1 /* 2 * Quota code necessary even when VFS quota support is not compiled 3 * into the kernel. The interesting stuff is over in dquot.c, here 4 * we have symbols for initial quotactl(2) handling, the sysctl(2) 5 * variables, etc - things needed even when quota support disabled. 6 */ 7 8 #include <linux/fs.h> 9 #include <linux/namei.h> 10 #include <linux/slab.h> 11 #include <asm/current.h> 12 #include <linux/uaccess.h> 13 #include <linux/kernel.h> 14 #include <linux/security.h> 15 #include <linux/syscalls.h> 16 #include <linux/capability.h> 17 #include <linux/quotaops.h> 18 #include <linux/types.h> 19 #include <linux/writeback.h> 20 21 static int check_quotactl_permission(struct super_block *sb, int type, int cmd, 22 qid_t id) 23 { 24 switch (cmd) { 25 /* these commands do not require any special privilegues */ 26 case Q_GETFMT: 27 case Q_SYNC: 28 case Q_GETINFO: 29 case Q_XGETQSTAT: 30 case Q_XGETQSTATV: 31 case Q_XQUOTASYNC: 32 break; 33 /* allow to query information for dquots we "own" */ 34 case Q_GETQUOTA: 35 case Q_XGETQUOTA: 36 if ((type == USRQUOTA && uid_eq(current_euid(), make_kuid(current_user_ns(), id))) || 37 (type == GRPQUOTA && in_egroup_p(make_kgid(current_user_ns(), id)))) 38 break; 39 /*FALLTHROUGH*/ 40 default: 41 if (!capable(CAP_SYS_ADMIN)) 42 return -EPERM; 43 } 44 45 return security_quotactl(cmd, type, id, sb); 46 } 47 48 static void quota_sync_one(struct super_block *sb, void *arg) 49 { 50 int type = *(int *)arg; 51 52 if (sb->s_qcop && sb->s_qcop->quota_sync && 53 (sb->s_quota_types & (1 << type))) 54 sb->s_qcop->quota_sync(sb, type); 55 } 56 57 static int quota_sync_all(int type) 58 { 59 int ret; 60 61 if (type >= MAXQUOTAS) 62 return -EINVAL; 63 ret = security_quotactl(Q_SYNC, type, 0, NULL); 64 if (!ret) 65 iterate_supers(quota_sync_one, &type); 66 return ret; 67 } 68 69 unsigned int qtype_enforce_flag(int type) 70 { 71 switch (type) { 72 case USRQUOTA: 73 return FS_QUOTA_UDQ_ENFD; 74 case GRPQUOTA: 75 return FS_QUOTA_GDQ_ENFD; 76 case PRJQUOTA: 77 return FS_QUOTA_PDQ_ENFD; 78 } 79 return 0; 80 } 81 82 static int quota_quotaon(struct super_block *sb, int type, qid_t id, 83 struct path *path) 84 { 85 if (!sb->s_qcop->quota_on && !sb->s_qcop->quota_enable) 86 return -ENOSYS; 87 if (sb->s_qcop->quota_enable) 88 return sb->s_qcop->quota_enable(sb, qtype_enforce_flag(type)); 89 if (IS_ERR(path)) 90 return PTR_ERR(path); 91 return sb->s_qcop->quota_on(sb, type, id, path); 92 } 93 94 static int quota_quotaoff(struct super_block *sb, int type) 95 { 96 if (!sb->s_qcop->quota_off && !sb->s_qcop->quota_disable) 97 return -ENOSYS; 98 if (sb->s_qcop->quota_disable) 99 return sb->s_qcop->quota_disable(sb, qtype_enforce_flag(type)); 100 return sb->s_qcop->quota_off(sb, type); 101 } 102 103 static int quota_getfmt(struct super_block *sb, int type, void __user *addr) 104 { 105 __u32 fmt; 106 107 if (!sb_has_quota_active(sb, type)) 108 return -ESRCH; 109 fmt = sb_dqopt(sb)->info[type].dqi_format->qf_fmt_id; 110 if (copy_to_user(addr, &fmt, sizeof(fmt))) 111 return -EFAULT; 112 return 0; 113 } 114 115 static int quota_getinfo(struct super_block *sb, int type, void __user *addr) 116 { 117 struct qc_state state; 118 struct qc_type_state *tstate; 119 struct if_dqinfo uinfo; 120 int ret; 121 122 /* This checks whether qc_state has enough entries... */ 123 BUILD_BUG_ON(MAXQUOTAS > XQM_MAXQUOTAS); 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, struct fs_quota_stat *fqs) 335 { 336 int type; 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 * GETXSTATE quotactl has space for just one set of time limits so 354 * report them for the first enabled quota type 355 */ 356 for (type = 0; type < XQM_MAXQUOTAS; type++) 357 if (state.s_state[type].flags & QCI_ACCT_ENABLED) 358 break; 359 BUG_ON(type == XQM_MAXQUOTAS); 360 fqs->qs_btimelimit = state.s_state[type].spc_timelimit; 361 fqs->qs_itimelimit = state.s_state[type].ino_timelimit; 362 fqs->qs_rtbtimelimit = state.s_state[type].rt_spc_timelimit; 363 fqs->qs_bwarnlimit = state.s_state[type].spc_warnlimit; 364 fqs->qs_iwarnlimit = state.s_state[type].ino_warnlimit; 365 366 /* Inodes may be allocated even if inactive; copy out if present */ 367 if (state.s_state[USRQUOTA].ino) { 368 fqs->qs_uquota.qfs_ino = state.s_state[USRQUOTA].ino; 369 fqs->qs_uquota.qfs_nblks = state.s_state[USRQUOTA].blocks; 370 fqs->qs_uquota.qfs_nextents = state.s_state[USRQUOTA].nextents; 371 } 372 if (state.s_state[GRPQUOTA].ino) { 373 fqs->qs_gquota.qfs_ino = state.s_state[GRPQUOTA].ino; 374 fqs->qs_gquota.qfs_nblks = state.s_state[GRPQUOTA].blocks; 375 fqs->qs_gquota.qfs_nextents = state.s_state[GRPQUOTA].nextents; 376 } 377 if (state.s_state[PRJQUOTA].ino) { 378 /* 379 * Q_XGETQSTAT doesn't have room for both group and project 380 * quotas. So, allow the project quota values to be copied out 381 * only if there is no group quota information available. 382 */ 383 if (!(state.s_state[GRPQUOTA].flags & QCI_ACCT_ENABLED)) { 384 fqs->qs_gquota.qfs_ino = state.s_state[PRJQUOTA].ino; 385 fqs->qs_gquota.qfs_nblks = 386 state.s_state[PRJQUOTA].blocks; 387 fqs->qs_gquota.qfs_nextents = 388 state.s_state[PRJQUOTA].nextents; 389 } 390 } 391 return 0; 392 } 393 394 static int quota_getxstate(struct super_block *sb, void __user *addr) 395 { 396 struct fs_quota_stat fqs; 397 int ret; 398 399 if (!sb->s_qcop->get_state) 400 return -ENOSYS; 401 ret = quota_getstate(sb, &fqs); 402 if (!ret && copy_to_user(addr, &fqs, sizeof(fqs))) 403 return -EFAULT; 404 return ret; 405 } 406 407 static int quota_getstatev(struct super_block *sb, struct fs_quota_statv *fqs) 408 { 409 int type; 410 struct qc_state state; 411 int ret; 412 413 memset(&state, 0, sizeof (struct qc_state)); 414 ret = sb->s_qcop->get_state(sb, &state); 415 if (ret < 0) 416 return ret; 417 418 memset(fqs, 0, sizeof(*fqs)); 419 fqs->qs_version = FS_QSTAT_VERSION; 420 fqs->qs_flags = quota_state_to_flags(&state); 421 /* No quota enabled? */ 422 if (!fqs->qs_flags) 423 return -ENOSYS; 424 fqs->qs_incoredqs = state.s_incoredqs; 425 /* 426 * GETXSTATV quotactl has space for just one set of time limits so 427 * report them for the first enabled quota type 428 */ 429 for (type = 0; type < XQM_MAXQUOTAS; type++) 430 if (state.s_state[type].flags & QCI_ACCT_ENABLED) 431 break; 432 BUG_ON(type == XQM_MAXQUOTAS); 433 fqs->qs_btimelimit = state.s_state[type].spc_timelimit; 434 fqs->qs_itimelimit = state.s_state[type].ino_timelimit; 435 fqs->qs_rtbtimelimit = state.s_state[type].rt_spc_timelimit; 436 fqs->qs_bwarnlimit = state.s_state[type].spc_warnlimit; 437 fqs->qs_iwarnlimit = state.s_state[type].ino_warnlimit; 438 439 /* Inodes may be allocated even if inactive; copy out if present */ 440 if (state.s_state[USRQUOTA].ino) { 441 fqs->qs_uquota.qfs_ino = state.s_state[USRQUOTA].ino; 442 fqs->qs_uquota.qfs_nblks = state.s_state[USRQUOTA].blocks; 443 fqs->qs_uquota.qfs_nextents = state.s_state[USRQUOTA].nextents; 444 } 445 if (state.s_state[GRPQUOTA].ino) { 446 fqs->qs_gquota.qfs_ino = state.s_state[GRPQUOTA].ino; 447 fqs->qs_gquota.qfs_nblks = state.s_state[GRPQUOTA].blocks; 448 fqs->qs_gquota.qfs_nextents = state.s_state[GRPQUOTA].nextents; 449 } 450 if (state.s_state[PRJQUOTA].ino) { 451 fqs->qs_pquota.qfs_ino = state.s_state[PRJQUOTA].ino; 452 fqs->qs_pquota.qfs_nblks = state.s_state[PRJQUOTA].blocks; 453 fqs->qs_pquota.qfs_nextents = state.s_state[PRJQUOTA].nextents; 454 } 455 return 0; 456 } 457 458 static int quota_getxstatev(struct super_block *sb, void __user *addr) 459 { 460 struct fs_quota_statv fqs; 461 int ret; 462 463 if (!sb->s_qcop->get_state) 464 return -ENOSYS; 465 466 memset(&fqs, 0, sizeof(fqs)); 467 if (copy_from_user(&fqs, addr, 1)) /* Just read qs_version */ 468 return -EFAULT; 469 470 /* If this kernel doesn't support user specified version, fail */ 471 switch (fqs.qs_version) { 472 case FS_QSTATV_VERSION1: 473 break; 474 default: 475 return -EINVAL; 476 } 477 ret = quota_getstatev(sb, &fqs); 478 if (!ret && copy_to_user(addr, &fqs, sizeof(fqs))) 479 return -EFAULT; 480 return ret; 481 } 482 483 /* 484 * XFS defines BBTOB and BTOBB macros inside fs/xfs/ and we cannot move them 485 * out of there as xfsprogs rely on definitions being in that header file. So 486 * just define same functions here for quota purposes. 487 */ 488 #define XFS_BB_SHIFT 9 489 490 static inline u64 quota_bbtob(u64 blocks) 491 { 492 return blocks << XFS_BB_SHIFT; 493 } 494 495 static inline u64 quota_btobb(u64 bytes) 496 { 497 return (bytes + (1 << XFS_BB_SHIFT) - 1) >> XFS_BB_SHIFT; 498 } 499 500 static void copy_from_xfs_dqblk(struct qc_dqblk *dst, struct fs_disk_quota *src) 501 { 502 dst->d_spc_hardlimit = quota_bbtob(src->d_blk_hardlimit); 503 dst->d_spc_softlimit = quota_bbtob(src->d_blk_softlimit); 504 dst->d_ino_hardlimit = src->d_ino_hardlimit; 505 dst->d_ino_softlimit = src->d_ino_softlimit; 506 dst->d_space = quota_bbtob(src->d_bcount); 507 dst->d_ino_count = src->d_icount; 508 dst->d_ino_timer = src->d_itimer; 509 dst->d_spc_timer = src->d_btimer; 510 dst->d_ino_warns = src->d_iwarns; 511 dst->d_spc_warns = src->d_bwarns; 512 dst->d_rt_spc_hardlimit = quota_bbtob(src->d_rtb_hardlimit); 513 dst->d_rt_spc_softlimit = quota_bbtob(src->d_rtb_softlimit); 514 dst->d_rt_space = quota_bbtob(src->d_rtbcount); 515 dst->d_rt_spc_timer = src->d_rtbtimer; 516 dst->d_rt_spc_warns = src->d_rtbwarns; 517 dst->d_fieldmask = 0; 518 if (src->d_fieldmask & FS_DQ_ISOFT) 519 dst->d_fieldmask |= QC_INO_SOFT; 520 if (src->d_fieldmask & FS_DQ_IHARD) 521 dst->d_fieldmask |= QC_INO_HARD; 522 if (src->d_fieldmask & FS_DQ_BSOFT) 523 dst->d_fieldmask |= QC_SPC_SOFT; 524 if (src->d_fieldmask & FS_DQ_BHARD) 525 dst->d_fieldmask |= QC_SPC_HARD; 526 if (src->d_fieldmask & FS_DQ_RTBSOFT) 527 dst->d_fieldmask |= QC_RT_SPC_SOFT; 528 if (src->d_fieldmask & FS_DQ_RTBHARD) 529 dst->d_fieldmask |= QC_RT_SPC_HARD; 530 if (src->d_fieldmask & FS_DQ_BTIMER) 531 dst->d_fieldmask |= QC_SPC_TIMER; 532 if (src->d_fieldmask & FS_DQ_ITIMER) 533 dst->d_fieldmask |= QC_INO_TIMER; 534 if (src->d_fieldmask & FS_DQ_RTBTIMER) 535 dst->d_fieldmask |= QC_RT_SPC_TIMER; 536 if (src->d_fieldmask & FS_DQ_BWARNS) 537 dst->d_fieldmask |= QC_SPC_WARNS; 538 if (src->d_fieldmask & FS_DQ_IWARNS) 539 dst->d_fieldmask |= QC_INO_WARNS; 540 if (src->d_fieldmask & FS_DQ_RTBWARNS) 541 dst->d_fieldmask |= QC_RT_SPC_WARNS; 542 if (src->d_fieldmask & FS_DQ_BCOUNT) 543 dst->d_fieldmask |= QC_SPACE; 544 if (src->d_fieldmask & FS_DQ_ICOUNT) 545 dst->d_fieldmask |= QC_INO_COUNT; 546 if (src->d_fieldmask & FS_DQ_RTBCOUNT) 547 dst->d_fieldmask |= QC_RT_SPACE; 548 } 549 550 static void copy_qcinfo_from_xfs_dqblk(struct qc_info *dst, 551 struct fs_disk_quota *src) 552 { 553 memset(dst, 0, sizeof(*dst)); 554 dst->i_spc_timelimit = src->d_btimer; 555 dst->i_ino_timelimit = src->d_itimer; 556 dst->i_rt_spc_timelimit = src->d_rtbtimer; 557 dst->i_ino_warnlimit = src->d_iwarns; 558 dst->i_spc_warnlimit = src->d_bwarns; 559 dst->i_rt_spc_warnlimit = src->d_rtbwarns; 560 if (src->d_fieldmask & FS_DQ_BWARNS) 561 dst->i_fieldmask |= QC_SPC_WARNS; 562 if (src->d_fieldmask & FS_DQ_IWARNS) 563 dst->i_fieldmask |= QC_INO_WARNS; 564 if (src->d_fieldmask & FS_DQ_RTBWARNS) 565 dst->i_fieldmask |= QC_RT_SPC_WARNS; 566 if (src->d_fieldmask & FS_DQ_BTIMER) 567 dst->i_fieldmask |= QC_SPC_TIMER; 568 if (src->d_fieldmask & FS_DQ_ITIMER) 569 dst->i_fieldmask |= QC_INO_TIMER; 570 if (src->d_fieldmask & FS_DQ_RTBTIMER) 571 dst->i_fieldmask |= QC_RT_SPC_TIMER; 572 } 573 574 static int quota_setxquota(struct super_block *sb, int type, qid_t id, 575 void __user *addr) 576 { 577 struct fs_disk_quota fdq; 578 struct qc_dqblk qdq; 579 struct kqid qid; 580 581 if (copy_from_user(&fdq, addr, sizeof(fdq))) 582 return -EFAULT; 583 if (!sb->s_qcop->set_dqblk) 584 return -ENOSYS; 585 qid = make_kqid(current_user_ns(), type, id); 586 if (!qid_has_mapping(sb->s_user_ns, qid)) 587 return -EINVAL; 588 /* Are we actually setting timer / warning limits for all users? */ 589 if (from_kqid(sb->s_user_ns, qid) == 0 && 590 fdq.d_fieldmask & (FS_DQ_WARNS_MASK | FS_DQ_TIMER_MASK)) { 591 struct qc_info qinfo; 592 int ret; 593 594 if (!sb->s_qcop->set_info) 595 return -EINVAL; 596 copy_qcinfo_from_xfs_dqblk(&qinfo, &fdq); 597 ret = sb->s_qcop->set_info(sb, type, &qinfo); 598 if (ret) 599 return ret; 600 /* These are already done */ 601 fdq.d_fieldmask &= ~(FS_DQ_WARNS_MASK | FS_DQ_TIMER_MASK); 602 } 603 copy_from_xfs_dqblk(&qdq, &fdq); 604 return sb->s_qcop->set_dqblk(sb, qid, &qdq); 605 } 606 607 static void copy_to_xfs_dqblk(struct fs_disk_quota *dst, struct qc_dqblk *src, 608 int type, qid_t id) 609 { 610 memset(dst, 0, sizeof(*dst)); 611 dst->d_version = FS_DQUOT_VERSION; 612 dst->d_id = id; 613 if (type == USRQUOTA) 614 dst->d_flags = FS_USER_QUOTA; 615 else if (type == PRJQUOTA) 616 dst->d_flags = FS_PROJ_QUOTA; 617 else 618 dst->d_flags = FS_GROUP_QUOTA; 619 dst->d_blk_hardlimit = quota_btobb(src->d_spc_hardlimit); 620 dst->d_blk_softlimit = quota_btobb(src->d_spc_softlimit); 621 dst->d_ino_hardlimit = src->d_ino_hardlimit; 622 dst->d_ino_softlimit = src->d_ino_softlimit; 623 dst->d_bcount = quota_btobb(src->d_space); 624 dst->d_icount = src->d_ino_count; 625 dst->d_itimer = src->d_ino_timer; 626 dst->d_btimer = src->d_spc_timer; 627 dst->d_iwarns = src->d_ino_warns; 628 dst->d_bwarns = src->d_spc_warns; 629 dst->d_rtb_hardlimit = quota_btobb(src->d_rt_spc_hardlimit); 630 dst->d_rtb_softlimit = quota_btobb(src->d_rt_spc_softlimit); 631 dst->d_rtbcount = quota_btobb(src->d_rt_space); 632 dst->d_rtbtimer = src->d_rt_spc_timer; 633 dst->d_rtbwarns = src->d_rt_spc_warns; 634 } 635 636 static int quota_getxquota(struct super_block *sb, int type, qid_t id, 637 void __user *addr) 638 { 639 struct fs_disk_quota fdq; 640 struct qc_dqblk qdq; 641 struct kqid qid; 642 int ret; 643 644 if (!sb->s_qcop->get_dqblk) 645 return -ENOSYS; 646 qid = make_kqid(current_user_ns(), type, id); 647 if (!qid_has_mapping(sb->s_user_ns, qid)) 648 return -EINVAL; 649 ret = sb->s_qcop->get_dqblk(sb, qid, &qdq); 650 if (ret) 651 return ret; 652 copy_to_xfs_dqblk(&fdq, &qdq, type, id); 653 if (copy_to_user(addr, &fdq, sizeof(fdq))) 654 return -EFAULT; 655 return ret; 656 } 657 658 /* 659 * Return quota for next active quota >= this id, if any exists, 660 * otherwise return -ENOENT via ->get_nextdqblk. 661 */ 662 static int quota_getnextxquota(struct super_block *sb, int type, qid_t id, 663 void __user *addr) 664 { 665 struct fs_disk_quota fdq; 666 struct qc_dqblk qdq; 667 struct kqid qid; 668 qid_t id_out; 669 int ret; 670 671 if (!sb->s_qcop->get_nextdqblk) 672 return -ENOSYS; 673 qid = make_kqid(current_user_ns(), type, id); 674 if (!qid_has_mapping(sb->s_user_ns, qid)) 675 return -EINVAL; 676 ret = sb->s_qcop->get_nextdqblk(sb, &qid, &qdq); 677 if (ret) 678 return ret; 679 id_out = from_kqid(current_user_ns(), qid); 680 copy_to_xfs_dqblk(&fdq, &qdq, type, id_out); 681 if (copy_to_user(addr, &fdq, sizeof(fdq))) 682 return -EFAULT; 683 return ret; 684 } 685 686 static int quota_rmxquota(struct super_block *sb, void __user *addr) 687 { 688 __u32 flags; 689 690 if (copy_from_user(&flags, addr, sizeof(flags))) 691 return -EFAULT; 692 if (!sb->s_qcop->rm_xquota) 693 return -ENOSYS; 694 return sb->s_qcop->rm_xquota(sb, flags); 695 } 696 697 /* Copy parameters and call proper function */ 698 static int do_quotactl(struct super_block *sb, int type, int cmd, qid_t id, 699 void __user *addr, struct path *path) 700 { 701 int ret; 702 703 if (type >= (XQM_COMMAND(cmd) ? XQM_MAXQUOTAS : MAXQUOTAS)) 704 return -EINVAL; 705 /* 706 * Quota not supported on this fs? Check this before s_quota_types 707 * since they needn't be set if quota is not supported at all. 708 */ 709 if (!sb->s_qcop) 710 return -ENOSYS; 711 if (!(sb->s_quota_types & (1 << type))) 712 return -EINVAL; 713 714 ret = check_quotactl_permission(sb, type, cmd, id); 715 if (ret < 0) 716 return ret; 717 718 switch (cmd) { 719 case Q_QUOTAON: 720 return quota_quotaon(sb, type, id, path); 721 case Q_QUOTAOFF: 722 return quota_quotaoff(sb, type); 723 case Q_GETFMT: 724 return quota_getfmt(sb, type, addr); 725 case Q_GETINFO: 726 return quota_getinfo(sb, type, addr); 727 case Q_SETINFO: 728 return quota_setinfo(sb, type, addr); 729 case Q_GETQUOTA: 730 return quota_getquota(sb, type, id, addr); 731 case Q_GETNEXTQUOTA: 732 return quota_getnextquota(sb, type, id, addr); 733 case Q_SETQUOTA: 734 return quota_setquota(sb, type, id, addr); 735 case Q_SYNC: 736 if (!sb->s_qcop->quota_sync) 737 return -ENOSYS; 738 return sb->s_qcop->quota_sync(sb, type); 739 case Q_XQUOTAON: 740 return quota_enable(sb, addr); 741 case Q_XQUOTAOFF: 742 return quota_disable(sb, addr); 743 case Q_XQUOTARM: 744 return quota_rmxquota(sb, addr); 745 case Q_XGETQSTAT: 746 return quota_getxstate(sb, addr); 747 case Q_XGETQSTATV: 748 return quota_getxstatev(sb, addr); 749 case Q_XSETQLIM: 750 return quota_setxquota(sb, type, id, addr); 751 case Q_XGETQUOTA: 752 return quota_getxquota(sb, type, id, addr); 753 case Q_XGETNEXTQUOTA: 754 return quota_getnextxquota(sb, type, id, addr); 755 case Q_XQUOTASYNC: 756 if (sb->s_flags & MS_RDONLY) 757 return -EROFS; 758 /* XFS quotas are fully coherent now, making this call a noop */ 759 return 0; 760 default: 761 return -EINVAL; 762 } 763 } 764 765 #ifdef CONFIG_BLOCK 766 767 /* Return 1 if 'cmd' will block on frozen filesystem */ 768 static int quotactl_cmd_write(int cmd) 769 { 770 /* 771 * We cannot allow Q_GETQUOTA and Q_GETNEXTQUOTA without write access 772 * as dquot_acquire() may allocate space for new structure and OCFS2 773 * needs to increment on-disk use count. 774 */ 775 switch (cmd) { 776 case Q_GETFMT: 777 case Q_GETINFO: 778 case Q_SYNC: 779 case Q_XGETQSTAT: 780 case Q_XGETQSTATV: 781 case Q_XGETQUOTA: 782 case Q_XGETNEXTQUOTA: 783 case Q_XQUOTASYNC: 784 return 0; 785 } 786 return 1; 787 } 788 #endif /* CONFIG_BLOCK */ 789 790 /* Return true if quotactl command is manipulating quota on/off state */ 791 static bool quotactl_cmd_onoff(int cmd) 792 { 793 return (cmd == Q_QUOTAON) || (cmd == Q_QUOTAOFF); 794 } 795 796 /* 797 * look up a superblock on which quota ops will be performed 798 * - use the name of a block device to find the superblock thereon 799 */ 800 static struct super_block *quotactl_block(const char __user *special, int cmd) 801 { 802 #ifdef CONFIG_BLOCK 803 struct block_device *bdev; 804 struct super_block *sb; 805 struct filename *tmp = getname(special); 806 807 if (IS_ERR(tmp)) 808 return ERR_CAST(tmp); 809 bdev = lookup_bdev(tmp->name); 810 putname(tmp); 811 if (IS_ERR(bdev)) 812 return ERR_CAST(bdev); 813 if (quotactl_cmd_onoff(cmd)) 814 sb = get_super_exclusive_thawed(bdev); 815 else if (quotactl_cmd_write(cmd)) 816 sb = get_super_thawed(bdev); 817 else 818 sb = get_super(bdev); 819 bdput(bdev); 820 if (!sb) 821 return ERR_PTR(-ENODEV); 822 823 return sb; 824 #else 825 return ERR_PTR(-ENODEV); 826 #endif 827 } 828 829 /* 830 * This is the system call interface. This communicates with 831 * the user-level programs. Currently this only supports diskquota 832 * calls. Maybe we need to add the process quotas etc. in the future, 833 * but we probably should use rlimits for that. 834 */ 835 SYSCALL_DEFINE4(quotactl, unsigned int, cmd, const char __user *, special, 836 qid_t, id, void __user *, addr) 837 { 838 uint cmds, type; 839 struct super_block *sb = NULL; 840 struct path path, *pathp = NULL; 841 int ret; 842 843 cmds = cmd >> SUBCMDSHIFT; 844 type = cmd & SUBCMDMASK; 845 846 /* 847 * As a special case Q_SYNC can be called without a specific device. 848 * It will iterate all superblocks that have quota enabled and call 849 * the sync action on each of them. 850 */ 851 if (!special) { 852 if (cmds == Q_SYNC) 853 return quota_sync_all(type); 854 return -ENODEV; 855 } 856 857 /* 858 * Path for quotaon has to be resolved before grabbing superblock 859 * because that gets s_umount sem which is also possibly needed by path 860 * resolution (think about autofs) and thus deadlocks could arise. 861 */ 862 if (cmds == Q_QUOTAON) { 863 ret = user_path_at(AT_FDCWD, addr, LOOKUP_FOLLOW|LOOKUP_AUTOMOUNT, &path); 864 if (ret) 865 pathp = ERR_PTR(ret); 866 else 867 pathp = &path; 868 } 869 870 sb = quotactl_block(special, cmds); 871 if (IS_ERR(sb)) { 872 ret = PTR_ERR(sb); 873 goto out; 874 } 875 876 ret = do_quotactl(sb, type, cmds, id, addr, pathp); 877 878 if (!quotactl_cmd_onoff(cmds)) 879 drop_super(sb); 880 else 881 drop_super_exclusive(sb); 882 out: 883 if (pathp && !IS_ERR(pathp)) 884 path_put(pathp); 885 return ret; 886 } 887