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-rw-r--r--fs/xfs/scrub/rtbitmap.c157
1 files changed, 157 insertions, 0 deletions
diff --git a/fs/xfs/scrub/rtbitmap.c b/fs/xfs/scrub/rtbitmap.c
new file mode 100644
index 0000000000..008ddb599e
--- /dev/null
+++ b/fs/xfs/scrub/rtbitmap.c
@@ -0,0 +1,157 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2017-2023 Oracle. All Rights Reserved.
+ * Author: Darrick J. Wong <djwong@kernel.org>
+ */
+#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_log_format.h"
+#include "xfs_trans.h"
+#include "xfs_rtalloc.h"
+#include "xfs_inode.h"
+#include "xfs_bmap.h"
+#include "scrub/scrub.h"
+#include "scrub/common.h"
+
+/* Set us up with the realtime metadata locked. */
+int
+xchk_setup_rtbitmap(
+ struct xfs_scrub *sc)
+{
+ int error;
+
+ error = xchk_trans_alloc(sc, 0);
+ if (error)
+ return error;
+
+ error = xchk_install_live_inode(sc, sc->mp->m_rbmip);
+ if (error)
+ return error;
+
+ xchk_ilock(sc, XFS_ILOCK_EXCL | XFS_ILOCK_RTBITMAP);
+ return 0;
+}
+
+/* Realtime bitmap. */
+
+/* Scrub a free extent record from the realtime bitmap. */
+STATIC int
+xchk_rtbitmap_rec(
+ struct xfs_mount *mp,
+ struct xfs_trans *tp,
+ const struct xfs_rtalloc_rec *rec,
+ void *priv)
+{
+ struct xfs_scrub *sc = priv;
+ xfs_rtblock_t startblock;
+ xfs_rtblock_t blockcount;
+
+ startblock = rec->ar_startext * mp->m_sb.sb_rextsize;
+ blockcount = rec->ar_extcount * mp->m_sb.sb_rextsize;
+
+ if (!xfs_verify_rtext(mp, startblock, blockcount))
+ xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, 0);
+ return 0;
+}
+
+/* Make sure the entire rtbitmap file is mapped with written extents. */
+STATIC int
+xchk_rtbitmap_check_extents(
+ struct xfs_scrub *sc)
+{
+ struct xfs_mount *mp = sc->mp;
+ struct xfs_bmbt_irec map;
+ xfs_rtblock_t off;
+ int nmap;
+ int error = 0;
+
+ for (off = 0; off < mp->m_sb.sb_rbmblocks;) {
+ if (xchk_should_terminate(sc, &error) ||
+ (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT))
+ break;
+
+ /* Make sure we have a written extent. */
+ nmap = 1;
+ error = xfs_bmapi_read(mp->m_rbmip, off,
+ mp->m_sb.sb_rbmblocks - off, &map, &nmap,
+ XFS_DATA_FORK);
+ if (!xchk_fblock_process_error(sc, XFS_DATA_FORK, off, &error))
+ break;
+
+ if (nmap != 1 || !xfs_bmap_is_written_extent(&map)) {
+ xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, off);
+ break;
+ }
+
+ off += map.br_blockcount;
+ }
+
+ return error;
+}
+
+/* Scrub the realtime bitmap. */
+int
+xchk_rtbitmap(
+ struct xfs_scrub *sc)
+{
+ int error;
+
+ /* Is the size of the rtbitmap correct? */
+ if (sc->mp->m_rbmip->i_disk_size !=
+ XFS_FSB_TO_B(sc->mp, sc->mp->m_sb.sb_rbmblocks)) {
+ xchk_ino_set_corrupt(sc, sc->mp->m_rbmip->i_ino);
+ return 0;
+ }
+
+ /* Invoke the fork scrubber. */
+ error = xchk_metadata_inode_forks(sc);
+ if (error || (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT))
+ return error;
+
+ error = xchk_rtbitmap_check_extents(sc);
+ if (error || (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT))
+ return error;
+
+ error = xfs_rtalloc_query_all(sc->mp, sc->tp, xchk_rtbitmap_rec, sc);
+ if (!xchk_fblock_process_error(sc, XFS_DATA_FORK, 0, &error))
+ goto out;
+
+out:
+ 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);
+ do_div(endext, sc->mp->m_sb.sb_rextsize);
+ extcount = endext - startext + 1;
+ 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);
+}