *name)
{
struct btrfs_root *root;
struct btrfs_key key;
char *ptr;
int ret = -1;
int slot;
int len;
int total_len = 0;
struct btrfs_inode_ref *iref;
struct extent_buffer *l;
struct btrfs_path *path;
if (dirid == BTRFS_FIRST_FREE_OBJECTID) {
name[0]='\0';
return 0;
}
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX];
key.objectid = tree_id;
key.type = BTRFS_ROOT_ITEM_KEY;
key.offset = (u64)-1;
root = btrfs_read_fs_root_no_name(info, &key);
if (IS_ERR(root)) {
printk(KERN_ERR "could not find root %llu\n", tree_id);
ret = -ENOENT;
goto out;
}
key.objectid = dirid;
key.type = BTRFS_INODE_REF_KEY;
key.offset = (u64)-1;
while(1) {
ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
if (ret < 0)
goto out;
l = path->nodes[0];
slot = path->slots[0];
if (ret > 0 && slot > 0)
slot--;
btrfs_item_key_to_cpu(l, &key, slot);
if (ret > 0 && (key.objectid != dirid ||
key.type != BTRFS_INODE_REF_KEY)) {
ret = -ENOENT;
goto out;
}
iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref);
len = btrfs_inode_ref_name_len(l, iref);
ptr -= len + 1;
total_len += len + 1;
if (ptr < name)
goto out;
*(ptr + len) = '/';
read_extent_buffer(l, ptr,(unsigned long)(iref + 1), len);
if (key.offset == BTRFS_FIRST_FREE_OBJECTID)
break;
btrfs_release_path(root, path);
key.objectid = key.offset;
key.offset = (u64)-1;
dirid = key.objectid;
}
if (ptr < name)
goto out;
memcpy(name, ptr, total_len);
name[total_len]='\0';
ret = 0;
out:
btrfs_free_path(path);
return ret;
}
static noinline int btrfs_ioctl_ino_lookup(struct file *file,
void __user *argp)
{
struct btrfs_ioctl_ino_lookup_args *args;
struct inode *inode;
int ret;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
args = kmalloc(sizeof(*args), GFP_KERNEL);
if (copy_from_user(args, argp, sizeof(*args))) {
kfree(args);
return -EFAULT;
}
inode = fdentry(file)->d_inode;
if (args->treeid == 0)
args->treeid = BTRFS_I(inode)->root->root_key.objectid;
ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info,
args->treeid, args->objectid,
args->name);
if (ret == 0 && copy_to_user(argp, args, sizeof(*args)))
ret = -EFAULT;
kfree(args);
return ret;
}
static noinline int btrfs_ioctl_snap_destroy(struct file *file,
void __user *arg)
{
@ -849,10 +1338,11 @@ out:
return err;
}
static int btrfs_ioctl_defrag(struct file *file)
static int btrfs_ioctl_defrag(struct file *file, void __user *argp)
{
struct inode *inode = fdentry(file)->d_inode;
struct btrfs_root *root = BTRFS_I(inode)->root;
struct btrfs_ioctl_defrag_range_args *range;
int ret;
ret = mnt_want_write(file->f_path.mnt);
@ -873,7 +1363,30 @@ static int btrfs_ioctl_defrag(struct file *file)
ret = -EINVAL;
goto out;
}
btrfs_defrag_file(file);
range = kzalloc(sizeof(*range), GFP_KERNEL);
if (!range) {
ret = -ENOMEM;
goto out;
}
if (argp) {
if (copy_from_user(range, argp,
sizeof(*range))) {
ret = -EFAULT;
kfree(range);
}
/* compression requires us to start the IO */
if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) {
range->flags |= BTRFS_DEFRAG_RANGE_START_IO;
range->extent_thresh = (u32)-1;
}
} else {
/* the rest are all set to zero by kzalloc */
range->len = (u64)-1;
}
btrfs_defrag_file(file, range);
kfree(range);
break;
}
out:
@ -1274,6 +1787,157 @@ out:
return ret;
}
static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp)
{
struct inode *inode = fdentry(file)->d_inode;
struct btrfs_root *root = BTRFS_I(inode)->root;
struct btrfs_root *new_root;
struct btrfs_dir_item *di;
struct btrfs_trans_handle *trans;
struct btrfs_path *path;
struct btrfs_key location;
struct btrfs_disk_key disk_key;
struct btrfs_super_block *disk_super;
u64 features;
u64 objectid = 0;
u64 dir_id;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
if (copy_from_user(&objectid, argp, sizeof(objectid)))
return -EFAULT;
if (!objectid)
objectid = root->root_key.objectid;
location.objectid = objectid;
location.type = BTRFS_ROOT_ITEM_KEY;
location.offset = (u64)-1;
new_root = btrfs_read_fs_root_no_name(root->fs_info, &location);
if (IS_ERR(new_root))
return PTR_ERR(new_root);
if (btrfs_root_refs(&new_root->root_item) == 0)
return -ENOENT;
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
path->leave_spinning = 1;
trans = btrfs_start_transaction(root, 1);
if (!trans) {
btrfs_free_path(path);
return -ENOMEM;
}
dir_id = btrfs_super_root_dir(&root->fs_info->super_copy);
di = btrfs_lookup_dir_item(trans, root->fs_info->tree_root, path,
dir_id, "default", 7, 1);
if (!di) {
btrfs_free_path(path);
btrfs_end_transaction(trans, root);
printk(KERN_ERR "Umm, you don't have the default dir item, "
"this isn't going to work\n");
return -ENOENT;
}
btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key);
btrfs_set_dir_item_key(path->nodes[0], di, &disk_key);
btrfs_mark_buffer_dirty(path->nodes[0]);
btrfs_free_path(path);
disk_super = &root->fs_info->super_copy;
features = btrfs_super_incompat_flags(disk_super);
if (!(features & BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL)) {
features |= BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL;
btrfs_set_super_incompat_flags(disk_super, features);
}
btrfs_end_transaction(trans, root);
return 0;
}
long btrfs_ioctl_space_info(struct btrfs_root *root, void __user *arg)
{
struct btrfs_ioctl_space_args space_args;
struct btrfs_ioctl_space_info space;
struct btrfs_ioctl_space_info *dest;
struct btrfs_ioctl_space_info *dest_orig;
struct btrfs_ioctl_space_info *user_dest;
struct btrfs_space_info *info;
int alloc_size;
int ret = 0;
int slot_count = 0;
if (copy_from_user(&space_args,
(struct btrfs_ioctl_space_args __user *)arg,
sizeof(space_args)))
return -EFAULT;
/* first we count slots */
rcu_read_lock();
list_for_each_entry_rcu(info, &root->fs_info->space_info, list)
slot_count++;
rcu_read_unlock();
/* space_slots == 0 means they are asking for a count */
if (space_args.space_slots == 0) {
space_args.total_spaces = slot_count;
goto out;
}
alloc_size = sizeof(*dest) * slot_count;
/* we generally have at most 6 or so space infos, one for each raid
* level. So, a whole page should be more than enough for everyone
*/
if (alloc_size > PAGE_CACHE_SIZE)
return -ENOMEM;
space_args.total_spaces = 0;
dest = kmalloc(alloc_size, GFP_NOFS);
if (!dest)
return -ENOMEM;
dest_orig = dest;
/* now we have a buffer to copy into */
rcu_read_lock();
list_for_each_entry_rcu(info, &root->fs_info->space_info, list) {
/* make sure we don't copy more than we allocated
* in our buffer
*/
if (slot_count == 0)
break;
slot_count--;
/* make sure userland has enough room in their buffer */
if (space_args.total_spaces >= space_args.space_slots)
break;
space.flags = info->flags;
space.total_bytes = info->total_bytes;
space.used_bytes = info->bytes_used;
memcpy(dest, &space, sizeof(space));
dest++;
space_args.total_spaces++;
}
rcu_read_unlock();
user_dest = (struct btrfs_ioctl_space_info *)
(arg + sizeof(struct btrfs_ioctl_space_args));
if (copy_to_user(user_dest, dest_orig, alloc_size))
ret = -EFAULT;
kfree(dest_orig);
out:
if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args)))
ret = -EFAULT;
return ret;
}
/*
* there are many ways the trans_start and trans_end ioctls can lead
* to deadlocks. They should only be used by applications that
@ -1320,8 +1984,12 @@ long btrfs_ioctl(struct file *file, unsigned int
return btrfs_ioctl_snap_create(file, argp, 1);
case BTRFS_IOC_SNAP_DESTROY:
return btrfs_ioctl_snap_destroy(file, argp);
case BTRFS_IOC_DEFAULT_SUBVOL:
return btrfs_ioctl_default_subvol(file, argp);
case BTRFS_IOC_DEFRAG:
return btrfs_ioctl_defrag(file);
return btrfs_ioctl_defrag(file, NULL);
case BTRFS_IOC_DEFRAG_RANGE:
return btrfs_ioctl_defrag(file, argp);
case BTRFS_IOC_RESIZE:
return btrfs_ioctl_resize(root, argp);
case BTRFS_IOC_ADD_DEV:
@ -1338,6 +2006,12 @@ long btrfs_ioctl(struct file *file, unsigned int
return btrfs_ioctl_trans_start(file);
case BTRFS_IOC_TRANS_END:
return btrfs_ioctl_trans_end(file);
case BTRFS_IOC_TREE_SEARCH:
return btrfs_ioctl_tree_search(file, argp);
case BTRFS_IOC_INO_LOOKUP:
return btrfs_ioctl_ino_lookup(file, argp);
case BTRFS_IOC_SPACE_INFO:
return btrfs_ioctl_space_info(root, argp);
case BTRFS_IOC_SYNC:
btrfs_sync_fs(file->f_dentry->d_sb, 1);
return 0;

111
fs/btrfs/ioctl.h
View File

@ -30,12 +30,114 @@ struct btrfs_ioctl_vol_args {
char name[BTRFS_PATH_NAME_MAX + 1];
};
#define BTRFS_INO_LOOKUP_PATH_MAX 4080
struct btrfs_ioctl_ino_lookup_args {
__u64 treeid;
__u64 objectid;
char name[BTRFS_INO_LOOKUP_PATH_MAX];
};
struct btrfs_ioctl_search_key {
/* which root are we searching. 0 is the tree of tree roots */
__u64 tree_id;
/* keys returned will be >= min and <= max */
__u64 min_objectid;
__u64 max_objectid;
/* keys returned will be >= min and <= max */
__u64 min_offset;
__u64 max_offset;
/* max and min transids to search for */
__u64 min_transid;
__u64 max_transid;
/* keys returned will be >= min and <= max */
__u32 min_type;
__u32 max_type;
/*
* how many items did userland ask for, and how many are we
* returning
*/
__u32 nr_items;
/* align to 64 bits */
__u32 unused;
/* some extra for later */
__u64 unused1;
__u64 unused2;
__u64 unused3;
__u64 unused4;
};
struct btrfs_ioctl_search_header {
__u64 transid;
__u64 objectid;
__u64 offset;
__u32 type;
__u32 len;
};
#define BTRFS_SEARCH_ARGS_BUFSIZE (4096 - sizeof(struct btrfs_ioctl_search_key))
/*
* the buf is an array of search headers where
* each header is followed by the actual item
* the type field is expanded to 32 bits for alignment
*/
struct btrfs_ioctl_search_args {
struct btrfs_ioctl_search_key key;
char buf[BTRFS_SEARCH_ARGS_BUFSIZE];
};
struct btrfs_ioctl_clone_range_args {
__s64 src_fd;
__u64 src_offset, src_length;
__u64 dest_offset;
};
/* flags for the defrag range ioctl */
#define BTRFS_DEFRAG_RANGE_COMPRESS 1
#define BTRFS_DEFRAG_RANGE_START_IO 2
struct btrfs_ioctl_defrag_range_args {
/* start of the defrag operation */
__u64 start;
/* number of bytes to defrag, use (u64)-1 to say all */
__u64 len;
/*
* flags for the operation, which can include turning
* on compression for this one defrag
*/
__u64 flags;
/*
* any extent bigger than this will be considered
* already defragged. Use 0 to take the kernel default
* Use 1 to say every single extent must be rewritten
*/
__u32 extent_thresh;
/* spare for later */
__u32 unused[5];
};
struct btrfs_ioctl_space_info {
__u64 flags;
__u64 total_bytes;
__u64 used_bytes;
};
struct btrfs_ioctl_space_args {
__u64 space_slots;
__u64 total_spaces;
struct btrfs_ioctl_space_info spaces[0];
};
#define BTRFS_IOC_SNAP_CREATE _IOW(BTRFS_IOCTL_MAGIC, 1, \
struct btrfs_ioctl_vol_args)
#define BTRFS_IOC_DEFRAG _IOW(BTRFS_IOCTL_MAGIC, 2, \
@ -67,4 +169,13 @@ struct btrfs_ioctl_clone_range_args {
struct btrfs_ioctl_vol_args)
#define BTRFS_IOC_SNAP_DESTROY _IOW(BTRFS_IOCTL_MAGIC, 15, \
struct btrfs_ioctl_vol_args)
#define BTRFS_IOC_DEFRAG_RANGE _IOW(BTRFS_IOCTL_MAGIC, 16, \
struct btrfs_ioctl_defrag_range_args)
#define BTRFS_IOC_TREE_SEARCH _IOWR(BTRFS_IOCTL_MAGIC, 17, \
struct btrfs_ioctl_search_args)
#define BTRFS_IOC_INO_LOOKUP _IOWR(BTRFS_IOCTL_MAGIC, 18, \
struct btrfs_ioctl_ino_lookup_args)
#define BTRFS_IOC_DEFAULT_SUBVOL _IOW(BTRFS_IOCTL_MAGIC, 19, u64)
#define BTRFS_IOC_SPACE_INFO _IOWR(BTRFS_IOCTL_MAGIC, 20, \
struct btrfs_ioctl_space_args)
#endif

41
fs/btrfs/ordered-data.c
View File

@ -174,7 +174,6 @@ int btrfs_add_ordered_extent(struct inode *inode, u64 file_offset,
if (!entry)
return -ENOMEM;
mutex_lock(&tree->mutex);
entry->file_offset = file_offset;
entry->start = start;
entry->len = len;
@ -190,16 +189,17 @@ int btrfs_add_ordered_extent(struct inode *inode, u64 file_offset,
INIT_LIST_HEAD(&entry->list);
INIT_LIST_HEAD(&entry->root_extent_list);
spin_lock(&tree->lock);
node = tree_insert(&tree->tree, file_offset,
&entry->rb_node);
BUG_ON(node);
spin_unlock(&tree->lock);
spin_lock(&BTRFS_I(inode)->root->fs_info->ordered_extent_lock);
list_add_tail(&entry->root_extent_list,
&BTRFS_I(inode)->root->fs_info->ordered_extents);
spin_unlock(&BTRFS_I(inode)->root->fs_info->ordered_extent_lock);
mutex_unlock(&tree->mutex);
BUG_ON(node);
return 0;
}
@ -216,9 +216,9 @@ int btrfs_add_ordered_sum(struct inode *inode,
struct btrfs_ordered_inode_tree *tree;
tree = &BTRFS_I(inode)->ordered_tree;
mutex_lock(&tree->mutex);
spin_lock(&tree->lock);
list_add_tail(&sum->list, &entry->list);
mutex_unlock(&tree->mutex);
spin_unlock(&tree->lock);
return 0;
}
@ -232,15 +232,16 @@ int btrfs_add_ordered_sum(struct inode *inode,
* to make sure this function only returns 1 once for a given ordered extent.
*/
int btrfs_dec_test_ordered_pending(struct inode *inode,
struct btrfs_ordered_extent **cached,
u64 file_offset, u64 io_size)
{
struct btrfs_ordered_inode_tree *tree;
struct rb_node *node;
struct btrfs_ordered_extent *entry;
struct btrfs_ordered_extent *entry = NULL;
int ret;
tree = &BTRFS_I(inode)->ordered_tree;
mutex_lock(&tree->mutex);
spin_lock(&tree->lock);
node = tree_search(tree, file_offset);
if (!node) {
ret = 1;
@ -264,7 +265,11 @@ int btrfs_dec_test_ordered_pending(struct inode *inode,
else
ret = 1;
out:
mutex_unlock(&tree->mutex);
if (!ret && cached && entry) {
*cached = entry;
atomic_inc(&entry->refs);
}
spin_unlock(&tree->lock);
return ret == 0;
}
@ -291,7 +296,7 @@ int btrfs_put_ordered_extent(struct btrfs_ordered_extent *entry)
/*
* remove an ordered extent from the tree. No references are dropped
* and you must wake_up entry->wait. You must hold the tree mutex
* and you must wake_up entry->wait. You must hold the tree lock
* while you call this function.
*/
static int __btrfs_remove_ordered_extent(struct inode *inode,
@ -340,9 +345,9 @@ int btrfs_remove_ordered_extent(struct inode *inode,
int ret;
tree = &BTRFS_I(inode)->ordered_tree;
mutex_lock(&tree->mutex);
spin_lock(&tree->lock);
ret = __btrfs_remove_ordered_extent(inode, entry);
mutex_unlock(&tree->mutex);
spin_unlock(&tree->lock);
wake_up(&entry->wait);
return ret;
@ -567,7 +572,7 @@ struct btrfs_ordered_extent *btrfs_lookup_ordered_extent(struct inode *inode,
struct btrfs_ordered_extent *entry = NULL;
tree = &BTRFS_I(inode)->ordered_tree;
mutex_lock(&tree->mutex);
spin_lock(&tree->lock);
node = tree_search(tree, file_offset);
if (!node)
goto out;
@ -578,7 +583,7 @@ struct btrfs_ordered_extent *btrfs_lookup_ordered_extent(struct inode *inode,
if (entry)
atomic_inc(&entry->refs);
out:
mutex_unlock(&tree->mutex);
spin_unlock(&tree->lock);
return entry;
}
@ -594,7 +599,7 @@ btrfs_lookup_first_ordered_extent(struct inode *inode, u64 file_offset)
struct btrfs_ordered_extent *entry = NULL;
tree = &BTRFS_I(inode)->ordered_tree;
mutex_lock(&tree->mutex);
spin_lock(&tree->lock);
node = tree_search(tree, file_offset);
if (!node)
goto out;
@ -602,7 +607,7 @@ btrfs_lookup_first_ordered_extent(struct inode *inode, u64 file_offset)
entry = rb_entry(node, struct btrfs_ordered_extent, rb_node);
atomic_inc(&entry->refs);
out:
mutex_unlock(&tree->mutex);
spin_unlock(&tree->lock);
return entry;
}
@ -629,7 +634,7 @@ int btrfs_ordered_update_i_size(struct inode *inode, u64 offset,
else
offset = ALIGN(offset, BTRFS_I(inode)->root->sectorsize);
mutex_lock(&tree->mutex);
spin_lock(&tree->lock);
disk_i_size = BTRFS_I(inode)->disk_i_size;
/* truncate file */
@ -735,7 +740,7 @@ out:
*/
if (ordered)
__btrfs_remove_ordered_extent(inode, ordered);
mutex_unlock(&tree->mutex);
spin_unlock(&tree->lock);
if (ordered)
wake_up(&ordered->wait);
return ret;
@ -762,7 +767,7 @@ int btrfs_find_ordered_sum(struct inode *inode, u64 offset, u64 disk_bytenr,
if (!ordered)
return 1;
mutex_lock(&tree->mutex);
spin_lock(&tree->lock);
list_for_each_entry_reverse(ordered_sum, &ordered->list, list) {
if (disk_bytenr >= ordered_sum->bytenr) {
num_sectors = ordered_sum->len / sectorsize;
@ -777,7 +782,7 @@ int btrfs_find_ordered_sum(struct inode *inode, u64 offset, u64 disk_bytenr,
}
}
out:
mutex_unlock(&tree->mutex);
spin_unlock(&tree->lock);
btrfs_put_ordered_extent(ordered);
return ret;
}

7
fs/btrfs/ordered-data.h
View File

@ -21,7 +21,7 @@
/* one of these per inode */
struct btrfs_ordered_inode_tree {
struct mutex mutex;
spinlock_t lock;
struct rb_root tree;
struct rb_node *last;
};
@ -128,7 +128,7 @@ static inline int btrfs_ordered_sum_size(struct btrfs_root *root,
static inline void
btrfs_ordered_inode_tree_init(struct btrfs_ordered_inode_tree *t)
{
mutex_init(&t->mutex);
spin_lock_init(&t->lock);
t->tree = RB_ROOT;
t->last = NULL;
}
@ -137,7 +137,8 @@ int btrfs_put_ordered_extent(struct btrfs_ordered_extent *entry);
int btrfs_remove_ordered_extent(struct inode *inode,
struct btrfs_ordered_extent *entry);
int btrfs_dec_test_ordered_pending(struct inode *inode,
u64 file_offset, u64 io_size);
struct btrfs_ordered_extent **cached,
u64 file_offset, u64 io_size);
int btrfs_add_ordered_extent(struct inode *inode, u64 file_offset,
u64 start, u64 len, u64 disk_len, int tyep);
int btrfs_add_ordered_sum(struct inode *inode,

4
fs/btrfs/relocation.c
View File

@ -2659,7 +2659,7 @@ static int relocate_file_extent_cluster(struct inode *inode,
EXTENT_BOUNDARY, GFP_NOFS);
nr++;
}
btrfs_set_extent_delalloc(inode, page_start, page_end);
btrfs_set_extent_delalloc(inode, page_start, page_end, NULL);
set_page_dirty(page);
dirty_page++;
@ -3487,7 +3487,7 @@ static struct inode *create_reloc_inode(struct btrfs_fs_info *fs_info,
key.objectid = objectid;
key.type = BTRFS_INODE_ITEM_KEY;
key.offset = 0;
inode = btrfs_iget(root->fs_info->sb, &key, root);
inode = btrfs_iget(root->fs_info->sb, &key, root, NULL);
BUG_ON(IS_ERR(inode) || is_bad_inode(inode));
BTRFS_I(inode)->index_cnt = group->key.objectid;

240
fs/btrfs/super.c
View File

@ -63,10 +63,10 @@ static void btrfs_put_super(struct super_block *sb)
}
enum {
Opt_degraded, Opt_subvol, Opt_device, Opt_nodatasum, Opt_nodatacow,
Opt_max_extent, Opt_max_inline, Opt_alloc_start, Opt_nobarrier,
Opt_ssd, Opt_nossd, Opt_ssd_spread, Opt_thread_pool, Opt_noacl,
Opt_compress, Opt_compress_force, Opt_notreelog, Opt_ratio,
Opt_degraded, Opt_subvol, Opt_subvolid, Opt_device, Opt_nodatasum,
Opt_nodatacow, Opt_max_extent, Opt_max_inline, Opt_alloc_start,
Opt_nobarrier, Opt_ssd, Opt_nossd, Opt_ssd_spread, Opt_thread_pool,
Opt_noacl, Opt_compress, Opt_compress_force, Opt_notreelog, Opt_ratio,
Opt_flushoncommit,
Opt_discard, Opt_err,
};
@ -74,6 +74,7 @@ enum {
static match_table_t tokens = {
{Opt_degraded, "degraded"},
{Opt_subvol, "subvol=%s"},
{Opt_subvolid, "subvolid=%d"},
{Opt_device, "device=%s"},
{Opt_nodatasum, "nodatasum"},
{Opt_nodatacow, "nodatacow"},
@ -95,31 +96,6 @@ static match_table_t tokens = {
{Opt_err, NULL},
};
u64 btrfs_parse_size(char *str)
{
u64 res;
int mult = 1;
char *end;
char last;
res = simple_strtoul(str, &end, 10);
last = end[0];
if (isalpha(last)) {
last = tolower(last);
switch (last) {
case 'g':
mult *= 1024;
case 'm':
mult *= 1024;
case 'k':
mult *= 1024;
}
res = res * mult;
}
return res;
}
/*
* Regular mount options parser. Everything that is needed only when
* reading in a new superblock is parsed here.
@ -157,6 +133,7 @@ int btrfs_parse_options(struct btrfs_root *root, char *options)
btrfs_set_opt(info->mount_opt, DEGRADED);
break;
case Opt_subvol:
case Opt_subvolid:
case Opt_device:
/*
* These are parsed by btrfs_parse_early_options
@ -214,7 +191,7 @@ int btrfs_parse_options(struct btrfs_root *root, char *options)
case Opt_max_extent:
num = match_strdup(&args[0]);
if (num) {
info->max_extent = btrfs_parse_size(num);
info->max_extent = memparse(num, NULL);
kfree(num);
info->max_extent = max_t(u64,
@ -226,7 +203,7 @@ int btrfs_parse_options(struct btrfs_root *root, char *options)
case Opt_max_inline:
num = match_strdup(&args[0]);
if (num) {
info->max_inline = btrfs_parse_size(num);
info->max_inline = memparse(num, NULL);
kfree(num);
if (info->max_inline) {
@ -241,7 +218,7 @@ int btrfs_parse_options(struct btrfs_root *root, char *options)
case Opt_alloc_start:
num = match_strdup(&args[0]);
if (num) {
info->alloc_start = btrfs_parse_size(num);
info->alloc_start = memparse(num, NULL);
kfree(num);
printk(KERN_INFO
"btrfs: allocations start at %llu\n",
@ -292,12 +269,13 @@ out:
* only when we need to allocate a new super block.
*/
static int btrfs_parse_early_options(const char *options, fmode_t flags,
void *holder, char **subvol_name,
void *holder, char **subvol_name, u64 *subvol_objectid,
struct btrfs_fs_devices **fs_devices)
{
substring_t args[MAX_OPT_ARGS];
char *opts, *p;
int error = 0;
int intarg;
if (!options)
goto out;
@ -320,6 +298,18 @@ static int btrfs_parse_early_options(const char *options, fmode_t flags,
case Opt_subvol:
*subvol_name = match_strdup(&args[0]);
break;
case Opt_subvolid:
intarg = 0;
error = match_int(&args[0], &intarg);
if (!error) {
/* we want the original fs_tree */
if (!intarg)
*subvol_objectid =
BTRFS_FS_TREE_OBJECTID;
else
*subvol_objectid = intarg;
}
break;
case Opt_device:
error = btrfs_scan_one_device(match_strdup(&args[0]),
flags, holder, fs_devices);
@ -347,6 +337,110 @@ static int btrfs_parse_early_options(const char *options, fmode_t flags,
return error;
}
static struct dentry *get_default_root(struct super_block *sb,
u64 subvol_objectid)
{
struct btrfs_root *root = sb->s_fs_info;
struct btrfs_root *new_root;
struct btrfs_dir_item *di;
struct btrfs_path *path;
struct btrfs_key location;
struct inode *inode;
struct dentry *dentry;
u64 dir_id;
int new = 0;
/*
* We have a specific subvol we want to mount, just setup location and
* go look up the root.
*/
if (subvol_objectid) {
location.objectid = subvol_objectid;
location.type = BTRFS_ROOT_ITEM_KEY;
location.offset = (u64)-1;
goto find_root;
}
path = btrfs_alloc_path();
if (!path)
return ERR_PTR(-ENOMEM);
path->leave_spinning = 1;
/*
* Find the "default" dir item which points to the root item that we
* will mount by default if we haven't been given a specific subvolume
* to mount.
*/
dir_id = btrfs_super_root_dir(&root->fs_info->super_copy);
di = btrfs_lookup_dir_item(NULL, root, path, dir_id, "default", 7, 0);
if (!di) {
/*
* Ok the default dir item isn't there. This is weird since
* it's always been there, but don't freak out, just try and
* mount to root most subvolume.
*/
btrfs_free_path(path);
dir_id = BTRFS_FIRST_FREE_OBJECTID;
new_root = root->fs_info->fs_root;
goto setup_root;
}
btrfs_dir_item_key_to_cpu(path->nodes[0], di, &location);
btrfs_free_path(path);
find_root:
new_root = btrfs_read_fs_root_no_name(root->fs_info, &location);
if (IS_ERR(new_root))
return ERR_PTR(PTR_ERR(new_root));
if (btrfs_root_refs(&new_root->root_item) == 0)
return ERR_PTR(-ENOENT);
dir_id = btrfs_root_dirid(&new_root->root_item);
setup_root:
location.objectid = dir_id;
location.type = BTRFS_INODE_ITEM_KEY;
location.offset = 0;
inode = btrfs_iget(sb, &location, new_root, &new);
if (!inode)
return ERR_PTR(-ENOMEM);
/*
* If we're just mounting the root most subvol put the inode and return
* a reference to the dentry. We will have already gotten a reference
* to the inode in btrfs_fill_super so we're good to go.
*/
if (!new && sb->s_root->d_inode == inode) {
iput(inode);
return dget(sb->s_root);
}
if (new) {
const struct qstr name = { .name = "/", .len = 1 };
/*
* New inode, we need to make the dentry a sibling of s_root so
* everything gets cleaned up properly on unmount.
*/
dentry = d_alloc(sb->s_root, &name);
if (!dentry) {
iput(inode);
return ERR_PTR(-ENOMEM);
}
d_splice_alias(inode, dentry);
} else {
/*
* We found the inode in cache, just find a dentry for it and
* put the reference to the inode we just got.
*/
dentry = d_find_alias(inode);
iput(inode);
}
return dentry;
}
static int btrfs_fill_super(struct super_block *sb,
struct btrfs_fs_devices *fs_devices,
void *data, int silent)
@ -380,7 +474,7 @@ static int btrfs_fill_super(struct super_block *sb,
key.objectid = BTRFS_FIRST_FREE_OBJECTID;
key.type = BTRFS_INODE_ITEM_KEY;
key.offset = 0;
inode = btrfs_iget(sb, &key, tree_root->fs_info->fs_root);
inode = btrfs_iget(sb, &key, tree_root->fs_info->fs_root, NULL);
if (IS_ERR(inode)) {
err = PTR_ERR(inode);
goto fail_close;
@ -392,12 +486,6 @@ static int btrfs_fill_super(struct super_block *sb,
err = -ENOMEM;
goto fail_close;
}
#if 0
/* this does the super kobj at the same time */
err = btrfs_sysfs_add_super(tree_root->fs_info);
if (err)
goto fail_close;
#endif
sb->s_root = root_dentry;
@ -489,19 +577,22 @@ static int btrfs_test_super(struct super_block *s, void *data)
static int btrfs_get_sb(struct file_system_type *fs_type, int flags,
const char *dev_name, void *data, struct vfsmount *mnt)
{
char *subvol_name = NULL;
struct block_device *bdev = NULL;
struct super_block *s;
struct dentry *root;
struct btrfs_fs_devices *fs_devices = NULL;
fmode_t mode = FMODE_READ;
char *subvol_name = NULL;
u64 subvol_objectid = 0;
int error = 0;
int found = 0;
if (!(flags & MS_RDONLY))
mode |= FMODE_WRITE;
error = btrfs_parse_early_options(data, mode, fs_type,
&subvol_name, &fs_devices);
&subvol_name, &subvol_objectid,
&fs_devices);
if (error)
return error;
@ -530,6 +621,7 @@ static int btrfs_get_sb(struct file_system_type *fs_type, int flags,
goto error_close_devices;
}
found = 1;
btrfs_close_devices(fs_devices);
} else {
char b[BDEVNAME_SIZE];
@ -547,25 +639,35 @@ static int btrfs_get_sb(struct file_system_type *fs_type, int flags,
s->s_flags |= MS_ACTIVE;
}
if (!strcmp(subvol_name, "."))
root = dget(s->s_root);
else {
mutex_lock(&s->s_root->d_inode->i_mutex);
root = lookup_one_len(subvol_name, s->s_root,
root = get_default_root(s, subvol_objectid);
if (IS_ERR(root)) {
error = PTR_ERR(root);
deactivate_locked_super(s);
goto error;
}
/* if they gave us a subvolume name bind mount into that */
if (strcmp(subvol_name, ".")) {
struct dentry *new_root;
mutex_lock(&root->d_inode->i_mutex);
new_root = lookup_one_len(subvol_name, root,
strlen(subvol_name));
mutex_unlock(&s->s_root->d_inode->i_mutex);
mutex_unlock(&root->d_inode->i_mutex);
if (IS_ERR(root)) {
if (IS_ERR(new_root)) {
deactivate_locked_super(s);
error = PTR_ERR(root);
goto error_free_subvol_name;
}
if (!root->d_inode) {
error = PTR_ERR(new_root);
dput(root);
goto error_close_devices;
}
if (!new_root->d_inode) {
dput(root);
dput(new_root);
deactivate_locked_super(s);
error = -ENXIO;
goto error_free_subvol_name;
goto error_close_devices;
}
dput(root);
root = new_root;
}
mnt->mnt_sb = s;
@ -580,6 +682,7 @@ error_close_devices:
btrfs_close_devices(fs_devices);
error_free_subvol_name:
kfree(subvol_name);
error:
return error;
}
@ -624,14 +727,37 @@ static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf)
{
struct btrfs_root *root = btrfs_sb(dentry->d_sb);
struct btrfs_super_block *disk_super = &root->fs_info->super_copy;
struct list_head *head = &root->fs_info->space_info;
struct btrfs_space_info *found;
u64 total_used = 0;
u64 data_used = 0;
int bits = dentry->d_sb->s_blocksize_bits;
__be32 *fsid = (__be32 *)root->fs_info->fsid;
rcu_read_lock();
list_for_each_entry_rcu(found, head, list) {
if (found->flags & (BTRFS_BLOCK_GROUP_DUP|
BTRFS_BLOCK_GROUP_RAID10|
BTRFS_BLOCK_GROUP_RAID1)) {
total_used += found->bytes_used;
if (found->flags & BTRFS_BLOCK_GROUP_DATA)
data_used += found->bytes_used;
else
data_used += found->total_bytes;
}
total_used += found->bytes_used;
if (found->flags & BTRFS_BLOCK_GROUP_DATA)
data_used += found->bytes_used;
else
data_used += found->total_bytes;
}
rcu_read_unlock();
buf->f_namelen = BTRFS_NAME_LEN;
buf->f_blocks = btrfs_super_total_bytes(disk_super) >> bits;
buf->f_bfree = buf->f_blocks -
(btrfs_super_bytes_used(disk_super) >> bits);
buf->f_bavail = buf->f_bfree;
buf->f_bfree = buf->f_blocks - (total_used >> bits);
buf->f_bavail = buf->f_blocks - (data_used >> bits);
buf->f_bsize = dentry->d_sb->s_blocksize;
buf->f_type = BTRFS_SUPER_MAGIC;

5
fs/btrfs/transaction.c
View File

@ -997,13 +997,10 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
mutex_unlock(&root->fs_info->trans_mutex);
if (flush_on_commit) {
if (flush_on_commit || snap_pending) {
btrfs_start_delalloc_inodes(root, 1);
ret = btrfs_wait_ordered_extents(root, 0, 1);
BUG_ON(ret);
} else if (snap_pending) {
ret = btrfs_wait_ordered_extents(root, 0, 1);
BUG_ON(ret);
}
/*

2
fs/btrfs/tree-log.c
View File

@ -445,7 +445,7 @@ static noinline struct inode *read_one_inode(struct btrfs_root *root,
key.objectid = objectid;
key.type = BTRFS_INODE_ITEM_KEY;
key.offset = 0;
inode = btrfs_iget(root->fs_info->sb, &key, root);
inode = btrfs_iget(root->fs_info->sb, &key, root, NULL);
if (IS_ERR(inode)) {
inode = NULL;
} else if (is_bad_inode(inode)) {

39
fs/btrfs/volumes.c
View File

@ -256,13 +256,13 @@ loop_lock:
wake_up(&fs_info->async_submit_wait);
BUG_ON(atomic_read(&cur->bi_cnt) == 0);
submit_bio(cur->bi_rw, cur);
num_run++;
batch_run++;
if (bio_rw_flagged(cur, BIO_RW_SYNCIO))
num_sync_run++;
submit_bio(cur->bi_rw, cur);
num_run++;
batch_run++;
if (need_resched()) {
if (num_sync_run) {
blk_run_backing_dev(bdi, NULL);
@ -325,16 +325,6 @@ loop_lock:
num_sync_run = 0;
blk_run_backing_dev(bdi, NULL);
}
cond_resched();
if (again)
goto loop;
spin_lock(&device->io_lock);
if (device->pending_bios.head || device->pending_sync_bios.head)
goto loop_lock;
spin_unlock(&device->io_lock);
/*
* IO has already been through a long path to get here. Checksumming,
* async helper threads, perhaps compression. We've done a pretty
@ -346,6 +336,16 @@ loop_lock:
* cared about found its way down here.
*/
blk_run_backing_dev(bdi, NULL);
cond_resched();
if (again)
goto loop;
spin_lock(&device->io_lock);
if (device->pending_bios.head || device->pending_sync_bios.head)
goto loop_lock;
spin_unlock(&device->io_lock);
done:
return 0;
}
@ -365,6 +365,7 @@ static noinline int device_list_add(const char *path,
struct btrfs_device *device;
struct btrfs_fs_devices *fs_devices;
u64 found_transid = btrfs_super_generation(disk_super);
char *name;
fs_devices = find_fsid(disk_super->fsid);
if (!fs_devices) {
@ -411,6 +412,12 @@ static noinline int device_list_add(const char *path,
device->fs_devices = fs_devices;
fs_devices->num_devices++;
} else if (strcmp(device->name, path)) {
name = kstrdup(path, GFP_NOFS);
if (!name)
return -ENOMEM;
kfree(device->name);
device->name = name;
}
if (found_transid > fs_devices->latest_trans) {
@ -592,7 +599,7 @@ static int __btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
goto error_close;
disk_super = (struct btrfs_super_block *)bh->b_data;
devid = le64_to_cpu(disk_super->dev_item.devid);
devid = btrfs_stack_device_id(&disk_super->dev_item);
if (devid != device->devid)
goto error_brelse;
@ -694,7 +701,7 @@ int btrfs_scan_one_device(const char *path, fmode_t flags, void *holder,
goto error_close;
}
disk_super = (struct btrfs_super_block *)bh->b_data;
devid = le64_to_cpu(disk_super->dev_item.devid);
devid = btrfs_stack_device_id(&disk_super->dev_item);
transid = btrfs_super_generation(disk_super);
if (disk_super->label[0])
printk(KERN_INFO "device label %s ", disk_super->label);
@ -1187,7 +1194,7 @@ int btrfs_rm_device(struct btrfs_root *root, char *device_path)
goto error_close;
}
disk_super = (struct btrfs_super_block *)bh->b_data;
devid = le64_to_cpu(disk_super->dev_item.devid);
devid = btrfs_stack_device_id(&disk_super->dev_item);
dev_uuid = disk_super->dev_item.uuid;
device = btrfs_find_device(root, devid, dev_uuid,
disk_super->fsid);