From: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
Add a forgotten check to the AGI verifier, then wire up the scrub
infrastructure to check the AGI contents.
Signed-off-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
---
fs/xfs/libxfs/xfs_fs.h | 3 +
fs/xfs/scrub/agheader.c | 96 +++++++++++++++++++++++++++++++++++++++++++++++
fs/xfs/scrub/common.c | 7 ++-
fs/xfs/scrub/common.h | 1
fs/xfs/xfs_trace.h | 3 +
5 files changed, 106 insertions(+), 4 deletions(-)
diff --git a/fs/xfs/libxfs/xfs_fs.h b/fs/xfs/libxfs/xfs_fs.h
index 82ba189b..2253df4 100644
--- a/fs/xfs/libxfs/xfs_fs.h
+++ b/fs/xfs/libxfs/xfs_fs.h
@@ -496,7 +496,8 @@ struct xfs_scrub_metadata {
#define XFS_SCRUB_TYPE_SB 1 /* superblock */
#define XFS_SCRUB_TYPE_AGF 2 /* AG free header */
#define XFS_SCRUB_TYPE_AGFL 3 /* AG free list */
-#define XFS_SCRUB_TYPE_MAX 3
+#define XFS_SCRUB_TYPE_AGI 4 /* AG inode header */
+#define XFS_SCRUB_TYPE_MAX 4
#define XFS_SCRUB_FLAG_REPAIR 0x01 /* i: repair this metadata */
#define XFS_SCRUB_FLAG_CORRUPT 0x02 /* o: needs repair */
diff --git a/fs/xfs/scrub/agheader.c b/fs/xfs/scrub/agheader.c
index 94f29ae..f3bbd89 100644
--- a/fs/xfs/scrub/agheader.c
+++ b/fs/xfs/scrub/agheader.c
@@ -423,3 +423,99 @@ xfs_scrub_agfl(
}
#undef XFS_SCRUB_AGFL_OP_ERROR_GOTO
#undef XFS_SCRUB_AGFL_CHECK
+
+/* AGI */
+
+#define XFS_SCRUB_AGI_CHECK(fs_ok) \
+ XFS_SCRUB_CHECK(sc, sc->sa.agi_bp, "AGI", fs_ok)
+#define XFS_SCRUB_AGI_OP_ERROR_GOTO(error, label) \
+ XFS_SCRUB_OP_ERROR_GOTO(sc, sc->sm->sm_agno, \
+ XFS_AGI_BLOCK(sc->tp->t_mountp), "AGI", error, label)
+/* Scrub the AGI. */
+int
+xfs_scrub_agi(
+ struct xfs_scrub_context *sc)
+{
+ struct xfs_mount *mp = sc->tp->t_mountp;
+ struct xfs_agi *agi;
+ xfs_daddr_t daddr;
+ xfs_daddr_t eofs;
+ 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;
+ int i;
+ int level;
+ int error = 0;
+
+ agno = sc->sm->sm_agno;
+ error = xfs_scrub_load_ag_headers(sc, agno, XFS_SCRUB_TYPE_AGI);
+ XFS_SCRUB_AGI_OP_ERROR_GOTO(&error, out);
+
+ agi = XFS_BUF_TO_AGI(sc->sa.agi_bp);
+ eofs = XFS_FSB_TO_BB(mp, mp->m_sb.sb_dblocks);
+
+ /* Check the AG length */
+ eoag = be32_to_cpu(agi->agi_length);
+ XFS_SCRUB_AGI_CHECK(eoag == xfs_scrub_ag_blocks(mp, agno));
+
+ /* Check btree roots and levels */
+ agbno = be32_to_cpu(agi->agi_root);
+ daddr = XFS_AGB_TO_DADDR(mp, agno, agbno);
+ XFS_SCRUB_AGI_CHECK(agbno > XFS_AGI_BLOCK(mp));
+ XFS_SCRUB_AGI_CHECK(agbno < mp->m_sb.sb_agblocks);
+ XFS_SCRUB_AGI_CHECK(agbno < eoag);
+ XFS_SCRUB_AGI_CHECK(daddr < eofs);
+
+ level = be32_to_cpu(agi->agi_level);
+ XFS_SCRUB_AGI_CHECK(level > 0);
+ XFS_SCRUB_AGI_CHECK(level <= XFS_BTREE_MAXLEVELS);
+
+ if (xfs_sb_version_hasfinobt(&mp->m_sb)) {
+ agbno = be32_to_cpu(agi->agi_free_root);
+ daddr = XFS_AGB_TO_DADDR(mp, agno, agbno);
+ XFS_SCRUB_AGI_CHECK(agbno > XFS_AGI_BLOCK(mp));
+ XFS_SCRUB_AGI_CHECK(agbno < mp->m_sb.sb_agblocks);
+ XFS_SCRUB_AGI_CHECK(agbno < eoag);
+ XFS_SCRUB_AGI_CHECK(daddr < eofs);
+
+ level = be32_to_cpu(agi->agi_free_level);
+ XFS_SCRUB_AGI_CHECK(level > 0);
+ XFS_SCRUB_AGI_CHECK(level <= XFS_BTREE_MAXLEVELS);
+ }
+
+ /* Check inode counters */
+ first_agino = XFS_OFFBNO_TO_AGINO(mp, XFS_AGI_BLOCK(mp) + 1, 0);
+ last_agino = XFS_OFFBNO_TO_AGINO(mp, eoag + 1, 0) - 1;
+ agino = be32_to_cpu(agi->agi_count);
+ XFS_SCRUB_AGI_CHECK(agino <= last_agino - first_agino + 1);
+ XFS_SCRUB_AGI_CHECK(agino >= be32_to_cpu(agi->agi_freecount));
+
+ /* Check inode pointers */
+ agino = be32_to_cpu(agi->agi_newino);
+ if (agino != NULLAGINO) {
+ XFS_SCRUB_AGI_CHECK(agino >= first_agino);
+ XFS_SCRUB_AGI_CHECK(agino <= last_agino);
+ }
+ agino = be32_to_cpu(agi->agi_dirino);
+ if (agino != NULLAGINO) {
+ XFS_SCRUB_AGI_CHECK(agino >= first_agino);
+ XFS_SCRUB_AGI_CHECK(agino <= last_agino);
+ }
+
+ /* 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;
+ XFS_SCRUB_AGI_CHECK(agino >= first_agino);
+ XFS_SCRUB_AGI_CHECK(agino <= last_agino);
+ }
+
+out:
+ return error;
+}
+#undef XFS_SCRUB_AGI_CHECK
+#undef XFS_SCRUB_AGI_OP_ERROR_GOTO
diff --git a/fs/xfs/scrub/common.c b/fs/xfs/scrub/common.c
index ccd3549..6725e36 100644
--- a/fs/xfs/scrub/common.c
+++ b/fs/xfs/scrub/common.c
@@ -641,12 +641,14 @@ xfs_scrub_load_ag_headers(
struct xfs_mount *mp = sc->tp->t_mountp;
int error;
- ASSERT(type == XFS_SCRUB_TYPE_AGF || type == XFS_SCRUB_TYPE_AGFL);
+ ASSERT(type == XFS_SCRUB_TYPE_AGF || type == XFS_SCRUB_TYPE_AGFL ||
+ type == XFS_SCRUB_TYPE_AGI);
memset(&sc->sa, 0, sizeof(sc->sa));
sc->sa.agno = agno;
error = xfs_scrub_load_ag_header(sc, XFS_AGI_DADDR(mp),
- &sc->sa.agi_bp, &xfs_agi_buf_ops, false);
+ &sc->sa.agi_bp, &xfs_agi_buf_ops,
+ type == XFS_SCRUB_TYPE_AGI);
if (error)
return error;
@@ -680,6 +682,7 @@ static const struct xfs_scrub_meta_fns meta_scrub_fns[] = {
{xfs_scrub_setup_ag, xfs_scrub_superblock, NULL, NULL},
{xfs_scrub_setup_ag, xfs_scrub_agf, NULL, NULL},
{xfs_scrub_setup_ag, xfs_scrub_agfl, NULL, NULL},
+ {xfs_scrub_setup_ag, xfs_scrub_agi, NULL, NULL},
};
/* Dispatch metadata scrubbing. */
diff --git a/fs/xfs/scrub/common.h b/fs/xfs/scrub/common.h
index 72bb175..e11b3fb 100644
--- a/fs/xfs/scrub/common.h
+++ b/fs/xfs/scrub/common.h
@@ -210,5 +210,6 @@ int xfs_scrub_setup_ag(struct xfs_scrub_context *sc, struct xfs_inode *ip,
int xfs_scrub_superblock(struct xfs_scrub_context *sc);
int xfs_scrub_agf(struct xfs_scrub_context *sc);
int xfs_scrub_agfl(struct xfs_scrub_context *sc);
+int xfs_scrub_agi(struct xfs_scrub_context *sc);
#endif /* __XFS_REPAIR_COMMON_H__ */
diff --git a/fs/xfs/xfs_trace.h b/fs/xfs/xfs_trace.h
index fb65a1f..56e0447 100644
--- a/fs/xfs/xfs_trace.h
+++ b/fs/xfs/xfs_trace.h
@@ -3357,7 +3357,8 @@ DEFINE_GETFSMAP_EVENT(xfs_getfsmap_mapping);
{ XFS_SCRUB_TYPE_TEST, "dummy" }, \
{ XFS_SCRUB_TYPE_SB, "superblock" }, \
{ XFS_SCRUB_TYPE_AGF, "AGF" }, \
- { XFS_SCRUB_TYPE_AGFL, "AGFL" }
+ { XFS_SCRUB_TYPE_AGFL, "AGFL" }, \
+ { XFS_SCRUB_TYPE_AGI, "AGI" }
DECLARE_EVENT_CLASS(xfs_scrub_class,
TP_PROTO(struct xfs_inode *ip, struct xfs_scrub_metadata *sm,
int error),
