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_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_rtalloc.h"
  20 #include "xfs_inode.h"
  21 #include "scrub/xfs_scrub.h"
  22 #include "scrub/scrub.h"
  23 #include "scrub/common.h"
  24 #include "scrub/trace.h"
  25
  26 /* Set us up with the realtime metadata locked. */
  27 int
  28 xchk_setup_rt(
  29         struct xfs_scrub        *sc,
  30         struct xfs_inode        *ip)
  31 {
  32         int                     error;
  33
  34         error = xchk_setup_fs(sc, ip);
  35         if (error)
  36                 return error;
  37
  38         sc->ilock_flags = XFS_ILOCK_EXCL | XFS_ILOCK_RTBITMAP;
  39         sc->ip = sc->mp->m_rbmip;
  40         xfs_ilock(sc->ip, sc->ilock_flags);
  41
  42         return 0;
  43 }
  44
  45 /* Realtime bitmap. */
  46
  47 /* Scrub a free extent record from the realtime bitmap. */
  48 STATIC int
  49 xchk_rtbitmap_rec(
  50         struct xfs_trans        *tp,
  51         struct xfs_rtalloc_rec  *rec,
  52         void                    *priv)
  53 {
  54         struct xfs_scrub        *sc = priv;
  55         xfs_rtblock_t           startblock;
  56         xfs_rtblock_t           blockcount;
  57
  58         startblock = rec->ar_startext * tp->t_mountp->m_sb.sb_rextsize;
  59         blockcount = rec->ar_extcount * tp->t_mountp->m_sb.sb_rextsize;
  60
  61         if (startblock + blockcount <= startblock ||
  62             !xfs_verify_rtbno(sc->mp, startblock) ||
  63             !xfs_verify_rtbno(sc->mp, startblock + blockcount - 1))
  64                 xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, 0);
  65         return 0;
  66 }
  67
  68 /* Scrub the realtime bitmap. */
  69 int
  70 xchk_rtbitmap(
  71         struct xfs_scrub        *sc)
  72 {
  73         int                     error;
  74
  75         /* Invoke the fork scrubber. */
  76         error = xchk_metadata_inode_forks(sc);
  77         if (error || (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT))
  78                 return error;
  79
  80         error = xfs_rtalloc_query_all(sc->tp, xchk_rtbitmap_rec, sc);
  81         if (!xchk_fblock_process_error(sc, XFS_DATA_FORK, 0, &error))
  82                 goto out;
  83
  84 out:
  85         return error;
  86 }
  87
  88 /* Scrub the realtime summary. */
  89 int
  90 xchk_rtsummary(
  91         struct xfs_scrub        *sc)
  92 {
  93         struct xfs_inode        *rsumip = sc->mp->m_rsumip;
  94         struct xfs_inode        *old_ip = sc->ip;
  95         uint                    old_ilock_flags = sc->ilock_flags;
  96         int                     error = 0;
  97
  98         /*
  99          * We ILOCK'd the rt bitmap ip in the setup routine, now lock the
 100          * rt summary ip in compliance with the rt inode locking rules.
 101          *
 102          * Since we switch sc->ip to rsumip we have to save the old ilock
 103          * flags so that we don't mix up the inode state that @sc tracks.
 104          */
 105         sc->ip = rsumip;
 106         sc->ilock_flags = XFS_ILOCK_EXCL | XFS_ILOCK_RTSUM;
 107         xfs_ilock(sc->ip, sc->ilock_flags);
 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                 goto out;
 113
 114         /* XXX: implement this some day */
 115         xchk_set_incomplete(sc);
 116 out:
 117         /* Switch back to the rtbitmap inode and lock flags. */
 118         xfs_iunlock(sc->ip, sc->ilock_flags);
 119         sc->ilock_flags = old_ilock_flags;
 120         sc->ip = old_ip;
 121         return error;
 122 }
 123
 124
 125 /* xref check that the extent is not free in the rtbitmap */
 126 void
 127 xchk_xref_is_used_rt_space(
 128         struct xfs_scrub        *sc,
 129         xfs_rtblock_t           fsbno,
 130         xfs_extlen_t            len)
 131 {
 132         xfs_rtblock_t           startext;
 133         xfs_rtblock_t           endext;
 134         xfs_rtblock_t           extcount;
 135         bool                    is_free;
 136         int                     error;
 137
 138         if (xchk_skip_xref(sc->sm))
 139                 return;
 140
 141         startext = fsbno;
 142         endext = fsbno + len - 1;
 143         do_div(startext, sc->mp->m_sb.sb_rextsize);
 144         if (do_div(endext, sc->mp->m_sb.sb_rextsize))
 145                 endext++;
 146         extcount = endext - startext;
 147         xfs_ilock(sc->mp->m_rbmip, XFS_ILOCK_SHARED | XFS_ILOCK_RTBITMAP);
 148         error = xfs_rtalloc_extent_is_free(sc->mp, sc->tp, startext, extcount,
 149                         &is_free);
 150         if (!xchk_should_check_xref(sc, &error, NULL))
 151                 goto out_unlock;
 152         if (is_free)
 153                 xchk_ino_xref_set_corrupt(sc, sc->mp->m_rbmip->i_ino);
 154 out_unlock:
 155         xfs_iunlock(sc->mp->m_rbmip, XFS_ILOCK_SHARED | XFS_ILOCK_RTBITMAP);
 156 }