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  */
  29 int
  30 xchk_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  */
  42 STATIC void
  43 xchk_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. */
  82 STATIC void
  83 xchk_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. */
  98 STATIC int
  99 xchk_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. */
 123 STATIC int
 124 xchk_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
 134 int
 135 xchk_bnobt(
 136         struct xfs_scrub        *sc)
 137 {
 138         return xchk_allocbt(sc, XFS_BTNUM_BNO);
 139 }
 140
 141 int
 142 xchk_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 */
 149 void
 150 xchk_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 }