diff options
Diffstat (limited to 'fs/xfs/scrub/ialloc_repair.c')
| -rw-r--r-- | fs/xfs/scrub/ialloc_repair.c | 884 |
1 files changed, 884 insertions, 0 deletions
diff --git a/fs/xfs/scrub/ialloc_repair.c b/fs/xfs/scrub/ialloc_repair.c new file mode 100644 index 0000000000..b3f7182dd2 --- /dev/null +++ b/fs/xfs/scrub/ialloc_repair.c @@ -0,0 +1,884 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (C) 2018-2023 Oracle. All Rights Reserved. + * Author: Darrick J. Wong <djwong@kernel.org> + */ +#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_btree_staging.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 "xfs_ialloc_btree.h" +#include "xfs_icache.h" +#include "xfs_rmap.h" +#include "xfs_rmap_btree.h" +#include "xfs_log.h" +#include "xfs_trans_priv.h" +#include "xfs_error.h" +#include "xfs_health.h" +#include "xfs_ag.h" +#include "scrub/xfs_scrub.h" +#include "scrub/scrub.h" +#include "scrub/common.h" +#include "scrub/btree.h" +#include "scrub/trace.h" +#include "scrub/repair.h" +#include "scrub/bitmap.h" +#include "scrub/agb_bitmap.h" +#include "scrub/xfile.h" +#include "scrub/xfarray.h" +#include "scrub/newbt.h" +#include "scrub/reap.h" + +/* + * Inode Btree Repair + * ================== + * + * A quick refresher of inode btrees on a v5 filesystem: + * + * - Inode records are read into memory in units of 'inode clusters'. However + * many inodes fit in a cluster buffer is the smallest number of inodes that + * can be allocated or freed. Clusters are never smaller than one fs block + * though they can span multiple blocks. The size (in fs blocks) is + * computed with xfs_icluster_size_fsb(). The fs block alignment of a + * cluster is computed with xfs_ialloc_cluster_alignment(). + * + * - Each inode btree record can describe a single 'inode chunk'. The chunk + * size is defined to be 64 inodes. If sparse inodes are enabled, every + * inobt record must be aligned to the chunk size; if not, every record must + * be aligned to the start of a cluster. It is possible to construct an XFS + * geometry where one inobt record maps to multiple inode clusters; it is + * also possible to construct a geometry where multiple inobt records map to + * different parts of one inode cluster. + * + * - If sparse inodes are not enabled, the smallest unit of allocation for + * inode records is enough to contain one inode chunk's worth of inodes. + * + * - If sparse inodes are enabled, the holemask field will be active. Each + * bit of the holemask represents 4 potential inodes; if set, the + * corresponding space does *not* contain inodes and must be left alone. + * Clusters cannot be smaller than 4 inodes. The smallest unit of allocation + * of inode records is one inode cluster. + * + * So what's the rebuild algorithm? + * + * Iterate the reverse mapping records looking for OWN_INODES and OWN_INOBT + * records. The OWN_INOBT records are the old inode btree blocks and will be + * cleared out after we've rebuilt the tree. Each possible inode cluster + * within an OWN_INODES record will be read in; for each possible inobt record + * associated with that cluster, compute the freemask calculated from the + * i_mode data in the inode chunk. For sparse inodes the holemask will be + * calculated by creating the properly aligned inobt record and punching out + * any chunk that's missing. Inode allocations and frees grab the AGI first, + * so repair protects itself from concurrent access by locking the AGI. + * + * Once we've reconstructed all the inode records, we can create new inode + * btree roots and reload the btrees. We rebuild both inode trees at the same + * time because they have the same rmap owner and it would be more complex to + * figure out if the other tree isn't in need of a rebuild and which OWN_INOBT + * blocks it owns. We have all the data we need to build both, so dump + * everything and start over. + * + * We use the prefix 'xrep_ibt' because we rebuild both inode btrees at once. + */ + +struct xrep_ibt { + /* Record under construction. */ + struct xfs_inobt_rec_incore rie; + + /* new inobt information */ + struct xrep_newbt new_inobt; + + /* new finobt information */ + struct xrep_newbt new_finobt; + + /* Old inode btree blocks we found in the rmap. */ + struct xagb_bitmap old_iallocbt_blocks; + + /* Reconstructed inode records. */ + struct xfarray *inode_records; + + struct xfs_scrub *sc; + + /* Number of inodes assigned disk space. */ + unsigned int icount; + + /* Number of inodes in use. */ + unsigned int iused; + + /* Number of finobt records needed. */ + unsigned int finobt_recs; + + /* get_records()'s position in the inode record array. */ + xfarray_idx_t array_cur; +}; + +/* + * Is this inode in use? If the inode is in memory we can tell from i_mode, + * otherwise we have to check di_mode in the on-disk buffer. We only care + * that the high (i.e. non-permission) bits of _mode are zero. This should be + * safe because repair keeps all AG headers locked until the end, and process + * trying to perform an inode allocation/free must lock the AGI. + * + * @cluster_ag_base is the inode offset of the cluster within the AG. + * @cluster_bp is the cluster buffer. + * @cluster_index is the inode offset within the inode cluster. + */ +STATIC int +xrep_ibt_check_ifree( + struct xrep_ibt *ri, + xfs_agino_t cluster_ag_base, + struct xfs_buf *cluster_bp, + unsigned int cluster_index, + bool *inuse) +{ + struct xfs_scrub *sc = ri->sc; + struct xfs_mount *mp = sc->mp; + struct xfs_dinode *dip; + xfs_ino_t fsino; + xfs_agino_t agino; + xfs_agnumber_t agno = ri->sc->sa.pag->pag_agno; + unsigned int cluster_buf_base; + unsigned int offset; + int error; + + agino = cluster_ag_base + cluster_index; + fsino = XFS_AGINO_TO_INO(mp, agno, agino); + + /* Inode uncached or half assembled, read disk buffer */ + cluster_buf_base = XFS_INO_TO_OFFSET(mp, cluster_ag_base); + offset = (cluster_buf_base + cluster_index) * mp->m_sb.sb_inodesize; + if (offset >= BBTOB(cluster_bp->b_length)) + return -EFSCORRUPTED; + dip = xfs_buf_offset(cluster_bp, offset); + if (be16_to_cpu(dip->di_magic) != XFS_DINODE_MAGIC) + return -EFSCORRUPTED; + + if (dip->di_version >= 3 && be64_to_cpu(dip->di_ino) != fsino) + return -EFSCORRUPTED; + + /* Will the in-core inode tell us if it's in use? */ + error = xchk_inode_is_allocated(sc, agino, inuse); + if (!error) + return 0; + + *inuse = dip->di_mode != 0; + return 0; +} + +/* Stash the accumulated inobt record for rebuilding. */ +STATIC int +xrep_ibt_stash( + struct xrep_ibt *ri) +{ + int error = 0; + + if (xchk_should_terminate(ri->sc, &error)) + return error; + + ri->rie.ir_freecount = xfs_inobt_rec_freecount(&ri->rie); + if (xfs_inobt_check_irec(ri->sc->sa.pag, &ri->rie) != NULL) + return -EFSCORRUPTED; + + if (ri->rie.ir_freecount > 0) + ri->finobt_recs++; + + trace_xrep_ibt_found(ri->sc->mp, ri->sc->sa.pag->pag_agno, &ri->rie); + + error = xfarray_append(ri->inode_records, &ri->rie); + if (error) + return error; + + ri->rie.ir_startino = NULLAGINO; + return 0; +} + +/* + * Given an extent of inodes and an inode cluster buffer, calculate the + * location of the corresponding inobt record (creating it if necessary), + * then update the parts of the holemask and freemask of that record that + * correspond to the inode extent we were given. + * + * @cluster_ir_startino is the AG inode number of an inobt record that we're + * proposing to create for this inode cluster. If sparse inodes are enabled, + * we must round down to a chunk boundary to find the actual sparse record. + * @cluster_bp is the buffer of the inode cluster. + * @nr_inodes is the number of inodes to check from the cluster. + */ +STATIC int +xrep_ibt_cluster_record( + struct xrep_ibt *ri, + xfs_agino_t cluster_ir_startino, + struct xfs_buf *cluster_bp, + unsigned int nr_inodes) +{ + struct xfs_scrub *sc = ri->sc; + struct xfs_mount *mp = sc->mp; + xfs_agino_t ir_startino; + unsigned int cluster_base; + unsigned int cluster_index; + int error = 0; + + ir_startino = cluster_ir_startino; + if (xfs_has_sparseinodes(mp)) + ir_startino = rounddown(ir_startino, XFS_INODES_PER_CHUNK); + cluster_base = cluster_ir_startino - ir_startino; + + /* + * If the accumulated inobt record doesn't map this cluster, add it to + * the list and reset it. + */ + if (ri->rie.ir_startino != NULLAGINO && + ri->rie.ir_startino + XFS_INODES_PER_CHUNK <= ir_startino) { + error = xrep_ibt_stash(ri); + if (error) + return error; + } + + if (ri->rie.ir_startino == NULLAGINO) { + ri->rie.ir_startino = ir_startino; + ri->rie.ir_free = XFS_INOBT_ALL_FREE; + ri->rie.ir_holemask = 0xFFFF; + ri->rie.ir_count = 0; + } + + /* Record the whole cluster. */ + ri->icount += nr_inodes; + ri->rie.ir_count += nr_inodes; + ri->rie.ir_holemask &= ~xfs_inobt_maskn( + cluster_base / XFS_INODES_PER_HOLEMASK_BIT, + nr_inodes / XFS_INODES_PER_HOLEMASK_BIT); + + /* Which inodes within this cluster are free? */ + for (cluster_index = 0; cluster_index < nr_inodes; cluster_index++) { + bool inuse = false; + + error = xrep_ibt_check_ifree(ri, cluster_ir_startino, + cluster_bp, cluster_index, &inuse); + if (error) + return error; + if (!inuse) + continue; + ri->iused++; + ri->rie.ir_free &= ~XFS_INOBT_MASK(cluster_base + + cluster_index); + } + return 0; +} + +/* + * For each inode cluster covering the physical extent recorded by the rmapbt, + * we must calculate the properly aligned startino of that cluster, then + * iterate each cluster to fill in used and filled masks appropriately. We + * then use the (startino, used, filled) information to construct the + * appropriate inode records. + */ +STATIC int +xrep_ibt_process_cluster( + struct xrep_ibt *ri, + xfs_agblock_t cluster_bno) +{ + struct xfs_imap imap; + struct xfs_buf *cluster_bp; + struct xfs_scrub *sc = ri->sc; + struct xfs_mount *mp = sc->mp; + struct xfs_ino_geometry *igeo = M_IGEO(mp); + xfs_agino_t cluster_ag_base; + xfs_agino_t irec_index; + unsigned int nr_inodes; + int error; + + nr_inodes = min_t(unsigned int, igeo->inodes_per_cluster, + XFS_INODES_PER_CHUNK); + + /* + * Grab the inode cluster buffer. This is safe to do with a broken + * inobt because imap_to_bp directly maps the buffer without touching + * either inode btree. + */ + imap.im_blkno = XFS_AGB_TO_DADDR(mp, sc->sa.pag->pag_agno, cluster_bno); + imap.im_len = XFS_FSB_TO_BB(mp, igeo->blocks_per_cluster); + imap.im_boffset = 0; + error = xfs_imap_to_bp(mp, sc->tp, &imap, &cluster_bp); + if (error) + return error; + + /* + * Record the contents of each possible inobt record mapping this + * cluster. + */ + cluster_ag_base = XFS_AGB_TO_AGINO(mp, cluster_bno); + for (irec_index = 0; + irec_index < igeo->inodes_per_cluster; + irec_index += XFS_INODES_PER_CHUNK) { + error = xrep_ibt_cluster_record(ri, + cluster_ag_base + irec_index, cluster_bp, + nr_inodes); + if (error) + break; + + } + + xfs_trans_brelse(sc->tp, cluster_bp); + return error; +} + +/* Check for any obvious conflicts in the inode chunk extent. */ +STATIC int +xrep_ibt_check_inode_ext( + struct xfs_scrub *sc, + xfs_agblock_t agbno, + xfs_extlen_t len) +{ + struct xfs_mount *mp = sc->mp; + struct xfs_ino_geometry *igeo = M_IGEO(mp); + xfs_agino_t agino; + enum xbtree_recpacking outcome; + int error; + + /* Inode records must be within the AG. */ + if (!xfs_verify_agbext(sc->sa.pag, agbno, len)) + return -EFSCORRUPTED; + + /* The entire record must align to the inode cluster size. */ + if (!IS_ALIGNED(agbno, igeo->blocks_per_cluster) || + !IS_ALIGNED(agbno + len, igeo->blocks_per_cluster)) + return -EFSCORRUPTED; + + /* + * The entire record must also adhere to the inode cluster alignment + * size if sparse inodes are not enabled. + */ + if (!xfs_has_sparseinodes(mp) && + (!IS_ALIGNED(agbno, igeo->cluster_align) || + !IS_ALIGNED(agbno + len, igeo->cluster_align))) + return -EFSCORRUPTED; + + /* + * On a sparse inode fs, this cluster could be part of a sparse chunk. + * Sparse clusters must be aligned to sparse chunk alignment. + */ + if (xfs_has_sparseinodes(mp) && + (!IS_ALIGNED(agbno, mp->m_sb.sb_spino_align) || + !IS_ALIGNED(agbno + len, mp->m_sb.sb_spino_align))) + return -EFSCORRUPTED; + + /* Make sure the entire range of blocks are valid AG inodes. */ + agino = XFS_AGB_TO_AGINO(mp, agbno); + if (!xfs_verify_agino(sc->sa.pag, agino)) + return -EFSCORRUPTED; + + agino = XFS_AGB_TO_AGINO(mp, agbno + len) - 1; + if (!xfs_verify_agino(sc->sa.pag, agino)) + return -EFSCORRUPTED; + + /* Make sure this isn't free space. */ + error = xfs_alloc_has_records(sc->sa.bno_cur, agbno, len, &outcome); + if (error) + return error; + if (outcome != XBTREE_RECPACKING_EMPTY) + return -EFSCORRUPTED; + + return 0; +} + +/* Found a fragment of the old inode btrees; dispose of them later. */ +STATIC int +xrep_ibt_record_old_btree_blocks( + struct xrep_ibt *ri, + const struct xfs_rmap_irec *rec) +{ + if (!xfs_verify_agbext(ri->sc->sa.pag, rec->rm_startblock, + rec->rm_blockcount)) + return -EFSCORRUPTED; + + return xagb_bitmap_set(&ri->old_iallocbt_blocks, rec->rm_startblock, + rec->rm_blockcount); +} + +/* Record extents that belong to inode cluster blocks. */ +STATIC int +xrep_ibt_record_inode_blocks( + struct xrep_ibt *ri, + const struct xfs_rmap_irec *rec) +{ + struct xfs_mount *mp = ri->sc->mp; + struct xfs_ino_geometry *igeo = M_IGEO(mp); + xfs_agblock_t cluster_base; + int error; + + error = xrep_ibt_check_inode_ext(ri->sc, rec->rm_startblock, + rec->rm_blockcount); + if (error) + return error; + + trace_xrep_ibt_walk_rmap(mp, ri->sc->sa.pag->pag_agno, + rec->rm_startblock, rec->rm_blockcount, rec->rm_owner, + rec->rm_offset, rec->rm_flags); + + /* + * Record the free/hole masks for each inode cluster that could be + * mapped by this rmap record. + */ + for (cluster_base = 0; + cluster_base < rec->rm_blockcount; + cluster_base += igeo->blocks_per_cluster) { + error = xrep_ibt_process_cluster(ri, + rec->rm_startblock + cluster_base); + if (error) + return error; + } + + return 0; +} + +STATIC int +xrep_ibt_walk_rmap( + struct xfs_btree_cur *cur, + const struct xfs_rmap_irec *rec, + void *priv) +{ + struct xrep_ibt *ri = priv; + int error = 0; + + if (xchk_should_terminate(ri->sc, &error)) + return error; + + switch (rec->rm_owner) { + case XFS_RMAP_OWN_INOBT: + return xrep_ibt_record_old_btree_blocks(ri, rec); + case XFS_RMAP_OWN_INODES: + return xrep_ibt_record_inode_blocks(ri, rec); + } + return 0; +} + +/* + * Iterate all reverse mappings to find the inodes (OWN_INODES) and the inode + * btrees (OWN_INOBT). Figure out if we have enough free space to reconstruct + * the inode btrees. The caller must clean up the lists if anything goes + * wrong. + */ +STATIC int +xrep_ibt_find_inodes( + struct xrep_ibt *ri) +{ + struct xfs_scrub *sc = ri->sc; + int error; + + ri->rie.ir_startino = NULLAGINO; + + /* Collect all reverse mappings for inode blocks. */ + xrep_ag_btcur_init(sc, &sc->sa); + error = xfs_rmap_query_all(sc->sa.rmap_cur, xrep_ibt_walk_rmap, ri); + xchk_ag_btcur_free(&sc->sa); + if (error) + return error; + + /* If we have a record ready to go, add it to the array. */ + if (ri->rie.ir_startino != NULLAGINO) + return xrep_ibt_stash(ri); + + return 0; +} + +/* Update the AGI counters. */ +STATIC int +xrep_ibt_reset_counters( + struct xrep_ibt *ri) +{ + struct xfs_scrub *sc = ri->sc; + struct xfs_agi *agi = sc->sa.agi_bp->b_addr; + unsigned int freecount = ri->icount - ri->iused; + + /* Trigger inode count recalculation */ + xfs_force_summary_recalc(sc->mp); + + /* + * The AGI header contains extra information related to the inode + * btrees, so we must update those fields here. + */ + agi->agi_count = cpu_to_be32(ri->icount); + agi->agi_freecount = cpu_to_be32(freecount); + xfs_ialloc_log_agi(sc->tp, sc->sa.agi_bp, + XFS_AGI_COUNT | XFS_AGI_FREECOUNT); + + /* Reinitialize with the values we just logged. */ + return xrep_reinit_pagi(sc); +} + +/* Retrieve finobt data for bulk load. */ +STATIC int +xrep_fibt_get_records( + struct xfs_btree_cur *cur, + unsigned int idx, + struct xfs_btree_block *block, + unsigned int nr_wanted, + void *priv) +{ + struct xfs_inobt_rec_incore *irec = &cur->bc_rec.i; + struct xrep_ibt *ri = priv; + union xfs_btree_rec *block_rec; + unsigned int loaded; + int error; + + for (loaded = 0; loaded < nr_wanted; loaded++, idx++) { + do { + error = xfarray_load(ri->inode_records, + ri->array_cur++, irec); + } while (error == 0 && xfs_inobt_rec_freecount(irec) == 0); + if (error) + return error; + + block_rec = xfs_btree_rec_addr(cur, idx, block); + cur->bc_ops->init_rec_from_cur(cur, block_rec); + } + + return loaded; +} + +/* Retrieve inobt data for bulk load. */ +STATIC int +xrep_ibt_get_records( + struct xfs_btree_cur *cur, + unsigned int idx, + struct xfs_btree_block *block, + unsigned int nr_wanted, + void *priv) +{ + struct xfs_inobt_rec_incore *irec = &cur->bc_rec.i; + struct xrep_ibt *ri = priv; + union xfs_btree_rec *block_rec; + unsigned int loaded; + int error; + + for (loaded = 0; loaded < nr_wanted; loaded++, idx++) { + error = xfarray_load(ri->inode_records, ri->array_cur++, irec); + if (error) + return error; + + block_rec = xfs_btree_rec_addr(cur, idx, block); + cur->bc_ops->init_rec_from_cur(cur, block_rec); + } + + return loaded; +} + +/* Feed one of the new inobt blocks to the bulk loader. */ +STATIC int +xrep_ibt_claim_block( + struct xfs_btree_cur *cur, + union xfs_btree_ptr *ptr, + void *priv) +{ + struct xrep_ibt *ri = priv; + + return xrep_newbt_claim_block(cur, &ri->new_inobt, ptr); +} + +/* Feed one of the new finobt blocks to the bulk loader. */ +STATIC int +xrep_fibt_claim_block( + struct xfs_btree_cur *cur, + union xfs_btree_ptr *ptr, + void *priv) +{ + struct xrep_ibt *ri = priv; + + return xrep_newbt_claim_block(cur, &ri->new_finobt, ptr); +} + +/* Make sure the records do not overlap in inumber address space. */ +STATIC int +xrep_ibt_check_overlap( + struct xrep_ibt *ri) +{ + struct xfs_inobt_rec_incore irec; + xfarray_idx_t cur; + xfs_agino_t next_agino = 0; + int error = 0; + + foreach_xfarray_idx(ri->inode_records, cur) { + if (xchk_should_terminate(ri->sc, &error)) + return error; + + error = xfarray_load(ri->inode_records, cur, &irec); + if (error) + return error; + + if (irec.ir_startino < next_agino) + return -EFSCORRUPTED; + + next_agino = irec.ir_startino + XFS_INODES_PER_CHUNK; + } + + return error; +} + +/* Build new inode btrees and dispose of the old one. */ +STATIC int +xrep_ibt_build_new_trees( + struct xrep_ibt *ri) +{ + struct xfs_scrub *sc = ri->sc; + struct xfs_btree_cur *ino_cur; + struct xfs_btree_cur *fino_cur = NULL; + xfs_fsblock_t fsbno; + bool need_finobt; + int error; + + need_finobt = xfs_has_finobt(sc->mp); + + /* + * Create new btrees for staging all the inobt records we collected + * earlier. The records were collected in order of increasing agino, + * so we do not have to sort them. Ensure there are no overlapping + * records. + */ + error = xrep_ibt_check_overlap(ri); + if (error) + return error; + + /* + * The new inode btrees will not be rooted in the AGI until we've + * successfully rebuilt the tree. + * + * Start by setting up the inobt staging cursor. + */ + fsbno = XFS_AGB_TO_FSB(sc->mp, sc->sa.pag->pag_agno, + XFS_IBT_BLOCK(sc->mp)), + xrep_newbt_init_ag(&ri->new_inobt, sc, &XFS_RMAP_OINFO_INOBT, fsbno, + XFS_AG_RESV_NONE); + ri->new_inobt.bload.claim_block = xrep_ibt_claim_block; + ri->new_inobt.bload.get_records = xrep_ibt_get_records; + + ino_cur = xfs_inobt_stage_cursor(sc->sa.pag, &ri->new_inobt.afake, + XFS_BTNUM_INO); + error = xfs_btree_bload_compute_geometry(ino_cur, &ri->new_inobt.bload, + xfarray_length(ri->inode_records)); + if (error) + goto err_inocur; + + /* Set up finobt staging cursor. */ + if (need_finobt) { + enum xfs_ag_resv_type resv = XFS_AG_RESV_METADATA; + + if (sc->mp->m_finobt_nores) + resv = XFS_AG_RESV_NONE; + + fsbno = XFS_AGB_TO_FSB(sc->mp, sc->sa.pag->pag_agno, + XFS_FIBT_BLOCK(sc->mp)), + xrep_newbt_init_ag(&ri->new_finobt, sc, &XFS_RMAP_OINFO_INOBT, + fsbno, resv); + ri->new_finobt.bload.claim_block = xrep_fibt_claim_block; + ri->new_finobt.bload.get_records = xrep_fibt_get_records; + + fino_cur = xfs_inobt_stage_cursor(sc->sa.pag, + &ri->new_finobt.afake, XFS_BTNUM_FINO); + error = xfs_btree_bload_compute_geometry(fino_cur, + &ri->new_finobt.bload, ri->finobt_recs); + if (error) + goto err_finocur; + } + + /* Last chance to abort before we start committing fixes. */ + if (xchk_should_terminate(sc, &error)) + goto err_finocur; + + /* Reserve all the space we need to build the new btrees. */ + error = xrep_newbt_alloc_blocks(&ri->new_inobt, + ri->new_inobt.bload.nr_blocks); + if (error) + goto err_finocur; + + if (need_finobt) { + error = xrep_newbt_alloc_blocks(&ri->new_finobt, + ri->new_finobt.bload.nr_blocks); + if (error) + goto err_finocur; + } + + /* Add all inobt records. */ + ri->array_cur = XFARRAY_CURSOR_INIT; + error = xfs_btree_bload(ino_cur, &ri->new_inobt.bload, ri); + if (error) + goto err_finocur; + + /* Add all finobt records. */ + if (need_finobt) { + ri->array_cur = XFARRAY_CURSOR_INIT; + error = xfs_btree_bload(fino_cur, &ri->new_finobt.bload, ri); + if (error) + goto err_finocur; + } + + /* + * Install the new btrees in the AG header. After this point the old + * btrees are no longer accessible and the new trees are live. + */ + xfs_inobt_commit_staged_btree(ino_cur, sc->tp, sc->sa.agi_bp); + xfs_btree_del_cursor(ino_cur, 0); + + if (fino_cur) { + xfs_inobt_commit_staged_btree(fino_cur, sc->tp, sc->sa.agi_bp); + xfs_btree_del_cursor(fino_cur, 0); + } + + /* Reset the AGI counters now that we've changed the inode roots. */ + error = xrep_ibt_reset_counters(ri); + if (error) + goto err_finobt; + + /* Free unused blocks and bitmap. */ + if (need_finobt) { + error = xrep_newbt_commit(&ri->new_finobt); + if (error) + goto err_inobt; + } + error = xrep_newbt_commit(&ri->new_inobt); + if (error) + return error; + + return xrep_roll_ag_trans(sc); + +err_finocur: + if (need_finobt) + xfs_btree_del_cursor(fino_cur, error); +err_inocur: + xfs_btree_del_cursor(ino_cur, error); +err_finobt: + if (need_finobt) + xrep_newbt_cancel(&ri->new_finobt); +err_inobt: + xrep_newbt_cancel(&ri->new_inobt); + return error; +} + +/* + * Now that we've logged the roots of the new btrees, invalidate all of the + * old blocks and free them. + */ +STATIC int +xrep_ibt_remove_old_trees( + struct xrep_ibt *ri) +{ + struct xfs_scrub *sc = ri->sc; + int error; + + /* + * Free the old inode btree blocks if they're not in use. It's ok to + * reap with XFS_AG_RESV_NONE even if the finobt had a per-AG + * reservation because we reset the reservation before releasing the + * AGI and AGF header buffer locks. + */ + error = xrep_reap_agblocks(sc, &ri->old_iallocbt_blocks, + &XFS_RMAP_OINFO_INOBT, XFS_AG_RESV_NONE); + if (error) + return error; + + /* + * If the finobt is enabled and has a per-AG reservation, make sure we + * reinitialize the per-AG reservations. + */ + if (xfs_has_finobt(sc->mp) && !sc->mp->m_finobt_nores) + sc->flags |= XREP_RESET_PERAG_RESV; + + return 0; +} + +/* Repair both inode btrees. */ +int +xrep_iallocbt( + struct xfs_scrub *sc) +{ + struct xrep_ibt *ri; + struct xfs_mount *mp = sc->mp; + char *descr; + xfs_agino_t first_agino, last_agino; + int error = 0; + + /* We require the rmapbt to rebuild anything. */ + if (!xfs_has_rmapbt(mp)) + return -EOPNOTSUPP; + + ri = kzalloc(sizeof(struct xrep_ibt), XCHK_GFP_FLAGS); + if (!ri) + return -ENOMEM; + ri->sc = sc; + + /* We rebuild both inode btrees. */ + sc->sick_mask = XFS_SICK_AG_INOBT | XFS_SICK_AG_FINOBT; + + /* Set up enough storage to handle an AG with nothing but inodes. */ + xfs_agino_range(mp, sc->sa.pag->pag_agno, &first_agino, &last_agino); + last_agino /= XFS_INODES_PER_CHUNK; + descr = xchk_xfile_ag_descr(sc, "inode index records"); + error = xfarray_create(descr, last_agino, + sizeof(struct xfs_inobt_rec_incore), + &ri->inode_records); + kfree(descr); + if (error) + goto out_ri; + + /* Collect the inode data and find the old btree blocks. */ + xagb_bitmap_init(&ri->old_iallocbt_blocks); + error = xrep_ibt_find_inodes(ri); + if (error) + goto out_bitmap; + + /* Rebuild the inode indexes. */ + error = xrep_ibt_build_new_trees(ri); + if (error) + goto out_bitmap; + + /* Kill the old tree. */ + error = xrep_ibt_remove_old_trees(ri); + if (error) + goto out_bitmap; + +out_bitmap: + xagb_bitmap_destroy(&ri->old_iallocbt_blocks); + xfarray_destroy(ri->inode_records); +out_ri: + kfree(ri); + return error; +} + +/* Make sure both btrees are ok after we've rebuilt them. */ +int +xrep_revalidate_iallocbt( + struct xfs_scrub *sc) +{ + __u32 old_type = sc->sm->sm_type; + int error; + + /* + * We must update sm_type temporarily so that the tree-to-tree cross + * reference checks will work in the correct direction, and also so + * that tracing will report correctly if there are more errors. + */ + sc->sm->sm_type = XFS_SCRUB_TYPE_INOBT; + error = xchk_iallocbt(sc); + if (error) + goto out; + + if (xfs_has_finobt(sc->mp)) { + sc->sm->sm_type = XFS_SCRUB_TYPE_FINOBT; + error = xchk_iallocbt(sc); + } + +out: + sc->sm->sm_type = old_type; + return error; +} |