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 | ||
c411e5f6 | 82 | static int quota_quotaon(struct super_block *sb, int type, int cmd, 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 | { | |
121 | struct if_dqinfo info; | |
122 | int ret; | |
1da177e4 | 123 | |
f450d4fe CH |
124 | if (!sb->s_qcop->get_info) |
125 | return -ENOSYS; | |
c411e5f6 CH |
126 | ret = sb->s_qcop->get_info(sb, type, &info); |
127 | if (!ret && copy_to_user(addr, &info, sizeof(info))) | |
128 | return -EFAULT; | |
129 | return ret; | |
130 | } | |
1da177e4 | 131 | |
c411e5f6 CH |
132 | static int quota_setinfo(struct super_block *sb, int type, void __user *addr) |
133 | { | |
134 | struct if_dqinfo info; | |
1da177e4 | 135 | |
c411e5f6 CH |
136 | if (copy_from_user(&info, addr, sizeof(info))) |
137 | return -EFAULT; | |
f450d4fe CH |
138 | if (!sb->s_qcop->set_info) |
139 | return -ENOSYS; | |
c411e5f6 CH |
140 | return sb->s_qcop->set_info(sb, type, &info); |
141 | } | |
142 | ||
14bf61ff JK |
143 | static inline qsize_t qbtos(qsize_t blocks) |
144 | { | |
145 | return blocks << QIF_DQBLKSIZE_BITS; | |
146 | } | |
147 | ||
148 | static inline qsize_t stoqb(qsize_t space) | |
149 | { | |
150 | return (space + QIF_DQBLKSIZE - 1) >> QIF_DQBLKSIZE_BITS; | |
151 | } | |
152 | ||
153 | static void copy_to_if_dqblk(struct if_dqblk *dst, struct qc_dqblk *src) | |
b9b2dd36 | 154 | { |
18da65e7 | 155 | memset(dst, 0, sizeof(*dst)); |
14bf61ff JK |
156 | dst->dqb_bhardlimit = stoqb(src->d_spc_hardlimit); |
157 | dst->dqb_bsoftlimit = stoqb(src->d_spc_softlimit); | |
158 | dst->dqb_curspace = src->d_space; | |
b9b2dd36 CH |
159 | dst->dqb_ihardlimit = src->d_ino_hardlimit; |
160 | dst->dqb_isoftlimit = src->d_ino_softlimit; | |
14bf61ff JK |
161 | dst->dqb_curinodes = src->d_ino_count; |
162 | dst->dqb_btime = src->d_spc_timer; | |
163 | dst->dqb_itime = src->d_ino_timer; | |
b9b2dd36 CH |
164 | dst->dqb_valid = QIF_ALL; |
165 | } | |
166 | ||
c411e5f6 CH |
167 | static int quota_getquota(struct super_block *sb, int type, qid_t id, |
168 | void __user *addr) | |
169 | { | |
74a8a103 | 170 | struct kqid qid; |
14bf61ff | 171 | struct qc_dqblk fdq; |
c411e5f6 CH |
172 | struct if_dqblk idq; |
173 | int ret; | |
174 | ||
f450d4fe CH |
175 | if (!sb->s_qcop->get_dqblk) |
176 | return -ENOSYS; | |
74a8a103 EB |
177 | qid = make_kqid(current_user_ns(), type, id); |
178 | if (!qid_valid(qid)) | |
179 | return -EINVAL; | |
180 | ret = sb->s_qcop->get_dqblk(sb, qid, &fdq); | |
c411e5f6 CH |
181 | if (ret) |
182 | return ret; | |
b9b2dd36 | 183 | copy_to_if_dqblk(&idq, &fdq); |
c411e5f6 CH |
184 | if (copy_to_user(addr, &idq, sizeof(idq))) |
185 | return -EFAULT; | |
186 | return 0; | |
187 | } | |
188 | ||
14bf61ff | 189 | static void copy_from_if_dqblk(struct qc_dqblk *dst, struct if_dqblk *src) |
c472b432 | 190 | { |
14bf61ff JK |
191 | dst->d_spc_hardlimit = qbtos(src->dqb_bhardlimit); |
192 | dst->d_spc_softlimit = qbtos(src->dqb_bsoftlimit); | |
193 | dst->d_space = src->dqb_curspace; | |
c472b432 CH |
194 | dst->d_ino_hardlimit = src->dqb_ihardlimit; |
195 | dst->d_ino_softlimit = src->dqb_isoftlimit; | |
14bf61ff JK |
196 | dst->d_ino_count = src->dqb_curinodes; |
197 | dst->d_spc_timer = src->dqb_btime; | |
198 | dst->d_ino_timer = src->dqb_itime; | |
c472b432 CH |
199 | |
200 | dst->d_fieldmask = 0; | |
201 | if (src->dqb_valid & QIF_BLIMITS) | |
14bf61ff | 202 | dst->d_fieldmask |= QC_SPC_SOFT | QC_SPC_HARD; |
c472b432 | 203 | if (src->dqb_valid & QIF_SPACE) |
14bf61ff | 204 | dst->d_fieldmask |= QC_SPACE; |
c472b432 | 205 | if (src->dqb_valid & QIF_ILIMITS) |
14bf61ff | 206 | dst->d_fieldmask |= QC_INO_SOFT | QC_INO_HARD; |
c472b432 | 207 | if (src->dqb_valid & QIF_INODES) |
14bf61ff | 208 | dst->d_fieldmask |= QC_INO_COUNT; |
c472b432 | 209 | if (src->dqb_valid & QIF_BTIME) |
14bf61ff | 210 | dst->d_fieldmask |= QC_SPC_TIMER; |
c472b432 | 211 | if (src->dqb_valid & QIF_ITIME) |
14bf61ff | 212 | dst->d_fieldmask |= QC_INO_TIMER; |
c472b432 CH |
213 | } |
214 | ||
c411e5f6 CH |
215 | static int quota_setquota(struct super_block *sb, int type, qid_t id, |
216 | void __user *addr) | |
217 | { | |
14bf61ff | 218 | struct qc_dqblk fdq; |
c411e5f6 | 219 | struct if_dqblk idq; |
74a8a103 | 220 | struct kqid qid; |
c411e5f6 CH |
221 | |
222 | if (copy_from_user(&idq, addr, sizeof(idq))) | |
223 | return -EFAULT; | |
f450d4fe CH |
224 | if (!sb->s_qcop->set_dqblk) |
225 | return -ENOSYS; | |
74a8a103 EB |
226 | qid = make_kqid(current_user_ns(), type, id); |
227 | if (!qid_valid(qid)) | |
228 | return -EINVAL; | |
c472b432 | 229 | copy_from_if_dqblk(&fdq, &idq); |
74a8a103 | 230 | return sb->s_qcop->set_dqblk(sb, qid, &fdq); |
c411e5f6 CH |
231 | } |
232 | ||
38e478c4 | 233 | static int quota_enable(struct super_block *sb, void __user *addr) |
c411e5f6 CH |
234 | { |
235 | __u32 flags; | |
236 | ||
237 | if (copy_from_user(&flags, addr, sizeof(flags))) | |
238 | return -EFAULT; | |
38e478c4 | 239 | if (!sb->s_qcop->quota_enable) |
f450d4fe | 240 | return -ENOSYS; |
38e478c4 JK |
241 | return sb->s_qcop->quota_enable(sb, flags); |
242 | } | |
243 | ||
244 | static int quota_disable(struct super_block *sb, void __user *addr) | |
245 | { | |
246 | __u32 flags; | |
247 | ||
248 | if (copy_from_user(&flags, addr, sizeof(flags))) | |
249 | return -EFAULT; | |
250 | if (!sb->s_qcop->quota_disable) | |
251 | return -ENOSYS; | |
252 | return sb->s_qcop->quota_disable(sb, flags); | |
c411e5f6 CH |
253 | } |
254 | ||
255 | static int quota_getxstate(struct super_block *sb, void __user *addr) | |
256 | { | |
257 | struct fs_quota_stat fqs; | |
258 | int ret; | |
f450d4fe CH |
259 | |
260 | if (!sb->s_qcop->get_xstate) | |
261 | return -ENOSYS; | |
c411e5f6 CH |
262 | ret = sb->s_qcop->get_xstate(sb, &fqs); |
263 | if (!ret && copy_to_user(addr, &fqs, sizeof(fqs))) | |
264 | return -EFAULT; | |
265 | return ret; | |
266 | } | |
1da177e4 | 267 | |
af30cb44 CS |
268 | static int quota_getxstatev(struct super_block *sb, void __user *addr) |
269 | { | |
270 | struct fs_quota_statv fqs; | |
271 | int ret; | |
272 | ||
273 | if (!sb->s_qcop->get_xstatev) | |
274 | return -ENOSYS; | |
275 | ||
276 | memset(&fqs, 0, sizeof(fqs)); | |
277 | if (copy_from_user(&fqs, addr, 1)) /* Just read qs_version */ | |
278 | return -EFAULT; | |
279 | ||
280 | /* If this kernel doesn't support user specified version, fail */ | |
281 | switch (fqs.qs_version) { | |
282 | case FS_QSTATV_VERSION1: | |
283 | break; | |
284 | default: | |
285 | return -EINVAL; | |
286 | } | |
287 | ret = sb->s_qcop->get_xstatev(sb, &fqs); | |
288 | if (!ret && copy_to_user(addr, &fqs, sizeof(fqs))) | |
289 | return -EFAULT; | |
290 | return ret; | |
291 | } | |
292 | ||
14bf61ff JK |
293 | /* |
294 | * XFS defines BBTOB and BTOBB macros inside fs/xfs/ and we cannot move them | |
295 | * out of there as xfsprogs rely on definitions being in that header file. So | |
296 | * just define same functions here for quota purposes. | |
297 | */ | |
298 | #define XFS_BB_SHIFT 9 | |
299 | ||
300 | static inline u64 quota_bbtob(u64 blocks) | |
301 | { | |
302 | return blocks << XFS_BB_SHIFT; | |
303 | } | |
304 | ||
305 | static inline u64 quota_btobb(u64 bytes) | |
306 | { | |
307 | return (bytes + (1 << XFS_BB_SHIFT) - 1) >> XFS_BB_SHIFT; | |
308 | } | |
309 | ||
310 | static void copy_from_xfs_dqblk(struct qc_dqblk *dst, struct fs_disk_quota *src) | |
311 | { | |
312 | dst->d_spc_hardlimit = quota_bbtob(src->d_blk_hardlimit); | |
313 | dst->d_spc_softlimit = quota_bbtob(src->d_blk_softlimit); | |
314 | dst->d_ino_hardlimit = src->d_ino_hardlimit; | |
315 | dst->d_ino_softlimit = src->d_ino_softlimit; | |
316 | dst->d_space = quota_bbtob(src->d_bcount); | |
317 | dst->d_ino_count = src->d_icount; | |
318 | dst->d_ino_timer = src->d_itimer; | |
319 | dst->d_spc_timer = src->d_btimer; | |
320 | dst->d_ino_warns = src->d_iwarns; | |
321 | dst->d_spc_warns = src->d_bwarns; | |
322 | dst->d_rt_spc_hardlimit = quota_bbtob(src->d_rtb_hardlimit); | |
323 | dst->d_rt_spc_softlimit = quota_bbtob(src->d_rtb_softlimit); | |
324 | dst->d_rt_space = quota_bbtob(src->d_rtbcount); | |
325 | dst->d_rt_spc_timer = src->d_rtbtimer; | |
326 | dst->d_rt_spc_warns = src->d_rtbwarns; | |
327 | dst->d_fieldmask = 0; | |
328 | if (src->d_fieldmask & FS_DQ_ISOFT) | |
329 | dst->d_fieldmask |= QC_INO_SOFT; | |
330 | if (src->d_fieldmask & FS_DQ_IHARD) | |
331 | dst->d_fieldmask |= QC_INO_HARD; | |
332 | if (src->d_fieldmask & FS_DQ_BSOFT) | |
333 | dst->d_fieldmask |= QC_SPC_SOFT; | |
334 | if (src->d_fieldmask & FS_DQ_BHARD) | |
335 | dst->d_fieldmask |= QC_SPC_HARD; | |
336 | if (src->d_fieldmask & FS_DQ_RTBSOFT) | |
337 | dst->d_fieldmask |= QC_RT_SPC_SOFT; | |
338 | if (src->d_fieldmask & FS_DQ_RTBHARD) | |
339 | dst->d_fieldmask |= QC_RT_SPC_HARD; | |
340 | if (src->d_fieldmask & FS_DQ_BTIMER) | |
341 | dst->d_fieldmask |= QC_SPC_TIMER; | |
342 | if (src->d_fieldmask & FS_DQ_ITIMER) | |
343 | dst->d_fieldmask |= QC_INO_TIMER; | |
344 | if (src->d_fieldmask & FS_DQ_RTBTIMER) | |
345 | dst->d_fieldmask |= QC_RT_SPC_TIMER; | |
346 | if (src->d_fieldmask & FS_DQ_BWARNS) | |
347 | dst->d_fieldmask |= QC_SPC_WARNS; | |
348 | if (src->d_fieldmask & FS_DQ_IWARNS) | |
349 | dst->d_fieldmask |= QC_INO_WARNS; | |
350 | if (src->d_fieldmask & FS_DQ_RTBWARNS) | |
351 | dst->d_fieldmask |= QC_RT_SPC_WARNS; | |
352 | if (src->d_fieldmask & FS_DQ_BCOUNT) | |
353 | dst->d_fieldmask |= QC_SPACE; | |
354 | if (src->d_fieldmask & FS_DQ_ICOUNT) | |
355 | dst->d_fieldmask |= QC_INO_COUNT; | |
356 | if (src->d_fieldmask & FS_DQ_RTBCOUNT) | |
357 | dst->d_fieldmask |= QC_RT_SPACE; | |
358 | } | |
359 | ||
c411e5f6 CH |
360 | static int quota_setxquota(struct super_block *sb, int type, qid_t id, |
361 | void __user *addr) | |
362 | { | |
363 | struct fs_disk_quota fdq; | |
14bf61ff | 364 | struct qc_dqblk qdq; |
74a8a103 | 365 | struct kqid qid; |
c411e5f6 CH |
366 | |
367 | if (copy_from_user(&fdq, addr, sizeof(fdq))) | |
368 | return -EFAULT; | |
c472b432 | 369 | if (!sb->s_qcop->set_dqblk) |
f450d4fe | 370 | return -ENOSYS; |
74a8a103 EB |
371 | qid = make_kqid(current_user_ns(), type, id); |
372 | if (!qid_valid(qid)) | |
373 | return -EINVAL; | |
14bf61ff JK |
374 | copy_from_xfs_dqblk(&qdq, &fdq); |
375 | return sb->s_qcop->set_dqblk(sb, qid, &qdq); | |
376 | } | |
377 | ||
378 | static void copy_to_xfs_dqblk(struct fs_disk_quota *dst, struct qc_dqblk *src, | |
379 | int type, qid_t id) | |
380 | { | |
381 | memset(dst, 0, sizeof(*dst)); | |
382 | dst->d_version = FS_DQUOT_VERSION; | |
383 | dst->d_id = id; | |
384 | if (type == USRQUOTA) | |
385 | dst->d_flags = FS_USER_QUOTA; | |
386 | else if (type == PRJQUOTA) | |
387 | dst->d_flags = FS_PROJ_QUOTA; | |
388 | else | |
389 | dst->d_flags = FS_GROUP_QUOTA; | |
390 | dst->d_blk_hardlimit = quota_btobb(src->d_spc_hardlimit); | |
391 | dst->d_blk_softlimit = quota_btobb(src->d_spc_softlimit); | |
392 | dst->d_ino_hardlimit = src->d_ino_hardlimit; | |
393 | dst->d_ino_softlimit = src->d_ino_softlimit; | |
394 | dst->d_bcount = quota_btobb(src->d_space); | |
395 | dst->d_icount = src->d_ino_count; | |
396 | dst->d_itimer = src->d_ino_timer; | |
397 | dst->d_btimer = src->d_spc_timer; | |
398 | dst->d_iwarns = src->d_ino_warns; | |
399 | dst->d_bwarns = src->d_spc_warns; | |
400 | dst->d_rtb_hardlimit = quota_btobb(src->d_rt_spc_hardlimit); | |
401 | dst->d_rtb_softlimit = quota_btobb(src->d_rt_spc_softlimit); | |
402 | dst->d_rtbcount = quota_btobb(src->d_rt_space); | |
403 | dst->d_rtbtimer = src->d_rt_spc_timer; | |
404 | dst->d_rtbwarns = src->d_rt_spc_warns; | |
c411e5f6 CH |
405 | } |
406 | ||
407 | static int quota_getxquota(struct super_block *sb, int type, qid_t id, | |
408 | void __user *addr) | |
409 | { | |
410 | struct fs_disk_quota fdq; | |
14bf61ff | 411 | struct qc_dqblk qdq; |
74a8a103 | 412 | struct kqid qid; |
c411e5f6 CH |
413 | int ret; |
414 | ||
b9b2dd36 | 415 | if (!sb->s_qcop->get_dqblk) |
f450d4fe | 416 | return -ENOSYS; |
74a8a103 EB |
417 | qid = make_kqid(current_user_ns(), type, id); |
418 | if (!qid_valid(qid)) | |
419 | return -EINVAL; | |
14bf61ff JK |
420 | ret = sb->s_qcop->get_dqblk(sb, qid, &qdq); |
421 | if (ret) | |
422 | return ret; | |
423 | copy_to_xfs_dqblk(&fdq, &qdq, type, id); | |
424 | if (copy_to_user(addr, &fdq, sizeof(fdq))) | |
c411e5f6 CH |
425 | return -EFAULT; |
426 | return ret; | |
427 | } | |
428 | ||
9da93f9b ES |
429 | static int quota_rmxquota(struct super_block *sb, void __user *addr) |
430 | { | |
431 | __u32 flags; | |
432 | ||
433 | if (copy_from_user(&flags, addr, sizeof(flags))) | |
434 | return -EFAULT; | |
435 | if (!sb->s_qcop->rm_xquota) | |
436 | return -ENOSYS; | |
437 | return sb->s_qcop->rm_xquota(sb, flags); | |
438 | } | |
439 | ||
c411e5f6 CH |
440 | /* Copy parameters and call proper function */ |
441 | static int do_quotactl(struct super_block *sb, int type, int cmd, qid_t id, | |
f00c9e44 | 442 | void __user *addr, struct path *path) |
c411e5f6 | 443 | { |
c988afb5 CH |
444 | int ret; |
445 | ||
446 | if (type >= (XQM_COMMAND(cmd) ? XQM_MAXQUOTAS : MAXQUOTAS)) | |
447 | return -EINVAL; | |
2c5f648a JK |
448 | /* |
449 | * Quota not supported on this fs? Check this before s_quota_types | |
450 | * since they needn't be set if quota is not supported at all. | |
451 | */ | |
c988afb5 CH |
452 | if (!sb->s_qcop) |
453 | return -ENOSYS; | |
2c5f648a JK |
454 | if (!(sb->s_quota_types & (1 << type))) |
455 | return -EINVAL; | |
c988afb5 CH |
456 | |
457 | ret = check_quotactl_permission(sb, type, cmd, id); | |
458 | if (ret < 0) | |
459 | return ret; | |
460 | ||
c411e5f6 CH |
461 | switch (cmd) { |
462 | case Q_QUOTAON: | |
f00c9e44 | 463 | return quota_quotaon(sb, type, cmd, id, path); |
c411e5f6 | 464 | case Q_QUOTAOFF: |
d3b86324 | 465 | return quota_quotaoff(sb, type); |
c411e5f6 CH |
466 | case Q_GETFMT: |
467 | return quota_getfmt(sb, type, addr); | |
468 | case Q_GETINFO: | |
469 | return quota_getinfo(sb, type, addr); | |
470 | case Q_SETINFO: | |
471 | return quota_setinfo(sb, type, addr); | |
472 | case Q_GETQUOTA: | |
473 | return quota_getquota(sb, type, id, addr); | |
474 | case Q_SETQUOTA: | |
475 | return quota_setquota(sb, type, id, addr); | |
476 | case Q_SYNC: | |
6ae09575 CH |
477 | if (!sb->s_qcop->quota_sync) |
478 | return -ENOSYS; | |
ceed1723 | 479 | return sb->s_qcop->quota_sync(sb, type); |
c411e5f6 | 480 | case Q_XQUOTAON: |
38e478c4 | 481 | return quota_enable(sb, addr); |
c411e5f6 | 482 | case Q_XQUOTAOFF: |
38e478c4 | 483 | return quota_disable(sb, addr); |
9da93f9b ES |
484 | case Q_XQUOTARM: |
485 | return quota_rmxquota(sb, addr); | |
c411e5f6 CH |
486 | case Q_XGETQSTAT: |
487 | return quota_getxstate(sb, addr); | |
af30cb44 CS |
488 | case Q_XGETQSTATV: |
489 | return quota_getxstatev(sb, addr); | |
c411e5f6 CH |
490 | case Q_XSETQLIM: |
491 | return quota_setxquota(sb, type, id, addr); | |
492 | case Q_XGETQUOTA: | |
493 | return quota_getxquota(sb, type, id, addr); | |
494 | case Q_XQUOTASYNC: | |
8c4e4acd CH |
495 | if (sb->s_flags & MS_RDONLY) |
496 | return -EROFS; | |
4b217ed9 | 497 | /* XFS quotas are fully coherent now, making this call a noop */ |
8c4e4acd | 498 | return 0; |
c411e5f6 | 499 | default: |
f450d4fe | 500 | return -EINVAL; |
1da177e4 | 501 | } |
1da177e4 LT |
502 | } |
503 | ||
56df1278 LJ |
504 | #ifdef CONFIG_BLOCK |
505 | ||
dcdbed85 JK |
506 | /* Return 1 if 'cmd' will block on frozen filesystem */ |
507 | static int quotactl_cmd_write(int cmd) | |
508 | { | |
509 | switch (cmd) { | |
510 | case Q_GETFMT: | |
511 | case Q_GETINFO: | |
512 | case Q_SYNC: | |
513 | case Q_XGETQSTAT: | |
af30cb44 | 514 | case Q_XGETQSTATV: |
dcdbed85 JK |
515 | case Q_XGETQUOTA: |
516 | case Q_XQUOTASYNC: | |
517 | return 0; | |
518 | } | |
519 | return 1; | |
520 | } | |
521 | ||
56df1278 LJ |
522 | #endif /* CONFIG_BLOCK */ |
523 | ||
9361401e DH |
524 | /* |
525 | * look up a superblock on which quota ops will be performed | |
526 | * - use the name of a block device to find the superblock thereon | |
527 | */ | |
dcdbed85 | 528 | static struct super_block *quotactl_block(const char __user *special, int cmd) |
9361401e DH |
529 | { |
530 | #ifdef CONFIG_BLOCK | |
531 | struct block_device *bdev; | |
532 | struct super_block *sb; | |
91a27b2a | 533 | struct filename *tmp = getname(special); |
9361401e DH |
534 | |
535 | if (IS_ERR(tmp)) | |
e231c2ee | 536 | return ERR_CAST(tmp); |
91a27b2a | 537 | bdev = lookup_bdev(tmp->name); |
9361401e DH |
538 | putname(tmp); |
539 | if (IS_ERR(bdev)) | |
e231c2ee | 540 | return ERR_CAST(bdev); |
dcdbed85 JK |
541 | if (quotactl_cmd_write(cmd)) |
542 | sb = get_super_thawed(bdev); | |
543 | else | |
544 | sb = get_super(bdev); | |
9361401e DH |
545 | bdput(bdev); |
546 | if (!sb) | |
547 | return ERR_PTR(-ENODEV); | |
548 | ||
549 | return sb; | |
550 | #else | |
551 | return ERR_PTR(-ENODEV); | |
552 | #endif | |
553 | } | |
554 | ||
1da177e4 LT |
555 | /* |
556 | * This is the system call interface. This communicates with | |
557 | * the user-level programs. Currently this only supports diskquota | |
558 | * calls. Maybe we need to add the process quotas etc. in the future, | |
559 | * but we probably should use rlimits for that. | |
560 | */ | |
3cdad428 HC |
561 | SYSCALL_DEFINE4(quotactl, unsigned int, cmd, const char __user *, special, |
562 | qid_t, id, void __user *, addr) | |
1da177e4 LT |
563 | { |
564 | uint cmds, type; | |
565 | struct super_block *sb = NULL; | |
f00c9e44 | 566 | struct path path, *pathp = NULL; |
1da177e4 LT |
567 | int ret; |
568 | ||
569 | cmds = cmd >> SUBCMDSHIFT; | |
570 | type = cmd & SUBCMDMASK; | |
571 | ||
6ae09575 CH |
572 | /* |
573 | * As a special case Q_SYNC can be called without a specific device. | |
574 | * It will iterate all superblocks that have quota enabled and call | |
575 | * the sync action on each of them. | |
576 | */ | |
577 | if (!special) { | |
578 | if (cmds == Q_SYNC) | |
579 | return quota_sync_all(type); | |
580 | return -ENODEV; | |
1da177e4 LT |
581 | } |
582 | ||
f00c9e44 JK |
583 | /* |
584 | * Path for quotaon has to be resolved before grabbing superblock | |
585 | * because that gets s_umount sem which is also possibly needed by path | |
586 | * resolution (think about autofs) and thus deadlocks could arise. | |
587 | */ | |
588 | if (cmds == Q_QUOTAON) { | |
815d405c | 589 | ret = user_path_at(AT_FDCWD, addr, LOOKUP_FOLLOW|LOOKUP_AUTOMOUNT, &path); |
f00c9e44 JK |
590 | if (ret) |
591 | pathp = ERR_PTR(ret); | |
592 | else | |
593 | pathp = &path; | |
594 | } | |
595 | ||
dcdbed85 | 596 | sb = quotactl_block(special, cmds); |
0aaa6188 JK |
597 | if (IS_ERR(sb)) { |
598 | ret = PTR_ERR(sb); | |
599 | goto out; | |
600 | } | |
6ae09575 | 601 | |
f00c9e44 | 602 | ret = do_quotactl(sb, type, cmds, id, addr, pathp); |
1da177e4 | 603 | |
6ae09575 | 604 | drop_super(sb); |
0aaa6188 | 605 | out: |
f00c9e44 JK |
606 | if (pathp && !IS_ERR(pathp)) |
607 | path_put(pathp); | |
1da177e4 LT |
608 | return ret; |
609 | } |