Btrfs: truncate: don't update inode->i_blocks when extent is a hole
I think check whether extent is a hole before update 'inode->i_blocks'
is unconditional required. (original codes check it only when
del_item isn't equal to 0)
Signed-off-by: Chris Mason <chris.mason@oracle.com>
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 192fdda..43bf433 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -595,6 +595,7 @@
btrfs_file_extent_type(fi) !=
BTRFS_FILE_EXTENT_INLINE) {
u64 num_dec;
+ extent_start = btrfs_file_extent_disk_blocknr(fi);
if (!del_item) {
u64 orig_num_blocks =
btrfs_file_extent_num_blocks(fi);
@@ -604,12 +605,13 @@
extent_num_blocks >>= inode->i_blkbits;
btrfs_set_file_extent_num_blocks(fi,
extent_num_blocks);
- inode->i_blocks -= (orig_num_blocks -
- extent_num_blocks) << 3;
+ num_dec = (orig_num_blocks -
+ extent_num_blocks) << 3;
+ if (extent_start != 0) {
+ inode->i_blocks -= num_dec;
+ }
btrfs_mark_buffer_dirty(path->nodes[0]);
} else {
- extent_start =
- btrfs_file_extent_disk_blocknr(fi);
extent_num_blocks =
btrfs_file_extent_disk_num_blocks(fi);
/* FIXME blocksize != 4096 */