[PATCH 16/27] xfs: scrub rmap btrees

Darrick J. Wong
2017-09-21T00:19:17Z

Check the reverse mapping records to make sure that the contents
make sense.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
---
fs/xfs/Makefile | 1
fs/xfs/libxfs/xfs_fs.h | 3 +
fs/xfs/scrub/common.h | 2 +
fs/xfs/scrub/rmap.c | 130 ++++++++++++++++++++++++++++++++++++++++++++++++
fs/xfs/scrub/scrub.c | 5 ++
fs/xfs/scrub/scrub.h | 1
6 files changed, 141 insertions(+), 1 deletion(-)
create mode 100644 fs/xfs/scrub/rmap.c

diff --git a/fs/xfs/Makefile b/fs/xfs/Makefile
index 82326b7..5a64f8d 100644
--- a/fs/xfs/Makefile
+++ b/fs/xfs/Makefile
@@ -151,6 +151,7 @@ xfs-y += $(addprefix scrub/, \
btree.o \
common.o \
ialloc.o \
+ rmap.o \
scrub.o \
)
endif
diff --git a/fs/xfs/libxfs/xfs_fs.h b/fs/xfs/libxfs/xfs_fs.h
index c8e6d89..74aa021 100644
--- a/fs/xfs/libxfs/xfs_fs.h
+++ b/fs/xfs/libxfs/xfs_fs.h
@@ -492,9 +492,10 @@ struct xfs_scrub_metadata {
#define XFS_SCRUB_TYPE_CNTBT 6 /* freesp by length btree */
#define XFS_SCRUB_TYPE_INOBT 7 /* inode btree */
#define XFS_SCRUB_TYPE_FINOBT 8 /* free inode btree */
+#define XFS_SCRUB_TYPE_RMAPBT 9 /* reverse mapping btree */

/* Number of scrub subcommands. */
-#define XFS_SCRUB_TYPE_NR 9
+#define XFS_SCRUB_TYPE_NR 10

/* i: Repair this metadata. */
#define XFS_SCRUB_IFLAG_REPAIR (1 << 0)
diff --git a/fs/xfs/scrub/common.h b/fs/xfs/scrub/common.h
index 8fc0619..9075a5c 100644
--- a/fs/xfs/scrub/common.h
+++ b/fs/xfs/scrub/common.h
@@ -98,6 +98,8 @@ int xfs_scrub_setup_ag_allocbt(struct xfs_scrub_context *sc,
struct xfs_inode *ip);
int xfs_scrub_setup_ag_iallocbt(struct xfs_scrub_context *sc,
struct xfs_inode *ip);
+int xfs_scrub_setup_ag_rmapbt(struct xfs_scrub_context *sc,
+ struct xfs_inode *ip);

void xfs_scrub_ag_free(struct xfs_scrub_context *sc, struct xfs_scrub_ag *sa);
diff --git a/fs/xfs/scrub/rmap.c b/fs/xfs/scrub/rmap.c
new file mode 100644
index 0000000..7331ecf
--- /dev/null
+++ b/fs/xfs/scrub/rmap.c
@@ -0,0 +1,130 @@
+/*
+ * Copyright (C) 2017 Oracle. All Rights Reserved.
+ *
+ * Author: Darrick J. Wong <darrick.wong@oracle.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it would be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+#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_rmap.h"
+#include "scrub/xfs_scrub.h"
+#include "scrub/scrub.h"
+#include "scrub/common.h"
+#include "scrub/btree.h"
+#include "scrub/trace.h"
+
+/*
+ * Set us up to scrub reverse mapping btrees.
+ */
+int
+xfs_scrub_setup_ag_rmapbt(
+ struct xfs_scrub_context *sc,
+ struct xfs_inode *ip)
+{
+ return xfs_scrub_setup_ag_btree(sc, ip, false);
+}
+
+/* Reverse-mapping scrubber. */
+
+/* Scrub an rmapbt record. */
+STATIC int
+xfs_scrub_rmapbt_helper(
+ struct xfs_scrub_btree *bs,
+ union xfs_btree_rec *rec)
+{
+ struct xfs_mount *mp = bs->cur->bc_mp;
+ struct xfs_agf *agf;
+ struct xfs_rmap_irec irec;
+ unsigned long long rec_end;
+ xfs_agblock_t eoag;
+ bool non_inode;
+ bool is_unwritten;
+ bool is_bmbt;
+ bool is_attr;
+ int error;
+
+ error = xfs_rmap_btrec_to_irec(rec, &irec);
+ if (!xfs_scrub_btree_op_ok(bs->sc, bs->cur, 0, &error))
+ goto out;
+
+ /* Check extent. */
+ agf = XFS_BUF_TO_AGF(bs->sc->sa.agf_bp);
+ eoag = be32_to_cpu(agf->agf_length);
+ rec_end = (unsigned long long)irec.rm_startblock + irec.rm_blockcount;
+
+ xfs_scrub_btree_check_ok(bs->sc, bs->cur, 0,
+ irec.rm_startblock < mp->m_sb.sb_agblocks &&
+ irec.rm_startblock < eoag &&
+ irec.rm_blockcount != 0 &&
+ rec_end <= mp->m_sb.sb_agblocks &&
+ rec_end <= eoag);
+
+ /* Check flags. */
+ non_inode = XFS_RMAP_NON_INODE_OWNER(irec.rm_owner);
+ is_bmbt = irec.rm_flags & XFS_RMAP_BMBT_BLOCK;
+ is_attr = irec.rm_flags & XFS_RMAP_ATTR_FORK;
+ is_unwritten = irec.rm_flags & XFS_RMAP_UNWRITTEN;
+
+ xfs_scrub_btree_check_ok(bs->sc, bs->cur, 0,
+ (!is_bmbt || irec.rm_offset == 0) &&
+ (!non_inode || irec.rm_offset == 0) &&
+ (!is_unwritten || !(is_bmbt || non_inode || is_attr)) &&
+ (!non_inode || !(is_bmbt || is_unwritten || is_attr)));
+
+ /* Owner inode within an AG? */
+ xfs_scrub_btree_check_ok(bs->sc, bs->cur, 0, non_inode ||
+ (XFS_INO_TO_AGNO(mp, irec.rm_owner) <
+ mp->m_sb.sb_agcount &&
+ XFS_AGINO_TO_AGBNO(mp,
+ XFS_INO_TO_AGINO(mp, irec.rm_owner)) <
+ mp->m_sb.sb_agblocks));
+ /* Owner inode within the FS? */
+ xfs_scrub_btree_check_ok(bs->sc, bs->cur, 0, non_inode ||
+ XFS_AGB_TO_DADDR(mp,
+ XFS_INO_TO_AGNO(mp, irec.rm_owner),
+ XFS_AGINO_TO_AGBNO(mp,
+ XFS_INO_TO_AGINO(mp, irec.rm_owner))) <
+ XFS_FSB_TO_BB(mp, mp->m_sb.sb_dblocks));
+
+ /* Non-inode owner within the magic values? */
+ xfs_scrub_btree_check_ok(bs->sc, bs->cur, 0, !non_inode ||
+ (irec.rm_owner > XFS_RMAP_OWN_MIN &&
+ irec.rm_owner <= XFS_RMAP_OWN_FS));
+out:
+ return error;
+}
+
+/* Scrub the rmap btree for some AG. */
+int
+xfs_scrub_rmapbt(
+ struct xfs_scrub_context *sc)
+{
+ struct xfs_owner_info oinfo;
+
+ xfs_rmap_ag_owner(&oinfo, XFS_RMAP_OWN_AG);
+ return xfs_scrub_btree(sc, sc->sa.rmap_cur, xfs_scrub_rmapbt_helper,
+ &oinfo, NULL);
+}
diff --git a/fs/xfs/scrub/scrub.c b/fs/xfs/scrub/scrub.c
index 9304bb3..a418269 100644
--- a/fs/xfs/scrub/scrub.c
+++ b/fs/xfs/scrub/scrub.c
@@ -195,6 +195,11 @@ static const struct xfs_scrub_meta_ops meta_scrub_ops[] = {
.scrub = xfs_scrub_finobt,
.has = xfs_sb_version_hasfinobt,
},
+ { /* rmapbt */
+ .setup = xfs_scrub_setup_ag_rmapbt,
+ .scrub = xfs_scrub_rmapbt,
+ .has = xfs_sb_version_hasrmapbt,
+ },
};

/* Dispatch metadata scrubbing. */
diff --git a/fs/xfs/scrub/scrub.h b/fs/xfs/scrub/scrub.h
index 55c9dde..f602ded 100644
--- a/fs/xfs/scrub/scrub.h
+++ b/fs/xfs/scrub/scrub.h
@@ -70,5 +70,6 @@ int xfs_scrub_bnobt(struct xfs_scrub_context *sc);
int xfs_scrub_cntbt(struct xfs_scrub_context *sc);
int xfs_scrub_inobt(struct xfs_scrub_context *sc);
int xfs_scrub_finobt(struct xfs_scrub_context *sc);
+int xfs_scrub_rmapbt(struct xfs_scrub_context *sc);

#endif /* __XFS_SCRUB_SCRUB_H__ */