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 #include "compat.h" 23 24 static int check_quotactl_permission(struct super_block *sb, int type, int cmd, 25 qid_t id) 26 { 27 switch (cmd) { 28 /* these commands do not require any special privilegues */ 29 case Q_GETFMT: 30 case Q_SYNC: 31 case Q_GETINFO: 32 case Q_XGETQSTAT: 33 case Q_XGETQSTATV: 34 case Q_XQUOTASYNC: 35 break; 36 /* allow to query information for dquots we "own" */ 37 case Q_GETQUOTA: 38 case Q_XGETQUOTA: 39 if ((type == USRQUOTA && uid_eq(current_euid(), make_kuid(current_user_ns(), id))) || 40 (type == GRPQUOTA && in_egroup_p(make_kgid(current_user_ns(), id)))) 41 break; 42 fallthrough; 43 default: 44 if (!capable(CAP_SYS_ADMIN)) 45 return -EPERM; 46 } 47 48 return security_quotactl(cmd, type, id, sb); 49 } 50 51 static void quota_sync_one(struct super_block *sb, void *arg) 52 { 53 int type = *(int *)arg; 54 55 if (sb->s_qcop && sb->s_qcop->quota_sync && 56 (sb->s_quota_types & (1 << type))) 57 sb->s_qcop->quota_sync(sb, type); 58 } 59 60 static int quota_sync_all(int type) 61 { 62 int ret; 63 64 ret = security_quotactl(Q_SYNC, type, 0, NULL); 65 if (!ret) 66 iterate_supers(quota_sync_one, &type); 67 return ret; 68 } 69 70 unsigned int qtype_enforce_flag(int type) 71 { 72 switch (type) { 73 case USRQUOTA: 74 return FS_QUOTA_UDQ_ENFD; 75 case GRPQUOTA: 76 return FS_QUOTA_GDQ_ENFD; 77 case PRJQUOTA: 78 return FS_QUOTA_PDQ_ENFD; 79 } 80 return 0; 81 } 82 83 static int quota_quotaon(struct super_block *sb, int type, qid_t id, 84 const struct path *path) 85 { 86 if (!sb->s_qcop->quota_on && !sb->s_qcop->quota_enable) 87 return -ENOSYS; 88 if (sb->s_qcop->quota_enable) 89 return sb->s_qcop->quota_enable(sb, qtype_enforce_flag(type)); 90 if (IS_ERR(path)) 91 return PTR_ERR(path); 92 return sb->s_qcop->quota_on(sb, type, id, path); 93 } 94 95 static int quota_quotaoff(struct super_block *sb, int type) 96 { 97 if (!sb->s_qcop->quota_off && !sb->s_qcop->quota_disable) 98 return -ENOSYS; 99 if (sb->s_qcop->quota_disable) 100 return sb->s_qcop->quota_disable(sb, qtype_enforce_flag(type)); 101 return sb->s_qcop->quota_off(sb, type); 102 } 103 104 static int quota_getfmt(struct super_block *sb, int type, void __user *addr) 105 { 106 __u32 fmt; 107 108 if (!sb_has_quota_active(sb, type)) 109 return -ESRCH; 110 fmt = sb_dqopt(sb)->info[type].dqi_format->qf_fmt_id; 111 if (copy_to_user(addr, &fmt, sizeof(fmt))) 112 return -EFAULT; 113 return 0; 114 } 115 116 static int quota_getinfo(struct super_block *sb, int type, void __user *addr) 117 { 118 struct qc_state state; 119 struct qc_type_state *tstate; 120 struct if_dqinfo uinfo; 121 int ret; 122 123 if (!sb->s_qcop->get_state) 124 return -ENOSYS; 125 ret = sb->s_qcop->get_state(sb, &state); 126 if (ret) 127 return ret; 128 tstate = state.s_state + type; 129 if (!(tstate->flags & QCI_ACCT_ENABLED)) 130 return -ESRCH; 131 memset(&uinfo, 0, sizeof(uinfo)); 132 uinfo.dqi_bgrace = tstate->spc_timelimit; 133 uinfo.dqi_igrace = tstate->ino_timelimit; 134 if (tstate->flags & QCI_SYSFILE) 135 uinfo.dqi_flags |= DQF_SYS_FILE; 136 if (tstate->flags & QCI_ROOT_SQUASH) 137 uinfo.dqi_flags |= DQF_ROOT_SQUASH; 138 uinfo.dqi_valid = IIF_ALL; 139 if (copy_to_user(addr, &uinfo, sizeof(uinfo))) 140 return -EFAULT; 141 return 0; 142 } 143 144 static int quota_setinfo(struct super_block *sb, int type, void __user *addr) 145 { 146 struct if_dqinfo info; 147 struct qc_info qinfo; 148 149 if (copy_from_user(&info, addr, sizeof(info))) 150 return -EFAULT; 151 if (!sb->s_qcop->set_info) 152 return -ENOSYS; 153 if (info.dqi_valid & ~(IIF_FLAGS | IIF_BGRACE | IIF_IGRACE)) 154 return -EINVAL; 155 memset(&qinfo, 0, sizeof(qinfo)); 156 if (info.dqi_valid & IIF_FLAGS) { 157 if (info.dqi_flags & ~DQF_SETINFO_MASK) 158 return -EINVAL; 159 if (info.dqi_flags & DQF_ROOT_SQUASH) 160 qinfo.i_flags |= QCI_ROOT_SQUASH; 161 qinfo.i_fieldmask |= QC_FLAGS; 162 } 163 if (info.dqi_valid & IIF_BGRACE) { 164 qinfo.i_spc_timelimit = info.dqi_bgrace; 165 qinfo.i_fieldmask |= QC_SPC_TIMER; 166 } 167 if (info.dqi_valid & IIF_IGRACE) { 168 qinfo.i_ino_timelimit = info.dqi_igrace; 169 qinfo.i_fieldmask |= QC_INO_TIMER; 170 } 171 return sb->s_qcop->set_info(sb, type, &qinfo); 172 } 173 174 static inline qsize_t qbtos(qsize_t blocks) 175 { 176 return blocks << QIF_DQBLKSIZE_BITS; 177 } 178 179 static inline qsize_t stoqb(qsize_t space) 180 { 181 return (space + QIF_DQBLKSIZE - 1) >> QIF_DQBLKSIZE_BITS; 182 } 183 184 static void copy_to_if_dqblk(struct if_dqblk *dst, struct qc_dqblk *src) 185 { 186 memset(dst, 0, sizeof(*dst)); 187 dst->dqb_bhardlimit = stoqb(src->d_spc_hardlimit); 188 dst->dqb_bsoftlimit = stoqb(src->d_spc_softlimit); 189 dst->dqb_curspace = src->d_space; 190 dst->dqb_ihardlimit = src->d_ino_hardlimit; 191 dst->dqb_isoftlimit = src->d_ino_softlimit; 192 dst->dqb_curinodes = src->d_ino_count; 193 dst->dqb_btime = src->d_spc_timer; 194 dst->dqb_itime = src->d_ino_timer; 195 dst->dqb_valid = QIF_ALL; 196 } 197 198 static int quota_getquota(struct super_block *sb, int type, qid_t id, 199 void __user *addr) 200 { 201 struct kqid qid; 202 struct qc_dqblk fdq; 203 struct if_dqblk idq; 204 int ret; 205 206 if (!sb->s_qcop->get_dqblk) 207 return -ENOSYS; 208 qid = make_kqid(current_user_ns(), type, id); 209 if (!qid_has_mapping(sb->s_user_ns, qid)) 210 return -EINVAL; 211 ret = sb->s_qcop->get_dqblk(sb, qid, &fdq); 212 if (ret) 213 return ret; 214 copy_to_if_dqblk(&idq, &fdq); 215 216 if (compat_need_64bit_alignment_fixup()) { 217 struct compat_if_dqblk __user *compat_dqblk = addr; 218 219 if (copy_to_user(compat_dqblk, &idq, sizeof(*compat_dqblk))) 220 return -EFAULT; 221 if (put_user(idq.dqb_valid, &compat_dqblk->dqb_valid)) 222 return -EFAULT; 223 } else { 224 if (copy_to_user(addr, &idq, sizeof(idq))) 225 return -EFAULT; 226 } 227 return 0; 228 } 229 230 /* 231 * Return quota for next active quota >= this id, if any exists, 232 * otherwise return -ENOENT via ->get_nextdqblk 233 */ 234 static int quota_getnextquota(struct super_block *sb, int type, qid_t id, 235 void __user *addr) 236 { 237 struct kqid qid; 238 struct qc_dqblk fdq; 239 struct if_nextdqblk idq; 240 int ret; 241 242 if (!sb->s_qcop->get_nextdqblk) 243 return -ENOSYS; 244 qid = make_kqid(current_user_ns(), type, id); 245 if (!qid_has_mapping(sb->s_user_ns, qid)) 246 return -EINVAL; 247 ret = sb->s_qcop->get_nextdqblk(sb, &qid, &fdq); 248 if (ret) 249 return ret; 250 /* struct if_nextdqblk is a superset of struct if_dqblk */ 251 copy_to_if_dqblk((struct if_dqblk *)&idq, &fdq); 252 idq.dqb_id = from_kqid(current_user_ns(), qid); 253 if (copy_to_user(addr, &idq, sizeof(idq))) 254 return -EFAULT; 255 return 0; 256 } 257 258 static void copy_from_if_dqblk(struct qc_dqblk *dst, struct if_dqblk *src) 259 { 260 dst->d_spc_hardlimit = qbtos(src->dqb_bhardlimit); 261 dst->d_spc_softlimit = qbtos(src->dqb_bsoftlimit); 262 dst->d_space = src->dqb_curspace; 263 dst->d_ino_hardlimit = src->dqb_ihardlimit; 264 dst->d_ino_softlimit = src->dqb_isoftlimit; 265 dst->d_ino_count = src->dqb_curinodes; 266 dst->d_spc_timer = src->dqb_btime; 267 dst->d_ino_timer = src->dqb_itime; 268 269 dst->d_fieldmask = 0; 270 if (src->dqb_valid & QIF_BLIMITS) 271 dst->d_fieldmask |= QC_SPC_SOFT | QC_SPC_HARD; 272 if (src->dqb_valid & QIF_SPACE) 273 dst->d_fieldmask |= QC_SPACE; 274 if (src->dqb_valid & QIF_ILIMITS) 275 dst->d_fieldmask |= QC_INO_SOFT | QC_INO_HARD; 276 if (src->dqb_valid & QIF_INODES) 277 dst->d_fieldmask |= QC_INO_COUNT; 278 if (src->dqb_valid & QIF_BTIME) 279 dst->d_fieldmask |= QC_SPC_TIMER; 280 if (src->dqb_valid & QIF_ITIME) 281 dst->d_fieldmask |= QC_INO_TIMER; 282 } 283 284 static int quota_setquota(struct super_block *sb, int type, qid_t id, 285 void __user *addr) 286 { 287 struct qc_dqblk fdq; 288 struct if_dqblk idq; 289 struct kqid qid; 290 291 if (compat_need_64bit_alignment_fixup()) { 292 struct compat_if_dqblk __user *compat_dqblk = addr; 293 294 if (copy_from_user(&idq, compat_dqblk, sizeof(*compat_dqblk)) || 295 get_user(idq.dqb_valid, &compat_dqblk->dqb_valid)) 296 return -EFAULT; 297 } else { 298 if (copy_from_user(&idq, addr, sizeof(idq))) 299 return -EFAULT; 300 } 301 if (!sb->s_qcop->set_dqblk) 302 return -ENOSYS; 303 qid = make_kqid(current_user_ns(), type, id); 304 if (!qid_has_mapping(sb->s_user_ns, qid)) 305 return -EINVAL; 306 copy_from_if_dqblk(&fdq, &idq); 307 return sb->s_qcop->set_dqblk(sb, qid, &fdq); 308 } 309 310 static int quota_enable(struct super_block *sb, void __user *addr) 311 { 312 __u32 flags; 313 314 if (copy_from_user(&flags, addr, sizeof(flags))) 315 return -EFAULT; 316 if (!sb->s_qcop->quota_enable) 317 return -ENOSYS; 318 return sb->s_qcop->quota_enable(sb, flags); 319 } 320 321 static int quota_disable(struct super_block *sb, void __user *addr) 322 { 323 __u32 flags; 324 325 if (copy_from_user(&flags, addr, sizeof(flags))) 326 return -EFAULT; 327 if (!sb->s_qcop->quota_disable) 328 return -ENOSYS; 329 return sb->s_qcop->quota_disable(sb, flags); 330 } 331 332 static int quota_state_to_flags(struct qc_state *state) 333 { 334 int flags = 0; 335 336 if (state->s_state[USRQUOTA].flags & QCI_ACCT_ENABLED) 337 flags |= FS_QUOTA_UDQ_ACCT; 338 if (state->s_state[USRQUOTA].flags & QCI_LIMITS_ENFORCED) 339 flags |= FS_QUOTA_UDQ_ENFD; 340 if (state->s_state[GRPQUOTA].flags & QCI_ACCT_ENABLED) 341 flags |= FS_QUOTA_GDQ_ACCT; 342 if (state->s_state[GRPQUOTA].flags & QCI_LIMITS_ENFORCED) 343 flags |= FS_QUOTA_GDQ_ENFD; 344 if (state->s_state[PRJQUOTA].flags & QCI_ACCT_ENABLED) 345 flags |= FS_QUOTA_PDQ_ACCT; 346 if (state->s_state[PRJQUOTA].flags & QCI_LIMITS_ENFORCED) 347 flags |= FS_QUOTA_PDQ_ENFD; 348 return flags; 349 } 350 351 static int quota_getstate(struct super_block *sb, int type, 352 struct fs_quota_stat *fqs) 353 { 354 struct qc_state state; 355 int ret; 356 357 memset(&state, 0, sizeof (struct qc_state)); 358 ret = sb->s_qcop->get_state(sb, &state); 359 if (ret < 0) 360 return ret; 361 362 memset(fqs, 0, sizeof(*fqs)); 363 fqs->qs_version = FS_QSTAT_VERSION; 364 fqs->qs_flags = quota_state_to_flags(&state); 365 /* No quota enabled? */ 366 if (!fqs->qs_flags) 367 return -ENOSYS; 368 fqs->qs_incoredqs = state.s_incoredqs; 369 370 fqs->qs_btimelimit = state.s_state[type].spc_timelimit; 371 fqs->qs_itimelimit = state.s_state[type].ino_timelimit; 372 fqs->qs_rtbtimelimit = state.s_state[type].rt_spc_timelimit; 373 fqs->qs_bwarnlimit = state.s_state[type].spc_warnlimit; 374 fqs->qs_iwarnlimit = state.s_state[type].ino_warnlimit; 375 376 /* Inodes may be allocated even if inactive; copy out if present */ 377 if (state.s_state[USRQUOTA].ino) { 378 fqs->qs_uquota.qfs_ino = state.s_state[USRQUOTA].ino; 379 fqs->qs_uquota.qfs_nblks = state.s_state[USRQUOTA].blocks; 380 fqs->qs_uquota.qfs_nextents = state.s_state[USRQUOTA].nextents; 381 } 382 if (state.s_state[GRPQUOTA].ino) { 383 fqs->qs_gquota.qfs_ino = state.s_state[GRPQUOTA].ino; 384 fqs->qs_gquota.qfs_nblks = state.s_state[GRPQUOTA].blocks; 385 fqs->qs_gquota.qfs_nextents = state.s_state[GRPQUOTA].nextents; 386 } 387 if (state.s_state[PRJQUOTA].ino) { 388 /* 389 * Q_XGETQSTAT doesn't have room for both group and project 390 * quotas. So, allow the project quota values to be copied out 391 * only if there is no group quota information available. 392 */ 393 if (!(state.s_state[GRPQUOTA].flags & QCI_ACCT_ENABLED)) { 394 fqs->qs_gquota.qfs_ino = state.s_state[PRJQUOTA].ino; 395 fqs->qs_gquota.qfs_nblks = 396 state.s_state[PRJQUOTA].blocks; 397 fqs->qs_gquota.qfs_nextents = 398 state.s_state[PRJQUOTA].nextents; 399 } 400 } 401 return 0; 402 } 403 404 static int compat_copy_fs_qfilestat(struct compat_fs_qfilestat __user *to, 405 struct fs_qfilestat *from) 406 { 407 if (copy_to_user(to, from, sizeof(*to)) || 408 put_user(from->qfs_nextents, &to->qfs_nextents)) 409 return -EFAULT; 410 return 0; 411 } 412 413 static int compat_copy_fs_quota_stat(struct compat_fs_quota_stat __user *to, 414 struct fs_quota_stat *from) 415 { 416 if (put_user(from->qs_version, &to->qs_version) || 417 put_user(from->qs_flags, &to->qs_flags) || 418 put_user(from->qs_pad, &to->qs_pad) || 419 compat_copy_fs_qfilestat(&to->qs_uquota, &from->qs_uquota) || 420 compat_copy_fs_qfilestat(&to->qs_gquota, &from->qs_gquota) || 421 put_user(from->qs_incoredqs, &to->qs_incoredqs) || 422 put_user(from->qs_btimelimit, &to->qs_btimelimit) || 423 put_user(from->qs_itimelimit, &to->qs_itimelimit) || 424 put_user(from->qs_rtbtimelimit, &to->qs_rtbtimelimit) || 425 put_user(from->qs_bwarnlimit, &to->qs_bwarnlimit) || 426 put_user(from->qs_iwarnlimit, &to->qs_iwarnlimit)) 427 return -EFAULT; 428 return 0; 429 } 430 431 static int quota_getxstate(struct super_block *sb, int type, void __user *addr) 432 { 433 struct fs_quota_stat fqs; 434 int ret; 435 436 if (!sb->s_qcop->get_state) 437 return -ENOSYS; 438 ret = quota_getstate(sb, type, &fqs); 439 if (ret) 440 return ret; 441 442 if (compat_need_64bit_alignment_fixup()) 443 return compat_copy_fs_quota_stat(addr, &fqs); 444 if (copy_to_user(addr, &fqs, sizeof(fqs))) 445 return -EFAULT; 446 return 0; 447 } 448 449 static int quota_getstatev(struct super_block *sb, int type, 450 struct fs_quota_statv *fqs) 451 { 452 struct qc_state state; 453 int ret; 454 455 memset(&state, 0, sizeof (struct qc_state)); 456 ret = sb->s_qcop->get_state(sb, &state); 457 if (ret < 0) 458 return ret; 459 460 memset(fqs, 0, sizeof(*fqs)); 461 fqs->qs_version = FS_QSTAT_VERSION; 462 fqs->qs_flags = quota_state_to_flags(&state); 463 /* No quota enabled? */ 464 if (!fqs->qs_flags) 465 return -ENOSYS; 466 fqs->qs_incoredqs = state.s_incoredqs; 467 468 fqs->qs_btimelimit = state.s_state[type].spc_timelimit; 469 fqs->qs_itimelimit = state.s_state[type].ino_timelimit; 470 fqs->qs_rtbtimelimit = state.s_state[type].rt_spc_timelimit; 471 fqs->qs_bwarnlimit = state.s_state[type].spc_warnlimit; 472 fqs->qs_iwarnlimit = state.s_state[type].ino_warnlimit; 473 474 /* Inodes may be allocated even if inactive; copy out if present */ 475 if (state.s_state[USRQUOTA].ino) { 476 fqs->qs_uquota.qfs_ino = state.s_state[USRQUOTA].ino; 477 fqs->qs_uquota.qfs_nblks = state.s_state[USRQUOTA].blocks; 478 fqs->qs_uquota.qfs_nextents = state.s_state[USRQUOTA].nextents; 479 } 480 if (state.s_state[GRPQUOTA].ino) { 481 fqs->qs_gquota.qfs_ino = state.s_state[GRPQUOTA].ino; 482 fqs->qs_gquota.qfs_nblks = state.s_state[GRPQUOTA].blocks; 483 fqs->qs_gquota.qfs_nextents = state.s_state[GRPQUOTA].nextents; 484 } 485 if (state.s_state[PRJQUOTA].ino) { 486 fqs->qs_pquota.qfs_ino = state.s_state[PRJQUOTA].ino; 487 fqs->qs_pquota.qfs_nblks = state.s_state[PRJQUOTA].blocks; 488 fqs->qs_pquota.qfs_nextents = state.s_state[PRJQUOTA].nextents; 489 } 490 return 0; 491 } 492 493 static int quota_getxstatev(struct super_block *sb, int type, void __user *addr) 494 { 495 struct fs_quota_statv fqs; 496 int ret; 497 498 if (!sb->s_qcop->get_state) 499 return -ENOSYS; 500 501 memset(&fqs, 0, sizeof(fqs)); 502 if (copy_from_user(&fqs, addr, 1)) /* Just read qs_version */ 503 return -EFAULT; 504 505 /* If this kernel doesn't support user specified version, fail */ 506 switch (fqs.qs_version) { 507 case FS_QSTATV_VERSION1: 508 break; 509 default: 510 return -EINVAL; 511 } 512 ret = quota_getstatev(sb, type, &fqs); 513 if (!ret && copy_to_user(addr, &fqs, sizeof(fqs))) 514 return -EFAULT; 515 return ret; 516 } 517 518 /* 519 * XFS defines BBTOB and BTOBB macros inside fs/xfs/ and we cannot move them 520 * out of there as xfsprogs rely on definitions being in that header file. So 521 * just define same functions here for quota purposes. 522 */ 523 #define XFS_BB_SHIFT 9 524 525 static inline u64 quota_bbtob(u64 blocks) 526 { 527 return blocks << XFS_BB_SHIFT; 528 } 529 530 static inline u64 quota_btobb(u64 bytes) 531 { 532 return (bytes + (1 << XFS_BB_SHIFT) - 1) >> XFS_BB_SHIFT; 533 } 534 535 static inline s64 copy_from_xfs_dqblk_ts(const struct fs_disk_quota *d, 536 __s32 timer, __s8 timer_hi) 537 { 538 if (d->d_fieldmask & FS_DQ_BIGTIME) 539 return (u32)timer | (s64)timer_hi << 32; 540 return timer; 541 } 542 543 static void copy_from_xfs_dqblk(struct qc_dqblk *dst, struct fs_disk_quota *src) 544 { 545 dst->d_spc_hardlimit = quota_bbtob(src->d_blk_hardlimit); 546 dst->d_spc_softlimit = quota_bbtob(src->d_blk_softlimit); 547 dst->d_ino_hardlimit = src->d_ino_hardlimit; 548 dst->d_ino_softlimit = src->d_ino_softlimit; 549 dst->d_space = quota_bbtob(src->d_bcount); 550 dst->d_ino_count = src->d_icount; 551 dst->d_ino_timer = copy_from_xfs_dqblk_ts(src, src->d_itimer, 552 src->d_itimer_hi); 553 dst->d_spc_timer = copy_from_xfs_dqblk_ts(src, src->d_btimer, 554 src->d_btimer_hi); 555 dst->d_ino_warns = src->d_iwarns; 556 dst->d_spc_warns = src->d_bwarns; 557 dst->d_rt_spc_hardlimit = quota_bbtob(src->d_rtb_hardlimit); 558 dst->d_rt_spc_softlimit = quota_bbtob(src->d_rtb_softlimit); 559 dst->d_rt_space = quota_bbtob(src->d_rtbcount); 560 dst->d_rt_spc_timer = copy_from_xfs_dqblk_ts(src, src->d_rtbtimer, 561 src->d_rtbtimer_hi); 562 dst->d_rt_spc_warns = src->d_rtbwarns; 563 dst->d_fieldmask = 0; 564 if (src->d_fieldmask & FS_DQ_ISOFT) 565 dst->d_fieldmask |= QC_INO_SOFT; 566 if (src->d_fieldmask & FS_DQ_IHARD) 567 dst->d_fieldmask |= QC_INO_HARD; 568 if (src->d_fieldmask & FS_DQ_BSOFT) 569 dst->d_fieldmask |= QC_SPC_SOFT; 570 if (src->d_fieldmask & FS_DQ_BHARD) 571 dst->d_fieldmask |= QC_SPC_HARD; 572 if (src->d_fieldmask & FS_DQ_RTBSOFT) 573 dst->d_fieldmask |= QC_RT_SPC_SOFT; 574 if (src->d_fieldmask & FS_DQ_RTBHARD) 575 dst->d_fieldmask |= QC_RT_SPC_HARD; 576 if (src->d_fieldmask & FS_DQ_BTIMER) 577 dst->d_fieldmask |= QC_SPC_TIMER; 578 if (src->d_fieldmask & FS_DQ_ITIMER) 579 dst->d_fieldmask |= QC_INO_TIMER; 580 if (src->d_fieldmask & FS_DQ_RTBTIMER) 581 dst->d_fieldmask |= QC_RT_SPC_TIMER; 582 if (src->d_fieldmask & FS_DQ_BWARNS) 583 dst->d_fieldmask |= QC_SPC_WARNS; 584 if (src->d_fieldmask & FS_DQ_IWARNS) 585 dst->d_fieldmask |= QC_INO_WARNS; 586 if (src->d_fieldmask & FS_DQ_RTBWARNS) 587 dst->d_fieldmask |= QC_RT_SPC_WARNS; 588 if (src->d_fieldmask & FS_DQ_BCOUNT) 589 dst->d_fieldmask |= QC_SPACE; 590 if (src->d_fieldmask & FS_DQ_ICOUNT) 591 dst->d_fieldmask |= QC_INO_COUNT; 592 if (src->d_fieldmask & FS_DQ_RTBCOUNT) 593 dst->d_fieldmask |= QC_RT_SPACE; 594 } 595 596 static void copy_qcinfo_from_xfs_dqblk(struct qc_info *dst, 597 struct fs_disk_quota *src) 598 { 599 memset(dst, 0, sizeof(*dst)); 600 dst->i_spc_timelimit = src->d_btimer; 601 dst->i_ino_timelimit = src->d_itimer; 602 dst->i_rt_spc_timelimit = src->d_rtbtimer; 603 dst->i_ino_warnlimit = src->d_iwarns; 604 dst->i_spc_warnlimit = src->d_bwarns; 605 dst->i_rt_spc_warnlimit = src->d_rtbwarns; 606 if (src->d_fieldmask & FS_DQ_BWARNS) 607 dst->i_fieldmask |= QC_SPC_WARNS; 608 if (src->d_fieldmask & FS_DQ_IWARNS) 609 dst->i_fieldmask |= QC_INO_WARNS; 610 if (src->d_fieldmask & FS_DQ_RTBWARNS) 611 dst->i_fieldmask |= QC_RT_SPC_WARNS; 612 if (src->d_fieldmask & FS_DQ_BTIMER) 613 dst->i_fieldmask |= QC_SPC_TIMER; 614 if (src->d_fieldmask & FS_DQ_ITIMER) 615 dst->i_fieldmask |= QC_INO_TIMER; 616 if (src->d_fieldmask & FS_DQ_RTBTIMER) 617 dst->i_fieldmask |= QC_RT_SPC_TIMER; 618 } 619 620 static int quota_setxquota(struct super_block *sb, int type, qid_t id, 621 void __user *addr) 622 { 623 struct fs_disk_quota fdq; 624 struct qc_dqblk qdq; 625 struct kqid qid; 626 627 if (copy_from_user(&fdq, addr, sizeof(fdq))) 628 return -EFAULT; 629 if (!sb->s_qcop->set_dqblk) 630 return -ENOSYS; 631 qid = make_kqid(current_user_ns(), type, id); 632 if (!qid_has_mapping(sb->s_user_ns, qid)) 633 return -EINVAL; 634 /* Are we actually setting timer / warning limits for all users? */ 635 if (from_kqid(sb->s_user_ns, qid) == 0 && 636 fdq.d_fieldmask & (FS_DQ_WARNS_MASK | FS_DQ_TIMER_MASK)) { 637 struct qc_info qinfo; 638 int ret; 639 640 if (!sb->s_qcop->set_info) 641 return -EINVAL; 642 copy_qcinfo_from_xfs_dqblk(&qinfo, &fdq); 643 ret = sb->s_qcop->set_info(sb, type, &qinfo); 644 if (ret) 645 return ret; 646 /* These are already done */ 647 fdq.d_fieldmask &= ~(FS_DQ_WARNS_MASK | FS_DQ_TIMER_MASK); 648 } 649 copy_from_xfs_dqblk(&qdq, &fdq); 650 return sb->s_qcop->set_dqblk(sb, qid, &qdq); 651 } 652 653 static inline void copy_to_xfs_dqblk_ts(const struct fs_disk_quota *d, 654 __s32 *timer_lo, __s8 *timer_hi, s64 timer) 655 { 656 *timer_lo = timer; 657 if (d->d_fieldmask & FS_DQ_BIGTIME) 658 *timer_hi = timer >> 32; 659 } 660 661 static inline bool want_bigtime(s64 timer) 662 { 663 return timer > S32_MAX || timer < S32_MIN; 664 } 665 666 static void copy_to_xfs_dqblk(struct fs_disk_quota *dst, struct qc_dqblk *src, 667 int type, qid_t id) 668 { 669 memset(dst, 0, sizeof(*dst)); 670 if (want_bigtime(src->d_ino_timer) || want_bigtime(src->d_spc_timer) || 671 want_bigtime(src->d_rt_spc_timer)) 672 dst->d_fieldmask |= FS_DQ_BIGTIME; 673 dst->d_version = FS_DQUOT_VERSION; 674 dst->d_id = id; 675 if (type == USRQUOTA) 676 dst->d_flags = FS_USER_QUOTA; 677 else if (type == PRJQUOTA) 678 dst->d_flags = FS_PROJ_QUOTA; 679 else 680 dst->d_flags = FS_GROUP_QUOTA; 681 dst->d_blk_hardlimit = quota_btobb(src->d_spc_hardlimit); 682 dst->d_blk_softlimit = quota_btobb(src->d_spc_softlimit); 683 dst->d_ino_hardlimit = src->d_ino_hardlimit; 684 dst->d_ino_softlimit = src->d_ino_softlimit; 685 dst->d_bcount = quota_btobb(src->d_space); 686 dst->d_icount = src->d_ino_count; 687 copy_to_xfs_dqblk_ts(dst, &dst->d_itimer, &dst->d_itimer_hi, 688 src->d_ino_timer); 689 copy_to_xfs_dqblk_ts(dst, &dst->d_btimer, &dst->d_btimer_hi, 690 src->d_spc_timer); 691 dst->d_iwarns = src->d_ino_warns; 692 dst->d_bwarns = src->d_spc_warns; 693 dst->d_rtb_hardlimit = quota_btobb(src->d_rt_spc_hardlimit); 694 dst->d_rtb_softlimit = quota_btobb(src->d_rt_spc_softlimit); 695 dst->d_rtbcount = quota_btobb(src->d_rt_space); 696 copy_to_xfs_dqblk_ts(dst, &dst->d_rtbtimer, &dst->d_rtbtimer_hi, 697 src->d_rt_spc_timer); 698 dst->d_rtbwarns = src->d_rt_spc_warns; 699 } 700 701 static int quota_getxquota(struct super_block *sb, int type, qid_t id, 702 void __user *addr) 703 { 704 struct fs_disk_quota fdq; 705 struct qc_dqblk qdq; 706 struct kqid qid; 707 int ret; 708 709 if (!sb->s_qcop->get_dqblk) 710 return -ENOSYS; 711 qid = make_kqid(current_user_ns(), type, id); 712 if (!qid_has_mapping(sb->s_user_ns, qid)) 713 return -EINVAL; 714 ret = sb->s_qcop->get_dqblk(sb, qid, &qdq); 715 if (ret) 716 return ret; 717 copy_to_xfs_dqblk(&fdq, &qdq, type, id); 718 if (copy_to_user(addr, &fdq, sizeof(fdq))) 719 return -EFAULT; 720 return ret; 721 } 722 723 /* 724 * Return quota for next active quota >= this id, if any exists, 725 * otherwise return -ENOENT via ->get_nextdqblk. 726 */ 727 static int quota_getnextxquota(struct super_block *sb, int type, qid_t id, 728 void __user *addr) 729 { 730 struct fs_disk_quota fdq; 731 struct qc_dqblk qdq; 732 struct kqid qid; 733 qid_t id_out; 734 int ret; 735 736 if (!sb->s_qcop->get_nextdqblk) 737 return -ENOSYS; 738 qid = make_kqid(current_user_ns(), type, id); 739 if (!qid_has_mapping(sb->s_user_ns, qid)) 740 return -EINVAL; 741 ret = sb->s_qcop->get_nextdqblk(sb, &qid, &qdq); 742 if (ret) 743 return ret; 744 id_out = from_kqid(current_user_ns(), qid); 745 copy_to_xfs_dqblk(&fdq, &qdq, type, id_out); 746 if (copy_to_user(addr, &fdq, sizeof(fdq))) 747 return -EFAULT; 748 return ret; 749 } 750 751 static int quota_rmxquota(struct super_block *sb, void __user *addr) 752 { 753 __u32 flags; 754 755 if (copy_from_user(&flags, addr, sizeof(flags))) 756 return -EFAULT; 757 if (!sb->s_qcop->rm_xquota) 758 return -ENOSYS; 759 return sb->s_qcop->rm_xquota(sb, flags); 760 } 761 762 /* Copy parameters and call proper function */ 763 static int do_quotactl(struct super_block *sb, int type, int cmd, qid_t id, 764 void __user *addr, const struct path *path) 765 { 766 int ret; 767 768 type = array_index_nospec(type, MAXQUOTAS); 769 /* 770 * Quota not supported on this fs? Check this before s_quota_types 771 * since they needn't be set if quota is not supported at all. 772 */ 773 if (!sb->s_qcop) 774 return -ENOSYS; 775 if (!(sb->s_quota_types & (1 << type))) 776 return -EINVAL; 777 778 ret = check_quotactl_permission(sb, type, cmd, id); 779 if (ret < 0) 780 return ret; 781 782 switch (cmd) { 783 case Q_QUOTAON: 784 return quota_quotaon(sb, type, id, path); 785 case Q_QUOTAOFF: 786 return quota_quotaoff(sb, type); 787 case Q_GETFMT: 788 return quota_getfmt(sb, type, addr); 789 case Q_GETINFO: 790 return quota_getinfo(sb, type, addr); 791 case Q_SETINFO: 792 return quota_setinfo(sb, type, addr); 793 case Q_GETQUOTA: 794 return quota_getquota(sb, type, id, addr); 795 case Q_GETNEXTQUOTA: 796 return quota_getnextquota(sb, type, id, addr); 797 case Q_SETQUOTA: 798 return quota_setquota(sb, type, id, addr); 799 case Q_SYNC: 800 if (!sb->s_qcop->quota_sync) 801 return -ENOSYS; 802 return sb->s_qcop->quota_sync(sb, type); 803 case Q_XQUOTAON: 804 return quota_enable(sb, addr); 805 case Q_XQUOTAOFF: 806 return quota_disable(sb, addr); 807 case Q_XQUOTARM: 808 return quota_rmxquota(sb, addr); 809 case Q_XGETQSTAT: 810 return quota_getxstate(sb, type, addr); 811 case Q_XGETQSTATV: 812 return quota_getxstatev(sb, type, addr); 813 case Q_XSETQLIM: 814 return quota_setxquota(sb, type, id, addr); 815 case Q_XGETQUOTA: 816 return quota_getxquota(sb, type, id, addr); 817 case Q_XGETNEXTQUOTA: 818 return quota_getnextxquota(sb, type, id, addr); 819 case Q_XQUOTASYNC: 820 if (sb_rdonly(sb)) 821 return -EROFS; 822 /* XFS quotas are fully coherent now, making this call a noop */ 823 return 0; 824 default: 825 return -EINVAL; 826 } 827 } 828 829 #ifdef CONFIG_BLOCK 830 831 /* Return 1 if 'cmd' will block on frozen filesystem */ 832 static int quotactl_cmd_write(int cmd) 833 { 834 /* 835 * We cannot allow Q_GETQUOTA and Q_GETNEXTQUOTA without write access 836 * as dquot_acquire() may allocate space for new structure and OCFS2 837 * needs to increment on-disk use count. 838 */ 839 switch (cmd) { 840 case Q_GETFMT: 841 case Q_GETINFO: 842 case Q_SYNC: 843 case Q_XGETQSTAT: 844 case Q_XGETQSTATV: 845 case Q_XGETQUOTA: 846 case Q_XGETNEXTQUOTA: 847 case Q_XQUOTASYNC: 848 return 0; 849 } 850 return 1; 851 } 852 #endif /* CONFIG_BLOCK */ 853 854 /* Return true if quotactl command is manipulating quota on/off state */ 855 static bool quotactl_cmd_onoff(int cmd) 856 { 857 return (cmd == Q_QUOTAON) || (cmd == Q_QUOTAOFF) || 858 (cmd == Q_XQUOTAON) || (cmd == Q_XQUOTAOFF); 859 } 860 861 /* 862 * look up a superblock on which quota ops will be performed 863 * - use the name of a block device to find the superblock thereon 864 */ 865 static struct super_block *quotactl_block(const char __user *special, int cmd) 866 { 867 #ifdef CONFIG_BLOCK 868 struct block_device *bdev; 869 struct super_block *sb; 870 struct filename *tmp = getname(special); 871 872 if (IS_ERR(tmp)) 873 return ERR_CAST(tmp); 874 bdev = lookup_bdev(tmp->name); 875 putname(tmp); 876 if (IS_ERR(bdev)) 877 return ERR_CAST(bdev); 878 if (quotactl_cmd_onoff(cmd)) 879 sb = get_super_exclusive_thawed(bdev); 880 else if (quotactl_cmd_write(cmd)) 881 sb = get_super_thawed(bdev); 882 else 883 sb = get_super(bdev); 884 bdput(bdev); 885 if (!sb) 886 return ERR_PTR(-ENODEV); 887 888 return sb; 889 #else 890 return ERR_PTR(-ENODEV); 891 #endif 892 } 893 894 /* 895 * This is the system call interface. This communicates with 896 * the user-level programs. Currently this only supports diskquota 897 * calls. Maybe we need to add the process quotas etc. in the future, 898 * but we probably should use rlimits for that. 899 */ 900 SYSCALL_DEFINE4(quotactl, unsigned int, cmd, const char __user *, special, 901 qid_t, id, void __user *, addr) 902 { 903 uint cmds, type; 904 struct super_block *sb = NULL; 905 struct path path, *pathp = NULL; 906 int ret; 907 908 cmds = cmd >> SUBCMDSHIFT; 909 type = cmd & SUBCMDMASK; 910 911 if (type >= MAXQUOTAS) 912 return -EINVAL; 913 914 /* 915 * As a special case Q_SYNC can be called without a specific device. 916 * It will iterate all superblocks that have quota enabled and call 917 * the sync action on each of them. 918 */ 919 if (!special) { 920 if (cmds == Q_SYNC) 921 return quota_sync_all(type); 922 return -ENODEV; 923 } 924 925 /* 926 * Path for quotaon has to be resolved before grabbing superblock 927 * because that gets s_umount sem which is also possibly needed by path 928 * resolution (think about autofs) and thus deadlocks could arise. 929 */ 930 if (cmds == Q_QUOTAON) { 931 ret = user_path_at(AT_FDCWD, addr, LOOKUP_FOLLOW|LOOKUP_AUTOMOUNT, &path); 932 if (ret) 933 pathp = ERR_PTR(ret); 934 else 935 pathp = &path; 936 } 937 938 sb = quotactl_block(special, cmds); 939 if (IS_ERR(sb)) { 940 ret = PTR_ERR(sb); 941 goto out; 942 } 943 944 ret = do_quotactl(sb, type, cmds, id, addr, pathp); 945 946 if (!quotactl_cmd_onoff(cmds)) 947 drop_super(sb); 948 else 949 drop_super_exclusive(sb); 950 out: 951 if (pathp && !IS_ERR(pathp)) 952 path_put(pathp); 953 return ret; 954 } 955