--- /dev/null
+/*
+ * 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;
+}
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