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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 | static inline struct quota_info *sb_dqopt(struct super_block *sb) |
13 | { |
14 | return &sb->s_dquot; |
15 | } |
16 | |
17 | #if defined(CONFIG_QUOTA) |
18 | |
19 | /* |
20 | * declaration of quota_function calls in kernel. |
21 | */ |
22 | void inode_add_rsv_space(struct inode *inode, qsize_t number); |
23 | void inode_claim_rsv_space(struct inode *inode, qsize_t number); |
24 | void inode_sub_rsv_space(struct inode *inode, qsize_t number); |
25 | |
26 | void dquot_initialize(struct inode *inode); |
27 | void dquot_drop(struct inode *inode); |
28 | struct dquot *dqget(struct super_block *sb, unsigned int id, int type); |
29 | void dqput(struct dquot *dquot); |
30 | int dquot_scan_active(struct super_block *sb, |
31 | int (*fn)(struct dquot *dquot, unsigned long priv), |
32 | unsigned long priv); |
33 | struct dquot *dquot_alloc(struct super_block *sb, int type); |
34 | void dquot_destroy(struct dquot *dquot); |
35 | |
36 | int __dquot_alloc_space(struct inode *inode, qsize_t number, |
37 | int warn, int reserve); |
38 | void __dquot_free_space(struct inode *inode, qsize_t number, int reserve); |
39 | |
40 | int dquot_alloc_inode(const struct inode *inode); |
41 | |
42 | int dquot_claim_space_nodirty(struct inode *inode, qsize_t number); |
43 | void dquot_free_inode(const struct inode *inode); |
44 | |
45 | int dquot_commit(struct dquot *dquot); |
46 | int dquot_acquire(struct dquot *dquot); |
47 | int dquot_release(struct dquot *dquot); |
48 | int dquot_commit_info(struct super_block *sb, int type); |
49 | int dquot_mark_dquot_dirty(struct dquot *dquot); |
50 | |
51 | int dquot_file_open(struct inode *inode, struct file *file); |
52 | |
53 | int vfs_quota_on(struct super_block *sb, int type, int format_id, |
54 | char *path, int remount); |
55 | int vfs_quota_enable(struct inode *inode, int type, int format_id, |
56 | unsigned int flags); |
57 | int vfs_quota_on_path(struct super_block *sb, int type, int format_id, |
58 | struct path *path); |
59 | int vfs_quota_on_mount(struct super_block *sb, char *qf_name, |
60 | int format_id, int type); |
61 | int vfs_quota_off(struct super_block *sb, int type, int remount); |
62 | int vfs_quota_disable(struct super_block *sb, int type, unsigned int flags); |
63 | int vfs_quota_sync(struct super_block *sb, int type, int wait); |
64 | int vfs_get_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii); |
65 | int vfs_set_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii); |
66 | int vfs_get_dqblk(struct super_block *sb, int type, qid_t id, struct if_dqblk *di); |
67 | int vfs_set_dqblk(struct super_block *sb, int type, qid_t id, struct if_dqblk *di); |
68 | |
69 | int dquot_transfer(struct inode *inode, struct iattr *iattr); |
70 | int vfs_dq_quota_on_remount(struct super_block *sb); |
71 | |
72 | static inline struct mem_dqinfo *sb_dqinfo(struct super_block *sb, int type) |
73 | { |
74 | return sb_dqopt(sb)->info + type; |
75 | } |
76 | |
77 | /* |
78 | * Functions for checking status of quota |
79 | */ |
80 | |
81 | static inline bool sb_has_quota_usage_enabled(struct super_block *sb, int type) |
82 | { |
83 | return sb_dqopt(sb)->flags & |
84 | dquot_state_flag(DQUOT_USAGE_ENABLED, type); |
85 | } |
86 | |
87 | static inline bool sb_has_quota_limits_enabled(struct super_block *sb, int type) |
88 | { |
89 | return sb_dqopt(sb)->flags & |
90 | dquot_state_flag(DQUOT_LIMITS_ENABLED, type); |
91 | } |
92 | |
93 | static inline bool sb_has_quota_suspended(struct super_block *sb, int type) |
94 | { |
95 | return sb_dqopt(sb)->flags & |
96 | dquot_state_flag(DQUOT_SUSPENDED, type); |
97 | } |
98 | |
99 | static inline unsigned sb_any_quota_suspended(struct super_block *sb) |
100 | { |
101 | unsigned type, tmsk = 0; |
102 | for (type = 0; type < MAXQUOTAS; type++) |
103 | tmsk |= sb_has_quota_suspended(sb, type) << type; |
104 | return tmsk; |
105 | } |
106 | |
107 | /* Does kernel know about any quota information for given sb + type? */ |
108 | static inline bool sb_has_quota_loaded(struct super_block *sb, int type) |
109 | { |
110 | /* Currently if anything is on, then quota usage is on as well */ |
111 | return sb_has_quota_usage_enabled(sb, type); |
112 | } |
113 | |
114 | static inline unsigned sb_any_quota_loaded(struct super_block *sb) |
115 | { |
116 | unsigned type, tmsk = 0; |
117 | for (type = 0; type < MAXQUOTAS; type++) |
118 | tmsk |= sb_has_quota_loaded(sb, type) << type; |
119 | return tmsk; |
120 | } |
121 | |
122 | static inline bool sb_has_quota_active(struct super_block *sb, int type) |
123 | { |
124 | return sb_has_quota_loaded(sb, type) && |
125 | !sb_has_quota_suspended(sb, type); |
126 | } |
127 | |
128 | static inline unsigned sb_any_quota_active(struct super_block *sb) |
129 | { |
130 | return sb_any_quota_loaded(sb) & ~sb_any_quota_suspended(sb); |
131 | } |
132 | |
133 | /* |
134 | * Operations supported for diskquotas. |
135 | */ |
136 | extern const struct dquot_operations dquot_operations; |
137 | extern const struct quotactl_ops vfs_quotactl_ops; |
138 | |
139 | #define sb_dquot_ops (&dquot_operations) |
140 | #define sb_quotactl_ops (&vfs_quotactl_ops) |
141 | |
142 | /* Cannot be called inside a transaction */ |
143 | static inline int vfs_dq_off(struct super_block *sb, int remount) |
144 | { |
145 | int ret = -ENOSYS; |
146 | |
147 | if (sb->s_qcop && sb->s_qcop->quota_off) |
148 | ret = sb->s_qcop->quota_off(sb, -1, remount); |
149 | return ret; |
150 | } |
151 | |
152 | #else |
153 | |
154 | static inline int sb_has_quota_usage_enabled(struct super_block *sb, int type) |
155 | { |
156 | return 0; |
157 | } |
158 | |
159 | static inline int sb_has_quota_limits_enabled(struct super_block *sb, int type) |
160 | { |
161 | return 0; |
162 | } |
163 | |
164 | static inline int sb_has_quota_suspended(struct super_block *sb, int type) |
165 | { |
166 | return 0; |
167 | } |
168 | |
169 | static inline int sb_any_quota_suspended(struct super_block *sb) |
170 | { |
171 | return 0; |
172 | } |
173 | |
174 | /* Does kernel know about any quota information for given sb + type? */ |
175 | static inline int sb_has_quota_loaded(struct super_block *sb, int type) |
176 | { |
177 | return 0; |
178 | } |
179 | |
180 | static inline int sb_any_quota_loaded(struct super_block *sb) |
181 | { |
182 | return 0; |
183 | } |
184 | |
185 | static inline int sb_has_quota_active(struct super_block *sb, int type) |
186 | { |
187 | return 0; |
188 | } |
189 | |
190 | static inline int sb_any_quota_active(struct super_block *sb) |
191 | { |
192 | return 0; |
193 | } |
194 | |
195 | /* |
196 | * NO-OP when quota not configured. |
197 | */ |
198 | #define sb_dquot_ops (NULL) |
199 | #define sb_quotactl_ops (NULL) |
200 | |
201 | static inline void dquot_initialize(struct inode *inode) |
202 | { |
203 | } |
204 | |
205 | static inline void dquot_drop(struct inode *inode) |
206 | { |
207 | } |
208 | |
209 | static inline int dquot_alloc_inode(const struct inode *inode) |
210 | { |
211 | return 0; |
212 | } |
213 | |
214 | static inline void dquot_free_inode(const struct inode *inode) |
215 | { |
216 | } |
217 | |
218 | static inline int vfs_dq_off(struct super_block *sb, int remount) |
219 | { |
220 | return 0; |
221 | } |
222 | |
223 | static inline int vfs_dq_quota_on_remount(struct super_block *sb) |
224 | { |
225 | return 0; |
226 | } |
227 | |
228 | static inline int dquot_transfer(struct inode *inode, struct iattr *iattr) |
229 | { |
230 | return 0; |
231 | } |
232 | |
233 | static inline int __dquot_alloc_space(struct inode *inode, qsize_t number, |
234 | int warn, int reserve) |
235 | { |
236 | if (!reserve) |
237 | inode_add_bytes(inode, number); |
238 | return 0; |
239 | } |
240 | |
241 | static inline void __dquot_free_space(struct inode *inode, qsize_t number, |
242 | int reserve) |
243 | { |
244 | if (!reserve) |
245 | inode_sub_bytes(inode, number); |
246 | } |
247 | |
248 | static inline int dquot_claim_space_nodirty(struct inode *inode, qsize_t number) |
249 | { |
250 | inode_add_bytes(inode, number); |
251 | return 0; |
252 | } |
253 | |
254 | #define dquot_file_open generic_file_open |
255 | |
256 | #endif /* CONFIG_QUOTA */ |
257 | |
258 | static inline int dquot_alloc_space_nodirty(struct inode *inode, qsize_t nr) |
259 | { |
260 | return __dquot_alloc_space(inode, nr, 1, 0); |
261 | } |
262 | |
263 | static inline int dquot_alloc_space(struct inode *inode, qsize_t nr) |
264 | { |
265 | int ret; |
266 | |
267 | ret = dquot_alloc_space_nodirty(inode, nr); |
268 | if (!ret) |
269 | mark_inode_dirty(inode); |
270 | return ret; |
271 | } |
272 | |
273 | static inline int dquot_alloc_block_nodirty(struct inode *inode, qsize_t nr) |
274 | { |
275 | return dquot_alloc_space_nodirty(inode, nr << inode->i_blkbits); |
276 | } |
277 | |
278 | static inline int dquot_alloc_block(struct inode *inode, qsize_t nr) |
279 | { |
280 | return dquot_alloc_space(inode, nr << inode->i_blkbits); |
281 | } |
282 | |
283 | static inline int dquot_prealloc_block_nodirty(struct inode *inode, qsize_t nr) |
284 | { |
285 | return __dquot_alloc_space(inode, nr << inode->i_blkbits, 0, 0); |
286 | } |
287 | |
288 | static inline int dquot_prealloc_block(struct inode *inode, qsize_t nr) |
289 | { |
290 | int ret; |
291 | |
292 | ret = dquot_prealloc_block_nodirty(inode, nr); |
293 | if (!ret) |
294 | mark_inode_dirty(inode); |
295 | return ret; |
296 | } |
297 | |
298 | static inline int dquot_reserve_block(struct inode *inode, qsize_t nr) |
299 | { |
300 | return __dquot_alloc_space(inode, nr << inode->i_blkbits, 1, 1); |
301 | } |
302 | |
303 | static inline int dquot_claim_block(struct inode *inode, qsize_t nr) |
304 | { |
305 | int ret; |
306 | |
307 | ret = dquot_claim_space_nodirty(inode, nr << inode->i_blkbits); |
308 | if (!ret) |
309 | mark_inode_dirty(inode); |
310 | return ret; |
311 | } |
312 | |
313 | static inline void dquot_free_space_nodirty(struct inode *inode, qsize_t nr) |
314 | { |
315 | __dquot_free_space(inode, nr, 0); |
316 | } |
317 | |
318 | static inline void dquot_free_space(struct inode *inode, qsize_t nr) |
319 | { |
320 | dquot_free_space_nodirty(inode, nr); |
321 | mark_inode_dirty(inode); |
322 | } |
323 | |
324 | static inline void dquot_free_block_nodirty(struct inode *inode, qsize_t nr) |
325 | { |
326 | dquot_free_space_nodirty(inode, nr << inode->i_blkbits); |
327 | } |
328 | |
329 | static inline void dquot_free_block(struct inode *inode, qsize_t nr) |
330 | { |
331 | dquot_free_space(inode, nr << inode->i_blkbits); |
332 | } |
333 | |
334 | static inline void dquot_release_reservation_block(struct inode *inode, |
335 | qsize_t nr) |
336 | { |
337 | __dquot_free_space(inode, nr << inode->i_blkbits, 1); |
338 | } |
339 | |
340 | #endif /* _LINUX_QUOTAOPS_ */ |
341 |
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