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btrfs_drop_extents: make sure the item is getting smaller before truncate

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Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason 2007-11-30 10:09:33 -05:00
parent ca6646264b
commit 00f5c795fc
3 changed files with 25 additions and 17 deletions
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2
fs/btrfs/ctree.h
View file

@ -1037,7 +1037,7 @@ int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end);
extern struct file_operations btrfs_file_operations;
int btrfs_drop_extents(struct btrfs_trans_handle *trans,
struct btrfs_root *root, struct inode *inode,
u64 start, u64 end, u64 inline_end, u64 *hint_block);
u64 start, u64 end, u64 inline_limit, u64 *hint_block);
/* tree-defrag.c */
int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
struct btrfs_root *root, int cache_only);

8
fs/btrfs/extent-tree.c
View file

@ -45,6 +45,9 @@ static int cache_block_group(struct btrfs_root *root,
u64 first_free;
int found = 0;
if (!block_group)
return 0;
root = root->fs_info->extent_root;
free_space_cache = &root->fs_info->free_space_cache;
@ -168,6 +171,11 @@ static u64 find_search_start(struct btrfs_root *root,
u64 cache_miss = 0;
int wrapped = 0;
if (!cache) {
cache = btrfs_lookup_block_group(root->fs_info, search_start);
if (!cache)
return search_start;
}
again:
ret = cache_block_group(root, cache);
if (ret)

32
fs/btrfs/file.c
View file

@ -377,23 +377,23 @@ int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end)
*/
int btrfs_drop_extents(struct btrfs_trans_handle *trans,
struct btrfs_root *root, struct inode *inode,
u64 start, u64 end, u64 inline_end, u64 *hint_byte)
u64 start, u64 end, u64 inline_limit, u64 *hint_byte)
{
int ret;
struct btrfs_key key;
struct extent_buffer *leaf;
int slot;
struct btrfs_file_extent_item *extent;
u64 extent_end = 0;
int keep;
struct btrfs_file_extent_item old;
struct btrfs_path *path;
u64 search_start = start;
struct extent_buffer *leaf;
struct btrfs_file_extent_item *extent;
struct btrfs_path *path;
struct btrfs_key key;
struct btrfs_file_extent_item old;
int keep;
int slot;
int bookend;
int found_type;
int found_extent;
int found_inline;
int recow;
int ret;
btrfs_drop_extent_cache(inode, start, end - 1);
@ -502,7 +502,7 @@ next_slot:
}
bookend = 1;
if (found_inline && start <= key.offset &&
inline_end < extent_end)
inline_limit < extent_end)
keep = 1;
}
/* truncate existing extent */
@ -526,12 +526,12 @@ next_slot:
btrfs_set_file_extent_num_bytes(leaf, extent,
new_num);
btrfs_mark_buffer_dirty(leaf);
} else if (end > extent_end &&
key.offset < inline_end &&
inline_end < extent_end) {
} else if (key.offset < inline_limit &&
(end > extent_end) &&
(inline_limit < extent_end)) {
u32 new_size;
new_size = btrfs_file_extent_calc_inline_size(
inline_end - key.offset);
inline_limit - key.offset);
btrfs_truncate_item(trans, root, path,
new_size, 1);
}
@ -575,10 +575,10 @@ next_slot:
continue;
}
if (bookend && found_inline && start <= key.offset &&
inline_end < extent_end) {
inline_limit < extent_end && key.offset <= inline_limit) {
u32 new_size;
new_size = btrfs_file_extent_calc_inline_size(
extent_end - inline_end);
extent_end - inline_limit);
btrfs_truncate_item(trans, root, path, new_size, 0);
}
/* create bookend, splitting the extent in two */