Commit 207910dd authored Jun 30, 2015 by Mark Fasheh Committed by Chris Mason Jul 01, 2015

btrfs: pass unaligned length to btrfs_cmp_data()



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>

parent a89ca6f2

fs/btrfs/ioctl.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -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);