xfs: ensure that single-owner file blocks are not owned by others

For any file fork mapping that can only have a single owner, make sure
that there are no other rmap owners for that mapping.  This patch
requires the more detailed checking provided by xfs_rmap_count_owners so
that we can know how many rmap records for a given range of space had a
matching owner, how many had a non-matching owner, and how many
conflicted with the records that have a matching owner.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Dave Chinner <dchinner@redhat.com>

diff --git a/fs/xfs/scrub/bmap.c b/fs/xfs/scrub/bmap.c
index be2c4da..2412dcf 100644 (file)
--- a/fs/xfs/scrub/bmap.c
+++ b/fs/xfs/scrub/bmap.c
@@ -308,6 +308,7 @@ xchk_bmap_iextent_xref(
        struct xchk_bmap_info   *info,
        struct xfs_bmbt_irec    *irec)
 {
+       struct xfs_owner_info   oinfo;
        struct xfs_mount        *mp = info->sc->mp;
        xfs_agnumber_t          agno;
        xfs_agblock_t           agbno;
@@ -328,19 +329,30 @@ xchk_bmap_iextent_xref(
        xchk_bmap_xref_rmap(info, irec, agbno);
        switch (info->whichfork) {
        case XFS_DATA_FORK:
-               if (!xfs_is_reflink_inode(info->sc->ip))
+               if (!xfs_is_reflink_inode(info->sc->ip)) {
+                       xfs_rmap_ino_owner(&oinfo, info->sc->ip->i_ino,
+                                       info->whichfork, irec->br_startoff);
+                       xchk_xref_is_only_owned_by(info->sc, agbno,
+                                       irec->br_blockcount, &oinfo);
                        xchk_xref_is_not_shared(info->sc, agbno,
                                        irec->br_blockcount);
+               }
                xchk_xref_is_not_cow_staging(info->sc, agbno,
                                irec->br_blockcount);
                break;
        case XFS_ATTR_FORK:
+               xfs_rmap_ino_owner(&oinfo, info->sc->ip->i_ino,
+                               info->whichfork, irec->br_startoff);
+               xchk_xref_is_only_owned_by(info->sc, agbno, irec->br_blockcount,
+                               &oinfo);
                xchk_xref_is_not_shared(info->sc, agbno,
                                irec->br_blockcount);
                xchk_xref_is_not_cow_staging(info->sc, agbno,
                                irec->br_blockcount);
                break;
        case XFS_COW_FORK:
+               xchk_xref_is_only_owned_by(info->sc, agbno, irec->br_blockcount,
+                               &XFS_RMAP_OINFO_COW);
                xchk_xref_is_cow_staging(info->sc, agbno,
                                irec->br_blockcount);
                xchk_xref_is_not_shared(info->sc, agbno,