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_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. */
  20int
  21xchk_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. */
  41STATIC int
  42xchk_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. */
  62int
  63xchk_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
  77out:
  78        return error;
  79}
  80
  81/* Scrub the realtime summary. */
  82int
  83xchk_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);
 109out:
 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 */
 119void
 120xchk_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);
 146out_unlock:
 147        xfs_iunlock(sc->mp->m_rbmip, XFS_ILOCK_SHARED | XFS_ILOCK_RTBITMAP);
 148}
 149