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btrfs: pass unaligned length to btrfs_cmp_data()

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In the case that we dedupe the tail of a file, we might expand the dedupe
len out to the end of our last block. We don't want to compare data past
i_size however, so pass the original length to btrfs_cmp_data().

Signed-off-by: Mark Fasheh <mfasheh@suse.de>
Reviewed-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Chris Mason <clm@fb.com>
This commit is contained in:
Mark Fasheh 2015-06-30 14:42:04 -07:00 committed by Chris Mason
parent a89ca6f24f
commit 207910ddee
1 changed files with 2 additions and 1 deletions
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3
fs/btrfs/ioctl.c
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@ -2943,7 +2943,8 @@ static int btrfs_extent_same(struct inode *src, u64 loff, u64 olen,
goto out_unlock;
}
ret = btrfs_cmp_data(src, loff, dst, dst_loff, len);
/* pass original length for comparison so we stay within i_size */
ret = btrfs_cmp_data(src, loff, dst, dst_loff, olen);
if (ret == 0)
ret = btrfs_clone(src, dst, loff, olen, len, dst_loff);