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.
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 #include <linux/nospec.h>
22 static int check_quotactl_permission(struct super_block *sb, int type, int cmd,
26 /* these commands do not require any special privilegues */
34 /* allow to query information for dquots we "own" */
37 if ((type == USRQUOTA && uid_eq(current_euid(), make_kuid(current_user_ns(), id))) ||
38 (type == GRPQUOTA && in_egroup_p(make_kgid(current_user_ns(), id))))
42 if (!capable(CAP_SYS_ADMIN))
46 return security_quotactl(cmd, type, id, sb);
49 static void quota_sync_one(struct super_block *sb, void *arg)
51 int type = *(int *)arg;
53 if (sb->s_qcop && sb->s_qcop->quota_sync &&
54 (sb->s_quota_types & (1 << type)))
55 sb->s_qcop->quota_sync(sb, type);
58 static int quota_sync_all(int type)
62 if (type >= MAXQUOTAS)
64 ret = security_quotactl(Q_SYNC, type, 0, NULL);
66 iterate_supers(quota_sync_one, &type);
70 unsigned int qtype_enforce_flag(int type)
74 return FS_QUOTA_UDQ_ENFD;
76 return FS_QUOTA_GDQ_ENFD;
78 return FS_QUOTA_PDQ_ENFD;
83 static int quota_quotaon(struct super_block *sb, int type, qid_t id,
86 if (!sb->s_qcop->quota_on && !sb->s_qcop->quota_enable)
88 if (sb->s_qcop->quota_enable)
89 return sb->s_qcop->quota_enable(sb, qtype_enforce_flag(type));
92 return sb->s_qcop->quota_on(sb, type, id, path);
95 static int quota_quotaoff(struct super_block *sb, int type)
97 if (!sb->s_qcop->quota_off && !sb->s_qcop->quota_disable)
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);
104 static int quota_getfmt(struct super_block *sb, int type, void __user *addr)
108 mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
109 if (!sb_has_quota_active(sb, type)) {
110 mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
113 fmt = sb_dqopt(sb)->info[type].dqi_format->qf_fmt_id;
114 mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
115 if (copy_to_user(addr, &fmt, sizeof(fmt)))
120 static int quota_getinfo(struct super_block *sb, int type, void __user *addr)
122 struct qc_state state;
123 struct qc_type_state *tstate;
124 struct if_dqinfo uinfo;
127 /* This checks whether qc_state has enough entries... */
128 BUILD_BUG_ON(MAXQUOTAS > XQM_MAXQUOTAS);
129 if (!sb->s_qcop->get_state)
131 ret = sb->s_qcop->get_state(sb, &state);
134 tstate = state.s_state + type;
135 if (!(tstate->flags & QCI_ACCT_ENABLED))
137 memset(&uinfo, 0, sizeof(uinfo));
138 uinfo.dqi_bgrace = tstate->spc_timelimit;
139 uinfo.dqi_igrace = tstate->ino_timelimit;
140 if (tstate->flags & QCI_SYSFILE)
141 uinfo.dqi_flags |= DQF_SYS_FILE;
142 if (tstate->flags & QCI_ROOT_SQUASH)
143 uinfo.dqi_flags |= DQF_ROOT_SQUASH;
144 uinfo.dqi_valid = IIF_ALL;
145 if (copy_to_user(addr, &uinfo, sizeof(uinfo)))
150 static int quota_setinfo(struct super_block *sb, int type, void __user *addr)
152 struct if_dqinfo info;
153 struct qc_info qinfo;
155 if (copy_from_user(&info, addr, sizeof(info)))
157 if (!sb->s_qcop->set_info)
159 if (info.dqi_valid & ~(IIF_FLAGS | IIF_BGRACE | IIF_IGRACE))
161 memset(&qinfo, 0, sizeof(qinfo));
162 if (info.dqi_valid & IIF_FLAGS) {
163 if (info.dqi_flags & ~DQF_SETINFO_MASK)
165 if (info.dqi_flags & DQF_ROOT_SQUASH)
166 qinfo.i_flags |= QCI_ROOT_SQUASH;
167 qinfo.i_fieldmask |= QC_FLAGS;
169 if (info.dqi_valid & IIF_BGRACE) {
170 qinfo.i_spc_timelimit = info.dqi_bgrace;
171 qinfo.i_fieldmask |= QC_SPC_TIMER;
173 if (info.dqi_valid & IIF_IGRACE) {
174 qinfo.i_ino_timelimit = info.dqi_igrace;
175 qinfo.i_fieldmask |= QC_INO_TIMER;
177 return sb->s_qcop->set_info(sb, type, &qinfo);
180 static inline qsize_t qbtos(qsize_t blocks)
182 return blocks << QIF_DQBLKSIZE_BITS;
185 static inline qsize_t stoqb(qsize_t space)
187 return (space + QIF_DQBLKSIZE - 1) >> QIF_DQBLKSIZE_BITS;
190 static void copy_to_if_dqblk(struct if_dqblk *dst, struct qc_dqblk *src)
192 memset(dst, 0, sizeof(*dst));
193 dst->dqb_bhardlimit = stoqb(src->d_spc_hardlimit);
194 dst->dqb_bsoftlimit = stoqb(src->d_spc_softlimit);
195 dst->dqb_curspace = src->d_space;
196 dst->dqb_ihardlimit = src->d_ino_hardlimit;
197 dst->dqb_isoftlimit = src->d_ino_softlimit;
198 dst->dqb_curinodes = src->d_ino_count;
199 dst->dqb_btime = src->d_spc_timer;
200 dst->dqb_itime = src->d_ino_timer;
201 dst->dqb_valid = QIF_ALL;
204 static int quota_getquota(struct super_block *sb, int type, qid_t id,
212 if (!sb->s_qcop->get_dqblk)
214 qid = make_kqid(current_user_ns(), type, id);
215 if (!qid_has_mapping(sb->s_user_ns, qid))
217 ret = sb->s_qcop->get_dqblk(sb, qid, &fdq);
220 copy_to_if_dqblk(&idq, &fdq);
221 if (copy_to_user(addr, &idq, sizeof(idq)))
227 * Return quota for next active quota >= this id, if any exists,
228 * otherwise return -ENOENT via ->get_nextdqblk
230 static int quota_getnextquota(struct super_block *sb, int type, qid_t id,
235 struct if_nextdqblk idq;
238 if (!sb->s_qcop->get_nextdqblk)
240 qid = make_kqid(current_user_ns(), type, id);
241 if (!qid_has_mapping(sb->s_user_ns, qid))
243 ret = sb->s_qcop->get_nextdqblk(sb, &qid, &fdq);
246 /* struct if_nextdqblk is a superset of struct if_dqblk */
247 copy_to_if_dqblk((struct if_dqblk *)&idq, &fdq);
248 idq.dqb_id = from_kqid(current_user_ns(), qid);
249 if (copy_to_user(addr, &idq, sizeof(idq)))
254 static void copy_from_if_dqblk(struct qc_dqblk *dst, struct if_dqblk *src)
256 dst->d_spc_hardlimit = qbtos(src->dqb_bhardlimit);
257 dst->d_spc_softlimit = qbtos(src->dqb_bsoftlimit);
258 dst->d_space = src->dqb_curspace;
259 dst->d_ino_hardlimit = src->dqb_ihardlimit;
260 dst->d_ino_softlimit = src->dqb_isoftlimit;
261 dst->d_ino_count = src->dqb_curinodes;
262 dst->d_spc_timer = src->dqb_btime;
263 dst->d_ino_timer = src->dqb_itime;
265 dst->d_fieldmask = 0;
266 if (src->dqb_valid & QIF_BLIMITS)
267 dst->d_fieldmask |= QC_SPC_SOFT | QC_SPC_HARD;
268 if (src->dqb_valid & QIF_SPACE)
269 dst->d_fieldmask |= QC_SPACE;
270 if (src->dqb_valid & QIF_ILIMITS)
271 dst->d_fieldmask |= QC_INO_SOFT | QC_INO_HARD;
272 if (src->dqb_valid & QIF_INODES)
273 dst->d_fieldmask |= QC_INO_COUNT;
274 if (src->dqb_valid & QIF_BTIME)
275 dst->d_fieldmask |= QC_SPC_TIMER;
276 if (src->dqb_valid & QIF_ITIME)
277 dst->d_fieldmask |= QC_INO_TIMER;
280 static int quota_setquota(struct super_block *sb, int type, qid_t id,
287 if (copy_from_user(&idq, addr, sizeof(idq)))
289 if (!sb->s_qcop->set_dqblk)
291 qid = make_kqid(current_user_ns(), type, id);
292 if (!qid_has_mapping(sb->s_user_ns, qid))
294 copy_from_if_dqblk(&fdq, &idq);
295 return sb->s_qcop->set_dqblk(sb, qid, &fdq);
298 static int quota_enable(struct super_block *sb, void __user *addr)
302 if (copy_from_user(&flags, addr, sizeof(flags)))
304 if (!sb->s_qcop->quota_enable)
306 return sb->s_qcop->quota_enable(sb, flags);
309 static int quota_disable(struct super_block *sb, void __user *addr)
313 if (copy_from_user(&flags, addr, sizeof(flags)))
315 if (!sb->s_qcop->quota_disable)
317 return sb->s_qcop->quota_disable(sb, flags);
320 static int quota_state_to_flags(struct qc_state *state)
324 if (state->s_state[USRQUOTA].flags & QCI_ACCT_ENABLED)
325 flags |= FS_QUOTA_UDQ_ACCT;
326 if (state->s_state[USRQUOTA].flags & QCI_LIMITS_ENFORCED)
327 flags |= FS_QUOTA_UDQ_ENFD;
328 if (state->s_state[GRPQUOTA].flags & QCI_ACCT_ENABLED)
329 flags |= FS_QUOTA_GDQ_ACCT;
330 if (state->s_state[GRPQUOTA].flags & QCI_LIMITS_ENFORCED)
331 flags |= FS_QUOTA_GDQ_ENFD;
332 if (state->s_state[PRJQUOTA].flags & QCI_ACCT_ENABLED)
333 flags |= FS_QUOTA_PDQ_ACCT;
334 if (state->s_state[PRJQUOTA].flags & QCI_LIMITS_ENFORCED)
335 flags |= FS_QUOTA_PDQ_ENFD;
339 static int quota_getstate(struct super_block *sb, struct fs_quota_stat *fqs)
342 struct qc_state state;
345 memset(&state, 0, sizeof (struct qc_state));
346 ret = sb->s_qcop->get_state(sb, &state);
350 memset(fqs, 0, sizeof(*fqs));
351 fqs->qs_version = FS_QSTAT_VERSION;
352 fqs->qs_flags = quota_state_to_flags(&state);
353 /* No quota enabled? */
356 fqs->qs_incoredqs = state.s_incoredqs;
358 * GETXSTATE quotactl has space for just one set of time limits so
359 * report them for the first enabled quota type
361 for (type = 0; type < XQM_MAXQUOTAS; type++)
362 if (state.s_state[type].flags & QCI_ACCT_ENABLED)
364 BUG_ON(type == XQM_MAXQUOTAS);
365 fqs->qs_btimelimit = state.s_state[type].spc_timelimit;
366 fqs->qs_itimelimit = state.s_state[type].ino_timelimit;
367 fqs->qs_rtbtimelimit = state.s_state[type].rt_spc_timelimit;
368 fqs->qs_bwarnlimit = state.s_state[type].spc_warnlimit;
369 fqs->qs_iwarnlimit = state.s_state[type].ino_warnlimit;
371 /* Inodes may be allocated even if inactive; copy out if present */
372 if (state.s_state[USRQUOTA].ino) {
373 fqs->qs_uquota.qfs_ino = state.s_state[USRQUOTA].ino;
374 fqs->qs_uquota.qfs_nblks = state.s_state[USRQUOTA].blocks;
375 fqs->qs_uquota.qfs_nextents = state.s_state[USRQUOTA].nextents;
377 if (state.s_state[GRPQUOTA].ino) {
378 fqs->qs_gquota.qfs_ino = state.s_state[GRPQUOTA].ino;
379 fqs->qs_gquota.qfs_nblks = state.s_state[GRPQUOTA].blocks;
380 fqs->qs_gquota.qfs_nextents = state.s_state[GRPQUOTA].nextents;
382 if (state.s_state[PRJQUOTA].ino) {
384 * Q_XGETQSTAT doesn't have room for both group and project
385 * quotas. So, allow the project quota values to be copied out
386 * only if there is no group quota information available.
388 if (!(state.s_state[GRPQUOTA].flags & QCI_ACCT_ENABLED)) {
389 fqs->qs_gquota.qfs_ino = state.s_state[PRJQUOTA].ino;
390 fqs->qs_gquota.qfs_nblks =
391 state.s_state[PRJQUOTA].blocks;
392 fqs->qs_gquota.qfs_nextents =
393 state.s_state[PRJQUOTA].nextents;
399 static int quota_getxstate(struct super_block *sb, void __user *addr)
401 struct fs_quota_stat fqs;
404 if (!sb->s_qcop->get_state)
406 ret = quota_getstate(sb, &fqs);
407 if (!ret && copy_to_user(addr, &fqs, sizeof(fqs)))
412 static int quota_getstatev(struct super_block *sb, struct fs_quota_statv *fqs)
415 struct qc_state state;
418 memset(&state, 0, sizeof (struct qc_state));
419 ret = sb->s_qcop->get_state(sb, &state);
423 memset(fqs, 0, sizeof(*fqs));
424 fqs->qs_version = FS_QSTAT_VERSION;
425 fqs->qs_flags = quota_state_to_flags(&state);
426 /* No quota enabled? */
429 fqs->qs_incoredqs = state.s_incoredqs;
431 * GETXSTATV quotactl has space for just one set of time limits so
432 * report them for the first enabled quota type
434 for (type = 0; type < XQM_MAXQUOTAS; type++)
435 if (state.s_state[type].flags & QCI_ACCT_ENABLED)
437 BUG_ON(type == XQM_MAXQUOTAS);
438 fqs->qs_btimelimit = state.s_state[type].spc_timelimit;
439 fqs->qs_itimelimit = state.s_state[type].ino_timelimit;
440 fqs->qs_rtbtimelimit = state.s_state[type].rt_spc_timelimit;
441 fqs->qs_bwarnlimit = state.s_state[type].spc_warnlimit;
442 fqs->qs_iwarnlimit = state.s_state[type].ino_warnlimit;
444 /* Inodes may be allocated even if inactive; copy out if present */
445 if (state.s_state[USRQUOTA].ino) {
446 fqs->qs_uquota.qfs_ino = state.s_state[USRQUOTA].ino;
447 fqs->qs_uquota.qfs_nblks = state.s_state[USRQUOTA].blocks;
448 fqs->qs_uquota.qfs_nextents = state.s_state[USRQUOTA].nextents;
450 if (state.s_state[GRPQUOTA].ino) {
451 fqs->qs_gquota.qfs_ino = state.s_state[GRPQUOTA].ino;
452 fqs->qs_gquota.qfs_nblks = state.s_state[GRPQUOTA].blocks;
453 fqs->qs_gquota.qfs_nextents = state.s_state[GRPQUOTA].nextents;
455 if (state.s_state[PRJQUOTA].ino) {
456 fqs->qs_pquota.qfs_ino = state.s_state[PRJQUOTA].ino;
457 fqs->qs_pquota.qfs_nblks = state.s_state[PRJQUOTA].blocks;
458 fqs->qs_pquota.qfs_nextents = state.s_state[PRJQUOTA].nextents;
463 static int quota_getxstatev(struct super_block *sb, void __user *addr)
465 struct fs_quota_statv fqs;
468 if (!sb->s_qcop->get_state)
471 memset(&fqs, 0, sizeof(fqs));
472 if (copy_from_user(&fqs, addr, 1)) /* Just read qs_version */
475 /* If this kernel doesn't support user specified version, fail */
476 switch (fqs.qs_version) {
477 case FS_QSTATV_VERSION1:
482 ret = quota_getstatev(sb, &fqs);
483 if (!ret && copy_to_user(addr, &fqs, sizeof(fqs)))
489 * XFS defines BBTOB and BTOBB macros inside fs/xfs/ and we cannot move them
490 * out of there as xfsprogs rely on definitions being in that header file. So
491 * just define same functions here for quota purposes.
493 #define XFS_BB_SHIFT 9
495 static inline u64 quota_bbtob(u64 blocks)
497 return blocks << XFS_BB_SHIFT;
500 static inline u64 quota_btobb(u64 bytes)
502 return (bytes + (1 << XFS_BB_SHIFT) - 1) >> XFS_BB_SHIFT;
505 static void copy_from_xfs_dqblk(struct qc_dqblk *dst, struct fs_disk_quota *src)
507 dst->d_spc_hardlimit = quota_bbtob(src->d_blk_hardlimit);
508 dst->d_spc_softlimit = quota_bbtob(src->d_blk_softlimit);
509 dst->d_ino_hardlimit = src->d_ino_hardlimit;
510 dst->d_ino_softlimit = src->d_ino_softlimit;
511 dst->d_space = quota_bbtob(src->d_bcount);
512 dst->d_ino_count = src->d_icount;
513 dst->d_ino_timer = src->d_itimer;
514 dst->d_spc_timer = src->d_btimer;
515 dst->d_ino_warns = src->d_iwarns;
516 dst->d_spc_warns = src->d_bwarns;
517 dst->d_rt_spc_hardlimit = quota_bbtob(src->d_rtb_hardlimit);
518 dst->d_rt_spc_softlimit = quota_bbtob(src->d_rtb_softlimit);
519 dst->d_rt_space = quota_bbtob(src->d_rtbcount);
520 dst->d_rt_spc_timer = src->d_rtbtimer;
521 dst->d_rt_spc_warns = src->d_rtbwarns;
522 dst->d_fieldmask = 0;
523 if (src->d_fieldmask & FS_DQ_ISOFT)
524 dst->d_fieldmask |= QC_INO_SOFT;
525 if (src->d_fieldmask & FS_DQ_IHARD)
526 dst->d_fieldmask |= QC_INO_HARD;
527 if (src->d_fieldmask & FS_DQ_BSOFT)
528 dst->d_fieldmask |= QC_SPC_SOFT;
529 if (src->d_fieldmask & FS_DQ_BHARD)
530 dst->d_fieldmask |= QC_SPC_HARD;
531 if (src->d_fieldmask & FS_DQ_RTBSOFT)
532 dst->d_fieldmask |= QC_RT_SPC_SOFT;
533 if (src->d_fieldmask & FS_DQ_RTBHARD)
534 dst->d_fieldmask |= QC_RT_SPC_HARD;
535 if (src->d_fieldmask & FS_DQ_BTIMER)
536 dst->d_fieldmask |= QC_SPC_TIMER;
537 if (src->d_fieldmask & FS_DQ_ITIMER)
538 dst->d_fieldmask |= QC_INO_TIMER;
539 if (src->d_fieldmask & FS_DQ_RTBTIMER)
540 dst->d_fieldmask |= QC_RT_SPC_TIMER;
541 if (src->d_fieldmask & FS_DQ_BWARNS)
542 dst->d_fieldmask |= QC_SPC_WARNS;
543 if (src->d_fieldmask & FS_DQ_IWARNS)
544 dst->d_fieldmask |= QC_INO_WARNS;
545 if (src->d_fieldmask & FS_DQ_RTBWARNS)
546 dst->d_fieldmask |= QC_RT_SPC_WARNS;
547 if (src->d_fieldmask & FS_DQ_BCOUNT)
548 dst->d_fieldmask |= QC_SPACE;
549 if (src->d_fieldmask & FS_DQ_ICOUNT)
550 dst->d_fieldmask |= QC_INO_COUNT;
551 if (src->d_fieldmask & FS_DQ_RTBCOUNT)
552 dst->d_fieldmask |= QC_RT_SPACE;
555 static void copy_qcinfo_from_xfs_dqblk(struct qc_info *dst,
556 struct fs_disk_quota *src)
558 memset(dst, 0, sizeof(*dst));
559 dst->i_spc_timelimit = src->d_btimer;
560 dst->i_ino_timelimit = src->d_itimer;
561 dst->i_rt_spc_timelimit = src->d_rtbtimer;
562 dst->i_ino_warnlimit = src->d_iwarns;
563 dst->i_spc_warnlimit = src->d_bwarns;
564 dst->i_rt_spc_warnlimit = src->d_rtbwarns;
565 if (src->d_fieldmask & FS_DQ_BWARNS)
566 dst->i_fieldmask |= QC_SPC_WARNS;
567 if (src->d_fieldmask & FS_DQ_IWARNS)
568 dst->i_fieldmask |= QC_INO_WARNS;
569 if (src->d_fieldmask & FS_DQ_RTBWARNS)
570 dst->i_fieldmask |= QC_RT_SPC_WARNS;
571 if (src->d_fieldmask & FS_DQ_BTIMER)
572 dst->i_fieldmask |= QC_SPC_TIMER;
573 if (src->d_fieldmask & FS_DQ_ITIMER)
574 dst->i_fieldmask |= QC_INO_TIMER;
575 if (src->d_fieldmask & FS_DQ_RTBTIMER)
576 dst->i_fieldmask |= QC_RT_SPC_TIMER;
579 static int quota_setxquota(struct super_block *sb, int type, qid_t id,
582 struct fs_disk_quota fdq;
586 if (copy_from_user(&fdq, addr, sizeof(fdq)))
588 if (!sb->s_qcop->set_dqblk)
590 qid = make_kqid(current_user_ns(), type, id);
591 if (!qid_has_mapping(sb->s_user_ns, qid))
593 /* Are we actually setting timer / warning limits for all users? */
594 if (from_kqid(sb->s_user_ns, qid) == 0 &&
595 fdq.d_fieldmask & (FS_DQ_WARNS_MASK | FS_DQ_TIMER_MASK)) {
596 struct qc_info qinfo;
599 if (!sb->s_qcop->set_info)
601 copy_qcinfo_from_xfs_dqblk(&qinfo, &fdq);
602 ret = sb->s_qcop->set_info(sb, type, &qinfo);
605 /* These are already done */
606 fdq.d_fieldmask &= ~(FS_DQ_WARNS_MASK | FS_DQ_TIMER_MASK);
608 copy_from_xfs_dqblk(&qdq, &fdq);
609 return sb->s_qcop->set_dqblk(sb, qid, &qdq);
612 static void copy_to_xfs_dqblk(struct fs_disk_quota *dst, struct qc_dqblk *src,
615 memset(dst, 0, sizeof(*dst));
616 dst->d_version = FS_DQUOT_VERSION;
618 if (type == USRQUOTA)
619 dst->d_flags = FS_USER_QUOTA;
620 else if (type == PRJQUOTA)
621 dst->d_flags = FS_PROJ_QUOTA;
623 dst->d_flags = FS_GROUP_QUOTA;
624 dst->d_blk_hardlimit = quota_btobb(src->d_spc_hardlimit);
625 dst->d_blk_softlimit = quota_btobb(src->d_spc_softlimit);
626 dst->d_ino_hardlimit = src->d_ino_hardlimit;
627 dst->d_ino_softlimit = src->d_ino_softlimit;
628 dst->d_bcount = quota_btobb(src->d_space);
629 dst->d_icount = src->d_ino_count;
630 dst->d_itimer = src->d_ino_timer;
631 dst->d_btimer = src->d_spc_timer;
632 dst->d_iwarns = src->d_ino_warns;
633 dst->d_bwarns = src->d_spc_warns;
634 dst->d_rtb_hardlimit = quota_btobb(src->d_rt_spc_hardlimit);
635 dst->d_rtb_softlimit = quota_btobb(src->d_rt_spc_softlimit);
636 dst->d_rtbcount = quota_btobb(src->d_rt_space);
637 dst->d_rtbtimer = src->d_rt_spc_timer;
638 dst->d_rtbwarns = src->d_rt_spc_warns;
641 static int quota_getxquota(struct super_block *sb, int type, qid_t id,
644 struct fs_disk_quota fdq;
649 if (!sb->s_qcop->get_dqblk)
651 qid = make_kqid(current_user_ns(), type, id);
652 if (!qid_has_mapping(sb->s_user_ns, qid))
654 ret = sb->s_qcop->get_dqblk(sb, qid, &qdq);
657 copy_to_xfs_dqblk(&fdq, &qdq, type, id);
658 if (copy_to_user(addr, &fdq, sizeof(fdq)))
664 * Return quota for next active quota >= this id, if any exists,
665 * otherwise return -ENOENT via ->get_nextdqblk.
667 static int quota_getnextxquota(struct super_block *sb, int type, qid_t id,
670 struct fs_disk_quota fdq;
676 if (!sb->s_qcop->get_nextdqblk)
678 qid = make_kqid(current_user_ns(), type, id);
679 if (!qid_has_mapping(sb->s_user_ns, qid))
681 ret = sb->s_qcop->get_nextdqblk(sb, &qid, &qdq);
684 id_out = from_kqid(current_user_ns(), qid);
685 copy_to_xfs_dqblk(&fdq, &qdq, type, id_out);
686 if (copy_to_user(addr, &fdq, sizeof(fdq)))
691 static int quota_rmxquota(struct super_block *sb, void __user *addr)
695 if (copy_from_user(&flags, addr, sizeof(flags)))
697 if (!sb->s_qcop->rm_xquota)
699 return sb->s_qcop->rm_xquota(sb, flags);
702 /* Copy parameters and call proper function */
703 static int do_quotactl(struct super_block *sb, int type, int cmd, qid_t id,
704 void __user *addr, struct path *path)
708 if (type >= (XQM_COMMAND(cmd) ? XQM_MAXQUOTAS : MAXQUOTAS))
710 type = array_index_nospec(type, MAXQUOTAS);
712 * Quota not supported on this fs? Check this before s_quota_types
713 * since they needn't be set if quota is not supported at all.
717 if (!(sb->s_quota_types & (1 << type)))
720 ret = check_quotactl_permission(sb, type, cmd, id);
726 return quota_quotaon(sb, type, id, path);
728 return quota_quotaoff(sb, type);
730 return quota_getfmt(sb, type, addr);
732 return quota_getinfo(sb, type, addr);
734 return quota_setinfo(sb, type, addr);
736 return quota_getquota(sb, type, id, addr);
738 return quota_getnextquota(sb, type, id, addr);
740 return quota_setquota(sb, type, id, addr);
742 if (!sb->s_qcop->quota_sync)
744 return sb->s_qcop->quota_sync(sb, type);
746 return quota_enable(sb, addr);
748 return quota_disable(sb, addr);
750 return quota_rmxquota(sb, addr);
752 return quota_getxstate(sb, addr);
754 return quota_getxstatev(sb, addr);
756 return quota_setxquota(sb, type, id, addr);
758 return quota_getxquota(sb, type, id, addr);
759 case Q_XGETNEXTQUOTA:
760 return quota_getnextxquota(sb, type, id, addr);
762 if (sb->s_flags & MS_RDONLY)
764 /* XFS quotas are fully coherent now, making this call a noop */
773 /* Return 1 if 'cmd' will block on frozen filesystem */
774 static int quotactl_cmd_write(int cmd)
777 * We cannot allow Q_GETQUOTA and Q_GETNEXTQUOTA without write access
778 * as dquot_acquire() may allocate space for new structure and OCFS2
779 * needs to increment on-disk use count.
788 case Q_XGETNEXTQUOTA:
795 #endif /* CONFIG_BLOCK */
798 * look up a superblock on which quota ops will be performed
799 * - use the name of a block device to find the superblock thereon
801 static struct super_block *quotactl_block(const char __user *special, int cmd)
804 struct block_device *bdev;
805 struct super_block *sb;
806 struct filename *tmp = getname(special);
809 return ERR_CAST(tmp);
810 bdev = lookup_bdev(tmp->name);
813 return ERR_CAST(bdev);
814 if (quotactl_cmd_write(cmd))
815 sb = get_super_thawed(bdev);
817 sb = get_super(bdev);
820 return ERR_PTR(-ENODEV);
824 return ERR_PTR(-ENODEV);
829 * This is the system call interface. This communicates with
830 * the user-level programs. Currently this only supports diskquota
831 * calls. Maybe we need to add the process quotas etc. in the future,
832 * but we probably should use rlimits for that.
834 SYSCALL_DEFINE4(quotactl, unsigned int, cmd, const char __user *, special,
835 qid_t, id, void __user *, addr)
838 struct super_block *sb = NULL;
839 struct path path, *pathp = NULL;
842 cmds = cmd >> SUBCMDSHIFT;
843 type = cmd & SUBCMDMASK;
846 * As a special case Q_SYNC can be called without a specific device.
847 * It will iterate all superblocks that have quota enabled and call
848 * the sync action on each of them.
852 return quota_sync_all(type);
857 * Path for quotaon has to be resolved before grabbing superblock
858 * because that gets s_umount sem which is also possibly needed by path
859 * resolution (think about autofs) and thus deadlocks could arise.
861 if (cmds == Q_QUOTAON) {
862 ret = user_path_at(AT_FDCWD, addr, LOOKUP_FOLLOW|LOOKUP_AUTOMOUNT, &path);
864 pathp = ERR_PTR(ret);
869 sb = quotactl_block(special, cmds);
875 ret = do_quotactl(sb, type, cmds, id, addr, pathp);
879 if (pathp && !IS_ERR(pathp))