fs/xfs/scrub/rtbitmap.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_log_format.h"
  13 #include "xfs_trans.h"
  14 #include "xfs_rtalloc.h"
  15 #include "xfs_inode.h"
  16 #include "xfs_bmap.h"
  17 #include "scrub/scrub.h"
  18 #include "scrub/common.h"
  19
  20 /* Set us up with the realtime metadata locked. */
  21 int
  22 xchk_setup_rt(
  23         struct xfs_scrub        *sc,
  24         struct xfs_inode        *ip)
  25 {
  26         int                     error;
  27
  28         error = xchk_setup_fs(sc, ip);
  29         if (error)
  30                 return error;
  31
  32         sc->ilock_flags = XFS_ILOCK_EXCL | XFS_ILOCK_RTBITMAP;
  33         sc->ip = sc->mp->m_rbmip;
  34         xfs_ilock(sc->ip, sc->ilock_flags);
  35
  36         return 0;
  37 }
  38
  39 /* Realtime bitmap. */
  40
  41 /* Scrub a free extent record from the realtime bitmap. */
  42 STATIC int
  43 xchk_rtbitmap_rec(
  44         struct xfs_trans        *tp,
  45         struct xfs_rtalloc_rec  *rec,
  46         void                    *priv)
  47 {
  48         struct xfs_scrub        *sc = priv;
  49         xfs_rtblock_t           startblock;
  50         xfs_rtblock_t           blockcount;
  51
  52         startblock = rec->ar_startext * tp->t_mountp->m_sb.sb_rextsize;
  53         blockcount = rec->ar_extcount * tp->t_mountp->m_sb.sb_rextsize;
  54
  55         if (!xfs_verify_rtext(sc->mp, startblock, blockcount))
  56                 xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, 0);
  57         return 0;
  58 }
  59
  60 /* Make sure the entire rtbitmap file is mapped with written extents. */
  61 STATIC int
  62 xchk_rtbitmap_check_extents(
  63         struct xfs_scrub        *sc)
  64 {
  65         struct xfs_mount        *mp = sc->mp;
  66         struct xfs_bmbt_irec    map;
  67         xfs_rtblock_t           off;
  68         int                     nmap;
  69         int                     error = 0;
  70
  71         for (off = 0; off < mp->m_sb.sb_rbmblocks;) {
  72                 if (xchk_should_terminate(sc, &error) ||
  73                     (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT))
  74                         break;
  75
  76                 /* Make sure we have a written extent. */
  77                 nmap = 1;
  78                 error = xfs_bmapi_read(mp->m_rbmip, off,
  79                                 mp->m_sb.sb_rbmblocks - off, &map, &nmap,
  80                                 XFS_DATA_FORK);
  81                 if (!xchk_fblock_process_error(sc, XFS_DATA_FORK, off, &error))
  82                         break;
  83
  84                 if (nmap != 1 || !xfs_bmap_is_written_extent(&map)) {
  85                         xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, off);
  86                         break;
  87                 }
  88
  89                 off += map.br_blockcount;
  90         }
  91
  92         return error;
  93 }
  94
  95 /* Scrub the realtime bitmap. */
  96 int
  97 xchk_rtbitmap(
  98         struct xfs_scrub        *sc)
  99 {
 100         int                     error;
 101
 102         /* Is the size of the rtbitmap correct? */
 103         if (sc->mp->m_rbmip->i_d.di_size !=
 104             XFS_FSB_TO_B(sc->mp, sc->mp->m_sb.sb_rbmblocks)) {
 105                 xchk_ino_set_corrupt(sc, sc->mp->m_rbmip->i_ino);
 106                 return 0;
 107         }
 108
 109         /* Invoke the fork scrubber. */
 110         error = xchk_metadata_inode_forks(sc);
 111         if (error || (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT))
 112                 return error;
 113
 114         error = xchk_rtbitmap_check_extents(sc);
 115         if (error || (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT))
 116                 return error;
 117
 118         error = xfs_rtalloc_query_all(sc->tp, xchk_rtbitmap_rec, sc);
 119         if (!xchk_fblock_process_error(sc, XFS_DATA_FORK, 0, &error))
 120                 goto out;
 121
 122 out:
 123         return error;
 124 }
 125
 126 /* Scrub the realtime summary. */
 127 int
 128 xchk_rtsummary(
 129         struct xfs_scrub        *sc)
 130 {
 131         struct xfs_inode        *rsumip = sc->mp->m_rsumip;
 132         struct xfs_inode        *old_ip = sc->ip;
 133         uint                    old_ilock_flags = sc->ilock_flags;
 134         int                     error = 0;
 135
 136         /*
 137          * We ILOCK'd the rt bitmap ip in the setup routine, now lock the
 138          * rt summary ip in compliance with the rt inode locking rules.
 139          *
 140          * Since we switch sc->ip to rsumip we have to save the old ilock
 141          * flags so that we don't mix up the inode state that @sc tracks.
 142          */
 143         sc->ip = rsumip;
 144         sc->ilock_flags = XFS_ILOCK_EXCL | XFS_ILOCK_RTSUM;
 145         xfs_ilock(sc->ip, sc->ilock_flags);
 146
 147         /* Invoke the fork scrubber. */
 148         error = xchk_metadata_inode_forks(sc);
 149         if (error || (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT))
 150                 goto out;
 151
 152         /* XXX: implement this some day */
 153         xchk_set_incomplete(sc);
 154 out:
 155         /* Switch back to the rtbitmap inode and lock flags. */
 156         xfs_iunlock(sc->ip, sc->ilock_flags);
 157         sc->ilock_flags = old_ilock_flags;
 158         sc->ip = old_ip;
 159         return error;
 160 }
 161
 162
 163 /* xref check that the extent is not free in the rtbitmap */
 164 void
 165 xchk_xref_is_used_rt_space(
 166         struct xfs_scrub        *sc,
 167         xfs_rtblock_t           fsbno,
 168         xfs_extlen_t            len)
 169 {
 170         xfs_rtblock_t           startext;
 171         xfs_rtblock_t           endext;
 172         xfs_rtblock_t           extcount;
 173         bool                    is_free;
 174         int                     error;
 175
 176         if (xchk_skip_xref(sc->sm))
 177                 return;
 178
 179         startext = fsbno;
 180         endext = fsbno + len - 1;
 181         do_div(startext, sc->mp->m_sb.sb_rextsize);
 182         do_div(endext, sc->mp->m_sb.sb_rextsize);
 183         extcount = endext - startext + 1;
 184         xfs_ilock(sc->mp->m_rbmip, XFS_ILOCK_SHARED | XFS_ILOCK_RTBITMAP);
 185         error = xfs_rtalloc_extent_is_free(sc->mp, sc->tp, startext, extcount,
 186                         &is_free);
 187         if (!xchk_should_check_xref(sc, &error, NULL))
 188                 goto out_unlock;
 189         if (is_free)
 190                 xchk_ino_xref_set_corrupt(sc, sc->mp->m_rbmip->i_ino);
 191 out_unlock:
 192         xfs_iunlock(sc->mp->m_rbmip, XFS_ILOCK_SHARED | XFS_ILOCK_RTBITMAP);
 193 }