xref: /linux-6.15/include/linux/quotaops.h (revision 4e8cec26) 
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 <[email protected]>
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 && ia->ia_uid != inode->i_uid) ||
26 		(ia->ia_valid & ATTR_GID && 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 void __quota_error(struct super_block *sb, const char *func,
35 			 const char *fmt, ...);
36 
37 /*
38  * declaration of quota_function calls in kernel.
39  */
40 void inode_add_rsv_space(struct inode *inode, qsize_t number);
41 void inode_claim_rsv_space(struct inode *inode, qsize_t number);
42 void inode_sub_rsv_space(struct inode *inode, qsize_t number);
43 
44 void dquot_initialize(struct inode *inode);
45 void dquot_drop(struct inode *inode);
46 struct dquot *dqget(struct super_block *sb, unsigned int id, int type);
47 void dqput(struct dquot *dquot);
48 int dquot_scan_active(struct super_block *sb,
49 		      int (*fn)(struct dquot *dquot, unsigned long priv),
50 		      unsigned long priv);
51 struct dquot *dquot_alloc(struct super_block *sb, int type);
52 void dquot_destroy(struct dquot *dquot);
53 
54 int __dquot_alloc_space(struct inode *inode, qsize_t number, int flags);
55 void __dquot_free_space(struct inode *inode, qsize_t number, int flags);
56 
57 int dquot_alloc_inode(const struct inode *inode);
58 
59 int dquot_claim_space_nodirty(struct inode *inode, qsize_t number);
60 void dquot_free_inode(const struct inode *inode);
61 
62 int dquot_disable(struct super_block *sb, int type, unsigned int flags);
63 /* Suspend quotas on remount RO */
64 static inline int dquot_suspend(struct super_block *sb, int type)
65 {
66 	return dquot_disable(sb, type, DQUOT_SUSPENDED);
67 }
68 int dquot_resume(struct super_block *sb, int type);
69 
70 int dquot_commit(struct dquot *dquot);
71 int dquot_acquire(struct dquot *dquot);
72 int dquot_release(struct dquot *dquot);
73 int dquot_commit_info(struct super_block *sb, int type);
74 int dquot_mark_dquot_dirty(struct dquot *dquot);
75 
76 int dquot_file_open(struct inode *inode, struct file *file);
77 
78 int dquot_quota_on(struct super_block *sb, int type, int format_id,
79 	char *path);
80 int dquot_enable(struct inode *inode, int type, int format_id,
81 	unsigned int flags);
82 int dquot_quota_on_path(struct super_block *sb, int type, int format_id,
83  	struct path *path);
84 int dquot_quota_on_mount(struct super_block *sb, char *qf_name,
85  	int format_id, int type);
86 int dquot_quota_off(struct super_block *sb, int type);
87 int dquot_quota_sync(struct super_block *sb, int type, int wait);
88 int dquot_get_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii);
89 int dquot_set_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii);
90 int dquot_get_dqblk(struct super_block *sb, int type, qid_t id,
91 		struct fs_disk_quota *di);
92 int dquot_set_dqblk(struct super_block *sb, int type, qid_t id,
93 		struct fs_disk_quota *di);
94 
95 int __dquot_transfer(struct inode *inode, struct dquot **transfer_to);
96 int dquot_transfer(struct inode *inode, struct iattr *iattr);
97 
98 static inline struct mem_dqinfo *sb_dqinfo(struct super_block *sb, int type)
99 {
100 	return sb_dqopt(sb)->info + type;
101 }
102 
103 /*
104  * Functions for checking status of quota
105  */
106 
107 static inline bool sb_has_quota_usage_enabled(struct super_block *sb, int type)
108 {
109 	return sb_dqopt(sb)->flags &
110 				dquot_state_flag(DQUOT_USAGE_ENABLED, type);
111 }
112 
113 static inline bool sb_has_quota_limits_enabled(struct super_block *sb, int type)
114 {
115 	return sb_dqopt(sb)->flags &
116 				dquot_state_flag(DQUOT_LIMITS_ENABLED, type);
117 }
118 
119 static inline bool sb_has_quota_suspended(struct super_block *sb, int type)
120 {
121 	return sb_dqopt(sb)->flags &
122 				dquot_state_flag(DQUOT_SUSPENDED, type);
123 }
124 
125 static inline unsigned sb_any_quota_suspended(struct super_block *sb)
126 {
127 	unsigned type, tmsk = 0;
128 	for (type = 0; type < MAXQUOTAS; type++)
129 		tmsk |= sb_has_quota_suspended(sb, type) << type;
130 	return tmsk;
131 }
132 
133 /* Does kernel know about any quota information for given sb + type? */
134 static inline bool sb_has_quota_loaded(struct super_block *sb, int type)
135 {
136 	/* Currently if anything is on, then quota usage is on as well */
137 	return sb_has_quota_usage_enabled(sb, type);
138 }
139 
140 static inline unsigned sb_any_quota_loaded(struct super_block *sb)
141 {
142 	unsigned type, tmsk = 0;
143 	for (type = 0; type < MAXQUOTAS; type++)
144 		tmsk |= sb_has_quota_loaded(sb, type) << type;
145 	return	tmsk;
146 }
147 
148 static inline bool sb_has_quota_active(struct super_block *sb, int type)
149 {
150 	return sb_has_quota_loaded(sb, type) &&
151 	       !sb_has_quota_suspended(sb, type);
152 }
153 
154 /*
155  * Operations supported for diskquotas.
156  */
157 extern const struct dquot_operations dquot_operations;
158 extern const struct quotactl_ops dquot_quotactl_ops;
159 
160 #else
161 
162 static inline int sb_has_quota_usage_enabled(struct super_block *sb, int type)
163 {
164 	return 0;
165 }
166 
167 static inline int sb_has_quota_limits_enabled(struct super_block *sb, int type)
168 {
169 	return 0;
170 }
171 
172 static inline int sb_has_quota_suspended(struct super_block *sb, int type)
173 {
174 	return 0;
175 }
176 
177 static inline int sb_any_quota_suspended(struct super_block *sb)
178 {
179 	return 0;
180 }
181 
182 /* Does kernel know about any quota information for given sb + type? */
183 static inline int sb_has_quota_loaded(struct super_block *sb, int type)
184 {
185 	return 0;
186 }
187 
188 static inline int sb_any_quota_loaded(struct super_block *sb)
189 {
190 	return 0;
191 }
192 
193 static inline int sb_has_quota_active(struct super_block *sb, int type)
194 {
195 	return 0;
196 }
197 
198 static inline void dquot_initialize(struct inode *inode)
199 {
200 }
201 
202 static inline void dquot_drop(struct inode *inode)
203 {
204 }
205 
206 static inline int dquot_alloc_inode(const struct inode *inode)
207 {
208 	return 0;
209 }
210 
211 static inline void dquot_free_inode(const struct inode *inode)
212 {
213 }
214 
215 static inline int dquot_transfer(struct inode *inode, struct iattr *iattr)
216 {
217 	return 0;
218 }
219 
220 static inline int __dquot_alloc_space(struct inode *inode, qsize_t number,
221 		int flags)
222 {
223 	if (!(flags & DQUOT_SPACE_RESERVE))
224 		inode_add_bytes(inode, number);
225 	return 0;
226 }
227 
228 static inline void __dquot_free_space(struct inode *inode, qsize_t number,
229 		int flags)
230 {
231 	if (!(flags & DQUOT_SPACE_RESERVE))
232 		inode_sub_bytes(inode, number);
233 }
234 
235 static inline int dquot_claim_space_nodirty(struct inode *inode, qsize_t number)
236 {
237 	inode_add_bytes(inode, number);
238 	return 0;
239 }
240 
241 static inline int dquot_disable(struct super_block *sb, int type,
242 		unsigned int flags)
243 {
244 	return 0;
245 }
246 
247 static inline int dquot_suspend(struct super_block *sb, int type)
248 {
249 	return 0;
250 }
251 
252 static inline int dquot_resume(struct super_block *sb, int type)
253 {
254 	return 0;
255 }
256 
257 #define dquot_file_open		generic_file_open
258 
259 #endif /* CONFIG_QUOTA */
260 
261 static inline int dquot_alloc_space_nodirty(struct inode *inode, qsize_t nr)
262 {
263 	return __dquot_alloc_space(inode, nr, DQUOT_SPACE_WARN);
264 }
265 
266 static inline void dquot_alloc_space_nofail(struct inode *inode, qsize_t nr)
267 {
268 	__dquot_alloc_space(inode, nr, DQUOT_SPACE_WARN|DQUOT_SPACE_NOFAIL);
269 	mark_inode_dirty_sync(inode);
270 }
271 
272 static inline int dquot_alloc_space(struct inode *inode, qsize_t nr)
273 {
274 	int ret;
275 
276 	ret = dquot_alloc_space_nodirty(inode, nr);
277 	if (!ret)
278 		mark_inode_dirty_sync(inode);
279 	return ret;
280 }
281 
282 static inline int dquot_alloc_block_nodirty(struct inode *inode, qsize_t nr)
283 {
284 	return dquot_alloc_space_nodirty(inode, nr << inode->i_blkbits);
285 }
286 
287 static inline void dquot_alloc_block_nofail(struct inode *inode, qsize_t nr)
288 {
289 	dquot_alloc_space_nofail(inode, nr << inode->i_blkbits);
290 }
291 
292 static inline int dquot_alloc_block(struct inode *inode, qsize_t nr)
293 {
294 	return dquot_alloc_space(inode, nr << inode->i_blkbits);
295 }
296 
297 static inline int dquot_prealloc_block_nodirty(struct inode *inode, qsize_t nr)
298 {
299 	return __dquot_alloc_space(inode, nr << inode->i_blkbits, 0);
300 }
301 
302 static inline int dquot_prealloc_block(struct inode *inode, qsize_t nr)
303 {
304 	int ret;
305 
306 	ret = dquot_prealloc_block_nodirty(inode, nr);
307 	if (!ret)
308 		mark_inode_dirty_sync(inode);
309 	return ret;
310 }
311 
312 static inline int dquot_reserve_block(struct inode *inode, qsize_t nr)
313 {
314 	return __dquot_alloc_space(inode, nr << inode->i_blkbits,
315 				DQUOT_SPACE_WARN|DQUOT_SPACE_RESERVE);
316 }
317 
318 static inline int dquot_claim_block(struct inode *inode, qsize_t nr)
319 {
320 	int ret;
321 
322 	ret = dquot_claim_space_nodirty(inode, nr << inode->i_blkbits);
323 	if (!ret)
324 		mark_inode_dirty_sync(inode);
325 	return ret;
326 }
327 
328 static inline void dquot_free_space_nodirty(struct inode *inode, qsize_t nr)
329 {
330 	__dquot_free_space(inode, nr, 0);
331 }
332 
333 static inline void dquot_free_space(struct inode *inode, qsize_t nr)
334 {
335 	dquot_free_space_nodirty(inode, nr);
336 	mark_inode_dirty_sync(inode);
337 }
338 
339 static inline void dquot_free_block_nodirty(struct inode *inode, qsize_t nr)
340 {
341 	dquot_free_space_nodirty(inode, nr << inode->i_blkbits);
342 }
343 
344 static inline void dquot_free_block(struct inode *inode, qsize_t nr)
345 {
346 	dquot_free_space(inode, nr << inode->i_blkbits);
347 }
348 
349 static inline void dquot_release_reservation_block(struct inode *inode,
350 		qsize_t nr)
351 {
352 	__dquot_free_space(inode, nr << inode->i_blkbits, DQUOT_SPACE_RESERVE);
353 }
354 
355 #endif /* _LINUX_QUOTAOPS_ */
356