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UBUNTU: Ubuntu-5.15.0-39.42
[mirror_ubuntu-jammy-kernel.git] / fs / quota / quota.c
CommitLineData
b2441318 1// SPDX-License-Identifier: GPL-2.0
1da177e4
LT		 2/*
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.
7 */
8
9#include <linux/fs.h>
10#include <linux/namei.h>
11#include <linux/slab.h>
12#include <asm/current.h>
f3da9310 13#include <linux/uaccess.h>
1da177e4 14#include <linux/kernel.h>
1da177e4
LT		 15#include <linux/security.h>
16#include <linux/syscalls.h>
16f7e0fe 17#include <linux/capability.h>
be586bab 18#include <linux/quotaops.h>
b716395e 19#include <linux/types.h>
9dfa23c8 20#include <linux/mount.h>
8c4e4acd 21#include <linux/writeback.h>
7b6924d9 22#include <linux/nospec.h>
80bdad3d 23#include "compat.h"
60b49885 24#include "../internal.h"
1da177e4 25
c988afb5
CH		 26static int check_quotactl_permission(struct super_block *sb, int type, int cmd,
27 qid_t id)
1da177e4 28{
c988afb5
CH		 29 switch (cmd) {
30 /* these commands do not require any special privilegues */
31 case Q_GETFMT:
32 case Q_SYNC:
33 case Q_GETINFO:
34 case Q_XGETQSTAT:
af30cb44 35 case Q_XGETQSTATV:
c988afb5
CH		 36 case Q_XQUOTASYNC:
37 break;
38 /* allow to query information for dquots we "own" */
39 case Q_GETQUOTA:
40 case Q_XGETQUOTA:
74a8a103
EB		 41 if ((type == USRQUOTA && uid_eq(current_euid(), make_kuid(current_user_ns(), id))) ||
42 (type == GRPQUOTA && in_egroup_p(make_kgid(current_user_ns(), id))))
c988afb5 43 break;
df561f66 44 fallthrough;
c988afb5 45 default:
1da177e4
LT		 46 if (!capable(CAP_SYS_ADMIN))
47 return -EPERM;
48 }
49
c988afb5 50 return security_quotactl(cmd, type, id, sb);
1da177e4
LT		 51}
52
01a05b33
AV		 53static void quota_sync_one(struct super_block *sb, void *arg)
54{
2c5f648a
JK		 55 int type = *(int *)arg;
56
57 if (sb->s_qcop && sb->s_qcop->quota_sync &&
58 (sb->s_quota_types & (1 << type)))
59 sb->s_qcop->quota_sync(sb, type);
01a05b33
AV		 60}
61
6ae09575 62static int quota_sync_all(int type)
1da177e4 63{
6ae09575
CH		 64 int ret;
65
6ae09575 66 ret = security_quotactl(Q_SYNC, type, 0, NULL);
01a05b33
AV		 67 if (!ret)
68 iterate_supers(quota_sync_one, &type);
69 return ret;
1da177e4
LT		 70}
71
d3b86324
JK		 72unsigned int qtype_enforce_flag(int type)
73{
74 switch (type) {
75 case USRQUOTA:
76 return FS_QUOTA_UDQ_ENFD;
77 case GRPQUOTA:
78 return FS_QUOTA_GDQ_ENFD;
79 case PRJQUOTA:
80 return FS_QUOTA_PDQ_ENFD;
81 }
82 return 0;
83}
84
3218a3ec 85static int quota_quotaon(struct super_block *sb, int type, qid_t id,
8c54ca9c 86 const struct path *path)
1da177e4 87{
aaa3daed 88 if (!sb->s_qcop->quota_on && !sb->s_qcop->quota_enable)
f00c9e44 89 return -ENOSYS;
d3b86324
JK		 90 if (sb->s_qcop->quota_enable)
91 return sb->s_qcop->quota_enable(sb, qtype_enforce_flag(type));
f00c9e44
JK		 92 if (IS_ERR(path))
93 return PTR_ERR(path);
94 return sb->s_qcop->quota_on(sb, type, id, path);
c411e5f6 95}
1da177e4 96
d3b86324
JK		 97static int quota_quotaoff(struct super_block *sb, int type)
98{
99 if (!sb->s_qcop->quota_off && !sb->s_qcop->quota_disable)
100 return -ENOSYS;
101 if (sb->s_qcop->quota_disable)
102 return sb->s_qcop->quota_disable(sb, qtype_enforce_flag(type));
103 return sb->s_qcop->quota_off(sb, type);
104}
105
c411e5f6
CH		 106static int quota_getfmt(struct super_block *sb, int type, void __user *addr)
107{
108 __u32 fmt;
1da177e4 109
9d1ccbe7 110 if (!sb_has_quota_active(sb, type))
c411e5f6 111 return -ESRCH;
c411e5f6 112 fmt = sb_dqopt(sb)->info[type].dqi_format->qf_fmt_id;
c411e5f6
CH		 113 if (copy_to_user(addr, &fmt, sizeof(fmt)))
114 return -EFAULT;
115 return 0;
116}
1da177e4 117
c411e5f6
CH		 118static int quota_getinfo(struct super_block *sb, int type, void __user *addr)
119{
0a240339
JK		 120 struct qc_state state;
121 struct qc_type_state *tstate;
122 struct if_dqinfo uinfo;
c411e5f6 123 int ret;
1da177e4 124
0a240339 125 if (!sb->s_qcop->get_state)
f450d4fe 126 return -ENOSYS;
0a240339
JK		 127 ret = sb->s_qcop->get_state(sb, &state);
128 if (ret)
129 return ret;
130 tstate = state.s_state + type;
131 if (!(tstate->flags & QCI_ACCT_ENABLED))
132 return -ESRCH;
133 memset(&uinfo, 0, sizeof(uinfo));
134 uinfo.dqi_bgrace = tstate->spc_timelimit;
135 uinfo.dqi_igrace = tstate->ino_timelimit;
136 if (tstate->flags & QCI_SYSFILE)
137 uinfo.dqi_flags |= DQF_SYS_FILE;
138 if (tstate->flags & QCI_ROOT_SQUASH)
139 uinfo.dqi_flags |= DQF_ROOT_SQUASH;
140 uinfo.dqi_valid = IIF_ALL;
72d4d0e4 141 if (copy_to_user(addr, &uinfo, sizeof(uinfo)))
c411e5f6 142 return -EFAULT;
72d4d0e4 143 return 0;
c411e5f6 144}
1da177e4 145
c411e5f6
CH		 146static int quota_setinfo(struct super_block *sb, int type, void __user *addr)
147{
148 struct if_dqinfo info;
5eacb2ac 149 struct qc_info qinfo;
1da177e4 150
c411e5f6
CH		 151 if (copy_from_user(&info, addr, sizeof(info)))
152 return -EFAULT;
f450d4fe
CH		 153 if (!sb->s_qcop->set_info)
154 return -ENOSYS;
5eacb2ac
JK		 155 if (info.dqi_valid & ~(IIF_FLAGS | IIF_BGRACE | IIF_IGRACE))
156 return -EINVAL;
157 memset(&qinfo, 0, sizeof(qinfo));
158 if (info.dqi_valid & IIF_FLAGS) {
159 if (info.dqi_flags & ~DQF_SETINFO_MASK)
160 return -EINVAL;
161 if (info.dqi_flags & DQF_ROOT_SQUASH)
162 qinfo.i_flags |= QCI_ROOT_SQUASH;
163 qinfo.i_fieldmask |= QC_FLAGS;
164 }
165 if (info.dqi_valid & IIF_BGRACE) {
166 qinfo.i_spc_timelimit = info.dqi_bgrace;
167 qinfo.i_fieldmask |= QC_SPC_TIMER;
168 }
169 if (info.dqi_valid & IIF_IGRACE) {
170 qinfo.i_ino_timelimit = info.dqi_igrace;
171 qinfo.i_fieldmask |= QC_INO_TIMER;
172 }
173 return sb->s_qcop->set_info(sb, type, &qinfo);
c411e5f6
CH		 174}
175
14bf61ff
JK		 176static inline qsize_t qbtos(qsize_t blocks)
177{
178 return blocks << QIF_DQBLKSIZE_BITS;
179}
180
181static inline qsize_t stoqb(qsize_t space)
182{
183 return (space + QIF_DQBLKSIZE - 1) >> QIF_DQBLKSIZE_BITS;
184}
185
186static void copy_to_if_dqblk(struct if_dqblk *dst, struct qc_dqblk *src)
b9b2dd36 187{
18da65e7 188 memset(dst, 0, sizeof(*dst));
14bf61ff
JK		 189 dst->dqb_bhardlimit = stoqb(src->d_spc_hardlimit);
190 dst->dqb_bsoftlimit = stoqb(src->d_spc_softlimit);
191 dst->dqb_curspace = src->d_space;
b9b2dd36
CH		 192 dst->dqb_ihardlimit = src->d_ino_hardlimit;
193 dst->dqb_isoftlimit = src->d_ino_softlimit;
14bf61ff
JK		 194 dst->dqb_curinodes = src->d_ino_count;
195 dst->dqb_btime = src->d_spc_timer;
196 dst->dqb_itime = src->d_ino_timer;
b9b2dd36
CH		 197 dst->dqb_valid = QIF_ALL;
198}
199
c411e5f6
CH		 200static int quota_getquota(struct super_block *sb, int type, qid_t id,
201 void __user *addr)
202{
74a8a103 203 struct kqid qid;
14bf61ff 204 struct qc_dqblk fdq;
c411e5f6
CH		 205 struct if_dqblk idq;
206 int ret;
207
f450d4fe
CH		 208 if (!sb->s_qcop->get_dqblk)
209 return -ENOSYS;
74a8a103 210 qid = make_kqid(current_user_ns(), type, id);
d49d3762 211 if (!qid_has_mapping(sb->s_user_ns, qid))
74a8a103
EB		 212 return -EINVAL;
213 ret = sb->s_qcop->get_dqblk(sb, qid, &fdq);
c411e5f6
CH		 214 if (ret)
215 return ret;
b9b2dd36 216 copy_to_if_dqblk(&idq, &fdq);
80bdad3d
CH		 217
218 if (compat_need_64bit_alignment_fixup()) {
219 struct compat_if_dqblk __user *compat_dqblk = addr;
220
221 if (copy_to_user(compat_dqblk, &idq, sizeof(*compat_dqblk)))
222 return -EFAULT;
223 if (put_user(idq.dqb_valid, &compat_dqblk->dqb_valid))
224 return -EFAULT;
225 } else {
226 if (copy_to_user(addr, &idq, sizeof(idq)))
227 return -EFAULT;
228 }
c411e5f6
CH		 229 return 0;
230}
231
926132c0
ES		 232/*
233 * Return quota for next active quota >= this id, if any exists,
ba58148b 234 * otherwise return -ENOENT via ->get_nextdqblk
926132c0
ES		 235 */
236static int quota_getnextquota(struct super_block *sb, int type, qid_t id,
237 void __user *addr)
238{
239 struct kqid qid;
240 struct qc_dqblk fdq;
241 struct if_nextdqblk idq;
242 int ret;
243
244 if (!sb->s_qcop->get_nextdqblk)
245 return -ENOSYS;
246 qid = make_kqid(current_user_ns(), type, id);
d49d3762 247 if (!qid_has_mapping(sb->s_user_ns, qid))
926132c0
ES		 248 return -EINVAL;
249 ret = sb->s_qcop->get_nextdqblk(sb, &qid, &fdq);
250 if (ret)
251 return ret;
252 /* struct if_nextdqblk is a superset of struct if_dqblk */
253 copy_to_if_dqblk((struct if_dqblk *)&idq, &fdq);
254 idq.dqb_id = from_kqid(current_user_ns(), qid);
255 if (copy_to_user(addr, &idq, sizeof(idq)))
256 return -EFAULT;
257 return 0;
258}
259
14bf61ff 260static void copy_from_if_dqblk(struct qc_dqblk *dst, struct if_dqblk *src)
c472b432 261{
14bf61ff
JK		 262 dst->d_spc_hardlimit = qbtos(src->dqb_bhardlimit);
263 dst->d_spc_softlimit = qbtos(src->dqb_bsoftlimit);
264 dst->d_space = src->dqb_curspace;
c472b432
CH		 265 dst->d_ino_hardlimit = src->dqb_ihardlimit;
266 dst->d_ino_softlimit = src->dqb_isoftlimit;
14bf61ff
JK		 267 dst->d_ino_count = src->dqb_curinodes;
268 dst->d_spc_timer = src->dqb_btime;
269 dst->d_ino_timer = src->dqb_itime;
c472b432
CH		 270
271 dst->d_fieldmask = 0;
272 if (src->dqb_valid & QIF_BLIMITS)
14bf61ff 273 dst->d_fieldmask |= QC_SPC_SOFT | QC_SPC_HARD;
c472b432 274 if (src->dqb_valid & QIF_SPACE)
14bf61ff 275 dst->d_fieldmask |= QC_SPACE;
c472b432 276 if (src->dqb_valid & QIF_ILIMITS)
14bf61ff 277 dst->d_fieldmask |= QC_INO_SOFT | QC_INO_HARD;
c472b432 278 if (src->dqb_valid & QIF_INODES)
14bf61ff 279 dst->d_fieldmask |= QC_INO_COUNT;
c472b432 280 if (src->dqb_valid & QIF_BTIME)
14bf61ff 281 dst->d_fieldmask |= QC_SPC_TIMER;
c472b432 282 if (src->dqb_valid & QIF_ITIME)
14bf61ff 283 dst->d_fieldmask |= QC_INO_TIMER;
c472b432
CH		 284}
285
c411e5f6
CH		 286static int quota_setquota(struct super_block *sb, int type, qid_t id,
287 void __user *addr)
288{
14bf61ff 289 struct qc_dqblk fdq;
c411e5f6 290 struct if_dqblk idq;
74a8a103 291 struct kqid qid;
c411e5f6 292
80bdad3d
CH		 293 if (compat_need_64bit_alignment_fixup()) {
294 struct compat_if_dqblk __user *compat_dqblk = addr;
295
296 if (copy_from_user(&idq, compat_dqblk, sizeof(*compat_dqblk)) ||
297 get_user(idq.dqb_valid, &compat_dqblk->dqb_valid))
298 return -EFAULT;
299 } else {
300 if (copy_from_user(&idq, addr, sizeof(idq)))
301 return -EFAULT;
302 }
f450d4fe
CH		 303 if (!sb->s_qcop->set_dqblk)
304 return -ENOSYS;
74a8a103 305 qid = make_kqid(current_user_ns(), type, id);
d49d3762 306 if (!qid_has_mapping(sb->s_user_ns, qid))
74a8a103 307 return -EINVAL;
c472b432 308 copy_from_if_dqblk(&fdq, &idq);
74a8a103 309 return sb->s_qcop->set_dqblk(sb, qid, &fdq);
c411e5f6
CH		 310}
311
38e478c4 312static int quota_enable(struct super_block *sb, void __user *addr)
c411e5f6
CH		 313{
314 __u32 flags;
315
316 if (copy_from_user(&flags, addr, sizeof(flags)))
317 return -EFAULT;
38e478c4 318 if (!sb->s_qcop->quota_enable)
f450d4fe 319 return -ENOSYS;
38e478c4
JK		 320 return sb->s_qcop->quota_enable(sb, flags);
321}
322
323static int quota_disable(struct super_block *sb, void __user *addr)
324{
325 __u32 flags;
326
327 if (copy_from_user(&flags, addr, sizeof(flags)))
328 return -EFAULT;
329 if (!sb->s_qcop->quota_disable)
330 return -ENOSYS;
331 return sb->s_qcop->quota_disable(sb, flags);
c411e5f6
CH		 332}
333
bc230e4a
JK		 334static int quota_state_to_flags(struct qc_state *state)
335{
336 int flags = 0;
337
338 if (state->s_state[USRQUOTA].flags & QCI_ACCT_ENABLED)
339 flags |= FS_QUOTA_UDQ_ACCT;
340 if (state->s_state[USRQUOTA].flags & QCI_LIMITS_ENFORCED)
341 flags |= FS_QUOTA_UDQ_ENFD;
342 if (state->s_state[GRPQUOTA].flags & QCI_ACCT_ENABLED)
343 flags |= FS_QUOTA_GDQ_ACCT;
344 if (state->s_state[GRPQUOTA].flags & QCI_LIMITS_ENFORCED)
345 flags |= FS_QUOTA_GDQ_ENFD;
346 if (state->s_state[PRJQUOTA].flags & QCI_ACCT_ENABLED)
347 flags |= FS_QUOTA_PDQ_ACCT;
348 if (state->s_state[PRJQUOTA].flags & QCI_LIMITS_ENFORCED)
349 flags |= FS_QUOTA_PDQ_ENFD;
350 return flags;
351}
352
555b2c3d
ES		 353static int quota_getstate(struct super_block *sb, int type,
354 struct fs_quota_stat *fqs)
bc230e4a 355{
bc230e4a
JK		 356 struct qc_state state;
357 int ret;
358
3cd0126d 359 memset(&state, 0, sizeof (struct qc_state));
bc230e4a
JK		 360 ret = sb->s_qcop->get_state(sb, &state);
361 if (ret < 0)
362 return ret;
363
364 memset(fqs, 0, sizeof(*fqs));
365 fqs->qs_version = FS_QSTAT_VERSION;
366 fqs->qs_flags = quota_state_to_flags(&state);
367 /* No quota enabled? */
368 if (!fqs->qs_flags)
369 return -ENOSYS;
370 fqs->qs_incoredqs = state.s_incoredqs;
555b2c3d 371
bc230e4a
JK		 372 fqs->qs_btimelimit = state.s_state[type].spc_timelimit;
373 fqs->qs_itimelimit = state.s_state[type].ino_timelimit;
374 fqs->qs_rtbtimelimit = state.s_state[type].rt_spc_timelimit;
375 fqs->qs_bwarnlimit = state.s_state[type].spc_warnlimit;
376 fqs->qs_iwarnlimit = state.s_state[type].ino_warnlimit;
3cd0126d
ES		 377
378 /* Inodes may be allocated even if inactive; copy out if present */
379 if (state.s_state[USRQUOTA].ino) {
bc230e4a
JK		 380 fqs->qs_uquota.qfs_ino = state.s_state[USRQUOTA].ino;
381 fqs->qs_uquota.qfs_nblks = state.s_state[USRQUOTA].blocks;
382 fqs->qs_uquota.qfs_nextents = state.s_state[USRQUOTA].nextents;
383 }
3cd0126d 384 if (state.s_state[GRPQUOTA].ino) {
bc230e4a
JK		 385 fqs->qs_gquota.qfs_ino = state.s_state[GRPQUOTA].ino;
386 fqs->qs_gquota.qfs_nblks = state.s_state[GRPQUOTA].blocks;
387 fqs->qs_gquota.qfs_nextents = state.s_state[GRPQUOTA].nextents;
388 }
3cd0126d 389 if (state.s_state[PRJQUOTA].ino) {
bc230e4a
JK		 390 /*
391 * Q_XGETQSTAT doesn't have room for both group and project
392 * quotas. So, allow the project quota values to be copied out
393 * only if there is no group quota information available.
394 */
395 if (!(state.s_state[GRPQUOTA].flags & QCI_ACCT_ENABLED)) {
396 fqs->qs_gquota.qfs_ino = state.s_state[PRJQUOTA].ino;
397 fqs->qs_gquota.qfs_nblks =
398 state.s_state[PRJQUOTA].blocks;
399 fqs->qs_gquota.qfs_nextents =
400 state.s_state[PRJQUOTA].nextents;
401 }
402 }
403 return 0;
404}
405
80bdad3d
CH		 406static int compat_copy_fs_qfilestat(struct compat_fs_qfilestat __user *to,
407 struct fs_qfilestat *from)
408{
409 if (copy_to_user(to, from, sizeof(*to)) ||
410 put_user(from->qfs_nextents, &to->qfs_nextents))
411 return -EFAULT;
412 return 0;
413}
414
415static int compat_copy_fs_quota_stat(struct compat_fs_quota_stat __user *to,
416 struct fs_quota_stat *from)
417{
418 if (put_user(from->qs_version, &to->qs_version) ||
419 put_user(from->qs_flags, &to->qs_flags) ||
420 put_user(from->qs_pad, &to->qs_pad) ||
421 compat_copy_fs_qfilestat(&to->qs_uquota, &from->qs_uquota) ||
422 compat_copy_fs_qfilestat(&to->qs_gquota, &from->qs_gquota) ||
423 put_user(from->qs_incoredqs, &to->qs_incoredqs) ||
424 put_user(from->qs_btimelimit, &to->qs_btimelimit) ||
425 put_user(from->qs_itimelimit, &to->qs_itimelimit) ||
426 put_user(from->qs_rtbtimelimit, &to->qs_rtbtimelimit) ||
427 put_user(from->qs_bwarnlimit, &to->qs_bwarnlimit) ||
428 put_user(from->qs_iwarnlimit, &to->qs_iwarnlimit))
429 return -EFAULT;
430 return 0;
431}
432
555b2c3d 433static int quota_getxstate(struct super_block *sb, int type, void __user *addr)
c411e5f6
CH		 434{
435 struct fs_quota_stat fqs;
436 int ret;
f450d4fe 437
59b6ba69 438 if (!sb->s_qcop->get_state)
f450d4fe 439 return -ENOSYS;
555b2c3d 440 ret = quota_getstate(sb, type, &fqs);
80bdad3d
CH		 441 if (ret)
442 return ret;
443
444 if (compat_need_64bit_alignment_fixup())
445 return compat_copy_fs_quota_stat(addr, &fqs);
446 if (copy_to_user(addr, &fqs, sizeof(fqs)))
c411e5f6 447 return -EFAULT;
80bdad3d 448 return 0;
c411e5f6 449}
1da177e4 450
555b2c3d
ES		 451static int quota_getstatev(struct super_block *sb, int type,
452 struct fs_quota_statv *fqs)
bc230e4a 453{
bc230e4a
JK		 454 struct qc_state state;
455 int ret;
456
3cd0126d 457 memset(&state, 0, sizeof (struct qc_state));
bc230e4a
JK		 458 ret = sb->s_qcop->get_state(sb, &state);
459 if (ret < 0)
460 return ret;
461
462 memset(fqs, 0, sizeof(*fqs));
463 fqs->qs_version = FS_QSTAT_VERSION;
464 fqs->qs_flags = quota_state_to_flags(&state);
465 /* No quota enabled? */
466 if (!fqs->qs_flags)
467 return -ENOSYS;
468 fqs->qs_incoredqs = state.s_incoredqs;
555b2c3d 469
bc230e4a
JK		 470 fqs->qs_btimelimit = state.s_state[type].spc_timelimit;
471 fqs->qs_itimelimit = state.s_state[type].ino_timelimit;
472 fqs->qs_rtbtimelimit = state.s_state[type].rt_spc_timelimit;
473 fqs->qs_bwarnlimit = state.s_state[type].spc_warnlimit;
474 fqs->qs_iwarnlimit = state.s_state[type].ino_warnlimit;
f998d7d5 475 fqs->qs_rtbwarnlimit = state.s_state[type].rt_spc_warnlimit;
3cd0126d
ES		 476
477 /* Inodes may be allocated even if inactive; copy out if present */
478 if (state.s_state[USRQUOTA].ino) {
bc230e4a
JK		 479 fqs->qs_uquota.qfs_ino = state.s_state[USRQUOTA].ino;
480 fqs->qs_uquota.qfs_nblks = state.s_state[USRQUOTA].blocks;
481 fqs->qs_uquota.qfs_nextents = state.s_state[USRQUOTA].nextents;
482 }
3cd0126d 483 if (state.s_state[GRPQUOTA].ino) {
bc230e4a
JK		 484 fqs->qs_gquota.qfs_ino = state.s_state[GRPQUOTA].ino;
485 fqs->qs_gquota.qfs_nblks = state.s_state[GRPQUOTA].blocks;
486 fqs->qs_gquota.qfs_nextents = state.s_state[GRPQUOTA].nextents;
487 }
3cd0126d 488 if (state.s_state[PRJQUOTA].ino) {
bc230e4a
JK		 489 fqs->qs_pquota.qfs_ino = state.s_state[PRJQUOTA].ino;
490 fqs->qs_pquota.qfs_nblks = state.s_state[PRJQUOTA].blocks;
491 fqs->qs_pquota.qfs_nextents = state.s_state[PRJQUOTA].nextents;
492 }
493 return 0;
494}
495
555b2c3d 496static int quota_getxstatev(struct super_block *sb, int type, void __user *addr)
af30cb44
CS		 497{
498 struct fs_quota_statv fqs;
499 int ret;
500
59b6ba69 501 if (!sb->s_qcop->get_state)
af30cb44
CS		 502 return -ENOSYS;
503
504 memset(&fqs, 0, sizeof(fqs));
505 if (copy_from_user(&fqs, addr, 1)) /* Just read qs_version */
506 return -EFAULT;
507
508 /* If this kernel doesn't support user specified version, fail */
509 switch (fqs.qs_version) {
510 case FS_QSTATV_VERSION1:
511 break;
512 default:
513 return -EINVAL;
514 }
555b2c3d 515 ret = quota_getstatev(sb, type, &fqs);
af30cb44
CS		 516 if (!ret && copy_to_user(addr, &fqs, sizeof(fqs)))
517 return -EFAULT;
518 return ret;
519}
520
14bf61ff
JK		 521/*
522 * XFS defines BBTOB and BTOBB macros inside fs/xfs/ and we cannot move them
523 * out of there as xfsprogs rely on definitions being in that header file. So
524 * just define same functions here for quota purposes.
525 */
526#define XFS_BB_SHIFT 9
527
528static inline u64 quota_bbtob(u64 blocks)
529{
530 return blocks << XFS_BB_SHIFT;
531}
532
533static inline u64 quota_btobb(u64 bytes)
534{
535 return (bytes + (1 << XFS_BB_SHIFT) - 1) >> XFS_BB_SHIFT;
536}
537
ad47ff33
DW		 538static inline s64 copy_from_xfs_dqblk_ts(const struct fs_disk_quota *d,
539 __s32 timer, __s8 timer_hi)
540{
541 if (d->d_fieldmask & FS_DQ_BIGTIME)
542 return (u32)timer | (s64)timer_hi << 32;
543 return timer;
544}
545
14bf61ff
JK		 546static void copy_from_xfs_dqblk(struct qc_dqblk *dst, struct fs_disk_quota *src)
547{
548 dst->d_spc_hardlimit = quota_bbtob(src->d_blk_hardlimit);
549 dst->d_spc_softlimit = quota_bbtob(src->d_blk_softlimit);
550 dst->d_ino_hardlimit = src->d_ino_hardlimit;
551 dst->d_ino_softlimit = src->d_ino_softlimit;
552 dst->d_space = quota_bbtob(src->d_bcount);
553 dst->d_ino_count = src->d_icount;
ad47ff33
DW		 554 dst->d_ino_timer = copy_from_xfs_dqblk_ts(src, src->d_itimer,
555 src->d_itimer_hi);
556 dst->d_spc_timer = copy_from_xfs_dqblk_ts(src, src->d_btimer,
557 src->d_btimer_hi);
14bf61ff
JK		 558 dst->d_ino_warns = src->d_iwarns;
559 dst->d_spc_warns = src->d_bwarns;
560 dst->d_rt_spc_hardlimit = quota_bbtob(src->d_rtb_hardlimit);
561 dst->d_rt_spc_softlimit = quota_bbtob(src->d_rtb_softlimit);
562 dst->d_rt_space = quota_bbtob(src->d_rtbcount);
ad47ff33
DW		 563 dst->d_rt_spc_timer = copy_from_xfs_dqblk_ts(src, src->d_rtbtimer,
564 src->d_rtbtimer_hi);
14bf61ff
JK		 565 dst->d_rt_spc_warns = src->d_rtbwarns;
566 dst->d_fieldmask = 0;
567 if (src->d_fieldmask & FS_DQ_ISOFT)
568 dst->d_fieldmask |= QC_INO_SOFT;
569 if (src->d_fieldmask & FS_DQ_IHARD)
570 dst->d_fieldmask |= QC_INO_HARD;
571 if (src->d_fieldmask & FS_DQ_BSOFT)
572 dst->d_fieldmask |= QC_SPC_SOFT;
573 if (src->d_fieldmask & FS_DQ_BHARD)
574 dst->d_fieldmask |= QC_SPC_HARD;
575 if (src->d_fieldmask & FS_DQ_RTBSOFT)
576 dst->d_fieldmask |= QC_RT_SPC_SOFT;
577 if (src->d_fieldmask & FS_DQ_RTBHARD)
578 dst->d_fieldmask |= QC_RT_SPC_HARD;
579 if (src->d_fieldmask & FS_DQ_BTIMER)
580 dst->d_fieldmask |= QC_SPC_TIMER;
581 if (src->d_fieldmask & FS_DQ_ITIMER)
582 dst->d_fieldmask |= QC_INO_TIMER;
583 if (src->d_fieldmask & FS_DQ_RTBTIMER)
584 dst->d_fieldmask |= QC_RT_SPC_TIMER;
585 if (src->d_fieldmask & FS_DQ_BWARNS)
586 dst->d_fieldmask |= QC_SPC_WARNS;
587 if (src->d_fieldmask & FS_DQ_IWARNS)
588 dst->d_fieldmask |= QC_INO_WARNS;
589 if (src->d_fieldmask & FS_DQ_RTBWARNS)
590 dst->d_fieldmask |= QC_RT_SPC_WARNS;
591 if (src->d_fieldmask & FS_DQ_BCOUNT)
592 dst->d_fieldmask |= QC_SPACE;
593 if (src->d_fieldmask & FS_DQ_ICOUNT)
594 dst->d_fieldmask |= QC_INO_COUNT;
595 if (src->d_fieldmask & FS_DQ_RTBCOUNT)
596 dst->d_fieldmask |= QC_RT_SPACE;
597}
598
c39fb53b
JK		 599static void copy_qcinfo_from_xfs_dqblk(struct qc_info *dst,
600 struct fs_disk_quota *src)
601{
602 memset(dst, 0, sizeof(*dst));
603 dst->i_spc_timelimit = src->d_btimer;
604 dst->i_ino_timelimit = src->d_itimer;
605 dst->i_rt_spc_timelimit = src->d_rtbtimer;
606 dst->i_ino_warnlimit = src->d_iwarns;
607 dst->i_spc_warnlimit = src->d_bwarns;
608 dst->i_rt_spc_warnlimit = src->d_rtbwarns;
609 if (src->d_fieldmask & FS_DQ_BWARNS)
610 dst->i_fieldmask |= QC_SPC_WARNS;
611 if (src->d_fieldmask & FS_DQ_IWARNS)
612 dst->i_fieldmask |= QC_INO_WARNS;
613 if (src->d_fieldmask & FS_DQ_RTBWARNS)
614 dst->i_fieldmask |= QC_RT_SPC_WARNS;
615 if (src->d_fieldmask & FS_DQ_BTIMER)
616 dst->i_fieldmask |= QC_SPC_TIMER;
617 if (src->d_fieldmask & FS_DQ_ITIMER)
618 dst->i_fieldmask |= QC_INO_TIMER;
619 if (src->d_fieldmask & FS_DQ_RTBTIMER)
620 dst->i_fieldmask |= QC_RT_SPC_TIMER;
621}
622
c411e5f6
CH		 623static int quota_setxquota(struct super_block *sb, int type, qid_t id,
624 void __user *addr)
625{
626 struct fs_disk_quota fdq;
14bf61ff 627 struct qc_dqblk qdq;
74a8a103 628 struct kqid qid;
c411e5f6
CH		 629
630 if (copy_from_user(&fdq, addr, sizeof(fdq)))
631 return -EFAULT;
c472b432 632 if (!sb->s_qcop->set_dqblk)
f450d4fe 633 return -ENOSYS;
74a8a103 634 qid = make_kqid(current_user_ns(), type, id);
d49d3762 635 if (!qid_has_mapping(sb->s_user_ns, qid))
74a8a103 636 return -EINVAL;
c39fb53b 637 /* Are we actually setting timer / warning limits for all users? */
cfd4c70a 638 if (from_kqid(sb->s_user_ns, qid) == 0 &&
c39fb53b
JK		 639 fdq.d_fieldmask & (FS_DQ_WARNS_MASK | FS_DQ_TIMER_MASK)) {
640 struct qc_info qinfo;
641 int ret;
642
643 if (!sb->s_qcop->set_info)
644 return -EINVAL;
645 copy_qcinfo_from_xfs_dqblk(&qinfo, &fdq);
646 ret = sb->s_qcop->set_info(sb, type, &qinfo);
647 if (ret)
648 return ret;
649 /* These are already done */
650 fdq.d_fieldmask &= ~(FS_DQ_WARNS_MASK | FS_DQ_TIMER_MASK);
651 }
14bf61ff
JK		 652 copy_from_xfs_dqblk(&qdq, &fdq);
653 return sb->s_qcop->set_dqblk(sb, qid, &qdq);
654}
655
ad47ff33
DW		 656static inline void copy_to_xfs_dqblk_ts(const struct fs_disk_quota *d,
657 __s32 *timer_lo, __s8 *timer_hi, s64 timer)
658{
659 *timer_lo = timer;
660 if (d->d_fieldmask & FS_DQ_BIGTIME)
661 *timer_hi = timer >> 32;
662}
663
664static inline bool want_bigtime(s64 timer)
665{
666 return timer > S32_MAX || timer < S32_MIN;
667}
668
14bf61ff
JK		 669static void copy_to_xfs_dqblk(struct fs_disk_quota *dst, struct qc_dqblk *src,
670 int type, qid_t id)
671{
672 memset(dst, 0, sizeof(*dst));
ad47ff33
DW		 673 if (want_bigtime(src->d_ino_timer) || want_bigtime(src->d_spc_timer) ||
674 want_bigtime(src->d_rt_spc_timer))
675 dst->d_fieldmask |= FS_DQ_BIGTIME;
14bf61ff
JK		 676 dst->d_version = FS_DQUOT_VERSION;
677 dst->d_id = id;
678 if (type == USRQUOTA)
679 dst->d_flags = FS_USER_QUOTA;
680 else if (type == PRJQUOTA)
681 dst->d_flags = FS_PROJ_QUOTA;
682 else
683 dst->d_flags = FS_GROUP_QUOTA;
684 dst->d_blk_hardlimit = quota_btobb(src->d_spc_hardlimit);
685 dst->d_blk_softlimit = quota_btobb(src->d_spc_softlimit);
686 dst->d_ino_hardlimit = src->d_ino_hardlimit;
687 dst->d_ino_softlimit = src->d_ino_softlimit;
688 dst->d_bcount = quota_btobb(src->d_space);
689 dst->d_icount = src->d_ino_count;
ad47ff33
DW		 690 copy_to_xfs_dqblk_ts(dst, &dst->d_itimer, &dst->d_itimer_hi,
691 src->d_ino_timer);
692 copy_to_xfs_dqblk_ts(dst, &dst->d_btimer, &dst->d_btimer_hi,
693 src->d_spc_timer);
14bf61ff
JK		 694 dst->d_iwarns = src->d_ino_warns;
695 dst->d_bwarns = src->d_spc_warns;
696 dst->d_rtb_hardlimit = quota_btobb(src->d_rt_spc_hardlimit);
697 dst->d_rtb_softlimit = quota_btobb(src->d_rt_spc_softlimit);
698 dst->d_rtbcount = quota_btobb(src->d_rt_space);
ad47ff33
DW		 699 copy_to_xfs_dqblk_ts(dst, &dst->d_rtbtimer, &dst->d_rtbtimer_hi,
700 src->d_rt_spc_timer);
14bf61ff 701 dst->d_rtbwarns = src->d_rt_spc_warns;
c411e5f6
CH		 702}
703
704static int quota_getxquota(struct super_block *sb, int type, qid_t id,
705 void __user *addr)
706{
707 struct fs_disk_quota fdq;
14bf61ff 708 struct qc_dqblk qdq;
74a8a103 709 struct kqid qid;
c411e5f6
CH		 710 int ret;
711
b9b2dd36 712 if (!sb->s_qcop->get_dqblk)
f450d4fe 713 return -ENOSYS;
74a8a103 714 qid = make_kqid(current_user_ns(), type, id);
d49d3762 715 if (!qid_has_mapping(sb->s_user_ns, qid))
74a8a103 716 return -EINVAL;
14bf61ff
JK		 717 ret = sb->s_qcop->get_dqblk(sb, qid, &qdq);
718 if (ret)
719 return ret;
720 copy_to_xfs_dqblk(&fdq, &qdq, type, id);
721 if (copy_to_user(addr, &fdq, sizeof(fdq)))
c411e5f6
CH		 722 return -EFAULT;
723 return ret;
724}
725
8b375249
ES		 726/*
727 * Return quota for next active quota >= this id, if any exists,
ba58148b 728 * otherwise return -ENOENT via ->get_nextdqblk.
8b375249
ES		 729 */
730static int quota_getnextxquota(struct super_block *sb, int type, qid_t id,
731 void __user *addr)
732{
733 struct fs_disk_quota fdq;
734 struct qc_dqblk qdq;
735 struct kqid qid;
736 qid_t id_out;
737 int ret;
738
739 if (!sb->s_qcop->get_nextdqblk)
740 return -ENOSYS;
741 qid = make_kqid(current_user_ns(), type, id);
d49d3762 742 if (!qid_has_mapping(sb->s_user_ns, qid))
8b375249
ES		 743 return -EINVAL;
744 ret = sb->s_qcop->get_nextdqblk(sb, &qid, &qdq);
745 if (ret)
746 return ret;
747 id_out = from_kqid(current_user_ns(), qid);
748 copy_to_xfs_dqblk(&fdq, &qdq, type, id_out);
749 if (copy_to_user(addr, &fdq, sizeof(fdq)))
750 return -EFAULT;
751 return ret;
752}
753
9da93f9b
ES		 754static int quota_rmxquota(struct super_block *sb, void __user *addr)
755{
756 __u32 flags;
757
758 if (copy_from_user(&flags, addr, sizeof(flags)))
759 return -EFAULT;
760 if (!sb->s_qcop->rm_xquota)
761 return -ENOSYS;
762 return sb->s_qcop->rm_xquota(sb, flags);
763}
764
c411e5f6
CH		 765/* Copy parameters and call proper function */
766static int do_quotactl(struct super_block *sb, int type, int cmd, qid_t id,
8c54ca9c 767 void __user *addr, const struct path *path)
c411e5f6 768{
c988afb5
CH		 769 int ret;
770
7b6924d9 771 type = array_index_nospec(type, MAXQUOTAS);
2c5f648a
JK		 772 /*
773 * Quota not supported on this fs? Check this before s_quota_types
774 * since they needn't be set if quota is not supported at all.
775 */
c988afb5
CH		 776 if (!sb->s_qcop)
777 return -ENOSYS;
2c5f648a
JK		 778 if (!(sb->s_quota_types & (1 << type)))
779 return -EINVAL;
c988afb5
CH		 780
781 ret = check_quotactl_permission(sb, type, cmd, id);
782 if (ret < 0)
783 return ret;
784
c411e5f6
CH		 785 switch (cmd) {
786 case Q_QUOTAON:
3218a3ec 787 return quota_quotaon(sb, type, id, path);
c411e5f6 788 case Q_QUOTAOFF:
d3b86324 789 return quota_quotaoff(sb, type);
c411e5f6
CH		 790 case Q_GETFMT:
791 return quota_getfmt(sb, type, addr);
792 case Q_GETINFO:
793 return quota_getinfo(sb, type, addr);
794 case Q_SETINFO:
795 return quota_setinfo(sb, type, addr);
796 case Q_GETQUOTA:
797 return quota_getquota(sb, type, id, addr);
926132c0
ES		 798 case Q_GETNEXTQUOTA:
799 return quota_getnextquota(sb, type, id, addr);
c411e5f6
CH		 800 case Q_SETQUOTA:
801 return quota_setquota(sb, type, id, addr);
802 case Q_SYNC:
6ae09575
CH		 803 if (!sb->s_qcop->quota_sync)
804 return -ENOSYS;
ceed1723 805 return sb->s_qcop->quota_sync(sb, type);
c411e5f6 806 case Q_XQUOTAON:
38e478c4 807 return quota_enable(sb, addr);
c411e5f6 808 case Q_XQUOTAOFF:
38e478c4 809 return quota_disable(sb, addr);
9da93f9b
ES		 810 case Q_XQUOTARM:
811 return quota_rmxquota(sb, addr);
c411e5f6 812 case Q_XGETQSTAT:
555b2c3d 813 return quota_getxstate(sb, type, addr);
af30cb44 814 case Q_XGETQSTATV:
555b2c3d 815 return quota_getxstatev(sb, type, addr);
c411e5f6
CH		 816 case Q_XSETQLIM:
817 return quota_setxquota(sb, type, id, addr);
818 case Q_XGETQUOTA:
819 return quota_getxquota(sb, type, id, addr);
8b375249
ES		 820 case Q_XGETNEXTQUOTA:
821 return quota_getnextxquota(sb, type, id, addr);
c411e5f6 822 case Q_XQUOTASYNC:
bc98a42c 823 if (sb_rdonly(sb))
8c4e4acd 824 return -EROFS;
4b217ed9 825 /* XFS quotas are fully coherent now, making this call a noop */
8c4e4acd 826 return 0;
c411e5f6 827 default:
f450d4fe 828 return -EINVAL;
1da177e4 829 }
1da177e4
LT		 830}
831
dcdbed85
JK		 832/* Return 1 if 'cmd' will block on frozen filesystem */
833static int quotactl_cmd_write(int cmd)
834{
ccf370e4
JK		 835 /*
836 * We cannot allow Q_GETQUOTA and Q_GETNEXTQUOTA without write access
837 * as dquot_acquire() may allocate space for new structure and OCFS2
838 * needs to increment on-disk use count.
839 */
dcdbed85
JK		 840 switch (cmd) {
841 case Q_GETFMT:
842 case Q_GETINFO:
843 case Q_SYNC:
844 case Q_XGETQSTAT:
af30cb44 845 case Q_XGETQSTATV:
dcdbed85 846 case Q_XGETQUOTA:
8b375249 847 case Q_XGETNEXTQUOTA:
dcdbed85
JK		 848 case Q_XQUOTASYNC:
849 return 0;
850 }
851 return 1;
852}
56df1278 853
7d6cd73d
JK		 854/* Return true if quotactl command is manipulating quota on/off state */
855static bool quotactl_cmd_onoff(int cmd)
856{
41c4f85c
JB		 857 return (cmd == Q_QUOTAON) || (cmd == Q_QUOTAOFF) ||
858 (cmd == Q_XQUOTAON) || (cmd == Q_XQUOTAOFF);
7d6cd73d
JK		 859}
860
9361401e
DH		 861/*
862 * look up a superblock on which quota ops will be performed
863 * - use the name of a block device to find the superblock thereon
864 */
dcdbed85 865static struct super_block *quotactl_block(const char __user *special, int cmd)
9361401e
DH		 866{
867#ifdef CONFIG_BLOCK
9361401e 868 struct super_block *sb;
91a27b2a 869 struct filename *tmp = getname(special);
60b49885 870 bool excl = false, thawed = false;
4e7b5671
CH		 871 int error;
872 dev_t dev;
9361401e
DH		 873
874 if (IS_ERR(tmp))
e231c2ee 875 return ERR_CAST(tmp);
4e7b5671 876 error = lookup_bdev(tmp->name, &dev);
9361401e 877 putname(tmp);
4e7b5671
CH		 878 if (error)
879 return ERR_PTR(error);
60b49885
CH		 880
881 if (quotactl_cmd_onoff(cmd)) {
882 excl = true;
883 thawed = true;
884 } else if (quotactl_cmd_write(cmd)) {
885 thawed = true;
886 }
887
888retry:
4e7b5671
CH		 889 sb = user_get_super(dev, excl);
890 if (!sb)
891 return ERR_PTR(-ENODEV);
892 if (thawed && sb->s_writers.frozen != SB_UNFROZEN) {
60b49885
CH		 893 if (excl)
894 up_write(&sb->s_umount);
895 else
896 up_read(&sb->s_umount);
897 wait_event(sb->s_writers.wait_unfrozen,
898 sb->s_writers.frozen == SB_UNFROZEN);
899 put_super(sb);
900 goto retry;
901 }
9361401e 902 return sb;
60b49885 903
9361401e
DH		 904#else
905 return ERR_PTR(-ENODEV);
906#endif
907}
908
1da177e4
LT		 909/*
910 * This is the system call interface. This communicates with
911 * the user-level programs. Currently this only supports diskquota
912 * calls. Maybe we need to add the process quotas etc. in the future,
913 * but we probably should use rlimits for that.
914 */
80bdad3d
CH		 915SYSCALL_DEFINE4(quotactl, unsigned int, cmd, const char __user *, special,
916 qid_t, id, void __user *, addr)
1da177e4
LT		 917{
918 uint cmds, type;
919 struct super_block *sb = NULL;
f00c9e44 920 struct path path, *pathp = NULL;
1da177e4
LT		 921 int ret;
922
923 cmds = cmd >> SUBCMDSHIFT;
924 type = cmd & SUBCMDMASK;
925
a6810312
CX		 926 if (type >= MAXQUOTAS)
927 return -EINVAL;
928
6ae09575
CH		 929 /*
930 * As a special case Q_SYNC can be called without a specific device.
931 * It will iterate all superblocks that have quota enabled and call
932 * the sync action on each of them.
933 */
934 if (!special) {
935 if (cmds == Q_SYNC)
936 return quota_sync_all(type);
937 return -ENODEV;
1da177e4
LT		 938 }
939
f00c9e44
JK		 940 /*
941 * Path for quotaon has to be resolved before grabbing superblock
942 * because that gets s_umount sem which is also possibly needed by path
943 * resolution (think about autofs) and thus deadlocks could arise.
944 */
945 if (cmds == Q_QUOTAON) {
815d405c 946 ret = user_path_at(AT_FDCWD, addr, LOOKUP_FOLLOW|LOOKUP_AUTOMOUNT, &path);
f00c9e44
JK		 947 if (ret)
948 pathp = ERR_PTR(ret);
949 else
950 pathp = &path;
951 }
952
dcdbed85 953 sb = quotactl_block(special, cmds);
0aaa6188
JK		 954 if (IS_ERR(sb)) {
955 ret = PTR_ERR(sb);
956 goto out;
957 }
6ae09575 958
f00c9e44 959 ret = do_quotactl(sb, type, cmds, id, addr, pathp);
1da177e4 960
7d6cd73d
JK		 961 if (!quotactl_cmd_onoff(cmds))
962 drop_super(sb);
963 else
964 drop_super_exclusive(sb);
0aaa6188 965out:
f00c9e44
JK		 966 if (pathp && !IS_ERR(pathp))
967 path_put(pathp);
1da177e4
LT		 968 return ret;
969}
9dfa23c8 970
64c2c2c6
JK		 971SYSCALL_DEFINE4(quotactl_fd, unsigned int, fd, unsigned int, cmd,
972 qid_t, id, void __user *, addr)
9dfa23c8
SH		 973{
974 struct super_block *sb;
9dfa23c8
SH		 975 unsigned int cmds = cmd >> SUBCMDSHIFT;
976 unsigned int type = cmd & SUBCMDMASK;
64c2c2c6 977 struct fd f;
9dfa23c8
SH		 978 int ret;
979
64c2c2c6
JK		 980 f = fdget_raw(fd);
981 if (!f.file)
982 return -EBADF;
9dfa23c8 983
64c2c2c6
JK		 984 ret = -EINVAL;
985 if (type >= MAXQUOTAS)
986 goto out;
9dfa23c8
SH		 987
988 if (quotactl_cmd_write(cmds)) {
64c2c2c6 989 ret = mnt_want_write(f.file->f_path.mnt);
9dfa23c8
SH		 990 if (ret)
991 goto out;
992 }
993
64c2c2c6 994 sb = f.file->f_path.mnt->mnt_sb;
9dfa23c8
SH		 995 if (quotactl_cmd_onoff(cmds))
996 down_write(&sb->s_umount);
997 else
998 down_read(&sb->s_umount);
999
1000 ret = do_quotactl(sb, type, cmds, id, addr, ERR_PTR(-EINVAL));
1001
1002 if (quotactl_cmd_onoff(cmds))
1003 up_write(&sb->s_umount);
1004 else
1005 up_read(&sb->s_umount);
1006
1007 if (quotactl_cmd_write(cmds))
64c2c2c6 1008 mnt_drop_write(f.file->f_path.mnt);
9dfa23c8 1009out:
64c2c2c6 1010 fdput(f);
9dfa23c8
SH		 1011 return ret;
1012}
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