fs/xfs/scrub/alloc.c

   1 /*
   2  * Copyright (C) 2017 Oracle.  All Rights Reserved.
   3  *
   4  * Author: Darrick J. Wong <[email protected]>
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * as published by the Free Software Foundation; either version 2
   9  * of the License, or (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it would be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write the Free Software Foundation,
  18  * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301, USA.
  19  */
  20 #include "xfs.h"
  21 #include "xfs_fs.h"
  22 #include "xfs_shared.h"
  23 #include "xfs_format.h"
  24 #include "xfs_trans_resv.h"
  25 #include "xfs_mount.h"
  26 #include "xfs_defer.h"
  27 #include "xfs_btree.h"
  28 #include "xfs_bit.h"
  29 #include "xfs_log_format.h"
  30 #include "xfs_trans.h"
  31 #include "xfs_sb.h"
  32 #include "xfs_alloc.h"
  33 #include "xfs_rmap.h"
  34 #include "xfs_alloc.h"
  35 #include "scrub/xfs_scrub.h"
  36 #include "scrub/scrub.h"
  37 #include "scrub/common.h"
  38 #include "scrub/btree.h"
  39 #include "scrub/trace.h"
  40
  41 /*
  42  * Set us up to scrub free space btrees.
  43  */
  44 int
  45 xfs_scrub_setup_ag_allocbt(
  46         struct xfs_scrub_context        *sc,
  47         struct xfs_inode                *ip)
  48 {
  49         return xfs_scrub_setup_ag_btree(sc, ip, false);
  50 }
  51
  52 /* Free space btree scrubber. */
  53 /*
  54  * Ensure there's a corresponding cntbt/bnobt record matching this
  55  * bnobt/cntbt record, respectively.
  56  */
  57 STATIC void
  58 xfs_scrub_allocbt_xref_other(
  59         struct xfs_scrub_context        *sc,
  60         xfs_agblock_t                   agbno,
  61         xfs_extlen_t                    len)
  62 {
  63         struct xfs_btree_cur            **pcur;
  64         xfs_agblock_t                   fbno;
  65         xfs_extlen_t                    flen;
  66         int                             has_otherrec;
  67         int                             error;
  68
  69         if (sc->sm->sm_type == XFS_SCRUB_TYPE_BNOBT)
  70                 pcur = &sc->sa.cnt_cur;
  71         else
  72                 pcur = &sc->sa.bno_cur;
  73         if (!*pcur || xfs_scrub_skip_xref(sc->sm))
  74                 return;
  75
  76         error = xfs_alloc_lookup_le(*pcur, agbno, len, &has_otherrec);
  77         if (!xfs_scrub_should_check_xref(sc, &error, pcur))
  78                 return;
  79         if (!has_otherrec) {
  80                 xfs_scrub_btree_xref_set_corrupt(sc, *pcur, 0);
  81                 return;
  82         }
  83
  84         error = xfs_alloc_get_rec(*pcur, &fbno, &flen, &has_otherrec);
  85         if (!xfs_scrub_should_check_xref(sc, &error, pcur))
  86                 return;
  87         if (!has_otherrec) {
  88                 xfs_scrub_btree_xref_set_corrupt(sc, *pcur, 0);
  89                 return;
  90         }
  91
  92         if (fbno != agbno || flen != len)
  93                 xfs_scrub_btree_xref_set_corrupt(sc, *pcur, 0);
  94 }
  95
  96 /* Cross-reference with the other btrees. */
  97 STATIC void
  98 xfs_scrub_allocbt_xref(
  99         struct xfs_scrub_context        *sc,
 100         xfs_agblock_t                   agbno,
 101         xfs_extlen_t                    len)
 102 {
 103         if (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)
 104                 return;
 105
 106         xfs_scrub_allocbt_xref_other(sc, agbno, len);
 107         xfs_scrub_xref_is_not_inode_chunk(sc, agbno, len);
 108         xfs_scrub_xref_has_no_owner(sc, agbno, len);
 109         xfs_scrub_xref_is_not_shared(sc, agbno, len);
 110 }
 111
 112 /* Scrub a bnobt/cntbt record. */
 113 STATIC int
 114 xfs_scrub_allocbt_rec(
 115         struct xfs_scrub_btree          *bs,
 116         union xfs_btree_rec             *rec)
 117 {
 118         struct xfs_mount                *mp = bs->cur->bc_mp;
 119         xfs_agnumber_t                  agno = bs->cur->bc_private.a.agno;
 120         xfs_agblock_t                   bno;
 121         xfs_extlen_t                    len;
 122         int                             error = 0;
 123
 124         bno = be32_to_cpu(rec->alloc.ar_startblock);
 125         len = be32_to_cpu(rec->alloc.ar_blockcount);
 126
 127         if (bno + len <= bno ||
 128             !xfs_verify_agbno(mp, agno, bno) ||
 129             !xfs_verify_agbno(mp, agno, bno + len - 1))
 130                 xfs_scrub_btree_set_corrupt(bs->sc, bs->cur, 0);
 131
 132         xfs_scrub_allocbt_xref(bs->sc, bno, len);
 133
 134         return error;
 135 }
 136
 137 /* Scrub the freespace btrees for some AG. */
 138 STATIC int
 139 xfs_scrub_allocbt(
 140         struct xfs_scrub_context        *sc,
 141         xfs_btnum_t                     which)
 142 {
 143         struct xfs_owner_info           oinfo;
 144         struct xfs_btree_cur            *cur;
 145
 146         xfs_rmap_ag_owner(&oinfo, XFS_RMAP_OWN_AG);
 147         cur = which == XFS_BTNUM_BNO ? sc->sa.bno_cur : sc->sa.cnt_cur;
 148         return xfs_scrub_btree(sc, cur, xfs_scrub_allocbt_rec, &oinfo, NULL);
 149 }
 150
 151 int
 152 xfs_scrub_bnobt(
 153         struct xfs_scrub_context        *sc)
 154 {
 155         return xfs_scrub_allocbt(sc, XFS_BTNUM_BNO);
 156 }
 157
 158 int
 159 xfs_scrub_cntbt(
 160         struct xfs_scrub_context        *sc)
 161 {
 162         return xfs_scrub_allocbt(sc, XFS_BTNUM_CNT);
 163 }
 164
 165 /* xref check that the extent is not free */
 166 void
 167 xfs_scrub_xref_is_used_space(
 168         struct xfs_scrub_context        *sc,
 169         xfs_agblock_t                   agbno,
 170         xfs_extlen_t                    len)
 171 {
 172         bool                            is_freesp;
 173         int                             error;
 174
 175         if (!sc->sa.bno_cur || xfs_scrub_skip_xref(sc->sm))
 176                 return;
 177
 178         error = xfs_alloc_has_record(sc->sa.bno_cur, agbno, len, &is_freesp);
 179         if (!xfs_scrub_should_check_xref(sc, &error, &sc->sa.bno_cur))
 180                 return;
 181         if (is_freesp)
 182                 xfs_scrub_btree_xref_set_corrupt(sc, sc->sa.bno_cur, 0);
 183 }