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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_ */ |