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 xfs_dqtype_t 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_DQTYPE_USER; 28 case XFS_SCRUB_TYPE_GQUOTA: 29 return XFS_DQTYPE_GROUP; 30 case XFS_SCRUB_TYPE_PQUOTA: 31 return XFS_DQTYPE_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 { 42 xfs_dqtype_t dqtype; 43 int error; 44 45 if (!XFS_IS_QUOTA_RUNNING(sc->mp) || !XFS_IS_QUOTA_ON(sc->mp)) 46 return -ENOENT; 47 48 dqtype = xchk_quota_to_dqtype(sc); 49 if (dqtype == 0) 50 return -EINVAL; 51 sc->flags |= XCHK_HAS_QUOTAOFFLOCK; 52 mutex_lock(&sc->mp->m_quotainfo->qi_quotaofflock); 53 if (!xfs_this_quota_on(sc->mp, dqtype)) 54 return -ENOENT; 55 error = xchk_setup_fs(sc); 56 if (error) 57 return error; 58 sc->ip = xfs_quota_inode(sc->mp, dqtype); 59 xfs_ilock(sc->ip, XFS_ILOCK_EXCL); 60 sc->ilock_flags = XFS_ILOCK_EXCL; 61 return 0; 62 } 63 64 /* Quotas. */ 65 66 struct xchk_quota_info { 67 struct xfs_scrub *sc; 68 xfs_dqid_t last_id; 69 }; 70 71 /* Scrub the fields in an individual quota item. */ 72 STATIC int 73 xchk_quota_item( 74 struct xfs_dquot *dq, 75 xfs_dqtype_t dqtype, 76 void *priv) 77 { 78 struct xchk_quota_info *sqi = priv; 79 struct xfs_scrub *sc = sqi->sc; 80 struct xfs_mount *mp = sc->mp; 81 struct xfs_quotainfo *qi = mp->m_quotainfo; 82 xfs_fileoff_t offset; 83 xfs_ino_t fs_icount; 84 int error = 0; 85 86 if (xchk_should_terminate(sc, &error)) 87 return -ECANCELED; 88 89 /* 90 * Except for the root dquot, the actual dquot we got must either have 91 * the same or higher id as we saw before. 92 */ 93 offset = dq->q_id / qi->qi_dqperchunk; 94 if (dq->q_id && dq->q_id <= sqi->last_id) 95 xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, offset); 96 97 sqi->last_id = dq->q_id; 98 99 /* 100 * Warn if the hard limits are larger than the fs. 101 * Administrators can do this, though in production this seems 102 * suspect, which is why we flag it for review. 103 * 104 * Complain about corruption if the soft limit is greater than 105 * the hard limit. 106 */ 107 if (dq->q_blk.hardlimit > mp->m_sb.sb_dblocks) 108 xchk_fblock_set_warning(sc, XFS_DATA_FORK, offset); 109 if (dq->q_blk.softlimit > dq->q_blk.hardlimit) 110 xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, offset); 111 112 if (dq->q_ino.hardlimit > M_IGEO(mp)->maxicount) 113 xchk_fblock_set_warning(sc, XFS_DATA_FORK, offset); 114 if (dq->q_ino.softlimit > dq->q_ino.hardlimit) 115 xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, offset); 116 117 if (dq->q_rtb.hardlimit > mp->m_sb.sb_rblocks) 118 xchk_fblock_set_warning(sc, XFS_DATA_FORK, offset); 119 if (dq->q_rtb.softlimit > dq->q_rtb.hardlimit) 120 xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, offset); 121 122 /* Check the resource counts. */ 123 fs_icount = percpu_counter_sum(&mp->m_icount); 124 125 /* 126 * Check that usage doesn't exceed physical limits. However, on 127 * a reflink filesystem we're allowed to exceed physical space 128 * if there are no quota limits. 129 */ 130 if (xfs_sb_version_hasreflink(&mp->m_sb)) { 131 if (mp->m_sb.sb_dblocks < dq->q_blk.count) 132 xchk_fblock_set_warning(sc, XFS_DATA_FORK, 133 offset); 134 } else { 135 if (mp->m_sb.sb_dblocks < dq->q_blk.count) 136 xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, 137 offset); 138 } 139 if (dq->q_ino.count > fs_icount || dq->q_rtb.count > mp->m_sb.sb_rblocks) 140 xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, offset); 141 142 /* 143 * We can violate the hard limits if the admin suddenly sets a 144 * lower limit than the actual usage. However, we flag it for 145 * admin review. 146 */ 147 if (dq->q_id == 0) 148 goto out; 149 150 if (dq->q_blk.hardlimit != 0 && 151 dq->q_blk.count > dq->q_blk.hardlimit) 152 xchk_fblock_set_warning(sc, XFS_DATA_FORK, offset); 153 154 if (dq->q_ino.hardlimit != 0 && 155 dq->q_ino.count > dq->q_ino.hardlimit) 156 xchk_fblock_set_warning(sc, XFS_DATA_FORK, offset); 157 158 if (dq->q_rtb.hardlimit != 0 && 159 dq->q_rtb.count > dq->q_rtb.hardlimit) 160 xchk_fblock_set_warning(sc, XFS_DATA_FORK, offset); 161 162 out: 163 if (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT) 164 return -ECANCELED; 165 166 return 0; 167 } 168 169 /* Check the quota's data fork. */ 170 STATIC int 171 xchk_quota_data_fork( 172 struct xfs_scrub *sc) 173 { 174 struct xfs_bmbt_irec irec = { 0 }; 175 struct xfs_iext_cursor icur; 176 struct xfs_quotainfo *qi = sc->mp->m_quotainfo; 177 struct xfs_ifork *ifp; 178 xfs_fileoff_t max_dqid_off; 179 int error = 0; 180 181 /* Invoke the fork scrubber. */ 182 error = xchk_metadata_inode_forks(sc); 183 if (error || (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)) 184 return error; 185 186 /* Check for data fork problems that apply only to quota files. */ 187 max_dqid_off = ((xfs_dqid_t)-1) / qi->qi_dqperchunk; 188 ifp = XFS_IFORK_PTR(sc->ip, XFS_DATA_FORK); 189 for_each_xfs_iext(ifp, &icur, &irec) { 190 if (xchk_should_terminate(sc, &error)) 191 break; 192 /* 193 * delalloc extents or blocks mapped above the highest 194 * quota id shouldn't happen. 195 */ 196 if (isnullstartblock(irec.br_startblock) || 197 irec.br_startoff > max_dqid_off || 198 irec.br_startoff + irec.br_blockcount - 1 > max_dqid_off) { 199 xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, 200 irec.br_startoff); 201 break; 202 } 203 } 204 205 return error; 206 } 207 208 /* Scrub all of a quota type's items. */ 209 int 210 xchk_quota( 211 struct xfs_scrub *sc) 212 { 213 struct xchk_quota_info sqi; 214 struct xfs_mount *mp = sc->mp; 215 struct xfs_quotainfo *qi = mp->m_quotainfo; 216 xfs_dqtype_t dqtype; 217 int error = 0; 218 219 dqtype = xchk_quota_to_dqtype(sc); 220 221 /* Look for problem extents. */ 222 error = xchk_quota_data_fork(sc); 223 if (error) 224 goto out; 225 if (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT) 226 goto out; 227 228 /* 229 * Check all the quota items. Now that we've checked the quota inode 230 * data fork we have to drop ILOCK_EXCL to use the regular dquot 231 * functions. 232 */ 233 xfs_iunlock(sc->ip, sc->ilock_flags); 234 sc->ilock_flags = 0; 235 sqi.sc = sc; 236 sqi.last_id = 0; 237 error = xfs_qm_dqiterate(mp, dqtype, xchk_quota_item, &sqi); 238 sc->ilock_flags = XFS_ILOCK_EXCL; 239 xfs_ilock(sc->ip, sc->ilock_flags); 240 if (error == -ECANCELED) 241 error = 0; 242 if (!xchk_fblock_process_error(sc, XFS_DATA_FORK, 243 sqi.last_id * qi->qi_dqperchunk, &error)) 244 goto out; 245 246 out: 247 return error; 248 } 249