LXR linux/fs/xfs/scrub/alloc.c

   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_defer.h"
  13#include "xfs_btree.h"
  14#include "xfs_bit.h"
  15#include "xfs_log_format.h"
  16#include "xfs_trans.h"
  17#include "xfs_sb.h"
  18#include "xfs_alloc.h"
  19#include "xfs_rmap.h"
  20#include "scrub/xfs_scrub.h"
  21#include "scrub/scrub.h"
  22#include "scrub/common.h"
  23#include "scrub/btree.h"
  24#include "scrub/trace.h"
  25
  26/*
  27 * Set us up to scrub free space btrees.
  28 */
  29int
  30xchk_setup_ag_allocbt(
  31        struct xfs_scrub        *sc,
  32        struct xfs_inode        *ip)
  33{
  34        return xchk_setup_ag_btree(sc, ip, false);
  35}
  36
  37/* Free space btree scrubber. */
  38/*
  39 * Ensure there's a corresponding cntbt/bnobt record matching this
  40 * bnobt/cntbt record, respectively.
  41 */
  42STATIC void
  43xchk_allocbt_xref_other(
  44        struct xfs_scrub        *sc,
  45        xfs_agblock_t           agbno,
  46        xfs_extlen_t            len)
  47{
  48        struct xfs_btree_cur    **pcur;
  49        xfs_agblock_t           fbno;
  50        xfs_extlen_t            flen;
  51        int                     has_otherrec;
  52        int                     error;
  53
  54        if (sc->sm->sm_type == XFS_SCRUB_TYPE_BNOBT)
  55                pcur = &sc->sa.cnt_cur;
  56        else
  57                pcur = &sc->sa.bno_cur;
  58        if (!*pcur || xchk_skip_xref(sc->sm))
  59                return;
  60
  61        error = xfs_alloc_lookup_le(*pcur, agbno, len, &has_otherrec);
  62        if (!xchk_should_check_xref(sc, &error, pcur))
  63                return;
  64        if (!has_otherrec) {
  65                xchk_btree_xref_set_corrupt(sc, *pcur, 0);
  66                return;
  67        }
  68
  69        error = xfs_alloc_get_rec(*pcur, &fbno, &flen, &has_otherrec);
  70        if (!xchk_should_check_xref(sc, &error, pcur))
  71                return;
  72        if (!has_otherrec) {
  73                xchk_btree_xref_set_corrupt(sc, *pcur, 0);
  74                return;
  75        }
  76
  77        if (fbno != agbno || flen != len)
  78                xchk_btree_xref_set_corrupt(sc, *pcur, 0);
  79}
  80
  81/* Cross-reference with the other btrees. */
  82STATIC void
  83xchk_allocbt_xref(
  84        struct xfs_scrub        *sc,
  85        xfs_agblock_t           agbno,
  86        xfs_extlen_t            len)
  87{
  88        if (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)
  89                return;
  90
  91        xchk_allocbt_xref_other(sc, agbno, len);
  92        xchk_xref_is_not_inode_chunk(sc, agbno, len);
  93        xchk_xref_has_no_owner(sc, agbno, len);
  94        xchk_xref_is_not_shared(sc, agbno, len);
  95}
  96
  97/* Scrub a bnobt/cntbt record. */
  98STATIC int
  99xchk_allocbt_rec(
 100        struct xchk_btree       *bs,
 101        union xfs_btree_rec     *rec)
 102{
 103        struct xfs_mount        *mp = bs->cur->bc_mp;
 104        xfs_agnumber_t          agno = bs->cur->bc_private.a.agno;
 105        xfs_agblock_t           bno;
 106        xfs_extlen_t            len;
 107        int                     error = 0;
 108
 109        bno = be32_to_cpu(rec->alloc.ar_startblock);
 110        len = be32_to_cpu(rec->alloc.ar_blockcount);
 111
 112        if (bno + len <= bno ||
 113            !xfs_verify_agbno(mp, agno, bno) ||
 114            !xfs_verify_agbno(mp, agno, bno + len - 1))
 115                xchk_btree_set_corrupt(bs->sc, bs->cur, 0);
 116
 117        xchk_allocbt_xref(bs->sc, bno, len);
 118
 119        return error;
 120}
 121
 122/* Scrub the freespace btrees for some AG. */
 123STATIC int
 124xchk_allocbt(
 125        struct xfs_scrub        *sc,
 126        xfs_btnum_t             which)
 127{
 128        struct xfs_btree_cur    *cur;
 129
 130        cur = which == XFS_BTNUM_BNO ? sc->sa.bno_cur : sc->sa.cnt_cur;
 131        return xchk_btree(sc, cur, xchk_allocbt_rec, &XFS_RMAP_OINFO_AG, NULL);
 132}
 133
 134int
 135xchk_bnobt(
 136        struct xfs_scrub        *sc)
 137{
 138        return xchk_allocbt(sc, XFS_BTNUM_BNO);
 139}
 140
 141int
 142xchk_cntbt(
 143        struct xfs_scrub        *sc)
 144{
 145        return xchk_allocbt(sc, XFS_BTNUM_CNT);
 146}
 147
 148/* xref check that the extent is not free */
 149void
 150xchk_xref_is_used_space(
 151        struct xfs_scrub        *sc,
 152        xfs_agblock_t           agbno,
 153        xfs_extlen_t            len)
 154{
 155        bool                    is_freesp;
 156        int                     error;
 157
 158        if (!sc->sa.bno_cur || xchk_skip_xref(sc->sm))
 159                return;
 160
 161        error = xfs_alloc_has_record(sc->sa.bno_cur, agbno, len, &is_freesp);
 162        if (!xchk_should_check_xref(sc, &error, &sc->sa.bno_cur))
 163                return;
 164        if (is_freesp)
 165                xchk_btree_xref_set_corrupt(sc, sc->sa.bno_cur, 0);
 166}
 167