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9#include <linux/fs.h>
10#include <linux/namei.h>
11#include <linux/slab.h>
12#include <asm/current.h>
13#include <linux/uaccess.h>
14#include <linux/kernel.h>
15#include <linux/security.h>
16#include <linux/syscalls.h>
17#include <linux/capability.h>
18#include <linux/quotaops.h>
19#include <linux/types.h>
20#include <linux/writeback.h>
21#include <linux/nospec.h>
22
23static int check_quotactl_permission(struct super_block *sb, int type, int cmd,
24 qid_t id)
25{
26 switch (cmd) {
27
28 case Q_GETFMT:
29 case Q_SYNC:
30 case Q_GETINFO:
31 case Q_XGETQSTAT:
32 case Q_XGETQSTATV:
33 case Q_XQUOTASYNC:
34 break;
35
36 case Q_GETQUOTA:
37 case Q_XGETQUOTA:
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))))
40 break;
41
42 default:
43 if (!capable(CAP_SYS_ADMIN))
44 return -EPERM;
45 }
46
47 return security_quotactl(cmd, type, id, sb);
48}
49
50static void quota_sync_one(struct super_block *sb, void *arg)
51{
52 int type = *(int *)arg;
53
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);
57}
58
59static int quota_sync_all(int type)
60{
61 int ret;
62
63 if (type >= MAXQUOTAS)
64 return -EINVAL;
65 ret = security_quotactl(Q_SYNC, type, 0, NULL);
66 if (!ret)
67 iterate_supers(quota_sync_one, &type);
68 return ret;
69}
70
71unsigned int qtype_enforce_flag(int type)
72{
73 switch (type) {
74 case USRQUOTA:
75 return FS_QUOTA_UDQ_ENFD;
76 case GRPQUOTA:
77 return FS_QUOTA_GDQ_ENFD;
78 case PRJQUOTA:
79 return FS_QUOTA_PDQ_ENFD;
80 }
81 return 0;
82}
83
84static int quota_quotaon(struct super_block *sb, int type, qid_t id,
85 const struct path *path)
86{
87 if (!sb->s_qcop->quota_on && !sb->s_qcop->quota_enable)
88 return -ENOSYS;
89 if (sb->s_qcop->quota_enable)
90 return sb->s_qcop->quota_enable(sb, qtype_enforce_flag(type));
91 if (IS_ERR(path))
92 return PTR_ERR(path);
93 return sb->s_qcop->quota_on(sb, type, id, path);
94}
95
96static int quota_quotaoff(struct super_block *sb, int type)
97{
98 if (!sb->s_qcop->quota_off && !sb->s_qcop->quota_disable)
99 return -ENOSYS;
100 if (sb->s_qcop->quota_disable)
101 return sb->s_qcop->quota_disable(sb, qtype_enforce_flag(type));
102 return sb->s_qcop->quota_off(sb, type);
103}
104
105static int quota_getfmt(struct super_block *sb, int type, void __user *addr)
106{
107 __u32 fmt;
108
109 if (!sb_has_quota_active(sb, type))
110 return -ESRCH;
111 fmt = sb_dqopt(sb)->info[type].dqi_format->qf_fmt_id;
112 if (copy_to_user(addr, &fmt, sizeof(fmt)))
113 return -EFAULT;
114 return 0;
115}
116
117static int quota_getinfo(struct super_block *sb, int type, void __user *addr)
118{
119 struct qc_state state;
120 struct qc_type_state *tstate;
121 struct if_dqinfo uinfo;
122 int ret;
123
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
145static 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
175static inline qsize_t qbtos(qsize_t blocks)
176{
177 return blocks << QIF_DQBLKSIZE_BITS;
178}
179
180static inline qsize_t stoqb(qsize_t space)
181{
182 return (space + QIF_DQBLKSIZE - 1) >> QIF_DQBLKSIZE_BITS;
183}
184
185static 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
199static 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
223
224
225static 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
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
249static 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
275static 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
293static 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
304static 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
315static 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
334static int quota_getstate(struct super_block *sb, int type,
335 struct fs_quota_stat *fqs)
336{
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
349 if (!fqs->qs_flags)
350 return -ENOSYS;
351 fqs->qs_incoredqs = state.s_incoredqs;
352
353 fqs->qs_btimelimit = state.s_state[type].spc_timelimit;
354 fqs->qs_itimelimit = state.s_state[type].ino_timelimit;
355 fqs->qs_rtbtimelimit = state.s_state[type].rt_spc_timelimit;
356 fqs->qs_bwarnlimit = state.s_state[type].spc_warnlimit;
357 fqs->qs_iwarnlimit = state.s_state[type].ino_warnlimit;
358
359
360 if (state.s_state[USRQUOTA].ino) {
361 fqs->qs_uquota.qfs_ino = state.s_state[USRQUOTA].ino;
362 fqs->qs_uquota.qfs_nblks = state.s_state[USRQUOTA].blocks;
363 fqs->qs_uquota.qfs_nextents = state.s_state[USRQUOTA].nextents;
364 }
365 if (state.s_state[GRPQUOTA].ino) {
366 fqs->qs_gquota.qfs_ino = state.s_state[GRPQUOTA].ino;
367 fqs->qs_gquota.qfs_nblks = state.s_state[GRPQUOTA].blocks;
368 fqs->qs_gquota.qfs_nextents = state.s_state[GRPQUOTA].nextents;
369 }
370 if (state.s_state[PRJQUOTA].ino) {
371
372
373
374
375
376 if (!(state.s_state[GRPQUOTA].flags & QCI_ACCT_ENABLED)) {
377 fqs->qs_gquota.qfs_ino = state.s_state[PRJQUOTA].ino;
378 fqs->qs_gquota.qfs_nblks =
379 state.s_state[PRJQUOTA].blocks;
380 fqs->qs_gquota.qfs_nextents =
381 state.s_state[PRJQUOTA].nextents;
382 }
383 }
384 return 0;
385}
386
387static int quota_getxstate(struct super_block *sb, int type, void __user *addr)
388{
389 struct fs_quota_stat fqs;
390 int ret;
391
392 if (!sb->s_qcop->get_state)
393 return -ENOSYS;
394 ret = quota_getstate(sb, type, &fqs);
395 if (!ret && copy_to_user(addr, &fqs, sizeof(fqs)))
396 return -EFAULT;
397 return ret;
398}
399
400static int quota_getstatev(struct super_block *sb, int type,
401 struct fs_quota_statv *fqs)
402{
403 struct qc_state state;
404 int ret;
405
406 memset(&state, 0, sizeof (struct qc_state));
407 ret = sb->s_qcop->get_state(sb, &state);
408 if (ret < 0)
409 return ret;
410
411 memset(fqs, 0, sizeof(*fqs));
412 fqs->qs_version = FS_QSTAT_VERSION;
413 fqs->qs_flags = quota_state_to_flags(&state);
414
415 if (!fqs->qs_flags)
416 return -ENOSYS;
417 fqs->qs_incoredqs = state.s_incoredqs;
418
419 fqs->qs_btimelimit = state.s_state[type].spc_timelimit;
420 fqs->qs_itimelimit = state.s_state[type].ino_timelimit;
421 fqs->qs_rtbtimelimit = state.s_state[type].rt_spc_timelimit;
422 fqs->qs_bwarnlimit = state.s_state[type].spc_warnlimit;
423 fqs->qs_iwarnlimit = state.s_state[type].ino_warnlimit;
424
425
426 if (state.s_state[USRQUOTA].ino) {
427 fqs->qs_uquota.qfs_ino = state.s_state[USRQUOTA].ino;
428 fqs->qs_uquota.qfs_nblks = state.s_state[USRQUOTA].blocks;
429 fqs->qs_uquota.qfs_nextents = state.s_state[USRQUOTA].nextents;
430 }
431 if (state.s_state[GRPQUOTA].ino) {
432 fqs->qs_gquota.qfs_ino = state.s_state[GRPQUOTA].ino;
433 fqs->qs_gquota.qfs_nblks = state.s_state[GRPQUOTA].blocks;
434 fqs->qs_gquota.qfs_nextents = state.s_state[GRPQUOTA].nextents;
435 }
436 if (state.s_state[PRJQUOTA].ino) {
437 fqs->qs_pquota.qfs_ino = state.s_state[PRJQUOTA].ino;
438 fqs->qs_pquota.qfs_nblks = state.s_state[PRJQUOTA].blocks;
439 fqs->qs_pquota.qfs_nextents = state.s_state[PRJQUOTA].nextents;
440 }
441 return 0;
442}
443
444static int quota_getxstatev(struct super_block *sb, int type, void __user *addr)
445{
446 struct fs_quota_statv fqs;
447 int ret;
448
449 if (!sb->s_qcop->get_state)
450 return -ENOSYS;
451
452 memset(&fqs, 0, sizeof(fqs));
453 if (copy_from_user(&fqs, addr, 1))
454 return -EFAULT;
455
456
457 switch (fqs.qs_version) {
458 case FS_QSTATV_VERSION1:
459 break;
460 default:
461 return -EINVAL;
462 }
463 ret = quota_getstatev(sb, type, &fqs);
464 if (!ret && copy_to_user(addr, &fqs, sizeof(fqs)))
465 return -EFAULT;
466 return ret;
467}
468
469
470
471
472
473
474#define XFS_BB_SHIFT 9
475
476static inline u64 quota_bbtob(u64 blocks)
477{
478 return blocks << XFS_BB_SHIFT;
479}
480
481static inline u64 quota_btobb(u64 bytes)
482{
483 return (bytes + (1 << XFS_BB_SHIFT) - 1) >> XFS_BB_SHIFT;
484}
485
486static void copy_from_xfs_dqblk(struct qc_dqblk *dst, struct fs_disk_quota *src)
487{
488 dst->d_spc_hardlimit = quota_bbtob(src->d_blk_hardlimit);
489 dst->d_spc_softlimit = quota_bbtob(src->d_blk_softlimit);
490 dst->d_ino_hardlimit = src->d_ino_hardlimit;
491 dst->d_ino_softlimit = src->d_ino_softlimit;
492 dst->d_space = quota_bbtob(src->d_bcount);
493 dst->d_ino_count = src->d_icount;
494 dst->d_ino_timer = src->d_itimer;
495 dst->d_spc_timer = src->d_btimer;
496 dst->d_ino_warns = src->d_iwarns;
497 dst->d_spc_warns = src->d_bwarns;
498 dst->d_rt_spc_hardlimit = quota_bbtob(src->d_rtb_hardlimit);
499 dst->d_rt_spc_softlimit = quota_bbtob(src->d_rtb_softlimit);
500 dst->d_rt_space = quota_bbtob(src->d_rtbcount);
501 dst->d_rt_spc_timer = src->d_rtbtimer;
502 dst->d_rt_spc_warns = src->d_rtbwarns;
503 dst->d_fieldmask = 0;
504 if (src->d_fieldmask & FS_DQ_ISOFT)
505 dst->d_fieldmask |= QC_INO_SOFT;
506 if (src->d_fieldmask & FS_DQ_IHARD)
507 dst->d_fieldmask |= QC_INO_HARD;
508 if (src->d_fieldmask & FS_DQ_BSOFT)
509 dst->d_fieldmask |= QC_SPC_SOFT;
510 if (src->d_fieldmask & FS_DQ_BHARD)
511 dst->d_fieldmask |= QC_SPC_HARD;
512 if (src->d_fieldmask & FS_DQ_RTBSOFT)
513 dst->d_fieldmask |= QC_RT_SPC_SOFT;
514 if (src->d_fieldmask & FS_DQ_RTBHARD)
515 dst->d_fieldmask |= QC_RT_SPC_HARD;
516 if (src->d_fieldmask & FS_DQ_BTIMER)
517 dst->d_fieldmask |= QC_SPC_TIMER;
518 if (src->d_fieldmask & FS_DQ_ITIMER)
519 dst->d_fieldmask |= QC_INO_TIMER;
520 if (src->d_fieldmask & FS_DQ_RTBTIMER)
521 dst->d_fieldmask |= QC_RT_SPC_TIMER;
522 if (src->d_fieldmask & FS_DQ_BWARNS)
523 dst->d_fieldmask |= QC_SPC_WARNS;
524 if (src->d_fieldmask & FS_DQ_IWARNS)
525 dst->d_fieldmask |= QC_INO_WARNS;
526 if (src->d_fieldmask & FS_DQ_RTBWARNS)
527 dst->d_fieldmask |= QC_RT_SPC_WARNS;
528 if (src->d_fieldmask & FS_DQ_BCOUNT)
529 dst->d_fieldmask |= QC_SPACE;
530 if (src->d_fieldmask & FS_DQ_ICOUNT)
531 dst->d_fieldmask |= QC_INO_COUNT;
532 if (src->d_fieldmask & FS_DQ_RTBCOUNT)
533 dst->d_fieldmask |= QC_RT_SPACE;
534}
535
536static void copy_qcinfo_from_xfs_dqblk(struct qc_info *dst,
537 struct fs_disk_quota *src)
538{
539 memset(dst, 0, sizeof(*dst));
540 dst->i_spc_timelimit = src->d_btimer;
541 dst->i_ino_timelimit = src->d_itimer;
542 dst->i_rt_spc_timelimit = src->d_rtbtimer;
543 dst->i_ino_warnlimit = src->d_iwarns;
544 dst->i_spc_warnlimit = src->d_bwarns;
545 dst->i_rt_spc_warnlimit = src->d_rtbwarns;
546 if (src->d_fieldmask & FS_DQ_BWARNS)
547 dst->i_fieldmask |= QC_SPC_WARNS;
548 if (src->d_fieldmask & FS_DQ_IWARNS)
549 dst->i_fieldmask |= QC_INO_WARNS;
550 if (src->d_fieldmask & FS_DQ_RTBWARNS)
551 dst->i_fieldmask |= QC_RT_SPC_WARNS;
552 if (src->d_fieldmask & FS_DQ_BTIMER)
553 dst->i_fieldmask |= QC_SPC_TIMER;
554 if (src->d_fieldmask & FS_DQ_ITIMER)
555 dst->i_fieldmask |= QC_INO_TIMER;
556 if (src->d_fieldmask & FS_DQ_RTBTIMER)
557 dst->i_fieldmask |= QC_RT_SPC_TIMER;
558}
559
560static int quota_setxquota(struct super_block *sb, int type, qid_t id,
561 void __user *addr)
562{
563 struct fs_disk_quota fdq;
564 struct qc_dqblk qdq;
565 struct kqid qid;
566
567 if (copy_from_user(&fdq, addr, sizeof(fdq)))
568 return -EFAULT;
569 if (!sb->s_qcop->set_dqblk)
570 return -ENOSYS;
571 qid = make_kqid(current_user_ns(), type, id);
572 if (!qid_has_mapping(sb->s_user_ns, qid))
573 return -EINVAL;
574
575 if (from_kqid(sb->s_user_ns, qid) == 0 &&
576 fdq.d_fieldmask & (FS_DQ_WARNS_MASK | FS_DQ_TIMER_MASK)) {
577 struct qc_info qinfo;
578 int ret;
579
580 if (!sb->s_qcop->set_info)
581 return -EINVAL;
582 copy_qcinfo_from_xfs_dqblk(&qinfo, &fdq);
583 ret = sb->s_qcop->set_info(sb, type, &qinfo);
584 if (ret)
585 return ret;
586
587 fdq.d_fieldmask &= ~(FS_DQ_WARNS_MASK | FS_DQ_TIMER_MASK);
588 }
589 copy_from_xfs_dqblk(&qdq, &fdq);
590 return sb->s_qcop->set_dqblk(sb, qid, &qdq);
591}
592
593static void copy_to_xfs_dqblk(struct fs_disk_quota *dst, struct qc_dqblk *src,
594 int type, qid_t id)
595{
596 memset(dst, 0, sizeof(*dst));
597 dst->d_version = FS_DQUOT_VERSION;
598 dst->d_id = id;
599 if (type == USRQUOTA)
600 dst->d_flags = FS_USER_QUOTA;
601 else if (type == PRJQUOTA)
602 dst->d_flags = FS_PROJ_QUOTA;
603 else
604 dst->d_flags = FS_GROUP_QUOTA;
605 dst->d_blk_hardlimit = quota_btobb(src->d_spc_hardlimit);
606 dst->d_blk_softlimit = quota_btobb(src->d_spc_softlimit);
607 dst->d_ino_hardlimit = src->d_ino_hardlimit;
608 dst->d_ino_softlimit = src->d_ino_softlimit;
609 dst->d_bcount = quota_btobb(src->d_space);
610 dst->d_icount = src->d_ino_count;
611 dst->d_itimer = src->d_ino_timer;
612 dst->d_btimer = src->d_spc_timer;
613 dst->d_iwarns = src->d_ino_warns;
614 dst->d_bwarns = src->d_spc_warns;
615 dst->d_rtb_hardlimit = quota_btobb(src->d_rt_spc_hardlimit);
616 dst->d_rtb_softlimit = quota_btobb(src->d_rt_spc_softlimit);
617 dst->d_rtbcount = quota_btobb(src->d_rt_space);
618 dst->d_rtbtimer = src->d_rt_spc_timer;
619 dst->d_rtbwarns = src->d_rt_spc_warns;
620}
621
622static int quota_getxquota(struct super_block *sb, int type, qid_t id,
623 void __user *addr)
624{
625 struct fs_disk_quota fdq;
626 struct qc_dqblk qdq;
627 struct kqid qid;
628 int ret;
629
630 if (!sb->s_qcop->get_dqblk)
631 return -ENOSYS;
632 qid = make_kqid(current_user_ns(), type, id);
633 if (!qid_has_mapping(sb->s_user_ns, qid))
634 return -EINVAL;
635 ret = sb->s_qcop->get_dqblk(sb, qid, &qdq);
636 if (ret)
637 return ret;
638 copy_to_xfs_dqblk(&fdq, &qdq, type, id);
639 if (copy_to_user(addr, &fdq, sizeof(fdq)))
640 return -EFAULT;
641 return ret;
642}
643
644
645
646
647
648static int quota_getnextxquota(struct super_block *sb, int type, qid_t id,
649 void __user *addr)
650{
651 struct fs_disk_quota fdq;
652 struct qc_dqblk qdq;
653 struct kqid qid;
654 qid_t id_out;
655 int ret;
656
657 if (!sb->s_qcop->get_nextdqblk)
658 return -ENOSYS;
659 qid = make_kqid(current_user_ns(), type, id);
660 if (!qid_has_mapping(sb->s_user_ns, qid))
661 return -EINVAL;
662 ret = sb->s_qcop->get_nextdqblk(sb, &qid, &qdq);
663 if (ret)
664 return ret;
665 id_out = from_kqid(current_user_ns(), qid);
666 copy_to_xfs_dqblk(&fdq, &qdq, type, id_out);
667 if (copy_to_user(addr, &fdq, sizeof(fdq)))
668 return -EFAULT;
669 return ret;
670}
671
672static int quota_rmxquota(struct super_block *sb, void __user *addr)
673{
674 __u32 flags;
675
676 if (copy_from_user(&flags, addr, sizeof(flags)))
677 return -EFAULT;
678 if (!sb->s_qcop->rm_xquota)
679 return -ENOSYS;
680 return sb->s_qcop->rm_xquota(sb, flags);
681}
682
683
684static int do_quotactl(struct super_block *sb, int type, int cmd, qid_t id,
685 void __user *addr, const struct path *path)
686{
687 int ret;
688
689 if (type >= MAXQUOTAS)
690 return -EINVAL;
691 type = array_index_nospec(type, MAXQUOTAS);
692
693
694
695
696 if (!sb->s_qcop)
697 return -ENOSYS;
698 if (!(sb->s_quota_types & (1 << type)))
699 return -EINVAL;
700
701 ret = check_quotactl_permission(sb, type, cmd, id);
702 if (ret < 0)
703 return ret;
704
705 switch (cmd) {
706 case Q_QUOTAON:
707 return quota_quotaon(sb, type, id, path);
708 case Q_QUOTAOFF:
709 return quota_quotaoff(sb, type);
710 case Q_GETFMT:
711 return quota_getfmt(sb, type, addr);
712 case Q_GETINFO:
713 return quota_getinfo(sb, type, addr);
714 case Q_SETINFO:
715 return quota_setinfo(sb, type, addr);
716 case Q_GETQUOTA:
717 return quota_getquota(sb, type, id, addr);
718 case Q_GETNEXTQUOTA:
719 return quota_getnextquota(sb, type, id, addr);
720 case Q_SETQUOTA:
721 return quota_setquota(sb, type, id, addr);
722 case Q_SYNC:
723 if (!sb->s_qcop->quota_sync)
724 return -ENOSYS;
725 return sb->s_qcop->quota_sync(sb, type);
726 case Q_XQUOTAON:
727 return quota_enable(sb, addr);
728 case Q_XQUOTAOFF:
729 return quota_disable(sb, addr);
730 case Q_XQUOTARM:
731 return quota_rmxquota(sb, addr);
732 case Q_XGETQSTAT:
733 return quota_getxstate(sb, type, addr);
734 case Q_XGETQSTATV:
735 return quota_getxstatev(sb, type, addr);
736 case Q_XSETQLIM:
737 return quota_setxquota(sb, type, id, addr);
738 case Q_XGETQUOTA:
739 return quota_getxquota(sb, type, id, addr);
740 case Q_XGETNEXTQUOTA:
741 return quota_getnextxquota(sb, type, id, addr);
742 case Q_XQUOTASYNC:
743 if (sb_rdonly(sb))
744 return -EROFS;
745
746 return 0;
747 default:
748 return -EINVAL;
749 }
750}
751
752#ifdef CONFIG_BLOCK
753
754
755static int quotactl_cmd_write(int cmd)
756{
757
758
759
760
761
762 switch (cmd) {
763 case Q_GETFMT:
764 case Q_GETINFO:
765 case Q_SYNC:
766 case Q_XGETQSTAT:
767 case Q_XGETQSTATV:
768 case Q_XGETQUOTA:
769 case Q_XGETNEXTQUOTA:
770 case Q_XQUOTASYNC:
771 return 0;
772 }
773 return 1;
774}
775#endif
776
777
778static bool quotactl_cmd_onoff(int cmd)
779{
780 return (cmd == Q_QUOTAON) || (cmd == Q_QUOTAOFF) ||
781 (cmd == Q_XQUOTAON) || (cmd == Q_XQUOTAOFF);
782}
783
784
785
786
787
788static struct super_block *quotactl_block(const char __user *special, int cmd)
789{
790#ifdef CONFIG_BLOCK
791 struct block_device *bdev;
792 struct super_block *sb;
793 struct filename *tmp = getname(special);
794
795 if (IS_ERR(tmp))
796 return ERR_CAST(tmp);
797 bdev = lookup_bdev(tmp->name);
798 putname(tmp);
799 if (IS_ERR(bdev))
800 return ERR_CAST(bdev);
801 if (quotactl_cmd_onoff(cmd))
802 sb = get_super_exclusive_thawed(bdev);
803 else if (quotactl_cmd_write(cmd))
804 sb = get_super_thawed(bdev);
805 else
806 sb = get_super(bdev);
807 bdput(bdev);
808 if (!sb)
809 return ERR_PTR(-ENODEV);
810
811 return sb;
812#else
813 return ERR_PTR(-ENODEV);
814#endif
815}
816
817
818
819
820
821
822
823int kernel_quotactl(unsigned int cmd, const char __user *special,
824 qid_t id, void __user *addr)
825{
826 uint cmds, type;
827 struct super_block *sb = NULL;
828 struct path path, *pathp = NULL;
829 int ret;
830
831 cmds = cmd >> SUBCMDSHIFT;
832 type = cmd & SUBCMDMASK;
833
834
835
836
837
838
839 if (!special) {
840 if (cmds == Q_SYNC)
841 return quota_sync_all(type);
842 return -ENODEV;
843 }
844
845
846
847
848
849
850 if (cmds == Q_QUOTAON) {
851 ret = user_path_at(AT_FDCWD, addr, LOOKUP_FOLLOW|LOOKUP_AUTOMOUNT, &path);
852 if (ret)
853 pathp = ERR_PTR(ret);
854 else
855 pathp = &path;
856 }
857
858 sb = quotactl_block(special, cmds);
859 if (IS_ERR(sb)) {
860 ret = PTR_ERR(sb);
861 goto out;
862 }
863
864 ret = do_quotactl(sb, type, cmds, id, addr, pathp);
865
866 if (!quotactl_cmd_onoff(cmds))
867 drop_super(sb);
868 else
869 drop_super_exclusive(sb);
870out:
871 if (pathp && !IS_ERR(pathp))
872 path_put(pathp);
873 return ret;
874}
875
876SYSCALL_DEFINE4(quotactl, unsigned int, cmd, const char __user *, special,
877 qid_t, id, void __user *, addr)
878{
879 return kernel_quotactl(cmd, special, id, addr);
880}
881
