LXR linux/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. */
  27int
  28xchk_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. */
  48STATIC int
  49xchk_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. */
  69int
  70xchk_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
  84out:
  85        return error;
  86}
  87
  88/* Scrub the realtime summary. */
  89int
  90xchk_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);
 116out:
 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 */
 126void
 127xchk_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);
 154out_unlock:
 155        xfs_iunlock(sc->mp->m_rbmip, XFS_ILOCK_SHARED | XFS_ILOCK_RTBITMAP);
 156}
 157