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 void copy_from_xfs_dqblk(struct qc_dqblk *dst, struct fs_disk_quota *src) 536 { 537 dst->d_spc_hardlimit = quota_bbtob(src->d_blk_hardlimit); 538 dst->d_spc_softlimit = quota_bbtob(src->d_blk_softlimit); 539 dst->d_ino_hardlimit = src->d_ino_hardlimit; 540 dst->d_ino_softlimit = src->d_ino_softlimit; 541 dst->d_space = quota_bbtob(src->d_bcount); 542 dst->d_ino_count = src->d_icount; 543 dst->d_ino_timer = src->d_itimer; 544 dst->d_spc_timer = src->d_btimer; 545 dst->d_ino_warns = src->d_iwarns; 546 dst->d_spc_warns = src->d_bwarns; 547 dst->d_rt_spc_hardlimit = quota_bbtob(src->d_rtb_hardlimit); 548 dst->d_rt_spc_softlimit = quota_bbtob(src->d_rtb_softlimit); 549 dst->d_rt_space = quota_bbtob(src->d_rtbcount); 550 dst->d_rt_spc_timer = src->d_rtbtimer; 551 dst->d_rt_spc_warns = src->d_rtbwarns; 552 dst->d_fieldmask = 0; 553 if (src->d_fieldmask & FS_DQ_ISOFT) 554 dst->d_fieldmask |= QC_INO_SOFT; 555 if (src->d_fieldmask & FS_DQ_IHARD) 556 dst->d_fieldmask |= QC_INO_HARD; 557 if (src->d_fieldmask & FS_DQ_BSOFT) 558 dst->d_fieldmask |= QC_SPC_SOFT; 559 if (src->d_fieldmask & FS_DQ_BHARD) 560 dst->d_fieldmask |= QC_SPC_HARD; 561 if (src->d_fieldmask & FS_DQ_RTBSOFT) 562 dst->d_fieldmask |= QC_RT_SPC_SOFT; 563 if (src->d_fieldmask & FS_DQ_RTBHARD) 564 dst->d_fieldmask |= QC_RT_SPC_HARD; 565 if (src->d_fieldmask & FS_DQ_BTIMER) 566 dst->d_fieldmask |= QC_SPC_TIMER; 567 if (src->d_fieldmask & FS_DQ_ITIMER) 568 dst->d_fieldmask |= QC_INO_TIMER; 569 if (src->d_fieldmask & FS_DQ_RTBTIMER) 570 dst->d_fieldmask |= QC_RT_SPC_TIMER; 571 if (src->d_fieldmask & FS_DQ_BWARNS) 572 dst->d_fieldmask |= QC_SPC_WARNS; 573 if (src->d_fieldmask & FS_DQ_IWARNS) 574 dst->d_fieldmask |= QC_INO_WARNS; 575 if (src->d_fieldmask & FS_DQ_RTBWARNS) 576 dst->d_fieldmask |= QC_RT_SPC_WARNS; 577 if (src->d_fieldmask & FS_DQ_BCOUNT) 578 dst->d_fieldmask |= QC_SPACE; 579 if (src->d_fieldmask & FS_DQ_ICOUNT) 580 dst->d_fieldmask |= QC_INO_COUNT; 581 if (src->d_fieldmask & FS_DQ_RTBCOUNT) 582 dst->d_fieldmask |= QC_RT_SPACE; 583 } 584 585 static void copy_qcinfo_from_xfs_dqblk(struct qc_info *dst, 586 struct fs_disk_quota *src) 587 { 588 memset(dst, 0, sizeof(*dst)); 589 dst->i_spc_timelimit = src->d_btimer; 590 dst->i_ino_timelimit = src->d_itimer; 591 dst->i_rt_spc_timelimit = src->d_rtbtimer; 592 dst->i_ino_warnlimit = src->d_iwarns; 593 dst->i_spc_warnlimit = src->d_bwarns; 594 dst->i_rt_spc_warnlimit = src->d_rtbwarns; 595 if (src->d_fieldmask & FS_DQ_BWARNS) 596 dst->i_fieldmask |= QC_SPC_WARNS; 597 if (src->d_fieldmask & FS_DQ_IWARNS) 598 dst->i_fieldmask |= QC_INO_WARNS; 599 if (src->d_fieldmask & FS_DQ_RTBWARNS) 600 dst->i_fieldmask |= QC_RT_SPC_WARNS; 601 if (src->d_fieldmask & FS_DQ_BTIMER) 602 dst->i_fieldmask |= QC_SPC_TIMER; 603 if (src->d_fieldmask & FS_DQ_ITIMER) 604 dst->i_fieldmask |= QC_INO_TIMER; 605 if (src->d_fieldmask & FS_DQ_RTBTIMER) 606 dst->i_fieldmask |= QC_RT_SPC_TIMER; 607 } 608 609 static int quota_setxquota(struct super_block *sb, int type, qid_t id, 610 void __user *addr) 611 { 612 struct fs_disk_quota fdq; 613 struct qc_dqblk qdq; 614 struct kqid qid; 615 616 if (copy_from_user(&fdq, addr, sizeof(fdq))) 617 return -EFAULT; 618 if (!sb->s_qcop->set_dqblk) 619 return -ENOSYS; 620 qid = make_kqid(current_user_ns(), type, id); 621 if (!qid_has_mapping(sb->s_user_ns, qid)) 622 return -EINVAL; 623 /* Are we actually setting timer / warning limits for all users? */ 624 if (from_kqid(sb->s_user_ns, qid) == 0 && 625 fdq.d_fieldmask & (FS_DQ_WARNS_MASK | FS_DQ_TIMER_MASK)) { 626 struct qc_info qinfo; 627 int ret; 628 629 if (!sb->s_qcop->set_info) 630 return -EINVAL; 631 copy_qcinfo_from_xfs_dqblk(&qinfo, &fdq); 632 ret = sb->s_qcop->set_info(sb, type, &qinfo); 633 if (ret) 634 return ret; 635 /* These are already done */ 636 fdq.d_fieldmask &= ~(FS_DQ_WARNS_MASK | FS_DQ_TIMER_MASK); 637 } 638 copy_from_xfs_dqblk(&qdq, &fdq); 639 return sb->s_qcop->set_dqblk(sb, qid, &qdq); 640 } 641 642 static void copy_to_xfs_dqblk(struct fs_disk_quota *dst, struct qc_dqblk *src, 643 int type, qid_t id) 644 { 645 memset(dst, 0, sizeof(*dst)); 646 dst->d_version = FS_DQUOT_VERSION; 647 dst->d_id = id; 648 if (type == USRQUOTA) 649 dst->d_flags = FS_USER_QUOTA; 650 else if (type == PRJQUOTA) 651 dst->d_flags = FS_PROJ_QUOTA; 652 else 653 dst->d_flags = FS_GROUP_QUOTA; 654 dst->d_blk_hardlimit = quota_btobb(src->d_spc_hardlimit); 655 dst->d_blk_softlimit = quota_btobb(src->d_spc_softlimit); 656 dst->d_ino_hardlimit = src->d_ino_hardlimit; 657 dst->d_ino_softlimit = src->d_ino_softlimit; 658 dst->d_bcount = quota_btobb(src->d_space); 659 dst->d_icount = src->d_ino_count; 660 dst->d_itimer = src->d_ino_timer; 661 dst->d_btimer = src->d_spc_timer; 662 dst->d_iwarns = src->d_ino_warns; 663 dst->d_bwarns = src->d_spc_warns; 664 dst->d_rtb_hardlimit = quota_btobb(src->d_rt_spc_hardlimit); 665 dst->d_rtb_softlimit = quota_btobb(src->d_rt_spc_softlimit); 666 dst->d_rtbcount = quota_btobb(src->d_rt_space); 667 dst->d_rtbtimer = src->d_rt_spc_timer; 668 dst->d_rtbwarns = src->d_rt_spc_warns; 669 } 670 671 static int quota_getxquota(struct super_block *sb, int type, qid_t id, 672 void __user *addr) 673 { 674 struct fs_disk_quota fdq; 675 struct qc_dqblk qdq; 676 struct kqid qid; 677 int ret; 678 679 if (!sb->s_qcop->get_dqblk) 680 return -ENOSYS; 681 qid = make_kqid(current_user_ns(), type, id); 682 if (!qid_has_mapping(sb->s_user_ns, qid)) 683 return -EINVAL; 684 ret = sb->s_qcop->get_dqblk(sb, qid, &qdq); 685 if (ret) 686 return ret; 687 copy_to_xfs_dqblk(&fdq, &qdq, type, id); 688 if (copy_to_user(addr, &fdq, sizeof(fdq))) 689 return -EFAULT; 690 return ret; 691 } 692 693 /* 694 * Return quota for next active quota >= this id, if any exists, 695 * otherwise return -ENOENT via ->get_nextdqblk. 696 */ 697 static int quota_getnextxquota(struct super_block *sb, int type, qid_t id, 698 void __user *addr) 699 { 700 struct fs_disk_quota fdq; 701 struct qc_dqblk qdq; 702 struct kqid qid; 703 qid_t id_out; 704 int ret; 705 706 if (!sb->s_qcop->get_nextdqblk) 707 return -ENOSYS; 708 qid = make_kqid(current_user_ns(), type, id); 709 if (!qid_has_mapping(sb->s_user_ns, qid)) 710 return -EINVAL; 711 ret = sb->s_qcop->get_nextdqblk(sb, &qid, &qdq); 712 if (ret) 713 return ret; 714 id_out = from_kqid(current_user_ns(), qid); 715 copy_to_xfs_dqblk(&fdq, &qdq, type, id_out); 716 if (copy_to_user(addr, &fdq, sizeof(fdq))) 717 return -EFAULT; 718 return ret; 719 } 720 721 static int quota_rmxquota(struct super_block *sb, void __user *addr) 722 { 723 __u32 flags; 724 725 if (copy_from_user(&flags, addr, sizeof(flags))) 726 return -EFAULT; 727 if (!sb->s_qcop->rm_xquota) 728 return -ENOSYS; 729 return sb->s_qcop->rm_xquota(sb, flags); 730 } 731 732 /* Copy parameters and call proper function */ 733 static int do_quotactl(struct super_block *sb, int type, int cmd, qid_t id, 734 void __user *addr, const struct path *path) 735 { 736 int ret; 737 738 type = array_index_nospec(type, MAXQUOTAS); 739 /* 740 * Quota not supported on this fs? Check this before s_quota_types 741 * since they needn't be set if quota is not supported at all. 742 */ 743 if (!sb->s_qcop) 744 return -ENOSYS; 745 if (!(sb->s_quota_types & (1 << type))) 746 return -EINVAL; 747 748 ret = check_quotactl_permission(sb, type, cmd, id); 749 if (ret < 0) 750 return ret; 751 752 switch (cmd) { 753 case Q_QUOTAON: 754 return quota_quotaon(sb, type, id, path); 755 case Q_QUOTAOFF: 756 return quota_quotaoff(sb, type); 757 case Q_GETFMT: 758 return quota_getfmt(sb, type, addr); 759 case Q_GETINFO: 760 return quota_getinfo(sb, type, addr); 761 case Q_SETINFO: 762 return quota_setinfo(sb, type, addr); 763 case Q_GETQUOTA: 764 return quota_getquota(sb, type, id, addr); 765 case Q_GETNEXTQUOTA: 766 return quota_getnextquota(sb, type, id, addr); 767 case Q_SETQUOTA: 768 return quota_setquota(sb, type, id, addr); 769 case Q_SYNC: 770 if (!sb->s_qcop->quota_sync) 771 return -ENOSYS; 772 return sb->s_qcop->quota_sync(sb, type); 773 case Q_XQUOTAON: 774 return quota_enable(sb, addr); 775 case Q_XQUOTAOFF: 776 return quota_disable(sb, addr); 777 case Q_XQUOTARM: 778 return quota_rmxquota(sb, addr); 779 case Q_XGETQSTAT: 780 return quota_getxstate(sb, type, addr); 781 case Q_XGETQSTATV: 782 return quota_getxstatev(sb, type, addr); 783 case Q_XSETQLIM: 784 return quota_setxquota(sb, type, id, addr); 785 case Q_XGETQUOTA: 786 return quota_getxquota(sb, type, id, addr); 787 case Q_XGETNEXTQUOTA: 788 return quota_getnextxquota(sb, type, id, addr); 789 case Q_XQUOTASYNC: 790 if (sb_rdonly(sb)) 791 return -EROFS; 792 /* XFS quotas are fully coherent now, making this call a noop */ 793 return 0; 794 default: 795 return -EINVAL; 796 } 797 } 798 799 #ifdef CONFIG_BLOCK 800 801 /* Return 1 if 'cmd' will block on frozen filesystem */ 802 static int quotactl_cmd_write(int cmd) 803 { 804 /* 805 * We cannot allow Q_GETQUOTA and Q_GETNEXTQUOTA without write access 806 * as dquot_acquire() may allocate space for new structure and OCFS2 807 * needs to increment on-disk use count. 808 */ 809 switch (cmd) { 810 case Q_GETFMT: 811 case Q_GETINFO: 812 case Q_SYNC: 813 case Q_XGETQSTAT: 814 case Q_XGETQSTATV: 815 case Q_XGETQUOTA: 816 case Q_XGETNEXTQUOTA: 817 case Q_XQUOTASYNC: 818 return 0; 819 } 820 return 1; 821 } 822 #endif /* CONFIG_BLOCK */ 823 824 /* Return true if quotactl command is manipulating quota on/off state */ 825 static bool quotactl_cmd_onoff(int cmd) 826 { 827 return (cmd == Q_QUOTAON) || (cmd == Q_QUOTAOFF) || 828 (cmd == Q_XQUOTAON) || (cmd == Q_XQUOTAOFF); 829 } 830 831 /* 832 * look up a superblock on which quota ops will be performed 833 * - use the name of a block device to find the superblock thereon 834 */ 835 static struct super_block *quotactl_block(const char __user *special, int cmd) 836 { 837 #ifdef CONFIG_BLOCK 838 struct block_device *bdev; 839 struct super_block *sb; 840 struct filename *tmp = getname(special); 841 842 if (IS_ERR(tmp)) 843 return ERR_CAST(tmp); 844 bdev = lookup_bdev(tmp->name); 845 putname(tmp); 846 if (IS_ERR(bdev)) 847 return ERR_CAST(bdev); 848 if (quotactl_cmd_onoff(cmd)) 849 sb = get_super_exclusive_thawed(bdev); 850 else if (quotactl_cmd_write(cmd)) 851 sb = get_super_thawed(bdev); 852 else 853 sb = get_super(bdev); 854 bdput(bdev); 855 if (!sb) 856 return ERR_PTR(-ENODEV); 857 858 return sb; 859 #else 860 return ERR_PTR(-ENODEV); 861 #endif 862 } 863 864 /* 865 * This is the system call interface. This communicates with 866 * the user-level programs. Currently this only supports diskquota 867 * calls. Maybe we need to add the process quotas etc. in the future, 868 * but we probably should use rlimits for that. 869 */ 870 SYSCALL_DEFINE4(quotactl, unsigned int, cmd, const char __user *, special, 871 qid_t, id, void __user *, addr) 872 { 873 uint cmds, type; 874 struct super_block *sb = NULL; 875 struct path path, *pathp = NULL; 876 int ret; 877 878 cmds = cmd >> SUBCMDSHIFT; 879 type = cmd & SUBCMDMASK; 880 881 if (type >= MAXQUOTAS) 882 return -EINVAL; 883 884 /* 885 * As a special case Q_SYNC can be called without a specific device. 886 * It will iterate all superblocks that have quota enabled and call 887 * the sync action on each of them. 888 */ 889 if (!special) { 890 if (cmds == Q_SYNC) 891 return quota_sync_all(type); 892 return -ENODEV; 893 } 894 895 /* 896 * Path for quotaon has to be resolved before grabbing superblock 897 * because that gets s_umount sem which is also possibly needed by path 898 * resolution (think about autofs) and thus deadlocks could arise. 899 */ 900 if (cmds == Q_QUOTAON) { 901 ret = user_path_at(AT_FDCWD, addr, LOOKUP_FOLLOW|LOOKUP_AUTOMOUNT, &path); 902 if (ret) 903 pathp = ERR_PTR(ret); 904 else 905 pathp = &path; 906 } 907 908 sb = quotactl_block(special, cmds); 909 if (IS_ERR(sb)) { 910 ret = PTR_ERR(sb); 911 goto out; 912 } 913 914 ret = do_quotactl(sb, type, cmds, id, addr, pathp); 915 916 if (!quotactl_cmd_onoff(cmds)) 917 drop_super(sb); 918 else 919 drop_super_exclusive(sb); 920 out: 921 if (pathp && !IS_ERR(pathp)) 922 path_put(pathp); 923 return ret; 924 } 925