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 "xfs_bmap.h" 18 #include "scrub/scrub.h" 19 #include "scrub/common.h" 20 21 /* Convert a scrub type code to a DQ flag, or return 0 if error. */ 22 static inline xfs_dqtype_t 23 xchk_quota_to_dqtype( 24 struct xfs_scrub *sc) 25 { 26 switch (sc->sm->sm_type) { 27 case XFS_SCRUB_TYPE_UQUOTA: 28 return XFS_DQTYPE_USER; 29 case XFS_SCRUB_TYPE_GQUOTA: 30 return XFS_DQTYPE_GROUP; 31 case XFS_SCRUB_TYPE_PQUOTA: 32 return XFS_DQTYPE_PROJ; 33 default: 34 return 0; 35 } 36 } 37 38 /* Set us up to scrub a quota. */ 39 int 40 xchk_setup_quota( 41 struct xfs_scrub *sc) 42 { 43 xfs_dqtype_t dqtype; 44 int error; 45 46 if (!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 53 if (!xfs_this_quota_on(sc->mp, dqtype)) 54 return -ENOENT; 55 56 error = xchk_setup_fs(sc); 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 xfs_dqtype_t 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_quotainfo *qi = mp->m_quotainfo; 83 xfs_fileoff_t offset; 84 xfs_ino_t fs_icount; 85 int error = 0; 86 87 if (xchk_should_terminate(sc, &error)) 88 return error; 89 90 /* 91 * Except for the root dquot, the actual dquot we got must either have 92 * the same or higher id as we saw before. 93 */ 94 offset = dq->q_id / qi->qi_dqperchunk; 95 if (dq->q_id && dq->q_id <= sqi->last_id) 96 xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, offset); 97 98 sqi->last_id = dq->q_id; 99 100 /* 101 * Warn if the hard limits are larger than the fs. 102 * Administrators can do this, though in production this seems 103 * suspect, which is why we flag it for review. 104 * 105 * Complain about corruption if the soft limit is greater than 106 * the hard limit. 107 */ 108 if (dq->q_blk.hardlimit > mp->m_sb.sb_dblocks) 109 xchk_fblock_set_warning(sc, XFS_DATA_FORK, offset); 110 if (dq->q_blk.softlimit > dq->q_blk.hardlimit) 111 xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, offset); 112 113 if (dq->q_ino.hardlimit > M_IGEO(mp)->maxicount) 114 xchk_fblock_set_warning(sc, XFS_DATA_FORK, offset); 115 if (dq->q_ino.softlimit > dq->q_ino.hardlimit) 116 xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, offset); 117 118 if (dq->q_rtb.hardlimit > mp->m_sb.sb_rblocks) 119 xchk_fblock_set_warning(sc, XFS_DATA_FORK, offset); 120 if (dq->q_rtb.softlimit > dq->q_rtb.hardlimit) 121 xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, offset); 122 123 /* Check the resource counts. */ 124 fs_icount = percpu_counter_sum(&mp->m_icount); 125 126 /* 127 * Check that usage doesn't exceed physical limits. However, on 128 * a reflink filesystem we're allowed to exceed physical space 129 * if there are no quota limits. 130 */ 131 if (xfs_has_reflink(mp)) { 132 if (mp->m_sb.sb_dblocks < dq->q_blk.count) 133 xchk_fblock_set_warning(sc, XFS_DATA_FORK, 134 offset); 135 } else { 136 if (mp->m_sb.sb_dblocks < dq->q_blk.count) 137 xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, 138 offset); 139 } 140 if (dq->q_ino.count > fs_icount || dq->q_rtb.count > mp->m_sb.sb_rblocks) 141 xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, offset); 142 143 /* 144 * We can violate the hard limits if the admin suddenly sets a 145 * lower limit than the actual usage. However, we flag it for 146 * admin review. 147 */ 148 if (dq->q_id == 0) 149 goto out; 150 151 if (dq->q_blk.hardlimit != 0 && 152 dq->q_blk.count > dq->q_blk.hardlimit) 153 xchk_fblock_set_warning(sc, XFS_DATA_FORK, offset); 154 155 if (dq->q_ino.hardlimit != 0 && 156 dq->q_ino.count > dq->q_ino.hardlimit) 157 xchk_fblock_set_warning(sc, XFS_DATA_FORK, offset); 158 159 if (dq->q_rtb.hardlimit != 0 && 160 dq->q_rtb.count > dq->q_rtb.hardlimit) 161 xchk_fblock_set_warning(sc, XFS_DATA_FORK, offset); 162 163 out: 164 if (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT) 165 return -ECANCELED; 166 167 return 0; 168 } 169 170 /* Check the quota's data fork. */ 171 STATIC int 172 xchk_quota_data_fork( 173 struct xfs_scrub *sc) 174 { 175 struct xfs_bmbt_irec irec = { 0 }; 176 struct xfs_iext_cursor icur; 177 struct xfs_quotainfo *qi = sc->mp->m_quotainfo; 178 struct xfs_ifork *ifp; 179 xfs_fileoff_t max_dqid_off; 180 int error = 0; 181 182 /* Invoke the fork scrubber. */ 183 error = xchk_metadata_inode_forks(sc); 184 if (error || (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)) 185 return error; 186 187 /* Check for data fork problems that apply only to quota files. */ 188 max_dqid_off = ((xfs_dqid_t)-1) / qi->qi_dqperchunk; 189 ifp = xfs_ifork_ptr(sc->ip, XFS_DATA_FORK); 190 for_each_xfs_iext(ifp, &icur, &irec) { 191 if (xchk_should_terminate(sc, &error)) 192 break; 193 194 /* 195 * delalloc/unwritten extents or blocks mapped above the highest 196 * quota id shouldn't happen. 197 */ 198 if (!xfs_bmap_is_written_extent(&irec) || 199 irec.br_startoff > max_dqid_off || 200 irec.br_startoff + irec.br_blockcount - 1 > max_dqid_off) { 201 xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, 202 irec.br_startoff); 203 break; 204 } 205 } 206 207 return error; 208 } 209 210 /* Scrub all of a quota type's items. */ 211 int 212 xchk_quota( 213 struct xfs_scrub *sc) 214 { 215 struct xchk_quota_info sqi; 216 struct xfs_mount *mp = sc->mp; 217 struct xfs_quotainfo *qi = mp->m_quotainfo; 218 xfs_dqtype_t dqtype; 219 int error = 0; 220 221 dqtype = xchk_quota_to_dqtype(sc); 222 223 /* Look for problem extents. */ 224 error = xchk_quota_data_fork(sc); 225 if (error) 226 goto out; 227 if (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT) 228 goto out; 229 230 /* 231 * Check all the quota items. Now that we've checked the quota inode 232 * data fork we have to drop ILOCK_EXCL to use the regular dquot 233 * functions. 234 */ 235 xfs_iunlock(sc->ip, sc->ilock_flags); 236 sc->ilock_flags = 0; 237 sqi.sc = sc; 238 sqi.last_id = 0; 239 error = xfs_qm_dqiterate(mp, dqtype, xchk_quota_item, &sqi); 240 sc->ilock_flags = XFS_ILOCK_EXCL; 241 xfs_ilock(sc->ip, sc->ilock_flags); 242 if (error == -ECANCELED) 243 error = 0; 244 if (!xchk_fblock_process_error(sc, XFS_DATA_FORK, 245 sqi.last_id * qi->qi_dqperchunk, &error)) 246 goto out; 247 248 out: 249 return error; 250 } 251