From: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
If one of the backup superblocks is found to differ seriously from
superblock 0, write out a fresh copy from the in-core sb.
Signed-off-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
---
fs/xfs/Makefile | 1 +
fs/xfs/scrub/agheader_repair.c | 76 ++++++++++++++++++++++++++++++++++++++++
fs/xfs/scrub/repair.h | 2 +
fs/xfs/scrub/scrub.c | 2 +
4 files changed, 80 insertions(+), 1 deletion(-)
create mode 100644 fs/xfs/scrub/agheader_repair.c
diff --git a/fs/xfs/Makefile b/fs/xfs/Makefile
index 9175d51..cf64415 100644
--- a/fs/xfs/Makefile
+++ b/fs/xfs/Makefile
@@ -173,6 +173,7 @@ xfs-$(CONFIG_XFS_QUOTA) += scrub/quota.o
# online repair
ifeq ($(CONFIG_XFS_ONLINE_REPAIR),y)
xfs-y += $(addprefix scrub/, \
+ agheader_repair.o \
repair.o \
)
endif
diff --git a/fs/xfs/scrub/agheader_repair.c b/fs/xfs/scrub/agheader_repair.c
new file mode 100644
index 0000000..959b8c6
--- /dev/null
+++ b/fs/xfs/scrub/agheader_repair.c
@@ -0,0 +1,76 @@
+/*
+ * Copyright (C) 2018 Oracle. All Rights Reserved.
+ *
+ * Author: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
+ *
+ * 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_inode.h"
+#include "xfs_alloc.h"
+#include "xfs_ialloc.h"
+#include "xfs_rmap.h"
+#include "scrub/xfs_scrub.h"
+#include "scrub/scrub.h"
+#include "scrub/common.h"
+#include "scrub/trace.h"
+
+/* Superblock */
+
+/* Repair the superblock. */
+int
+xfs_repair_superblock(
+ struct xfs_scrub_context *sc)
+{
+ struct xfs_mount *mp = sc->mp;
+ struct xfs_buf *bp;
+ struct xfs_dsb *sbp;
+ xfs_agnumber_t agno;
+ int error;
+
+ /* Don't try to repair AG 0's sb; let xfs_repair deal with it. */
+ agno = sc->sm->sm_agno;
+ if (agno == 0)
+ return -EOPNOTSUPP;
+
+ bp = xfs_buf_get_uncached(mp->m_ddev_targp, XFS_FSS_TO_BB(mp, 1), 0);
+ if (!bp)
+ return -ENOMEM;
+
+ xfs_buf_zero(bp, 0, BBTOB(bp->b_length));
+ bp->b_bn = XFS_AG_DADDR(mp, agno, XFS_SB_BLOCK(mp));
+ bp->b_maps[0].bm_bn = XFS_AG_DADDR(mp, agno, XFS_SB_BLOCK(mp));
+ bp->b_ops = &xfs_sb_buf_ops;
+
+ /* Copy AG 0's superblock to this one. */
+ sbp = XFS_BUF_TO_SBP(bp);
+ xfs_sb_to_disk(sbp, &mp->m_sb);
+
+ /* Write this to disk. */
+ error = xfs_bwrite(bp);
+ xfs_buf_relse(bp);
+ return error;
+}
diff --git a/fs/xfs/scrub/repair.h b/fs/xfs/scrub/repair.h
index 0cb91dc..0090087 100644
--- a/fs/xfs/scrub/repair.h
+++ b/fs/xfs/scrub/repair.h
@@ -103,6 +103,7 @@ int xfs_repair_ino_dqattach(struct xfs_scrub_context *sc);
/* Metadata repairers */
int xfs_repair_probe(struct xfs_scrub_context *sc);
+int xfs_repair_superblock(struct xfs_scrub_context *sc);
#else
@@ -131,6 +132,7 @@ static inline int xfs_repair_reset_counters(struct xfs_mount *mp)
}
#define xfs_repair_probe xfs_repair_notsupported
+#define xfs_repair_superblock xfs_repair_notsupported
#endif /* CONFIG_XFS_ONLINE_REPAIR */
diff --git a/fs/xfs/scrub/scrub.c b/fs/xfs/scrub/scrub.c
index 9cdc3f0..d7bcf31 100644
--- a/fs/xfs/scrub/scrub.c
+++ b/fs/xfs/scrub/scrub.c
@@ -218,7 +218,7 @@ static const struct xfs_scrub_meta_ops meta_scrub_ops[] = {
.type = ST_PERAG,
.setup = xfs_scrub_setup_fs,
.scrub = xfs_scrub_superblock,
- .repair = xfs_repair_notsupported,
+ .repair = xfs_repair_superblock,
},
[XFS_SCRUB_TYPE_AGF] = { /* agf */
.type = ST_PERAG,
--
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