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>
21 static int check_quotactl_permission(struct super_block *sb, int type, int cmd,
25 /* these commands do not require any special privilegues */
33 /* allow to query information for dquots we "own" */
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))))
41 if (!capable(CAP_SYS_ADMIN))
45 return security_quotactl(cmd, type, id, sb);
48 static void quota_sync_one(struct super_block *sb, void *arg)
50 int type = *(int *)arg;
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);
57 static int quota_sync_all(int type)
61 if (type >= MAXQUOTAS)
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,
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 mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
108 if (!sb_has_quota_active(sb, type)) {
109 mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
112 fmt = sb_dqopt(sb)->info[type].dqi_format->qf_fmt_id;
113 mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
114 if (copy_to_user(addr, &fmt, sizeof(fmt)))
119 static int quota_getinfo(struct super_block *sb, int type, void __user *addr)
121 struct qc_state state;
122 struct qc_type_state *tstate;
123 struct if_dqinfo uinfo;
126 /* This checks whether qc_state has enough entries... */
127 BUILD_BUG_ON(MAXQUOTAS > XQM_MAXQUOTAS);
128 if (!sb->s_qcop->get_state)
130 ret = sb->s_qcop->get_state(sb, &state);
133 tstate = state.s_state + type;
134 if (!(tstate->flags & QCI_ACCT_ENABLED))
136 memset(&uinfo, 0, sizeof(uinfo));
137 uinfo.dqi_bgrace = tstate->spc_timelimit;
138 uinfo.dqi_igrace = tstate->ino_timelimit;
139 if (tstate->flags & QCI_SYSFILE)
140 uinfo.dqi_flags |= DQF_SYS_FILE;
141 if (tstate->flags & QCI_ROOT_SQUASH)
142 uinfo.dqi_flags |= DQF_ROOT_SQUASH;
143 uinfo.dqi_valid = IIF_ALL;
144 if (copy_to_user(addr, &uinfo, sizeof(uinfo)))
149 static int quota_setinfo(struct super_block *sb, int type, void __user *addr)
151 struct if_dqinfo info;
152 struct qc_info qinfo;
154 if (copy_from_user(&info, addr, sizeof(info)))
156 if (!sb->s_qcop->set_info)
158 if (info.dqi_valid & ~(IIF_FLAGS | IIF_BGRACE | IIF_IGRACE))
160 memset(&qinfo, 0, sizeof(qinfo));
161 if (info.dqi_valid & IIF_FLAGS) {
162 if (info.dqi_flags & ~DQF_SETINFO_MASK)
164 if (info.dqi_flags & DQF_ROOT_SQUASH)
165 qinfo.i_flags |= QCI_ROOT_SQUASH;
166 qinfo.i_fieldmask |= QC_FLAGS;
168 if (info.dqi_valid & IIF_BGRACE) {
169 qinfo.i_spc_timelimit = info.dqi_bgrace;
170 qinfo.i_fieldmask |= QC_SPC_TIMER;
172 if (info.dqi_valid & IIF_IGRACE) {
173 qinfo.i_ino_timelimit = info.dqi_igrace;
174 qinfo.i_fieldmask |= QC_INO_TIMER;
176 return sb->s_qcop->set_info(sb, type, &qinfo);
179 static inline qsize_t qbtos(qsize_t blocks)
181 return blocks << QIF_DQBLKSIZE_BITS;
184 static inline qsize_t stoqb(qsize_t space)
186 return (space + QIF_DQBLKSIZE - 1) >> QIF_DQBLKSIZE_BITS;
189 static void copy_to_if_dqblk(struct if_dqblk *dst, struct qc_dqblk *src)
191 memset(dst, 0, sizeof(*dst));
192 dst->dqb_bhardlimit = stoqb(src->d_spc_hardlimit);
193 dst->dqb_bsoftlimit = stoqb(src->d_spc_softlimit);
194 dst->dqb_curspace = src->d_space;
195 dst->dqb_ihardlimit = src->d_ino_hardlimit;
196 dst->dqb_isoftlimit = src->d_ino_softlimit;
197 dst->dqb_curinodes = src->d_ino_count;
198 dst->dqb_btime = src->d_spc_timer;
199 dst->dqb_itime = src->d_ino_timer;
200 dst->dqb_valid = QIF_ALL;
203 static int quota_getquota(struct super_block *sb, int type, qid_t id,
211 if (!sb->s_qcop->get_dqblk)
213 qid = make_kqid(current_user_ns(), type, id);
214 if (!qid_has_mapping(sb->s_user_ns, qid))
216 ret = sb->s_qcop->get_dqblk(sb, qid, &fdq);
219 copy_to_if_dqblk(&idq, &fdq);
220 if (copy_to_user(addr, &idq, sizeof(idq)))
226 * Return quota for next active quota >= this id, if any exists,
227 * otherwise return -ENOENT via ->get_nextdqblk
229 static int quota_getnextquota(struct super_block *sb, int type, qid_t id,
234 struct if_nextdqblk idq;
237 if (!sb->s_qcop->get_nextdqblk)
239 qid = make_kqid(current_user_ns(), type, id);
240 if (!qid_has_mapping(sb->s_user_ns, qid))
242 ret = sb->s_qcop->get_nextdqblk(sb, &qid, &fdq);
245 /* struct if_nextdqblk is a superset of struct if_dqblk */
246 copy_to_if_dqblk((struct if_dqblk *)&idq, &fdq);
247 idq.dqb_id = from_kqid(current_user_ns(), qid);
248 if (copy_to_user(addr, &idq, sizeof(idq)))
253 static void copy_from_if_dqblk(struct qc_dqblk *dst, struct if_dqblk *src)
255 dst->d_spc_hardlimit = qbtos(src->dqb_bhardlimit);
256 dst->d_spc_softlimit = qbtos(src->dqb_bsoftlimit);
257 dst->d_space = src->dqb_curspace;
258 dst->d_ino_hardlimit = src->dqb_ihardlimit;
259 dst->d_ino_softlimit = src->dqb_isoftlimit;
260 dst->d_ino_count = src->dqb_curinodes;
261 dst->d_spc_timer = src->dqb_btime;
262 dst->d_ino_timer = src->dqb_itime;
264 dst->d_fieldmask = 0;
265 if (src->dqb_valid & QIF_BLIMITS)
266 dst->d_fieldmask |= QC_SPC_SOFT | QC_SPC_HARD;
267 if (src->dqb_valid & QIF_SPACE)
268 dst->d_fieldmask |= QC_SPACE;
269 if (src->dqb_valid & QIF_ILIMITS)
270 dst->d_fieldmask |= QC_INO_SOFT | QC_INO_HARD;
271 if (src->dqb_valid & QIF_INODES)
272 dst->d_fieldmask |= QC_INO_COUNT;
273 if (src->dqb_valid & QIF_BTIME)
274 dst->d_fieldmask |= QC_SPC_TIMER;
275 if (src->dqb_valid & QIF_ITIME)
276 dst->d_fieldmask |= QC_INO_TIMER;
279 static int quota_setquota(struct super_block *sb, int type, qid_t id,
286 if (copy_from_user(&idq, addr, sizeof(idq)))
288 if (!sb->s_qcop->set_dqblk)
290 qid = make_kqid(current_user_ns(), type, id);
291 if (!qid_has_mapping(sb->s_user_ns, qid))
293 copy_from_if_dqblk(&fdq, &idq);
294 return sb->s_qcop->set_dqblk(sb, qid, &fdq);
297 static int quota_enable(struct super_block *sb, void __user *addr)
301 if (copy_from_user(&flags, addr, sizeof(flags)))
303 if (!sb->s_qcop->quota_enable)
305 return sb->s_qcop->quota_enable(sb, flags);
308 static int quota_disable(struct super_block *sb, void __user *addr)
312 if (copy_from_user(&flags, addr, sizeof(flags)))
314 if (!sb->s_qcop->quota_disable)
316 return sb->s_qcop->quota_disable(sb, flags);
319 static int quota_state_to_flags(struct qc_state *state)
323 if (state->s_state[USRQUOTA].flags & QCI_ACCT_ENABLED)
324 flags |= FS_QUOTA_UDQ_ACCT;
325 if (state->s_state[USRQUOTA].flags & QCI_LIMITS_ENFORCED)
326 flags |= FS_QUOTA_UDQ_ENFD;
327 if (state->s_state[GRPQUOTA].flags & QCI_ACCT_ENABLED)
328 flags |= FS_QUOTA_GDQ_ACCT;
329 if (state->s_state[GRPQUOTA].flags & QCI_LIMITS_ENFORCED)
330 flags |= FS_QUOTA_GDQ_ENFD;
331 if (state->s_state[PRJQUOTA].flags & QCI_ACCT_ENABLED)
332 flags |= FS_QUOTA_PDQ_ACCT;
333 if (state->s_state[PRJQUOTA].flags & QCI_LIMITS_ENFORCED)
334 flags |= FS_QUOTA_PDQ_ENFD;
338 static int quota_getstate(struct super_block *sb, struct fs_quota_stat *fqs)
341 struct qc_state state;
344 memset(&state, 0, sizeof (struct qc_state));
345 ret = sb->s_qcop->get_state(sb, &state);
349 memset(fqs, 0, sizeof(*fqs));
350 fqs->qs_version = FS_QSTAT_VERSION;
351 fqs->qs_flags = quota_state_to_flags(&state);
352 /* No quota enabled? */
355 fqs->qs_incoredqs = state.s_incoredqs;
357 * GETXSTATE quotactl has space for just one set of time limits so
358 * report them for the first enabled quota type
360 for (type = 0; type < XQM_MAXQUOTAS; type++)
361 if (state.s_state[type].flags & QCI_ACCT_ENABLED)
363 BUG_ON(type == XQM_MAXQUOTAS);
364 fqs->qs_btimelimit = state.s_state[type].spc_timelimit;
365 fqs->qs_itimelimit = state.s_state[type].ino_timelimit;
366 fqs->qs_rtbtimelimit = state.s_state[type].rt_spc_timelimit;
367 fqs->qs_bwarnlimit = state.s_state[type].spc_warnlimit;
368 fqs->qs_iwarnlimit = state.s_state[type].ino_warnlimit;
370 /* Inodes may be allocated even if inactive; copy out if present */
371 if (state.s_state[USRQUOTA].ino) {
372 fqs->qs_uquota.qfs_ino = state.s_state[USRQUOTA].ino;
373 fqs->qs_uquota.qfs_nblks = state.s_state[USRQUOTA].blocks;
374 fqs->qs_uquota.qfs_nextents = state.s_state[USRQUOTA].nextents;
376 if (state.s_state[GRPQUOTA].ino) {
377 fqs->qs_gquota.qfs_ino = state.s_state[GRPQUOTA].ino;
378 fqs->qs_gquota.qfs_nblks = state.s_state[GRPQUOTA].blocks;
379 fqs->qs_gquota.qfs_nextents = state.s_state[GRPQUOTA].nextents;
381 if (state.s_state[PRJQUOTA].ino) {
383 * Q_XGETQSTAT doesn't have room for both group and project
384 * quotas. So, allow the project quota values to be copied out
385 * only if there is no group quota information available.
387 if (!(state.s_state[GRPQUOTA].flags & QCI_ACCT_ENABLED)) {
388 fqs->qs_gquota.qfs_ino = state.s_state[PRJQUOTA].ino;
389 fqs->qs_gquota.qfs_nblks =
390 state.s_state[PRJQUOTA].blocks;
391 fqs->qs_gquota.qfs_nextents =
392 state.s_state[PRJQUOTA].nextents;
398 static int quota_getxstate(struct super_block *sb, void __user *addr)
400 struct fs_quota_stat fqs;
403 if (!sb->s_qcop->get_state)
405 ret = quota_getstate(sb, &fqs);
406 if (!ret && copy_to_user(addr, &fqs, sizeof(fqs)))
411 static int quota_getstatev(struct super_block *sb, struct fs_quota_statv *fqs)
414 struct qc_state state;
417 memset(&state, 0, sizeof (struct qc_state));
418 ret = sb->s_qcop->get_state(sb, &state);
422 memset(fqs, 0, sizeof(*fqs));
423 fqs->qs_version = FS_QSTAT_VERSION;
424 fqs->qs_flags = quota_state_to_flags(&state);
425 /* No quota enabled? */
428 fqs->qs_incoredqs = state.s_incoredqs;
430 * GETXSTATV quotactl has space for just one set of time limits so
431 * report them for the first enabled quota type
433 for (type = 0; type < XQM_MAXQUOTAS; type++)
434 if (state.s_state[type].flags & QCI_ACCT_ENABLED)
436 BUG_ON(type == XQM_MAXQUOTAS);
437 fqs->qs_btimelimit = state.s_state[type].spc_timelimit;
438 fqs->qs_itimelimit = state.s_state[type].ino_timelimit;
439 fqs->qs_rtbtimelimit = state.s_state[type].rt_spc_timelimit;
440 fqs->qs_bwarnlimit = state.s_state[type].spc_warnlimit;
441 fqs->qs_iwarnlimit = state.s_state[type].ino_warnlimit;
443 /* Inodes may be allocated even if inactive; copy out if present */
444 if (state.s_state[USRQUOTA].ino) {
445 fqs->qs_uquota.qfs_ino = state.s_state[USRQUOTA].ino;
446 fqs->qs_uquota.qfs_nblks = state.s_state[USRQUOTA].blocks;
447 fqs->qs_uquota.qfs_nextents = state.s_state[USRQUOTA].nextents;
449 if (state.s_state[GRPQUOTA].ino) {
450 fqs->qs_gquota.qfs_ino = state.s_state[GRPQUOTA].ino;
451 fqs->qs_gquota.qfs_nblks = state.s_state[GRPQUOTA].blocks;
452 fqs->qs_gquota.qfs_nextents = state.s_state[GRPQUOTA].nextents;
454 if (state.s_state[PRJQUOTA].ino) {
455 fqs->qs_pquota.qfs_ino = state.s_state[PRJQUOTA].ino;
456 fqs->qs_pquota.qfs_nblks = state.s_state[PRJQUOTA].blocks;
457 fqs->qs_pquota.qfs_nextents = state.s_state[PRJQUOTA].nextents;
462 static int quota_getxstatev(struct super_block *sb, void __user *addr)
464 struct fs_quota_statv fqs;
467 if (!sb->s_qcop->get_state)
470 memset(&fqs, 0, sizeof(fqs));
471 if (copy_from_user(&fqs, addr, 1)) /* Just read qs_version */
474 /* If this kernel doesn't support user specified version, fail */
475 switch (fqs.qs_version) {
476 case FS_QSTATV_VERSION1:
481 ret = quota_getstatev(sb, &fqs);
482 if (!ret && copy_to_user(addr, &fqs, sizeof(fqs)))
488 * XFS defines BBTOB and BTOBB macros inside fs/xfs/ and we cannot move them
489 * out of there as xfsprogs rely on definitions being in that header file. So
490 * just define same functions here for quota purposes.
492 #define XFS_BB_SHIFT 9
494 static inline u64 quota_bbtob(u64 blocks)
496 return blocks << XFS_BB_SHIFT;
499 static inline u64 quota_btobb(u64 bytes)
501 return (bytes + (1 << XFS_BB_SHIFT) - 1) >> XFS_BB_SHIFT;
504 static void copy_from_xfs_dqblk(struct qc_dqblk *dst, struct fs_disk_quota *src)
506 dst->d_spc_hardlimit = quota_bbtob(src->d_blk_hardlimit);
507 dst->d_spc_softlimit = quota_bbtob(src->d_blk_softlimit);
508 dst->d_ino_hardlimit = src->d_ino_hardlimit;
509 dst->d_ino_softlimit = src->d_ino_softlimit;
510 dst->d_space = quota_bbtob(src->d_bcount);
511 dst->d_ino_count = src->d_icount;
512 dst->d_ino_timer = src->d_itimer;
513 dst->d_spc_timer = src->d_btimer;
514 dst->d_ino_warns = src->d_iwarns;
515 dst->d_spc_warns = src->d_bwarns;
516 dst->d_rt_spc_hardlimit = quota_bbtob(src->d_rtb_hardlimit);
517 dst->d_rt_spc_softlimit = quota_bbtob(src->d_rtb_softlimit);
518 dst->d_rt_space = quota_bbtob(src->d_rtbcount);
519 dst->d_rt_spc_timer = src->d_rtbtimer;
520 dst->d_rt_spc_warns = src->d_rtbwarns;
521 dst->d_fieldmask = 0;
522 if (src->d_fieldmask & FS_DQ_ISOFT)
523 dst->d_fieldmask |= QC_INO_SOFT;
524 if (src->d_fieldmask & FS_DQ_IHARD)
525 dst->d_fieldmask |= QC_INO_HARD;
526 if (src->d_fieldmask & FS_DQ_BSOFT)
527 dst->d_fieldmask |= QC_SPC_SOFT;
528 if (src->d_fieldmask & FS_DQ_BHARD)
529 dst->d_fieldmask |= QC_SPC_HARD;
530 if (src->d_fieldmask & FS_DQ_RTBSOFT)
531 dst->d_fieldmask |= QC_RT_SPC_SOFT;
532 if (src->d_fieldmask & FS_DQ_RTBHARD)
533 dst->d_fieldmask |= QC_RT_SPC_HARD;
534 if (src->d_fieldmask & FS_DQ_BTIMER)
535 dst->d_fieldmask |= QC_SPC_TIMER;
536 if (src->d_fieldmask & FS_DQ_ITIMER)
537 dst->d_fieldmask |= QC_INO_TIMER;
538 if (src->d_fieldmask & FS_DQ_RTBTIMER)
539 dst->d_fieldmask |= QC_RT_SPC_TIMER;
540 if (src->d_fieldmask & FS_DQ_BWARNS)
541 dst->d_fieldmask |= QC_SPC_WARNS;
542 if (src->d_fieldmask & FS_DQ_IWARNS)
543 dst->d_fieldmask |= QC_INO_WARNS;
544 if (src->d_fieldmask & FS_DQ_RTBWARNS)
545 dst->d_fieldmask |= QC_RT_SPC_WARNS;
546 if (src->d_fieldmask & FS_DQ_BCOUNT)
547 dst->d_fieldmask |= QC_SPACE;
548 if (src->d_fieldmask & FS_DQ_ICOUNT)
549 dst->d_fieldmask |= QC_INO_COUNT;
550 if (src->d_fieldmask & FS_DQ_RTBCOUNT)
551 dst->d_fieldmask |= QC_RT_SPACE;
554 static void copy_qcinfo_from_xfs_dqblk(struct qc_info *dst,
555 struct fs_disk_quota *src)
557 memset(dst, 0, sizeof(*dst));
558 dst->i_spc_timelimit = src->d_btimer;
559 dst->i_ino_timelimit = src->d_itimer;
560 dst->i_rt_spc_timelimit = src->d_rtbtimer;
561 dst->i_ino_warnlimit = src->d_iwarns;
562 dst->i_spc_warnlimit = src->d_bwarns;
563 dst->i_rt_spc_warnlimit = src->d_rtbwarns;
564 if (src->d_fieldmask & FS_DQ_BWARNS)
565 dst->i_fieldmask |= QC_SPC_WARNS;
566 if (src->d_fieldmask & FS_DQ_IWARNS)
567 dst->i_fieldmask |= QC_INO_WARNS;
568 if (src->d_fieldmask & FS_DQ_RTBWARNS)
569 dst->i_fieldmask |= QC_RT_SPC_WARNS;
570 if (src->d_fieldmask & FS_DQ_BTIMER)
571 dst->i_fieldmask |= QC_SPC_TIMER;
572 if (src->d_fieldmask & FS_DQ_ITIMER)
573 dst->i_fieldmask |= QC_INO_TIMER;
574 if (src->d_fieldmask & FS_DQ_RTBTIMER)
575 dst->i_fieldmask |= QC_RT_SPC_TIMER;
578 static int quota_setxquota(struct super_block *sb, int type, qid_t id,
581 struct fs_disk_quota fdq;
585 if (copy_from_user(&fdq, addr, sizeof(fdq)))
587 if (!sb->s_qcop->set_dqblk)
589 qid = make_kqid(current_user_ns(), type, id);
590 if (!qid_has_mapping(sb->s_user_ns, qid))
592 /* Are we actually setting timer / warning limits for all users? */
593 if (from_kqid(sb->s_user_ns, qid) == 0 &&
594 fdq.d_fieldmask & (FS_DQ_WARNS_MASK | FS_DQ_TIMER_MASK)) {
595 struct qc_info qinfo;
598 if (!sb->s_qcop->set_info)
600 copy_qcinfo_from_xfs_dqblk(&qinfo, &fdq);
601 ret = sb->s_qcop->set_info(sb, type, &qinfo);
604 /* These are already done */
605 fdq.d_fieldmask &= ~(FS_DQ_WARNS_MASK | FS_DQ_TIMER_MASK);
607 copy_from_xfs_dqblk(&qdq, &fdq);
608 return sb->s_qcop->set_dqblk(sb, qid, &qdq);
611 static void copy_to_xfs_dqblk(struct fs_disk_quota *dst, struct qc_dqblk *src,
614 memset(dst, 0, sizeof(*dst));
615 dst->d_version = FS_DQUOT_VERSION;
617 if (type == USRQUOTA)
618 dst->d_flags = FS_USER_QUOTA;
619 else if (type == PRJQUOTA)
620 dst->d_flags = FS_PROJ_QUOTA;
622 dst->d_flags = FS_GROUP_QUOTA;
623 dst->d_blk_hardlimit = quota_btobb(src->d_spc_hardlimit);
624 dst->d_blk_softlimit = quota_btobb(src->d_spc_softlimit);
625 dst->d_ino_hardlimit = src->d_ino_hardlimit;
626 dst->d_ino_softlimit = src->d_ino_softlimit;
627 dst->d_bcount = quota_btobb(src->d_space);
628 dst->d_icount = src->d_ino_count;
629 dst->d_itimer = src->d_ino_timer;
630 dst->d_btimer = src->d_spc_timer;
631 dst->d_iwarns = src->d_ino_warns;
632 dst->d_bwarns = src->d_spc_warns;
633 dst->d_rtb_hardlimit = quota_btobb(src->d_rt_spc_hardlimit);
634 dst->d_rtb_softlimit = quota_btobb(src->d_rt_spc_softlimit);
635 dst->d_rtbcount = quota_btobb(src->d_rt_space);
636 dst->d_rtbtimer = src->d_rt_spc_timer;
637 dst->d_rtbwarns = src->d_rt_spc_warns;
640 static int quota_getxquota(struct super_block *sb, int type, qid_t id,
643 struct fs_disk_quota fdq;
648 if (!sb->s_qcop->get_dqblk)
650 qid = make_kqid(current_user_ns(), type, id);
651 if (!qid_has_mapping(sb->s_user_ns, qid))
653 ret = sb->s_qcop->get_dqblk(sb, qid, &qdq);
656 copy_to_xfs_dqblk(&fdq, &qdq, type, id);
657 if (copy_to_user(addr, &fdq, sizeof(fdq)))
663 * Return quota for next active quota >= this id, if any exists,
664 * otherwise return -ENOENT via ->get_nextdqblk.
666 static int quota_getnextxquota(struct super_block *sb, int type, qid_t id,
669 struct fs_disk_quota fdq;
675 if (!sb->s_qcop->get_nextdqblk)
677 qid = make_kqid(current_user_ns(), type, id);
678 if (!qid_has_mapping(sb->s_user_ns, qid))
680 ret = sb->s_qcop->get_nextdqblk(sb, &qid, &qdq);
683 id_out = from_kqid(current_user_ns(), qid);
684 copy_to_xfs_dqblk(&fdq, &qdq, type, id_out);
685 if (copy_to_user(addr, &fdq, sizeof(fdq)))
690 static int quota_rmxquota(struct super_block *sb, void __user *addr)
694 if (copy_from_user(&flags, addr, sizeof(flags)))
696 if (!sb->s_qcop->rm_xquota)
698 return sb->s_qcop->rm_xquota(sb, flags);
701 /* Copy parameters and call proper function */
702 static int do_quotactl(struct super_block *sb, int type, int cmd, qid_t id,
703 void __user *addr, struct path *path)
707 if (type >= (XQM_COMMAND(cmd) ? XQM_MAXQUOTAS : MAXQUOTAS))
710 * Quota not supported on this fs? Check this before s_quota_types
711 * since they needn't be set if quota is not supported at all.
715 if (!(sb->s_quota_types & (1 << type)))
718 ret = check_quotactl_permission(sb, type, cmd, id);
724 return quota_quotaon(sb, type, id, path);
726 return quota_quotaoff(sb, type);
728 return quota_getfmt(sb, type, addr);
730 return quota_getinfo(sb, type, addr);
732 return quota_setinfo(sb, type, addr);
734 return quota_getquota(sb, type, id, addr);
736 return quota_getnextquota(sb, type, id, addr);
738 return quota_setquota(sb, type, id, addr);
740 if (!sb->s_qcop->quota_sync)
742 return sb->s_qcop->quota_sync(sb, type);
744 return quota_enable(sb, addr);
746 return quota_disable(sb, addr);
748 return quota_rmxquota(sb, addr);
750 return quota_getxstate(sb, addr);
752 return quota_getxstatev(sb, addr);
754 return quota_setxquota(sb, type, id, addr);
756 return quota_getxquota(sb, type, id, addr);
757 case Q_XGETNEXTQUOTA:
758 return quota_getnextxquota(sb, type, id, addr);
760 if (sb->s_flags & MS_RDONLY)
762 /* XFS quotas are fully coherent now, making this call a noop */
771 /* Return 1 if 'cmd' will block on frozen filesystem */
772 static int quotactl_cmd_write(int cmd)
775 * We cannot allow Q_GETQUOTA and Q_GETNEXTQUOTA without write access
776 * as dquot_acquire() may allocate space for new structure and OCFS2
777 * needs to increment on-disk use count.
786 case Q_XGETNEXTQUOTA:
793 #endif /* CONFIG_BLOCK */
796 * look up a superblock on which quota ops will be performed
797 * - use the name of a block device to find the superblock thereon
799 static struct super_block *quotactl_block(const char __user *special, int cmd)
802 struct block_device *bdev;
803 struct super_block *sb;
804 struct filename *tmp = getname(special);
807 return ERR_CAST(tmp);
808 bdev = lookup_bdev(tmp->name);
811 return ERR_CAST(bdev);
812 if (quotactl_cmd_write(cmd))
813 sb = get_super_thawed(bdev);
815 sb = get_super(bdev);
818 return ERR_PTR(-ENODEV);
822 return ERR_PTR(-ENODEV);
827 * This is the system call interface. This communicates with
828 * the user-level programs. Currently this only supports diskquota
829 * calls. Maybe we need to add the process quotas etc. in the future,
830 * but we probably should use rlimits for that.
832 SYSCALL_DEFINE4(quotactl, unsigned int, cmd, const char __user *, special,
833 qid_t, id, void __user *, addr)
836 struct super_block *sb = NULL;
837 struct path path, *pathp = NULL;
840 cmds = cmd >> SUBCMDSHIFT;
841 type = cmd & SUBCMDMASK;
844 * As a special case Q_SYNC can be called without a specific device.
845 * It will iterate all superblocks that have quota enabled and call
846 * the sync action on each of them.
850 return quota_sync_all(type);
855 * Path for quotaon has to be resolved before grabbing superblock
856 * because that gets s_umount sem which is also possibly needed by path
857 * resolution (think about autofs) and thus deadlocks could arise.
859 if (cmds == Q_QUOTAON) {
860 ret = user_path_at(AT_FDCWD, addr, LOOKUP_FOLLOW|LOOKUP_AUTOMOUNT, &path);
862 pathp = ERR_PTR(ret);
867 sb = quotactl_block(special, cmds);
873 ret = do_quotactl(sb, type, cmds, id, addr, pathp);
877 if (pathp && !IS_ERR(pathp))