1 // SPDX-License-Identifier: GPL-2.0
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.
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>
23 static int check_quotactl_permission(struct super_block *sb, int type, int cmd,
27 /* these commands do not require any special privilegues */
35 /* allow to query information for dquots we "own" */
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))))
43 if (!capable(CAP_SYS_ADMIN))
47 return security_quotactl(cmd, type, id, sb);
50 static void quota_sync_one(struct super_block *sb, void *arg)
52 int type = *(int *)arg;
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);
59 static int quota_sync_all(int type)
63 ret = security_quotactl(Q_SYNC, type, 0, NULL);
65 iterate_supers(quota_sync_one, &type);
69 unsigned int qtype_enforce_flag(int type)
73 return FS_QUOTA_UDQ_ENFD;
75 return FS_QUOTA_GDQ_ENFD;
77 return FS_QUOTA_PDQ_ENFD;
82 static int quota_quotaon(struct super_block *sb, int type, qid_t id,
83 const struct path *path)
85 if (!sb->s_qcop->quota_on && !sb->s_qcop->quota_enable)
87 if (sb->s_qcop->quota_enable)
88 return sb->s_qcop->quota_enable(sb, qtype_enforce_flag(type));
91 return sb->s_qcop->quota_on(sb, type, id, path);
94 static int quota_quotaoff(struct super_block *sb, int type)
96 if (!sb->s_qcop->quota_off && !sb->s_qcop->quota_disable)
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);
103 static int quota_getfmt(struct super_block *sb, int type, void __user *addr)
107 if (!sb_has_quota_active(sb, type))
109 fmt = sb_dqopt(sb)->info[type].dqi_format->qf_fmt_id;
110 if (copy_to_user(addr, &fmt, sizeof(fmt)))
115 static int quota_getinfo(struct super_block *sb, int type, void __user *addr)
117 struct qc_state state;
118 struct qc_type_state *tstate;
119 struct if_dqinfo uinfo;
122 if (!sb->s_qcop->get_state)
124 ret = sb->s_qcop->get_state(sb, &state);
127 tstate = state.s_state + type;
128 if (!(tstate->flags & QCI_ACCT_ENABLED))
130 memset(&uinfo, 0, sizeof(uinfo));
131 uinfo.dqi_bgrace = tstate->spc_timelimit;
132 uinfo.dqi_igrace = tstate->ino_timelimit;
133 if (tstate->flags & QCI_SYSFILE)
134 uinfo.dqi_flags |= DQF_SYS_FILE;
135 if (tstate->flags & QCI_ROOT_SQUASH)
136 uinfo.dqi_flags |= DQF_ROOT_SQUASH;
137 uinfo.dqi_valid = IIF_ALL;
138 if (copy_to_user(addr, &uinfo, sizeof(uinfo)))
143 static int quota_setinfo(struct super_block *sb, int type, void __user *addr)
145 struct if_dqinfo info;
146 struct qc_info qinfo;
148 if (copy_from_user(&info, addr, sizeof(info)))
150 if (!sb->s_qcop->set_info)
152 if (info.dqi_valid & ~(IIF_FLAGS | IIF_BGRACE | IIF_IGRACE))
154 memset(&qinfo, 0, sizeof(qinfo));
155 if (info.dqi_valid & IIF_FLAGS) {
156 if (info.dqi_flags & ~DQF_SETINFO_MASK)
158 if (info.dqi_flags & DQF_ROOT_SQUASH)
159 qinfo.i_flags |= QCI_ROOT_SQUASH;
160 qinfo.i_fieldmask |= QC_FLAGS;
162 if (info.dqi_valid & IIF_BGRACE) {
163 qinfo.i_spc_timelimit = info.dqi_bgrace;
164 qinfo.i_fieldmask |= QC_SPC_TIMER;
166 if (info.dqi_valid & IIF_IGRACE) {
167 qinfo.i_ino_timelimit = info.dqi_igrace;
168 qinfo.i_fieldmask |= QC_INO_TIMER;
170 return sb->s_qcop->set_info(sb, type, &qinfo);
173 static inline qsize_t qbtos(qsize_t blocks)
175 return blocks << QIF_DQBLKSIZE_BITS;
178 static inline qsize_t stoqb(qsize_t space)
180 return (space + QIF_DQBLKSIZE - 1) >> QIF_DQBLKSIZE_BITS;
183 static void copy_to_if_dqblk(struct if_dqblk *dst, struct qc_dqblk *src)
185 memset(dst, 0, sizeof(*dst));
186 dst->dqb_bhardlimit = stoqb(src->d_spc_hardlimit);
187 dst->dqb_bsoftlimit = stoqb(src->d_spc_softlimit);
188 dst->dqb_curspace = src->d_space;
189 dst->dqb_ihardlimit = src->d_ino_hardlimit;
190 dst->dqb_isoftlimit = src->d_ino_softlimit;
191 dst->dqb_curinodes = src->d_ino_count;
192 dst->dqb_btime = src->d_spc_timer;
193 dst->dqb_itime = src->d_ino_timer;
194 dst->dqb_valid = QIF_ALL;
197 static int quota_getquota(struct super_block *sb, int type, qid_t id,
205 if (!sb->s_qcop->get_dqblk)
207 qid = make_kqid(current_user_ns(), type, id);
208 if (!qid_has_mapping(sb->s_user_ns, qid))
210 ret = sb->s_qcop->get_dqblk(sb, qid, &fdq);
213 copy_to_if_dqblk(&idq, &fdq);
214 if (copy_to_user(addr, &idq, sizeof(idq)))
220 * Return quota for next active quota >= this id, if any exists,
221 * otherwise return -ENOENT via ->get_nextdqblk
223 static int quota_getnextquota(struct super_block *sb, int type, qid_t id,
228 struct if_nextdqblk idq;
231 if (!sb->s_qcop->get_nextdqblk)
233 qid = make_kqid(current_user_ns(), type, id);
234 if (!qid_has_mapping(sb->s_user_ns, qid))
236 ret = sb->s_qcop->get_nextdqblk(sb, &qid, &fdq);
239 /* struct if_nextdqblk is a superset of struct if_dqblk */
240 copy_to_if_dqblk((struct if_dqblk *)&idq, &fdq);
241 idq.dqb_id = from_kqid(current_user_ns(), qid);
242 if (copy_to_user(addr, &idq, sizeof(idq)))
247 static void copy_from_if_dqblk(struct qc_dqblk *dst, struct if_dqblk *src)
249 dst->d_spc_hardlimit = qbtos(src->dqb_bhardlimit);
250 dst->d_spc_softlimit = qbtos(src->dqb_bsoftlimit);
251 dst->d_space = src->dqb_curspace;
252 dst->d_ino_hardlimit = src->dqb_ihardlimit;
253 dst->d_ino_softlimit = src->dqb_isoftlimit;
254 dst->d_ino_count = src->dqb_curinodes;
255 dst->d_spc_timer = src->dqb_btime;
256 dst->d_ino_timer = src->dqb_itime;
258 dst->d_fieldmask = 0;
259 if (src->dqb_valid & QIF_BLIMITS)
260 dst->d_fieldmask |= QC_SPC_SOFT | QC_SPC_HARD;
261 if (src->dqb_valid & QIF_SPACE)
262 dst->d_fieldmask |= QC_SPACE;
263 if (src->dqb_valid & QIF_ILIMITS)
264 dst->d_fieldmask |= QC_INO_SOFT | QC_INO_HARD;
265 if (src->dqb_valid & QIF_INODES)
266 dst->d_fieldmask |= QC_INO_COUNT;
267 if (src->dqb_valid & QIF_BTIME)
268 dst->d_fieldmask |= QC_SPC_TIMER;
269 if (src->dqb_valid & QIF_ITIME)
270 dst->d_fieldmask |= QC_INO_TIMER;
273 static int quota_setquota(struct super_block *sb, int type, qid_t id,
280 if (copy_from_user(&idq, addr, sizeof(idq)))
282 if (!sb->s_qcop->set_dqblk)
284 qid = make_kqid(current_user_ns(), type, id);
285 if (!qid_has_mapping(sb->s_user_ns, qid))
287 copy_from_if_dqblk(&fdq, &idq);
288 return sb->s_qcop->set_dqblk(sb, qid, &fdq);
291 static int quota_enable(struct super_block *sb, void __user *addr)
295 if (copy_from_user(&flags, addr, sizeof(flags)))
297 if (!sb->s_qcop->quota_enable)
299 return sb->s_qcop->quota_enable(sb, flags);
302 static int quota_disable(struct super_block *sb, void __user *addr)
306 if (copy_from_user(&flags, addr, sizeof(flags)))
308 if (!sb->s_qcop->quota_disable)
310 return sb->s_qcop->quota_disable(sb, flags);
313 static int quota_state_to_flags(struct qc_state *state)
317 if (state->s_state[USRQUOTA].flags & QCI_ACCT_ENABLED)
318 flags |= FS_QUOTA_UDQ_ACCT;
319 if (state->s_state[USRQUOTA].flags & QCI_LIMITS_ENFORCED)
320 flags |= FS_QUOTA_UDQ_ENFD;
321 if (state->s_state[GRPQUOTA].flags & QCI_ACCT_ENABLED)
322 flags |= FS_QUOTA_GDQ_ACCT;
323 if (state->s_state[GRPQUOTA].flags & QCI_LIMITS_ENFORCED)
324 flags |= FS_QUOTA_GDQ_ENFD;
325 if (state->s_state[PRJQUOTA].flags & QCI_ACCT_ENABLED)
326 flags |= FS_QUOTA_PDQ_ACCT;
327 if (state->s_state[PRJQUOTA].flags & QCI_LIMITS_ENFORCED)
328 flags |= FS_QUOTA_PDQ_ENFD;
332 static int quota_getstate(struct super_block *sb, int type,
333 struct fs_quota_stat *fqs)
335 struct qc_state state;
338 memset(&state, 0, sizeof (struct qc_state));
339 ret = sb->s_qcop->get_state(sb, &state);
343 memset(fqs, 0, sizeof(*fqs));
344 fqs->qs_version = FS_QSTAT_VERSION;
345 fqs->qs_flags = quota_state_to_flags(&state);
346 /* No quota enabled? */
349 fqs->qs_incoredqs = state.s_incoredqs;
351 fqs->qs_btimelimit = state.s_state[type].spc_timelimit;
352 fqs->qs_itimelimit = state.s_state[type].ino_timelimit;
353 fqs->qs_rtbtimelimit = state.s_state[type].rt_spc_timelimit;
354 fqs->qs_bwarnlimit = state.s_state[type].spc_warnlimit;
355 fqs->qs_iwarnlimit = state.s_state[type].ino_warnlimit;
357 /* Inodes may be allocated even if inactive; copy out if present */
358 if (state.s_state[USRQUOTA].ino) {
359 fqs->qs_uquota.qfs_ino = state.s_state[USRQUOTA].ino;
360 fqs->qs_uquota.qfs_nblks = state.s_state[USRQUOTA].blocks;
361 fqs->qs_uquota.qfs_nextents = state.s_state[USRQUOTA].nextents;
363 if (state.s_state[GRPQUOTA].ino) {
364 fqs->qs_gquota.qfs_ino = state.s_state[GRPQUOTA].ino;
365 fqs->qs_gquota.qfs_nblks = state.s_state[GRPQUOTA].blocks;
366 fqs->qs_gquota.qfs_nextents = state.s_state[GRPQUOTA].nextents;
368 if (state.s_state[PRJQUOTA].ino) {
370 * Q_XGETQSTAT doesn't have room for both group and project
371 * quotas. So, allow the project quota values to be copied out
372 * only if there is no group quota information available.
374 if (!(state.s_state[GRPQUOTA].flags & QCI_ACCT_ENABLED)) {
375 fqs->qs_gquota.qfs_ino = state.s_state[PRJQUOTA].ino;
376 fqs->qs_gquota.qfs_nblks =
377 state.s_state[PRJQUOTA].blocks;
378 fqs->qs_gquota.qfs_nextents =
379 state.s_state[PRJQUOTA].nextents;
385 static int quota_getxstate(struct super_block *sb, int type, void __user *addr)
387 struct fs_quota_stat fqs;
390 if (!sb->s_qcop->get_state)
392 ret = quota_getstate(sb, type, &fqs);
393 if (!ret && copy_to_user(addr, &fqs, sizeof(fqs)))
398 static int quota_getstatev(struct super_block *sb, int type,
399 struct fs_quota_statv *fqs)
401 struct qc_state state;
404 memset(&state, 0, sizeof (struct qc_state));
405 ret = sb->s_qcop->get_state(sb, &state);
409 memset(fqs, 0, sizeof(*fqs));
410 fqs->qs_version = FS_QSTAT_VERSION;
411 fqs->qs_flags = quota_state_to_flags(&state);
412 /* No quota enabled? */
415 fqs->qs_incoredqs = state.s_incoredqs;
417 fqs->qs_btimelimit = state.s_state[type].spc_timelimit;
418 fqs->qs_itimelimit = state.s_state[type].ino_timelimit;
419 fqs->qs_rtbtimelimit = state.s_state[type].rt_spc_timelimit;
420 fqs->qs_bwarnlimit = state.s_state[type].spc_warnlimit;
421 fqs->qs_iwarnlimit = state.s_state[type].ino_warnlimit;
423 /* Inodes may be allocated even if inactive; copy out if present */
424 if (state.s_state[USRQUOTA].ino) {
425 fqs->qs_uquota.qfs_ino = state.s_state[USRQUOTA].ino;
426 fqs->qs_uquota.qfs_nblks = state.s_state[USRQUOTA].blocks;
427 fqs->qs_uquota.qfs_nextents = state.s_state[USRQUOTA].nextents;
429 if (state.s_state[GRPQUOTA].ino) {
430 fqs->qs_gquota.qfs_ino = state.s_state[GRPQUOTA].ino;
431 fqs->qs_gquota.qfs_nblks = state.s_state[GRPQUOTA].blocks;
432 fqs->qs_gquota.qfs_nextents = state.s_state[GRPQUOTA].nextents;
434 if (state.s_state[PRJQUOTA].ino) {
435 fqs->qs_pquota.qfs_ino = state.s_state[PRJQUOTA].ino;
436 fqs->qs_pquota.qfs_nblks = state.s_state[PRJQUOTA].blocks;
437 fqs->qs_pquota.qfs_nextents = state.s_state[PRJQUOTA].nextents;
442 static int quota_getxstatev(struct super_block *sb, int type, void __user *addr)
444 struct fs_quota_statv fqs;
447 if (!sb->s_qcop->get_state)
450 memset(&fqs, 0, sizeof(fqs));
451 if (copy_from_user(&fqs, addr, 1)) /* Just read qs_version */
454 /* If this kernel doesn't support user specified version, fail */
455 switch (fqs.qs_version) {
456 case FS_QSTATV_VERSION1:
461 ret = quota_getstatev(sb, type, &fqs);
462 if (!ret && copy_to_user(addr, &fqs, sizeof(fqs)))
468 * XFS defines BBTOB and BTOBB macros inside fs/xfs/ and we cannot move them
469 * out of there as xfsprogs rely on definitions being in that header file. So
470 * just define same functions here for quota purposes.
472 #define XFS_BB_SHIFT 9
474 static inline u64 quota_bbtob(u64 blocks)
476 return blocks << XFS_BB_SHIFT;
479 static inline u64 quota_btobb(u64 bytes)
481 return (bytes + (1 << XFS_BB_SHIFT) - 1) >> XFS_BB_SHIFT;
484 static void copy_from_xfs_dqblk(struct qc_dqblk *dst, struct fs_disk_quota *src)
486 dst->d_spc_hardlimit = quota_bbtob(src->d_blk_hardlimit);
487 dst->d_spc_softlimit = quota_bbtob(src->d_blk_softlimit);
488 dst->d_ino_hardlimit = src->d_ino_hardlimit;
489 dst->d_ino_softlimit = src->d_ino_softlimit;
490 dst->d_space = quota_bbtob(src->d_bcount);
491 dst->d_ino_count = src->d_icount;
492 dst->d_ino_timer = src->d_itimer;
493 dst->d_spc_timer = src->d_btimer;
494 dst->d_ino_warns = src->d_iwarns;
495 dst->d_spc_warns = src->d_bwarns;
496 dst->d_rt_spc_hardlimit = quota_bbtob(src->d_rtb_hardlimit);
497 dst->d_rt_spc_softlimit = quota_bbtob(src->d_rtb_softlimit);
498 dst->d_rt_space = quota_bbtob(src->d_rtbcount);
499 dst->d_rt_spc_timer = src->d_rtbtimer;
500 dst->d_rt_spc_warns = src->d_rtbwarns;
501 dst->d_fieldmask = 0;
502 if (src->d_fieldmask & FS_DQ_ISOFT)
503 dst->d_fieldmask |= QC_INO_SOFT;
504 if (src->d_fieldmask & FS_DQ_IHARD)
505 dst->d_fieldmask |= QC_INO_HARD;
506 if (src->d_fieldmask & FS_DQ_BSOFT)
507 dst->d_fieldmask |= QC_SPC_SOFT;
508 if (src->d_fieldmask & FS_DQ_BHARD)
509 dst->d_fieldmask |= QC_SPC_HARD;
510 if (src->d_fieldmask & FS_DQ_RTBSOFT)
511 dst->d_fieldmask |= QC_RT_SPC_SOFT;
512 if (src->d_fieldmask & FS_DQ_RTBHARD)
513 dst->d_fieldmask |= QC_RT_SPC_HARD;
514 if (src->d_fieldmask & FS_DQ_BTIMER)
515 dst->d_fieldmask |= QC_SPC_TIMER;
516 if (src->d_fieldmask & FS_DQ_ITIMER)
517 dst->d_fieldmask |= QC_INO_TIMER;
518 if (src->d_fieldmask & FS_DQ_RTBTIMER)
519 dst->d_fieldmask |= QC_RT_SPC_TIMER;
520 if (src->d_fieldmask & FS_DQ_BWARNS)
521 dst->d_fieldmask |= QC_SPC_WARNS;
522 if (src->d_fieldmask & FS_DQ_IWARNS)
523 dst->d_fieldmask |= QC_INO_WARNS;
524 if (src->d_fieldmask & FS_DQ_RTBWARNS)
525 dst->d_fieldmask |= QC_RT_SPC_WARNS;
526 if (src->d_fieldmask & FS_DQ_BCOUNT)
527 dst->d_fieldmask |= QC_SPACE;
528 if (src->d_fieldmask & FS_DQ_ICOUNT)
529 dst->d_fieldmask |= QC_INO_COUNT;
530 if (src->d_fieldmask & FS_DQ_RTBCOUNT)
531 dst->d_fieldmask |= QC_RT_SPACE;
534 static void copy_qcinfo_from_xfs_dqblk(struct qc_info *dst,
535 struct fs_disk_quota *src)
537 memset(dst, 0, sizeof(*dst));
538 dst->i_spc_timelimit = src->d_btimer;
539 dst->i_ino_timelimit = src->d_itimer;
540 dst->i_rt_spc_timelimit = src->d_rtbtimer;
541 dst->i_ino_warnlimit = src->d_iwarns;
542 dst->i_spc_warnlimit = src->d_bwarns;
543 dst->i_rt_spc_warnlimit = src->d_rtbwarns;
544 if (src->d_fieldmask & FS_DQ_BWARNS)
545 dst->i_fieldmask |= QC_SPC_WARNS;
546 if (src->d_fieldmask & FS_DQ_IWARNS)
547 dst->i_fieldmask |= QC_INO_WARNS;
548 if (src->d_fieldmask & FS_DQ_RTBWARNS)
549 dst->i_fieldmask |= QC_RT_SPC_WARNS;
550 if (src->d_fieldmask & FS_DQ_BTIMER)
551 dst->i_fieldmask |= QC_SPC_TIMER;
552 if (src->d_fieldmask & FS_DQ_ITIMER)
553 dst->i_fieldmask |= QC_INO_TIMER;
554 if (src->d_fieldmask & FS_DQ_RTBTIMER)
555 dst->i_fieldmask |= QC_RT_SPC_TIMER;
558 static int quota_setxquota(struct super_block *sb, int type, qid_t id,
561 struct fs_disk_quota fdq;
565 if (copy_from_user(&fdq, addr, sizeof(fdq)))
567 if (!sb->s_qcop->set_dqblk)
569 qid = make_kqid(current_user_ns(), type, id);
570 if (!qid_has_mapping(sb->s_user_ns, qid))
572 /* Are we actually setting timer / warning limits for all users? */
573 if (from_kqid(sb->s_user_ns, qid) == 0 &&
574 fdq.d_fieldmask & (FS_DQ_WARNS_MASK | FS_DQ_TIMER_MASK)) {
575 struct qc_info qinfo;
578 if (!sb->s_qcop->set_info)
580 copy_qcinfo_from_xfs_dqblk(&qinfo, &fdq);
581 ret = sb->s_qcop->set_info(sb, type, &qinfo);
584 /* These are already done */
585 fdq.d_fieldmask &= ~(FS_DQ_WARNS_MASK | FS_DQ_TIMER_MASK);
587 copy_from_xfs_dqblk(&qdq, &fdq);
588 return sb->s_qcop->set_dqblk(sb, qid, &qdq);
591 static void copy_to_xfs_dqblk(struct fs_disk_quota *dst, struct qc_dqblk *src,
594 memset(dst, 0, sizeof(*dst));
595 dst->d_version = FS_DQUOT_VERSION;
597 if (type == USRQUOTA)
598 dst->d_flags = FS_USER_QUOTA;
599 else if (type == PRJQUOTA)
600 dst->d_flags = FS_PROJ_QUOTA;
602 dst->d_flags = FS_GROUP_QUOTA;
603 dst->d_blk_hardlimit = quota_btobb(src->d_spc_hardlimit);
604 dst->d_blk_softlimit = quota_btobb(src->d_spc_softlimit);
605 dst->d_ino_hardlimit = src->d_ino_hardlimit;
606 dst->d_ino_softlimit = src->d_ino_softlimit;
607 dst->d_bcount = quota_btobb(src->d_space);
608 dst->d_icount = src->d_ino_count;
609 dst->d_itimer = src->d_ino_timer;
610 dst->d_btimer = src->d_spc_timer;
611 dst->d_iwarns = src->d_ino_warns;
612 dst->d_bwarns = src->d_spc_warns;
613 dst->d_rtb_hardlimit = quota_btobb(src->d_rt_spc_hardlimit);
614 dst->d_rtb_softlimit = quota_btobb(src->d_rt_spc_softlimit);
615 dst->d_rtbcount = quota_btobb(src->d_rt_space);
616 dst->d_rtbtimer = src->d_rt_spc_timer;
617 dst->d_rtbwarns = src->d_rt_spc_warns;
620 static int quota_getxquota(struct super_block *sb, int type, qid_t id,
623 struct fs_disk_quota fdq;
628 if (!sb->s_qcop->get_dqblk)
630 qid = make_kqid(current_user_ns(), type, id);
631 if (!qid_has_mapping(sb->s_user_ns, qid))
633 ret = sb->s_qcop->get_dqblk(sb, qid, &qdq);
636 copy_to_xfs_dqblk(&fdq, &qdq, type, id);
637 if (copy_to_user(addr, &fdq, sizeof(fdq)))
643 * Return quota for next active quota >= this id, if any exists,
644 * otherwise return -ENOENT via ->get_nextdqblk.
646 static int quota_getnextxquota(struct super_block *sb, int type, qid_t id,
649 struct fs_disk_quota fdq;
655 if (!sb->s_qcop->get_nextdqblk)
657 qid = make_kqid(current_user_ns(), type, id);
658 if (!qid_has_mapping(sb->s_user_ns, qid))
660 ret = sb->s_qcop->get_nextdqblk(sb, &qid, &qdq);
663 id_out = from_kqid(current_user_ns(), qid);
664 copy_to_xfs_dqblk(&fdq, &qdq, type, id_out);
665 if (copy_to_user(addr, &fdq, sizeof(fdq)))
670 static int quota_rmxquota(struct super_block *sb, void __user *addr)
674 if (copy_from_user(&flags, addr, sizeof(flags)))
676 if (!sb->s_qcop->rm_xquota)
678 return sb->s_qcop->rm_xquota(sb, flags);
681 /* Copy parameters and call proper function */
682 static int do_quotactl(struct super_block *sb, int type, int cmd, qid_t id,
683 void __user *addr, const struct path *path)
687 type = array_index_nospec(type, MAXQUOTAS);
689 * Quota not supported on this fs? Check this before s_quota_types
690 * since they needn't be set if quota is not supported at all.
694 if (!(sb->s_quota_types & (1 << type)))
697 ret = check_quotactl_permission(sb, type, cmd, id);
703 return quota_quotaon(sb, type, id, path);
705 return quota_quotaoff(sb, type);
707 return quota_getfmt(sb, type, addr);
709 return quota_getinfo(sb, type, addr);
711 return quota_setinfo(sb, type, addr);
713 return quota_getquota(sb, type, id, addr);
715 return quota_getnextquota(sb, type, id, addr);
717 return quota_setquota(sb, type, id, addr);
719 if (!sb->s_qcop->quota_sync)
721 return sb->s_qcop->quota_sync(sb, type);
723 return quota_enable(sb, addr);
725 return quota_disable(sb, addr);
727 return quota_rmxquota(sb, addr);
729 return quota_getxstate(sb, type, addr);
731 return quota_getxstatev(sb, type, addr);
733 return quota_setxquota(sb, type, id, addr);
735 return quota_getxquota(sb, type, id, addr);
736 case Q_XGETNEXTQUOTA:
737 return quota_getnextxquota(sb, type, id, addr);
741 /* XFS quotas are fully coherent now, making this call a noop */
750 /* Return 1 if 'cmd' will block on frozen filesystem */
751 static int quotactl_cmd_write(int cmd)
754 * We cannot allow Q_GETQUOTA and Q_GETNEXTQUOTA without write access
755 * as dquot_acquire() may allocate space for new structure and OCFS2
756 * needs to increment on-disk use count.
765 case Q_XGETNEXTQUOTA:
771 #endif /* CONFIG_BLOCK */
773 /* Return true if quotactl command is manipulating quota on/off state */
774 static bool quotactl_cmd_onoff(int cmd)
776 return (cmd == Q_QUOTAON) || (cmd == Q_QUOTAOFF) ||
777 (cmd == Q_XQUOTAON) || (cmd == Q_XQUOTAOFF);
781 * look up a superblock on which quota ops will be performed
782 * - use the name of a block device to find the superblock thereon
784 static struct super_block *quotactl_block(const char __user *special, int cmd)
787 struct block_device *bdev;
788 struct super_block *sb;
789 struct filename *tmp = getname(special);
792 return ERR_CAST(tmp);
793 bdev = lookup_bdev(tmp->name);
796 return ERR_CAST(bdev);
797 if (quotactl_cmd_onoff(cmd))
798 sb = get_super_exclusive_thawed(bdev);
799 else if (quotactl_cmd_write(cmd))
800 sb = get_super_thawed(bdev);
802 sb = get_super(bdev);
805 return ERR_PTR(-ENODEV);
809 return ERR_PTR(-ENODEV);
814 * This is the system call interface. This communicates with
815 * the user-level programs. Currently this only supports diskquota
816 * calls. Maybe we need to add the process quotas etc. in the future,
817 * but we probably should use rlimits for that.
819 int kernel_quotactl(unsigned int cmd, const char __user *special,
820 qid_t id, void __user *addr)
823 struct super_block *sb = NULL;
824 struct path path, *pathp = NULL;
827 cmds = cmd >> SUBCMDSHIFT;
828 type = cmd & SUBCMDMASK;
830 if (type >= MAXQUOTAS)
834 * As a special case Q_SYNC can be called without a specific device.
835 * It will iterate all superblocks that have quota enabled and call
836 * the sync action on each of them.
840 return quota_sync_all(type);
845 * Path for quotaon has to be resolved before grabbing superblock
846 * because that gets s_umount sem which is also possibly needed by path
847 * resolution (think about autofs) and thus deadlocks could arise.
849 if (cmds == Q_QUOTAON) {
850 ret = user_path_at(AT_FDCWD, addr, LOOKUP_FOLLOW|LOOKUP_AUTOMOUNT, &path);
852 pathp = ERR_PTR(ret);
857 sb = quotactl_block(special, cmds);
863 ret = do_quotactl(sb, type, cmds, id, addr, pathp);
865 if (!quotactl_cmd_onoff(cmds))
868 drop_super_exclusive(sb);
870 if (pathp && !IS_ERR(pathp))
875 SYSCALL_DEFINE4(quotactl, unsigned int, cmd, const char __user *, special,
876 qid_t, id, void __user *, addr)
878 return kernel_quotactl(cmd, special, id, addr);