fs/xfs/scrub/rmap.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_ialloc.h"
  20 #include "xfs_rmap.h"
  21 #include "xfs_refcount.h"
  22 #include "scrub/xfs_scrub.h"
  23 #include "scrub/scrub.h"
  24 #include "scrub/common.h"
  25 #include "scrub/btree.h"
  26 #include "scrub/trace.h"
  27
  28 /*
  29  * Set us up to scrub reverse mapping btrees.
  30  */
  31 int
  32 xchk_setup_ag_rmapbt(
  33         struct xfs_scrub        *sc,
  34         struct xfs_inode        *ip)
  35 {
  36         return xchk_setup_ag_btree(sc, ip, false);
  37 }
  38
  39 /* Reverse-mapping scrubber. */
  40
  41 /* Cross-reference a rmap against the refcount btree. */
  42 STATIC void
  43 xchk_rmapbt_xref_refc(
  44         struct xfs_scrub        *sc,
  45         struct xfs_rmap_irec    *irec)
  46 {
  47         xfs_agblock_t           fbno;
  48         xfs_extlen_t            flen;
  49         bool                    non_inode;
  50         bool                    is_bmbt;
  51         bool                    is_attr;
  52         bool                    is_unwritten;
  53         int                     error;
  54
  55         if (!sc->sa.refc_cur || xchk_skip_xref(sc->sm))
  56                 return;
  57
  58         non_inode = XFS_RMAP_NON_INODE_OWNER(irec->rm_owner);
  59         is_bmbt = irec->rm_flags & XFS_RMAP_BMBT_BLOCK;
  60         is_attr = irec->rm_flags & XFS_RMAP_ATTR_FORK;
  61         is_unwritten = irec->rm_flags & XFS_RMAP_UNWRITTEN;
  62
  63         /* If this is shared, must be a data fork extent. */
  64         error = xfs_refcount_find_shared(sc->sa.refc_cur, irec->rm_startblock,
  65                         irec->rm_blockcount, &fbno, &flen, false);
  66         if (!xchk_should_check_xref(sc, &error, &sc->sa.refc_cur))
  67                 return;
  68         if (flen != 0 && (non_inode || is_attr || is_bmbt || is_unwritten))
  69                 xchk_btree_xref_set_corrupt(sc, sc->sa.refc_cur, 0);
  70 }
  71
  72 /* Cross-reference with the other btrees. */
  73 STATIC void
  74 xchk_rmapbt_xref(
  75         struct xfs_scrub        *sc,
  76         struct xfs_rmap_irec    *irec)
  77 {
  78         xfs_agblock_t           agbno = irec->rm_startblock;
  79         xfs_extlen_t            len = irec->rm_blockcount;
  80
  81         if (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)
  82                 return;
  83
  84         xchk_xref_is_used_space(sc, agbno, len);
  85         if (irec->rm_owner == XFS_RMAP_OWN_INODES)
  86                 xchk_xref_is_inode_chunk(sc, agbno, len);
  87         else
  88                 xchk_xref_is_not_inode_chunk(sc, agbno, len);
  89         if (irec->rm_owner == XFS_RMAP_OWN_COW)
  90                 xchk_xref_is_cow_staging(sc, irec->rm_startblock,
  91                                 irec->rm_blockcount);
  92         else
  93                 xchk_rmapbt_xref_refc(sc, irec);
  94 }
  95
  96 /* Scrub an rmapbt record. */
  97 STATIC int
  98 xchk_rmapbt_rec(
  99         struct xchk_btree       *bs,
 100         union xfs_btree_rec     *rec)
 101 {
 102         struct xfs_mount        *mp = bs->cur->bc_mp;
 103         struct xfs_rmap_irec    irec;
 104         xfs_agnumber_t          agno = bs->cur->bc_private.a.agno;
 105         bool                    non_inode;
 106         bool                    is_unwritten;
 107         bool                    is_bmbt;
 108         bool                    is_attr;
 109         int                     error;
 110
 111         error = xfs_rmap_btrec_to_irec(rec, &irec);
 112         if (!xchk_btree_process_error(bs->sc, bs->cur, 0, &error))
 113                 goto out;
 114
 115         /* Check extent. */
 116         if (irec.rm_startblock + irec.rm_blockcount <= irec.rm_startblock)
 117                 xchk_btree_set_corrupt(bs->sc, bs->cur, 0);
 118
 119         if (irec.rm_owner == XFS_RMAP_OWN_FS) {
 120                 /*
 121                  * xfs_verify_agbno returns false for static fs metadata.
 122                  * Since that only exists at the start of the AG, validate
 123                  * that by hand.
 124                  */
 125                 if (irec.rm_startblock != 0 ||
 126                     irec.rm_blockcount != XFS_AGFL_BLOCK(mp) + 1)
 127                         xchk_btree_set_corrupt(bs->sc, bs->cur, 0);
 128         } else {
 129                 /*
 130                  * Otherwise we must point somewhere past the static metadata
 131                  * but before the end of the FS.  Run the regular check.
 132                  */
 133                 if (!xfs_verify_agbno(mp, agno, irec.rm_startblock) ||
 134                     !xfs_verify_agbno(mp, agno, irec.rm_startblock +
 135                                 irec.rm_blockcount - 1))
 136                         xchk_btree_set_corrupt(bs->sc, bs->cur, 0);
 137         }
 138
 139         /* Check flags. */
 140         non_inode = XFS_RMAP_NON_INODE_OWNER(irec.rm_owner);
 141         is_bmbt = irec.rm_flags & XFS_RMAP_BMBT_BLOCK;
 142         is_attr = irec.rm_flags & XFS_RMAP_ATTR_FORK;
 143         is_unwritten = irec.rm_flags & XFS_RMAP_UNWRITTEN;
 144
 145         if (is_bmbt && irec.rm_offset != 0)
 146                 xchk_btree_set_corrupt(bs->sc, bs->cur, 0);
 147
 148         if (non_inode && irec.rm_offset != 0)
 149                 xchk_btree_set_corrupt(bs->sc, bs->cur, 0);
 150
 151         if (is_unwritten && (is_bmbt || non_inode || is_attr))
 152                 xchk_btree_set_corrupt(bs->sc, bs->cur, 0);
 153
 154         if (non_inode && (is_bmbt || is_unwritten || is_attr))
 155                 xchk_btree_set_corrupt(bs->sc, bs->cur, 0);
 156
 157         if (!non_inode) {
 158                 if (!xfs_verify_ino(mp, irec.rm_owner))
 159                         xchk_btree_set_corrupt(bs->sc, bs->cur, 0);
 160         } else {
 161                 /* Non-inode owner within the magic values? */
 162                 if (irec.rm_owner <= XFS_RMAP_OWN_MIN ||
 163                     irec.rm_owner > XFS_RMAP_OWN_FS)
 164                         xchk_btree_set_corrupt(bs->sc, bs->cur, 0);
 165         }
 166
 167         xchk_rmapbt_xref(bs->sc, &irec);
 168 out:
 169         return error;
 170 }
 171
 172 /* Scrub the rmap btree for some AG. */
 173 int
 174 xchk_rmapbt(
 175         struct xfs_scrub        *sc)
 176 {
 177         struct xfs_owner_info   oinfo;
 178
 179         xfs_rmap_ag_owner(&oinfo, XFS_RMAP_OWN_AG);
 180         return xchk_btree(sc, sc->sa.rmap_cur, xchk_rmapbt_rec,
 181                         &oinfo, NULL);
 182 }
 183
 184 /* xref check that the extent is owned by a given owner */
 185 static inline void
 186 xchk_xref_check_owner(
 187         struct xfs_scrub        *sc,
 188         xfs_agblock_t           bno,
 189         xfs_extlen_t            len,
 190         struct xfs_owner_info   *oinfo,
 191         bool                    should_have_rmap)
 192 {
 193         bool                    has_rmap;
 194         int                     error;
 195
 196         if (!sc->sa.rmap_cur || xchk_skip_xref(sc->sm))
 197                 return;
 198
 199         error = xfs_rmap_record_exists(sc->sa.rmap_cur, bno, len, oinfo,
 200                         &has_rmap);
 201         if (!xchk_should_check_xref(sc, &error, &sc->sa.rmap_cur))
 202                 return;
 203         if (has_rmap != should_have_rmap)
 204                 xchk_btree_xref_set_corrupt(sc, sc->sa.rmap_cur, 0);
 205 }
 206
 207 /* xref check that the extent is owned by a given owner */
 208 void
 209 xchk_xref_is_owned_by(
 210         struct xfs_scrub        *sc,
 211         xfs_agblock_t           bno,
 212         xfs_extlen_t            len,
 213         struct xfs_owner_info   *oinfo)
 214 {
 215         xchk_xref_check_owner(sc, bno, len, oinfo, true);
 216 }
 217
 218 /* xref check that the extent is not owned by a given owner */
 219 void
 220 xchk_xref_is_not_owned_by(
 221         struct xfs_scrub        *sc,
 222         xfs_agblock_t           bno,
 223         xfs_extlen_t            len,
 224         struct xfs_owner_info   *oinfo)
 225 {
 226         xchk_xref_check_owner(sc, bno, len, oinfo, false);
 227 }
 228
 229 /* xref check that the extent has no reverse mapping at all */
 230 void
 231 xchk_xref_has_no_owner(
 232         struct xfs_scrub        *sc,
 233         xfs_agblock_t           bno,
 234         xfs_extlen_t            len)
 235 {
 236         bool                    has_rmap;
 237         int                     error;
 238
 239         if (!sc->sa.rmap_cur || xchk_skip_xref(sc->sm))
 240                 return;
 241
 242         error = xfs_rmap_has_record(sc->sa.rmap_cur, bno, len, &has_rmap);
 243         if (!xchk_should_check_xref(sc, &error, &sc->sa.rmap_cur))
 244                 return;
 245         if (has_rmap)
 246                 xchk_btree_xref_set_corrupt(sc, sc->sa.rmap_cur, 0);
 247 }