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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> |
8c4e4acd | 20 | #include <linux/writeback.h> |
1da177e4 | 21 | |
c988afb5 CH |
22 | static int check_quotactl_permission(struct super_block *sb, int type, int cmd, |
23 | qid_t id) | |
1da177e4 | 24 | { |
c988afb5 CH |
25 | switch (cmd) { |
26 | /* these commands do not require any special privilegues */ | |
27 | case Q_GETFMT: | |
28 | case Q_SYNC: | |
29 | case Q_GETINFO: | |
30 | case Q_XGETQSTAT: | |
af30cb44 | 31 | case Q_XGETQSTATV: |
c988afb5 CH |
32 | case Q_XQUOTASYNC: |
33 | break; | |
34 | /* allow to query information for dquots we "own" */ | |
35 | case Q_GETQUOTA: | |
36 | case Q_XGETQUOTA: | |
74a8a103 EB |
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)))) | |
c988afb5 CH |
39 | break; |
40 | /*FALLTHROUGH*/ | |
41 | default: | |
1da177e4 LT |
42 | if (!capable(CAP_SYS_ADMIN)) |
43 | return -EPERM; | |
44 | } | |
45 | ||
c988afb5 | 46 | return security_quotactl(cmd, type, id, sb); |
1da177e4 LT |
47 | } |
48 | ||
01a05b33 AV |
49 | static void quota_sync_one(struct super_block *sb, void *arg) |
50 | { | |
2c5f648a JK |
51 | int type = *(int *)arg; |
52 | ||
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); | |
01a05b33 AV |
56 | } |
57 | ||
6ae09575 | 58 | static int quota_sync_all(int type) |
1da177e4 | 59 | { |
6ae09575 CH |
60 | int ret; |
61 | ||
62 | if (type >= MAXQUOTAS) | |
63 | return -EINVAL; | |
64 | ret = security_quotactl(Q_SYNC, type, 0, NULL); | |
01a05b33 AV |
65 | if (!ret) |
66 | iterate_supers(quota_sync_one, &type); | |
67 | return ret; | |
1da177e4 LT |
68 | } |
69 | ||
d3b86324 JK |
70 | unsigned int qtype_enforce_flag(int type) |
71 | { | |
72 | switch (type) { | |
73 | case USRQUOTA: | |
74 | return FS_QUOTA_UDQ_ENFD; | |
75 | case GRPQUOTA: | |
76 | return FS_QUOTA_GDQ_ENFD; | |
77 | case PRJQUOTA: | |
78 | return FS_QUOTA_PDQ_ENFD; | |
79 | } | |
80 | return 0; | |
81 | } | |
82 | ||
3218a3ec | 83 | static int quota_quotaon(struct super_block *sb, int type, qid_t id, |
8c54ca9c | 84 | const struct path *path) |
1da177e4 | 85 | { |
aaa3daed | 86 | if (!sb->s_qcop->quota_on && !sb->s_qcop->quota_enable) |
f00c9e44 | 87 | return -ENOSYS; |
d3b86324 JK |
88 | if (sb->s_qcop->quota_enable) |
89 | return sb->s_qcop->quota_enable(sb, qtype_enforce_flag(type)); | |
f00c9e44 JK |
90 | if (IS_ERR(path)) |
91 | return PTR_ERR(path); | |
92 | return sb->s_qcop->quota_on(sb, type, id, path); | |
c411e5f6 | 93 | } |
1da177e4 | 94 | |
d3b86324 JK |
95 | static int quota_quotaoff(struct super_block *sb, int type) |
96 | { | |
97 | if (!sb->s_qcop->quota_off && !sb->s_qcop->quota_disable) | |
98 | return -ENOSYS; | |
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); | |
102 | } | |
103 | ||
c411e5f6 CH |
104 | static int quota_getfmt(struct super_block *sb, int type, void __user *addr) |
105 | { | |
106 | __u32 fmt; | |
1da177e4 | 107 | |
9d1ccbe7 | 108 | if (!sb_has_quota_active(sb, type)) |
c411e5f6 | 109 | return -ESRCH; |
c411e5f6 | 110 | fmt = sb_dqopt(sb)->info[type].dqi_format->qf_fmt_id; |
c411e5f6 CH |
111 | if (copy_to_user(addr, &fmt, sizeof(fmt))) |
112 | return -EFAULT; | |
113 | return 0; | |
114 | } | |
1da177e4 | 115 | |
c411e5f6 CH |
116 | static int quota_getinfo(struct super_block *sb, int type, void __user *addr) |
117 | { | |
0a240339 JK |
118 | struct qc_state state; |
119 | struct qc_type_state *tstate; | |
120 | struct if_dqinfo uinfo; | |
c411e5f6 | 121 | int ret; |
1da177e4 | 122 | |
0a240339 JK |
123 | /* This checks whether qc_state has enough entries... */ |
124 | BUILD_BUG_ON(MAXQUOTAS > XQM_MAXQUOTAS); | |
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 |
146 | static 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 |
176 | static inline qsize_t qbtos(qsize_t blocks) |
177 | { | |
178 | return blocks << QIF_DQBLKSIZE_BITS; | |
179 | } | |
180 | ||
181 | static inline qsize_t stoqb(qsize_t space) | |
182 | { | |
183 | return (space + QIF_DQBLKSIZE - 1) >> QIF_DQBLKSIZE_BITS; | |
184 | } | |
185 | ||
186 | static 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 |
200 | static 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); |
c411e5f6 CH |
217 | if (copy_to_user(addr, &idq, sizeof(idq))) |
218 | return -EFAULT; | |
219 | return 0; | |
220 | } | |
221 | ||
926132c0 ES |
222 | /* |
223 | * Return quota for next active quota >= this id, if any exists, | |
ba58148b | 224 | * otherwise return -ENOENT via ->get_nextdqblk |
926132c0 ES |
225 | */ |
226 | static int quota_getnextquota(struct super_block *sb, int type, qid_t id, | |
227 | void __user *addr) | |
228 | { | |
229 | struct kqid qid; | |
230 | struct qc_dqblk fdq; | |
231 | struct if_nextdqblk idq; | |
232 | int ret; | |
233 | ||
234 | if (!sb->s_qcop->get_nextdqblk) | |
235 | return -ENOSYS; | |
236 | qid = make_kqid(current_user_ns(), type, id); | |
d49d3762 | 237 | if (!qid_has_mapping(sb->s_user_ns, qid)) |
926132c0 ES |
238 | return -EINVAL; |
239 | ret = sb->s_qcop->get_nextdqblk(sb, &qid, &fdq); | |
240 | if (ret) | |
241 | return ret; | |
242 | /* struct if_nextdqblk is a superset of struct if_dqblk */ | |
243 | copy_to_if_dqblk((struct if_dqblk *)&idq, &fdq); | |
244 | idq.dqb_id = from_kqid(current_user_ns(), qid); | |
245 | if (copy_to_user(addr, &idq, sizeof(idq))) | |
246 | return -EFAULT; | |
247 | return 0; | |
248 | } | |
249 | ||
14bf61ff | 250 | static void copy_from_if_dqblk(struct qc_dqblk *dst, struct if_dqblk *src) |
c472b432 | 251 | { |
14bf61ff JK |
252 | dst->d_spc_hardlimit = qbtos(src->dqb_bhardlimit); |
253 | dst->d_spc_softlimit = qbtos(src->dqb_bsoftlimit); | |
254 | dst->d_space = src->dqb_curspace; | |
c472b432 CH |
255 | dst->d_ino_hardlimit = src->dqb_ihardlimit; |
256 | dst->d_ino_softlimit = src->dqb_isoftlimit; | |
14bf61ff JK |
257 | dst->d_ino_count = src->dqb_curinodes; |
258 | dst->d_spc_timer = src->dqb_btime; | |
259 | dst->d_ino_timer = src->dqb_itime; | |
c472b432 CH |
260 | |
261 | dst->d_fieldmask = 0; | |
262 | if (src->dqb_valid & QIF_BLIMITS) | |
14bf61ff | 263 | dst->d_fieldmask |= QC_SPC_SOFT | QC_SPC_HARD; |
c472b432 | 264 | if (src->dqb_valid & QIF_SPACE) |
14bf61ff | 265 | dst->d_fieldmask |= QC_SPACE; |
c472b432 | 266 | if (src->dqb_valid & QIF_ILIMITS) |
14bf61ff | 267 | dst->d_fieldmask |= QC_INO_SOFT | QC_INO_HARD; |
c472b432 | 268 | if (src->dqb_valid & QIF_INODES) |
14bf61ff | 269 | dst->d_fieldmask |= QC_INO_COUNT; |
c472b432 | 270 | if (src->dqb_valid & QIF_BTIME) |
14bf61ff | 271 | dst->d_fieldmask |= QC_SPC_TIMER; |
c472b432 | 272 | if (src->dqb_valid & QIF_ITIME) |
14bf61ff | 273 | dst->d_fieldmask |= QC_INO_TIMER; |
c472b432 CH |
274 | } |
275 | ||
c411e5f6 CH |
276 | static int quota_setquota(struct super_block *sb, int type, qid_t id, |
277 | void __user *addr) | |
278 | { | |
14bf61ff | 279 | struct qc_dqblk fdq; |
c411e5f6 | 280 | struct if_dqblk idq; |
74a8a103 | 281 | struct kqid qid; |
c411e5f6 CH |
282 | |
283 | if (copy_from_user(&idq, addr, sizeof(idq))) | |
284 | return -EFAULT; | |
f450d4fe CH |
285 | if (!sb->s_qcop->set_dqblk) |
286 | return -ENOSYS; | |
74a8a103 | 287 | qid = make_kqid(current_user_ns(), type, id); |
d49d3762 | 288 | if (!qid_has_mapping(sb->s_user_ns, qid)) |
74a8a103 | 289 | return -EINVAL; |
c472b432 | 290 | copy_from_if_dqblk(&fdq, &idq); |
74a8a103 | 291 | return sb->s_qcop->set_dqblk(sb, qid, &fdq); |
c411e5f6 CH |
292 | } |
293 | ||
38e478c4 | 294 | static int quota_enable(struct super_block *sb, void __user *addr) |
c411e5f6 CH |
295 | { |
296 | __u32 flags; | |
297 | ||
298 | if (copy_from_user(&flags, addr, sizeof(flags))) | |
299 | return -EFAULT; | |
38e478c4 | 300 | if (!sb->s_qcop->quota_enable) |
f450d4fe | 301 | return -ENOSYS; |
38e478c4 JK |
302 | return sb->s_qcop->quota_enable(sb, flags); |
303 | } | |
304 | ||
305 | static int quota_disable(struct super_block *sb, void __user *addr) | |
306 | { | |
307 | __u32 flags; | |
308 | ||
309 | if (copy_from_user(&flags, addr, sizeof(flags))) | |
310 | return -EFAULT; | |
311 | if (!sb->s_qcop->quota_disable) | |
312 | return -ENOSYS; | |
313 | return sb->s_qcop->quota_disable(sb, flags); | |
c411e5f6 CH |
314 | } |
315 | ||
bc230e4a JK |
316 | static int quota_state_to_flags(struct qc_state *state) |
317 | { | |
318 | int flags = 0; | |
319 | ||
320 | if (state->s_state[USRQUOTA].flags & QCI_ACCT_ENABLED) | |
321 | flags |= FS_QUOTA_UDQ_ACCT; | |
322 | if (state->s_state[USRQUOTA].flags & QCI_LIMITS_ENFORCED) | |
323 | flags |= FS_QUOTA_UDQ_ENFD; | |
324 | if (state->s_state[GRPQUOTA].flags & QCI_ACCT_ENABLED) | |
325 | flags |= FS_QUOTA_GDQ_ACCT; | |
326 | if (state->s_state[GRPQUOTA].flags & QCI_LIMITS_ENFORCED) | |
327 | flags |= FS_QUOTA_GDQ_ENFD; | |
328 | if (state->s_state[PRJQUOTA].flags & QCI_ACCT_ENABLED) | |
329 | flags |= FS_QUOTA_PDQ_ACCT; | |
330 | if (state->s_state[PRJQUOTA].flags & QCI_LIMITS_ENFORCED) | |
331 | flags |= FS_QUOTA_PDQ_ENFD; | |
332 | return flags; | |
333 | } | |
334 | ||
335 | static int quota_getstate(struct super_block *sb, struct fs_quota_stat *fqs) | |
336 | { | |
337 | int type; | |
338 | struct qc_state state; | |
339 | int ret; | |
340 | ||
3cd0126d | 341 | memset(&state, 0, sizeof (struct qc_state)); |
bc230e4a JK |
342 | ret = sb->s_qcop->get_state(sb, &state); |
343 | if (ret < 0) | |
344 | return ret; | |
345 | ||
346 | memset(fqs, 0, sizeof(*fqs)); | |
347 | fqs->qs_version = FS_QSTAT_VERSION; | |
348 | fqs->qs_flags = quota_state_to_flags(&state); | |
349 | /* No quota enabled? */ | |
350 | if (!fqs->qs_flags) | |
351 | return -ENOSYS; | |
352 | fqs->qs_incoredqs = state.s_incoredqs; | |
353 | /* | |
354 | * GETXSTATE quotactl has space for just one set of time limits so | |
355 | * report them for the first enabled quota type | |
356 | */ | |
357 | for (type = 0; type < XQM_MAXQUOTAS; type++) | |
358 | if (state.s_state[type].flags & QCI_ACCT_ENABLED) | |
359 | break; | |
360 | BUG_ON(type == XQM_MAXQUOTAS); | |
361 | fqs->qs_btimelimit = state.s_state[type].spc_timelimit; | |
362 | fqs->qs_itimelimit = state.s_state[type].ino_timelimit; | |
363 | fqs->qs_rtbtimelimit = state.s_state[type].rt_spc_timelimit; | |
364 | fqs->qs_bwarnlimit = state.s_state[type].spc_warnlimit; | |
365 | fqs->qs_iwarnlimit = state.s_state[type].ino_warnlimit; | |
3cd0126d ES |
366 | |
367 | /* Inodes may be allocated even if inactive; copy out if present */ | |
368 | if (state.s_state[USRQUOTA].ino) { | |
bc230e4a JK |
369 | fqs->qs_uquota.qfs_ino = state.s_state[USRQUOTA].ino; |
370 | fqs->qs_uquota.qfs_nblks = state.s_state[USRQUOTA].blocks; | |
371 | fqs->qs_uquota.qfs_nextents = state.s_state[USRQUOTA].nextents; | |
372 | } | |
3cd0126d | 373 | if (state.s_state[GRPQUOTA].ino) { |
bc230e4a JK |
374 | fqs->qs_gquota.qfs_ino = state.s_state[GRPQUOTA].ino; |
375 | fqs->qs_gquota.qfs_nblks = state.s_state[GRPQUOTA].blocks; | |
376 | fqs->qs_gquota.qfs_nextents = state.s_state[GRPQUOTA].nextents; | |
377 | } | |
3cd0126d | 378 | if (state.s_state[PRJQUOTA].ino) { |
bc230e4a JK |
379 | /* |
380 | * Q_XGETQSTAT doesn't have room for both group and project | |
381 | * quotas. So, allow the project quota values to be copied out | |
382 | * only if there is no group quota information available. | |
383 | */ | |
384 | if (!(state.s_state[GRPQUOTA].flags & QCI_ACCT_ENABLED)) { | |
385 | fqs->qs_gquota.qfs_ino = state.s_state[PRJQUOTA].ino; | |
386 | fqs->qs_gquota.qfs_nblks = | |
387 | state.s_state[PRJQUOTA].blocks; | |
388 | fqs->qs_gquota.qfs_nextents = | |
389 | state.s_state[PRJQUOTA].nextents; | |
390 | } | |
391 | } | |
392 | return 0; | |
393 | } | |
394 | ||
c411e5f6 CH |
395 | static int quota_getxstate(struct super_block *sb, void __user *addr) |
396 | { | |
397 | struct fs_quota_stat fqs; | |
398 | int ret; | |
f450d4fe | 399 | |
59b6ba69 | 400 | if (!sb->s_qcop->get_state) |
f450d4fe | 401 | return -ENOSYS; |
59b6ba69 | 402 | ret = quota_getstate(sb, &fqs); |
c411e5f6 CH |
403 | if (!ret && copy_to_user(addr, &fqs, sizeof(fqs))) |
404 | return -EFAULT; | |
405 | return ret; | |
406 | } | |
1da177e4 | 407 | |
bc230e4a JK |
408 | static int quota_getstatev(struct super_block *sb, struct fs_quota_statv *fqs) |
409 | { | |
410 | int type; | |
411 | struct qc_state state; | |
412 | int ret; | |
413 | ||
3cd0126d | 414 | memset(&state, 0, sizeof (struct qc_state)); |
bc230e4a JK |
415 | ret = sb->s_qcop->get_state(sb, &state); |
416 | if (ret < 0) | |
417 | return ret; | |
418 | ||
419 | memset(fqs, 0, sizeof(*fqs)); | |
420 | fqs->qs_version = FS_QSTAT_VERSION; | |
421 | fqs->qs_flags = quota_state_to_flags(&state); | |
422 | /* No quota enabled? */ | |
423 | if (!fqs->qs_flags) | |
424 | return -ENOSYS; | |
425 | fqs->qs_incoredqs = state.s_incoredqs; | |
426 | /* | |
427 | * GETXSTATV quotactl has space for just one set of time limits so | |
428 | * report them for the first enabled quota type | |
429 | */ | |
430 | for (type = 0; type < XQM_MAXQUOTAS; type++) | |
431 | if (state.s_state[type].flags & QCI_ACCT_ENABLED) | |
432 | break; | |
433 | BUG_ON(type == XQM_MAXQUOTAS); | |
434 | fqs->qs_btimelimit = state.s_state[type].spc_timelimit; | |
435 | fqs->qs_itimelimit = state.s_state[type].ino_timelimit; | |
436 | fqs->qs_rtbtimelimit = state.s_state[type].rt_spc_timelimit; | |
437 | fqs->qs_bwarnlimit = state.s_state[type].spc_warnlimit; | |
438 | fqs->qs_iwarnlimit = state.s_state[type].ino_warnlimit; | |
3cd0126d ES |
439 | |
440 | /* Inodes may be allocated even if inactive; copy out if present */ | |
441 | if (state.s_state[USRQUOTA].ino) { | |
bc230e4a JK |
442 | fqs->qs_uquota.qfs_ino = state.s_state[USRQUOTA].ino; |
443 | fqs->qs_uquota.qfs_nblks = state.s_state[USRQUOTA].blocks; | |
444 | fqs->qs_uquota.qfs_nextents = state.s_state[USRQUOTA].nextents; | |
445 | } | |
3cd0126d | 446 | if (state.s_state[GRPQUOTA].ino) { |
bc230e4a JK |
447 | fqs->qs_gquota.qfs_ino = state.s_state[GRPQUOTA].ino; |
448 | fqs->qs_gquota.qfs_nblks = state.s_state[GRPQUOTA].blocks; | |
449 | fqs->qs_gquota.qfs_nextents = state.s_state[GRPQUOTA].nextents; | |
450 | } | |
3cd0126d | 451 | if (state.s_state[PRJQUOTA].ino) { |
bc230e4a JK |
452 | fqs->qs_pquota.qfs_ino = state.s_state[PRJQUOTA].ino; |
453 | fqs->qs_pquota.qfs_nblks = state.s_state[PRJQUOTA].blocks; | |
454 | fqs->qs_pquota.qfs_nextents = state.s_state[PRJQUOTA].nextents; | |
455 | } | |
456 | return 0; | |
457 | } | |
458 | ||
af30cb44 CS |
459 | static int quota_getxstatev(struct super_block *sb, void __user *addr) |
460 | { | |
461 | struct fs_quota_statv fqs; | |
462 | int ret; | |
463 | ||
59b6ba69 | 464 | if (!sb->s_qcop->get_state) |
af30cb44 CS |
465 | return -ENOSYS; |
466 | ||
467 | memset(&fqs, 0, sizeof(fqs)); | |
468 | if (copy_from_user(&fqs, addr, 1)) /* Just read qs_version */ | |
469 | return -EFAULT; | |
470 | ||
471 | /* If this kernel doesn't support user specified version, fail */ | |
472 | switch (fqs.qs_version) { | |
473 | case FS_QSTATV_VERSION1: | |
474 | break; | |
475 | default: | |
476 | return -EINVAL; | |
477 | } | |
59b6ba69 | 478 | ret = quota_getstatev(sb, &fqs); |
af30cb44 CS |
479 | if (!ret && copy_to_user(addr, &fqs, sizeof(fqs))) |
480 | return -EFAULT; | |
481 | return ret; | |
482 | } | |
483 | ||
14bf61ff JK |
484 | /* |
485 | * XFS defines BBTOB and BTOBB macros inside fs/xfs/ and we cannot move them | |
486 | * out of there as xfsprogs rely on definitions being in that header file. So | |
487 | * just define same functions here for quota purposes. | |
488 | */ | |
489 | #define XFS_BB_SHIFT 9 | |
490 | ||
491 | static inline u64 quota_bbtob(u64 blocks) | |
492 | { | |
493 | return blocks << XFS_BB_SHIFT; | |
494 | } | |
495 | ||
496 | static inline u64 quota_btobb(u64 bytes) | |
497 | { | |
498 | return (bytes + (1 << XFS_BB_SHIFT) - 1) >> XFS_BB_SHIFT; | |
499 | } | |
500 | ||
501 | static void copy_from_xfs_dqblk(struct qc_dqblk *dst, struct fs_disk_quota *src) | |
502 | { | |
503 | dst->d_spc_hardlimit = quota_bbtob(src->d_blk_hardlimit); | |
504 | dst->d_spc_softlimit = quota_bbtob(src->d_blk_softlimit); | |
505 | dst->d_ino_hardlimit = src->d_ino_hardlimit; | |
506 | dst->d_ino_softlimit = src->d_ino_softlimit; | |
507 | dst->d_space = quota_bbtob(src->d_bcount); | |
508 | dst->d_ino_count = src->d_icount; | |
509 | dst->d_ino_timer = src->d_itimer; | |
510 | dst->d_spc_timer = src->d_btimer; | |
511 | dst->d_ino_warns = src->d_iwarns; | |
512 | dst->d_spc_warns = src->d_bwarns; | |
513 | dst->d_rt_spc_hardlimit = quota_bbtob(src->d_rtb_hardlimit); | |
514 | dst->d_rt_spc_softlimit = quota_bbtob(src->d_rtb_softlimit); | |
515 | dst->d_rt_space = quota_bbtob(src->d_rtbcount); | |
516 | dst->d_rt_spc_timer = src->d_rtbtimer; | |
517 | dst->d_rt_spc_warns = src->d_rtbwarns; | |
518 | dst->d_fieldmask = 0; | |
519 | if (src->d_fieldmask & FS_DQ_ISOFT) | |
520 | dst->d_fieldmask |= QC_INO_SOFT; | |
521 | if (src->d_fieldmask & FS_DQ_IHARD) | |
522 | dst->d_fieldmask |= QC_INO_HARD; | |
523 | if (src->d_fieldmask & FS_DQ_BSOFT) | |
524 | dst->d_fieldmask |= QC_SPC_SOFT; | |
525 | if (src->d_fieldmask & FS_DQ_BHARD) | |
526 | dst->d_fieldmask |= QC_SPC_HARD; | |
527 | if (src->d_fieldmask & FS_DQ_RTBSOFT) | |
528 | dst->d_fieldmask |= QC_RT_SPC_SOFT; | |
529 | if (src->d_fieldmask & FS_DQ_RTBHARD) | |
530 | dst->d_fieldmask |= QC_RT_SPC_HARD; | |
531 | if (src->d_fieldmask & FS_DQ_BTIMER) | |
532 | dst->d_fieldmask |= QC_SPC_TIMER; | |
533 | if (src->d_fieldmask & FS_DQ_ITIMER) | |
534 | dst->d_fieldmask |= QC_INO_TIMER; | |
535 | if (src->d_fieldmask & FS_DQ_RTBTIMER) | |
536 | dst->d_fieldmask |= QC_RT_SPC_TIMER; | |
537 | if (src->d_fieldmask & FS_DQ_BWARNS) | |
538 | dst->d_fieldmask |= QC_SPC_WARNS; | |
539 | if (src->d_fieldmask & FS_DQ_IWARNS) | |
540 | dst->d_fieldmask |= QC_INO_WARNS; | |
541 | if (src->d_fieldmask & FS_DQ_RTBWARNS) | |
542 | dst->d_fieldmask |= QC_RT_SPC_WARNS; | |
543 | if (src->d_fieldmask & FS_DQ_BCOUNT) | |
544 | dst->d_fieldmask |= QC_SPACE; | |
545 | if (src->d_fieldmask & FS_DQ_ICOUNT) | |
546 | dst->d_fieldmask |= QC_INO_COUNT; | |
547 | if (src->d_fieldmask & FS_DQ_RTBCOUNT) | |
548 | dst->d_fieldmask |= QC_RT_SPACE; | |
549 | } | |
550 | ||
c39fb53b JK |
551 | static void copy_qcinfo_from_xfs_dqblk(struct qc_info *dst, |
552 | struct fs_disk_quota *src) | |
553 | { | |
554 | memset(dst, 0, sizeof(*dst)); | |
555 | dst->i_spc_timelimit = src->d_btimer; | |
556 | dst->i_ino_timelimit = src->d_itimer; | |
557 | dst->i_rt_spc_timelimit = src->d_rtbtimer; | |
558 | dst->i_ino_warnlimit = src->d_iwarns; | |
559 | dst->i_spc_warnlimit = src->d_bwarns; | |
560 | dst->i_rt_spc_warnlimit = src->d_rtbwarns; | |
561 | if (src->d_fieldmask & FS_DQ_BWARNS) | |
562 | dst->i_fieldmask |= QC_SPC_WARNS; | |
563 | if (src->d_fieldmask & FS_DQ_IWARNS) | |
564 | dst->i_fieldmask |= QC_INO_WARNS; | |
565 | if (src->d_fieldmask & FS_DQ_RTBWARNS) | |
566 | dst->i_fieldmask |= QC_RT_SPC_WARNS; | |
567 | if (src->d_fieldmask & FS_DQ_BTIMER) | |
568 | dst->i_fieldmask |= QC_SPC_TIMER; | |
569 | if (src->d_fieldmask & FS_DQ_ITIMER) | |
570 | dst->i_fieldmask |= QC_INO_TIMER; | |
571 | if (src->d_fieldmask & FS_DQ_RTBTIMER) | |
572 | dst->i_fieldmask |= QC_RT_SPC_TIMER; | |
573 | } | |
574 | ||
c411e5f6 CH |
575 | static int quota_setxquota(struct super_block *sb, int type, qid_t id, |
576 | void __user *addr) | |
577 | { | |
578 | struct fs_disk_quota fdq; | |
14bf61ff | 579 | struct qc_dqblk qdq; |
74a8a103 | 580 | struct kqid qid; |
c411e5f6 CH |
581 | |
582 | if (copy_from_user(&fdq, addr, sizeof(fdq))) | |
583 | return -EFAULT; | |
c472b432 | 584 | if (!sb->s_qcop->set_dqblk) |
f450d4fe | 585 | return -ENOSYS; |
74a8a103 | 586 | qid = make_kqid(current_user_ns(), type, id); |
d49d3762 | 587 | if (!qid_has_mapping(sb->s_user_ns, qid)) |
74a8a103 | 588 | return -EINVAL; |
c39fb53b | 589 | /* Are we actually setting timer / warning limits for all users? */ |
cfd4c70a | 590 | if (from_kqid(sb->s_user_ns, qid) == 0 && |
c39fb53b JK |
591 | fdq.d_fieldmask & (FS_DQ_WARNS_MASK | FS_DQ_TIMER_MASK)) { |
592 | struct qc_info qinfo; | |
593 | int ret; | |
594 | ||
595 | if (!sb->s_qcop->set_info) | |
596 | return -EINVAL; | |
597 | copy_qcinfo_from_xfs_dqblk(&qinfo, &fdq); | |
598 | ret = sb->s_qcop->set_info(sb, type, &qinfo); | |
599 | if (ret) | |
600 | return ret; | |
601 | /* These are already done */ | |
602 | fdq.d_fieldmask &= ~(FS_DQ_WARNS_MASK | FS_DQ_TIMER_MASK); | |
603 | } | |
14bf61ff JK |
604 | copy_from_xfs_dqblk(&qdq, &fdq); |
605 | return sb->s_qcop->set_dqblk(sb, qid, &qdq); | |
606 | } | |
607 | ||
608 | static void copy_to_xfs_dqblk(struct fs_disk_quota *dst, struct qc_dqblk *src, | |
609 | int type, qid_t id) | |
610 | { | |
611 | memset(dst, 0, sizeof(*dst)); | |
612 | dst->d_version = FS_DQUOT_VERSION; | |
613 | dst->d_id = id; | |
614 | if (type == USRQUOTA) | |
615 | dst->d_flags = FS_USER_QUOTA; | |
616 | else if (type == PRJQUOTA) | |
617 | dst->d_flags = FS_PROJ_QUOTA; | |
618 | else | |
619 | dst->d_flags = FS_GROUP_QUOTA; | |
620 | dst->d_blk_hardlimit = quota_btobb(src->d_spc_hardlimit); | |
621 | dst->d_blk_softlimit = quota_btobb(src->d_spc_softlimit); | |
622 | dst->d_ino_hardlimit = src->d_ino_hardlimit; | |
623 | dst->d_ino_softlimit = src->d_ino_softlimit; | |
624 | dst->d_bcount = quota_btobb(src->d_space); | |
625 | dst->d_icount = src->d_ino_count; | |
626 | dst->d_itimer = src->d_ino_timer; | |
627 | dst->d_btimer = src->d_spc_timer; | |
628 | dst->d_iwarns = src->d_ino_warns; | |
629 | dst->d_bwarns = src->d_spc_warns; | |
630 | dst->d_rtb_hardlimit = quota_btobb(src->d_rt_spc_hardlimit); | |
631 | dst->d_rtb_softlimit = quota_btobb(src->d_rt_spc_softlimit); | |
632 | dst->d_rtbcount = quota_btobb(src->d_rt_space); | |
633 | dst->d_rtbtimer = src->d_rt_spc_timer; | |
634 | dst->d_rtbwarns = src->d_rt_spc_warns; | |
c411e5f6 CH |
635 | } |
636 | ||
637 | static int quota_getxquota(struct super_block *sb, int type, qid_t id, | |
638 | void __user *addr) | |
639 | { | |
640 | struct fs_disk_quota fdq; | |
14bf61ff | 641 | struct qc_dqblk qdq; |
74a8a103 | 642 | struct kqid qid; |
c411e5f6 CH |
643 | int ret; |
644 | ||
b9b2dd36 | 645 | if (!sb->s_qcop->get_dqblk) |
f450d4fe | 646 | return -ENOSYS; |
74a8a103 | 647 | qid = make_kqid(current_user_ns(), type, id); |
d49d3762 | 648 | if (!qid_has_mapping(sb->s_user_ns, qid)) |
74a8a103 | 649 | return -EINVAL; |
14bf61ff JK |
650 | ret = sb->s_qcop->get_dqblk(sb, qid, &qdq); |
651 | if (ret) | |
652 | return ret; | |
653 | copy_to_xfs_dqblk(&fdq, &qdq, type, id); | |
654 | if (copy_to_user(addr, &fdq, sizeof(fdq))) | |
c411e5f6 CH |
655 | return -EFAULT; |
656 | return ret; | |
657 | } | |
658 | ||
8b375249 ES |
659 | /* |
660 | * Return quota for next active quota >= this id, if any exists, | |
ba58148b | 661 | * otherwise return -ENOENT via ->get_nextdqblk. |
8b375249 ES |
662 | */ |
663 | static int quota_getnextxquota(struct super_block *sb, int type, qid_t id, | |
664 | void __user *addr) | |
665 | { | |
666 | struct fs_disk_quota fdq; | |
667 | struct qc_dqblk qdq; | |
668 | struct kqid qid; | |
669 | qid_t id_out; | |
670 | int ret; | |
671 | ||
672 | if (!sb->s_qcop->get_nextdqblk) | |
673 | return -ENOSYS; | |
674 | qid = make_kqid(current_user_ns(), type, id); | |
d49d3762 | 675 | if (!qid_has_mapping(sb->s_user_ns, qid)) |
8b375249 ES |
676 | return -EINVAL; |
677 | ret = sb->s_qcop->get_nextdqblk(sb, &qid, &qdq); | |
678 | if (ret) | |
679 | return ret; | |
680 | id_out = from_kqid(current_user_ns(), qid); | |
681 | copy_to_xfs_dqblk(&fdq, &qdq, type, id_out); | |
682 | if (copy_to_user(addr, &fdq, sizeof(fdq))) | |
683 | return -EFAULT; | |
684 | return ret; | |
685 | } | |
686 | ||
9da93f9b ES |
687 | static int quota_rmxquota(struct super_block *sb, void __user *addr) |
688 | { | |
689 | __u32 flags; | |
690 | ||
691 | if (copy_from_user(&flags, addr, sizeof(flags))) | |
692 | return -EFAULT; | |
693 | if (!sb->s_qcop->rm_xquota) | |
694 | return -ENOSYS; | |
695 | return sb->s_qcop->rm_xquota(sb, flags); | |
696 | } | |
697 | ||
c411e5f6 CH |
698 | /* Copy parameters and call proper function */ |
699 | static int do_quotactl(struct super_block *sb, int type, int cmd, qid_t id, | |
8c54ca9c | 700 | void __user *addr, const struct path *path) |
c411e5f6 | 701 | { |
c988afb5 CH |
702 | int ret; |
703 | ||
704 | if (type >= (XQM_COMMAND(cmd) ? XQM_MAXQUOTAS : MAXQUOTAS)) | |
705 | return -EINVAL; | |
2c5f648a JK |
706 | /* |
707 | * Quota not supported on this fs? Check this before s_quota_types | |
708 | * since they needn't be set if quota is not supported at all. | |
709 | */ | |
c988afb5 CH |
710 | if (!sb->s_qcop) |
711 | return -ENOSYS; | |
2c5f648a JK |
712 | if (!(sb->s_quota_types & (1 << type))) |
713 | return -EINVAL; | |
c988afb5 CH |
714 | |
715 | ret = check_quotactl_permission(sb, type, cmd, id); | |
716 | if (ret < 0) | |
717 | return ret; | |
718 | ||
c411e5f6 CH |
719 | switch (cmd) { |
720 | case Q_QUOTAON: | |
3218a3ec | 721 | return quota_quotaon(sb, type, id, path); |
c411e5f6 | 722 | case Q_QUOTAOFF: |
d3b86324 | 723 | return quota_quotaoff(sb, type); |
c411e5f6 CH |
724 | case Q_GETFMT: |
725 | return quota_getfmt(sb, type, addr); | |
726 | case Q_GETINFO: | |
727 | return quota_getinfo(sb, type, addr); | |
728 | case Q_SETINFO: | |
729 | return quota_setinfo(sb, type, addr); | |
730 | case Q_GETQUOTA: | |
731 | return quota_getquota(sb, type, id, addr); | |
926132c0 ES |
732 | case Q_GETNEXTQUOTA: |
733 | return quota_getnextquota(sb, type, id, addr); | |
c411e5f6 CH |
734 | case Q_SETQUOTA: |
735 | return quota_setquota(sb, type, id, addr); | |
736 | case Q_SYNC: | |
6ae09575 CH |
737 | if (!sb->s_qcop->quota_sync) |
738 | return -ENOSYS; | |
ceed1723 | 739 | return sb->s_qcop->quota_sync(sb, type); |
c411e5f6 | 740 | case Q_XQUOTAON: |
38e478c4 | 741 | return quota_enable(sb, addr); |
c411e5f6 | 742 | case Q_XQUOTAOFF: |
38e478c4 | 743 | return quota_disable(sb, addr); |
9da93f9b ES |
744 | case Q_XQUOTARM: |
745 | return quota_rmxquota(sb, addr); | |
c411e5f6 CH |
746 | case Q_XGETQSTAT: |
747 | return quota_getxstate(sb, addr); | |
af30cb44 CS |
748 | case Q_XGETQSTATV: |
749 | return quota_getxstatev(sb, addr); | |
c411e5f6 CH |
750 | case Q_XSETQLIM: |
751 | return quota_setxquota(sb, type, id, addr); | |
752 | case Q_XGETQUOTA: | |
753 | return quota_getxquota(sb, type, id, addr); | |
8b375249 ES |
754 | case Q_XGETNEXTQUOTA: |
755 | return quota_getnextxquota(sb, type, id, addr); | |
c411e5f6 | 756 | case Q_XQUOTASYNC: |
bc98a42c | 757 | if (sb_rdonly(sb)) |
8c4e4acd | 758 | return -EROFS; |
4b217ed9 | 759 | /* XFS quotas are fully coherent now, making this call a noop */ |
8c4e4acd | 760 | return 0; |
c411e5f6 | 761 | default: |
f450d4fe | 762 | return -EINVAL; |
1da177e4 | 763 | } |
1da177e4 LT |
764 | } |
765 | ||
56df1278 LJ |
766 | #ifdef CONFIG_BLOCK |
767 | ||
dcdbed85 JK |
768 | /* Return 1 if 'cmd' will block on frozen filesystem */ |
769 | static int quotactl_cmd_write(int cmd) | |
770 | { | |
ccf370e4 JK |
771 | /* |
772 | * We cannot allow Q_GETQUOTA and Q_GETNEXTQUOTA without write access | |
773 | * as dquot_acquire() may allocate space for new structure and OCFS2 | |
774 | * needs to increment on-disk use count. | |
775 | */ | |
dcdbed85 JK |
776 | switch (cmd) { |
777 | case Q_GETFMT: | |
778 | case Q_GETINFO: | |
779 | case Q_SYNC: | |
780 | case Q_XGETQSTAT: | |
af30cb44 | 781 | case Q_XGETQSTATV: |
dcdbed85 | 782 | case Q_XGETQUOTA: |
8b375249 | 783 | case Q_XGETNEXTQUOTA: |
dcdbed85 JK |
784 | case Q_XQUOTASYNC: |
785 | return 0; | |
786 | } | |
787 | return 1; | |
788 | } | |
56df1278 LJ |
789 | #endif /* CONFIG_BLOCK */ |
790 | ||
7d6cd73d JK |
791 | /* Return true if quotactl command is manipulating quota on/off state */ |
792 | static bool quotactl_cmd_onoff(int cmd) | |
793 | { | |
794 | return (cmd == Q_QUOTAON) || (cmd == Q_QUOTAOFF); | |
795 | } | |
796 | ||
9361401e DH |
797 | /* |
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 | |
800 | */ | |
dcdbed85 | 801 | static struct super_block *quotactl_block(const char __user *special, int cmd) |
9361401e DH |
802 | { |
803 | #ifdef CONFIG_BLOCK | |
804 | struct block_device *bdev; | |
805 | struct super_block *sb; | |
91a27b2a | 806 | struct filename *tmp = getname(special); |
9361401e DH |
807 | |
808 | if (IS_ERR(tmp)) | |
e231c2ee | 809 | return ERR_CAST(tmp); |
91a27b2a | 810 | bdev = lookup_bdev(tmp->name); |
9361401e DH |
811 | putname(tmp); |
812 | if (IS_ERR(bdev)) | |
e231c2ee | 813 | return ERR_CAST(bdev); |
7d6cd73d JK |
814 | if (quotactl_cmd_onoff(cmd)) |
815 | sb = get_super_exclusive_thawed(bdev); | |
816 | else if (quotactl_cmd_write(cmd)) | |
dcdbed85 JK |
817 | sb = get_super_thawed(bdev); |
818 | else | |
819 | sb = get_super(bdev); | |
9361401e DH |
820 | bdput(bdev); |
821 | if (!sb) | |
822 | return ERR_PTR(-ENODEV); | |
823 | ||
824 | return sb; | |
825 | #else | |
826 | return ERR_PTR(-ENODEV); | |
827 | #endif | |
828 | } | |
829 | ||
1da177e4 LT |
830 | /* |
831 | * This is the system call interface. This communicates with | |
832 | * the user-level programs. Currently this only supports diskquota | |
833 | * calls. Maybe we need to add the process quotas etc. in the future, | |
834 | * but we probably should use rlimits for that. | |
835 | */ | |
3cdad428 HC |
836 | SYSCALL_DEFINE4(quotactl, unsigned int, cmd, const char __user *, special, |
837 | qid_t, id, void __user *, addr) | |
1da177e4 LT |
838 | { |
839 | uint cmds, type; | |
840 | struct super_block *sb = NULL; | |
f00c9e44 | 841 | struct path path, *pathp = NULL; |
1da177e4 LT |
842 | int ret; |
843 | ||
844 | cmds = cmd >> SUBCMDSHIFT; | |
845 | type = cmd & SUBCMDMASK; | |
846 | ||
6ae09575 CH |
847 | /* |
848 | * As a special case Q_SYNC can be called without a specific device. | |
849 | * It will iterate all superblocks that have quota enabled and call | |
850 | * the sync action on each of them. | |
851 | */ | |
852 | if (!special) { | |
853 | if (cmds == Q_SYNC) | |
854 | return quota_sync_all(type); | |
855 | return -ENODEV; | |
1da177e4 LT |
856 | } |
857 | ||
f00c9e44 JK |
858 | /* |
859 | * Path for quotaon has to be resolved before grabbing superblock | |
860 | * because that gets s_umount sem which is also possibly needed by path | |
861 | * resolution (think about autofs) and thus deadlocks could arise. | |
862 | */ | |
863 | if (cmds == Q_QUOTAON) { | |
815d405c | 864 | ret = user_path_at(AT_FDCWD, addr, LOOKUP_FOLLOW|LOOKUP_AUTOMOUNT, &path); |
f00c9e44 JK |
865 | if (ret) |
866 | pathp = ERR_PTR(ret); | |
867 | else | |
868 | pathp = &path; | |
869 | } | |
870 | ||
dcdbed85 | 871 | sb = quotactl_block(special, cmds); |
0aaa6188 JK |
872 | if (IS_ERR(sb)) { |
873 | ret = PTR_ERR(sb); | |
874 | goto out; | |
875 | } | |
6ae09575 | 876 | |
f00c9e44 | 877 | ret = do_quotactl(sb, type, cmds, id, addr, pathp); |
1da177e4 | 878 | |
7d6cd73d JK |
879 | if (!quotactl_cmd_onoff(cmds)) |
880 | drop_super(sb); | |
881 | else | |
882 | drop_super_exclusive(sb); | |
0aaa6188 | 883 | out: |
f00c9e44 JK |
884 | if (pathp && !IS_ERR(pathp)) |
885 | path_put(pathp); | |
1da177e4 LT |
886 | return ret; |
887 | } |