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