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xfs: scrub the secondary superblocks

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Ensure that the geometry presented in the backup superblocks matches
the primary superblock so that repair can recover the filesystem if
that primary gets corrupted.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
This commit is contained in:
Darrick J. Wong 2017-10-17 21:37:38 -07:00
parent b6c1beb967
commit 21fb4cb198
6 changed files with 340 additions and 1 deletions
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1
fs/xfs/Makefile
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@ -143,6 +143,7 @@ ifeq ($(CONFIG_XFS_ONLINE_SCRUB),y)
xfs-y += $(addprefix scrub/, \
trace.o \
agheader.o \
btree.o \
common.o \
scrub.o \

3
fs/xfs/libxfs/xfs_fs.h
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@ -484,9 +484,10 @@ struct xfs_scrub_metadata {
/* Scrub subcommands. */
#define XFS_SCRUB_TYPE_PROBE 0 /* presence test ioctl */
#define XFS_SCRUB_TYPE_SB 1 /* superblock */
/* Number of scrub subcommands. */
#define XFS_SCRUB_TYPE_NR 1
#define XFS_SCRUB_TYPE_NR 2
/* i: Repair this metadata. */
#define XFS_SCRUB_IFLAG_REPAIR (1 << 0)

330
fs/xfs/scrub/agheader.c Normal file
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@ -0,0 +1,330 @@
/*
* 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_inode.h"
#include "scrub/xfs_scrub.h"
#include "scrub/scrub.h"
#include "scrub/common.h"
#include "scrub/trace.h"
/*
* Set up scrub to check all the static metadata in each AG.
* This means the SB, AGF, AGI, and AGFL headers.
*/
int
xfs_scrub_setup_ag_header(
struct xfs_scrub_context *sc,
struct xfs_inode *ip)
{
struct xfs_mount *mp = sc->mp;
if (sc->sm->sm_agno >= mp->m_sb.sb_agcount ||
sc->sm->sm_ino || sc->sm->sm_gen)
return -EINVAL;
return xfs_scrub_setup_fs(sc, ip);
}
/* Superblock */
/*
* Scrub the filesystem superblock.
*
* Note: We do /not/ attempt to check AG 0's superblock. Mount is
* responsible for validating all the geometry information in sb 0, so
* if the filesystem is capable of initiating online scrub, then clearly
* sb 0 is ok and we can use its information to check everything else.
*/
int
xfs_scrub_superblock(
struct xfs_scrub_context *sc)
{
struct xfs_mount *mp = sc->mp;
struct xfs_buf *bp;
struct xfs_dsb *sb;
xfs_agnumber_t agno;
uint32_t v2_ok;
__be32 features_mask;
int error;
__be16 vernum_mask;
agno = sc->sm->sm_agno;
if (agno == 0)
return 0;
error = xfs_trans_read_buf(mp, sc->tp, mp->m_ddev_targp,
XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)),
XFS_FSS_TO_BB(mp, 1), 0, &bp, &xfs_sb_buf_ops);
if (!xfs_scrub_process_error(sc, agno, XFS_SB_BLOCK(mp), &error))
return error;
sb = XFS_BUF_TO_SBP(bp);
/*
* Verify the geometries match. Fields that are permanently
* set by mkfs are checked; fields that can be updated later
* (and are not propagated to backup superblocks) are preen
* checked.
*/
if (sb->sb_blocksize != cpu_to_be32(mp->m_sb.sb_blocksize))
xfs_scrub_block_set_corrupt(sc, bp);
if (sb->sb_dblocks != cpu_to_be64(mp->m_sb.sb_dblocks))
xfs_scrub_block_set_corrupt(sc, bp);
if (sb->sb_rblocks != cpu_to_be64(mp->m_sb.sb_rblocks))
xfs_scrub_block_set_corrupt(sc, bp);
if (sb->sb_rextents != cpu_to_be64(mp->m_sb.sb_rextents))
xfs_scrub_block_set_corrupt(sc, bp);
if (!uuid_equal(&sb->sb_uuid, &mp->m_sb.sb_uuid))
xfs_scrub_block_set_preen(sc, bp);
if (sb->sb_logstart != cpu_to_be64(mp->m_sb.sb_logstart))
xfs_scrub_block_set_corrupt(sc, bp);
if (sb->sb_rootino != cpu_to_be64(mp->m_sb.sb_rootino))
xfs_scrub_block_set_preen(sc, bp);
if (sb->sb_rbmino != cpu_to_be64(mp->m_sb.sb_rbmino))
xfs_scrub_block_set_preen(sc, bp);
if (sb->sb_rsumino != cpu_to_be64(mp->m_sb.sb_rsumino))
xfs_scrub_block_set_preen(sc, bp);
if (sb->sb_rextsize != cpu_to_be32(mp->m_sb.sb_rextsize))
xfs_scrub_block_set_corrupt(sc, bp);
if (sb->sb_agblocks != cpu_to_be32(mp->m_sb.sb_agblocks))
xfs_scrub_block_set_corrupt(sc, bp);
if (sb->sb_agcount != cpu_to_be32(mp->m_sb.sb_agcount))
xfs_scrub_block_set_corrupt(sc, bp);
if (sb->sb_rbmblocks != cpu_to_be32(mp->m_sb.sb_rbmblocks))
xfs_scrub_block_set_corrupt(sc, bp);
if (sb->sb_logblocks != cpu_to_be32(mp->m_sb.sb_logblocks))
xfs_scrub_block_set_corrupt(sc, bp);
/* Check sb_versionnum bits that are set at mkfs time. */
vernum_mask = cpu_to_be16(~XFS_SB_VERSION_OKBITS |
XFS_SB_VERSION_NUMBITS |
XFS_SB_VERSION_ALIGNBIT |
XFS_SB_VERSION_DALIGNBIT |
XFS_SB_VERSION_SHAREDBIT |
XFS_SB_VERSION_LOGV2BIT |
XFS_SB_VERSION_SECTORBIT |
XFS_SB_VERSION_EXTFLGBIT |
XFS_SB_VERSION_DIRV2BIT);
if ((sb->sb_versionnum & vernum_mask) !=
(cpu_to_be16(mp->m_sb.sb_versionnum) & vernum_mask))
xfs_scrub_block_set_corrupt(sc, bp);
/* Check sb_versionnum bits that can be set after mkfs time. */
vernum_mask = cpu_to_be16(XFS_SB_VERSION_ATTRBIT |
XFS_SB_VERSION_NLINKBIT |
XFS_SB_VERSION_QUOTABIT);
if ((sb->sb_versionnum & vernum_mask) !=
(cpu_to_be16(mp->m_sb.sb_versionnum) & vernum_mask))
xfs_scrub_block_set_preen(sc, bp);
if (sb->sb_sectsize != cpu_to_be16(mp->m_sb.sb_sectsize))
xfs_scrub_block_set_corrupt(sc, bp);
if (sb->sb_inodesize != cpu_to_be16(mp->m_sb.sb_inodesize))
xfs_scrub_block_set_corrupt(sc, bp);
if (sb->sb_inopblock != cpu_to_be16(mp->m_sb.sb_inopblock))
xfs_scrub_block_set_corrupt(sc, bp);
if (memcmp(sb->sb_fname, mp->m_sb.sb_fname, sizeof(sb->sb_fname)))
xfs_scrub_block_set_preen(sc, bp);
if (sb->sb_blocklog != mp->m_sb.sb_blocklog)
xfs_scrub_block_set_corrupt(sc, bp);
if (sb->sb_sectlog != mp->m_sb.sb_sectlog)
xfs_scrub_block_set_corrupt(sc, bp);
if (sb->sb_inodelog != mp->m_sb.sb_inodelog)
xfs_scrub_block_set_corrupt(sc, bp);
if (sb->sb_inopblog != mp->m_sb.sb_inopblog)
xfs_scrub_block_set_corrupt(sc, bp);
if (sb->sb_agblklog != mp->m_sb.sb_agblklog)
xfs_scrub_block_set_corrupt(sc, bp);
if (sb->sb_rextslog != mp->m_sb.sb_rextslog)
xfs_scrub_block_set_corrupt(sc, bp);
if (sb->sb_imax_pct != mp->m_sb.sb_imax_pct)
xfs_scrub_block_set_preen(sc, bp);
/*
* Skip the summary counters since we track them in memory anyway.
* sb_icount, sb_ifree, sb_fdblocks, sb_frexents
*/
if (sb->sb_uquotino != cpu_to_be64(mp->m_sb.sb_uquotino))
xfs_scrub_block_set_preen(sc, bp);
if (sb->sb_gquotino != cpu_to_be64(mp->m_sb.sb_gquotino))
xfs_scrub_block_set_preen(sc, bp);
/*
* Skip the quota flags since repair will force quotacheck.
* sb_qflags
*/
if (sb->sb_flags != mp->m_sb.sb_flags)
xfs_scrub_block_set_corrupt(sc, bp);
if (sb->sb_shared_vn != mp->m_sb.sb_shared_vn)
xfs_scrub_block_set_corrupt(sc, bp);
if (sb->sb_inoalignmt != cpu_to_be32(mp->m_sb.sb_inoalignmt))
xfs_scrub_block_set_corrupt(sc, bp);
if (sb->sb_unit != cpu_to_be32(mp->m_sb.sb_unit))
xfs_scrub_block_set_preen(sc, bp);
if (sb->sb_width != cpu_to_be32(mp->m_sb.sb_width))
xfs_scrub_block_set_preen(sc, bp);
if (sb->sb_dirblklog != mp->m_sb.sb_dirblklog)
xfs_scrub_block_set_corrupt(sc, bp);
if (sb->sb_logsectlog != mp->m_sb.sb_logsectlog)
xfs_scrub_block_set_corrupt(sc, bp);
if (sb->sb_logsectsize != cpu_to_be16(mp->m_sb.sb_logsectsize))
xfs_scrub_block_set_corrupt(sc, bp);
if (sb->sb_logsunit != cpu_to_be32(mp->m_sb.sb_logsunit))
xfs_scrub_block_set_corrupt(sc, bp);
/* Do we see any invalid bits in sb_features2? */
if (!xfs_sb_version_hasmorebits(&mp->m_sb)) {
if (sb->sb_features2 != 0)
xfs_scrub_block_set_corrupt(sc, bp);
} else {
v2_ok = XFS_SB_VERSION2_OKBITS;
if (XFS_SB_VERSION_NUM(&mp->m_sb) >= XFS_SB_VERSION_5)
v2_ok |= XFS_SB_VERSION2_CRCBIT;
if (!!(sb->sb_features2 & cpu_to_be32(~v2_ok)))
xfs_scrub_block_set_corrupt(sc, bp);
if (sb->sb_features2 != sb->sb_bad_features2)
xfs_scrub_block_set_preen(sc, bp);
}
/* Check sb_features2 flags that are set at mkfs time. */
features_mask = cpu_to_be32(XFS_SB_VERSION2_LAZYSBCOUNTBIT |
XFS_SB_VERSION2_PROJID32BIT |
XFS_SB_VERSION2_CRCBIT |
XFS_SB_VERSION2_FTYPE);
if ((sb->sb_features2 & features_mask) !=
(cpu_to_be32(mp->m_sb.sb_features2) & features_mask))
xfs_scrub_block_set_corrupt(sc, bp);
/* Check sb_features2 flags that can be set after mkfs time. */
features_mask = cpu_to_be32(XFS_SB_VERSION2_ATTR2BIT);
if ((sb->sb_features2 & features_mask) !=
(cpu_to_be32(mp->m_sb.sb_features2) & features_mask))
xfs_scrub_block_set_corrupt(sc, bp);
if (!xfs_sb_version_hascrc(&mp->m_sb)) {
/* all v5 fields must be zero */
if (memchr_inv(&sb->sb_features_compat, 0,
sizeof(struct xfs_dsb) -
offsetof(struct xfs_dsb, sb_features_compat)))
xfs_scrub_block_set_corrupt(sc, bp);
} else {
/* Check compat flags; all are set at mkfs time. */
features_mask = cpu_to_be32(XFS_SB_FEAT_COMPAT_UNKNOWN);
if ((sb->sb_features_compat & features_mask) !=
(cpu_to_be32(mp->m_sb.sb_features_compat) & features_mask))
xfs_scrub_block_set_corrupt(sc, bp);
/* Check ro compat flags; all are set at mkfs time. */
features_mask = cpu_to_be32(XFS_SB_FEAT_RO_COMPAT_UNKNOWN |
XFS_SB_FEAT_RO_COMPAT_FINOBT |
XFS_SB_FEAT_RO_COMPAT_RMAPBT |
XFS_SB_FEAT_RO_COMPAT_REFLINK);
if ((sb->sb_features_ro_compat & features_mask) !=
(cpu_to_be32(mp->m_sb.sb_features_ro_compat) &
features_mask))
xfs_scrub_block_set_corrupt(sc, bp);
/* Check incompat flags; all are set at mkfs time. */
features_mask = cpu_to_be32(XFS_SB_FEAT_INCOMPAT_UNKNOWN |
XFS_SB_FEAT_INCOMPAT_FTYPE |
XFS_SB_FEAT_INCOMPAT_SPINODES |
XFS_SB_FEAT_INCOMPAT_META_UUID);
if ((sb->sb_features_incompat & features_mask) !=
(cpu_to_be32(mp->m_sb.sb_features_incompat) &
features_mask))
xfs_scrub_block_set_corrupt(sc, bp);
/* Check log incompat flags; all are set at mkfs time. */
features_mask = cpu_to_be32(XFS_SB_FEAT_INCOMPAT_LOG_UNKNOWN);
if ((sb->sb_features_log_incompat & features_mask) !=
(cpu_to_be32(mp->m_sb.sb_features_log_incompat) &
features_mask))
xfs_scrub_block_set_corrupt(sc, bp);
/* Don't care about sb_crc */
if (sb->sb_spino_align != cpu_to_be32(mp->m_sb.sb_spino_align))
xfs_scrub_block_set_corrupt(sc, bp);
if (sb->sb_pquotino != cpu_to_be64(mp->m_sb.sb_pquotino))
xfs_scrub_block_set_preen(sc, bp);
/* Don't care about sb_lsn */
}
if (xfs_sb_version_hasmetauuid(&mp->m_sb)) {
/* The metadata UUID must be the same for all supers */
if (!uuid_equal(&sb->sb_meta_uuid, &mp->m_sb.sb_meta_uuid))
xfs_scrub_block_set_corrupt(sc, bp);
}
/* Everything else must be zero. */
if (memchr_inv(sb + 1, 0,
BBTOB(bp->b_length) - sizeof(struct xfs_dsb)))
xfs_scrub_block_set_corrupt(sc, bp);
return error;
}

2
fs/xfs/scrub/common.h
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@ -76,6 +76,8 @@ void xfs_scrub_set_incomplete(struct xfs_scrub_context *sc);
/* Setup functions */
int xfs_scrub_setup_fs(struct xfs_scrub_context *sc, struct xfs_inode *ip);
int xfs_scrub_setup_ag_header(struct xfs_scrub_context *sc,
struct xfs_inode *ip);
void xfs_scrub_ag_free(struct xfs_scrub_context *sc, struct xfs_scrub_ag *sa);
int xfs_scrub_ag_init(struct xfs_scrub_context *sc, xfs_agnumber_t agno,

4
fs/xfs/scrub/scrub.c
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@ -158,6 +158,10 @@ static const struct xfs_scrub_meta_ops meta_scrub_ops[] = {
.setup = xfs_scrub_setup_fs,
.scrub = xfs_scrub_probe,
},
{ /* superblock */
.setup = xfs_scrub_setup_ag_header,
.scrub = xfs_scrub_superblock,
},
};
/* This isn't a stable feature, warn once per day. */

1
fs/xfs/scrub/scrub.h
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@ -67,5 +67,6 @@ struct xfs_scrub_context {
/* Metadata scrubbers */
int xfs_scrub_tester(struct xfs_scrub_context *sc);
int xfs_scrub_superblock(struct xfs_scrub_context *sc);
#endif /* __XFS_SCRUB_SCRUB_H__ */