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path: root/fs/quota/quota.c
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-rw-r--r--fs/quota/quota.c735
1 files changed, 228 insertions, 507 deletions
diff --git a/fs/quota/quota.c b/fs/quota/quota.c
index ee91e2756950..95388f9b7356 100644
--- a/fs/quota/quota.c
+++ b/fs/quota/quota.c
@@ -10,7 +10,6 @@
10#include <linux/slab.h> 10#include <linux/slab.h>
11#include <asm/current.h> 11#include <asm/current.h>
12#include <asm/uaccess.h> 12#include <asm/uaccess.h>
13#include <linux/compat.h>
14#include <linux/kernel.h> 13#include <linux/kernel.h>
15#include <linux/security.h> 14#include <linux/security.h>
16#include <linux/syscalls.h> 15#include <linux/syscalls.h>
@@ -18,220 +17,205 @@
18#include <linux/capability.h> 17#include <linux/capability.h>
19#include <linux/quotaops.h> 18#include <linux/quotaops.h>
20#include <linux/types.h> 19#include <linux/types.h>
21#include <net/netlink.h> 20#include <linux/writeback.h>
22#include <net/genetlink.h>
23 21
24/* Check validity of generic quotactl commands */ 22static int check_quotactl_permission(struct super_block *sb, int type, int cmd,
25static int generic_quotactl_valid(struct super_block *sb, int type, int cmd, 23 qid_t id)
26 qid_t id)
27{ 24{
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
36 switch (cmd) { 25 switch (cmd) {
37 case Q_GETFMT: 26 /* these commands do not require any special privilegues */
38 break; 27 case Q_GETFMT:
39 case Q_QUOTAON: 28 case Q_SYNC:
40 if (!sb->s_qcop->quota_on) 29 case Q_GETINFO:
41 return -ENOSYS; 30 case Q_XGETQSTAT:
42 break; 31 case Q_XQUOTASYNC:
43 case Q_QUOTAOFF: 32 break;
44 if (!sb->s_qcop->quota_off) 33 /* allow to query information for dquots we "own" */
45 return -ENOSYS; 34 case Q_GETQUOTA:
46 break; 35 case Q_XGETQUOTA:
47 case Q_SETINFO: 36 if ((type == USRQUOTA && current_euid() == id) ||
48 if (!sb->s_qcop->set_info) 37 (type == GRPQUOTA && in_egroup_p(id)))
49 return -ENOSYS;
50 break;
51 case Q_GETINFO:
52 if (!sb->s_qcop->get_info)
53 return -ENOSYS;
54 break;
55 case Q_SETQUOTA:
56 if (!sb->s_qcop->set_dqblk)
57 return -ENOSYS;
58 break;
59 case Q_GETQUOTA:
60 if (!sb->s_qcop->get_dqblk)
61 return -ENOSYS;
62 break;
63 case Q_SYNC:
64 if (sb && !sb->s_qcop->quota_sync)
65 return -ENOSYS;
66 break; 38 break;
67 default: 39 /*FALLTHROUGH*/
68 return -EINVAL; 40 default:
41 if (!capable(CAP_SYS_ADMIN))
42 return -EPERM;
69 } 43 }
70 44
71 /* Is quota turned on for commands which need it? */ 45 return security_quotactl(cmd, type, id, sb);
72 switch (cmd) { 46}
73 case Q_GETFMT:
74 case Q_GETINFO:
75 case Q_SETINFO:
76 case Q_SETQUOTA:
77 case Q_GETQUOTA:
78 /* This is just an informative test so we are satisfied
79 * without the lock */
80 if (!sb_has_quota_active(sb, type))
81 return -ESRCH;
82 }
83 47
84 /* Check privileges */ 48static int quota_sync_all(int type)
85 if (cmd == Q_GETQUOTA) { 49{
86 if (((type == USRQUOTA && current_euid() != id) || 50 struct super_block *sb;
87 (type == GRPQUOTA && !in_egroup_p(id))) && 51 int ret;
88 !capable(CAP_SYS_ADMIN)) 52
89 return -EPERM; 53 if (type >= MAXQUOTAS)
54 return -EINVAL;
55 ret = security_quotactl(Q_SYNC, type, 0, NULL);
56 if (ret)
57 return ret;
58
59 spin_lock(&sb_lock);
60restart:
61 list_for_each_entry(sb, &super_blocks, s_list) {
62 if (!sb->s_qcop || !sb->s_qcop->quota_sync)
63 continue;
64
65 sb->s_count++;
66 spin_unlock(&sb_lock);
67 down_read(&sb->s_umount);
68 if (sb->s_root)
69 sb->s_qcop->quota_sync(sb, type, 1);
70 up_read(&sb->s_umount);
71 spin_lock(&sb_lock);
72 if (__put_super_and_need_restart(sb))
73 goto restart;
90 } 74 }
91 else if (cmd != Q_GETFMT && cmd != Q_SYNC && cmd != Q_GETINFO) 75 spin_unlock(&sb_lock);
92 if (!capable(CAP_SYS_ADMIN))
93 return -EPERM;
94 76
95 return 0; 77 return 0;
96} 78}
97 79
98/* Check validity of XFS Quota Manager commands */ 80static int quota_quotaon(struct super_block *sb, int type, int cmd, qid_t id,
99static int xqm_quotactl_valid(struct super_block *sb, int type, int cmd, 81 void __user *addr)
100 qid_t id)
101{ 82{
102 if (type >= XQM_MAXQUOTAS) 83 char *pathname;
103 return -EINVAL; 84 int ret = -ENOSYS;
104 if (!sb) 85
105 return -ENODEV; 86 pathname = getname(addr);
106 if (!sb->s_qcop) 87 if (IS_ERR(pathname))
107 return -ENOSYS; 88 return PTR_ERR(pathname);
89 if (sb->s_qcop->quota_on)
90 ret = sb->s_qcop->quota_on(sb, type, id, pathname, 0);
91 putname(pathname);
92 return ret;
93}
108 94
109 switch (cmd) { 95static int quota_getfmt(struct super_block *sb, int type, void __user *addr)
110 case Q_XQUOTAON: 96{
111 case Q_XQUOTAOFF: 97 __u32 fmt;
112 case Q_XQUOTARM:
113 if (!sb->s_qcop->set_xstate)
114 return -ENOSYS;
115 break;
116 case Q_XGETQSTAT:
117 if (!sb->s_qcop->get_xstate)
118 return -ENOSYS;
119 break;
120 case Q_XSETQLIM:
121 if (!sb->s_qcop->set_xquota)
122 return -ENOSYS;
123 break;
124 case Q_XGETQUOTA:
125 if (!sb->s_qcop->get_xquota)
126 return -ENOSYS;
127 break;
128 case Q_XQUOTASYNC:
129 if (!sb->s_qcop->quota_sync)
130 return -ENOSYS;
131 break;
132 default:
133 return -EINVAL;
134 }
135 98
136 /* Check privileges */ 99 down_read(&sb_dqopt(sb)->dqptr_sem);
137 if (cmd == Q_XGETQUOTA) { 100 if (!sb_has_quota_active(sb, type)) {
138 if (((type == XQM_USRQUOTA && current_euid() != id) || 101 up_read(&sb_dqopt(sb)->dqptr_sem);
139 (type == XQM_GRPQUOTA && !in_egroup_p(id))) && 102 return -ESRCH;
140 !capable(CAP_SYS_ADMIN))
141 return -EPERM;
142 } else if (cmd != Q_XGETQSTAT && cmd != Q_XQUOTASYNC) {
143 if (!capable(CAP_SYS_ADMIN))
144 return -EPERM;
145 } 103 }
104 fmt = sb_dqopt(sb)->info[type].dqi_format->qf_fmt_id;
105 up_read(&sb_dqopt(sb)->dqptr_sem);
106 if (copy_to_user(addr, &fmt, sizeof(fmt)))
107 return -EFAULT;
108 return 0;
109}
146 110
111static int quota_getinfo(struct super_block *sb, int type, void __user *addr)
112{
113 struct if_dqinfo info;
114 int ret;
115
116 if (!sb_has_quota_active(sb, type))
117 return -ESRCH;
118 if (!sb->s_qcop->get_info)
119 return -ENOSYS;
120 ret = sb->s_qcop->get_info(sb, type, &info);
121 if (!ret && copy_to_user(addr, &info, sizeof(info)))
122 return -EFAULT;
123 return ret;
124}
125
126static int quota_setinfo(struct super_block *sb, int type, void __user *addr)
127{
128 struct if_dqinfo info;
129
130 if (copy_from_user(&info, addr, sizeof(info)))
131 return -EFAULT;
132 if (!sb_has_quota_active(sb, type))
133 return -ESRCH;
134 if (!sb->s_qcop->set_info)
135 return -ENOSYS;
136 return sb->s_qcop->set_info(sb, type, &info);
137}
138
139static int quota_getquota(struct super_block *sb, int type, qid_t id,
140 void __user *addr)
141{
142 struct if_dqblk idq;
143 int ret;
144
145 if (!sb_has_quota_active(sb, type))
146 return -ESRCH;
147 if (!sb->s_qcop->get_dqblk)
148 return -ENOSYS;
149 ret = sb->s_qcop->get_dqblk(sb, type, id, &idq);
150 if (ret)
151 return ret;
152 if (copy_to_user(addr, &idq, sizeof(idq)))
153 return -EFAULT;
147 return 0; 154 return 0;
148} 155}
149 156
150static int check_quotactl_valid(struct super_block *sb, int type, int cmd, 157static int quota_setquota(struct super_block *sb, int type, qid_t id,
151 qid_t id) 158 void __user *addr)
152{ 159{
153 int error; 160 struct if_dqblk idq;
154 161
155 if (XQM_COMMAND(cmd)) 162 if (copy_from_user(&idq, addr, sizeof(idq)))
156 error = xqm_quotactl_valid(sb, type, cmd, id); 163 return -EFAULT;
157 else 164 if (!sb_has_quota_active(sb, type))
158 error = generic_quotactl_valid(sb, type, cmd, id); 165 return -ESRCH;
159 if (!error) 166 if (!sb->s_qcop->set_dqblk)
160 error = security_quotactl(cmd, type, id, sb); 167 return -ENOSYS;
161 return error; 168 return sb->s_qcop->set_dqblk(sb, type, id, &idq);
162} 169}
163 170
164#ifdef CONFIG_QUOTA 171static int quota_setxstate(struct super_block *sb, int cmd, void __user *addr)
165void sync_quota_sb(struct super_block *sb, int type)
166{ 172{
167 int cnt; 173 __u32 flags;
168 174
169 if (!sb->s_qcop->quota_sync) 175 if (copy_from_user(&flags, addr, sizeof(flags)))
170 return; 176 return -EFAULT;
177 if (!sb->s_qcop->set_xstate)
178 return -ENOSYS;
179 return sb->s_qcop->set_xstate(sb, flags, cmd);
180}
171 181
172 sb->s_qcop->quota_sync(sb, type); 182static int quota_getxstate(struct super_block *sb, void __user *addr)
183{
184 struct fs_quota_stat fqs;
185 int ret;
173 186
174 if (sb_dqopt(sb)->flags & DQUOT_QUOTA_SYS_FILE) 187 if (!sb->s_qcop->get_xstate)
175 return; 188 return -ENOSYS;
176 /* This is not very clever (and fast) but currently I don't know about 189 ret = sb->s_qcop->get_xstate(sb, &fqs);
177 * any other simple way of getting quota data to disk and we must get 190 if (!ret && copy_to_user(addr, &fqs, sizeof(fqs)))
178 * them there for userspace to be visible... */ 191 return -EFAULT;
179 if (sb->s_op->sync_fs) 192 return ret;
180 sb->s_op->sync_fs(sb, 1); 193}
181 sync_blockdev(sb->s_bdev);
182 194
183 /* 195static int quota_setxquota(struct super_block *sb, int type, qid_t id,
184 * Now when everything is written we can discard the pagecache so 196 void __user *addr)
185 * that userspace sees the changes. 197{
186 */ 198 struct fs_disk_quota fdq;
187 mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); 199
188 for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 200 if (copy_from_user(&fdq, addr, sizeof(fdq)))
189 if (type != -1 && cnt != type) 201 return -EFAULT;
190 continue; 202 if (!sb->s_qcop->set_xquota)
191 if (!sb_has_quota_active(sb, cnt)) 203 return -ENOSYS;
192 continue; 204 return sb->s_qcop->set_xquota(sb, type, id, &fdq);
193 mutex_lock_nested(&sb_dqopt(sb)->files[cnt]->i_mutex,
194 I_MUTEX_QUOTA);
195 truncate_inode_pages(&sb_dqopt(sb)->files[cnt]->i_data, 0);
196 mutex_unlock(&sb_dqopt(sb)->files[cnt]->i_mutex);
197 }
198 mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
199} 205}
200#endif
201 206
202static void sync_dquots(int type) 207static int quota_getxquota(struct super_block *sb, int type, qid_t id,
208 void __user *addr)
203{ 209{
204 struct super_block *sb; 210 struct fs_disk_quota fdq;
205 int cnt; 211 int ret;
206 212
207 spin_lock(&sb_lock); 213 if (!sb->s_qcop->get_xquota)
208restart: 214 return -ENOSYS;
209 list_for_each_entry(sb, &super_blocks, s_list) { 215 ret = sb->s_qcop->get_xquota(sb, type, id, &fdq);
210 /* This test just improves performance so it needn't be 216 if (!ret && copy_to_user(addr, &fdq, sizeof(fdq)))
211 * reliable... */ 217 return -EFAULT;
212 for (cnt = 0; cnt < MAXQUOTAS; cnt++) { 218 return ret;
213 if (type != -1 && type != cnt)
214 continue;
215 if (!sb_has_quota_active(sb, cnt))
216 continue;
217 if (!info_dirty(&sb_dqopt(sb)->info[cnt]) &&
218 list_empty(&sb_dqopt(sb)->info[cnt].dqi_dirty_list))
219 continue;
220 break;
221 }
222 if (cnt == MAXQUOTAS)
223 continue;
224 sb->s_count++;
225 spin_unlock(&sb_lock);
226 down_read(&sb->s_umount);
227 if (sb->s_root)
228 sync_quota_sb(sb, type);
229 up_read(&sb->s_umount);
230 spin_lock(&sb_lock);
231 if (__put_super_and_need_restart(sb))
232 goto restart;
233 }
234 spin_unlock(&sb_lock);
235} 219}
236 220
237/* Copy parameters and call proper function */ 221/* Copy parameters and call proper function */
@@ -240,117 +224,55 @@ static int do_quotactl(struct super_block *sb, int type, int cmd, qid_t id,
240{ 224{
241 int ret; 225 int ret;
242 226
227 if (type >= (XQM_COMMAND(cmd) ? XQM_MAXQUOTAS : MAXQUOTAS))
228 return -EINVAL;
229 if (!sb->s_qcop)
230 return -ENOSYS;
231
232 ret = check_quotactl_permission(sb, type, cmd, id);
233 if (ret < 0)
234 return ret;
235
243 switch (cmd) { 236 switch (cmd) {
244 case Q_QUOTAON: { 237 case Q_QUOTAON:
245 char *pathname; 238 return quota_quotaon(sb, type, cmd, id, addr);
246 239 case Q_QUOTAOFF:
247 pathname = getname(addr); 240 if (!sb->s_qcop->quota_off)
248 if (IS_ERR(pathname)) 241 return -ENOSYS;
249 return PTR_ERR(pathname); 242 return sb->s_qcop->quota_off(sb, type, 0);
250 ret = sb->s_qcop->quota_on(sb, type, id, pathname, 0); 243 case Q_GETFMT:
251 putname(pathname); 244 return quota_getfmt(sb, type, addr);
252 return ret; 245 case Q_GETINFO:
253 } 246 return quota_getinfo(sb, type, addr);
254 case Q_QUOTAOFF: 247 case Q_SETINFO:
255 return sb->s_qcop->quota_off(sb, type, 0); 248 return quota_setinfo(sb, type, addr);
256 249 case Q_GETQUOTA:
257 case Q_GETFMT: { 250 return quota_getquota(sb, type, id, addr);
258 __u32 fmt; 251 case Q_SETQUOTA:
259 252 return quota_setquota(sb, type, id, addr);
260 down_read(&sb_dqopt(sb)->dqptr_sem); 253 case Q_SYNC:
261 if (!sb_has_quota_active(sb, type)) { 254 if (!sb->s_qcop->quota_sync)
262 up_read(&sb_dqopt(sb)->dqptr_sem); 255 return -ENOSYS;
263 return -ESRCH; 256 return sb->s_qcop->quota_sync(sb, type, 1);
264 } 257 case Q_XQUOTAON:
265 fmt = sb_dqopt(sb)->info[type].dqi_format->qf_fmt_id; 258 case Q_XQUOTAOFF:
266 up_read(&sb_dqopt(sb)->dqptr_sem); 259 case Q_XQUOTARM:
267 if (copy_to_user(addr, &fmt, sizeof(fmt))) 260 return quota_setxstate(sb, cmd, addr);
268 return -EFAULT; 261 case Q_XGETQSTAT:
269 return 0; 262 return quota_getxstate(sb, addr);
270 } 263 case Q_XSETQLIM:
271 case Q_GETINFO: { 264 return quota_setxquota(sb, type, id, addr);
272 struct if_dqinfo info; 265 case Q_XGETQUOTA:
273 266 return quota_getxquota(sb, type, id, addr);
274 ret = sb->s_qcop->get_info(sb, type, &info); 267 case Q_XQUOTASYNC:
275 if (ret) 268 /* caller already holds s_umount */
276 return ret; 269 if (sb->s_flags & MS_RDONLY)
277 if (copy_to_user(addr, &info, sizeof(info))) 270 return -EROFS;
278 return -EFAULT; 271 writeback_inodes_sb(sb);
279 return 0; 272 return 0;
280 } 273 default:
281 case Q_SETINFO: { 274 return -EINVAL;
282 struct if_dqinfo info;
283
284 if (copy_from_user(&info, addr, sizeof(info)))
285 return -EFAULT;
286 return sb->s_qcop->set_info(sb, type, &info);
287 }
288 case Q_GETQUOTA: {
289 struct if_dqblk idq;
290
291 ret = sb->s_qcop->get_dqblk(sb, type, id, &idq);
292 if (ret)
293 return ret;
294 if (copy_to_user(addr, &idq, sizeof(idq)))
295 return -EFAULT;
296 return 0;
297 }
298 case Q_SETQUOTA: {
299 struct if_dqblk idq;
300
301 if (copy_from_user(&idq, addr, sizeof(idq)))
302 return -EFAULT;
303 return sb->s_qcop->set_dqblk(sb, type, id, &idq);
304 }
305 case Q_SYNC:
306 if (sb)
307 sync_quota_sb(sb, type);
308 else
309 sync_dquots(type);
310 return 0;
311
312 case Q_XQUOTAON:
313 case Q_XQUOTAOFF:
314 case Q_XQUOTARM: {
315 __u32 flags;
316
317 if (copy_from_user(&flags, addr, sizeof(flags)))
318 return -EFAULT;
319 return sb->s_qcop->set_xstate(sb, flags, cmd);
320 }
321 case Q_XGETQSTAT: {
322 struct fs_quota_stat fqs;
323
324 if ((ret = sb->s_qcop->get_xstate(sb, &fqs)))
325 return ret;
326 if (copy_to_user(addr, &fqs, sizeof(fqs)))
327 return -EFAULT;
328 return 0;
329 }
330 case Q_XSETQLIM: {
331 struct fs_disk_quota fdq;
332
333 if (copy_from_user(&fdq, addr, sizeof(fdq)))
334 return -EFAULT;
335 return sb->s_qcop->set_xquota(sb, type, id, &fdq);
336 }
337 case Q_XGETQUOTA: {
338 struct fs_disk_quota fdq;
339
340 ret = sb->s_qcop->get_xquota(sb, type, id, &fdq);
341 if (ret)
342 return ret;
343 if (copy_to_user(addr, &fdq, sizeof(fdq)))
344 return -EFAULT;
345 return 0;
346 }
347 case Q_XQUOTASYNC:
348 return sb->s_qcop->quota_sync(sb, type);
349 /* We never reach here unless validity check is broken */
350 default:
351 BUG();
352 } 275 }
353 return 0;
354} 276}
355 277
356/* 278/*
@@ -397,224 +319,23 @@ SYSCALL_DEFINE4(quotactl, unsigned int, cmd, const char __user *, special,
397 cmds = cmd >> SUBCMDSHIFT; 319 cmds = cmd >> SUBCMDSHIFT;
398 type = cmd & SUBCMDMASK; 320 type = cmd & SUBCMDMASK;
399 321
400 if (cmds != Q_SYNC || special) { 322 /*
401 sb = quotactl_block(special); 323 * As a special case Q_SYNC can be called without a specific device.
402 if (IS_ERR(sb)) 324 * It will iterate all superblocks that have quota enabled and call
403 return PTR_ERR(sb); 325 * the sync action on each of them.
326 */
327 if (!special) {
328 if (cmds == Q_SYNC)
329 return quota_sync_all(type);
330 return -ENODEV;
404 } 331 }
405 332
406 ret = check_quotactl_valid(sb, type, cmds, id); 333 sb = quotactl_block(special);
407 if (ret >= 0) 334 if (IS_ERR(sb))
408 ret = do_quotactl(sb, type, cmds, id, addr); 335 return PTR_ERR(sb);
409 if (sb)
410 drop_super(sb);
411 336
412 return ret; 337 ret = do_quotactl(sb, type, cmds, id, addr);
413}
414
415#if defined(CONFIG_COMPAT_FOR_U64_ALIGNMENT)
416/*
417 * This code works only for 32 bit quota tools over 64 bit OS (x86_64, ia64)
418 * and is necessary due to alignment problems.
419 */
420struct compat_if_dqblk {
421 compat_u64 dqb_bhardlimit;
422 compat_u64 dqb_bsoftlimit;
423 compat_u64 dqb_curspace;
424 compat_u64 dqb_ihardlimit;
425 compat_u64 dqb_isoftlimit;
426 compat_u64 dqb_curinodes;
427 compat_u64 dqb_btime;
428 compat_u64 dqb_itime;
429 compat_uint_t dqb_valid;
430};
431
432/* XFS structures */
433struct compat_fs_qfilestat {
434 compat_u64 dqb_bhardlimit;
435 compat_u64 qfs_nblks;
436 compat_uint_t qfs_nextents;
437};
438
439struct compat_fs_quota_stat {
440 __s8 qs_version;
441 __u16 qs_flags;
442 __s8 qs_pad;
443 struct compat_fs_qfilestat qs_uquota;
444 struct compat_fs_qfilestat qs_gquota;
445 compat_uint_t qs_incoredqs;
446 compat_int_t qs_btimelimit;
447 compat_int_t qs_itimelimit;
448 compat_int_t qs_rtbtimelimit;
449 __u16 qs_bwarnlimit;
450 __u16 qs_iwarnlimit;
451};
452
453asmlinkage long sys32_quotactl(unsigned int cmd, const char __user *special,
454 qid_t id, void __user *addr)
455{
456 unsigned int cmds;
457 struct if_dqblk __user *dqblk;
458 struct compat_if_dqblk __user *compat_dqblk;
459 struct fs_quota_stat __user *fsqstat;
460 struct compat_fs_quota_stat __user *compat_fsqstat;
461 compat_uint_t data;
462 u16 xdata;
463 long ret;
464 338
465 cmds = cmd >> SUBCMDSHIFT; 339 drop_super(sb);
466
467 switch (cmds) {
468 case Q_GETQUOTA:
469 dqblk = compat_alloc_user_space(sizeof(struct if_dqblk));
470 compat_dqblk = addr;
471 ret = sys_quotactl(cmd, special, id, dqblk);
472 if (ret)
473 break;
474 if (copy_in_user(compat_dqblk, dqblk, sizeof(*compat_dqblk)) ||
475 get_user(data, &dqblk->dqb_valid) ||
476 put_user(data, &compat_dqblk->dqb_valid))
477 ret = -EFAULT;
478 break;
479 case Q_SETQUOTA:
480 dqblk = compat_alloc_user_space(sizeof(struct if_dqblk));
481 compat_dqblk = addr;
482 ret = -EFAULT;
483 if (copy_in_user(dqblk, compat_dqblk, sizeof(*compat_dqblk)) ||
484 get_user(data, &compat_dqblk->dqb_valid) ||
485 put_user(data, &dqblk->dqb_valid))
486 break;
487 ret = sys_quotactl(cmd, special, id, dqblk);
488 break;
489 case Q_XGETQSTAT:
490 fsqstat = compat_alloc_user_space(sizeof(struct fs_quota_stat));
491 compat_fsqstat = addr;
492 ret = sys_quotactl(cmd, special, id, fsqstat);
493 if (ret)
494 break;
495 ret = -EFAULT;
496 /* Copying qs_version, qs_flags, qs_pad */
497 if (copy_in_user(compat_fsqstat, fsqstat,
498 offsetof(struct compat_fs_quota_stat, qs_uquota)))
499 break;
500 /* Copying qs_uquota */
501 if (copy_in_user(&compat_fsqstat->qs_uquota,
502 &fsqstat->qs_uquota,
503 sizeof(compat_fsqstat->qs_uquota)) ||
504 get_user(data, &fsqstat->qs_uquota.qfs_nextents) ||
505 put_user(data, &compat_fsqstat->qs_uquota.qfs_nextents))
506 break;
507 /* Copying qs_gquota */
508 if (copy_in_user(&compat_fsqstat->qs_gquota,
509 &fsqstat->qs_gquota,
510 sizeof(compat_fsqstat->qs_gquota)) ||
511 get_user(data, &fsqstat->qs_gquota.qfs_nextents) ||
512 put_user(data, &compat_fsqstat->qs_gquota.qfs_nextents))
513 break;
514 /* Copying the rest */
515 if (copy_in_user(&compat_fsqstat->qs_incoredqs,
516 &fsqstat->qs_incoredqs,
517 sizeof(struct compat_fs_quota_stat) -
518 offsetof(struct compat_fs_quota_stat, qs_incoredqs)) ||
519 get_user(xdata, &fsqstat->qs_iwarnlimit) ||
520 put_user(xdata, &compat_fsqstat->qs_iwarnlimit))
521 break;
522 ret = 0;
523 break;
524 default:
525 ret = sys_quotactl(cmd, special, id, addr);
526 }
527 return ret; 340 return ret;
528} 341}
529#endif
530
531
532#ifdef CONFIG_QUOTA_NETLINK_INTERFACE
533
534/* Netlink family structure for quota */
535static struct genl_family quota_genl_family = {
536 .id = GENL_ID_GENERATE,
537 .hdrsize = 0,
538 .name = "VFS_DQUOT",
539 .version = 1,
540 .maxattr = QUOTA_NL_A_MAX,
541};
542
543/**
544 * quota_send_warning - Send warning to userspace about exceeded quota
545 * @type: The quota type: USRQQUOTA, GRPQUOTA,...
546 * @id: The user or group id of the quota that was exceeded
547 * @dev: The device on which the fs is mounted (sb->s_dev)
548 * @warntype: The type of the warning: QUOTA_NL_...
549 *
550 * This can be used by filesystems (including those which don't use
551 * dquot) to send a message to userspace relating to quota limits.
552 *
553 */
554
555void quota_send_warning(short type, unsigned int id, dev_t dev,
556 const char warntype)
557{
558 static atomic_t seq;
559 struct sk_buff *skb;
560 void *msg_head;
561 int ret;
562 int msg_size = 4 * nla_total_size(sizeof(u32)) +
563 2 * nla_total_size(sizeof(u64));
564
565 /* We have to allocate using GFP_NOFS as we are called from a
566 * filesystem performing write and thus further recursion into
567 * the fs to free some data could cause deadlocks. */
568 skb = genlmsg_new(msg_size, GFP_NOFS);
569 if (!skb) {
570 printk(KERN_ERR
571 "VFS: Not enough memory to send quota warning.\n");
572 return;
573 }
574 msg_head = genlmsg_put(skb, 0, atomic_add_return(1, &seq),
575 &quota_genl_family, 0, QUOTA_NL_C_WARNING);
576 if (!msg_head) {
577 printk(KERN_ERR
578 "VFS: Cannot store netlink header in quota warning.\n");
579 goto err_out;
580 }
581 ret = nla_put_u32(skb, QUOTA_NL_A_QTYPE, type);
582 if (ret)
583 goto attr_err_out;
584 ret = nla_put_u64(skb, QUOTA_NL_A_EXCESS_ID, id);
585 if (ret)
586 goto attr_err_out;
587 ret = nla_put_u32(skb, QUOTA_NL_A_WARNING, warntype);
588 if (ret)
589 goto attr_err_out;
590 ret = nla_put_u32(skb, QUOTA_NL_A_DEV_MAJOR, MAJOR(dev));
591 if (ret)
592 goto attr_err_out;
593 ret = nla_put_u32(skb, QUOTA_NL_A_DEV_MINOR, MINOR(dev));
594 if (ret)
595 goto attr_err_out;
596 ret = nla_put_u64(skb, QUOTA_NL_A_CAUSED_ID, current_uid());
597 if (ret)
598 goto attr_err_out;
599 genlmsg_end(skb, msg_head);
600
601 genlmsg_multicast(skb, 0, quota_genl_family.id, GFP_NOFS);
602 return;
603attr_err_out:
604 printk(KERN_ERR "VFS: Not enough space to compose quota message!\n");
605err_out:
606 kfree_skb(skb);
607}
608EXPORT_SYMBOL(quota_send_warning);
609
610static int __init quota_init(void)
611{
612 if (genl_register_family(&quota_genl_family) != 0)
613 printk(KERN_ERR
614 "VFS: Failed to create quota netlink interface.\n");
615 return 0;
616};
617
618module_init(quota_init);
619#endif
620
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-02 05:23:31 -0400