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xfs: repair the AGI
Rebuild the AGI header items with some help from the rmapbt. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Brian Foster <bfoster@redhat.com>
This commit is contained in:
Darrick J. Wong
parent
0e93d3f43e
commit
13942aa94a
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@ -714,3 +714,220 @@ err:
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xfs_bitmap_destroy(&agfl_extents);
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return error;
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}
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/* AGI */
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/*
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* Offset within the xrep_find_ag_btree array for each btree type. Avoid the
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* XFS_BTNUM_ names here to avoid creating a sparse array.
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*/
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enum {
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XREP_AGI_INOBT = 0,
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XREP_AGI_FINOBT,
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XREP_AGI_END,
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XREP_AGI_MAX
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};
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/*
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* Given the inode btree roots described by *fab, find the roots, check them
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* for sanity, and pass the root data back out via *fab.
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*/
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STATIC int
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xrep_agi_find_btrees(
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struct xfs_scrub *sc,
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struct xrep_find_ag_btree *fab)
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{
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struct xfs_buf *agf_bp;
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struct xfs_mount *mp = sc->mp;
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int error;
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/* Read the AGF. */
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error = xfs_alloc_read_agf(mp, sc->tp, sc->sa.agno, 0, &agf_bp);
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if (error)
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return error;
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if (!agf_bp)
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return -ENOMEM;
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/* Find the btree roots. */
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error = xrep_find_ag_btree_roots(sc, agf_bp, fab, NULL);
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if (error)
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return error;
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/* We must find the inobt root. */
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if (!xrep_check_btree_root(sc, &fab[XREP_AGI_INOBT]))
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return -EFSCORRUPTED;
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/* We must find the finobt root if that feature is enabled. */
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if (xfs_sb_version_hasfinobt(&mp->m_sb) &&
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!xrep_check_btree_root(sc, &fab[XREP_AGI_FINOBT]))
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return -EFSCORRUPTED;
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return 0;
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}
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/*
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* Reinitialize the AGI header, making an in-core copy of the old contents so
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* that we know which in-core state needs to be reinitialized.
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*/
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STATIC void
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xrep_agi_init_header(
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struct xfs_scrub *sc,
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struct xfs_buf *agi_bp,
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struct xfs_agi *old_agi)
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{
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struct xfs_agi *agi = XFS_BUF_TO_AGI(agi_bp);
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struct xfs_mount *mp = sc->mp;
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memcpy(old_agi, agi, sizeof(*old_agi));
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memset(agi, 0, BBTOB(agi_bp->b_length));
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agi->agi_magicnum = cpu_to_be32(XFS_AGI_MAGIC);
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agi->agi_versionnum = cpu_to_be32(XFS_AGI_VERSION);
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agi->agi_seqno = cpu_to_be32(sc->sa.agno);
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agi->agi_length = cpu_to_be32(xfs_ag_block_count(mp, sc->sa.agno));
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agi->agi_newino = cpu_to_be32(NULLAGINO);
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agi->agi_dirino = cpu_to_be32(NULLAGINO);
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if (xfs_sb_version_hascrc(&mp->m_sb))
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uuid_copy(&agi->agi_uuid, &mp->m_sb.sb_meta_uuid);
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/* We don't know how to fix the unlinked list yet. */
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memcpy(&agi->agi_unlinked, &old_agi->agi_unlinked,
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sizeof(agi->agi_unlinked));
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/* Mark the incore AGF data stale until we're done fixing things. */
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ASSERT(sc->sa.pag->pagi_init);
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sc->sa.pag->pagi_init = 0;
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}
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/* Set btree root information in an AGI. */
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STATIC void
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xrep_agi_set_roots(
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struct xfs_scrub *sc,
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struct xfs_agi *agi,
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struct xrep_find_ag_btree *fab)
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{
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agi->agi_root = cpu_to_be32(fab[XREP_AGI_INOBT].root);
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agi->agi_level = cpu_to_be32(fab[XREP_AGI_INOBT].height);
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if (xfs_sb_version_hasfinobt(&sc->mp->m_sb)) {
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agi->agi_free_root = cpu_to_be32(fab[XREP_AGI_FINOBT].root);
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agi->agi_free_level = cpu_to_be32(fab[XREP_AGI_FINOBT].height);
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}
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}
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/* Update the AGI counters. */
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STATIC int
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xrep_agi_calc_from_btrees(
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struct xfs_scrub *sc,
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struct xfs_buf *agi_bp)
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{
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struct xfs_btree_cur *cur;
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struct xfs_agi *agi = XFS_BUF_TO_AGI(agi_bp);
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struct xfs_mount *mp = sc->mp;
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xfs_agino_t count;
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xfs_agino_t freecount;
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int error;
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cur = xfs_inobt_init_cursor(mp, sc->tp, agi_bp, sc->sa.agno,
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XFS_BTNUM_INO);
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error = xfs_ialloc_count_inodes(cur, &count, &freecount);
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if (error)
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goto err;
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xfs_btree_del_cursor(cur, error);
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agi->agi_count = cpu_to_be32(count);
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agi->agi_freecount = cpu_to_be32(freecount);
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return 0;
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err:
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xfs_btree_del_cursor(cur, error);
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return error;
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}
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/* Trigger reinitialization of the in-core data. */
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STATIC int
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xrep_agi_commit_new(
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struct xfs_scrub *sc,
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struct xfs_buf *agi_bp)
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{
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struct xfs_perag *pag;
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struct xfs_agi *agi = XFS_BUF_TO_AGI(agi_bp);
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/* Trigger inode count recalculation */
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xfs_force_summary_recalc(sc->mp);
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/* Write this to disk. */
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xfs_trans_buf_set_type(sc->tp, agi_bp, XFS_BLFT_AGI_BUF);
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xfs_trans_log_buf(sc->tp, agi_bp, 0, BBTOB(agi_bp->b_length) - 1);
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/* Now reinitialize the in-core counters if necessary. */
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pag = sc->sa.pag;
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pag->pagi_count = be32_to_cpu(agi->agi_count);
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pag->pagi_freecount = be32_to_cpu(agi->agi_freecount);
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pag->pagi_init = 1;
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return 0;
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}
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/* Repair the AGI. */
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int
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xrep_agi(
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struct xfs_scrub *sc)
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{
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struct xrep_find_ag_btree fab[XREP_AGI_MAX] = {
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[XREP_AGI_INOBT] = {
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.rmap_owner = XFS_RMAP_OWN_INOBT,
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.buf_ops = &xfs_inobt_buf_ops,
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.magic = XFS_IBT_CRC_MAGIC,
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},
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[XREP_AGI_FINOBT] = {
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.rmap_owner = XFS_RMAP_OWN_INOBT,
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.buf_ops = &xfs_inobt_buf_ops,
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.magic = XFS_FIBT_CRC_MAGIC,
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},
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[XREP_AGI_END] = {
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.buf_ops = NULL
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},
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};
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struct xfs_agi old_agi;
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struct xfs_mount *mp = sc->mp;
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struct xfs_buf *agi_bp;
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struct xfs_agi *agi;
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int error;
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/* We require the rmapbt to rebuild anything. */
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if (!xfs_sb_version_hasrmapbt(&mp->m_sb))
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return -EOPNOTSUPP;
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xchk_perag_get(sc->mp, &sc->sa);
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/*
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* Make sure we have the AGI buffer, as scrub might have decided it
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* was corrupt after xfs_ialloc_read_agi failed with -EFSCORRUPTED.
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*/
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error = xfs_trans_read_buf(mp, sc->tp, mp->m_ddev_targp,
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XFS_AG_DADDR(mp, sc->sa.agno, XFS_AGI_DADDR(mp)),
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XFS_FSS_TO_BB(mp, 1), 0, &agi_bp, NULL);
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if (error)
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return error;
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agi_bp->b_ops = &xfs_agi_buf_ops;
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agi = XFS_BUF_TO_AGI(agi_bp);
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/* Find the AGI btree roots. */
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error = xrep_agi_find_btrees(sc, fab);
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if (error)
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return error;
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/* Start rewriting the header and implant the btrees we found. */
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xrep_agi_init_header(sc, agi_bp, &old_agi);
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xrep_agi_set_roots(sc, agi, fab);
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error = xrep_agi_calc_from_btrees(sc, agi_bp);
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if (error)
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goto out_revert;
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/* Reinitialize in-core state. */
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return xrep_agi_commit_new(sc, agi_bp);
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out_revert:
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/* Mark the incore AGI state stale and revert the AGI. */
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sc->sa.pag->pagi_init = 0;
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memcpy(agi, &old_agi, sizeof(old_agi));
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return error;
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}
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@ -60,6 +60,7 @@ int xrep_probe(struct xfs_scrub *sc);
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int xrep_superblock(struct xfs_scrub *sc);
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int xrep_agf(struct xfs_scrub *sc);
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int xrep_agfl(struct xfs_scrub *sc);
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int xrep_agi(struct xfs_scrub *sc);
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#else
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@ -85,6 +86,7 @@ xrep_calc_ag_resblks(
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#define xrep_superblock xrep_notsupported
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#define xrep_agf xrep_notsupported
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#define xrep_agfl xrep_notsupported
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#define xrep_agi xrep_notsupported
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#endif /* CONFIG_XFS_ONLINE_REPAIR */
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@ -226,7 +226,7 @@ static const struct xchk_meta_ops meta_scrub_ops[] = {
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.type = ST_PERAG,
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.setup = xchk_setup_fs,
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.scrub = xchk_agi,
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.repair = xrep_notsupported,
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.repair = xrep_agi,
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},
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[XFS_SCRUB_TYPE_BNOBT] = { /* bnobt */
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.type = ST_PERAG,
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