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 mnt_idmap *idmap, |
24 | struct inode *inode, struct iattr *ia) |
25 | { |
26 | return ((ia->ia_valid & ATTR_SIZE) || |
27 | i_uid_needs_update(idmap, attr: ia, inode) || |
28 | i_gid_needs_update(idmap, attr: ia, inode)); |
29 | } |
30 | |
31 | #if defined(CONFIG_QUOTA) |
32 | |
33 | #define quota_error(sb, fmt, args...) \ |
34 | __quota_error((sb), __func__, fmt , ## args) |
35 | |
36 | extern __printf(3, 4) |
37 | void __quota_error(struct super_block *sb, const char *func, |
38 | const char *fmt, ...); |
39 | |
40 | /* |
41 | * declaration of quota_function calls in kernel. |
42 | */ |
43 | int dquot_initialize(struct inode *inode); |
44 | bool dquot_initialize_needed(struct inode *inode); |
45 | void dquot_drop(struct inode *inode); |
46 | struct dquot *dqget(struct super_block *sb, struct kqid qid); |
47 | static inline struct dquot *dqgrab(struct dquot *dquot) |
48 | { |
49 | /* Make sure someone else has active reference to dquot */ |
50 | WARN_ON_ONCE(!atomic_read(&dquot->dq_count)); |
51 | WARN_ON_ONCE(!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)); |
52 | atomic_inc(v: &dquot->dq_count); |
53 | return dquot; |
54 | } |
55 | |
56 | static inline bool dquot_is_busy(struct dquot *dquot) |
57 | { |
58 | if (test_bit(DQ_MOD_B, &dquot->dq_flags)) |
59 | return true; |
60 | if (atomic_read(v: &dquot->dq_count) > 0) |
61 | return true; |
62 | return false; |
63 | } |
64 | |
65 | void dqput(struct dquot *dquot); |
66 | int dquot_scan_active(struct super_block *sb, |
67 | int (*fn)(struct dquot *dquot, unsigned long priv), |
68 | unsigned long priv); |
69 | struct dquot *dquot_alloc(struct super_block *sb, int type); |
70 | void dquot_destroy(struct dquot *dquot); |
71 | |
72 | int __dquot_alloc_space(struct inode *inode, qsize_t number, int flags); |
73 | void __dquot_free_space(struct inode *inode, qsize_t number, int flags); |
74 | |
75 | int dquot_alloc_inode(struct inode *inode); |
76 | |
77 | int dquot_claim_space_nodirty(struct inode *inode, qsize_t number); |
78 | void dquot_free_inode(struct inode *inode); |
79 | void dquot_reclaim_space_nodirty(struct inode *inode, qsize_t number); |
80 | |
81 | int dquot_disable(struct super_block *sb, int type, unsigned int flags); |
82 | /* Suspend quotas on remount RO */ |
83 | static inline int dquot_suspend(struct super_block *sb, int type) |
84 | { |
85 | return dquot_disable(sb, type, DQUOT_SUSPENDED); |
86 | } |
87 | int dquot_resume(struct super_block *sb, int type); |
88 | |
89 | int dquot_commit(struct dquot *dquot); |
90 | int dquot_acquire(struct dquot *dquot); |
91 | int dquot_release(struct dquot *dquot); |
92 | int dquot_commit_info(struct super_block *sb, int type); |
93 | int dquot_get_next_id(struct super_block *sb, struct kqid *qid); |
94 | int dquot_mark_dquot_dirty(struct dquot *dquot); |
95 | |
96 | int dquot_file_open(struct inode *inode, struct file *file); |
97 | |
98 | int dquot_load_quota_sb(struct super_block *sb, int type, int format_id, |
99 | unsigned int flags); |
100 | int dquot_load_quota_inode(struct inode *inode, int type, int format_id, |
101 | unsigned int flags); |
102 | int dquot_quota_on(struct super_block *sb, int type, int format_id, |
103 | const struct path *path); |
104 | int dquot_quota_on_mount(struct super_block *sb, char *qf_name, |
105 | int format_id, int type); |
106 | int dquot_quota_off(struct super_block *sb, int type); |
107 | int dquot_writeback_dquots(struct super_block *sb, int type); |
108 | int dquot_quota_sync(struct super_block *sb, int type); |
109 | int dquot_get_state(struct super_block *sb, struct qc_state *state); |
110 | int dquot_set_dqinfo(struct super_block *sb, int type, struct qc_info *ii); |
111 | int dquot_get_dqblk(struct super_block *sb, struct kqid id, |
112 | struct qc_dqblk *di); |
113 | int dquot_get_next_dqblk(struct super_block *sb, struct kqid *id, |
114 | struct qc_dqblk *di); |
115 | int dquot_set_dqblk(struct super_block *sb, struct kqid id, |
116 | struct qc_dqblk *di); |
117 | |
118 | int __dquot_transfer(struct inode *inode, struct dquot **transfer_to); |
119 | int dquot_transfer(struct mnt_idmap *idmap, struct inode *inode, |
120 | struct iattr *iattr); |
121 | |
122 | static inline struct mem_dqinfo *sb_dqinfo(struct super_block *sb, int type) |
123 | { |
124 | return sb_dqopt(sb)->info + type; |
125 | } |
126 | |
127 | /* |
128 | * Functions for checking status of quota |
129 | */ |
130 | |
131 | static inline bool sb_has_quota_usage_enabled(struct super_block *sb, int type) |
132 | { |
133 | return sb_dqopt(sb)->flags & |
134 | dquot_state_flag(DQUOT_USAGE_ENABLED, type); |
135 | } |
136 | |
137 | static inline bool sb_has_quota_limits_enabled(struct super_block *sb, int type) |
138 | { |
139 | return sb_dqopt(sb)->flags & |
140 | dquot_state_flag(DQUOT_LIMITS_ENABLED, type); |
141 | } |
142 | |
143 | static inline bool sb_has_quota_suspended(struct super_block *sb, int type) |
144 | { |
145 | return sb_dqopt(sb)->flags & |
146 | dquot_state_flag(DQUOT_SUSPENDED, type); |
147 | } |
148 | |
149 | static inline unsigned sb_any_quota_suspended(struct super_block *sb) |
150 | { |
151 | return dquot_state_types(flags: sb_dqopt(sb)->flags, DQUOT_SUSPENDED); |
152 | } |
153 | |
154 | /* Does kernel know about any quota information for given sb + type? */ |
155 | static inline bool sb_has_quota_loaded(struct super_block *sb, int type) |
156 | { |
157 | /* Currently if anything is on, then quota usage is on as well */ |
158 | return sb_has_quota_usage_enabled(sb, type); |
159 | } |
160 | |
161 | static inline unsigned sb_any_quota_loaded(struct super_block *sb) |
162 | { |
163 | return dquot_state_types(flags: sb_dqopt(sb)->flags, DQUOT_USAGE_ENABLED); |
164 | } |
165 | |
166 | static inline bool sb_has_quota_active(struct super_block *sb, int type) |
167 | { |
168 | return sb_has_quota_loaded(sb, type) && |
169 | !sb_has_quota_suspended(sb, type); |
170 | } |
171 | |
172 | /* |
173 | * Operations supported for diskquotas. |
174 | */ |
175 | extern const struct dquot_operations dquot_operations; |
176 | extern const struct quotactl_ops dquot_quotactl_sysfile_ops; |
177 | |
178 | #else |
179 | |
180 | static inline int sb_has_quota_usage_enabled(struct super_block *sb, int type) |
181 | { |
182 | return 0; |
183 | } |
184 | |
185 | static inline int sb_has_quota_limits_enabled(struct super_block *sb, int type) |
186 | { |
187 | return 0; |
188 | } |
189 | |
190 | static inline int sb_has_quota_suspended(struct super_block *sb, int type) |
191 | { |
192 | return 0; |
193 | } |
194 | |
195 | static inline int sb_any_quota_suspended(struct super_block *sb) |
196 | { |
197 | return 0; |
198 | } |
199 | |
200 | /* Does kernel know about any quota information for given sb + type? */ |
201 | static inline int sb_has_quota_loaded(struct super_block *sb, int type) |
202 | { |
203 | return 0; |
204 | } |
205 | |
206 | static inline int sb_any_quota_loaded(struct super_block *sb) |
207 | { |
208 | return 0; |
209 | } |
210 | |
211 | static inline int sb_has_quota_active(struct super_block *sb, int type) |
212 | { |
213 | return 0; |
214 | } |
215 | |
216 | static inline int dquot_initialize(struct inode *inode) |
217 | { |
218 | return 0; |
219 | } |
220 | |
221 | static inline bool dquot_initialize_needed(struct inode *inode) |
222 | { |
223 | return false; |
224 | } |
225 | |
226 | static inline void dquot_drop(struct inode *inode) |
227 | { |
228 | } |
229 | |
230 | static inline int dquot_alloc_inode(struct inode *inode) |
231 | { |
232 | return 0; |
233 | } |
234 | |
235 | static inline void dquot_free_inode(struct inode *inode) |
236 | { |
237 | } |
238 | |
239 | static inline int dquot_transfer(struct mnt_idmap *idmap, |
240 | struct inode *inode, struct iattr *iattr) |
241 | { |
242 | return 0; |
243 | } |
244 | |
245 | static inline int __dquot_alloc_space(struct inode *inode, qsize_t number, |
246 | int flags) |
247 | { |
248 | if (!(flags & DQUOT_SPACE_RESERVE)) |
249 | inode_add_bytes(inode, number); |
250 | return 0; |
251 | } |
252 | |
253 | static inline void __dquot_free_space(struct inode *inode, qsize_t number, |
254 | int flags) |
255 | { |
256 | if (!(flags & DQUOT_SPACE_RESERVE)) |
257 | inode_sub_bytes(inode, number); |
258 | } |
259 | |
260 | static inline int dquot_claim_space_nodirty(struct inode *inode, qsize_t number) |
261 | { |
262 | inode_add_bytes(inode, number); |
263 | return 0; |
264 | } |
265 | |
266 | static inline int dquot_reclaim_space_nodirty(struct inode *inode, |
267 | qsize_t number) |
268 | { |
269 | inode_sub_bytes(inode, number); |
270 | return 0; |
271 | } |
272 | |
273 | static inline int dquot_disable(struct super_block *sb, int type, |
274 | unsigned int flags) |
275 | { |
276 | return 0; |
277 | } |
278 | |
279 | static inline int dquot_suspend(struct super_block *sb, int type) |
280 | { |
281 | return 0; |
282 | } |
283 | |
284 | static inline int dquot_resume(struct super_block *sb, int type) |
285 | { |
286 | return 0; |
287 | } |
288 | |
289 | #define dquot_file_open generic_file_open |
290 | |
291 | static inline int dquot_writeback_dquots(struct super_block *sb, int type) |
292 | { |
293 | return 0; |
294 | } |
295 | |
296 | #endif /* CONFIG_QUOTA */ |
297 | |
298 | static inline int dquot_alloc_space_nodirty(struct inode *inode, qsize_t nr) |
299 | { |
300 | return __dquot_alloc_space(inode, number: nr, DQUOT_SPACE_WARN); |
301 | } |
302 | |
303 | static inline void dquot_alloc_space_nofail(struct inode *inode, qsize_t nr) |
304 | { |
305 | __dquot_alloc_space(inode, number: nr, DQUOT_SPACE_WARN|DQUOT_SPACE_NOFAIL); |
306 | mark_inode_dirty_sync(inode); |
307 | } |
308 | |
309 | static inline int dquot_alloc_space(struct inode *inode, qsize_t nr) |
310 | { |
311 | int ret; |
312 | |
313 | ret = dquot_alloc_space_nodirty(inode, nr); |
314 | if (!ret) { |
315 | /* |
316 | * Mark inode fully dirty. Since we are allocating blocks, inode |
317 | * would become fully dirty soon anyway and it reportedly |
318 | * reduces lock contention. |
319 | */ |
320 | mark_inode_dirty(inode); |
321 | } |
322 | return ret; |
323 | } |
324 | |
325 | static inline int dquot_alloc_block_nodirty(struct inode *inode, qsize_t nr) |
326 | { |
327 | return dquot_alloc_space_nodirty(inode, nr: nr << inode->i_blkbits); |
328 | } |
329 | |
330 | static inline void dquot_alloc_block_nofail(struct inode *inode, qsize_t nr) |
331 | { |
332 | dquot_alloc_space_nofail(inode, nr: nr << inode->i_blkbits); |
333 | } |
334 | |
335 | static inline int dquot_alloc_block(struct inode *inode, qsize_t nr) |
336 | { |
337 | return dquot_alloc_space(inode, nr: nr << inode->i_blkbits); |
338 | } |
339 | |
340 | static inline int dquot_prealloc_block_nodirty(struct inode *inode, qsize_t nr) |
341 | { |
342 | return __dquot_alloc_space(inode, number: nr << inode->i_blkbits, flags: 0); |
343 | } |
344 | |
345 | static inline int dquot_prealloc_block(struct inode *inode, qsize_t nr) |
346 | { |
347 | int ret; |
348 | |
349 | ret = dquot_prealloc_block_nodirty(inode, nr); |
350 | if (!ret) |
351 | mark_inode_dirty_sync(inode); |
352 | return ret; |
353 | } |
354 | |
355 | static inline int dquot_reserve_block(struct inode *inode, qsize_t nr) |
356 | { |
357 | return __dquot_alloc_space(inode, number: nr << inode->i_blkbits, |
358 | DQUOT_SPACE_WARN|DQUOT_SPACE_RESERVE); |
359 | } |
360 | |
361 | static inline int dquot_claim_block(struct inode *inode, qsize_t nr) |
362 | { |
363 | int ret; |
364 | |
365 | ret = dquot_claim_space_nodirty(inode, number: nr << inode->i_blkbits); |
366 | if (!ret) |
367 | mark_inode_dirty_sync(inode); |
368 | return ret; |
369 | } |
370 | |
371 | static inline void dquot_reclaim_block(struct inode *inode, qsize_t nr) |
372 | { |
373 | dquot_reclaim_space_nodirty(inode, number: nr << inode->i_blkbits); |
374 | mark_inode_dirty_sync(inode); |
375 | } |
376 | |
377 | static inline void dquot_free_space_nodirty(struct inode *inode, qsize_t nr) |
378 | { |
379 | __dquot_free_space(inode, number: nr, flags: 0); |
380 | } |
381 | |
382 | static inline void dquot_free_space(struct inode *inode, qsize_t nr) |
383 | { |
384 | dquot_free_space_nodirty(inode, nr); |
385 | mark_inode_dirty_sync(inode); |
386 | } |
387 | |
388 | static inline void dquot_free_block_nodirty(struct inode *inode, qsize_t nr) |
389 | { |
390 | dquot_free_space_nodirty(inode, nr: nr << inode->i_blkbits); |
391 | } |
392 | |
393 | static inline void dquot_free_block(struct inode *inode, qsize_t nr) |
394 | { |
395 | dquot_free_space(inode, nr: nr << inode->i_blkbits); |
396 | } |
397 | |
398 | static inline void dquot_release_reservation_block(struct inode *inode, |
399 | qsize_t nr) |
400 | { |
401 | __dquot_free_space(inode, number: nr << inode->i_blkbits, DQUOT_SPACE_RESERVE); |
402 | } |
403 | |
404 | unsigned int qtype_enforce_flag(int type); |
405 | |
406 | #endif /* _LINUX_QUOTAOPS_ */ |
407 | |