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