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Btrfs: fix off-by-one error of the same page check in btrfs_punch_hole() 

(start + len) is the start of the adjacent extent, not the end of the current
extent, so we should not use it to check the hole is on the same page or not.

Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
This commit is contained in:
Miao Xie 2012-12-05 10:53:45 +00:00 committed by Chris Mason
parent 4b5829a8e3
commit 6347b3c433
1 changed files with 2 additions and 2 deletions
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4
fs/btrfs/file.c
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@ -1867,8 +1867,8 @@ static int btrfs_punch_hole(struct inode *inode, loff_t offset, loff_t len)
u64 drop_end;
int ret = 0;
int err = 0;
bool same_page = (offset >> PAGE_CACHE_SHIFT) ==
((offset + len) >> PAGE_CACHE_SHIFT);
bool same_page = ((offset >> PAGE_CACHE_SHIFT) ==
((offset + len - 1) >> PAGE_CACHE_SHIFT));
btrfs_wait_ordered_range(inode, offset, len);