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 } 262