1 /*
2 * Definitions for diskquota-operations. When diskquota is configured these
3 * macros expand to the right source-code.
4 *
5 * Author: Marco van Wieringen <mvw@planets.elm.net>
6 */
7 #ifndef _LINUX_QUOTAOPS_
8 #define _LINUX_QUOTAOPS_
9
10 #include <linux/fs.h>
11
12 static inline struct quota_info *sb_dqopt(struct super_block *sb)
13 {
14 return &sb->s_dquot;
15 }
16
17 #if defined(CONFIG_QUOTA)
18
19 /*
20 * declaration of quota_function calls in kernel.
21 */
22 void sync_quota_sb(struct super_block *sb, int type);
23 static inline void writeout_quota_sb(struct super_block *sb, int type)
24 {
25 if (sb->s_qcop->quota_sync)
26 sb->s_qcop->quota_sync(sb, type);
27 }
28
29 int dquot_initialize(struct inode *inode, int type);
30 int dquot_drop(struct inode *inode);
31 struct dquot *dqget(struct super_block *sb, unsigned int id, int type);
32 void dqput(struct dquot *dquot);
33 int dquot_scan_active(struct super_block *sb,
34 int (*fn)(struct dquot *dquot, unsigned long priv),
35 unsigned long priv);
36 struct dquot *dquot_alloc(struct super_block *sb, int type);
37 void dquot_destroy(struct dquot *dquot);
38
39 int dquot_alloc_space(struct inode *inode, qsize_t number, int prealloc);
40 int dquot_alloc_inode(const struct inode *inode, qsize_t number);
41
42 int dquot_reserve_space(struct inode *inode, qsize_t number, int prealloc);
43 int dquot_claim_space(struct inode *inode, qsize_t number);
44 void dquot_release_reserved_space(struct inode *inode, qsize_t number);
45 qsize_t dquot_get_reserved_space(struct inode *inode);
46
47 int dquot_free_space(struct inode *inode, qsize_t number);
48 int dquot_free_inode(const struct inode *inode, qsize_t number);
49
50 int dquot_transfer(struct inode *inode, struct iattr *iattr);
51 int dquot_commit(struct dquot *dquot);
52 int dquot_acquire(struct dquot *dquot);
53 int dquot_release(struct dquot *dquot);
54 int dquot_commit_info(struct super_block *sb, int type);
55 int dquot_mark_dquot_dirty(struct dquot *dquot);
56
57 int vfs_quota_on(struct super_block *sb, int type, int format_id,
58 char *path, int remount);
59 int vfs_quota_enable(struct inode *inode, int type, int format_id,
60 unsigned int flags);
61 int vfs_quota_on_path(struct super_block *sb, int type, int format_id,
62 struct path *path);
63 int vfs_quota_on_mount(struct super_block *sb, char *qf_name,
64 int format_id, int type);
65 int vfs_quota_off(struct super_block *sb, int type, int remount);
66 int vfs_quota_disable(struct super_block *sb, int type, unsigned int flags);
67 int vfs_quota_sync(struct super_block *sb, int type);
68 int vfs_get_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii);
69 int vfs_set_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii);
70 int vfs_get_dqblk(struct super_block *sb, int type, qid_t id, struct if_dqblk *di);
71 int vfs_set_dqblk(struct super_block *sb, int type, qid_t id, struct if_dqblk *di);
72
73 void vfs_dq_drop(struct inode *inode);
74 int vfs_dq_transfer(struct inode *inode, struct iattr *iattr);
75 int vfs_dq_quota_on_remount(struct super_block *sb);
76
77 static inline struct mem_dqinfo *sb_dqinfo(struct super_block *sb, int type)
78 {
79 return sb_dqopt(sb)->info + type;
80 }
81
82 /*
83 * Functions for checking status of quota
84 */
85
86 static inline int sb_has_quota_usage_enabled(struct super_block *sb, int type)
87 {
88 return sb_dqopt(sb)->flags &
89 dquot_state_flag(DQUOT_USAGE_ENABLED, type);
90 }
91
92 static inline int sb_has_quota_limits_enabled(struct super_block *sb, int type)
93 {
94 return sb_dqopt(sb)->flags &
95 dquot_state_flag(DQUOT_LIMITS_ENABLED, type);
96 }
97
98 static inline int sb_has_quota_suspended(struct super_block *sb, int type)
99 {
100 return sb_dqopt(sb)->flags &
101 dquot_state_flag(DQUOT_SUSPENDED, type);
102 }
103
104 static inline int sb_any_quota_suspended(struct super_block *sb)
105 {
106 return sb_has_quota_suspended(sb, USRQUOTA) ||
107 sb_has_quota_suspended(sb, GRPQUOTA);
108 }
109
110 /* Does kernel know about any quota information for given sb + type? */
111 static inline int sb_has_quota_loaded(struct super_block *sb, int type)
112 {
113 /* Currently if anything is on, then quota usage is on as well */
114 return sb_has_quota_usage_enabled(sb, type);
115 }
116
117 static inline int sb_any_quota_loaded(struct super_block *sb)
118 {
119 return sb_has_quota_loaded(sb, USRQUOTA) ||
120 sb_has_quota_loaded(sb, GRPQUOTA);
121 }
122
123 static inline int sb_has_quota_active(struct super_block *sb, int type)
124 {
125 return sb_has_quota_loaded(sb, type) &&
126 !sb_has_quota_suspended(sb, type);
127 }
128
129 static inline int sb_any_quota_active(struct super_block *sb)
130 {
131 return sb_has_quota_active(sb, USRQUOTA) ||
132 sb_has_quota_active(sb, GRPQUOTA);
133 }
134
135 /*
136 * Operations supported for diskquotas.
137 */
138 extern struct dquot_operations dquot_operations;
139 extern struct quotactl_ops vfs_quotactl_ops;
140
141 #define sb_dquot_ops (&dquot_operations)
142 #define sb_quotactl_ops (&vfs_quotactl_ops)
143
144 /* It is better to call this function outside of any transaction as it might
145 * need a lot of space in journal for dquot structure allocation. */
146 static inline void vfs_dq_init(struct inode *inode)
147 {
148 BUG_ON(!inode->i_sb);
149 if (sb_any_quota_active(inode->i_sb) && !IS_NOQUOTA(inode))
150 inode->i_sb->dq_op->initialize(inode, -1);
151 }
152
153 /* The following allocation/freeing/transfer functions *must* be called inside
154 * a transaction (deadlocks possible otherwise) */
155 static inline int vfs_dq_prealloc_space_nodirty(struct inode *inode, qsize_t nr)
156 {
157 if (sb_any_quota_active(inode->i_sb)) {
158 /* Used space is updated in alloc_space() */
159 if (inode->i_sb->dq_op->alloc_space(inode, nr, 1) == NO_QUOTA)
160 return 1;
161 }
162 else
163 inode_add_bytes(inode, nr);
164 return 0;
165 }
166
167 static inline int vfs_dq_prealloc_space(struct inode *inode, qsize_t nr)
168 {
169 int ret;
170 if (!(ret = vfs_dq_prealloc_space_nodirty(inode, nr)))
171 mark_inode_dirty(inode);
172 return ret;
173 }
174
175 static inline int vfs_dq_alloc_space_nodirty(struct inode *inode, qsize_t nr)
176 {
177 if (sb_any_quota_active(inode->i_sb)) {
178 /* Used space is updated in alloc_space() */
179 if (inode->i_sb->dq_op->alloc_space(inode, nr, 0) == NO_QUOTA)
180 return 1;
181 }
182 else
183 inode_add_bytes(inode, nr);
184 return 0;
185 }
186
187 static inline int vfs_dq_alloc_space(struct inode *inode, qsize_t nr)
188 {
189 int ret;
190 if (!(ret = vfs_dq_alloc_space_nodirty(inode, nr)))
191 mark_inode_dirty(inode);
192 return ret;
193 }
194
195 static inline int vfs_dq_reserve_space(struct inode *inode, qsize_t nr)
196 {
197 if (sb_any_quota_active(inode->i_sb)) {
198 /* Used space is updated in alloc_space() */
199 if (inode->i_sb->dq_op->reserve_space(inode, nr, 0) == NO_QUOTA)
200 return 1;
201 }
202 return 0;
203 }
204
205 static inline int vfs_dq_alloc_inode(struct inode *inode)
206 {
207 if (sb_any_quota_active(inode->i_sb)) {
208 vfs_dq_init(inode);
209 if (inode->i_sb->dq_op->alloc_inode(inode, 1) == NO_QUOTA)
210 return 1;
211 }
212 return 0;
213 }
214
215 /*
216 * Convert in-memory reserved quotas to real consumed quotas
217 */
218 static inline int vfs_dq_claim_space(struct inode *inode, qsize_t nr)
219 {
220 if (sb_any_quota_active(inode->i_sb)) {
221 if (inode->i_sb->dq_op->claim_space(inode, nr) == NO_QUOTA)
222 return 1;
223 } else
224 inode_add_bytes(inode, nr);
225
226 mark_inode_dirty(inode);
227 return 0;
228 }
229
230 /*
231 * Release reserved (in-memory) quotas
232 */
233 static inline
234 void vfs_dq_release_reservation_space(struct inode *inode, qsize_t nr)
235 {
236 if (sb_any_quota_active(inode->i_sb))
237 inode->i_sb->dq_op->release_rsv(inode, nr);
238 }
239
240 static inline void vfs_dq_free_space_nodirty(struct inode *inode, qsize_t nr)
241 {
242 if (sb_any_quota_active(inode->i_sb))
243 inode->i_sb->dq_op->free_space(inode, nr);
244 else
245 inode_sub_bytes(inode, nr);
246 }
247
248 static inline void vfs_dq_free_space(struct inode *inode, qsize_t nr)
249 {
250 vfs_dq_free_space_nodirty(inode, nr);
251 mark_inode_dirty(inode);
252 }
253
254 static inline void vfs_dq_free_inode(struct inode *inode)
255 {
256 if (sb_any_quota_active(inode->i_sb))
257 inode->i_sb->dq_op->free_inode(inode, 1);
258 }
259
260 /* Cannot be called inside a transaction */
261 static inline int vfs_dq_off(struct super_block *sb, int remount)
262 {
263 int ret = -ENOSYS;
264
265 if (sb->s_qcop && sb->s_qcop->quota_off)
266 ret = sb->s_qcop->quota_off(sb, -1, remount);
267 return ret;
268 }
269
270 #else
271
272 static inline int sb_has_quota_usage_enabled(struct super_block *sb, int type)
273 {
274 return 0;
275 }
276
277 static inline int sb_has_quota_limits_enabled(struct super_block *sb, int type)
278 {
279 return 0;
280 }
281
282 static inline int sb_has_quota_suspended(struct super_block *sb, int type)
283 {
284 return 0;
285 }
286
287 static inline int sb_any_quota_suspended(struct super_block *sb)
288 {
289 return 0;
290 }
291
292 /* Does kernel know about any quota information for given sb + type? */
293 static inline int sb_has_quota_loaded(struct super_block *sb, int type)
294 {
295 return 0;
296 }
297
298 static inline int sb_any_quota_loaded(struct super_block *sb)
299 {
300 return 0;
301 }
302
303 static inline int sb_has_quota_active(struct super_block *sb, int type)
304 {
305 return 0;
306 }
307
308 static inline int sb_any_quota_active(struct super_block *sb)
309 {
310 return 0;
311 }
312
313 /*
314 * NO-OP when quota not configured.
315 */
316 #define sb_dquot_ops (NULL)
317 #define sb_quotactl_ops (NULL)
318
319 static inline void vfs_dq_init(struct inode *inode)
320 {
321 }
322
323 static inline void vfs_dq_drop(struct inode *inode)
324 {
325 }
326
327 static inline int vfs_dq_alloc_inode(struct inode *inode)
328 {
329 return 0;
330 }
331
332 static inline void vfs_dq_free_inode(struct inode *inode)
333 {
334 }
335
336 static inline void sync_quota_sb(struct super_block *sb, int type)
337 {
338 }
339
340 static inline void writeout_quota_sb(struct super_block *sb, int type)
341 {
342 }
343
344 static inline int vfs_dq_off(struct super_block *sb, int remount)
345 {
346 return 0;
347 }
348
349 static inline int vfs_dq_quota_on_remount(struct super_block *sb)
350 {
351 return 0;
352 }
353
354 static inline int vfs_dq_transfer(struct inode *inode, struct iattr *iattr)
355 {
356 return 0;
357 }
358
359 static inline int vfs_dq_prealloc_space_nodirty(struct inode *inode, qsize_t nr)
360 {
361 inode_add_bytes(inode, nr);
362 return 0;
363 }
364
365 static inline int vfs_dq_prealloc_space(struct inode *inode, qsize_t nr)
366 {
367 vfs_dq_prealloc_space_nodirty(inode, nr);
368 mark_inode_dirty(inode);
369 return 0;
370 }
371
372 static inline int vfs_dq_alloc_space_nodirty(struct inode *inode, qsize_t nr)
373 {
374 inode_add_bytes(inode, nr);
375 return 0;
376 }
377
378 static inline int vfs_dq_alloc_space(struct inode *inode, qsize_t nr)
379 {
380 vfs_dq_alloc_space_nodirty(inode, nr);
381 mark_inode_dirty(inode);
382 return 0;
383 }
384
385 static inline int vfs_dq_reserve_space(struct inode *inode, qsize_t nr)
386 {
387 return 0;
388 }
389
390 static inline int vfs_dq_claim_space(struct inode *inode, qsize_t nr)
391 {
392 return vfs_dq_alloc_space(inode, nr);
393 }
394
395 static inline
396 int vfs_dq_release_reservation_space(struct inode *inode, qsize_t nr)
397 {
398 return 0;
399 }
400
401 static inline void vfs_dq_free_space_nodirty(struct inode *inode, qsize_t nr)
402 {
403 inode_sub_bytes(inode, nr);
404 }
405
406 static inline void vfs_dq_free_space(struct inode *inode, qsize_t nr)
407 {
408 vfs_dq_free_space_nodirty(inode, nr);
409 mark_inode_dirty(inode);
410 }
411
412 #endif /* CONFIG_QUOTA */
413
414 static inline int vfs_dq_prealloc_block_nodirty(struct inode *inode, qsize_t nr)
415 {
416 return vfs_dq_prealloc_space_nodirty(inode, nr << inode->i_blkbits);
417 }
418
419 static inline int vfs_dq_prealloc_block(struct inode *inode, qsize_t nr)
420 {
421 return vfs_dq_prealloc_space(inode, nr << inode->i_blkbits);
422 }
423
424 static inline int vfs_dq_alloc_block_nodirty(struct inode *inode, qsize_t nr)
425 {
426 return vfs_dq_alloc_space_nodirty(inode, nr << inode->i_blkbits);
427 }
428
429 static inline int vfs_dq_alloc_block(struct inode *inode, qsize_t nr)
430 {
431 return vfs_dq_alloc_space(inode, nr << inode->i_blkbits);
432 }
433
434 static inline int vfs_dq_reserve_block(struct inode *inode, qsize_t nr)
435 {
436 return vfs_dq_reserve_space(inode, nr << inode->i_blkbits);
437 }
438
439 static inline int vfs_dq_claim_block(struct inode *inode, qsize_t nr)
440 {
441 return vfs_dq_claim_space(inode, nr << inode->i_blkbits);
442 }
443
444 static inline
445 void vfs_dq_release_reservation_block(struct inode *inode, qsize_t nr)
446 {
447 vfs_dq_release_reservation_space(inode, nr << inode->i_blkbits);
448 }
449
450 static inline void vfs_dq_free_block_nodirty(struct inode *inode, qsize_t nr)
451 {
452 vfs_dq_free_space_nodirty(inode, nr << inode->i_blkbits);
453 }
454
455 static inline void vfs_dq_free_block(struct inode *inode, qsize_t nr)
456 {
457 vfs_dq_free_space(inode, nr << inode->i_blkbits);
458 }
459
460 #endif /* _LINUX_QUOTAOPS_ */
461
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