linux/fs/xfs/scrub/alloc.c
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   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * Copyright (C) 2017 Oracle.  All Rights Reserved.
   4 * Author: Darrick J. Wong <darrick.wong@oracle.com>
   5 */
   6#include "xfs.h"
   7#include "xfs_fs.h"
   8#include "xfs_shared.h"
   9#include "xfs_format.h"
  10#include "xfs_trans_resv.h"
  11#include "xfs_mount.h"
  12#include "xfs_btree.h"
  13#include "xfs_alloc.h"
  14#include "xfs_rmap.h"
  15#include "scrub/scrub.h"
  16#include "scrub/common.h"
  17#include "scrub/btree.h"
  18#include "xfs_ag.h"
  19
  20/*
  21 * Set us up to scrub free space btrees.
  22 */
  23int
  24xchk_setup_ag_allocbt(
  25        struct xfs_scrub        *sc)
  26{
  27        return xchk_setup_ag_btree(sc, false);
  28}
  29
  30/* Free space btree scrubber. */
  31/*
  32 * Ensure there's a corresponding cntbt/bnobt record matching this
  33 * bnobt/cntbt record, respectively.
  34 */
  35STATIC void
  36xchk_allocbt_xref_other(
  37        struct xfs_scrub        *sc,
  38        xfs_agblock_t           agbno,
  39        xfs_extlen_t            len)
  40{
  41        struct xfs_btree_cur    **pcur;
  42        xfs_agblock_t           fbno;
  43        xfs_extlen_t            flen;
  44        int                     has_otherrec;
  45        int                     error;
  46
  47        if (sc->sm->sm_type == XFS_SCRUB_TYPE_BNOBT)
  48                pcur = &sc->sa.cnt_cur;
  49        else
  50                pcur = &sc->sa.bno_cur;
  51        if (!*pcur || xchk_skip_xref(sc->sm))
  52                return;
  53
  54        error = xfs_alloc_lookup_le(*pcur, agbno, len, &has_otherrec);
  55        if (!xchk_should_check_xref(sc, &error, pcur))
  56                return;
  57        if (!has_otherrec) {
  58                xchk_btree_xref_set_corrupt(sc, *pcur, 0);
  59                return;
  60        }
  61
  62        error = xfs_alloc_get_rec(*pcur, &fbno, &flen, &has_otherrec);
  63        if (!xchk_should_check_xref(sc, &error, pcur))
  64                return;
  65        if (!has_otherrec) {
  66                xchk_btree_xref_set_corrupt(sc, *pcur, 0);
  67                return;
  68        }
  69
  70        if (fbno != agbno || flen != len)
  71                xchk_btree_xref_set_corrupt(sc, *pcur, 0);
  72}
  73
  74/* Cross-reference with the other btrees. */
  75STATIC void
  76xchk_allocbt_xref(
  77        struct xfs_scrub        *sc,
  78        xfs_agblock_t           agbno,
  79        xfs_extlen_t            len)
  80{
  81        if (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)
  82                return;
  83
  84        xchk_allocbt_xref_other(sc, agbno, len);
  85        xchk_xref_is_not_inode_chunk(sc, agbno, len);
  86        xchk_xref_has_no_owner(sc, agbno, len);
  87        xchk_xref_is_not_shared(sc, agbno, len);
  88}
  89
  90/* Scrub a bnobt/cntbt record. */
  91STATIC int
  92xchk_allocbt_rec(
  93        struct xchk_btree       *bs,
  94        union xfs_btree_rec     *rec)
  95{
  96        struct xfs_mount        *mp = bs->cur->bc_mp;
  97        xfs_agnumber_t          agno = bs->cur->bc_ag.pag->pag_agno;
  98        xfs_agblock_t           bno;
  99        xfs_extlen_t            len;
 100
 101        bno = be32_to_cpu(rec->alloc.ar_startblock);
 102        len = be32_to_cpu(rec->alloc.ar_blockcount);
 103
 104        if (bno + len <= bno ||
 105            !xfs_verify_agbno(mp, agno, bno) ||
 106            !xfs_verify_agbno(mp, agno, bno + len - 1))
 107                xchk_btree_set_corrupt(bs->sc, bs->cur, 0);
 108
 109        xchk_allocbt_xref(bs->sc, bno, len);
 110
 111        return 0;
 112}
 113
 114/* Scrub the freespace btrees for some AG. */
 115STATIC int
 116xchk_allocbt(
 117        struct xfs_scrub        *sc,
 118        xfs_btnum_t             which)
 119{
 120        struct xfs_btree_cur    *cur;
 121
 122        cur = which == XFS_BTNUM_BNO ? sc->sa.bno_cur : sc->sa.cnt_cur;
 123        return xchk_btree(sc, cur, xchk_allocbt_rec, &XFS_RMAP_OINFO_AG, NULL);
 124}
 125
 126int
 127xchk_bnobt(
 128        struct xfs_scrub        *sc)
 129{
 130        return xchk_allocbt(sc, XFS_BTNUM_BNO);
 131}
 132
 133int
 134xchk_cntbt(
 135        struct xfs_scrub        *sc)
 136{
 137        return xchk_allocbt(sc, XFS_BTNUM_CNT);
 138}
 139
 140/* xref check that the extent is not free */
 141void
 142xchk_xref_is_used_space(
 143        struct xfs_scrub        *sc,
 144        xfs_agblock_t           agbno,
 145        xfs_extlen_t            len)
 146{
 147        bool                    is_freesp;
 148        int                     error;
 149
 150        if (!sc->sa.bno_cur || xchk_skip_xref(sc->sm))
 151                return;
 152
 153        error = xfs_alloc_has_record(sc->sa.bno_cur, agbno, len, &is_freesp);
 154        if (!xchk_should_check_xref(sc, &error, &sc->sa.bno_cur))
 155                return;
 156        if (is_freesp)
 157                xchk_btree_xref_set_corrupt(sc, sc->sa.bno_cur, 0);
 158}
 159