Commit fba3e594 authored Nov 28, 2016 by Darrick J. Wong Committed by Dave Chinner Nov 28, 2016

xfs: always succeed when deduping zero bytes



It turns out that btrfs and xfs had differing interpretations of what
to do when the dedupe length is zero.  Change xfs to follow btrfs'
semantics so that the userland interface is consistent.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>

parent cf7841c1

fs/xfs/xfs_reflink.c

+7 −1

Original line number	Diff line number	Diff line
		@@ -1317,8 +1317,14 @@ xfs_reflink_remap_range(
		goto out_unlock;
		}

		if (len == 0)
		/* Zero length dedupe exits immediately; reflink goes to EOF. */
		if (len == 0) {
		if (is_dedupe) {
		ret = 0;
		goto out_unlock;
		}
		len = isize - pos_in;
		}

		/* Ensure offsets don't wrap and the input is inside i_size */
		if (pos_in + len < pos_in \|\| pos_out + len < pos_out \|\|