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authorMiao Xie <miaox@cn.fujitsu.com>2012-11-28 10:28:54 +0000
committerChris Mason <chris.mason@fusionio.com>2012-12-16 20:46:15 -0500
commit0ff6fabdb0a862b22df4dd75873578392478e64d (patch)
treecc9766f343a57433232b6cbc0aab8f04024850a8 /fs/btrfs
parent797f4277113bff142b6c64a55abaef64d7d67d5c (diff)
downloadblackbird-op-linux-0ff6fabdb0a862b22df4dd75873578392478e64d.tar.gz
blackbird-op-linux-0ff6fabdb0a862b22df4dd75873578392478e64d.zip
Btrfs: fix off-by-one error of the reserved size of btrfs_allocate()
alloc_end is not the real end of the current extent, it is the start of the next adjoining extent. So we needn't +1 when calculating the size the space that is about to be reserved. Signed-off-by: Miao Xie <miaox@cn.fujitsu.com> Reviewed-by: Liu Bo <bo.li.liu@oracle.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
Diffstat (limited to 'fs/btrfs')
-rw-r--r--fs/btrfs/file.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index a43d0aef6ee1..8e3d6788d6dd 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -2072,7 +2072,7 @@ static long btrfs_fallocate(struct file *file, int mode,
* Make sure we have enough space before we do the
* allocation.
*/
- ret = btrfs_check_data_free_space(inode, alloc_end - alloc_start + 1);
+ ret = btrfs_check_data_free_space(inode, alloc_end - alloc_start);
if (ret)
return ret;
@@ -2179,7 +2179,7 @@ static long btrfs_fallocate(struct file *file, int mode,
out:
mutex_unlock(&inode->i_mutex);
/* Let go of our reservation. */
- btrfs_free_reserved_data_space(inode, alloc_end - alloc_start + 1);
+ btrfs_free_reserved_data_space(inode, alloc_end - alloc_start);
return ret;
}
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