From: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
Rebuild the AGI header items with some help from the rmapbt.
Signed-off-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
---
fs/xfs/scrub/agheader_repair.c | 219 ++++++++++++++++++++++++++++++++++++++++
fs/xfs/scrub/repair.h | 2
fs/xfs/scrub/scrub.c | 2
3 files changed, 222 insertions(+), 1 deletion(-)
diff --git a/fs/xfs/scrub/agheader_repair.c b/fs/xfs/scrub/agheader_repair.c
index 0decf711b3c7..df8657a5d475 100644
--- a/fs/xfs/scrub/agheader_repair.c
+++ b/fs/xfs/scrub/agheader_repair.c
@@ -708,3 +708,222 @@ xrep_agfl(
xfs_bitmap_destroy(&agfl_extents);
return error;
}
+
+/* AGI */
+
+/*
+ * Offset within the xrep_find_ag_btree array for each btree type. Avoid the
+ * XFS_BTNUM_ names here to avoid creating a sparse array.
+ */
+enum {
+ XREP_AGI_INOBT = 0,
+ XREP_AGI_FINOBT,
+ XREP_AGI_END,
+ XREP_AGI_MAX
+};
+
+/*
+ * Given the inode btree roots described by *fab, find the roots, check them
+ * for sanity, and pass the root data back out via *fab.
+ */
+STATIC int
+xrep_agi_find_btrees(
+ struct xfs_scrub *sc,
+ struct xrep_find_ag_btree *fab)
+{
+ struct xfs_buf *agf_bp;
+ struct xfs_mount *mp = sc->mp;
+ int error;
+
+ /* Read the AGF. */
+ error = xfs_alloc_read_agf(mp, sc->tp, sc->sa.agno, 0, &agf_bp);
+ if (error)
+ return error;
+ if (!agf_bp)
+ return -ENOMEM;
+
+ /* Find the btree roots. */
+ error = xrep_find_ag_btree_roots(sc, agf_bp, fab, NULL);
+ if (error)
+ return error;
+
+ /* We must find the inobt root. */
+ if (fab[XREP_AGI_INOBT].root == NULLAGBLOCK ||
+ fab[XREP_AGI_INOBT].height > XFS_BTREE_MAXLEVELS)
+ return -EFSCORRUPTED;
+
+ /* We must find the finobt root if that feature is enabled. */
+ if (xfs_sb_version_hasfinobt(&mp->m_sb) &&
+ (fab[XREP_AGI_FINOBT].root == NULLAGBLOCK ||
+ fab[XREP_AGI_FINOBT].height > XFS_BTREE_MAXLEVELS))
+ return -EFSCORRUPTED;
+
+ return 0;
+}
+
+/*
+ * Reinitialize the AGI header, making an in-core copy of the old contents so
+ * that we know which in-core state needs to be reinitialized.
+ */
+STATIC void
+xrep_agi_init_header(
+ struct xfs_scrub *sc,
+ struct xfs_buf *agi_bp,
+ struct xfs_agi *old_agi)
+{
+ struct xfs_agi *agi = XFS_BUF_TO_AGI(agi_bp);
+ struct xfs_mount *mp = sc->mp;
+
+ memcpy(old_agi, agi, sizeof(*old_agi));
+ memset(agi, 0, BBTOB(agi_bp->b_length));
+ agi->agi_magicnum = cpu_to_be32(XFS_AGI_MAGIC);
+ agi->agi_versionnum = cpu_to_be32(XFS_AGI_VERSION);
+ agi->agi_seqno = cpu_to_be32(sc->sa.agno);
+ agi->agi_length = cpu_to_be32(xfs_ag_block_count(mp, sc->sa.agno));
+ agi->agi_newino = cpu_to_be32(NULLAGINO);
+ agi->agi_dirino = cpu_to_be32(NULLAGINO);
+ if (xfs_sb_version_hascrc(&mp->m_sb))
+ uuid_copy(&agi->agi_uuid, &mp->m_sb.sb_meta_uuid);
+
+ /* We don't know how to fix the unlinked list yet. */
+ memcpy(&agi->agi_unlinked, &old_agi->agi_unlinked,
+ sizeof(agi->agi_unlinked));
+
+ /* Mark the incore AGF data stale until we're done fixing things. */
+ ASSERT(sc->sa.pag->pagi_init);
+ sc->sa.pag->pagi_init = 0;
+}
+
+/* Set btree root information in an AGI. */
+STATIC void
+xrep_agi_set_roots(
+ struct xfs_scrub *sc,
+ struct xfs_agi *agi,
+ struct xrep_find_ag_btree *fab)
+{
+ agi->agi_root = cpu_to_be32(fab[XREP_AGI_INOBT].root);
+ agi->agi_level = cpu_to_be32(fab[XREP_AGI_INOBT].height);
+
+ if (xfs_sb_version_hasfinobt(&sc->mp->m_sb)) {
+ agi->agi_free_root = cpu_to_be32(fab[XREP_AGI_FINOBT].root);
+ agi->agi_free_level = cpu_to_be32(fab[XREP_AGI_FINOBT].height);
+ }
+}
+
+/* Update the AGI counters. */
+STATIC int
+xrep_agi_calc_from_btrees(
+ struct xfs_scrub *sc,
+ struct xfs_buf *agi_bp)
+{
+ struct xfs_btree_cur *cur;
+ struct xfs_agi *agi = XFS_BUF_TO_AGI(agi_bp);
+ struct xfs_mount *mp = sc->mp;
+ xfs_agino_t count;
+ xfs_agino_t freecount;
+ int error;
+
+ cur = xfs_inobt_init_cursor(mp, sc->tp, agi_bp, sc->sa.agno,
+ XFS_BTNUM_INO);
+ error = xfs_ialloc_count_inodes(cur, &count, &freecount);
+ if (error)
+ goto err;
+ xfs_btree_del_cursor(cur, error);
+
+ agi->agi_count = cpu_to_be32(count);
+ agi->agi_freecount = cpu_to_be32(freecount);
+ return 0;
+err:
+ xfs_btree_del_cursor(cur, error);
+ return error;
+}
+
+/* Trigger reinitialization of the in-core data. */
+STATIC int
+xrep_agi_commit_new(
+ struct xfs_scrub *sc,
+ struct xfs_buf *agi_bp)
+{
+ struct xfs_perag *pag;
+ struct xfs_agi *agi = XFS_BUF_TO_AGI(agi_bp);
+
+ /* Trigger inode count recalculation */
+ xfs_force_summary_recalc(sc->mp);
+
+ /* Write this to disk. */
+ xfs_trans_buf_set_type(sc->tp, agi_bp, XFS_BLFT_AGI_BUF);
+ xfs_trans_log_buf(sc->tp, agi_bp, 0, BBTOB(agi_bp->b_length) - 1);
+
+ /* Now reinitialize the in-core counters if necessary. */
+ pag = sc->sa.pag;
+ pag->pagi_count = be32_to_cpu(agi->agi_count);
+ pag->pagi_freecount = be32_to_cpu(agi->agi_freecount);
+ pag->pagi_init = 1;
+
+ return 0;
+}
+
+/* Repair the AGI. */
+int
+xrep_agi(
+ struct xfs_scrub *sc)
+{
+ struct xrep_find_ag_btree fab[XREP_AGI_MAX] = {
+ [XREP_AGI_INOBT] = {
+ .rmap_owner = XFS_RMAP_OWN_INOBT,
+ .buf_ops = &xfs_inobt_buf_ops,
+ .magic = XFS_IBT_CRC_MAGIC,
+ },
+ [XREP_AGI_FINOBT] = {
+ .rmap_owner = XFS_RMAP_OWN_INOBT,
+ .buf_ops = &xfs_inobt_buf_ops,
+ .magic = XFS_FIBT_CRC_MAGIC,
+ },
+ [XREP_AGI_END] = {
+ .buf_ops = NULL
+ },
+ };
+ struct xfs_agi old_agi;
+ struct xfs_mount *mp = sc->mp;
+ struct xfs_buf *agi_bp;
+ struct xfs_agi *agi;
+ int error;
+
+ /* We require the rmapbt to rebuild anything. */
+ if (!xfs_sb_version_hasrmapbt(&mp->m_sb))
+ return -EOPNOTSUPP;
+
+ xchk_perag_get(sc->mp, &sc->sa);
+ /*
+ * Make sure we have the AGI buffer, as scrub might have decided it
+ * was corrupt after xfs_ialloc_read_agi failed with -EFSCORRUPTED.
+ */
+ error = xfs_trans_read_buf(mp, sc->tp, mp->m_ddev_targp,
+ XFS_AG_DADDR(mp, sc->sa.agno, XFS_AGI_DADDR(mp)),
+ XFS_FSS_TO_BB(mp, 1), 0, &agi_bp, NULL);
+ if (error)
+ return error;
+ agi_bp->b_ops = &xfs_agi_buf_ops;
+ agi = XFS_BUF_TO_AGI(agi_bp);
+
+ /* Find the AGI btree roots. */
+ error = xrep_agi_find_btrees(sc, fab);
+ if (error)
+ return error;
+
+ /* Start rewriting the header and implant the btrees we found. */
+ xrep_agi_init_header(sc, agi_bp, &old_agi);
+ xrep_agi_set_roots(sc, agi, fab);
+ error = xrep_agi_calc_from_btrees(sc, agi_bp);
+ if (error)
+ goto out_revert;
+
+ /* Reinitialize in-core state. */
+ return xrep_agi_commit_new(sc, agi_bp);
+
+out_revert:
+ /* Mark the incore AGI state stale and revert the AGI. */
+ sc->sa.pag->pagi_init = 0;
+ memcpy(agi, &old_agi, sizeof(old_agi));
+ return error;
+}
diff --git a/fs/xfs/scrub/repair.h b/fs/xfs/scrub/repair.h
index 1d283360b5ab..9de321eee4ab 100644
--- a/fs/xfs/scrub/repair.h
+++ b/fs/xfs/scrub/repair.h
@@ -60,6 +60,7 @@ int xrep_probe(struct xfs_scrub *sc);
int xrep_superblock(struct xfs_scrub *sc);
int xrep_agf(struct xfs_scrub *sc);
int xrep_agfl(struct xfs_scrub *sc);
+int xrep_agi(struct xfs_scrub *sc);
#else
@@ -85,6 +86,7 @@ xrep_calc_ag_resblks(
#define xrep_superblock xrep_notsupported
#define xrep_agf xrep_notsupported
#define xrep_agfl xrep_notsupported
+#define xrep_agi xrep_notsupported
#endif /* CONFIG_XFS_ONLINE_REPAIR */
diff --git a/fs/xfs/scrub/scrub.c b/fs/xfs/scrub/scrub.c
index 2670f4cf62f4..4bfae1e61d30 100644
--- a/fs/xfs/scrub/scrub.c
+++ b/fs/xfs/scrub/scrub.c
@@ -226,7 +226,7 @@ static const struct xchk_meta_ops meta_scrub_ops[] = {
.type = ST_PERAG,
.setup = xchk_setup_fs,
.scrub = xchk_agi,
- .repair = xrep_notsupported,
+ .repair = xrep_agi,
},
[XFS_SCRUB_TYPE_BNOBT] = { /* bnobt */
.type = ST_PERAG,
--
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