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TOMOYO Linux Cross Reference
Linux/include/linux/quotaops.h

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 /*
  3  * Definitions for diskquota-operations. When diskquota is configured these
  4  * macros expand to the right source-code.
  5  *
  6  * Author:  Marco van Wieringen <mvw@planets.elm.net>
  7  */
  8 #ifndef _LINUX_QUOTAOPS_
  9 #define _LINUX_QUOTAOPS_
 10 
 11 #include <linux/fs.h>
 12 
 13 #define DQUOT_SPACE_WARN        0x1
 14 #define DQUOT_SPACE_RESERVE     0x2
 15 #define DQUOT_SPACE_NOFAIL      0x4
 16 
 17 static inline struct quota_info *sb_dqopt(struct super_block *sb)
 18 {
 19         return &sb->s_dquot;
 20 }
 21 
 22 /* i_mutex must being held */
 23 static inline bool is_quota_modification(struct inode *inode, struct iattr *ia)
 24 {
 25         return (ia->ia_valid & ATTR_SIZE && ia->ia_size != inode->i_size) ||
 26                 (ia->ia_valid & ATTR_UID && !uid_eq(ia->ia_uid, inode->i_uid)) ||
 27                 (ia->ia_valid & ATTR_GID && !gid_eq(ia->ia_gid, inode->i_gid));
 28 }
 29 
 30 #if defined(CONFIG_QUOTA)
 31 
 32 #define quota_error(sb, fmt, args...) \
 33         __quota_error((sb), __func__, fmt , ## args)
 34 
 35 extern __printf(3, 4)
 36 void __quota_error(struct super_block *sb, const char *func,
 37                    const char *fmt, ...);
 38 
 39 /*
 40  * declaration of quota_function calls in kernel.
 41  */
 42 int dquot_initialize(struct inode *inode);
 43 bool dquot_initialize_needed(struct inode *inode);
 44 void dquot_drop(struct inode *inode);
 45 struct dquot *dqget(struct super_block *sb, struct kqid qid);
 46 static inline struct dquot *dqgrab(struct dquot *dquot)
 47 {
 48         /* Make sure someone else has active reference to dquot */
 49         WARN_ON_ONCE(!atomic_read(&dquot->dq_count));
 50         WARN_ON_ONCE(!test_bit(DQ_ACTIVE_B, &dquot->dq_flags));
 51         atomic_inc(&dquot->dq_count);
 52         return dquot;
 53 }
 54 void dqput(struct dquot *dquot);
 55 int dquot_scan_active(struct super_block *sb,
 56                       int (*fn)(struct dquot *dquot, unsigned long priv),
 57                       unsigned long priv);
 58 struct dquot *dquot_alloc(struct super_block *sb, int type);
 59 void dquot_destroy(struct dquot *dquot);
 60 
 61 int __dquot_alloc_space(struct inode *inode, qsize_t number, int flags);
 62 void __dquot_free_space(struct inode *inode, qsize_t number, int flags);
 63 
 64 int dquot_alloc_inode(struct inode *inode);
 65 
 66 int dquot_claim_space_nodirty(struct inode *inode, qsize_t number);
 67 void dquot_free_inode(struct inode *inode);
 68 void dquot_reclaim_space_nodirty(struct inode *inode, qsize_t number);
 69 
 70 int dquot_disable(struct super_block *sb, int type, unsigned int flags);
 71 /* Suspend quotas on remount RO */
 72 static inline int dquot_suspend(struct super_block *sb, int type)
 73 {
 74         return dquot_disable(sb, type, DQUOT_SUSPENDED);
 75 }
 76 int dquot_resume(struct super_block *sb, int type);
 77 
 78 int dquot_commit(struct dquot *dquot);
 79 int dquot_acquire(struct dquot *dquot);
 80 int dquot_release(struct dquot *dquot);
 81 int dquot_commit_info(struct super_block *sb, int type);
 82 int dquot_get_next_id(struct super_block *sb, struct kqid *qid);
 83 int dquot_mark_dquot_dirty(struct dquot *dquot);
 84 
 85 int dquot_file_open(struct inode *inode, struct file *file);
 86 
 87 int dquot_enable(struct inode *inode, int type, int format_id,
 88         unsigned int flags);
 89 int dquot_quota_on(struct super_block *sb, int type, int format_id,
 90         const struct path *path);
 91 int dquot_quota_on_mount(struct super_block *sb, char *qf_name,
 92         int format_id, int type);
 93 int dquot_quota_off(struct super_block *sb, int type);
 94 int dquot_writeback_dquots(struct super_block *sb, int type);
 95 int dquot_quota_sync(struct super_block *sb, int type);
 96 int dquot_get_state(struct super_block *sb, struct qc_state *state);
 97 int dquot_set_dqinfo(struct super_block *sb, int type, struct qc_info *ii);
 98 int dquot_get_dqblk(struct super_block *sb, struct kqid id,
 99                 struct qc_dqblk *di);
100 int dquot_get_next_dqblk(struct super_block *sb, struct kqid *id,
101                 struct qc_dqblk *di);
102 int dquot_set_dqblk(struct super_block *sb, struct kqid id,
103                 struct qc_dqblk *di);
104 
105 int __dquot_transfer(struct inode *inode, struct dquot **transfer_to);
106 int dquot_transfer(struct inode *inode, struct iattr *iattr);
107 
108 static inline struct mem_dqinfo *sb_dqinfo(struct super_block *sb, int type)
109 {
110         return sb_dqopt(sb)->info + type;
111 }
112 
113 /*
114  * Functions for checking status of quota
115  */
116 
117 static inline bool sb_has_quota_usage_enabled(struct super_block *sb, int type)
118 {
119         return sb_dqopt(sb)->flags &
120                                 dquot_state_flag(DQUOT_USAGE_ENABLED, type);
121 }
122 
123 static inline bool sb_has_quota_limits_enabled(struct super_block *sb, int type)
124 {
125         return sb_dqopt(sb)->flags &
126                                 dquot_state_flag(DQUOT_LIMITS_ENABLED, type);
127 }
128 
129 static inline bool sb_has_quota_suspended(struct super_block *sb, int type)
130 {
131         return sb_dqopt(sb)->flags &
132                                 dquot_state_flag(DQUOT_SUSPENDED, type);
133 }
134 
135 static inline unsigned sb_any_quota_suspended(struct super_block *sb)
136 {
137         return dquot_state_types(sb_dqopt(sb)->flags, DQUOT_SUSPENDED);
138 }
139 
140 /* Does kernel know about any quota information for given sb + type? */
141 static inline bool sb_has_quota_loaded(struct super_block *sb, int type)
142 {
143         /* Currently if anything is on, then quota usage is on as well */
144         return sb_has_quota_usage_enabled(sb, type);
145 }
146 
147 static inline unsigned sb_any_quota_loaded(struct super_block *sb)
148 {
149         return dquot_state_types(sb_dqopt(sb)->flags, DQUOT_USAGE_ENABLED);
150 }
151 
152 static inline bool sb_has_quota_active(struct super_block *sb, int type)
153 {
154         return sb_has_quota_loaded(sb, type) &&
155                !sb_has_quota_suspended(sb, type);
156 }
157 
158 /*
159  * Operations supported for diskquotas.
160  */
161 extern const struct dquot_operations dquot_operations;
162 extern const struct quotactl_ops dquot_quotactl_sysfile_ops;
163 
164 #else
165 
166 static inline int sb_has_quota_usage_enabled(struct super_block *sb, int type)
167 {
168         return 0;
169 }
170 
171 static inline int sb_has_quota_limits_enabled(struct super_block *sb, int type)
172 {
173         return 0;
174 }
175 
176 static inline int sb_has_quota_suspended(struct super_block *sb, int type)
177 {
178         return 0;
179 }
180 
181 static inline int sb_any_quota_suspended(struct super_block *sb)
182 {
183         return 0;
184 }
185 
186 /* Does kernel know about any quota information for given sb + type? */
187 static inline int sb_has_quota_loaded(struct super_block *sb, int type)
188 {
189         return 0;
190 }
191 
192 static inline int sb_any_quota_loaded(struct super_block *sb)
193 {
194         return 0;
195 }
196 
197 static inline int sb_has_quota_active(struct super_block *sb, int type)
198 {
199         return 0;
200 }
201 
202 static inline int dquot_initialize(struct inode *inode)
203 {
204         return 0;
205 }
206 
207 static inline bool dquot_initialize_needed(struct inode *inode)
208 {
209         return false;
210 }
211 
212 static inline void dquot_drop(struct inode *inode)
213 {
214 }
215 
216 static inline int dquot_alloc_inode(struct inode *inode)
217 {
218         return 0;
219 }
220 
221 static inline void dquot_free_inode(struct inode *inode)
222 {
223 }
224 
225 static inline int dquot_transfer(struct inode *inode, struct iattr *iattr)
226 {
227         return 0;
228 }
229 
230 static inline int __dquot_alloc_space(struct inode *inode, qsize_t number,
231                 int flags)
232 {
233         if (!(flags & DQUOT_SPACE_RESERVE))
234                 inode_add_bytes(inode, number);
235         return 0;
236 }
237 
238 static inline void __dquot_free_space(struct inode *inode, qsize_t number,
239                 int flags)
240 {
241         if (!(flags & DQUOT_SPACE_RESERVE))
242                 inode_sub_bytes(inode, number);
243 }
244 
245 static inline int dquot_claim_space_nodirty(struct inode *inode, qsize_t number)
246 {
247         inode_add_bytes(inode, number);
248         return 0;
249 }
250 
251 static inline int dquot_reclaim_space_nodirty(struct inode *inode,
252                                               qsize_t number)
253 {
254         inode_sub_bytes(inode, number);
255         return 0;
256 }
257 
258 static inline int dquot_disable(struct super_block *sb, int type,
259                 unsigned int flags)
260 {
261         return 0;
262 }
263 
264 static inline int dquot_suspend(struct super_block *sb, int type)
265 {
266         return 0;
267 }
268 
269 static inline int dquot_resume(struct super_block *sb, int type)
270 {
271         return 0;
272 }
273 
274 #define dquot_file_open         generic_file_open
275 
276 static inline int dquot_writeback_dquots(struct super_block *sb, int type)
277 {
278         return 0;
279 }
280 
281 #endif /* CONFIG_QUOTA */
282 
283 static inline int dquot_alloc_space_nodirty(struct inode *inode, qsize_t nr)
284 {
285         return __dquot_alloc_space(inode, nr, DQUOT_SPACE_WARN);
286 }
287 
288 static inline void dquot_alloc_space_nofail(struct inode *inode, qsize_t nr)
289 {
290         __dquot_alloc_space(inode, nr, DQUOT_SPACE_WARN|DQUOT_SPACE_NOFAIL);
291         mark_inode_dirty_sync(inode);
292 }
293 
294 static inline int dquot_alloc_space(struct inode *inode, qsize_t nr)
295 {
296         int ret;
297 
298         ret = dquot_alloc_space_nodirty(inode, nr);
299         if (!ret) {
300                 /*
301                  * Mark inode fully dirty. Since we are allocating blocks, inode
302                  * would become fully dirty soon anyway and it reportedly
303                  * reduces lock contention.
304                  */
305                 mark_inode_dirty(inode);
306         }
307         return ret;
308 }
309 
310 static inline int dquot_alloc_block_nodirty(struct inode *inode, qsize_t nr)
311 {
312         return dquot_alloc_space_nodirty(inode, nr << inode->i_blkbits);
313 }
314 
315 static inline void dquot_alloc_block_nofail(struct inode *inode, qsize_t nr)
316 {
317         dquot_alloc_space_nofail(inode, nr << inode->i_blkbits);
318 }
319 
320 static inline int dquot_alloc_block(struct inode *inode, qsize_t nr)
321 {
322         return dquot_alloc_space(inode, nr << inode->i_blkbits);
323 }
324 
325 static inline int dquot_prealloc_block_nodirty(struct inode *inode, qsize_t nr)
326 {
327         return __dquot_alloc_space(inode, nr << inode->i_blkbits, 0);
328 }
329 
330 static inline int dquot_prealloc_block(struct inode *inode, qsize_t nr)
331 {
332         int ret;
333 
334         ret = dquot_prealloc_block_nodirty(inode, nr);
335         if (!ret)
336                 mark_inode_dirty_sync(inode);
337         return ret;
338 }
339 
340 static inline int dquot_reserve_block(struct inode *inode, qsize_t nr)
341 {
342         return __dquot_alloc_space(inode, nr << inode->i_blkbits,
343                                 DQUOT_SPACE_WARN|DQUOT_SPACE_RESERVE);
344 }
345 
346 static inline int dquot_claim_block(struct inode *inode, qsize_t nr)
347 {
348         int ret;
349 
350         ret = dquot_claim_space_nodirty(inode, nr << inode->i_blkbits);
351         if (!ret)
352                 mark_inode_dirty_sync(inode);
353         return ret;
354 }
355 
356 static inline void dquot_reclaim_block(struct inode *inode, qsize_t nr)
357 {
358         dquot_reclaim_space_nodirty(inode, nr << inode->i_blkbits);
359         mark_inode_dirty_sync(inode);
360 }
361 
362 static inline void dquot_free_space_nodirty(struct inode *inode, qsize_t nr)
363 {
364         __dquot_free_space(inode, nr, 0);
365 }
366 
367 static inline void dquot_free_space(struct inode *inode, qsize_t nr)
368 {
369         dquot_free_space_nodirty(inode, nr);
370         mark_inode_dirty_sync(inode);
371 }
372 
373 static inline void dquot_free_block_nodirty(struct inode *inode, qsize_t nr)
374 {
375         dquot_free_space_nodirty(inode, nr << inode->i_blkbits);
376 }
377 
378 static inline void dquot_free_block(struct inode *inode, qsize_t nr)
379 {
380         dquot_free_space(inode, nr << inode->i_blkbits);
381 }
382 
383 static inline void dquot_release_reservation_block(struct inode *inode,
384                 qsize_t nr)
385 {
386         __dquot_free_space(inode, nr << inode->i_blkbits, DQUOT_SPACE_RESERVE);
387 }
388 
389 unsigned int qtype_enforce_flag(int type);
390 
391 #endif /* _LINUX_QUOTAOPS_ */
392 

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