mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-06 02:24:14 +08:00
6db7531882
While struct qstr is more natural without fscrypt, since it's provided by dentries, struct fscrypt_str is provided by the fscrypt handlers processing dentries, and is thus more natural in the fscrypt world. Replace all of the struct qstr uses with struct fscrypt_str. Signed-off-by: Sweet Tea Dorminy <sweettea-kernel@dorminy.me> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
753 lines
20 KiB
C
753 lines
20 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Copyright (C) 2007 Oracle. All rights reserved.
|
|
*/
|
|
|
|
#include "ctree.h"
|
|
#include "fs.h"
|
|
#include "messages.h"
|
|
#include "inode-item.h"
|
|
#include "disk-io.h"
|
|
#include "transaction.h"
|
|
#include "print-tree.h"
|
|
#include "space-info.h"
|
|
#include "accessors.h"
|
|
|
|
struct btrfs_inode_ref *btrfs_find_name_in_backref(struct extent_buffer *leaf,
|
|
int slot,
|
|
const struct fscrypt_str *name)
|
|
{
|
|
struct btrfs_inode_ref *ref;
|
|
unsigned long ptr;
|
|
unsigned long name_ptr;
|
|
u32 item_size;
|
|
u32 cur_offset = 0;
|
|
int len;
|
|
|
|
item_size = btrfs_item_size(leaf, slot);
|
|
ptr = btrfs_item_ptr_offset(leaf, slot);
|
|
while (cur_offset < item_size) {
|
|
ref = (struct btrfs_inode_ref *)(ptr + cur_offset);
|
|
len = btrfs_inode_ref_name_len(leaf, ref);
|
|
name_ptr = (unsigned long)(ref + 1);
|
|
cur_offset += len + sizeof(*ref);
|
|
if (len != name->len)
|
|
continue;
|
|
if (memcmp_extent_buffer(leaf, name->name, name_ptr,
|
|
name->len) == 0)
|
|
return ref;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
struct btrfs_inode_extref *btrfs_find_name_in_ext_backref(
|
|
struct extent_buffer *leaf, int slot, u64 ref_objectid,
|
|
const struct fscrypt_str *name)
|
|
{
|
|
struct btrfs_inode_extref *extref;
|
|
unsigned long ptr;
|
|
unsigned long name_ptr;
|
|
u32 item_size;
|
|
u32 cur_offset = 0;
|
|
int ref_name_len;
|
|
|
|
item_size = btrfs_item_size(leaf, slot);
|
|
ptr = btrfs_item_ptr_offset(leaf, slot);
|
|
|
|
/*
|
|
* Search all extended backrefs in this item. We're only
|
|
* looking through any collisions so most of the time this is
|
|
* just going to compare against one buffer. If all is well,
|
|
* we'll return success and the inode ref object.
|
|
*/
|
|
while (cur_offset < item_size) {
|
|
extref = (struct btrfs_inode_extref *) (ptr + cur_offset);
|
|
name_ptr = (unsigned long)(&extref->name);
|
|
ref_name_len = btrfs_inode_extref_name_len(leaf, extref);
|
|
|
|
if (ref_name_len == name->len &&
|
|
btrfs_inode_extref_parent(leaf, extref) == ref_objectid &&
|
|
(memcmp_extent_buffer(leaf, name->name, name_ptr,
|
|
name->len) == 0))
|
|
return extref;
|
|
|
|
cur_offset += ref_name_len + sizeof(*extref);
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
/* Returns NULL if no extref found */
|
|
struct btrfs_inode_extref *
|
|
btrfs_lookup_inode_extref(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root,
|
|
struct btrfs_path *path,
|
|
const struct fscrypt_str *name,
|
|
u64 inode_objectid, u64 ref_objectid, int ins_len,
|
|
int cow)
|
|
{
|
|
int ret;
|
|
struct btrfs_key key;
|
|
|
|
key.objectid = inode_objectid;
|
|
key.type = BTRFS_INODE_EXTREF_KEY;
|
|
key.offset = btrfs_extref_hash(ref_objectid, name->name, name->len);
|
|
|
|
ret = btrfs_search_slot(trans, root, &key, path, ins_len, cow);
|
|
if (ret < 0)
|
|
return ERR_PTR(ret);
|
|
if (ret > 0)
|
|
return NULL;
|
|
return btrfs_find_name_in_ext_backref(path->nodes[0], path->slots[0],
|
|
ref_objectid, name);
|
|
|
|
}
|
|
|
|
static int btrfs_del_inode_extref(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root,
|
|
const struct fscrypt_str *name,
|
|
u64 inode_objectid, u64 ref_objectid,
|
|
u64 *index)
|
|
{
|
|
struct btrfs_path *path;
|
|
struct btrfs_key key;
|
|
struct btrfs_inode_extref *extref;
|
|
struct extent_buffer *leaf;
|
|
int ret;
|
|
int del_len = name->len + sizeof(*extref);
|
|
unsigned long ptr;
|
|
unsigned long item_start;
|
|
u32 item_size;
|
|
|
|
key.objectid = inode_objectid;
|
|
key.type = BTRFS_INODE_EXTREF_KEY;
|
|
key.offset = btrfs_extref_hash(ref_objectid, name->name, name->len);
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
|
|
ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
|
|
if (ret > 0)
|
|
ret = -ENOENT;
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
/*
|
|
* Sanity check - did we find the right item for this name?
|
|
* This should always succeed so error here will make the FS
|
|
* readonly.
|
|
*/
|
|
extref = btrfs_find_name_in_ext_backref(path->nodes[0], path->slots[0],
|
|
ref_objectid, name);
|
|
if (!extref) {
|
|
btrfs_handle_fs_error(root->fs_info, -ENOENT, NULL);
|
|
ret = -EROFS;
|
|
goto out;
|
|
}
|
|
|
|
leaf = path->nodes[0];
|
|
item_size = btrfs_item_size(leaf, path->slots[0]);
|
|
if (index)
|
|
*index = btrfs_inode_extref_index(leaf, extref);
|
|
|
|
if (del_len == item_size) {
|
|
/*
|
|
* Common case only one ref in the item, remove the
|
|
* whole item.
|
|
*/
|
|
ret = btrfs_del_item(trans, root, path);
|
|
goto out;
|
|
}
|
|
|
|
ptr = (unsigned long)extref;
|
|
item_start = btrfs_item_ptr_offset(leaf, path->slots[0]);
|
|
|
|
memmove_extent_buffer(leaf, ptr, ptr + del_len,
|
|
item_size - (ptr + del_len - item_start));
|
|
|
|
btrfs_truncate_item(path, item_size - del_len, 1);
|
|
|
|
out:
|
|
btrfs_free_path(path);
|
|
|
|
return ret;
|
|
}
|
|
|
|
int btrfs_del_inode_ref(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root, const struct fscrypt_str *name,
|
|
u64 inode_objectid, u64 ref_objectid, u64 *index)
|
|
{
|
|
struct btrfs_path *path;
|
|
struct btrfs_key key;
|
|
struct btrfs_inode_ref *ref;
|
|
struct extent_buffer *leaf;
|
|
unsigned long ptr;
|
|
unsigned long item_start;
|
|
u32 item_size;
|
|
u32 sub_item_len;
|
|
int ret;
|
|
int search_ext_refs = 0;
|
|
int del_len = name->len + sizeof(*ref);
|
|
|
|
key.objectid = inode_objectid;
|
|
key.offset = ref_objectid;
|
|
key.type = BTRFS_INODE_REF_KEY;
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
|
|
ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
|
|
if (ret > 0) {
|
|
ret = -ENOENT;
|
|
search_ext_refs = 1;
|
|
goto out;
|
|
} else if (ret < 0) {
|
|
goto out;
|
|
}
|
|
|
|
ref = btrfs_find_name_in_backref(path->nodes[0], path->slots[0], name);
|
|
if (!ref) {
|
|
ret = -ENOENT;
|
|
search_ext_refs = 1;
|
|
goto out;
|
|
}
|
|
leaf = path->nodes[0];
|
|
item_size = btrfs_item_size(leaf, path->slots[0]);
|
|
|
|
if (index)
|
|
*index = btrfs_inode_ref_index(leaf, ref);
|
|
|
|
if (del_len == item_size) {
|
|
ret = btrfs_del_item(trans, root, path);
|
|
goto out;
|
|
}
|
|
ptr = (unsigned long)ref;
|
|
sub_item_len = name->len + sizeof(*ref);
|
|
item_start = btrfs_item_ptr_offset(leaf, path->slots[0]);
|
|
memmove_extent_buffer(leaf, ptr, ptr + sub_item_len,
|
|
item_size - (ptr + sub_item_len - item_start));
|
|
btrfs_truncate_item(path, item_size - sub_item_len, 1);
|
|
out:
|
|
btrfs_free_path(path);
|
|
|
|
if (search_ext_refs) {
|
|
/*
|
|
* No refs were found, or we could not find the
|
|
* name in our ref array. Find and remove the extended
|
|
* inode ref then.
|
|
*/
|
|
return btrfs_del_inode_extref(trans, root, name,
|
|
inode_objectid, ref_objectid, index);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* btrfs_insert_inode_extref() - Inserts an extended inode ref into a tree.
|
|
*
|
|
* The caller must have checked against BTRFS_LINK_MAX already.
|
|
*/
|
|
static int btrfs_insert_inode_extref(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root,
|
|
const struct fscrypt_str *name,
|
|
u64 inode_objectid, u64 ref_objectid,
|
|
u64 index)
|
|
{
|
|
struct btrfs_inode_extref *extref;
|
|
int ret;
|
|
int ins_len = name->len + sizeof(*extref);
|
|
unsigned long ptr;
|
|
struct btrfs_path *path;
|
|
struct btrfs_key key;
|
|
struct extent_buffer *leaf;
|
|
|
|
key.objectid = inode_objectid;
|
|
key.type = BTRFS_INODE_EXTREF_KEY;
|
|
key.offset = btrfs_extref_hash(ref_objectid, name->name, name->len);
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
|
|
ret = btrfs_insert_empty_item(trans, root, path, &key,
|
|
ins_len);
|
|
if (ret == -EEXIST) {
|
|
if (btrfs_find_name_in_ext_backref(path->nodes[0],
|
|
path->slots[0],
|
|
ref_objectid,
|
|
name))
|
|
goto out;
|
|
|
|
btrfs_extend_item(path, ins_len);
|
|
ret = 0;
|
|
}
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
leaf = path->nodes[0];
|
|
ptr = (unsigned long)btrfs_item_ptr(leaf, path->slots[0], char);
|
|
ptr += btrfs_item_size(leaf, path->slots[0]) - ins_len;
|
|
extref = (struct btrfs_inode_extref *)ptr;
|
|
|
|
btrfs_set_inode_extref_name_len(path->nodes[0], extref, name->len);
|
|
btrfs_set_inode_extref_index(path->nodes[0], extref, index);
|
|
btrfs_set_inode_extref_parent(path->nodes[0], extref, ref_objectid);
|
|
|
|
ptr = (unsigned long)&extref->name;
|
|
write_extent_buffer(path->nodes[0], name->name, ptr, name->len);
|
|
btrfs_mark_buffer_dirty(path->nodes[0]);
|
|
|
|
out:
|
|
btrfs_free_path(path);
|
|
return ret;
|
|
}
|
|
|
|
/* Will return 0, -ENOMEM, -EMLINK, or -EEXIST or anything from the CoW path */
|
|
int btrfs_insert_inode_ref(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root, const struct fscrypt_str *name,
|
|
u64 inode_objectid, u64 ref_objectid, u64 index)
|
|
{
|
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
|
struct btrfs_path *path;
|
|
struct btrfs_key key;
|
|
struct btrfs_inode_ref *ref;
|
|
unsigned long ptr;
|
|
int ret;
|
|
int ins_len = name->len + sizeof(*ref);
|
|
|
|
key.objectid = inode_objectid;
|
|
key.offset = ref_objectid;
|
|
key.type = BTRFS_INODE_REF_KEY;
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
|
|
path->skip_release_on_error = 1;
|
|
ret = btrfs_insert_empty_item(trans, root, path, &key,
|
|
ins_len);
|
|
if (ret == -EEXIST) {
|
|
u32 old_size;
|
|
ref = btrfs_find_name_in_backref(path->nodes[0], path->slots[0],
|
|
name);
|
|
if (ref)
|
|
goto out;
|
|
|
|
old_size = btrfs_item_size(path->nodes[0], path->slots[0]);
|
|
btrfs_extend_item(path, ins_len);
|
|
ref = btrfs_item_ptr(path->nodes[0], path->slots[0],
|
|
struct btrfs_inode_ref);
|
|
ref = (struct btrfs_inode_ref *)((unsigned long)ref + old_size);
|
|
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);
|
|
ret = 0;
|
|
} else if (ret < 0) {
|
|
if (ret == -EOVERFLOW) {
|
|
if (btrfs_find_name_in_backref(path->nodes[0],
|
|
path->slots[0],
|
|
name))
|
|
ret = -EEXIST;
|
|
else
|
|
ret = -EMLINK;
|
|
}
|
|
goto out;
|
|
} else {
|
|
ref = btrfs_item_ptr(path->nodes[0], path->slots[0],
|
|
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->name, ptr, name->len);
|
|
btrfs_mark_buffer_dirty(path->nodes[0]);
|
|
|
|
out:
|
|
btrfs_free_path(path);
|
|
|
|
if (ret == -EMLINK) {
|
|
struct btrfs_super_block *disk_super = fs_info->super_copy;
|
|
/* We ran out of space in the ref array. Need to
|
|
* add an extended ref. */
|
|
if (btrfs_super_incompat_flags(disk_super)
|
|
& BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF)
|
|
ret = btrfs_insert_inode_extref(trans, root, name,
|
|
inode_objectid,
|
|
ref_objectid, index);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root,
|
|
struct btrfs_path *path, u64 objectid)
|
|
{
|
|
struct btrfs_key key;
|
|
int ret;
|
|
key.objectid = objectid;
|
|
key.type = BTRFS_INODE_ITEM_KEY;
|
|
key.offset = 0;
|
|
|
|
ret = btrfs_insert_empty_item(trans, root, path, &key,
|
|
sizeof(struct btrfs_inode_item));
|
|
return ret;
|
|
}
|
|
|
|
int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
|
|
*root, struct btrfs_path *path,
|
|
struct btrfs_key *location, int mod)
|
|
{
|
|
int ins_len = mod < 0 ? -1 : 0;
|
|
int cow = mod != 0;
|
|
int ret;
|
|
int slot;
|
|
struct extent_buffer *leaf;
|
|
struct btrfs_key found_key;
|
|
|
|
ret = btrfs_search_slot(trans, root, location, path, ins_len, cow);
|
|
if (ret > 0 && location->type == BTRFS_ROOT_ITEM_KEY &&
|
|
location->offset == (u64)-1 && path->slots[0] != 0) {
|
|
slot = path->slots[0] - 1;
|
|
leaf = path->nodes[0];
|
|
btrfs_item_key_to_cpu(leaf, &found_key, slot);
|
|
if (found_key.objectid == location->objectid &&
|
|
found_key.type == location->type) {
|
|
path->slots[0]--;
|
|
return 0;
|
|
}
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static inline void btrfs_trace_truncate(struct btrfs_inode *inode,
|
|
struct extent_buffer *leaf,
|
|
struct btrfs_file_extent_item *fi,
|
|
u64 offset, int extent_type, int slot)
|
|
{
|
|
if (!inode)
|
|
return;
|
|
if (extent_type == BTRFS_FILE_EXTENT_INLINE)
|
|
trace_btrfs_truncate_show_fi_inline(inode, leaf, fi, slot,
|
|
offset);
|
|
else
|
|
trace_btrfs_truncate_show_fi_regular(inode, leaf, fi, offset);
|
|
}
|
|
|
|
/*
|
|
* Remove inode items from a given root.
|
|
*
|
|
* @trans: A transaction handle.
|
|
* @root: The root from which to remove items.
|
|
* @inode: The inode whose items we want to remove.
|
|
* @control: The btrfs_truncate_control to control how and what we
|
|
* are truncating.
|
|
*
|
|
* Remove all keys associated with the inode from the given root that have a key
|
|
* with a type greater than or equals to @min_type. When @min_type has a value of
|
|
* BTRFS_EXTENT_DATA_KEY, only remove file extent items that have an offset value
|
|
* greater than or equals to @new_size. If a file extent item that starts before
|
|
* @new_size and ends after it is found, its length is adjusted.
|
|
*
|
|
* Returns: 0 on success, < 0 on error and NEED_TRUNCATE_BLOCK when @min_type is
|
|
* BTRFS_EXTENT_DATA_KEY and the caller must truncate the last block.
|
|
*/
|
|
int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root,
|
|
struct btrfs_truncate_control *control)
|
|
{
|
|
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 new_size = control->new_size;
|
|
u64 extent_num_bytes = 0;
|
|
u64 extent_offset = 0;
|
|
u64 item_end = 0;
|
|
u32 found_type = (u8)-1;
|
|
int del_item;
|
|
int pending_del_nr = 0;
|
|
int pending_del_slot = 0;
|
|
int extent_type = -1;
|
|
int ret;
|
|
u64 bytes_deleted = 0;
|
|
bool be_nice = false;
|
|
|
|
ASSERT(control->inode || !control->clear_extent_range);
|
|
ASSERT(new_size == 0 || control->min_type == BTRFS_EXTENT_DATA_KEY);
|
|
|
|
control->last_size = new_size;
|
|
control->sub_bytes = 0;
|
|
|
|
/*
|
|
* For shareable roots we want to back off from time to time, this turns
|
|
* out to be subvolume roots, reloc roots, and data reloc roots.
|
|
*/
|
|
if (test_bit(BTRFS_ROOT_SHAREABLE, &root->state))
|
|
be_nice = true;
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
path->reada = READA_BACK;
|
|
|
|
key.objectid = control->ino;
|
|
key.offset = (u64)-1;
|
|
key.type = (u8)-1;
|
|
|
|
search_again:
|
|
/*
|
|
* With a 16K leaf size and 128MiB 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 &&
|
|
btrfs_should_end_transaction(trans)) {
|
|
ret = -EAGAIN;
|
|
goto out;
|
|
}
|
|
|
|
ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
if (ret > 0) {
|
|
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) {
|
|
u64 clear_start = 0, clear_len = 0, extent_start = 0;
|
|
bool should_throttle = false;
|
|
|
|
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 != control->ino)
|
|
break;
|
|
|
|
if (found_type < control->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_ram_bytes(leaf, fi);
|
|
|
|
btrfs_trace_truncate(control->inode, leaf, fi,
|
|
found_key.offset, extent_type,
|
|
path->slots[0]);
|
|
item_end--;
|
|
}
|
|
if (found_type > control->min_type) {
|
|
del_item = 1;
|
|
} else {
|
|
if (item_end < new_size)
|
|
break;
|
|
if (found_key.offset >= new_size)
|
|
del_item = 1;
|
|
else
|
|
del_item = 0;
|
|
}
|
|
|
|
/* FIXME, shrink the extent if the ref count is only 1 */
|
|
if (found_type != BTRFS_EXTENT_DATA_KEY)
|
|
goto delete;
|
|
|
|
control->extents_found++;
|
|
|
|
if (extent_type != BTRFS_FILE_EXTENT_INLINE) {
|
|
u64 num_dec;
|
|
|
|
clear_start = found_key.offset;
|
|
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);
|
|
clear_start = ALIGN(new_size, fs_info->sectorsize);
|
|
|
|
btrfs_set_file_extent_num_bytes(leaf, fi,
|
|
extent_num_bytes);
|
|
num_dec = (orig_num_bytes - extent_num_bytes);
|
|
if (extent_start != 0)
|
|
control->sub_bytes += 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)
|
|
control->sub_bytes += num_dec;
|
|
}
|
|
clear_len = 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 &&
|
|
btrfs_file_extent_compression(leaf, fi) == 0) {
|
|
u32 size = (u32)(new_size - found_key.offset);
|
|
|
|
btrfs_set_file_extent_ram_bytes(leaf, fi, size);
|
|
size = btrfs_file_extent_calc_inline_size(size);
|
|
btrfs_truncate_item(path, size, 1);
|
|
} else if (!del_item) {
|
|
/*
|
|
* We have to bail so the last_size is set to
|
|
* just before this extent.
|
|
*/
|
|
ret = BTRFS_NEED_TRUNCATE_BLOCK;
|
|
break;
|
|
} else {
|
|
/*
|
|
* Inline extents are special, we just treat
|
|
* them as a full sector worth in the file
|
|
* extent tree just for simplicity sake.
|
|
*/
|
|
clear_len = fs_info->sectorsize;
|
|
}
|
|
|
|
control->sub_bytes += item_end + 1 - new_size;
|
|
}
|
|
delete:
|
|
/*
|
|
* We only want to clear the file extent range if we're
|
|
* modifying the actual inode's mapping, which is just the
|
|
* normal truncate path.
|
|
*/
|
|
if (control->clear_extent_range) {
|
|
ret = btrfs_inode_clear_file_extent_range(control->inode,
|
|
clear_start, clear_len);
|
|
if (ret) {
|
|
btrfs_abort_transaction(trans, ret);
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (del_item) {
|
|
ASSERT(!pending_del_nr ||
|
|
((path->slots[0] + 1) == pending_del_slot));
|
|
|
|
control->last_size = found_key.offset;
|
|
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 {
|
|
control->last_size = new_size;
|
|
break;
|
|
}
|
|
|
|
if (del_item && extent_start != 0 && !control->skip_ref_updates) {
|
|
struct btrfs_ref ref = { 0 };
|
|
|
|
bytes_deleted += extent_num_bytes;
|
|
|
|
btrfs_init_generic_ref(&ref, BTRFS_DROP_DELAYED_REF,
|
|
extent_start, extent_num_bytes, 0);
|
|
btrfs_init_data_ref(&ref, btrfs_header_owner(leaf),
|
|
control->ino, extent_offset,
|
|
root->root_key.objectid, false);
|
|
ret = btrfs_free_extent(trans, &ref);
|
|
if (ret) {
|
|
btrfs_abort_transaction(trans, ret);
|
|
break;
|
|
}
|
|
if (be_nice) {
|
|
if (btrfs_should_throttle_delayed_refs(trans))
|
|
should_throttle = true;
|
|
}
|
|
}
|
|
|
|
if (found_type == BTRFS_INODE_ITEM_KEY)
|
|
break;
|
|
|
|
if (path->slots[0] == 0 ||
|
|
path->slots[0] != pending_del_slot ||
|
|
should_throttle) {
|
|
if (pending_del_nr) {
|
|
ret = btrfs_del_items(trans, root, path,
|
|
pending_del_slot,
|
|
pending_del_nr);
|
|
if (ret) {
|
|
btrfs_abort_transaction(trans, ret);
|
|
break;
|
|
}
|
|
pending_del_nr = 0;
|
|
}
|
|
btrfs_release_path(path);
|
|
|
|
/*
|
|
* We can generate a lot of delayed refs, so we need to
|
|
* throttle every once and a while and make sure we're
|
|
* adding enough space to keep up with the work we are
|
|
* generating. Since we hold a transaction here we
|
|
* can't flush, and we don't want to FLUSH_LIMIT because
|
|
* we could have generated too many delayed refs to
|
|
* actually allocate, so just bail if we're short and
|
|
* let the normal reservation dance happen higher up.
|
|
*/
|
|
if (should_throttle) {
|
|
ret = btrfs_delayed_refs_rsv_refill(fs_info,
|
|
BTRFS_RESERVE_NO_FLUSH);
|
|
if (ret) {
|
|
ret = -EAGAIN;
|
|
break;
|
|
}
|
|
}
|
|
goto search_again;
|
|
} else {
|
|
path->slots[0]--;
|
|
}
|
|
}
|
|
out:
|
|
if (ret >= 0 && pending_del_nr) {
|
|
int err;
|
|
|
|
err = btrfs_del_items(trans, root, path, pending_del_slot,
|
|
pending_del_nr);
|
|
if (err) {
|
|
btrfs_abort_transaction(trans, err);
|
|
ret = err;
|
|
}
|
|
}
|
|
|
|
ASSERT(control->last_size >= new_size);
|
|
if (!ret && control->last_size > new_size)
|
|
control->last_size = new_size;
|
|
|
|
btrfs_free_path(path);
|
|
return ret;
|
|
}
|