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_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
  19 /*
  20  * Set us up to scrub free space btrees.
  21  */
  22 int
  23 xchk_setup_ag_allocbt(
  24         struct xfs_scrub        *sc,
  25         struct xfs_inode        *ip)
  26 {
  27         return xchk_setup_ag_btree(sc, ip, 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  */
  35 STATIC void
  36 xchk_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. */
  75 STATIC void
  76 xchk_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. */
  91 STATIC int
  92 xchk_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_private.a.agno;
  98         xfs_agblock_t           bno;
  99         xfs_extlen_t            len;
 100         int                     error = 0;
 101
 102         bno = be32_to_cpu(rec->alloc.ar_startblock);
 103         len = be32_to_cpu(rec->alloc.ar_blockcount);
 104
 105         if (bno + len <= bno ||
 106             !xfs_verify_agbno(mp, agno, bno) ||
 107             !xfs_verify_agbno(mp, agno, bno + len - 1))
 108                 xchk_btree_set_corrupt(bs->sc, bs->cur, 0);
 109
 110         xchk_allocbt_xref(bs->sc, bno, len);
 111
 112         return error;
 113 }
 114
 115 /* Scrub the freespace btrees for some AG. */
 116 STATIC int
 117 xchk_allocbt(
 118         struct xfs_scrub        *sc,
 119         xfs_btnum_t             which)
 120 {
 121         struct xfs_btree_cur    *cur;
 122
 123         cur = which == XFS_BTNUM_BNO ? sc->sa.bno_cur : sc->sa.cnt_cur;
 124         return xchk_btree(sc, cur, xchk_allocbt_rec, &XFS_RMAP_OINFO_AG, NULL);
 125 }
 126
 127 int
 128 xchk_bnobt(
 129         struct xfs_scrub        *sc)
 130 {
 131         return xchk_allocbt(sc, XFS_BTNUM_BNO);
 132 }
 133
 134 int
 135 xchk_cntbt(
 136         struct xfs_scrub        *sc)
 137 {
 138         return xchk_allocbt(sc, XFS_BTNUM_CNT);
 139 }
 140
 141 /* xref check that the extent is not free */
 142 void
 143 xchk_xref_is_used_space(
 144         struct xfs_scrub        *sc,
 145         xfs_agblock_t           agbno,
 146         xfs_extlen_t            len)
 147 {
 148         bool                    is_freesp;
 149         int                     error;
 150
 151         if (!sc->sa.bno_cur || xchk_skip_xref(sc->sm))
 152                 return;
 153
 154         error = xfs_alloc_has_record(sc->sa.bno_cur, agbno, len, &is_freesp);
 155         if (!xchk_should_check_xref(sc, &error, &sc->sa.bno_cur))
 156                 return;
 157         if (is_freesp)
 158                 xchk_btree_xref_set_corrupt(sc, sc->sa.bno_cur, 0);
 159 }