root/fs/xfs/scrub/rtbitmap.c

DEFINITIONS

1. xchk_setup_rt
2. xchk_rtbitmap_rec
3. xchk_rtbitmap
4. xchk_rtsummary
5. xchk_xref_is_used_rt_space

   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 "scrub/scrub.h"
  17 #include "scrub/common.h"
  18 
  19 /* Set us up with the realtime metadata locked. */
  20 int
  21 xchk_setup_rt(
  22         struct xfs_scrub        *sc,
  23         struct xfs_inode        *ip)
  24 {
  25         int                     error;
  26 
  27         error = xchk_setup_fs(sc, ip);
  28         if (error)
  29                 return error;
  30 
  31         sc->ilock_flags = XFS_ILOCK_EXCL | XFS_ILOCK_RTBITMAP;
  32         sc->ip = sc->mp->m_rbmip;
  33         xfs_ilock(sc->ip, sc->ilock_flags);
  34 
  35         return 0;
  36 }
  37 
  38 /* Realtime bitmap. */
  39 
  40 /* Scrub a free extent record from the realtime bitmap. */
  41 STATIC int
  42 xchk_rtbitmap_rec(
  43         struct xfs_trans        *tp,
  44         struct xfs_rtalloc_rec  *rec,
  45         void                    *priv)
  46 {
  47         struct xfs_scrub        *sc = priv;
  48         xfs_rtblock_t           startblock;
  49         xfs_rtblock_t           blockcount;
  50 
  51         startblock = rec->ar_startext * tp->t_mountp->m_sb.sb_rextsize;
  52         blockcount = rec->ar_extcount * tp->t_mountp->m_sb.sb_rextsize;
  53 
  54         if (startblock + blockcount <= startblock ||
  55             !xfs_verify_rtbno(sc->mp, startblock) ||
  56             !xfs_verify_rtbno(sc->mp, startblock + blockcount - 1))
  57                 xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, 0);
  58         return 0;
  59 }
  60 
  61 /* Scrub the realtime bitmap. */
  62 int
  63 xchk_rtbitmap(
  64         struct xfs_scrub        *sc)
  65 {
  66         int                     error;
  67 
  68         /* Invoke the fork scrubber. */
  69         error = xchk_metadata_inode_forks(sc);
  70         if (error || (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT))
  71                 return error;
  72 
  73         error = xfs_rtalloc_query_all(sc->tp, xchk_rtbitmap_rec, sc);
  74         if (!xchk_fblock_process_error(sc, XFS_DATA_FORK, 0, &error))
  75                 goto out;
  76 
  77 out:
  78         return error;
  79 }
  80 
  81 /* Scrub the realtime summary. */
  82 int
  83 xchk_rtsummary(
  84         struct xfs_scrub        *sc)
  85 {
  86         struct xfs_inode        *rsumip = sc->mp->m_rsumip;
  87         struct xfs_inode        *old_ip = sc->ip;
  88         uint                    old_ilock_flags = sc->ilock_flags;
  89         int                     error = 0;
  90 
  91         /*
  92          * We ILOCK'd the rt bitmap ip in the setup routine, now lock the
  93          * rt summary ip in compliance with the rt inode locking rules.
  94          *
  95          * Since we switch sc->ip to rsumip we have to save the old ilock
  96          * flags so that we don't mix up the inode state that @sc tracks.
  97          */
  98         sc->ip = rsumip;
  99         sc->ilock_flags = XFS_ILOCK_EXCL | XFS_ILOCK_RTSUM;
 100         xfs_ilock(sc->ip, sc->ilock_flags);
 101 
 102         /* Invoke the fork scrubber. */
 103         error = xchk_metadata_inode_forks(sc);
 104         if (error || (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT))
 105                 goto out;
 106 
 107         /* XXX: implement this some day */
 108         xchk_set_incomplete(sc);
 109 out:
 110         /* Switch back to the rtbitmap inode and lock flags. */
 111         xfs_iunlock(sc->ip, sc->ilock_flags);
 112         sc->ilock_flags = old_ilock_flags;
 113         sc->ip = old_ip;
 114         return error;
 115 }
 116 
 117 
 118 /* xref check that the extent is not free in the rtbitmap */
 119 void
 120 xchk_xref_is_used_rt_space(
 121         struct xfs_scrub        *sc,
 122         xfs_rtblock_t           fsbno,
 123         xfs_extlen_t            len)
 124 {
 125         xfs_rtblock_t           startext;
 126         xfs_rtblock_t           endext;
 127         xfs_rtblock_t           extcount;
 128         bool                    is_free;
 129         int                     error;
 130 
 131         if (xchk_skip_xref(sc->sm))
 132                 return;
 133 
 134         startext = fsbno;
 135         endext = fsbno + len - 1;
 136         do_div(startext, sc->mp->m_sb.sb_rextsize);
 137         do_div(endext, sc->mp->m_sb.sb_rextsize);
 138         extcount = endext - startext + 1;
 139         xfs_ilock(sc->mp->m_rbmip, XFS_ILOCK_SHARED | XFS_ILOCK_RTBITMAP);
 140         error = xfs_rtalloc_extent_is_free(sc->mp, sc->tp, startext, extcount,
 141                         &is_free);
 142         if (!xchk_should_check_xref(sc, &error, NULL))
 143                 goto out_unlock;
 144         if (is_free)
 145                 xchk_ino_xref_set_corrupt(sc, sc->mp->m_rbmip->i_ino);
 146 out_unlock:
 147         xfs_iunlock(sc->mp->m_rbmip, XFS_ILOCK_SHARED | XFS_ILOCK_RTBITMAP);
 148 }