fs/xfs/scrub/quota.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_inode.h"
  15 #include "xfs_quota.h"
  16 #include "xfs_qm.h"
  17 #include "scrub/scrub.h"
  18 #include "scrub/common.h"
  19
  20 /* Convert a scrub type code to a DQ flag, or return 0 if error. */
  21 static inline uint
  22 xchk_quota_to_dqtype(
  23         struct xfs_scrub        *sc)
  24 {
  25         switch (sc->sm->sm_type) {
  26         case XFS_SCRUB_TYPE_UQUOTA:
  27                 return XFS_DQ_USER;
  28         case XFS_SCRUB_TYPE_GQUOTA:
  29                 return XFS_DQ_GROUP;
  30         case XFS_SCRUB_TYPE_PQUOTA:
  31                 return XFS_DQ_PROJ;
  32         default:
  33                 return 0;
  34         }
  35 }
  36
  37 /* Set us up to scrub a quota. */
  38 int
  39 xchk_setup_quota(
  40         struct xfs_scrub        *sc,
  41         struct xfs_inode        *ip)
  42 {
  43         uint                    dqtype;
  44         int                     error;
  45
  46         if (!XFS_IS_QUOTA_RUNNING(sc->mp) || !XFS_IS_QUOTA_ON(sc->mp))
  47                 return -ENOENT;
  48
  49         dqtype = xchk_quota_to_dqtype(sc);
  50         if (dqtype == 0)
  51                 return -EINVAL;
  52         sc->flags |= XCHK_HAS_QUOTAOFFLOCK;
  53         mutex_lock(&sc->mp->m_quotainfo->qi_quotaofflock);
  54         if (!xfs_this_quota_on(sc->mp, dqtype))
  55                 return -ENOENT;
  56         error = xchk_setup_fs(sc, ip);
  57         if (error)
  58                 return error;
  59         sc->ip = xfs_quota_inode(sc->mp, dqtype);
  60         xfs_ilock(sc->ip, XFS_ILOCK_EXCL);
  61         sc->ilock_flags = XFS_ILOCK_EXCL;
  62         return 0;
  63 }
  64
  65 /* Quotas. */
  66
  67 struct xchk_quota_info {
  68         struct xfs_scrub        *sc;
  69         xfs_dqid_t              last_id;
  70 };
  71
  72 /* Scrub the fields in an individual quota item. */
  73 STATIC int
  74 xchk_quota_item(
  75         struct xfs_dquot        *dq,
  76         uint                    dqtype,
  77         void                    *priv)
  78 {
  79         struct xchk_quota_info  *sqi = priv;
  80         struct xfs_scrub        *sc = sqi->sc;
  81         struct xfs_mount        *mp = sc->mp;
  82         struct xfs_disk_dquot   *d = &dq->q_core;
  83         struct xfs_quotainfo    *qi = mp->m_quotainfo;
  84         xfs_fileoff_t           offset;
  85         unsigned long long      bsoft;
  86         unsigned long long      isoft;
  87         unsigned long long      rsoft;
  88         unsigned long long      bhard;
  89         unsigned long long      ihard;
  90         unsigned long long      rhard;
  91         unsigned long long      bcount;
  92         unsigned long long      icount;
  93         unsigned long long      rcount;
  94         xfs_ino_t               fs_icount;
  95         xfs_dqid_t              id = be32_to_cpu(d->d_id);
  96
  97         /*
  98          * Except for the root dquot, the actual dquot we got must either have
  99          * the same or higher id as we saw before.
 100          */
 101         offset = id / qi->qi_dqperchunk;
 102         if (id && id <= sqi->last_id)
 103                 xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, offset);
 104
 105         sqi->last_id = id;
 106
 107         /* Did we get the dquot type we wanted? */
 108         if (dqtype != (d->d_flags & XFS_DQ_ALLTYPES))
 109                 xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, offset);
 110
 111         if (d->d_pad0 != cpu_to_be32(0) || d->d_pad != cpu_to_be16(0))
 112                 xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, offset);
 113
 114         /* Check the limits. */
 115         bhard = be64_to_cpu(d->d_blk_hardlimit);
 116         ihard = be64_to_cpu(d->d_ino_hardlimit);
 117         rhard = be64_to_cpu(d->d_rtb_hardlimit);
 118
 119         bsoft = be64_to_cpu(d->d_blk_softlimit);
 120         isoft = be64_to_cpu(d->d_ino_softlimit);
 121         rsoft = be64_to_cpu(d->d_rtb_softlimit);
 122
 123         /*
 124          * Warn if the hard limits are larger than the fs.
 125          * Administrators can do this, though in production this seems
 126          * suspect, which is why we flag it for review.
 127          *
 128          * Complain about corruption if the soft limit is greater than
 129          * the hard limit.
 130          */
 131         if (bhard > mp->m_sb.sb_dblocks)
 132                 xchk_fblock_set_warning(sc, XFS_DATA_FORK, offset);
 133         if (bsoft > bhard)
 134                 xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, offset);
 135
 136         if (ihard > M_IGEO(mp)->maxicount)
 137                 xchk_fblock_set_warning(sc, XFS_DATA_FORK, offset);
 138         if (isoft > ihard)
 139                 xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, offset);
 140
 141         if (rhard > mp->m_sb.sb_rblocks)
 142                 xchk_fblock_set_warning(sc, XFS_DATA_FORK, offset);
 143         if (rsoft > rhard)
 144                 xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, offset);
 145
 146         /* Check the resource counts. */
 147         bcount = be64_to_cpu(d->d_bcount);
 148         icount = be64_to_cpu(d->d_icount);
 149         rcount = be64_to_cpu(d->d_rtbcount);
 150         fs_icount = percpu_counter_sum(&mp->m_icount);
 151
 152         /*
 153          * Check that usage doesn't exceed physical limits.  However, on
 154          * a reflink filesystem we're allowed to exceed physical space
 155          * if there are no quota limits.
 156          */
 157         if (xfs_sb_version_hasreflink(&mp->m_sb)) {
 158                 if (mp->m_sb.sb_dblocks < bcount)
 159                         xchk_fblock_set_warning(sc, XFS_DATA_FORK,
 160                                         offset);
 161         } else {
 162                 if (mp->m_sb.sb_dblocks < bcount)
 163                         xchk_fblock_set_corrupt(sc, XFS_DATA_FORK,
 164                                         offset);
 165         }
 166         if (icount > fs_icount || rcount > mp->m_sb.sb_rblocks)
 167                 xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, offset);
 168
 169         /*
 170          * We can violate the hard limits if the admin suddenly sets a
 171          * lower limit than the actual usage.  However, we flag it for
 172          * admin review.
 173          */
 174         if (id != 0 && bhard != 0 && bcount > bhard)
 175                 xchk_fblock_set_warning(sc, XFS_DATA_FORK, offset);
 176         if (id != 0 && ihard != 0 && icount > ihard)
 177                 xchk_fblock_set_warning(sc, XFS_DATA_FORK, offset);
 178         if (id != 0 && rhard != 0 && rcount > rhard)
 179                 xchk_fblock_set_warning(sc, XFS_DATA_FORK, offset);
 180
 181         return 0;
 182 }
 183
 184 /* Check the quota's data fork. */
 185 STATIC int
 186 xchk_quota_data_fork(
 187         struct xfs_scrub        *sc)
 188 {
 189         struct xfs_bmbt_irec    irec = { 0 };
 190         struct xfs_iext_cursor  icur;
 191         struct xfs_quotainfo    *qi = sc->mp->m_quotainfo;
 192         struct xfs_ifork        *ifp;
 193         xfs_fileoff_t           max_dqid_off;
 194         int                     error = 0;
 195
 196         /* Invoke the fork scrubber. */
 197         error = xchk_metadata_inode_forks(sc);
 198         if (error || (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT))
 199                 return error;
 200
 201         /* Check for data fork problems that apply only to quota files. */
 202         max_dqid_off = ((xfs_dqid_t)-1) / qi->qi_dqperchunk;
 203         ifp = XFS_IFORK_PTR(sc->ip, XFS_DATA_FORK);
 204         for_each_xfs_iext(ifp, &icur, &irec) {
 205                 if (xchk_should_terminate(sc, &error))
 206                         break;
 207                 /*
 208                  * delalloc extents or blocks mapped above the highest
 209                  * quota id shouldn't happen.
 210                  */
 211                 if (isnullstartblock(irec.br_startblock) ||
 212                     irec.br_startoff > max_dqid_off ||
 213                     irec.br_startoff + irec.br_blockcount - 1 > max_dqid_off) {
 214                         xchk_fblock_set_corrupt(sc, XFS_DATA_FORK,
 215                                         irec.br_startoff);
 216                         break;
 217                 }
 218         }
 219
 220         return error;
 221 }
 222
 223 /* Scrub all of a quota type's items. */
 224 int
 225 xchk_quota(
 226         struct xfs_scrub        *sc)
 227 {
 228         struct xchk_quota_info  sqi;
 229         struct xfs_mount        *mp = sc->mp;
 230         struct xfs_quotainfo    *qi = mp->m_quotainfo;
 231         uint                    dqtype;
 232         int                     error = 0;
 233
 234         dqtype = xchk_quota_to_dqtype(sc);
 235
 236         /* Look for problem extents. */
 237         error = xchk_quota_data_fork(sc);
 238         if (error)
 239                 goto out;
 240         if (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)
 241                 goto out;
 242
 243         /*
 244          * Check all the quota items.  Now that we've checked the quota inode
 245          * data fork we have to drop ILOCK_EXCL to use the regular dquot
 246          * functions.
 247          */
 248         xfs_iunlock(sc->ip, sc->ilock_flags);
 249         sc->ilock_flags = 0;
 250         sqi.sc = sc;
 251         sqi.last_id = 0;
 252         error = xfs_qm_dqiterate(mp, dqtype, xchk_quota_item, &sqi);
 253         sc->ilock_flags = XFS_ILOCK_EXCL;
 254         xfs_ilock(sc->ip, sc->ilock_flags);
 255         if (!xchk_fblock_process_error(sc, XFS_DATA_FORK,
 256                         sqi.last_id * qi->qi_dqperchunk, &error))
 257                 goto out;
 258
 259 out:
 260         return error;
 261 }