v4.19.13 snapshot.
diff --git a/fs/xfs/scrub/rtbitmap.c b/fs/xfs/scrub/rtbitmap.c
new file mode 100644
index 0000000..665d4bb
--- /dev/null
+++ b/fs/xfs/scrub/rtbitmap.c
@@ -0,0 +1,156 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2017 Oracle. All Rights Reserved.
+ * Author: Darrick J. Wong <darrick.wong@oracle.com>
+ */
+#include "xfs.h"
+#include "xfs_fs.h"
+#include "xfs_shared.h"
+#include "xfs_format.h"
+#include "xfs_trans_resv.h"
+#include "xfs_mount.h"
+#include "xfs_defer.h"
+#include "xfs_btree.h"
+#include "xfs_bit.h"
+#include "xfs_log_format.h"
+#include "xfs_trans.h"
+#include "xfs_sb.h"
+#include "xfs_alloc.h"
+#include "xfs_rtalloc.h"
+#include "xfs_inode.h"
+#include "scrub/xfs_scrub.h"
+#include "scrub/scrub.h"
+#include "scrub/common.h"
+#include "scrub/trace.h"
+
+/* Set us up with the realtime metadata locked. */
+int
+xchk_setup_rt(
+ struct xfs_scrub *sc,
+ struct xfs_inode *ip)
+{
+ int error;
+
+ error = xchk_setup_fs(sc, ip);
+ if (error)
+ return error;
+
+ sc->ilock_flags = XFS_ILOCK_EXCL | XFS_ILOCK_RTBITMAP;
+ sc->ip = sc->mp->m_rbmip;
+ xfs_ilock(sc->ip, sc->ilock_flags);
+
+ return 0;
+}
+
+/* Realtime bitmap. */
+
+/* Scrub a free extent record from the realtime bitmap. */
+STATIC int
+xchk_rtbitmap_rec(
+ struct xfs_trans *tp,
+ struct xfs_rtalloc_rec *rec,
+ void *priv)
+{
+ struct xfs_scrub *sc = priv;
+ xfs_rtblock_t startblock;
+ xfs_rtblock_t blockcount;
+
+ startblock = rec->ar_startext * tp->t_mountp->m_sb.sb_rextsize;
+ blockcount = rec->ar_extcount * tp->t_mountp->m_sb.sb_rextsize;
+
+ if (startblock + blockcount <= startblock ||
+ !xfs_verify_rtbno(sc->mp, startblock) ||
+ !xfs_verify_rtbno(sc->mp, startblock + blockcount - 1))
+ xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, 0);
+ return 0;
+}
+
+/* Scrub the realtime bitmap. */
+int
+xchk_rtbitmap(
+ struct xfs_scrub *sc)
+{
+ int error;
+
+ /* Invoke the fork scrubber. */
+ error = xchk_metadata_inode_forks(sc);
+ if (error || (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT))
+ return error;
+
+ error = xfs_rtalloc_query_all(sc->tp, xchk_rtbitmap_rec, sc);
+ if (!xchk_fblock_process_error(sc, XFS_DATA_FORK, 0, &error))
+ goto out;
+
+out:
+ return error;
+}
+
+/* Scrub the realtime summary. */
+int
+xchk_rtsummary(
+ struct xfs_scrub *sc)
+{
+ struct xfs_inode *rsumip = sc->mp->m_rsumip;
+ struct xfs_inode *old_ip = sc->ip;
+ uint old_ilock_flags = sc->ilock_flags;
+ int error = 0;
+
+ /*
+ * We ILOCK'd the rt bitmap ip in the setup routine, now lock the
+ * rt summary ip in compliance with the rt inode locking rules.
+ *
+ * Since we switch sc->ip to rsumip we have to save the old ilock
+ * flags so that we don't mix up the inode state that @sc tracks.
+ */
+ sc->ip = rsumip;
+ sc->ilock_flags = XFS_ILOCK_EXCL | XFS_ILOCK_RTSUM;
+ xfs_ilock(sc->ip, sc->ilock_flags);
+
+ /* Invoke the fork scrubber. */
+ error = xchk_metadata_inode_forks(sc);
+ if (error || (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT))
+ goto out;
+
+ /* XXX: implement this some day */
+ xchk_set_incomplete(sc);
+out:
+ /* Switch back to the rtbitmap inode and lock flags. */
+ xfs_iunlock(sc->ip, sc->ilock_flags);
+ sc->ilock_flags = old_ilock_flags;
+ sc->ip = old_ip;
+ return error;
+}
+
+
+/* xref check that the extent is not free in the rtbitmap */
+void
+xchk_xref_is_used_rt_space(
+ struct xfs_scrub *sc,
+ xfs_rtblock_t fsbno,
+ xfs_extlen_t len)
+{
+ xfs_rtblock_t startext;
+ xfs_rtblock_t endext;
+ xfs_rtblock_t extcount;
+ bool is_free;
+ int error;
+
+ if (xchk_skip_xref(sc->sm))
+ return;
+
+ startext = fsbno;
+ endext = fsbno + len - 1;
+ do_div(startext, sc->mp->m_sb.sb_rextsize);
+ if (do_div(endext, sc->mp->m_sb.sb_rextsize))
+ endext++;
+ extcount = endext - startext;
+ xfs_ilock(sc->mp->m_rbmip, XFS_ILOCK_SHARED | XFS_ILOCK_RTBITMAP);
+ error = xfs_rtalloc_extent_is_free(sc->mp, sc->tp, startext, extcount,
+ &is_free);
+ if (!xchk_should_check_xref(sc, &error, NULL))
+ goto out_unlock;
+ if (is_free)
+ xchk_ino_xref_set_corrupt(sc, sc->mp->m_rbmip->i_ino);
+out_unlock:
+ xfs_iunlock(sc->mp->m_rbmip, XFS_ILOCK_SHARED | XFS_ILOCK_RTBITMAP);
+}