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

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

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