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 "xfs_alloc.h"
  21 #include "scrub/xfs_scrub.h"
  22 #include "scrub/scrub.h"
  23 #include "scrub/common.h"
  24 #include "scrub/btree.h"
  25 #include "scrub/trace.h"
  26
  27 /*
  28  * Set us up to scrub free space btrees.
  29  */
  30 int
  31 xchk_setup_ag_allocbt(
  32         struct xfs_scrub        *sc,
  33         struct xfs_inode        *ip)
  34 {
  35         return xchk_setup_ag_btree(sc, ip, false);
  36 }
  37
  38 /* Free space btree scrubber. */
  39 /*
  40  * Ensure there's a corresponding cntbt/bnobt record matching this
  41  * bnobt/cntbt record, respectively.
  42  */
  43 STATIC void
  44 xchk_allocbt_xref_other(
  45         struct xfs_scrub        *sc,
  46         xfs_agblock_t           agbno,
  47         xfs_extlen_t            len)
  48 {
  49         struct xfs_btree_cur    **pcur;
  50         xfs_agblock_t           fbno;
  51         xfs_extlen_t            flen;
  52         int                     has_otherrec;
  53         int                     error;
  54
  55         if (sc->sm->sm_type == XFS_SCRUB_TYPE_BNOBT)
  56                 pcur = &sc->sa.cnt_cur;
  57         else
  58                 pcur = &sc->sa.bno_cur;
  59         if (!*pcur || xchk_skip_xref(sc->sm))
  60                 return;
  61
  62         error = xfs_alloc_lookup_le(*pcur, agbno, len, &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         error = xfs_alloc_get_rec(*pcur, &fbno, &flen, &has_otherrec);
  71         if (!xchk_should_check_xref(sc, &error, pcur))
  72                 return;
  73         if (!has_otherrec) {
  74                 xchk_btree_xref_set_corrupt(sc, *pcur, 0);
  75                 return;
  76         }
  77
  78         if (fbno != agbno || flen != len)
  79                 xchk_btree_xref_set_corrupt(sc, *pcur, 0);
  80 }
  81
  82 /* Cross-reference with the other btrees. */
  83 STATIC void
  84 xchk_allocbt_xref(
  85         struct xfs_scrub        *sc,
  86         xfs_agblock_t           agbno,
  87         xfs_extlen_t            len)
  88 {
  89         if (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)
  90                 return;
  91
  92         xchk_allocbt_xref_other(sc, agbno, len);
  93         xchk_xref_is_not_inode_chunk(sc, agbno, len);
  94         xchk_xref_has_no_owner(sc, agbno, len);
  95         xchk_xref_is_not_shared(sc, agbno, len);
  96 }
  97
  98 /* Scrub a bnobt/cntbt record. */
  99 STATIC int
 100 xchk_allocbt_rec(
 101         struct xchk_btree       *bs,
 102         union xfs_btree_rec     *rec)
 103 {
 104         struct xfs_mount        *mp = bs->cur->bc_mp;
 105         xfs_agnumber_t          agno = bs->cur->bc_private.a.agno;
 106         xfs_agblock_t           bno;
 107         xfs_extlen_t            len;
 108         int                     error = 0;
 109
 110         bno = be32_to_cpu(rec->alloc.ar_startblock);
 111         len = be32_to_cpu(rec->alloc.ar_blockcount);
 112
 113         if (bno + len <= bno ||
 114             !xfs_verify_agbno(mp, agno, bno) ||
 115             !xfs_verify_agbno(mp, agno, bno + len - 1))
 116                 xchk_btree_set_corrupt(bs->sc, bs->cur, 0);
 117
 118         xchk_allocbt_xref(bs->sc, bno, len);
 119
 120         return error;
 121 }
 122
 123 /* Scrub the freespace btrees for some AG. */
 124 STATIC int
 125 xchk_allocbt(
 126         struct xfs_scrub        *sc,
 127         xfs_btnum_t             which)
 128 {
 129         struct xfs_owner_info   oinfo;
 130         struct xfs_btree_cur    *cur;
 131
 132         xfs_rmap_ag_owner(&oinfo, XFS_RMAP_OWN_AG);
 133         cur = which == XFS_BTNUM_BNO ? sc->sa.bno_cur : sc->sa.cnt_cur;
 134         return xchk_btree(sc, cur, xchk_allocbt_rec, &oinfo, NULL);
 135 }
 136
 137 int
 138 xchk_bnobt(
 139         struct xfs_scrub        *sc)
 140 {
 141         return xchk_allocbt(sc, XFS_BTNUM_BNO);
 142 }
 143
 144 int
 145 xchk_cntbt(
 146         struct xfs_scrub        *sc)
 147 {
 148         return xchk_allocbt(sc, XFS_BTNUM_CNT);
 149 }
 150
 151 /* xref check that the extent is not free */
 152 void
 153 xchk_xref_is_used_space(
 154         struct xfs_scrub        *sc,
 155         xfs_agblock_t           agbno,
 156         xfs_extlen_t            len)
 157 {
 158         bool                    is_freesp;
 159         int                     error;
 160
 161         if (!sc->sa.bno_cur || xchk_skip_xref(sc->sm))
 162                 return;
 163
 164         error = xfs_alloc_has_record(sc->sa.bno_cur, agbno, len, &is_freesp);
 165         if (!xchk_should_check_xref(sc, &error, &sc->sa.bno_cur))
 166                 return;
 167         if (is_freesp)
 168                 xchk_btree_xref_set_corrupt(sc, sc->sa.bno_cur, 0);
 169 }