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> | |
12 | #include <asm/uaccess.h> | |
b716395e | 13 | #include <linux/compat.h> |
1da177e4 | 14 | #include <linux/kernel.h> |
1da177e4 LT |
15 | #include <linux/security.h> |
16 | #include <linux/syscalls.h> | |
17 | #include <linux/buffer_head.h> | |
16f7e0fe | 18 | #include <linux/capability.h> |
be586bab | 19 | #include <linux/quotaops.h> |
b716395e | 20 | #include <linux/types.h> |
86e931a3 SW |
21 | #include <net/netlink.h> |
22 | #include <net/genetlink.h> | |
1da177e4 LT |
23 | |
24 | /* Check validity of generic quotactl commands */ | |
268157ba JK |
25 | static int generic_quotactl_valid(struct super_block *sb, int type, int cmd, |
26 | qid_t id) | |
1da177e4 LT |
27 | { |
28 | if (type >= MAXQUOTAS) | |
29 | return -EINVAL; | |
30 | if (!sb && cmd != Q_SYNC) | |
31 | return -ENODEV; | |
32 | /* Is operation supported? */ | |
33 | if (sb && !sb->s_qcop) | |
34 | return -ENOSYS; | |
35 | ||
1da177e4 LT |
36 | /* Check privileges */ |
37 | if (cmd == Q_GETQUOTA) { | |
da9592ed | 38 | if (((type == USRQUOTA && current_euid() != id) || |
1da177e4 LT |
39 | (type == GRPQUOTA && !in_egroup_p(id))) && |
40 | !capable(CAP_SYS_ADMIN)) | |
41 | return -EPERM; | |
42 | } | |
43 | else if (cmd != Q_GETFMT && cmd != Q_SYNC && cmd != Q_GETINFO) | |
44 | if (!capable(CAP_SYS_ADMIN)) | |
45 | return -EPERM; | |
46 | ||
47 | return 0; | |
48 | } | |
49 | ||
50 | /* Check validity of XFS Quota Manager commands */ | |
268157ba JK |
51 | static int xqm_quotactl_valid(struct super_block *sb, int type, int cmd, |
52 | qid_t id) | |
1da177e4 LT |
53 | { |
54 | if (type >= XQM_MAXQUOTAS) | |
55 | return -EINVAL; | |
56 | if (!sb) | |
57 | return -ENODEV; | |
58 | if (!sb->s_qcop) | |
59 | return -ENOSYS; | |
60 | ||
1da177e4 LT |
61 | /* Check privileges */ |
62 | if (cmd == Q_XGETQUOTA) { | |
da9592ed | 63 | if (((type == XQM_USRQUOTA && current_euid() != id) || |
1da177e4 LT |
64 | (type == XQM_GRPQUOTA && !in_egroup_p(id))) && |
65 | !capable(CAP_SYS_ADMIN)) | |
66 | return -EPERM; | |
de69e5f4 | 67 | } else if (cmd != Q_XGETQSTAT && cmd != Q_XQUOTASYNC) { |
1da177e4 LT |
68 | if (!capable(CAP_SYS_ADMIN)) |
69 | return -EPERM; | |
70 | } | |
71 | ||
72 | return 0; | |
73 | } | |
74 | ||
268157ba JK |
75 | static int check_quotactl_valid(struct super_block *sb, int type, int cmd, |
76 | qid_t id) | |
1da177e4 LT |
77 | { |
78 | int error; | |
79 | ||
80 | if (XQM_COMMAND(cmd)) | |
81 | error = xqm_quotactl_valid(sb, type, cmd, id); | |
82 | else | |
83 | error = generic_quotactl_valid(sb, type, cmd, id); | |
84 | if (!error) | |
85 | error = security_quotactl(cmd, type, id, sb); | |
86 | return error; | |
87 | } | |
88 | ||
850b201b CH |
89 | #ifdef CONFIG_QUOTA |
90 | void sync_quota_sb(struct super_block *sb, int type) | |
1da177e4 LT |
91 | { |
92 | int cnt; | |
1da177e4 | 93 | |
850b201b CH |
94 | if (!sb->s_qcop->quota_sync) |
95 | return; | |
96 | ||
1da177e4 | 97 | sb->s_qcop->quota_sync(sb, type); |
ca785ec6 JK |
98 | |
99 | if (sb_dqopt(sb)->flags & DQUOT_QUOTA_SYS_FILE) | |
100 | return; | |
1da177e4 LT |
101 | /* This is not very clever (and fast) but currently I don't know about |
102 | * any other simple way of getting quota data to disk and we must get | |
103 | * them there for userspace to be visible... */ | |
104 | if (sb->s_op->sync_fs) | |
105 | sb->s_op->sync_fs(sb, 1); | |
106 | sync_blockdev(sb->s_bdev); | |
107 | ||
7925409e JK |
108 | /* |
109 | * Now when everything is written we can discard the pagecache so | |
110 | * that userspace sees the changes. | |
111 | */ | |
d3be915f | 112 | mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); |
1da177e4 | 113 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
1da177e4 LT |
114 | if (type != -1 && cnt != type) |
115 | continue; | |
f55abc0f | 116 | if (!sb_has_quota_active(sb, cnt)) |
1da177e4 | 117 | continue; |
268157ba JK |
118 | mutex_lock_nested(&sb_dqopt(sb)->files[cnt]->i_mutex, |
119 | I_MUTEX_QUOTA); | |
7925409e JK |
120 | truncate_inode_pages(&sb_dqopt(sb)->files[cnt]->i_data, 0); |
121 | mutex_unlock(&sb_dqopt(sb)->files[cnt]->i_mutex); | |
1da177e4 | 122 | } |
d3be915f | 123 | mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); |
1da177e4 | 124 | } |
850b201b | 125 | #endif |
1da177e4 | 126 | |
850b201b | 127 | static void sync_dquots(int type) |
1da177e4 | 128 | { |
850b201b | 129 | struct super_block *sb; |
02a55ca8 | 130 | int cnt; |
618f0636 | 131 | |
618f0636 KK |
132 | spin_lock(&sb_lock); |
133 | restart: | |
134 | list_for_each_entry(sb, &super_blocks, s_list) { | |
268157ba JK |
135 | /* This test just improves performance so it needn't be |
136 | * reliable... */ | |
02a55ca8 JK |
137 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
138 | if (type != -1 && type != cnt) | |
139 | continue; | |
f55abc0f | 140 | if (!sb_has_quota_active(sb, cnt)) |
02a55ca8 JK |
141 | continue; |
142 | if (!info_dirty(&sb_dqopt(sb)->info[cnt]) && | |
268157ba | 143 | list_empty(&sb_dqopt(sb)->info[cnt].dqi_dirty_list)) |
02a55ca8 JK |
144 | continue; |
145 | break; | |
146 | } | |
147 | if (cnt == MAXQUOTAS) | |
618f0636 KK |
148 | continue; |
149 | sb->s_count++; | |
150 | spin_unlock(&sb_lock); | |
151 | down_read(&sb->s_umount); | |
850b201b CH |
152 | if (sb->s_root) |
153 | sync_quota_sb(sb, type); | |
618f0636 KK |
154 | up_read(&sb->s_umount); |
155 | spin_lock(&sb_lock); | |
156 | if (__put_super_and_need_restart(sb)) | |
157 | goto restart; | |
1da177e4 | 158 | } |
618f0636 | 159 | spin_unlock(&sb_lock); |
1da177e4 LT |
160 | } |
161 | ||
c411e5f6 CH |
162 | static int quota_quotaon(struct super_block *sb, int type, int cmd, qid_t id, |
163 | void __user *addr) | |
1da177e4 | 164 | { |
c411e5f6 | 165 | char *pathname; |
f450d4fe | 166 | int ret = -ENOSYS; |
1da177e4 | 167 | |
c411e5f6 CH |
168 | pathname = getname(addr); |
169 | if (IS_ERR(pathname)) | |
170 | return PTR_ERR(pathname); | |
f450d4fe CH |
171 | if (sb->s_qcop->quota_on) |
172 | ret = sb->s_qcop->quota_on(sb, type, id, pathname, 0); | |
c411e5f6 CH |
173 | putname(pathname); |
174 | return ret; | |
175 | } | |
1da177e4 | 176 | |
c411e5f6 CH |
177 | static int quota_getfmt(struct super_block *sb, int type, void __user *addr) |
178 | { | |
179 | __u32 fmt; | |
1da177e4 | 180 | |
c411e5f6 CH |
181 | down_read(&sb_dqopt(sb)->dqptr_sem); |
182 | if (!sb_has_quota_active(sb, type)) { | |
183 | up_read(&sb_dqopt(sb)->dqptr_sem); | |
184 | return -ESRCH; | |
185 | } | |
186 | fmt = sb_dqopt(sb)->info[type].dqi_format->qf_fmt_id; | |
187 | up_read(&sb_dqopt(sb)->dqptr_sem); | |
188 | if (copy_to_user(addr, &fmt, sizeof(fmt))) | |
189 | return -EFAULT; | |
190 | return 0; | |
191 | } | |
1da177e4 | 192 | |
c411e5f6 CH |
193 | static int quota_getinfo(struct super_block *sb, int type, void __user *addr) |
194 | { | |
195 | struct if_dqinfo info; | |
196 | int ret; | |
1da177e4 | 197 | |
f450d4fe CH |
198 | if (!sb_has_quota_active(sb, type)) |
199 | return -ESRCH; | |
200 | if (!sb->s_qcop->get_info) | |
201 | return -ENOSYS; | |
c411e5f6 CH |
202 | ret = sb->s_qcop->get_info(sb, type, &info); |
203 | if (!ret && copy_to_user(addr, &info, sizeof(info))) | |
204 | return -EFAULT; | |
205 | return ret; | |
206 | } | |
1da177e4 | 207 | |
c411e5f6 CH |
208 | static int quota_setinfo(struct super_block *sb, int type, void __user *addr) |
209 | { | |
210 | struct if_dqinfo info; | |
1da177e4 | 211 | |
c411e5f6 CH |
212 | if (copy_from_user(&info, addr, sizeof(info))) |
213 | return -EFAULT; | |
f450d4fe CH |
214 | if (!sb_has_quota_active(sb, type)) |
215 | return -ESRCH; | |
216 | if (!sb->s_qcop->set_info) | |
217 | return -ENOSYS; | |
c411e5f6 CH |
218 | return sb->s_qcop->set_info(sb, type, &info); |
219 | } | |
220 | ||
221 | static int quota_getquota(struct super_block *sb, int type, qid_t id, | |
222 | void __user *addr) | |
223 | { | |
224 | struct if_dqblk idq; | |
225 | int ret; | |
226 | ||
f450d4fe CH |
227 | if (!sb_has_quota_active(sb, type)) |
228 | return -ESRCH; | |
229 | if (!sb->s_qcop->get_dqblk) | |
230 | return -ENOSYS; | |
c411e5f6 CH |
231 | ret = sb->s_qcop->get_dqblk(sb, type, id, &idq); |
232 | if (ret) | |
233 | return ret; | |
234 | if (copy_to_user(addr, &idq, sizeof(idq))) | |
235 | return -EFAULT; | |
236 | return 0; | |
237 | } | |
238 | ||
239 | static int quota_setquota(struct super_block *sb, int type, qid_t id, | |
240 | void __user *addr) | |
241 | { | |
242 | struct if_dqblk idq; | |
243 | ||
244 | if (copy_from_user(&idq, addr, sizeof(idq))) | |
245 | return -EFAULT; | |
f450d4fe CH |
246 | if (!sb_has_quota_active(sb, type)) |
247 | return -ESRCH; | |
248 | if (!sb->s_qcop->set_dqblk) | |
249 | return -ENOSYS; | |
c411e5f6 CH |
250 | return sb->s_qcop->set_dqblk(sb, type, id, &idq); |
251 | } | |
252 | ||
253 | static int quota_setxstate(struct super_block *sb, int cmd, void __user *addr) | |
254 | { | |
255 | __u32 flags; | |
256 | ||
257 | if (copy_from_user(&flags, addr, sizeof(flags))) | |
258 | return -EFAULT; | |
f450d4fe CH |
259 | if (!sb->s_qcop->set_xstate) |
260 | return -ENOSYS; | |
c411e5f6 CH |
261 | return sb->s_qcop->set_xstate(sb, flags, cmd); |
262 | } | |
263 | ||
264 | static int quota_getxstate(struct super_block *sb, void __user *addr) | |
265 | { | |
266 | struct fs_quota_stat fqs; | |
267 | int ret; | |
f450d4fe CH |
268 | |
269 | if (!sb->s_qcop->get_xstate) | |
270 | return -ENOSYS; | |
c411e5f6 CH |
271 | ret = sb->s_qcop->get_xstate(sb, &fqs); |
272 | if (!ret && copy_to_user(addr, &fqs, sizeof(fqs))) | |
273 | return -EFAULT; | |
274 | return ret; | |
275 | } | |
1da177e4 | 276 | |
c411e5f6 CH |
277 | static int quota_setxquota(struct super_block *sb, int type, qid_t id, |
278 | void __user *addr) | |
279 | { | |
280 | struct fs_disk_quota fdq; | |
281 | ||
282 | if (copy_from_user(&fdq, addr, sizeof(fdq))) | |
283 | return -EFAULT; | |
f450d4fe CH |
284 | if (!sb->s_qcop->set_xquota) |
285 | return -ENOSYS; | |
c411e5f6 CH |
286 | return sb->s_qcop->set_xquota(sb, type, id, &fdq); |
287 | } | |
288 | ||
289 | static int quota_getxquota(struct super_block *sb, int type, qid_t id, | |
290 | void __user *addr) | |
291 | { | |
292 | struct fs_disk_quota fdq; | |
293 | int ret; | |
294 | ||
f450d4fe CH |
295 | if (!sb->s_qcop->get_xquota) |
296 | return -ENOSYS; | |
c411e5f6 CH |
297 | ret = sb->s_qcop->get_xquota(sb, type, id, &fdq); |
298 | if (!ret && copy_to_user(addr, &fdq, sizeof(fdq))) | |
299 | return -EFAULT; | |
300 | return ret; | |
301 | } | |
302 | ||
303 | /* Copy parameters and call proper function */ | |
304 | static int do_quotactl(struct super_block *sb, int type, int cmd, qid_t id, | |
305 | void __user *addr) | |
306 | { | |
307 | switch (cmd) { | |
308 | case Q_QUOTAON: | |
309 | return quota_quotaon(sb, type, cmd, id, addr); | |
310 | case Q_QUOTAOFF: | |
f450d4fe CH |
311 | if (!sb->s_qcop->quota_off) |
312 | return -ENOSYS; | |
c411e5f6 CH |
313 | return sb->s_qcop->quota_off(sb, type, 0); |
314 | case Q_GETFMT: | |
315 | return quota_getfmt(sb, type, addr); | |
316 | case Q_GETINFO: | |
317 | return quota_getinfo(sb, type, addr); | |
318 | case Q_SETINFO: | |
319 | return quota_setinfo(sb, type, addr); | |
320 | case Q_GETQUOTA: | |
321 | return quota_getquota(sb, type, id, addr); | |
322 | case Q_SETQUOTA: | |
323 | return quota_setquota(sb, type, id, addr); | |
324 | case Q_SYNC: | |
f450d4fe CH |
325 | if (sb) { |
326 | if (!sb->s_qcop->quota_sync) | |
327 | return -ENOSYS; | |
c411e5f6 | 328 | sync_quota_sb(sb, type); |
f450d4fe | 329 | } else |
c411e5f6 CH |
330 | sync_dquots(type); |
331 | return 0; | |
332 | case Q_XQUOTAON: | |
333 | case Q_XQUOTAOFF: | |
334 | case Q_XQUOTARM: | |
335 | return quota_setxstate(sb, cmd, addr); | |
336 | case Q_XGETQSTAT: | |
337 | return quota_getxstate(sb, addr); | |
338 | case Q_XSETQLIM: | |
339 | return quota_setxquota(sb, type, id, addr); | |
340 | case Q_XGETQUOTA: | |
341 | return quota_getxquota(sb, type, id, addr); | |
342 | case Q_XQUOTASYNC: | |
f450d4fe CH |
343 | if (!sb->s_qcop->quota_sync) |
344 | return -ENOSYS; | |
c411e5f6 | 345 | return sb->s_qcop->quota_sync(sb, type); |
c411e5f6 | 346 | default: |
f450d4fe | 347 | return -EINVAL; |
1da177e4 | 348 | } |
1da177e4 LT |
349 | } |
350 | ||
9361401e DH |
351 | /* |
352 | * look up a superblock on which quota ops will be performed | |
353 | * - use the name of a block device to find the superblock thereon | |
354 | */ | |
7a2435d8 | 355 | static struct super_block *quotactl_block(const char __user *special) |
9361401e DH |
356 | { |
357 | #ifdef CONFIG_BLOCK | |
358 | struct block_device *bdev; | |
359 | struct super_block *sb; | |
360 | char *tmp = getname(special); | |
361 | ||
362 | if (IS_ERR(tmp)) | |
e231c2ee | 363 | return ERR_CAST(tmp); |
9361401e DH |
364 | bdev = lookup_bdev(tmp); |
365 | putname(tmp); | |
366 | if (IS_ERR(bdev)) | |
e231c2ee | 367 | return ERR_CAST(bdev); |
9361401e DH |
368 | sb = get_super(bdev); |
369 | bdput(bdev); | |
370 | if (!sb) | |
371 | return ERR_PTR(-ENODEV); | |
372 | ||
373 | return sb; | |
374 | #else | |
375 | return ERR_PTR(-ENODEV); | |
376 | #endif | |
377 | } | |
378 | ||
1da177e4 LT |
379 | /* |
380 | * This is the system call interface. This communicates with | |
381 | * the user-level programs. Currently this only supports diskquota | |
382 | * calls. Maybe we need to add the process quotas etc. in the future, | |
383 | * but we probably should use rlimits for that. | |
384 | */ | |
3cdad428 HC |
385 | SYSCALL_DEFINE4(quotactl, unsigned int, cmd, const char __user *, special, |
386 | qid_t, id, void __user *, addr) | |
1da177e4 LT |
387 | { |
388 | uint cmds, type; | |
389 | struct super_block *sb = NULL; | |
1da177e4 LT |
390 | int ret; |
391 | ||
392 | cmds = cmd >> SUBCMDSHIFT; | |
393 | type = cmd & SUBCMDMASK; | |
394 | ||
395 | if (cmds != Q_SYNC || special) { | |
9361401e DH |
396 | sb = quotactl_block(special); |
397 | if (IS_ERR(sb)) | |
398 | return PTR_ERR(sb); | |
1da177e4 LT |
399 | } |
400 | ||
401 | ret = check_quotactl_valid(sb, type, cmds, id); | |
402 | if (ret >= 0) | |
403 | ret = do_quotactl(sb, type, cmds, id, addr); | |
404 | if (sb) | |
405 | drop_super(sb); | |
406 | ||
407 | return ret; | |
408 | } | |
b716395e | 409 | |
7a6c8135 | 410 | #if defined(CONFIG_COMPAT_FOR_U64_ALIGNMENT) |
b716395e VT |
411 | /* |
412 | * This code works only for 32 bit quota tools over 64 bit OS (x86_64, ia64) | |
413 | * and is necessary due to alignment problems. | |
414 | */ | |
415 | struct compat_if_dqblk { | |
416 | compat_u64 dqb_bhardlimit; | |
417 | compat_u64 dqb_bsoftlimit; | |
418 | compat_u64 dqb_curspace; | |
419 | compat_u64 dqb_ihardlimit; | |
420 | compat_u64 dqb_isoftlimit; | |
421 | compat_u64 dqb_curinodes; | |
422 | compat_u64 dqb_btime; | |
423 | compat_u64 dqb_itime; | |
424 | compat_uint_t dqb_valid; | |
425 | }; | |
426 | ||
427 | /* XFS structures */ | |
428 | struct compat_fs_qfilestat { | |
429 | compat_u64 dqb_bhardlimit; | |
430 | compat_u64 qfs_nblks; | |
431 | compat_uint_t qfs_nextents; | |
432 | }; | |
433 | ||
434 | struct compat_fs_quota_stat { | |
435 | __s8 qs_version; | |
436 | __u16 qs_flags; | |
437 | __s8 qs_pad; | |
438 | struct compat_fs_qfilestat qs_uquota; | |
439 | struct compat_fs_qfilestat qs_gquota; | |
440 | compat_uint_t qs_incoredqs; | |
441 | compat_int_t qs_btimelimit; | |
442 | compat_int_t qs_itimelimit; | |
443 | compat_int_t qs_rtbtimelimit; | |
444 | __u16 qs_bwarnlimit; | |
445 | __u16 qs_iwarnlimit; | |
446 | }; | |
447 | ||
448 | asmlinkage long sys32_quotactl(unsigned int cmd, const char __user *special, | |
449 | qid_t id, void __user *addr) | |
450 | { | |
451 | unsigned int cmds; | |
452 | struct if_dqblk __user *dqblk; | |
453 | struct compat_if_dqblk __user *compat_dqblk; | |
454 | struct fs_quota_stat __user *fsqstat; | |
455 | struct compat_fs_quota_stat __user *compat_fsqstat; | |
456 | compat_uint_t data; | |
457 | u16 xdata; | |
458 | long ret; | |
459 | ||
460 | cmds = cmd >> SUBCMDSHIFT; | |
461 | ||
462 | switch (cmds) { | |
463 | case Q_GETQUOTA: | |
464 | dqblk = compat_alloc_user_space(sizeof(struct if_dqblk)); | |
465 | compat_dqblk = addr; | |
466 | ret = sys_quotactl(cmd, special, id, dqblk); | |
467 | if (ret) | |
468 | break; | |
469 | if (copy_in_user(compat_dqblk, dqblk, sizeof(*compat_dqblk)) || | |
470 | get_user(data, &dqblk->dqb_valid) || | |
471 | put_user(data, &compat_dqblk->dqb_valid)) | |
472 | ret = -EFAULT; | |
473 | break; | |
474 | case Q_SETQUOTA: | |
475 | dqblk = compat_alloc_user_space(sizeof(struct if_dqblk)); | |
476 | compat_dqblk = addr; | |
477 | ret = -EFAULT; | |
478 | if (copy_in_user(dqblk, compat_dqblk, sizeof(*compat_dqblk)) || | |
479 | get_user(data, &compat_dqblk->dqb_valid) || | |
480 | put_user(data, &dqblk->dqb_valid)) | |
481 | break; | |
482 | ret = sys_quotactl(cmd, special, id, dqblk); | |
483 | break; | |
484 | case Q_XGETQSTAT: | |
485 | fsqstat = compat_alloc_user_space(sizeof(struct fs_quota_stat)); | |
486 | compat_fsqstat = addr; | |
487 | ret = sys_quotactl(cmd, special, id, fsqstat); | |
488 | if (ret) | |
489 | break; | |
490 | ret = -EFAULT; | |
491 | /* Copying qs_version, qs_flags, qs_pad */ | |
492 | if (copy_in_user(compat_fsqstat, fsqstat, | |
493 | offsetof(struct compat_fs_quota_stat, qs_uquota))) | |
494 | break; | |
495 | /* Copying qs_uquota */ | |
496 | if (copy_in_user(&compat_fsqstat->qs_uquota, | |
497 | &fsqstat->qs_uquota, | |
498 | sizeof(compat_fsqstat->qs_uquota)) || | |
499 | get_user(data, &fsqstat->qs_uquota.qfs_nextents) || | |
500 | put_user(data, &compat_fsqstat->qs_uquota.qfs_nextents)) | |
501 | break; | |
502 | /* Copying qs_gquota */ | |
503 | if (copy_in_user(&compat_fsqstat->qs_gquota, | |
504 | &fsqstat->qs_gquota, | |
505 | sizeof(compat_fsqstat->qs_gquota)) || | |
506 | get_user(data, &fsqstat->qs_gquota.qfs_nextents) || | |
507 | put_user(data, &compat_fsqstat->qs_gquota.qfs_nextents)) | |
508 | break; | |
509 | /* Copying the rest */ | |
510 | if (copy_in_user(&compat_fsqstat->qs_incoredqs, | |
511 | &fsqstat->qs_incoredqs, | |
512 | sizeof(struct compat_fs_quota_stat) - | |
513 | offsetof(struct compat_fs_quota_stat, qs_incoredqs)) || | |
514 | get_user(xdata, &fsqstat->qs_iwarnlimit) || | |
515 | put_user(xdata, &compat_fsqstat->qs_iwarnlimit)) | |
516 | break; | |
517 | ret = 0; | |
518 | break; | |
519 | default: | |
520 | ret = sys_quotactl(cmd, special, id, addr); | |
521 | } | |
522 | return ret; | |
523 | } | |
524 | #endif | |
86e931a3 SW |
525 | |
526 | ||
527 | #ifdef CONFIG_QUOTA_NETLINK_INTERFACE | |
528 | ||
529 | /* Netlink family structure for quota */ | |
530 | static struct genl_family quota_genl_family = { | |
531 | .id = GENL_ID_GENERATE, | |
532 | .hdrsize = 0, | |
533 | .name = "VFS_DQUOT", | |
534 | .version = 1, | |
535 | .maxattr = QUOTA_NL_A_MAX, | |
536 | }; | |
537 | ||
538 | /** | |
539 | * quota_send_warning - Send warning to userspace about exceeded quota | |
540 | * @type: The quota type: USRQQUOTA, GRPQUOTA,... | |
541 | * @id: The user or group id of the quota that was exceeded | |
542 | * @dev: The device on which the fs is mounted (sb->s_dev) | |
543 | * @warntype: The type of the warning: QUOTA_NL_... | |
544 | * | |
545 | * This can be used by filesystems (including those which don't use | |
546 | * dquot) to send a message to userspace relating to quota limits. | |
547 | * | |
548 | */ | |
549 | ||
550 | void quota_send_warning(short type, unsigned int id, dev_t dev, | |
551 | const char warntype) | |
552 | { | |
553 | static atomic_t seq; | |
554 | struct sk_buff *skb; | |
555 | void *msg_head; | |
556 | int ret; | |
557 | int msg_size = 4 * nla_total_size(sizeof(u32)) + | |
558 | 2 * nla_total_size(sizeof(u64)); | |
559 | ||
560 | /* We have to allocate using GFP_NOFS as we are called from a | |
561 | * filesystem performing write and thus further recursion into | |
562 | * the fs to free some data could cause deadlocks. */ | |
563 | skb = genlmsg_new(msg_size, GFP_NOFS); | |
564 | if (!skb) { | |
565 | printk(KERN_ERR | |
566 | "VFS: Not enough memory to send quota warning.\n"); | |
567 | return; | |
568 | } | |
569 | msg_head = genlmsg_put(skb, 0, atomic_add_return(1, &seq), | |
570 | "a_genl_family, 0, QUOTA_NL_C_WARNING); | |
571 | if (!msg_head) { | |
572 | printk(KERN_ERR | |
573 | "VFS: Cannot store netlink header in quota warning.\n"); | |
574 | goto err_out; | |
575 | } | |
576 | ret = nla_put_u32(skb, QUOTA_NL_A_QTYPE, type); | |
577 | if (ret) | |
578 | goto attr_err_out; | |
579 | ret = nla_put_u64(skb, QUOTA_NL_A_EXCESS_ID, id); | |
580 | if (ret) | |
581 | goto attr_err_out; | |
582 | ret = nla_put_u32(skb, QUOTA_NL_A_WARNING, warntype); | |
583 | if (ret) | |
584 | goto attr_err_out; | |
585 | ret = nla_put_u32(skb, QUOTA_NL_A_DEV_MAJOR, MAJOR(dev)); | |
586 | if (ret) | |
587 | goto attr_err_out; | |
588 | ret = nla_put_u32(skb, QUOTA_NL_A_DEV_MINOR, MINOR(dev)); | |
589 | if (ret) | |
590 | goto attr_err_out; | |
591 | ret = nla_put_u64(skb, QUOTA_NL_A_CAUSED_ID, current_uid()); | |
592 | if (ret) | |
593 | goto attr_err_out; | |
594 | genlmsg_end(skb, msg_head); | |
595 | ||
596 | genlmsg_multicast(skb, 0, quota_genl_family.id, GFP_NOFS); | |
597 | return; | |
598 | attr_err_out: | |
599 | printk(KERN_ERR "VFS: Not enough space to compose quota message!\n"); | |
600 | err_out: | |
601 | kfree_skb(skb); | |
602 | } | |
603 | EXPORT_SYMBOL(quota_send_warning); | |
604 | ||
605 | static int __init quota_init(void) | |
606 | { | |
607 | if (genl_register_family("a_genl_family) != 0) | |
608 | printk(KERN_ERR | |
609 | "VFS: Failed to create quota netlink interface.\n"); | |
610 | return 0; | |
611 | }; | |
612 | ||
613 | module_init(quota_init); | |
614 | #endif | |
615 |