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_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_inode.h"
  19 #include "xfs_inode_fork.h"
  20 #include "xfs_alloc.h"
  21 #include "xfs_bmap.h"
  22 #include "xfs_quota.h"
  23 #include "xfs_qm.h"
  24 #include "xfs_dquot.h"
  25 #include "xfs_dquot_item.h"
  26 #include "scrub/xfs_scrub.h"
  27 #include "scrub/scrub.h"
  28 #include "scrub/common.h"
  29 #include "scrub/trace.h"
  30
  31 /* Convert a scrub type code to a DQ flag, or return 0 if error. */
  32 static inline uint
  33 xchk_quota_to_dqtype(
  34         struct xfs_scrub        *sc)
  35 {
  36         switch (sc->sm->sm_type) {
  37         case XFS_SCRUB_TYPE_UQUOTA:
  38                 return XFS_DQ_USER;
  39         case XFS_SCRUB_TYPE_GQUOTA:
  40                 return XFS_DQ_GROUP;
  41         case XFS_SCRUB_TYPE_PQUOTA:
  42                 return XFS_DQ_PROJ;
  43         default:
  44                 return 0;
  45         }
  46 }
  47
  48 /* Set us up to scrub a quota. */
  49 int
  50 xchk_setup_quota(
  51         struct xfs_scrub        *sc,
  52         struct xfs_inode        *ip)
  53 {
  54         uint                    dqtype;
  55         int                     error;
  56
  57         if (!XFS_IS_QUOTA_RUNNING(sc->mp) || !XFS_IS_QUOTA_ON(sc->mp))
  58                 return -ENOENT;
  59
  60         dqtype = xchk_quota_to_dqtype(sc);
  61         if (dqtype == 0)
  62                 return -EINVAL;
  63         sc->flags |= XCHK_HAS_QUOTAOFFLOCK;
  64         mutex_lock(&sc->mp->m_quotainfo->qi_quotaofflock);
  65         if (!xfs_this_quota_on(sc->mp, dqtype))
  66                 return -ENOENT;
  67         error = xchk_setup_fs(sc, ip);
  68         if (error)
  69                 return error;
  70         sc->ip = xfs_quota_inode(sc->mp, dqtype);
  71         xfs_ilock(sc->ip, XFS_ILOCK_EXCL);
  72         sc->ilock_flags = XFS_ILOCK_EXCL;
  73         return 0;
  74 }
  75
  76 /* Quotas. */
  77
  78 struct xchk_quota_info {
  79         struct xfs_scrub        *sc;
  80         xfs_dqid_t              last_id;
  81 };
  82
  83 /* Scrub the fields in an individual quota item. */
  84 STATIC int
  85 xchk_quota_item(
  86         struct xfs_dquot        *dq,
  87         uint                    dqtype,
  88         void                    *priv)
  89 {
  90         struct xchk_quota_info  *sqi = priv;
  91         struct xfs_scrub        *sc = sqi->sc;
  92         struct xfs_mount        *mp = sc->mp;
  93         struct xfs_disk_dquot   *d = &dq->q_core;
  94         struct xfs_quotainfo    *qi = mp->m_quotainfo;
  95         xfs_fileoff_t           offset;
  96         unsigned long long      bsoft;
  97         unsigned long long      isoft;
  98         unsigned long long      rsoft;
  99         unsigned long long      bhard;
 100         unsigned long long      ihard;
 101         unsigned long long      rhard;
 102         unsigned long long      bcount;
 103         unsigned long long      icount;
 104         unsigned long long      rcount;
 105         xfs_ino_t               fs_icount;
 106         xfs_dqid_t              id = be32_to_cpu(d->d_id);
 107
 108         /*
 109          * Except for the root dquot, the actual dquot we got must either have
 110          * the same or higher id as we saw before.
 111          */
 112         offset = id / qi->qi_dqperchunk;
 113         if (id && id <= sqi->last_id)
 114                 xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, offset);
 115
 116         sqi->last_id = id;
 117
 118         /* Did we get the dquot type we wanted? */
 119         if (dqtype != (d->d_flags & XFS_DQ_ALLTYPES))
 120                 xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, offset);
 121
 122         if (d->d_pad0 != cpu_to_be32(0) || d->d_pad != cpu_to_be16(0))
 123                 xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, offset);
 124
 125         /* Check the limits. */
 126         bhard = be64_to_cpu(d->d_blk_hardlimit);
 127         ihard = be64_to_cpu(d->d_ino_hardlimit);
 128         rhard = be64_to_cpu(d->d_rtb_hardlimit);
 129
 130         bsoft = be64_to_cpu(d->d_blk_softlimit);
 131         isoft = be64_to_cpu(d->d_ino_softlimit);
 132         rsoft = be64_to_cpu(d->d_rtb_softlimit);
 133
 134         /*
 135          * Warn if the hard limits are larger than the fs.
 136          * Administrators can do this, though in production this seems
 137          * suspect, which is why we flag it for review.
 138          *
 139          * Complain about corruption if the soft limit is greater than
 140          * the hard limit.
 141          */
 142         if (bhard > mp->m_sb.sb_dblocks)
 143                 xchk_fblock_set_warning(sc, XFS_DATA_FORK, offset);
 144         if (bsoft > bhard)
 145                 xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, offset);
 146
 147         if (ihard > mp->m_maxicount)
 148                 xchk_fblock_set_warning(sc, XFS_DATA_FORK, offset);
 149         if (isoft > ihard)
 150                 xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, offset);
 151
 152         if (rhard > mp->m_sb.sb_rblocks)
 153                 xchk_fblock_set_warning(sc, XFS_DATA_FORK, offset);
 154         if (rsoft > rhard)
 155                 xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, offset);
 156
 157         /* Check the resource counts. */
 158         bcount = be64_to_cpu(d->d_bcount);
 159         icount = be64_to_cpu(d->d_icount);
 160         rcount = be64_to_cpu(d->d_rtbcount);
 161         fs_icount = percpu_counter_sum(&mp->m_icount);
 162
 163         /*
 164          * Check that usage doesn't exceed physical limits.  However, on
 165          * a reflink filesystem we're allowed to exceed physical space
 166          * if there are no quota limits.
 167          */
 168         if (xfs_sb_version_hasreflink(&mp->m_sb)) {
 169                 if (mp->m_sb.sb_dblocks < bcount)
 170                         xchk_fblock_set_warning(sc, XFS_DATA_FORK,
 171                                         offset);
 172         } else {
 173                 if (mp->m_sb.sb_dblocks < bcount)
 174                         xchk_fblock_set_corrupt(sc, XFS_DATA_FORK,
 175                                         offset);
 176         }
 177         if (icount > fs_icount || rcount > mp->m_sb.sb_rblocks)
 178                 xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, offset);
 179
 180         /*
 181          * We can violate the hard limits if the admin suddenly sets a
 182          * lower limit than the actual usage.  However, we flag it for
 183          * admin review.
 184          */
 185         if (id != 0 && bhard != 0 && bcount > bhard)
 186                 xchk_fblock_set_warning(sc, XFS_DATA_FORK, offset);
 187         if (id != 0 && ihard != 0 && icount > ihard)
 188                 xchk_fblock_set_warning(sc, XFS_DATA_FORK, offset);
 189         if (id != 0 && rhard != 0 && rcount > rhard)
 190                 xchk_fblock_set_warning(sc, XFS_DATA_FORK, offset);
 191
 192         return 0;
 193 }
 194
 195 /* Check the quota's data fork. */
 196 STATIC int
 197 xchk_quota_data_fork(
 198         struct xfs_scrub        *sc)
 199 {
 200         struct xfs_bmbt_irec    irec = { 0 };
 201         struct xfs_iext_cursor  icur;
 202         struct xfs_quotainfo    *qi = sc->mp->m_quotainfo;
 203         struct xfs_ifork        *ifp;
 204         xfs_fileoff_t           max_dqid_off;
 205         int                     error = 0;
 206
 207         /* Invoke the fork scrubber. */
 208         error = xchk_metadata_inode_forks(sc);
 209         if (error || (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT))
 210                 return error;
 211
 212         /* Check for data fork problems that apply only to quota files. */
 213         max_dqid_off = ((xfs_dqid_t)-1) / qi->qi_dqperchunk;
 214         ifp = XFS_IFORK_PTR(sc->ip, XFS_DATA_FORK);
 215         for_each_xfs_iext(ifp, &icur, &irec) {
 216                 if (xchk_should_terminate(sc, &error))
 217                         break;
 218                 /*
 219                  * delalloc extents or blocks mapped above the highest
 220                  * quota id shouldn't happen.
 221                  */
 222                 if (isnullstartblock(irec.br_startblock) ||
 223                     irec.br_startoff > max_dqid_off ||
 224                     irec.br_startoff + irec.br_blockcount - 1 > max_dqid_off) {
 225                         xchk_fblock_set_corrupt(sc, XFS_DATA_FORK,
 226                                         irec.br_startoff);
 227                         break;
 228                 }
 229         }
 230
 231         return error;
 232 }
 233
 234 /* Scrub all of a quota type's items. */
 235 int
 236 xchk_quota(
 237         struct xfs_scrub        *sc)
 238 {
 239         struct xchk_quota_info  sqi;
 240         struct xfs_mount        *mp = sc->mp;
 241         struct xfs_quotainfo    *qi = mp->m_quotainfo;
 242         uint                    dqtype;
 243         int                     error = 0;
 244
 245         dqtype = xchk_quota_to_dqtype(sc);
 246
 247         /* Look for problem extents. */
 248         error = xchk_quota_data_fork(sc);
 249         if (error)
 250                 goto out;
 251         if (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)
 252                 goto out;
 253
 254         /*
 255          * Check all the quota items.  Now that we've checked the quota inode
 256          * data fork we have to drop ILOCK_EXCL to use the regular dquot
 257          * functions.
 258          */
 259         xfs_iunlock(sc->ip, sc->ilock_flags);
 260         sc->ilock_flags = 0;
 261         sqi.sc = sc;
 262         sqi.last_id = 0;
 263         error = xfs_qm_dqiterate(mp, dqtype, xchk_quota_item, &sqi);
 264         sc->ilock_flags = XFS_ILOCK_EXCL;
 265         xfs_ilock(sc->ip, sc->ilock_flags);
 266         if (!xchk_fblock_process_error(sc, XFS_DATA_FORK,
 267                         sqi.last_id * qi->qi_dqperchunk, &error))
 268                 goto out;
 269
 270 out:
 271         return error;
 272 }