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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 const 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_ */