Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Quota code necessary even when VFS quota support is not compiled | |
3 | * into the kernel. The interesting stuff is over in dquot.c, here | |
4 | * we have symbols for initial quotactl(2) handling, the sysctl(2) | |
5 | * variables, etc - things needed even when quota support disabled. | |
6 | */ | |
7 | ||
8 | #include <linux/fs.h> | |
9 | #include <linux/namei.h> | |
10 | #include <linux/slab.h> | |
11 | #include <asm/current.h> | |
f3da9310 | 12 | #include <linux/uaccess.h> |
1da177e4 | 13 | #include <linux/kernel.h> |
1da177e4 LT |
14 | #include <linux/security.h> |
15 | #include <linux/syscalls.h> | |
16f7e0fe | 16 | #include <linux/capability.h> |
be586bab | 17 | #include <linux/quotaops.h> |
b716395e | 18 | #include <linux/types.h> |
8c4e4acd | 19 | #include <linux/writeback.h> |
1da177e4 | 20 | |
c988afb5 CH |
21 | static int check_quotactl_permission(struct super_block *sb, int type, int cmd, |
22 | qid_t id) | |
1da177e4 | 23 | { |
c988afb5 CH |
24 | switch (cmd) { |
25 | /* these commands do not require any special privilegues */ | |
26 | case Q_GETFMT: | |
27 | case Q_SYNC: | |
28 | case Q_GETINFO: | |
29 | case Q_XGETQSTAT: | |
af30cb44 | 30 | case Q_XGETQSTATV: |
c988afb5 CH |
31 | case Q_XQUOTASYNC: |
32 | break; | |
33 | /* allow to query information for dquots we "own" */ | |
34 | case Q_GETQUOTA: | |
35 | case Q_XGETQUOTA: | |
74a8a103 EB |
36 | if ((type == USRQUOTA && uid_eq(current_euid(), make_kuid(current_user_ns(), id))) || |
37 | (type == GRPQUOTA && in_egroup_p(make_kgid(current_user_ns(), id)))) | |
c988afb5 CH |
38 | break; |
39 | /*FALLTHROUGH*/ | |
40 | default: | |
1da177e4 LT |
41 | if (!capable(CAP_SYS_ADMIN)) |
42 | return -EPERM; | |
43 | } | |
44 | ||
c988afb5 | 45 | return security_quotactl(cmd, type, id, sb); |
1da177e4 LT |
46 | } |
47 | ||
01a05b33 AV |
48 | static void quota_sync_one(struct super_block *sb, void *arg) |
49 | { | |
2c5f648a JK |
50 | int type = *(int *)arg; |
51 | ||
52 | if (sb->s_qcop && sb->s_qcop->quota_sync && | |
53 | (sb->s_quota_types & (1 << type))) | |
54 | sb->s_qcop->quota_sync(sb, type); | |
01a05b33 AV |
55 | } |
56 | ||
6ae09575 | 57 | static int quota_sync_all(int type) |
1da177e4 | 58 | { |
6ae09575 CH |
59 | int ret; |
60 | ||
61 | if (type >= MAXQUOTAS) | |
62 | return -EINVAL; | |
63 | ret = security_quotactl(Q_SYNC, type, 0, NULL); | |
01a05b33 AV |
64 | if (!ret) |
65 | iterate_supers(quota_sync_one, &type); | |
66 | return ret; | |
1da177e4 LT |
67 | } |
68 | ||
d3b86324 JK |
69 | unsigned int qtype_enforce_flag(int type) |
70 | { | |
71 | switch (type) { | |
72 | case USRQUOTA: | |
73 | return FS_QUOTA_UDQ_ENFD; | |
74 | case GRPQUOTA: | |
75 | return FS_QUOTA_GDQ_ENFD; | |
76 | case PRJQUOTA: | |
77 | return FS_QUOTA_PDQ_ENFD; | |
78 | } | |
79 | return 0; | |
80 | } | |
81 | ||
3218a3ec | 82 | static int quota_quotaon(struct super_block *sb, int type, qid_t id, |
f00c9e44 | 83 | struct path *path) |
1da177e4 | 84 | { |
aaa3daed | 85 | if (!sb->s_qcop->quota_on && !sb->s_qcop->quota_enable) |
f00c9e44 | 86 | return -ENOSYS; |
d3b86324 JK |
87 | if (sb->s_qcop->quota_enable) |
88 | return sb->s_qcop->quota_enable(sb, qtype_enforce_flag(type)); | |
f00c9e44 JK |
89 | if (IS_ERR(path)) |
90 | return PTR_ERR(path); | |
91 | return sb->s_qcop->quota_on(sb, type, id, path); | |
c411e5f6 | 92 | } |
1da177e4 | 93 | |
d3b86324 JK |
94 | static int quota_quotaoff(struct super_block *sb, int type) |
95 | { | |
96 | if (!sb->s_qcop->quota_off && !sb->s_qcop->quota_disable) | |
97 | return -ENOSYS; | |
98 | if (sb->s_qcop->quota_disable) | |
99 | return sb->s_qcop->quota_disable(sb, qtype_enforce_flag(type)); | |
100 | return sb->s_qcop->quota_off(sb, type); | |
101 | } | |
102 | ||
c411e5f6 CH |
103 | static int quota_getfmt(struct super_block *sb, int type, void __user *addr) |
104 | { | |
105 | __u32 fmt; | |
1da177e4 | 106 | |
606cdcca | 107 | mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); |
c411e5f6 | 108 | if (!sb_has_quota_active(sb, type)) { |
606cdcca | 109 | mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); |
c411e5f6 CH |
110 | return -ESRCH; |
111 | } | |
112 | fmt = sb_dqopt(sb)->info[type].dqi_format->qf_fmt_id; | |
606cdcca | 113 | mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); |
c411e5f6 CH |
114 | if (copy_to_user(addr, &fmt, sizeof(fmt))) |
115 | return -EFAULT; | |
116 | return 0; | |
117 | } | |
1da177e4 | 118 | |
c411e5f6 CH |
119 | static int quota_getinfo(struct super_block *sb, int type, void __user *addr) |
120 | { | |
0a240339 JK |
121 | struct qc_state state; |
122 | struct qc_type_state *tstate; | |
123 | struct if_dqinfo uinfo; | |
c411e5f6 | 124 | int ret; |
1da177e4 | 125 | |
0a240339 JK |
126 | /* This checks whether qc_state has enough entries... */ |
127 | BUILD_BUG_ON(MAXQUOTAS > XQM_MAXQUOTAS); | |
128 | if (!sb->s_qcop->get_state) | |
f450d4fe | 129 | return -ENOSYS; |
0a240339 JK |
130 | ret = sb->s_qcop->get_state(sb, &state); |
131 | if (ret) | |
132 | return ret; | |
133 | tstate = state.s_state + type; | |
134 | if (!(tstate->flags & QCI_ACCT_ENABLED)) | |
135 | return -ESRCH; | |
136 | memset(&uinfo, 0, sizeof(uinfo)); | |
137 | uinfo.dqi_bgrace = tstate->spc_timelimit; | |
138 | uinfo.dqi_igrace = tstate->ino_timelimit; | |
139 | if (tstate->flags & QCI_SYSFILE) | |
140 | uinfo.dqi_flags |= DQF_SYS_FILE; | |
141 | if (tstate->flags & QCI_ROOT_SQUASH) | |
142 | uinfo.dqi_flags |= DQF_ROOT_SQUASH; | |
143 | uinfo.dqi_valid = IIF_ALL; | |
72d4d0e4 | 144 | if (copy_to_user(addr, &uinfo, sizeof(uinfo))) |
c411e5f6 | 145 | return -EFAULT; |
72d4d0e4 | 146 | return 0; |
c411e5f6 | 147 | } |
1da177e4 | 148 | |
c411e5f6 CH |
149 | static int quota_setinfo(struct super_block *sb, int type, void __user *addr) |
150 | { | |
151 | struct if_dqinfo info; | |
5eacb2ac | 152 | struct qc_info qinfo; |
1da177e4 | 153 | |
c411e5f6 CH |
154 | if (copy_from_user(&info, addr, sizeof(info))) |
155 | return -EFAULT; | |
f450d4fe CH |
156 | if (!sb->s_qcop->set_info) |
157 | return -ENOSYS; | |
5eacb2ac JK |
158 | if (info.dqi_valid & ~(IIF_FLAGS | IIF_BGRACE | IIF_IGRACE)) |
159 | return -EINVAL; | |
160 | memset(&qinfo, 0, sizeof(qinfo)); | |
161 | if (info.dqi_valid & IIF_FLAGS) { | |
162 | if (info.dqi_flags & ~DQF_SETINFO_MASK) | |
163 | return -EINVAL; | |
164 | if (info.dqi_flags & DQF_ROOT_SQUASH) | |
165 | qinfo.i_flags |= QCI_ROOT_SQUASH; | |
166 | qinfo.i_fieldmask |= QC_FLAGS; | |
167 | } | |
168 | if (info.dqi_valid & IIF_BGRACE) { | |
169 | qinfo.i_spc_timelimit = info.dqi_bgrace; | |
170 | qinfo.i_fieldmask |= QC_SPC_TIMER; | |
171 | } | |
172 | if (info.dqi_valid & IIF_IGRACE) { | |
173 | qinfo.i_ino_timelimit = info.dqi_igrace; | |
174 | qinfo.i_fieldmask |= QC_INO_TIMER; | |
175 | } | |
176 | return sb->s_qcop->set_info(sb, type, &qinfo); | |
c411e5f6 CH |
177 | } |
178 | ||
14bf61ff JK |
179 | static inline qsize_t qbtos(qsize_t blocks) |
180 | { | |
181 | return blocks << QIF_DQBLKSIZE_BITS; | |
182 | } | |
183 | ||
184 | static inline qsize_t stoqb(qsize_t space) | |
185 | { | |
186 | return (space + QIF_DQBLKSIZE - 1) >> QIF_DQBLKSIZE_BITS; | |
187 | } | |
188 | ||
189 | static void copy_to_if_dqblk(struct if_dqblk *dst, struct qc_dqblk *src) | |
b9b2dd36 | 190 | { |
18da65e7 | 191 | memset(dst, 0, sizeof(*dst)); |
14bf61ff JK |
192 | dst->dqb_bhardlimit = stoqb(src->d_spc_hardlimit); |
193 | dst->dqb_bsoftlimit = stoqb(src->d_spc_softlimit); | |
194 | dst->dqb_curspace = src->d_space; | |
b9b2dd36 CH |
195 | dst->dqb_ihardlimit = src->d_ino_hardlimit; |
196 | dst->dqb_isoftlimit = src->d_ino_softlimit; | |
14bf61ff JK |
197 | dst->dqb_curinodes = src->d_ino_count; |
198 | dst->dqb_btime = src->d_spc_timer; | |
199 | dst->dqb_itime = src->d_ino_timer; | |
b9b2dd36 CH |
200 | dst->dqb_valid = QIF_ALL; |
201 | } | |
202 | ||
c411e5f6 CH |
203 | static int quota_getquota(struct super_block *sb, int type, qid_t id, |
204 | void __user *addr) | |
205 | { | |
74a8a103 | 206 | struct kqid qid; |
14bf61ff | 207 | struct qc_dqblk fdq; |
c411e5f6 CH |
208 | struct if_dqblk idq; |
209 | int ret; | |
210 | ||
f450d4fe CH |
211 | if (!sb->s_qcop->get_dqblk) |
212 | return -ENOSYS; | |
74a8a103 EB |
213 | qid = make_kqid(current_user_ns(), type, id); |
214 | if (!qid_valid(qid)) | |
215 | return -EINVAL; | |
216 | ret = sb->s_qcop->get_dqblk(sb, qid, &fdq); | |
c411e5f6 CH |
217 | if (ret) |
218 | return ret; | |
b9b2dd36 | 219 | copy_to_if_dqblk(&idq, &fdq); |
c411e5f6 CH |
220 | if (copy_to_user(addr, &idq, sizeof(idq))) |
221 | return -EFAULT; | |
222 | return 0; | |
223 | } | |
224 | ||
926132c0 ES |
225 | /* |
226 | * Return quota for next active quota >= this id, if any exists, | |
ba58148b | 227 | * otherwise return -ENOENT via ->get_nextdqblk |
926132c0 ES |
228 | */ |
229 | static int quota_getnextquota(struct super_block *sb, int type, qid_t id, | |
230 | void __user *addr) | |
231 | { | |
232 | struct kqid qid; | |
233 | struct qc_dqblk fdq; | |
234 | struct if_nextdqblk idq; | |
235 | int ret; | |
236 | ||
237 | if (!sb->s_qcop->get_nextdqblk) | |
238 | return -ENOSYS; | |
239 | qid = make_kqid(current_user_ns(), type, id); | |
240 | if (!qid_valid(qid)) | |
241 | return -EINVAL; | |
242 | ret = sb->s_qcop->get_nextdqblk(sb, &qid, &fdq); | |
243 | if (ret) | |
244 | return ret; | |
245 | /* struct if_nextdqblk is a superset of struct if_dqblk */ | |
246 | copy_to_if_dqblk((struct if_dqblk *)&idq, &fdq); | |
247 | idq.dqb_id = from_kqid(current_user_ns(), qid); | |
248 | if (copy_to_user(addr, &idq, sizeof(idq))) | |
249 | return -EFAULT; | |
250 | return 0; | |
251 | } | |
252 | ||
14bf61ff | 253 | static void copy_from_if_dqblk(struct qc_dqblk *dst, struct if_dqblk *src) |
c472b432 | 254 | { |
14bf61ff JK |
255 | dst->d_spc_hardlimit = qbtos(src->dqb_bhardlimit); |
256 | dst->d_spc_softlimit = qbtos(src->dqb_bsoftlimit); | |
257 | dst->d_space = src->dqb_curspace; | |
c472b432 CH |
258 | dst->d_ino_hardlimit = src->dqb_ihardlimit; |
259 | dst->d_ino_softlimit = src->dqb_isoftlimit; | |
14bf61ff JK |
260 | dst->d_ino_count = src->dqb_curinodes; |
261 | dst->d_spc_timer = src->dqb_btime; | |
262 | dst->d_ino_timer = src->dqb_itime; | |
c472b432 CH |
263 | |
264 | dst->d_fieldmask = 0; | |
265 | if (src->dqb_valid & QIF_BLIMITS) | |
14bf61ff | 266 | dst->d_fieldmask |= QC_SPC_SOFT | QC_SPC_HARD; |
c472b432 | 267 | if (src->dqb_valid & QIF_SPACE) |
14bf61ff | 268 | dst->d_fieldmask |= QC_SPACE; |
c472b432 | 269 | if (src->dqb_valid & QIF_ILIMITS) |
14bf61ff | 270 | dst->d_fieldmask |= QC_INO_SOFT | QC_INO_HARD; |
c472b432 | 271 | if (src->dqb_valid & QIF_INODES) |
14bf61ff | 272 | dst->d_fieldmask |= QC_INO_COUNT; |
c472b432 | 273 | if (src->dqb_valid & QIF_BTIME) |
14bf61ff | 274 | dst->d_fieldmask |= QC_SPC_TIMER; |
c472b432 | 275 | if (src->dqb_valid & QIF_ITIME) |
14bf61ff | 276 | dst->d_fieldmask |= QC_INO_TIMER; |
c472b432 CH |
277 | } |
278 | ||
c411e5f6 CH |
279 | static int quota_setquota(struct super_block *sb, int type, qid_t id, |
280 | void __user *addr) | |
281 | { | |
14bf61ff | 282 | struct qc_dqblk fdq; |
c411e5f6 | 283 | struct if_dqblk idq; |
74a8a103 | 284 | struct kqid qid; |
c411e5f6 CH |
285 | |
286 | if (copy_from_user(&idq, addr, sizeof(idq))) | |
287 | return -EFAULT; | |
f450d4fe CH |
288 | if (!sb->s_qcop->set_dqblk) |
289 | return -ENOSYS; | |
74a8a103 EB |
290 | qid = make_kqid(current_user_ns(), type, id); |
291 | if (!qid_valid(qid)) | |
292 | return -EINVAL; | |
c472b432 | 293 | copy_from_if_dqblk(&fdq, &idq); |
74a8a103 | 294 | return sb->s_qcop->set_dqblk(sb, qid, &fdq); |
c411e5f6 CH |
295 | } |
296 | ||
38e478c4 | 297 | static int quota_enable(struct super_block *sb, void __user *addr) |
c411e5f6 CH |
298 | { |
299 | __u32 flags; | |
300 | ||
301 | if (copy_from_user(&flags, addr, sizeof(flags))) | |
302 | return -EFAULT; | |
38e478c4 | 303 | if (!sb->s_qcop->quota_enable) |
f450d4fe | 304 | return -ENOSYS; |
38e478c4 JK |
305 | return sb->s_qcop->quota_enable(sb, flags); |
306 | } | |
307 | ||
308 | static int quota_disable(struct super_block *sb, void __user *addr) | |
309 | { | |
310 | __u32 flags; | |
311 | ||
312 | if (copy_from_user(&flags, addr, sizeof(flags))) | |
313 | return -EFAULT; | |
314 | if (!sb->s_qcop->quota_disable) | |
315 | return -ENOSYS; | |
316 | return sb->s_qcop->quota_disable(sb, flags); | |
c411e5f6 CH |
317 | } |
318 | ||
bc230e4a JK |
319 | static int quota_state_to_flags(struct qc_state *state) |
320 | { | |
321 | int flags = 0; | |
322 | ||
323 | if (state->s_state[USRQUOTA].flags & QCI_ACCT_ENABLED) | |
324 | flags |= FS_QUOTA_UDQ_ACCT; | |
325 | if (state->s_state[USRQUOTA].flags & QCI_LIMITS_ENFORCED) | |
326 | flags |= FS_QUOTA_UDQ_ENFD; | |
327 | if (state->s_state[GRPQUOTA].flags & QCI_ACCT_ENABLED) | |
328 | flags |= FS_QUOTA_GDQ_ACCT; | |
329 | if (state->s_state[GRPQUOTA].flags & QCI_LIMITS_ENFORCED) | |
330 | flags |= FS_QUOTA_GDQ_ENFD; | |
331 | if (state->s_state[PRJQUOTA].flags & QCI_ACCT_ENABLED) | |
332 | flags |= FS_QUOTA_PDQ_ACCT; | |
333 | if (state->s_state[PRJQUOTA].flags & QCI_LIMITS_ENFORCED) | |
334 | flags |= FS_QUOTA_PDQ_ENFD; | |
335 | return flags; | |
336 | } | |
337 | ||
338 | static int quota_getstate(struct super_block *sb, struct fs_quota_stat *fqs) | |
339 | { | |
340 | int type; | |
341 | struct qc_state state; | |
342 | int ret; | |
343 | ||
344 | ret = sb->s_qcop->get_state(sb, &state); | |
345 | if (ret < 0) | |
346 | return ret; | |
347 | ||
348 | memset(fqs, 0, sizeof(*fqs)); | |
349 | fqs->qs_version = FS_QSTAT_VERSION; | |
350 | fqs->qs_flags = quota_state_to_flags(&state); | |
351 | /* No quota enabled? */ | |
352 | if (!fqs->qs_flags) | |
353 | return -ENOSYS; | |
354 | fqs->qs_incoredqs = state.s_incoredqs; | |
355 | /* | |
356 | * GETXSTATE quotactl has space for just one set of time limits so | |
357 | * report them for the first enabled quota type | |
358 | */ | |
359 | for (type = 0; type < XQM_MAXQUOTAS; type++) | |
360 | if (state.s_state[type].flags & QCI_ACCT_ENABLED) | |
361 | break; | |
362 | BUG_ON(type == XQM_MAXQUOTAS); | |
363 | fqs->qs_btimelimit = state.s_state[type].spc_timelimit; | |
364 | fqs->qs_itimelimit = state.s_state[type].ino_timelimit; | |
365 | fqs->qs_rtbtimelimit = state.s_state[type].rt_spc_timelimit; | |
366 | fqs->qs_bwarnlimit = state.s_state[type].spc_warnlimit; | |
367 | fqs->qs_iwarnlimit = state.s_state[type].ino_warnlimit; | |
368 | if (state.s_state[USRQUOTA].flags & QCI_ACCT_ENABLED) { | |
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 | } | |
373 | if (state.s_state[GRPQUOTA].flags & QCI_ACCT_ENABLED) { | |
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 | } | |
378 | if (state.s_state[PRJQUOTA].flags & QCI_ACCT_ENABLED) { | |
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 | ||
414 | ret = sb->s_qcop->get_state(sb, &state); | |
415 | if (ret < 0) | |
416 | return ret; | |
417 | ||
418 | memset(fqs, 0, sizeof(*fqs)); | |
419 | fqs->qs_version = FS_QSTAT_VERSION; | |
420 | fqs->qs_flags = quota_state_to_flags(&state); | |
421 | /* No quota enabled? */ | |
422 | if (!fqs->qs_flags) | |
423 | return -ENOSYS; | |
424 | fqs->qs_incoredqs = state.s_incoredqs; | |
425 | /* | |
426 | * GETXSTATV quotactl has space for just one set of time limits so | |
427 | * report them for the first enabled quota type | |
428 | */ | |
429 | for (type = 0; type < XQM_MAXQUOTAS; type++) | |
430 | if (state.s_state[type].flags & QCI_ACCT_ENABLED) | |
431 | break; | |
432 | BUG_ON(type == XQM_MAXQUOTAS); | |
433 | fqs->qs_btimelimit = state.s_state[type].spc_timelimit; | |
434 | fqs->qs_itimelimit = state.s_state[type].ino_timelimit; | |
435 | fqs->qs_rtbtimelimit = state.s_state[type].rt_spc_timelimit; | |
436 | fqs->qs_bwarnlimit = state.s_state[type].spc_warnlimit; | |
437 | fqs->qs_iwarnlimit = state.s_state[type].ino_warnlimit; | |
438 | if (state.s_state[USRQUOTA].flags & QCI_ACCT_ENABLED) { | |
439 | fqs->qs_uquota.qfs_ino = state.s_state[USRQUOTA].ino; | |
440 | fqs->qs_uquota.qfs_nblks = state.s_state[USRQUOTA].blocks; | |
441 | fqs->qs_uquota.qfs_nextents = state.s_state[USRQUOTA].nextents; | |
442 | } | |
443 | if (state.s_state[GRPQUOTA].flags & QCI_ACCT_ENABLED) { | |
444 | fqs->qs_gquota.qfs_ino = state.s_state[GRPQUOTA].ino; | |
445 | fqs->qs_gquota.qfs_nblks = state.s_state[GRPQUOTA].blocks; | |
446 | fqs->qs_gquota.qfs_nextents = state.s_state[GRPQUOTA].nextents; | |
447 | } | |
448 | if (state.s_state[PRJQUOTA].flags & QCI_ACCT_ENABLED) { | |
449 | fqs->qs_pquota.qfs_ino = state.s_state[PRJQUOTA].ino; | |
450 | fqs->qs_pquota.qfs_nblks = state.s_state[PRJQUOTA].blocks; | |
451 | fqs->qs_pquota.qfs_nextents = state.s_state[PRJQUOTA].nextents; | |
452 | } | |
453 | return 0; | |
454 | } | |
455 | ||
af30cb44 CS |
456 | static int quota_getxstatev(struct super_block *sb, void __user *addr) |
457 | { | |
458 | struct fs_quota_statv fqs; | |
459 | int ret; | |
460 | ||
59b6ba69 | 461 | if (!sb->s_qcop->get_state) |
af30cb44 CS |
462 | return -ENOSYS; |
463 | ||
464 | memset(&fqs, 0, sizeof(fqs)); | |
465 | if (copy_from_user(&fqs, addr, 1)) /* Just read qs_version */ | |
466 | return -EFAULT; | |
467 | ||
468 | /* If this kernel doesn't support user specified version, fail */ | |
469 | switch (fqs.qs_version) { | |
470 | case FS_QSTATV_VERSION1: | |
471 | break; | |
472 | default: | |
473 | return -EINVAL; | |
474 | } | |
59b6ba69 | 475 | ret = quota_getstatev(sb, &fqs); |
af30cb44 CS |
476 | if (!ret && copy_to_user(addr, &fqs, sizeof(fqs))) |
477 | return -EFAULT; | |
478 | return ret; | |
479 | } | |
480 | ||
14bf61ff JK |
481 | /* |
482 | * XFS defines BBTOB and BTOBB macros inside fs/xfs/ and we cannot move them | |
483 | * out of there as xfsprogs rely on definitions being in that header file. So | |
484 | * just define same functions here for quota purposes. | |
485 | */ | |
486 | #define XFS_BB_SHIFT 9 | |
487 | ||
488 | static inline u64 quota_bbtob(u64 blocks) | |
489 | { | |
490 | return blocks << XFS_BB_SHIFT; | |
491 | } | |
492 | ||
493 | static inline u64 quota_btobb(u64 bytes) | |
494 | { | |
495 | return (bytes + (1 << XFS_BB_SHIFT) - 1) >> XFS_BB_SHIFT; | |
496 | } | |
497 | ||
498 | static void copy_from_xfs_dqblk(struct qc_dqblk *dst, struct fs_disk_quota *src) | |
499 | { | |
500 | dst->d_spc_hardlimit = quota_bbtob(src->d_blk_hardlimit); | |
501 | dst->d_spc_softlimit = quota_bbtob(src->d_blk_softlimit); | |
502 | dst->d_ino_hardlimit = src->d_ino_hardlimit; | |
503 | dst->d_ino_softlimit = src->d_ino_softlimit; | |
504 | dst->d_space = quota_bbtob(src->d_bcount); | |
505 | dst->d_ino_count = src->d_icount; | |
506 | dst->d_ino_timer = src->d_itimer; | |
507 | dst->d_spc_timer = src->d_btimer; | |
508 | dst->d_ino_warns = src->d_iwarns; | |
509 | dst->d_spc_warns = src->d_bwarns; | |
510 | dst->d_rt_spc_hardlimit = quota_bbtob(src->d_rtb_hardlimit); | |
511 | dst->d_rt_spc_softlimit = quota_bbtob(src->d_rtb_softlimit); | |
512 | dst->d_rt_space = quota_bbtob(src->d_rtbcount); | |
513 | dst->d_rt_spc_timer = src->d_rtbtimer; | |
514 | dst->d_rt_spc_warns = src->d_rtbwarns; | |
515 | dst->d_fieldmask = 0; | |
516 | if (src->d_fieldmask & FS_DQ_ISOFT) | |
517 | dst->d_fieldmask |= QC_INO_SOFT; | |
518 | if (src->d_fieldmask & FS_DQ_IHARD) | |
519 | dst->d_fieldmask |= QC_INO_HARD; | |
520 | if (src->d_fieldmask & FS_DQ_BSOFT) | |
521 | dst->d_fieldmask |= QC_SPC_SOFT; | |
522 | if (src->d_fieldmask & FS_DQ_BHARD) | |
523 | dst->d_fieldmask |= QC_SPC_HARD; | |
524 | if (src->d_fieldmask & FS_DQ_RTBSOFT) | |
525 | dst->d_fieldmask |= QC_RT_SPC_SOFT; | |
526 | if (src->d_fieldmask & FS_DQ_RTBHARD) | |
527 | dst->d_fieldmask |= QC_RT_SPC_HARD; | |
528 | if (src->d_fieldmask & FS_DQ_BTIMER) | |
529 | dst->d_fieldmask |= QC_SPC_TIMER; | |
530 | if (src->d_fieldmask & FS_DQ_ITIMER) | |
531 | dst->d_fieldmask |= QC_INO_TIMER; | |
532 | if (src->d_fieldmask & FS_DQ_RTBTIMER) | |
533 | dst->d_fieldmask |= QC_RT_SPC_TIMER; | |
534 | if (src->d_fieldmask & FS_DQ_BWARNS) | |
535 | dst->d_fieldmask |= QC_SPC_WARNS; | |
536 | if (src->d_fieldmask & FS_DQ_IWARNS) | |
537 | dst->d_fieldmask |= QC_INO_WARNS; | |
538 | if (src->d_fieldmask & FS_DQ_RTBWARNS) | |
539 | dst->d_fieldmask |= QC_RT_SPC_WARNS; | |
540 | if (src->d_fieldmask & FS_DQ_BCOUNT) | |
541 | dst->d_fieldmask |= QC_SPACE; | |
542 | if (src->d_fieldmask & FS_DQ_ICOUNT) | |
543 | dst->d_fieldmask |= QC_INO_COUNT; | |
544 | if (src->d_fieldmask & FS_DQ_RTBCOUNT) | |
545 | dst->d_fieldmask |= QC_RT_SPACE; | |
546 | } | |
547 | ||
c39fb53b JK |
548 | static void copy_qcinfo_from_xfs_dqblk(struct qc_info *dst, |
549 | struct fs_disk_quota *src) | |
550 | { | |
551 | memset(dst, 0, sizeof(*dst)); | |
552 | dst->i_spc_timelimit = src->d_btimer; | |
553 | dst->i_ino_timelimit = src->d_itimer; | |
554 | dst->i_rt_spc_timelimit = src->d_rtbtimer; | |
555 | dst->i_ino_warnlimit = src->d_iwarns; | |
556 | dst->i_spc_warnlimit = src->d_bwarns; | |
557 | dst->i_rt_spc_warnlimit = src->d_rtbwarns; | |
558 | if (src->d_fieldmask & FS_DQ_BWARNS) | |
559 | dst->i_fieldmask |= QC_SPC_WARNS; | |
560 | if (src->d_fieldmask & FS_DQ_IWARNS) | |
561 | dst->i_fieldmask |= QC_INO_WARNS; | |
562 | if (src->d_fieldmask & FS_DQ_RTBWARNS) | |
563 | dst->i_fieldmask |= QC_RT_SPC_WARNS; | |
564 | if (src->d_fieldmask & FS_DQ_BTIMER) | |
565 | dst->i_fieldmask |= QC_SPC_TIMER; | |
566 | if (src->d_fieldmask & FS_DQ_ITIMER) | |
567 | dst->i_fieldmask |= QC_INO_TIMER; | |
568 | if (src->d_fieldmask & FS_DQ_RTBTIMER) | |
569 | dst->i_fieldmask |= QC_RT_SPC_TIMER; | |
570 | } | |
571 | ||
c411e5f6 CH |
572 | static int quota_setxquota(struct super_block *sb, int type, qid_t id, |
573 | void __user *addr) | |
574 | { | |
575 | struct fs_disk_quota fdq; | |
14bf61ff | 576 | struct qc_dqblk qdq; |
74a8a103 | 577 | struct kqid qid; |
c411e5f6 CH |
578 | |
579 | if (copy_from_user(&fdq, addr, sizeof(fdq))) | |
580 | return -EFAULT; | |
c472b432 | 581 | if (!sb->s_qcop->set_dqblk) |
f450d4fe | 582 | return -ENOSYS; |
74a8a103 EB |
583 | qid = make_kqid(current_user_ns(), type, id); |
584 | if (!qid_valid(qid)) | |
585 | return -EINVAL; | |
c39fb53b JK |
586 | /* Are we actually setting timer / warning limits for all users? */ |
587 | if (from_kqid(&init_user_ns, qid) == 0 && | |
588 | fdq.d_fieldmask & (FS_DQ_WARNS_MASK | FS_DQ_TIMER_MASK)) { | |
589 | struct qc_info qinfo; | |
590 | int ret; | |
591 | ||
592 | if (!sb->s_qcop->set_info) | |
593 | return -EINVAL; | |
594 | copy_qcinfo_from_xfs_dqblk(&qinfo, &fdq); | |
595 | ret = sb->s_qcop->set_info(sb, type, &qinfo); | |
596 | if (ret) | |
597 | return ret; | |
598 | /* These are already done */ | |
599 | fdq.d_fieldmask &= ~(FS_DQ_WARNS_MASK | FS_DQ_TIMER_MASK); | |
600 | } | |
14bf61ff JK |
601 | copy_from_xfs_dqblk(&qdq, &fdq); |
602 | return sb->s_qcop->set_dqblk(sb, qid, &qdq); | |
603 | } | |
604 | ||
605 | static void copy_to_xfs_dqblk(struct fs_disk_quota *dst, struct qc_dqblk *src, | |
606 | int type, qid_t id) | |
607 | { | |
608 | memset(dst, 0, sizeof(*dst)); | |
609 | dst->d_version = FS_DQUOT_VERSION; | |
610 | dst->d_id = id; | |
611 | if (type == USRQUOTA) | |
612 | dst->d_flags = FS_USER_QUOTA; | |
613 | else if (type == PRJQUOTA) | |
614 | dst->d_flags = FS_PROJ_QUOTA; | |
615 | else | |
616 | dst->d_flags = FS_GROUP_QUOTA; | |
617 | dst->d_blk_hardlimit = quota_btobb(src->d_spc_hardlimit); | |
618 | dst->d_blk_softlimit = quota_btobb(src->d_spc_softlimit); | |
619 | dst->d_ino_hardlimit = src->d_ino_hardlimit; | |
620 | dst->d_ino_softlimit = src->d_ino_softlimit; | |
621 | dst->d_bcount = quota_btobb(src->d_space); | |
622 | dst->d_icount = src->d_ino_count; | |
623 | dst->d_itimer = src->d_ino_timer; | |
624 | dst->d_btimer = src->d_spc_timer; | |
625 | dst->d_iwarns = src->d_ino_warns; | |
626 | dst->d_bwarns = src->d_spc_warns; | |
627 | dst->d_rtb_hardlimit = quota_btobb(src->d_rt_spc_hardlimit); | |
628 | dst->d_rtb_softlimit = quota_btobb(src->d_rt_spc_softlimit); | |
629 | dst->d_rtbcount = quota_btobb(src->d_rt_space); | |
630 | dst->d_rtbtimer = src->d_rt_spc_timer; | |
631 | dst->d_rtbwarns = src->d_rt_spc_warns; | |
c411e5f6 CH |
632 | } |
633 | ||
634 | static int quota_getxquota(struct super_block *sb, int type, qid_t id, | |
635 | void __user *addr) | |
636 | { | |
637 | struct fs_disk_quota fdq; | |
14bf61ff | 638 | struct qc_dqblk qdq; |
74a8a103 | 639 | struct kqid qid; |
c411e5f6 CH |
640 | int ret; |
641 | ||
b9b2dd36 | 642 | if (!sb->s_qcop->get_dqblk) |
f450d4fe | 643 | return -ENOSYS; |
74a8a103 EB |
644 | qid = make_kqid(current_user_ns(), type, id); |
645 | if (!qid_valid(qid)) | |
646 | return -EINVAL; | |
14bf61ff JK |
647 | ret = sb->s_qcop->get_dqblk(sb, qid, &qdq); |
648 | if (ret) | |
649 | return ret; | |
650 | copy_to_xfs_dqblk(&fdq, &qdq, type, id); | |
651 | if (copy_to_user(addr, &fdq, sizeof(fdq))) | |
c411e5f6 CH |
652 | return -EFAULT; |
653 | return ret; | |
654 | } | |
655 | ||
8b375249 ES |
656 | /* |
657 | * Return quota for next active quota >= this id, if any exists, | |
ba58148b | 658 | * otherwise return -ENOENT via ->get_nextdqblk. |
8b375249 ES |
659 | */ |
660 | static int quota_getnextxquota(struct super_block *sb, int type, qid_t id, | |
661 | void __user *addr) | |
662 | { | |
663 | struct fs_disk_quota fdq; | |
664 | struct qc_dqblk qdq; | |
665 | struct kqid qid; | |
666 | qid_t id_out; | |
667 | int ret; | |
668 | ||
669 | if (!sb->s_qcop->get_nextdqblk) | |
670 | return -ENOSYS; | |
671 | qid = make_kqid(current_user_ns(), type, id); | |
672 | if (!qid_valid(qid)) | |
673 | return -EINVAL; | |
674 | ret = sb->s_qcop->get_nextdqblk(sb, &qid, &qdq); | |
675 | if (ret) | |
676 | return ret; | |
677 | id_out = from_kqid(current_user_ns(), qid); | |
678 | copy_to_xfs_dqblk(&fdq, &qdq, type, id_out); | |
679 | if (copy_to_user(addr, &fdq, sizeof(fdq))) | |
680 | return -EFAULT; | |
681 | return ret; | |
682 | } | |
683 | ||
9da93f9b ES |
684 | static int quota_rmxquota(struct super_block *sb, void __user *addr) |
685 | { | |
686 | __u32 flags; | |
687 | ||
688 | if (copy_from_user(&flags, addr, sizeof(flags))) | |
689 | return -EFAULT; | |
690 | if (!sb->s_qcop->rm_xquota) | |
691 | return -ENOSYS; | |
692 | return sb->s_qcop->rm_xquota(sb, flags); | |
693 | } | |
694 | ||
c411e5f6 CH |
695 | /* Copy parameters and call proper function */ |
696 | static int do_quotactl(struct super_block *sb, int type, int cmd, qid_t id, | |
f00c9e44 | 697 | void __user *addr, struct path *path) |
c411e5f6 | 698 | { |
c988afb5 CH |
699 | int ret; |
700 | ||
701 | if (type >= (XQM_COMMAND(cmd) ? XQM_MAXQUOTAS : MAXQUOTAS)) | |
702 | return -EINVAL; | |
2c5f648a JK |
703 | /* |
704 | * Quota not supported on this fs? Check this before s_quota_types | |
705 | * since they needn't be set if quota is not supported at all. | |
706 | */ | |
c988afb5 CH |
707 | if (!sb->s_qcop) |
708 | return -ENOSYS; | |
2c5f648a JK |
709 | if (!(sb->s_quota_types & (1 << type))) |
710 | return -EINVAL; | |
c988afb5 CH |
711 | |
712 | ret = check_quotactl_permission(sb, type, cmd, id); | |
713 | if (ret < 0) | |
714 | return ret; | |
715 | ||
c411e5f6 CH |
716 | switch (cmd) { |
717 | case Q_QUOTAON: | |
3218a3ec | 718 | return quota_quotaon(sb, type, id, path); |
c411e5f6 | 719 | case Q_QUOTAOFF: |
d3b86324 | 720 | return quota_quotaoff(sb, type); |
c411e5f6 CH |
721 | case Q_GETFMT: |
722 | return quota_getfmt(sb, type, addr); | |
723 | case Q_GETINFO: | |
724 | return quota_getinfo(sb, type, addr); | |
725 | case Q_SETINFO: | |
726 | return quota_setinfo(sb, type, addr); | |
727 | case Q_GETQUOTA: | |
728 | return quota_getquota(sb, type, id, addr); | |
926132c0 ES |
729 | case Q_GETNEXTQUOTA: |
730 | return quota_getnextquota(sb, type, id, addr); | |
c411e5f6 CH |
731 | case Q_SETQUOTA: |
732 | return quota_setquota(sb, type, id, addr); | |
733 | case Q_SYNC: | |
6ae09575 CH |
734 | if (!sb->s_qcop->quota_sync) |
735 | return -ENOSYS; | |
ceed1723 | 736 | return sb->s_qcop->quota_sync(sb, type); |
c411e5f6 | 737 | case Q_XQUOTAON: |
38e478c4 | 738 | return quota_enable(sb, addr); |
c411e5f6 | 739 | case Q_XQUOTAOFF: |
38e478c4 | 740 | return quota_disable(sb, addr); |
9da93f9b ES |
741 | case Q_XQUOTARM: |
742 | return quota_rmxquota(sb, addr); | |
c411e5f6 CH |
743 | case Q_XGETQSTAT: |
744 | return quota_getxstate(sb, addr); | |
af30cb44 CS |
745 | case Q_XGETQSTATV: |
746 | return quota_getxstatev(sb, addr); | |
c411e5f6 CH |
747 | case Q_XSETQLIM: |
748 | return quota_setxquota(sb, type, id, addr); | |
749 | case Q_XGETQUOTA: | |
750 | return quota_getxquota(sb, type, id, addr); | |
8b375249 ES |
751 | case Q_XGETNEXTQUOTA: |
752 | return quota_getnextxquota(sb, type, id, addr); | |
c411e5f6 | 753 | case Q_XQUOTASYNC: |
8c4e4acd CH |
754 | if (sb->s_flags & MS_RDONLY) |
755 | return -EROFS; | |
4b217ed9 | 756 | /* XFS quotas are fully coherent now, making this call a noop */ |
8c4e4acd | 757 | return 0; |
c411e5f6 | 758 | default: |
f450d4fe | 759 | return -EINVAL; |
1da177e4 | 760 | } |
1da177e4 LT |
761 | } |
762 | ||
56df1278 LJ |
763 | #ifdef CONFIG_BLOCK |
764 | ||
dcdbed85 JK |
765 | /* Return 1 if 'cmd' will block on frozen filesystem */ |
766 | static int quotactl_cmd_write(int cmd) | |
767 | { | |
ccf370e4 JK |
768 | /* |
769 | * We cannot allow Q_GETQUOTA and Q_GETNEXTQUOTA without write access | |
770 | * as dquot_acquire() may allocate space for new structure and OCFS2 | |
771 | * needs to increment on-disk use count. | |
772 | */ | |
dcdbed85 JK |
773 | switch (cmd) { |
774 | case Q_GETFMT: | |
775 | case Q_GETINFO: | |
776 | case Q_SYNC: | |
777 | case Q_XGETQSTAT: | |
af30cb44 | 778 | case Q_XGETQSTATV: |
dcdbed85 | 779 | case Q_XGETQUOTA: |
8b375249 | 780 | case Q_XGETNEXTQUOTA: |
dcdbed85 JK |
781 | case Q_XQUOTASYNC: |
782 | return 0; | |
783 | } | |
784 | return 1; | |
785 | } | |
786 | ||
56df1278 LJ |
787 | #endif /* CONFIG_BLOCK */ |
788 | ||
9361401e DH |
789 | /* |
790 | * look up a superblock on which quota ops will be performed | |
791 | * - use the name of a block device to find the superblock thereon | |
792 | */ | |
dcdbed85 | 793 | static struct super_block *quotactl_block(const char __user *special, int cmd) |
9361401e DH |
794 | { |
795 | #ifdef CONFIG_BLOCK | |
796 | struct block_device *bdev; | |
797 | struct super_block *sb; | |
91a27b2a | 798 | struct filename *tmp = getname(special); |
9361401e DH |
799 | |
800 | if (IS_ERR(tmp)) | |
e231c2ee | 801 | return ERR_CAST(tmp); |
91a27b2a | 802 | bdev = lookup_bdev(tmp->name); |
9361401e DH |
803 | putname(tmp); |
804 | if (IS_ERR(bdev)) | |
e231c2ee | 805 | return ERR_CAST(bdev); |
dcdbed85 JK |
806 | if (quotactl_cmd_write(cmd)) |
807 | sb = get_super_thawed(bdev); | |
808 | else | |
809 | sb = get_super(bdev); | |
9361401e DH |
810 | bdput(bdev); |
811 | if (!sb) | |
812 | return ERR_PTR(-ENODEV); | |
813 | ||
814 | return sb; | |
815 | #else | |
816 | return ERR_PTR(-ENODEV); | |
817 | #endif | |
818 | } | |
819 | ||
1da177e4 LT |
820 | /* |
821 | * This is the system call interface. This communicates with | |
822 | * the user-level programs. Currently this only supports diskquota | |
823 | * calls. Maybe we need to add the process quotas etc. in the future, | |
824 | * but we probably should use rlimits for that. | |
825 | */ | |
3cdad428 HC |
826 | SYSCALL_DEFINE4(quotactl, unsigned int, cmd, const char __user *, special, |
827 | qid_t, id, void __user *, addr) | |
1da177e4 LT |
828 | { |
829 | uint cmds, type; | |
830 | struct super_block *sb = NULL; | |
f00c9e44 | 831 | struct path path, *pathp = NULL; |
1da177e4 LT |
832 | int ret; |
833 | ||
834 | cmds = cmd >> SUBCMDSHIFT; | |
835 | type = cmd & SUBCMDMASK; | |
836 | ||
6ae09575 CH |
837 | /* |
838 | * As a special case Q_SYNC can be called without a specific device. | |
839 | * It will iterate all superblocks that have quota enabled and call | |
840 | * the sync action on each of them. | |
841 | */ | |
842 | if (!special) { | |
843 | if (cmds == Q_SYNC) | |
844 | return quota_sync_all(type); | |
845 | return -ENODEV; | |
1da177e4 LT |
846 | } |
847 | ||
f00c9e44 JK |
848 | /* |
849 | * Path for quotaon has to be resolved before grabbing superblock | |
850 | * because that gets s_umount sem which is also possibly needed by path | |
851 | * resolution (think about autofs) and thus deadlocks could arise. | |
852 | */ | |
853 | if (cmds == Q_QUOTAON) { | |
815d405c | 854 | ret = user_path_at(AT_FDCWD, addr, LOOKUP_FOLLOW|LOOKUP_AUTOMOUNT, &path); |
f00c9e44 JK |
855 | if (ret) |
856 | pathp = ERR_PTR(ret); | |
857 | else | |
858 | pathp = &path; | |
859 | } | |
860 | ||
dcdbed85 | 861 | sb = quotactl_block(special, cmds); |
0aaa6188 JK |
862 | if (IS_ERR(sb)) { |
863 | ret = PTR_ERR(sb); | |
864 | goto out; | |
865 | } | |
6ae09575 | 866 | |
f00c9e44 | 867 | ret = do_quotactl(sb, type, cmds, id, addr, pathp); |
1da177e4 | 868 | |
6ae09575 | 869 | drop_super(sb); |
0aaa6188 | 870 | out: |
f00c9e44 JK |
871 | if (pathp && !IS_ERR(pathp)) |
872 | path_put(pathp); | |
1da177e4 LT |
873 | return ret; |
874 | } |