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Diffstat (limited to 'fs/xfs/scrub/agheader.c')
-rw-r--r--fs/xfs/scrub/agheader.c658
1 files changed, 658 insertions, 0 deletions
diff --git a/fs/xfs/scrub/agheader.c b/fs/xfs/scrub/agheader.c
new file mode 100644
index 000000000000..2a9b4f9e93c6
--- /dev/null
+++ b/fs/xfs/scrub/agheader.c
@@ -0,0 +1,658 @@
+/*
+ * 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 "xfs_alloc.h"
+#include "xfs_ialloc.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);
+}
+
+/* Walk all the blocks in the AGFL. */
+int
+xfs_scrub_walk_agfl(
+ struct xfs_scrub_context *sc,
+ int (*fn)(struct xfs_scrub_context *,
+ xfs_agblock_t bno, void *),
+ void *priv)
+{
+ struct xfs_agf *agf;
+ __be32 *agfl_bno;
+ struct xfs_mount *mp = sc->mp;
+ unsigned int flfirst;
+ unsigned int fllast;
+ int i;
+ int error;
+
+ agf = XFS_BUF_TO_AGF(sc->sa.agf_bp);
+ agfl_bno = XFS_BUF_TO_AGFL_BNO(mp, sc->sa.agfl_bp);
+ flfirst = be32_to_cpu(agf->agf_flfirst);
+ fllast = be32_to_cpu(agf->agf_fllast);
+
+ /* Nothing to walk in an empty AGFL. */
+ if (agf->agf_flcount == cpu_to_be32(0))
+ return 0;
+
+ /* first to last is a consecutive list. */
+ if (fllast >= flfirst) {
+ for (i = flfirst; i <= fllast; i++) {
+ error = fn(sc, be32_to_cpu(agfl_bno[i]), priv);
+ if (error)
+ return error;
+ if (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)
+ return error;
+ }
+
+ return 0;
+ }
+
+ /* first to the end */
+ for (i = flfirst; i < XFS_AGFL_SIZE(mp); i++) {
+ error = fn(sc, be32_to_cpu(agfl_bno[i]), priv);
+ if (error)
+ return error;
+ if (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)
+ return error;
+ }
+
+ /* the start to last. */
+ for (i = 0; i <= fllast; i++) {
+ error = fn(sc, be32_to_cpu(agfl_bno[i]), priv);
+ if (error)
+ return error;
+ if (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)
+ return error;
+ }
+
+ return 0;
+}
+
+/* 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;
+}
+
+/* AGF */
+
+/* Scrub the AGF. */
+int
+xfs_scrub_agf(
+ struct xfs_scrub_context *sc)
+{
+ struct xfs_mount *mp = sc->mp;
+ struct xfs_agf *agf;
+ xfs_agnumber_t agno;
+ xfs_agblock_t agbno;
+ xfs_agblock_t eoag;
+ xfs_agblock_t agfl_first;
+ xfs_agblock_t agfl_last;
+ xfs_agblock_t agfl_count;
+ xfs_agblock_t fl_count;
+ int level;
+ int error = 0;
+
+ agno = sc->sa.agno = sc->sm->sm_agno;
+ error = xfs_scrub_ag_read_headers(sc, agno, &sc->sa.agi_bp,
+ &sc->sa.agf_bp, &sc->sa.agfl_bp);
+ if (!xfs_scrub_process_error(sc, agno, XFS_AGF_BLOCK(sc->mp), &error))
+ goto out;
+
+ agf = XFS_BUF_TO_AGF(sc->sa.agf_bp);
+
+ /* Check the AG length */
+ eoag = be32_to_cpu(agf->agf_length);
+ if (eoag != xfs_ag_block_count(mp, agno))
+ xfs_scrub_block_set_corrupt(sc, sc->sa.agf_bp);
+
+ /* Check the AGF btree roots and levels */
+ agbno = be32_to_cpu(agf->agf_roots[XFS_BTNUM_BNO]);
+ if (!xfs_verify_agbno(mp, agno, agbno))
+ xfs_scrub_block_set_corrupt(sc, sc->sa.agf_bp);
+
+ agbno = be32_to_cpu(agf->agf_roots[XFS_BTNUM_CNT]);
+ if (!xfs_verify_agbno(mp, agno, agbno))
+ xfs_scrub_block_set_corrupt(sc, sc->sa.agf_bp);
+
+ level = be32_to_cpu(agf->agf_levels[XFS_BTNUM_BNO]);
+ if (level <= 0 || level > XFS_BTREE_MAXLEVELS)
+ xfs_scrub_block_set_corrupt(sc, sc->sa.agf_bp);
+
+ level = be32_to_cpu(agf->agf_levels[XFS_BTNUM_CNT]);
+ if (level <= 0 || level > XFS_BTREE_MAXLEVELS)
+ xfs_scrub_block_set_corrupt(sc, sc->sa.agf_bp);
+
+ if (xfs_sb_version_hasrmapbt(&mp->m_sb)) {
+ agbno = be32_to_cpu(agf->agf_roots[XFS_BTNUM_RMAP]);
+ if (!xfs_verify_agbno(mp, agno, agbno))
+ xfs_scrub_block_set_corrupt(sc, sc->sa.agf_bp);
+
+ level = be32_to_cpu(agf->agf_levels[XFS_BTNUM_RMAP]);
+ if (level <= 0 || level > XFS_BTREE_MAXLEVELS)
+ xfs_scrub_block_set_corrupt(sc, sc->sa.agf_bp);
+ }
+
+ if (xfs_sb_version_hasreflink(&mp->m_sb)) {
+ agbno = be32_to_cpu(agf->agf_refcount_root);
+ if (!xfs_verify_agbno(mp, agno, agbno))
+ xfs_scrub_block_set_corrupt(sc, sc->sa.agf_bp);
+
+ level = be32_to_cpu(agf->agf_refcount_level);
+ if (level <= 0 || level > XFS_BTREE_MAXLEVELS)
+ xfs_scrub_block_set_corrupt(sc, sc->sa.agf_bp);
+ }
+
+ /* Check the AGFL counters */
+ agfl_first = be32_to_cpu(agf->agf_flfirst);
+ agfl_last = be32_to_cpu(agf->agf_fllast);
+ agfl_count = be32_to_cpu(agf->agf_flcount);
+ if (agfl_last > agfl_first)
+ fl_count = agfl_last - agfl_first + 1;
+ else
+ fl_count = XFS_AGFL_SIZE(mp) - agfl_first + agfl_last + 1;
+ if (agfl_count != 0 && fl_count != agfl_count)
+ xfs_scrub_block_set_corrupt(sc, sc->sa.agf_bp);
+
+out:
+ return error;
+}
+
+/* AGFL */
+
+struct xfs_scrub_agfl_info {
+ unsigned int sz_entries;
+ unsigned int nr_entries;
+ xfs_agblock_t *entries;
+};
+
+/* Scrub an AGFL block. */
+STATIC int
+xfs_scrub_agfl_block(
+ struct xfs_scrub_context *sc,
+ xfs_agblock_t agbno,
+ void *priv)
+{
+ struct xfs_mount *mp = sc->mp;
+ struct xfs_scrub_agfl_info *sai = priv;
+ xfs_agnumber_t agno = sc->sa.agno;
+
+ if (xfs_verify_agbno(mp, agno, agbno) &&
+ sai->nr_entries < sai->sz_entries)
+ sai->entries[sai->nr_entries++] = agbno;
+ else
+ xfs_scrub_block_set_corrupt(sc, sc->sa.agfl_bp);
+
+ return 0;
+}
+
+static int
+xfs_scrub_agblock_cmp(
+ const void *pa,
+ const void *pb)
+{
+ const xfs_agblock_t *a = pa;
+ const xfs_agblock_t *b = pb;
+
+ return (int)*a - (int)*b;
+}
+
+/* Scrub the AGFL. */
+int
+xfs_scrub_agfl(
+ struct xfs_scrub_context *sc)
+{
+ struct xfs_scrub_agfl_info sai = { 0 };
+ struct xfs_agf *agf;
+ xfs_agnumber_t agno;
+ unsigned int agflcount;
+ unsigned int i;
+ int error;
+
+ agno = sc->sa.agno = sc->sm->sm_agno;
+ error = xfs_scrub_ag_read_headers(sc, agno, &sc->sa.agi_bp,
+ &sc->sa.agf_bp, &sc->sa.agfl_bp);
+ if (!xfs_scrub_process_error(sc, agno, XFS_AGFL_BLOCK(sc->mp), &error))
+ goto out;
+ if (!sc->sa.agf_bp)
+ return -EFSCORRUPTED;
+
+ /* Allocate buffer to ensure uniqueness of AGFL entries. */
+ agf = XFS_BUF_TO_AGF(sc->sa.agf_bp);
+ agflcount = be32_to_cpu(agf->agf_flcount);
+ if (agflcount > XFS_AGFL_SIZE(sc->mp)) {
+ xfs_scrub_block_set_corrupt(sc, sc->sa.agf_bp);
+ goto out;
+ }
+ sai.sz_entries = agflcount;
+ sai.entries = kmem_zalloc(sizeof(xfs_agblock_t) * agflcount, KM_NOFS);
+ if (!sai.entries) {
+ error = -ENOMEM;
+ goto out;
+ }
+
+ /* Check the blocks in the AGFL. */
+ error = xfs_scrub_walk_agfl(sc, xfs_scrub_agfl_block, &sai);
+ if (error)
+ goto out_free;
+
+ if (agflcount != sai.nr_entries) {
+ xfs_scrub_block_set_corrupt(sc, sc->sa.agf_bp);
+ goto out_free;
+ }
+
+ /* Sort entries, check for duplicates. */
+ sort(sai.entries, sai.nr_entries, sizeof(sai.entries[0]),
+ xfs_scrub_agblock_cmp, NULL);
+ for (i = 1; i < sai.nr_entries; i++) {
+ if (sai.entries[i] == sai.entries[i - 1]) {
+ xfs_scrub_block_set_corrupt(sc, sc->sa.agf_bp);
+ break;
+ }
+ }
+
+out_free:
+ kmem_free(sai.entries);
+out:
+ return error;
+}
+
+/* AGI */
+
+/* Scrub the AGI. */
+int
+xfs_scrub_agi(
+ struct xfs_scrub_context *sc)
+{
+ struct xfs_mount *mp = sc->mp;
+ struct xfs_agi *agi;
+ xfs_agnumber_t agno;
+ xfs_agblock_t agbno;
+ xfs_agblock_t eoag;
+ xfs_agino_t agino;
+ xfs_agino_t first_agino;
+ xfs_agino_t last_agino;
+ xfs_agino_t icount;
+ int i;
+ int level;
+ int error = 0;
+
+ agno = sc->sa.agno = sc->sm->sm_agno;
+ error = xfs_scrub_ag_read_headers(sc, agno, &sc->sa.agi_bp,
+ &sc->sa.agf_bp, &sc->sa.agfl_bp);
+ if (!xfs_scrub_process_error(sc, agno, XFS_AGI_BLOCK(sc->mp), &error))
+ goto out;
+
+ agi = XFS_BUF_TO_AGI(sc->sa.agi_bp);
+
+ /* Check the AG length */
+ eoag = be32_to_cpu(agi->agi_length);
+ if (eoag != xfs_ag_block_count(mp, agno))
+ xfs_scrub_block_set_corrupt(sc, sc->sa.agi_bp);
+
+ /* Check btree roots and levels */
+ agbno = be32_to_cpu(agi->agi_root);
+ if (!xfs_verify_agbno(mp, agno, agbno))
+ xfs_scrub_block_set_corrupt(sc, sc->sa.agi_bp);
+
+ level = be32_to_cpu(agi->agi_level);
+ if (level <= 0 || level > XFS_BTREE_MAXLEVELS)
+ xfs_scrub_block_set_corrupt(sc, sc->sa.agi_bp);
+
+ if (xfs_sb_version_hasfinobt(&mp->m_sb)) {
+ agbno = be32_to_cpu(agi->agi_free_root);
+ if (!xfs_verify_agbno(mp, agno, agbno))
+ xfs_scrub_block_set_corrupt(sc, sc->sa.agi_bp);
+
+ level = be32_to_cpu(agi->agi_free_level);
+ if (level <= 0 || level > XFS_BTREE_MAXLEVELS)
+ xfs_scrub_block_set_corrupt(sc, sc->sa.agi_bp);
+ }
+
+ /* Check inode counters */
+ xfs_ialloc_agino_range(mp, agno, &first_agino, &last_agino);
+ icount = be32_to_cpu(agi->agi_count);
+ if (icount > last_agino - first_agino + 1 ||
+ icount < be32_to_cpu(agi->agi_freecount))
+ xfs_scrub_block_set_corrupt(sc, sc->sa.agi_bp);
+
+ /* Check inode pointers */
+ agino = be32_to_cpu(agi->agi_newino);
+ if (agino != NULLAGINO && !xfs_verify_agino(mp, agno, agino))
+ xfs_scrub_block_set_corrupt(sc, sc->sa.agi_bp);
+
+ agino = be32_to_cpu(agi->agi_dirino);
+ if (agino != NULLAGINO && !xfs_verify_agino(mp, agno, agino))
+ xfs_scrub_block_set_corrupt(sc, sc->sa.agi_bp);
+
+ /* Check unlinked inode buckets */
+ for (i = 0; i < XFS_AGI_UNLINKED_BUCKETS; i++) {
+ agino = be32_to_cpu(agi->agi_unlinked[i]);
+ if (agino == NULLAGINO)
+ continue;
+ if (!xfs_verify_agino(mp, agno, agino))
+ xfs_scrub_block_set_corrupt(sc, sc->sa.agi_bp);
+ }
+
+ if (agi->agi_pad32 != cpu_to_be32(0))
+ xfs_scrub_block_set_corrupt(sc, sc->sa.agi_bp);
+
+out:
+ return error;
+}