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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 | void 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_mark_dquot_dirty(struct dquot *dquot); | |
86 | ||
87 | int dquot_file_open(struct inode *inode, struct file *file); | |
88 | ||
89 | int dquot_enable(struct inode *inode, int type, int format_id, | |
90 | unsigned int flags); | |
91 | int dquot_quota_on(struct super_block *sb, int type, int format_id, | |
92 | struct path *path); | |
93 | int dquot_quota_on_mount(struct super_block *sb, char *qf_name, | |
94 | int format_id, int type); | |
95 | int dquot_quota_off(struct super_block *sb, int type); | |
96 | int dquot_writeback_dquots(struct super_block *sb, int type); | |
97 | int dquot_quota_sync(struct super_block *sb, int type); | |
98 | int dquot_get_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii); | |
99 | int dquot_set_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii); | |
100 | int dquot_get_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 | unsigned type, tmsk = 0; | |
138 | for (type = 0; type < MAXQUOTAS; type++) | |
139 | tmsk |= sb_has_quota_suspended(sb, type) << type; | |
140 | return tmsk; | |
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 | unsigned type, tmsk = 0; | |
153 | for (type = 0; type < MAXQUOTAS; type++) | |
154 | tmsk |= sb_has_quota_loaded(sb, type) << type; | |
155 | return tmsk; | |
156 | } | |
157 | ||
158 | static inline bool sb_has_quota_active(struct super_block *sb, int type) | |
159 | { | |
160 | return sb_has_quota_loaded(sb, type) && | |
161 | !sb_has_quota_suspended(sb, type); | |
162 | } | |
163 | ||
164 | /* | |
165 | * Operations supported for diskquotas. | |
166 | */ | |
167 | extern const struct dquot_operations dquot_operations; | |
168 | extern const struct quotactl_ops dquot_quotactl_ops; | |
169 | extern const struct quotactl_ops dquot_quotactl_sysfile_ops; | |
170 | ||
171 | #else | |
172 | ||
173 | static inline int sb_has_quota_usage_enabled(struct super_block *sb, int type) | |
174 | { | |
175 | return 0; | |
176 | } | |
177 | ||
178 | static inline int sb_has_quota_limits_enabled(struct super_block *sb, int type) | |
179 | { | |
180 | return 0; | |
181 | } | |
182 | ||
183 | static inline int sb_has_quota_suspended(struct super_block *sb, int type) | |
184 | { | |
185 | return 0; | |
186 | } | |
187 | ||
188 | static inline int sb_any_quota_suspended(struct super_block *sb) | |
189 | { | |
190 | return 0; | |
191 | } | |
192 | ||
193 | /* Does kernel know about any quota information for given sb + type? */ | |
194 | static inline int sb_has_quota_loaded(struct super_block *sb, int type) | |
195 | { | |
196 | return 0; | |
197 | } | |
198 | ||
199 | static inline int sb_any_quota_loaded(struct super_block *sb) | |
200 | { | |
201 | return 0; | |
202 | } | |
203 | ||
204 | static inline int sb_has_quota_active(struct super_block *sb, int type) | |
205 | { | |
206 | return 0; | |
207 | } | |
208 | ||
209 | static inline void dquot_initialize(struct inode *inode) | |
210 | { | |
211 | } | |
212 | ||
213 | static inline void dquot_drop(struct inode *inode) | |
214 | { | |
215 | } | |
216 | ||
217 | static inline int dquot_alloc_inode(struct inode *inode) | |
218 | { | |
219 | return 0; | |
220 | } | |
221 | ||
222 | static inline void dquot_free_inode(struct inode *inode) | |
223 | { | |
224 | } | |
225 | ||
226 | static inline int dquot_transfer(struct inode *inode, struct iattr *iattr) | |
227 | { | |
228 | return 0; | |
229 | } | |
230 | ||
231 | static inline int __dquot_alloc_space(struct inode *inode, qsize_t number, | |
232 | int flags) | |
233 | { | |
234 | if (!(flags & DQUOT_SPACE_RESERVE)) | |
235 | inode_add_bytes(inode, number); | |
236 | return 0; | |
237 | } | |
238 | ||
239 | static inline void __dquot_free_space(struct inode *inode, qsize_t number, | |
240 | int flags) | |
241 | { | |
242 | if (!(flags & DQUOT_SPACE_RESERVE)) | |
243 | inode_sub_bytes(inode, number); | |
244 | } | |
245 | ||
246 | static inline int dquot_claim_space_nodirty(struct inode *inode, qsize_t number) | |
247 | { | |
248 | inode_add_bytes(inode, number); | |
249 | return 0; | |
250 | } | |
251 | ||
252 | static inline int dquot_reclaim_space_nodirty(struct inode *inode, | |
253 | qsize_t number) | |
254 | { | |
255 | inode_sub_bytes(inode, number); | |
256 | return 0; | |
257 | } | |
258 | ||
259 | static inline int dquot_disable(struct super_block *sb, int type, | |
260 | unsigned int flags) | |
261 | { | |
262 | return 0; | |
263 | } | |
264 | ||
265 | static inline int dquot_suspend(struct super_block *sb, int type) | |
266 | { | |
267 | return 0; | |
268 | } | |
269 | ||
270 | static inline int dquot_resume(struct super_block *sb, int type) | |
271 | { | |
272 | return 0; | |
273 | } | |
274 | ||
275 | #define dquot_file_open generic_file_open | |
276 | ||
277 | static inline int dquot_writeback_dquots(struct super_block *sb, int type) | |
278 | { | |
279 | return 0; | |
280 | } | |
281 | ||
282 | #endif /* CONFIG_QUOTA */ | |
283 | ||
284 | static inline int dquot_alloc_space_nodirty(struct inode *inode, qsize_t nr) | |
285 | { | |
286 | return __dquot_alloc_space(inode, nr, DQUOT_SPACE_WARN); | |
287 | } | |
288 | ||
289 | static inline void dquot_alloc_space_nofail(struct inode *inode, qsize_t nr) | |
290 | { | |
291 | __dquot_alloc_space(inode, nr, DQUOT_SPACE_WARN|DQUOT_SPACE_NOFAIL); | |
292 | mark_inode_dirty_sync(inode); | |
293 | } | |
294 | ||
295 | static inline int dquot_alloc_space(struct inode *inode, qsize_t nr) | |
296 | { | |
297 | int ret; | |
298 | ||
299 | ret = dquot_alloc_space_nodirty(inode, nr); | |
300 | if (!ret) { | |
301 | /* | |
302 | * Mark inode fully dirty. Since we are allocating blocks, inode | |
303 | * would become fully dirty soon anyway and it reportedly | |
304 | * reduces lock contention. | |
305 | */ | |
306 | mark_inode_dirty(inode); | |
307 | } | |
308 | return ret; | |
309 | } | |
310 | ||
311 | static inline int dquot_alloc_block_nodirty(struct inode *inode, qsize_t nr) | |
312 | { | |
313 | return dquot_alloc_space_nodirty(inode, nr << inode->i_blkbits); | |
314 | } | |
315 | ||
316 | static inline void dquot_alloc_block_nofail(struct inode *inode, qsize_t nr) | |
317 | { | |
318 | dquot_alloc_space_nofail(inode, nr << inode->i_blkbits); | |
319 | } | |
320 | ||
321 | static inline int dquot_alloc_block(struct inode *inode, qsize_t nr) | |
322 | { | |
323 | return dquot_alloc_space(inode, nr << inode->i_blkbits); | |
324 | } | |
325 | ||
326 | static inline int dquot_prealloc_block_nodirty(struct inode *inode, qsize_t nr) | |
327 | { | |
328 | return __dquot_alloc_space(inode, nr << inode->i_blkbits, 0); | |
329 | } | |
330 | ||
331 | static inline int dquot_prealloc_block(struct inode *inode, qsize_t nr) | |
332 | { | |
333 | int ret; | |
334 | ||
335 | ret = dquot_prealloc_block_nodirty(inode, nr); | |
336 | if (!ret) | |
337 | mark_inode_dirty_sync(inode); | |
338 | return ret; | |
339 | } | |
340 | ||
341 | static inline int dquot_reserve_block(struct inode *inode, qsize_t nr) | |
342 | { | |
343 | return __dquot_alloc_space(inode, nr << inode->i_blkbits, | |
344 | DQUOT_SPACE_WARN|DQUOT_SPACE_RESERVE); | |
345 | } | |
346 | ||
347 | static inline int dquot_claim_block(struct inode *inode, qsize_t nr) | |
348 | { | |
349 | int ret; | |
350 | ||
351 | ret = dquot_claim_space_nodirty(inode, nr << inode->i_blkbits); | |
352 | if (!ret) | |
353 | mark_inode_dirty_sync(inode); | |
354 | return ret; | |
355 | } | |
356 | ||
357 | static inline void dquot_reclaim_block(struct inode *inode, qsize_t nr) | |
358 | { | |
359 | dquot_reclaim_space_nodirty(inode, nr << inode->i_blkbits); | |
360 | mark_inode_dirty_sync(inode); | |
361 | } | |
362 | ||
363 | static inline void dquot_free_space_nodirty(struct inode *inode, qsize_t nr) | |
364 | { | |
365 | __dquot_free_space(inode, nr, 0); | |
366 | } | |
367 | ||
368 | static inline void dquot_free_space(struct inode *inode, qsize_t nr) | |
369 | { | |
370 | dquot_free_space_nodirty(inode, nr); | |
371 | mark_inode_dirty_sync(inode); | |
372 | } | |
373 | ||
374 | static inline void dquot_free_block_nodirty(struct inode *inode, qsize_t nr) | |
375 | { | |
376 | dquot_free_space_nodirty(inode, nr << inode->i_blkbits); | |
377 | } | |
378 | ||
379 | static inline void dquot_free_block(struct inode *inode, qsize_t nr) | |
380 | { | |
381 | dquot_free_space(inode, nr << inode->i_blkbits); | |
382 | } | |
383 | ||
384 | static inline void dquot_release_reservation_block(struct inode *inode, | |
385 | qsize_t nr) | |
386 | { | |
387 | __dquot_free_space(inode, nr << inode->i_blkbits, DQUOT_SPACE_RESERVE); | |
388 | } | |
389 | ||
390 | unsigned int qtype_enforce_flag(int type); | |
391 | ||
392 | #endif /* _LINUX_QUOTAOPS_ */ |