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