1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Quota code necessary even when VFS quota support is not compiled 4 * into the kernel. The interesting stuff is over in dquot.c, here 5 * we have symbols for initial quotactl(2) handling, the sysctl(2) 6 * variables, etc - things needed even when quota support disabled. 7 */ 8 9 #include <linux/fs.h> 10 #include <linux/namei.h> 11 #include <linux/slab.h> 12 #include <asm/current.h> 13 #include <linux/uaccess.h> 14 #include <linux/kernel.h> 15 #include <linux/security.h> 16 #include <linux/syscalls.h> 17 #include <linux/capability.h> 18 #include <linux/quotaops.h> 19 #include <linux/types.h> 20 #include <linux/writeback.h> 21 #include <linux/nospec.h> 22 23 static int check_quotactl_permission(struct super_block *sb, int type, int cmd, 24 qid_t id) 25 { 26 switch (cmd) { 27 /* these commands do not require any special privilegues */ 28 case Q_GETFMT: 29 case Q_SYNC: 30 case Q_GETINFO: 31 case Q_XGETQSTAT: 32 case Q_XGETQSTATV: 33 case Q_XQUOTASYNC: 34 break; 35 /* allow to query information for dquots we "own" */ 36 case Q_GETQUOTA: 37 case Q_XGETQUOTA: 38 if ((type == USRQUOTA && uid_eq(current_euid(), make_kuid(current_user_ns(), id))) || 39 (type == GRPQUOTA && in_egroup_p(make_kgid(current_user_ns(), id)))) 40 break; 41 /*FALLTHROUGH*/ 42 default: 43 if (!capable(CAP_SYS_ADMIN)) 44 return -EPERM; 45 } 46 47 return security_quotactl(cmd, type, id, sb); 48 } 49 50 static void quota_sync_one(struct super_block *sb, void *arg) 51 { 52 int type = *(int *)arg; 53 54 if (sb->s_qcop && sb->s_qcop->quota_sync && 55 (sb->s_quota_types & (1 << type))) 56 sb->s_qcop->quota_sync(sb, type); 57 } 58 59 static int quota_sync_all(int type) 60 { 61 int ret; 62 63 if (type >= MAXQUOTAS) 64 return -EINVAL; 65 ret = security_quotactl(Q_SYNC, type, 0, NULL); 66 if (!ret) 67 iterate_supers(quota_sync_one, &type); 68 return ret; 69 } 70 71 unsigned int qtype_enforce_flag(int type) 72 { 73 switch (type) { 74 case USRQUOTA: 75 return FS_QUOTA_UDQ_ENFD; 76 case GRPQUOTA: 77 return FS_QUOTA_GDQ_ENFD; 78 case PRJQUOTA: 79 return FS_QUOTA_PDQ_ENFD; 80 } 81 return 0; 82 } 83 84 static int quota_quotaon(struct super_block *sb, int type, qid_t id, 85 const struct path *path) 86 { 87 if (!sb->s_qcop->quota_on && !sb->s_qcop->quota_enable) 88 return -ENOSYS; 89 if (sb->s_qcop->quota_enable) 90 return sb->s_qcop->quota_enable(sb, qtype_enforce_flag(type)); 91 if (IS_ERR(path)) 92 return PTR_ERR(path); 93 return sb->s_qcop->quota_on(sb, type, id, path); 94 } 95 96 static int quota_quotaoff(struct super_block *sb, int type) 97 { 98 if (!sb->s_qcop->quota_off && !sb->s_qcop->quota_disable) 99 return -ENOSYS; 100 if (sb->s_qcop->quota_disable) 101 return sb->s_qcop->quota_disable(sb, qtype_enforce_flag(type)); 102 return sb->s_qcop->quota_off(sb, type); 103 } 104 105 static int quota_getfmt(struct super_block *sb, int type, void __user *addr) 106 { 107 __u32 fmt; 108 109 if (!sb_has_quota_active(sb, type)) 110 return -ESRCH; 111 fmt = sb_dqopt(sb)->info[type].dqi_format->qf_fmt_id; 112 if (copy_to_user(addr, &fmt, sizeof(fmt))) 113 return -EFAULT; 114 return 0; 115 } 116 117 static int quota_getinfo(struct super_block *sb, int type, void __user *addr) 118 { 119 struct qc_state state; 120 struct qc_type_state *tstate; 121 struct if_dqinfo uinfo; 122 int ret; 123 124 if (!sb->s_qcop->get_state) 125 return -ENOSYS; 126 ret = sb->s_qcop->get_state(sb, &state); 127 if (ret) 128 return ret; 129 tstate = state.s_state + type; 130 if (!(tstate->flags & QCI_ACCT_ENABLED)) 131 return -ESRCH; 132 memset(&uinfo, 0, sizeof(uinfo)); 133 uinfo.dqi_bgrace = tstate->spc_timelimit; 134 uinfo.dqi_igrace = tstate->ino_timelimit; 135 if (tstate->flags & QCI_SYSFILE) 136 uinfo.dqi_flags |= DQF_SYS_FILE; 137 if (tstate->flags & QCI_ROOT_SQUASH) 138 uinfo.dqi_flags |= DQF_ROOT_SQUASH; 139 uinfo.dqi_valid = IIF_ALL; 140 if (copy_to_user(addr, &uinfo, sizeof(uinfo))) 141 return -EFAULT; 142 return 0; 143 } 144 145 static int quota_setinfo(struct super_block *sb, int type, void __user *addr) 146 { 147 struct if_dqinfo info; 148 struct qc_info qinfo; 149 150 if (copy_from_user(&info, addr, sizeof(info))) 151 return -EFAULT; 152 if (!sb->s_qcop->set_info) 153 return -ENOSYS; 154 if (info.dqi_valid & ~(IIF_FLAGS | IIF_BGRACE | IIF_IGRACE)) 155 return -EINVAL; 156 memset(&qinfo, 0, sizeof(qinfo)); 157 if (info.dqi_valid & IIF_FLAGS) { 158 if (info.dqi_flags & ~DQF_SETINFO_MASK) 159 return -EINVAL; 160 if (info.dqi_flags & DQF_ROOT_SQUASH) 161 qinfo.i_flags |= QCI_ROOT_SQUASH; 162 qinfo.i_fieldmask |= QC_FLAGS; 163 } 164 if (info.dqi_valid & IIF_BGRACE) { 165 qinfo.i_spc_timelimit = info.dqi_bgrace; 166 qinfo.i_fieldmask |= QC_SPC_TIMER; 167 } 168 if (info.dqi_valid & IIF_IGRACE) { 169 qinfo.i_ino_timelimit = info.dqi_igrace; 170 qinfo.i_fieldmask |= QC_INO_TIMER; 171 } 172 return sb->s_qcop->set_info(sb, type, &qinfo); 173 } 174 175 static inline qsize_t qbtos(qsize_t blocks) 176 { 177 return blocks << QIF_DQBLKSIZE_BITS; 178 } 179 180 static inline qsize_t stoqb(qsize_t space) 181 { 182 return (space + QIF_DQBLKSIZE - 1) >> QIF_DQBLKSIZE_BITS; 183 } 184 185 static void copy_to_if_dqblk(struct if_dqblk *dst, struct qc_dqblk *src) 186 { 187 memset(dst, 0, sizeof(*dst)); 188 dst->dqb_bhardlimit = stoqb(src->d_spc_hardlimit); 189 dst->dqb_bsoftlimit = stoqb(src->d_spc_softlimit); 190 dst->dqb_curspace = src->d_space; 191 dst->dqb_ihardlimit = src->d_ino_hardlimit; 192 dst->dqb_isoftlimit = src->d_ino_softlimit; 193 dst->dqb_curinodes = src->d_ino_count; 194 dst->dqb_btime = src->d_spc_timer; 195 dst->dqb_itime = src->d_ino_timer; 196 dst->dqb_valid = QIF_ALL; 197 } 198 199 static int quota_getquota(struct super_block *sb, int type, qid_t id, 200 void __user *addr) 201 { 202 struct kqid qid; 203 struct qc_dqblk fdq; 204 struct if_dqblk idq; 205 int ret; 206 207 if (!sb->s_qcop->get_dqblk) 208 return -ENOSYS; 209 qid = make_kqid(current_user_ns(), type, id); 210 if (!qid_has_mapping(sb->s_user_ns, qid)) 211 return -EINVAL; 212 ret = sb->s_qcop->get_dqblk(sb, qid, &fdq); 213 if (ret) 214 return ret; 215 copy_to_if_dqblk(&idq, &fdq); 216 if (copy_to_user(addr, &idq, sizeof(idq))) 217 return -EFAULT; 218 return 0; 219 } 220 221 /* 222 * Return quota for next active quota >= this id, if any exists, 223 * otherwise return -ENOENT via ->get_nextdqblk 224 */ 225 static int quota_getnextquota(struct super_block *sb, int type, qid_t id, 226 void __user *addr) 227 { 228 struct kqid qid; 229 struct qc_dqblk fdq; 230 struct if_nextdqblk idq; 231 int ret; 232 233 if (!sb->s_qcop->get_nextdqblk) 234 return -ENOSYS; 235 qid = make_kqid(current_user_ns(), type, id); 236 if (!qid_has_mapping(sb->s_user_ns, qid)) 237 return -EINVAL; 238 ret = sb->s_qcop->get_nextdqblk(sb, &qid, &fdq); 239 if (ret) 240 return ret; 241 /* struct if_nextdqblk is a superset of struct if_dqblk */ 242 copy_to_if_dqblk((struct if_dqblk *)&idq, &fdq); 243 idq.dqb_id = from_kqid(current_user_ns(), qid); 244 if (copy_to_user(addr, &idq, sizeof(idq))) 245 return -EFAULT; 246 return 0; 247 } 248 249 static void copy_from_if_dqblk(struct qc_dqblk *dst, struct if_dqblk *src) 250 { 251 dst->d_spc_hardlimit = qbtos(src->dqb_bhardlimit); 252 dst->d_spc_softlimit = qbtos(src->dqb_bsoftlimit); 253 dst->d_space = src->dqb_curspace; 254 dst->d_ino_hardlimit = src->dqb_ihardlimit; 255 dst->d_ino_softlimit = src->dqb_isoftlimit; 256 dst->d_ino_count = src->dqb_curinodes; 257 dst->d_spc_timer = src->dqb_btime; 258 dst->d_ino_timer = src->dqb_itime; 259 260 dst->d_fieldmask = 0; 261 if (src->dqb_valid & QIF_BLIMITS) 262 dst->d_fieldmask |= QC_SPC_SOFT | QC_SPC_HARD; 263 if (src->dqb_valid & QIF_SPACE) 264 dst->d_fieldmask |= QC_SPACE; 265 if (src->dqb_valid & QIF_ILIMITS) 266 dst->d_fieldmask |= QC_INO_SOFT | QC_INO_HARD; 267 if (src->dqb_valid & QIF_INODES) 268 dst->d_fieldmask |= QC_INO_COUNT; 269 if (src->dqb_valid & QIF_BTIME) 270 dst->d_fieldmask |= QC_SPC_TIMER; 271 if (src->dqb_valid & QIF_ITIME) 272 dst->d_fieldmask |= QC_INO_TIMER; 273 } 274 275 static int quota_setquota(struct super_block *sb, int type, qid_t id, 276 void __user *addr) 277 { 278 struct qc_dqblk fdq; 279 struct if_dqblk idq; 280 struct kqid qid; 281 282 if (copy_from_user(&idq, addr, sizeof(idq))) 283 return -EFAULT; 284 if (!sb->s_qcop->set_dqblk) 285 return -ENOSYS; 286 qid = make_kqid(current_user_ns(), type, id); 287 if (!qid_has_mapping(sb->s_user_ns, qid)) 288 return -EINVAL; 289 copy_from_if_dqblk(&fdq, &idq); 290 return sb->s_qcop->set_dqblk(sb, qid, &fdq); 291 } 292 293 static int quota_enable(struct super_block *sb, void __user *addr) 294 { 295 __u32 flags; 296 297 if (copy_from_user(&flags, addr, sizeof(flags))) 298 return -EFAULT; 299 if (!sb->s_qcop->quota_enable) 300 return -ENOSYS; 301 return sb->s_qcop->quota_enable(sb, flags); 302 } 303 304 static int quota_disable(struct super_block *sb, void __user *addr) 305 { 306 __u32 flags; 307 308 if (copy_from_user(&flags, addr, sizeof(flags))) 309 return -EFAULT; 310 if (!sb->s_qcop->quota_disable) 311 return -ENOSYS; 312 return sb->s_qcop->quota_disable(sb, flags); 313 } 314 315 static int quota_state_to_flags(struct qc_state *state) 316 { 317 int flags = 0; 318 319 if (state->s_state[USRQUOTA].flags & QCI_ACCT_ENABLED) 320 flags |= FS_QUOTA_UDQ_ACCT; 321 if (state->s_state[USRQUOTA].flags & QCI_LIMITS_ENFORCED) 322 flags |= FS_QUOTA_UDQ_ENFD; 323 if (state->s_state[GRPQUOTA].flags & QCI_ACCT_ENABLED) 324 flags |= FS_QUOTA_GDQ_ACCT; 325 if (state->s_state[GRPQUOTA].flags & QCI_LIMITS_ENFORCED) 326 flags |= FS_QUOTA_GDQ_ENFD; 327 if (state->s_state[PRJQUOTA].flags & QCI_ACCT_ENABLED) 328 flags |= FS_QUOTA_PDQ_ACCT; 329 if (state->s_state[PRJQUOTA].flags & QCI_LIMITS_ENFORCED) 330 flags |= FS_QUOTA_PDQ_ENFD; 331 return flags; 332 } 333 334 static int quota_getstate(struct super_block *sb, int type, 335 struct fs_quota_stat *fqs) 336 { 337 struct qc_state state; 338 int ret; 339 340 memset(&state, 0, sizeof (struct qc_state)); 341 ret = sb->s_qcop->get_state(sb, &state); 342 if (ret < 0) 343 return ret; 344 345 memset(fqs, 0, sizeof(*fqs)); 346 fqs->qs_version = FS_QSTAT_VERSION; 347 fqs->qs_flags = quota_state_to_flags(&state); 348 /* No quota enabled? */ 349 if (!fqs->qs_flags) 350 return -ENOSYS; 351 fqs->qs_incoredqs = state.s_incoredqs; 352 353 fqs->qs_btimelimit = state.s_state[type].spc_timelimit; 354 fqs->qs_itimelimit = state.s_state[type].ino_timelimit; 355 fqs->qs_rtbtimelimit = state.s_state[type].rt_spc_timelimit; 356 fqs->qs_bwarnlimit = state.s_state[type].spc_warnlimit; 357 fqs->qs_iwarnlimit = state.s_state[type].ino_warnlimit; 358 359 /* Inodes may be allocated even if inactive; copy out if present */ 360 if (state.s_state[USRQUOTA].ino) { 361 fqs->qs_uquota.qfs_ino = state.s_state[USRQUOTA].ino; 362 fqs->qs_uquota.qfs_nblks = state.s_state[USRQUOTA].blocks; 363 fqs->qs_uquota.qfs_nextents = state.s_state[USRQUOTA].nextents; 364 } 365 if (state.s_state[GRPQUOTA].ino) { 366 fqs->qs_gquota.qfs_ino = state.s_state[GRPQUOTA].ino; 367 fqs->qs_gquota.qfs_nblks = state.s_state[GRPQUOTA].blocks; 368 fqs->qs_gquota.qfs_nextents = state.s_state[GRPQUOTA].nextents; 369 } 370 if (state.s_state[PRJQUOTA].ino) { 371 /* 372 * Q_XGETQSTAT doesn't have room for both group and project 373 * quotas. So, allow the project quota values to be copied out 374 * only if there is no group quota information available. 375 */ 376 if (!(state.s_state[GRPQUOTA].flags & QCI_ACCT_ENABLED)) { 377 fqs->qs_gquota.qfs_ino = state.s_state[PRJQUOTA].ino; 378 fqs->qs_gquota.qfs_nblks = 379 state.s_state[PRJQUOTA].blocks; 380 fqs->qs_gquota.qfs_nextents = 381 state.s_state[PRJQUOTA].nextents; 382 } 383 } 384 return 0; 385 } 386 387 static int quota_getxstate(struct super_block *sb, int type, void __user *addr) 388 { 389 struct fs_quota_stat fqs; 390 int ret; 391 392 if (!sb->s_qcop->get_state) 393 return -ENOSYS; 394 ret = quota_getstate(sb, type, &fqs); 395 if (!ret && copy_to_user(addr, &fqs, sizeof(fqs))) 396 return -EFAULT; 397 return ret; 398 } 399 400 static int quota_getstatev(struct super_block *sb, int type, 401 struct fs_quota_statv *fqs) 402 { 403 struct qc_state state; 404 int ret; 405 406 memset(&state, 0, sizeof (struct qc_state)); 407 ret = sb->s_qcop->get_state(sb, &state); 408 if (ret < 0) 409 return ret; 410 411 memset(fqs, 0, sizeof(*fqs)); 412 fqs->qs_version = FS_QSTAT_VERSION; 413 fqs->qs_flags = quota_state_to_flags(&state); 414 /* No quota enabled? */ 415 if (!fqs->qs_flags) 416 return -ENOSYS; 417 fqs->qs_incoredqs = state.s_incoredqs; 418 419 fqs->qs_btimelimit = state.s_state[type].spc_timelimit; 420 fqs->qs_itimelimit = state.s_state[type].ino_timelimit; 421 fqs->qs_rtbtimelimit = state.s_state[type].rt_spc_timelimit; 422 fqs->qs_bwarnlimit = state.s_state[type].spc_warnlimit; 423 fqs->qs_iwarnlimit = state.s_state[type].ino_warnlimit; 424 425 /* Inodes may be allocated even if inactive; copy out if present */ 426 if (state.s_state[USRQUOTA].ino) { 427 fqs->qs_uquota.qfs_ino = state.s_state[USRQUOTA].ino; 428 fqs->qs_uquota.qfs_nblks = state.s_state[USRQUOTA].blocks; 429 fqs->qs_uquota.qfs_nextents = state.s_state[USRQUOTA].nextents; 430 } 431 if (state.s_state[GRPQUOTA].ino) { 432 fqs->qs_gquota.qfs_ino = state.s_state[GRPQUOTA].ino; 433 fqs->qs_gquota.qfs_nblks = state.s_state[GRPQUOTA].blocks; 434 fqs->qs_gquota.qfs_nextents = state.s_state[GRPQUOTA].nextents; 435 } 436 if (state.s_state[PRJQUOTA].ino) { 437 fqs->qs_pquota.qfs_ino = state.s_state[PRJQUOTA].ino; 438 fqs->qs_pquota.qfs_nblks = state.s_state[PRJQUOTA].blocks; 439 fqs->qs_pquota.qfs_nextents = state.s_state[PRJQUOTA].nextents; 440 } 441 return 0; 442 } 443 444 static int quota_getxstatev(struct super_block *sb, int type, void __user *addr) 445 { 446 struct fs_quota_statv fqs; 447 int ret; 448 449 if (!sb->s_qcop->get_state) 450 return -ENOSYS; 451 452 memset(&fqs, 0, sizeof(fqs)); 453 if (copy_from_user(&fqs, addr, 1)) /* Just read qs_version */ 454 return -EFAULT; 455 456 /* If this kernel doesn't support user specified version, fail */ 457 switch (fqs.qs_version) { 458 case FS_QSTATV_VERSION1: 459 break; 460 default: 461 return -EINVAL; 462 } 463 ret = quota_getstatev(sb, type, &fqs); 464 if (!ret && copy_to_user(addr, &fqs, sizeof(fqs))) 465 return -EFAULT; 466 return ret; 467 } 468 469 /* 470 * XFS defines BBTOB and BTOBB macros inside fs/xfs/ and we cannot move them 471 * out of there as xfsprogs rely on definitions being in that header file. So 472 * just define same functions here for quota purposes. 473 */ 474 #define XFS_BB_SHIFT 9 475 476 static inline u64 quota_bbtob(u64 blocks) 477 { 478 return blocks << XFS_BB_SHIFT; 479 } 480 481 static inline u64 quota_btobb(u64 bytes) 482 { 483 return (bytes + (1 << XFS_BB_SHIFT) - 1) >> XFS_BB_SHIFT; 484 } 485 486 static void copy_from_xfs_dqblk(struct qc_dqblk *dst, struct fs_disk_quota *src) 487 { 488 dst->d_spc_hardlimit = quota_bbtob(src->d_blk_hardlimit); 489 dst->d_spc_softlimit = quota_bbtob(src->d_blk_softlimit); 490 dst->d_ino_hardlimit = src->d_ino_hardlimit; 491 dst->d_ino_softlimit = src->d_ino_softlimit; 492 dst->d_space = quota_bbtob(src->d_bcount); 493 dst->d_ino_count = src->d_icount; 494 dst->d_ino_timer = src->d_itimer; 495 dst->d_spc_timer = src->d_btimer; 496 dst->d_ino_warns = src->d_iwarns; 497 dst->d_spc_warns = src->d_bwarns; 498 dst->d_rt_spc_hardlimit = quota_bbtob(src->d_rtb_hardlimit); 499 dst->d_rt_spc_softlimit = quota_bbtob(src->d_rtb_softlimit); 500 dst->d_rt_space = quota_bbtob(src->d_rtbcount); 501 dst->d_rt_spc_timer = src->d_rtbtimer; 502 dst->d_rt_spc_warns = src->d_rtbwarns; 503 dst->d_fieldmask = 0; 504 if (src->d_fieldmask & FS_DQ_ISOFT) 505 dst->d_fieldmask |= QC_INO_SOFT; 506 if (src->d_fieldmask & FS_DQ_IHARD) 507 dst->d_fieldmask |= QC_INO_HARD; 508 if (src->d_fieldmask & FS_DQ_BSOFT) 509 dst->d_fieldmask |= QC_SPC_SOFT; 510 if (src->d_fieldmask & FS_DQ_BHARD) 511 dst->d_fieldmask |= QC_SPC_HARD; 512 if (src->d_fieldmask & FS_DQ_RTBSOFT) 513 dst->d_fieldmask |= QC_RT_SPC_SOFT; 514 if (src->d_fieldmask & FS_DQ_RTBHARD) 515 dst->d_fieldmask |= QC_RT_SPC_HARD; 516 if (src->d_fieldmask & FS_DQ_BTIMER) 517 dst->d_fieldmask |= QC_SPC_TIMER; 518 if (src->d_fieldmask & FS_DQ_ITIMER) 519 dst->d_fieldmask |= QC_INO_TIMER; 520 if (src->d_fieldmask & FS_DQ_RTBTIMER) 521 dst->d_fieldmask |= QC_RT_SPC_TIMER; 522 if (src->d_fieldmask & FS_DQ_BWARNS) 523 dst->d_fieldmask |= QC_SPC_WARNS; 524 if (src->d_fieldmask & FS_DQ_IWARNS) 525 dst->d_fieldmask |= QC_INO_WARNS; 526 if (src->d_fieldmask & FS_DQ_RTBWARNS) 527 dst->d_fieldmask |= QC_RT_SPC_WARNS; 528 if (src->d_fieldmask & FS_DQ_BCOUNT) 529 dst->d_fieldmask |= QC_SPACE; 530 if (src->d_fieldmask & FS_DQ_ICOUNT) 531 dst->d_fieldmask |= QC_INO_COUNT; 532 if (src->d_fieldmask & FS_DQ_RTBCOUNT) 533 dst->d_fieldmask |= QC_RT_SPACE; 534 } 535 536 static void copy_qcinfo_from_xfs_dqblk(struct qc_info *dst, 537 struct fs_disk_quota *src) 538 { 539 memset(dst, 0, sizeof(*dst)); 540 dst->i_spc_timelimit = src->d_btimer; 541 dst->i_ino_timelimit = src->d_itimer; 542 dst->i_rt_spc_timelimit = src->d_rtbtimer; 543 dst->i_ino_warnlimit = src->d_iwarns; 544 dst->i_spc_warnlimit = src->d_bwarns; 545 dst->i_rt_spc_warnlimit = src->d_rtbwarns; 546 if (src->d_fieldmask & FS_DQ_BWARNS) 547 dst->i_fieldmask |= QC_SPC_WARNS; 548 if (src->d_fieldmask & FS_DQ_IWARNS) 549 dst->i_fieldmask |= QC_INO_WARNS; 550 if (src->d_fieldmask & FS_DQ_RTBWARNS) 551 dst->i_fieldmask |= QC_RT_SPC_WARNS; 552 if (src->d_fieldmask & FS_DQ_BTIMER) 553 dst->i_fieldmask |= QC_SPC_TIMER; 554 if (src->d_fieldmask & FS_DQ_ITIMER) 555 dst->i_fieldmask |= QC_INO_TIMER; 556 if (src->d_fieldmask & FS_DQ_RTBTIMER) 557 dst->i_fieldmask |= QC_RT_SPC_TIMER; 558 } 559 560 static int quota_setxquota(struct super_block *sb, int type, qid_t id, 561 void __user *addr) 562 { 563 struct fs_disk_quota fdq; 564 struct qc_dqblk qdq; 565 struct kqid qid; 566 567 if (copy_from_user(&fdq, addr, sizeof(fdq))) 568 return -EFAULT; 569 if (!sb->s_qcop->set_dqblk) 570 return -ENOSYS; 571 qid = make_kqid(current_user_ns(), type, id); 572 if (!qid_has_mapping(sb->s_user_ns, qid)) 573 return -EINVAL; 574 /* Are we actually setting timer / warning limits for all users? */ 575 if (from_kqid(sb->s_user_ns, qid) == 0 && 576 fdq.d_fieldmask & (FS_DQ_WARNS_MASK | FS_DQ_TIMER_MASK)) { 577 struct qc_info qinfo; 578 int ret; 579 580 if (!sb->s_qcop->set_info) 581 return -EINVAL; 582 copy_qcinfo_from_xfs_dqblk(&qinfo, &fdq); 583 ret = sb->s_qcop->set_info(sb, type, &qinfo); 584 if (ret) 585 return ret; 586 /* These are already done */ 587 fdq.d_fieldmask &= ~(FS_DQ_WARNS_MASK | FS_DQ_TIMER_MASK); 588 } 589 copy_from_xfs_dqblk(&qdq, &fdq); 590 return sb->s_qcop->set_dqblk(sb, qid, &qdq); 591 } 592 593 static void copy_to_xfs_dqblk(struct fs_disk_quota *dst, struct qc_dqblk *src, 594 int type, qid_t id) 595 { 596 memset(dst, 0, sizeof(*dst)); 597 dst->d_version = FS_DQUOT_VERSION; 598 dst->d_id = id; 599 if (type == USRQUOTA) 600 dst->d_flags = FS_USER_QUOTA; 601 else if (type == PRJQUOTA) 602 dst->d_flags = FS_PROJ_QUOTA; 603 else 604 dst->d_flags = FS_GROUP_QUOTA; 605 dst->d_blk_hardlimit = quota_btobb(src->d_spc_hardlimit); 606 dst->d_blk_softlimit = quota_btobb(src->d_spc_softlimit); 607 dst->d_ino_hardlimit = src->d_ino_hardlimit; 608 dst->d_ino_softlimit = src->d_ino_softlimit; 609 dst->d_bcount = quota_btobb(src->d_space); 610 dst->d_icount = src->d_ino_count; 611 dst->d_itimer = src->d_ino_timer; 612 dst->d_btimer = src->d_spc_timer; 613 dst->d_iwarns = src->d_ino_warns; 614 dst->d_bwarns = src->d_spc_warns; 615 dst->d_rtb_hardlimit = quota_btobb(src->d_rt_spc_hardlimit); 616 dst->d_rtb_softlimit = quota_btobb(src->d_rt_spc_softlimit); 617 dst->d_rtbcount = quota_btobb(src->d_rt_space); 618 dst->d_rtbtimer = src->d_rt_spc_timer; 619 dst->d_rtbwarns = src->d_rt_spc_warns; 620 } 621 622 static int quota_getxquota(struct super_block *sb, int type, qid_t id, 623 void __user *addr) 624 { 625 struct fs_disk_quota fdq; 626 struct qc_dqblk qdq; 627 struct kqid qid; 628 int ret; 629 630 if (!sb->s_qcop->get_dqblk) 631 return -ENOSYS; 632 qid = make_kqid(current_user_ns(), type, id); 633 if (!qid_has_mapping(sb->s_user_ns, qid)) 634 return -EINVAL; 635 ret = sb->s_qcop->get_dqblk(sb, qid, &qdq); 636 if (ret) 637 return ret; 638 copy_to_xfs_dqblk(&fdq, &qdq, type, id); 639 if (copy_to_user(addr, &fdq, sizeof(fdq))) 640 return -EFAULT; 641 return ret; 642 } 643 644 /* 645 * Return quota for next active quota >= this id, if any exists, 646 * otherwise return -ENOENT via ->get_nextdqblk. 647 */ 648 static int quota_getnextxquota(struct super_block *sb, int type, qid_t id, 649 void __user *addr) 650 { 651 struct fs_disk_quota fdq; 652 struct qc_dqblk qdq; 653 struct kqid qid; 654 qid_t id_out; 655 int ret; 656 657 if (!sb->s_qcop->get_nextdqblk) 658 return -ENOSYS; 659 qid = make_kqid(current_user_ns(), type, id); 660 if (!qid_has_mapping(sb->s_user_ns, qid)) 661 return -EINVAL; 662 ret = sb->s_qcop->get_nextdqblk(sb, &qid, &qdq); 663 if (ret) 664 return ret; 665 id_out = from_kqid(current_user_ns(), qid); 666 copy_to_xfs_dqblk(&fdq, &qdq, type, id_out); 667 if (copy_to_user(addr, &fdq, sizeof(fdq))) 668 return -EFAULT; 669 return ret; 670 } 671 672 static int quota_rmxquota(struct super_block *sb, void __user *addr) 673 { 674 __u32 flags; 675 676 if (copy_from_user(&flags, addr, sizeof(flags))) 677 return -EFAULT; 678 if (!sb->s_qcop->rm_xquota) 679 return -ENOSYS; 680 return sb->s_qcop->rm_xquota(sb, flags); 681 } 682 683 /* Copy parameters and call proper function */ 684 static int do_quotactl(struct super_block *sb, int type, int cmd, qid_t id, 685 void __user *addr, const struct path *path) 686 { 687 int ret; 688 689 if (type >= MAXQUOTAS) 690 return -EINVAL; 691 type = array_index_nospec(type, MAXQUOTAS); 692 /* 693 * Quota not supported on this fs? Check this before s_quota_types 694 * since they needn't be set if quota is not supported at all. 695 */ 696 if (!sb->s_qcop) 697 return -ENOSYS; 698 if (!(sb->s_quota_types & (1 << type))) 699 return -EINVAL; 700 701 ret = check_quotactl_permission(sb, type, cmd, id); 702 if (ret < 0) 703 return ret; 704 705 switch (cmd) { 706 case Q_QUOTAON: 707 return quota_quotaon(sb, type, id, path); 708 case Q_QUOTAOFF: 709 return quota_quotaoff(sb, type); 710 case Q_GETFMT: 711 return quota_getfmt(sb, type, addr); 712 case Q_GETINFO: 713 return quota_getinfo(sb, type, addr); 714 case Q_SETINFO: 715 return quota_setinfo(sb, type, addr); 716 case Q_GETQUOTA: 717 return quota_getquota(sb, type, id, addr); 718 case Q_GETNEXTQUOTA: 719 return quota_getnextquota(sb, type, id, addr); 720 case Q_SETQUOTA: 721 return quota_setquota(sb, type, id, addr); 722 case Q_SYNC: 723 if (!sb->s_qcop->quota_sync) 724 return -ENOSYS; 725 return sb->s_qcop->quota_sync(sb, type); 726 case Q_XQUOTAON: 727 return quota_enable(sb, addr); 728 case Q_XQUOTAOFF: 729 return quota_disable(sb, addr); 730 case Q_XQUOTARM: 731 return quota_rmxquota(sb, addr); 732 case Q_XGETQSTAT: 733 return quota_getxstate(sb, type, addr); 734 case Q_XGETQSTATV: 735 return quota_getxstatev(sb, type, addr); 736 case Q_XSETQLIM: 737 return quota_setxquota(sb, type, id, addr); 738 case Q_XGETQUOTA: 739 return quota_getxquota(sb, type, id, addr); 740 case Q_XGETNEXTQUOTA: 741 return quota_getnextxquota(sb, type, id, addr); 742 case Q_XQUOTASYNC: 743 if (sb_rdonly(sb)) 744 return -EROFS; 745 /* XFS quotas are fully coherent now, making this call a noop */ 746 return 0; 747 default: 748 return -EINVAL; 749 } 750 } 751 752 #ifdef CONFIG_BLOCK 753 754 /* Return 1 if 'cmd' will block on frozen filesystem */ 755 static int quotactl_cmd_write(int cmd) 756 { 757 /* 758 * We cannot allow Q_GETQUOTA and Q_GETNEXTQUOTA without write access 759 * as dquot_acquire() may allocate space for new structure and OCFS2 760 * needs to increment on-disk use count. 761 */ 762 switch (cmd) { 763 case Q_GETFMT: 764 case Q_GETINFO: 765 case Q_SYNC: 766 case Q_XGETQSTAT: 767 case Q_XGETQSTATV: 768 case Q_XGETQUOTA: 769 case Q_XGETNEXTQUOTA: 770 case Q_XQUOTASYNC: 771 return 0; 772 } 773 return 1; 774 } 775 #endif /* CONFIG_BLOCK */ 776 777 /* Return true if quotactl command is manipulating quota on/off state */ 778 static bool quotactl_cmd_onoff(int cmd) 779 { 780 return (cmd == Q_QUOTAON) || (cmd == Q_QUOTAOFF) || 781 (cmd == Q_XQUOTAON) || (cmd == Q_XQUOTAOFF); 782 } 783 784 /* 785 * look up a superblock on which quota ops will be performed 786 * - use the name of a block device to find the superblock thereon 787 */ 788 static struct super_block *quotactl_block(const char __user *special, int cmd) 789 { 790 #ifdef CONFIG_BLOCK 791 struct block_device *bdev; 792 struct super_block *sb; 793 struct filename *tmp = getname(special); 794 795 if (IS_ERR(tmp)) 796 return ERR_CAST(tmp); 797 bdev = lookup_bdev(tmp->name); 798 putname(tmp); 799 if (IS_ERR(bdev)) 800 return ERR_CAST(bdev); 801 if (quotactl_cmd_onoff(cmd)) 802 sb = get_super_exclusive_thawed(bdev); 803 else if (quotactl_cmd_write(cmd)) 804 sb = get_super_thawed(bdev); 805 else 806 sb = get_super(bdev); 807 bdput(bdev); 808 if (!sb) 809 return ERR_PTR(-ENODEV); 810 811 return sb; 812 #else 813 return ERR_PTR(-ENODEV); 814 #endif 815 } 816 817 /* 818 * This is the system call interface. This communicates with 819 * the user-level programs. Currently this only supports diskquota 820 * calls. Maybe we need to add the process quotas etc. in the future, 821 * but we probably should use rlimits for that. 822 */ 823 int kernel_quotactl(unsigned int cmd, const char __user *special, 824 qid_t id, void __user *addr) 825 { 826 uint cmds, type; 827 struct super_block *sb = NULL; 828 struct path path, *pathp = NULL; 829 int ret; 830 831 cmds = cmd >> SUBCMDSHIFT; 832 type = cmd & SUBCMDMASK; 833 834 /* 835 * As a special case Q_SYNC can be called without a specific device. 836 * It will iterate all superblocks that have quota enabled and call 837 * the sync action on each of them. 838 */ 839 if (!special) { 840 if (cmds == Q_SYNC) 841 return quota_sync_all(type); 842 return -ENODEV; 843 } 844 845 /* 846 * Path for quotaon has to be resolved before grabbing superblock 847 * because that gets s_umount sem which is also possibly needed by path 848 * resolution (think about autofs) and thus deadlocks could arise. 849 */ 850 if (cmds == Q_QUOTAON) { 851 ret = user_path_at(AT_FDCWD, addr, LOOKUP_FOLLOW|LOOKUP_AUTOMOUNT, &path); 852 if (ret) 853 pathp = ERR_PTR(ret); 854 else 855 pathp = &path; 856 } 857 858 sb = quotactl_block(special, cmds); 859 if (IS_ERR(sb)) { 860 ret = PTR_ERR(sb); 861 goto out; 862 } 863 864 ret = do_quotactl(sb, type, cmds, id, addr, pathp); 865 866 if (!quotactl_cmd_onoff(cmds)) 867 drop_super(sb); 868 else 869 drop_super_exclusive(sb); 870 out: 871 if (pathp && !IS_ERR(pathp)) 872 path_put(pathp); 873 return ret; 874 } 875 876 SYSCALL_DEFINE4(quotactl, unsigned int, cmd, const char __user *, special, 877 qid_t, id, void __user *, addr) 878 { 879 return kernel_quotactl(cmd, special, id, addr); 880 } 881