xfs: cross-reference chceks with the rt refcount btree

Use the realtime refcount btree to cross-reference other data
structures.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>

1 files changed, 66 insertions, 0 deletions

diff --git a/fs/xfs/scrub/rtrefcount.c b/fs/xfs/scrub/rtrefcount.c
index 21b74b9923de..ae0897b081ab 100644
--- a/fs/xfs/scrub/rtrefcount.c
+++ b/fs/xfs/scrub/rtrefcount.c
@@ -447,3 +447,69 @@ xchk_rtrefcountbt(
 out_unlock:
 	return error;
 }
+
+/* xref check that a cow staging extent is marked in the rtrefcountbt. */
+void
+xchk_xref_is_rt_cow_staging(
+	struct xfs_scrub		*sc,
+	xfs_rtblock_t			bno,
+	xfs_filblks_t			len)
+{
+	struct xfs_refcount_irec	rc;
+	bool				has_cowflag;
+	int				has_refcount;
+	int				error;
+
+	if (!sc->sr.refc_cur || xchk_skip_xref(sc->sm))
+		return;
+
+	/* Find the CoW staging extent. */
+	error = xfs_refcount_lookup_le(sc->sr.refc_cur,
+			bno + XFS_RTREFC_COW_START, &has_refcount);
+	if (!xchk_should_check_xref(sc, &error, &sc->sr.refc_cur))
+		return;
+	if (!has_refcount) {
+		xchk_btree_xref_set_corrupt(sc, sc->sr.refc_cur, 0);
+		return;
+	}
+
+	error = xfs_refcount_get_rec(sc->sr.refc_cur, &rc, &has_refcount);
+	if (!xchk_should_check_xref(sc, &error, &sc->sr.refc_cur))
+		return;
+	if (!has_refcount) {
+		xchk_btree_xref_set_corrupt(sc, sc->sr.refc_cur, 0);
+		return;
+	}
+
+	/* CoW flag must be set, refcount must be 1. */
+	has_cowflag = (rc.rc_startblock & XFS_RTREFC_COW_START);
+	if (!has_cowflag || rc.rc_refcount != 1)
+		xchk_btree_xref_set_corrupt(sc, sc->sr.refc_cur, 0);
+
+	/* Must be at least as long as what was passed in */
+	if (rc.rc_blockcount < len)
+		xchk_btree_xref_set_corrupt(sc, sc->sr.refc_cur, 0);
+}
+
+/*
+ * xref check that the extent is not shared.  Only file data blocks
+ * can have multiple owners.
+ */
+void
+xchk_xref_is_not_shared_rt(
+	struct xfs_scrub	*sc,
+	xfs_rtblock_t		bno,
+	xfs_filblks_t		len)
+{
+	bool			shared;
+	int			error;
+
+	if (!sc->sr.refc_cur || xchk_skip_xref(sc->sm))
+		return;
+
+	error = xfs_refcount_has_record(sc->sr.refc_cur, bno, len, &shared);
+	if (!xchk_should_check_xref(sc, &error, &sc->sr.refc_cur))
+		return;
+	if (shared)
+		xchk_btree_xref_set_corrupt(sc, sc->sr.refc_cur, 0);
+}