Commit 2b0eeb5e authored Aug 03, 2016 by Darrick J. Wong Committed by Dave Chinner Aug 03, 2016

xfs: disable XFS_IOC_SWAPEXT when rmap btree is enabled



Swapping extents between two inodes requires the owner to be updated
in the rmap tree for all the extents that are swapped. This code
does not yet exist, so switch off the XFS_IOC_SWAPEXT ioctl until
support has been implemented. This will need to be done before the
rmap btree code can have the experimental tag removed.

This functionality will be provided in a (much) later patch, using
some of the reflink deferred block remapping functionality to
accomlish extent swapping with rmap updates.

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

parent a650e8f9

fs/xfs/xfs_bmap_util.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -1535,6 +1535,10 @@ xfs_swap_extents(
		__uint64_t tmp;
		int lock_flags;

		/* XXX: we can't do this with rmap, will fix later */
		if (xfs_sb_version_hasrmapbt(&mp->m_sb))
		return -EOPNOTSUPP;

		tempifp = kmem_alloc(sizeof(xfs_ifork_t), KM_MAYFAIL);
		if (!tempifp) {
		error = -ENOMEM;

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