xfs: cross-reference reverse-mapping btree
When scrubbing various btrees, we should cross-reference the records
with the reverse mapping btree and ensure that traversing the btree
finds the same number of blocks that the rmapbt thinks are owned by
that btree.
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
diff --git a/fs/xfs/scrub/rmap.c b/fs/xfs/scrub/rmap.c
index 6e937ef..3ee5061 100644
--- a/fs/xfs/scrub/rmap.c
+++ b/fs/xfs/scrub/rmap.c
@@ -157,3 +157,68 @@ xfs_scrub_rmapbt(
return xfs_scrub_btree(sc, sc->sa.rmap_cur, xfs_scrub_rmapbt_rec,
&oinfo, NULL);
}
+
+/* xref check that the extent is owned by a given owner */
+static inline void
+xfs_scrub_xref_check_owner(
+ struct xfs_scrub_context *sc,
+ xfs_agblock_t bno,
+ xfs_extlen_t len,
+ struct xfs_owner_info *oinfo,
+ bool should_have_rmap)
+{
+ bool has_rmap;
+ int error;
+
+ if (!sc->sa.rmap_cur)
+ return;
+
+ error = xfs_rmap_record_exists(sc->sa.rmap_cur, bno, len, oinfo,
+ &has_rmap);
+ if (!xfs_scrub_should_check_xref(sc, &error, &sc->sa.rmap_cur))
+ return;
+ if (has_rmap != should_have_rmap)
+ xfs_scrub_btree_xref_set_corrupt(sc, sc->sa.rmap_cur, 0);
+}
+
+/* xref check that the extent is owned by a given owner */
+void
+xfs_scrub_xref_is_owned_by(
+ struct xfs_scrub_context *sc,
+ xfs_agblock_t bno,
+ xfs_extlen_t len,
+ struct xfs_owner_info *oinfo)
+{
+ xfs_scrub_xref_check_owner(sc, bno, len, oinfo, true);
+}
+
+/* xref check that the extent is not owned by a given owner */
+void
+xfs_scrub_xref_is_not_owned_by(
+ struct xfs_scrub_context *sc,
+ xfs_agblock_t bno,
+ xfs_extlen_t len,
+ struct xfs_owner_info *oinfo)
+{
+ xfs_scrub_xref_check_owner(sc, bno, len, oinfo, false);
+}
+
+/* xref check that the extent has no reverse mapping at all */
+void
+xfs_scrub_xref_has_no_owner(
+ struct xfs_scrub_context *sc,
+ xfs_agblock_t bno,
+ xfs_extlen_t len)
+{
+ bool has_rmap;
+ int error;
+
+ if (!sc->sa.rmap_cur)
+ return;
+
+ error = xfs_rmap_has_record(sc->sa.rmap_cur, bno, len, &has_rmap);
+ if (!xfs_scrub_should_check_xref(sc, &error, &sc->sa.rmap_cur))
+ return;
+ if (has_rmap)
+ xfs_scrub_btree_xref_set_corrupt(sc, sc->sa.rmap_cur, 0);
+}