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
17static inline struct quota_info *sb_dqopt(struct super_block *sb)
18{
19 return &sb->s_dquot;
20}
21
22/* i_rwsem must being held */
23static 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
36extern __printf(3, 4)
37void __quota_error(struct super_block *sb, const char *func,
38 const char *fmt, ...);
39
40/*
41 * declaration of quota_function calls in kernel.
42 */
43int dquot_initialize(struct inode *inode);
44bool dquot_initialize_needed(struct inode *inode);
45void dquot_drop(struct inode *inode);
46struct dquot *dqget(struct super_block *sb, struct kqid qid);
47static 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
56static 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
65void dqput(struct dquot *dquot);
66int dquot_scan_active(struct super_block *sb,
67 int (*fn)(struct dquot *dquot, unsigned long priv),
68 unsigned long priv);
69struct dquot *dquot_alloc(struct super_block *sb, int type);
70void dquot_destroy(struct dquot *dquot);
71
72int __dquot_alloc_space(struct inode *inode, qsize_t number, int flags);
73void __dquot_free_space(struct inode *inode, qsize_t number, int flags);
74
75int dquot_alloc_inode(struct inode *inode);
76
77void dquot_claim_space_nodirty(struct inode *inode, qsize_t number);
78void dquot_free_inode(struct inode *inode);
79void dquot_reclaim_space_nodirty(struct inode *inode, qsize_t number);
80
81int dquot_disable(struct super_block *sb, int type, unsigned int flags);
82/* Suspend quotas on remount RO */
83static inline int dquot_suspend(struct super_block *sb, int type)
84{
85 return dquot_disable(sb, type, DQUOT_SUSPENDED);
86}
87int dquot_resume(struct super_block *sb, int type);
88
89int dquot_commit(struct dquot *dquot);
90int dquot_acquire(struct dquot *dquot);
91int dquot_release(struct dquot *dquot);
92int dquot_commit_info(struct super_block *sb, int type);
93int dquot_get_next_id(struct super_block *sb, struct kqid *qid);
94int dquot_mark_dquot_dirty(struct dquot *dquot);
95
96int dquot_file_open(struct inode *inode, struct file *file);
97
98int dquot_load_quota_sb(struct super_block *sb, int type, int format_id,
99 unsigned int flags);
100int dquot_load_quota_inode(struct inode *inode, int type, int format_id,
101 unsigned int flags);
102int dquot_quota_on(struct super_block *sb, int type, int format_id,
103 const struct path *path);
104int dquot_quota_on_mount(struct super_block *sb, char *qf_name,
105 int format_id, int type);
106int dquot_quota_off(struct super_block *sb, int type);
107int dquot_writeback_dquots(struct super_block *sb, int type);
108int dquot_quota_sync(struct super_block *sb, int type);
109int dquot_get_state(struct super_block *sb, struct qc_state *state);
110int dquot_set_dqinfo(struct super_block *sb, int type, struct qc_info *ii);
111int dquot_get_dqblk(struct super_block *sb, struct kqid id,
112 struct qc_dqblk *di);
113int dquot_get_next_dqblk(struct super_block *sb, struct kqid *id,
114 struct qc_dqblk *di);
115int dquot_set_dqblk(struct super_block *sb, struct kqid id,
116 struct qc_dqblk *di);
117
118int __dquot_transfer(struct inode *inode, struct dquot **transfer_to);
119int dquot_transfer(struct mnt_idmap *idmap, struct inode *inode,
120 struct iattr *iattr);
121
122static 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
131static 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
137static 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
143static 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
149static 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? */
155static 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
161static 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
166static 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 */
175extern const struct dquot_operations dquot_operations;
176extern const struct quotactl_ops dquot_quotactl_sysfile_ops;
177
178#else
179
180static inline int sb_has_quota_usage_enabled(struct super_block *sb, int type)
181{
182 return 0;
183}
184
185static inline int sb_has_quota_limits_enabled(struct super_block *sb, int type)
186{
187 return 0;
188}
189
190static inline int sb_has_quota_suspended(struct super_block *sb, int type)
191{
192 return 0;
193}
194
195static 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? */
201static inline int sb_has_quota_loaded(struct super_block *sb, int type)
202{
203 return 0;
204}
205
206static inline int sb_any_quota_loaded(struct super_block *sb)
207{
208 return 0;
209}
210
211static inline int sb_has_quota_active(struct super_block *sb, int type)
212{
213 return 0;
214}
215
216static inline int dquot_initialize(struct inode *inode)
217{
218 return 0;
219}
220
221static inline bool dquot_initialize_needed(struct inode *inode)
222{
223 return false;
224}
225
226static inline void dquot_drop(struct inode *inode)
227{
228}
229
230static inline int dquot_alloc_inode(struct inode *inode)
231{
232 return 0;
233}
234
235static inline void dquot_free_inode(struct inode *inode)
236{
237}
238
239static inline int dquot_transfer(struct mnt_idmap *idmap,
240 struct inode *inode, struct iattr *iattr)
241{
242 return 0;
243}
244
245static 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
253static 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
260static inline void dquot_claim_space_nodirty(struct inode *inode, qsize_t number)
261{
262 inode_add_bytes(inode, number);
263}
264
265static inline int dquot_reclaim_space_nodirty(struct inode *inode,
266 qsize_t number)
267{
268 inode_sub_bytes(inode, number);
269 return 0;
270}
271
272static inline int dquot_disable(struct super_block *sb, int type,
273 unsigned int flags)
274{
275 return 0;
276}
277
278static inline int dquot_suspend(struct super_block *sb, int type)
279{
280 return 0;
281}
282
283static inline int dquot_resume(struct super_block *sb, int type)
284{
285 return 0;
286}
287
288#define dquot_file_open generic_file_open
289
290static inline int dquot_writeback_dquots(struct super_block *sb, int type)
291{
292 return 0;
293}
294
295#endif /* CONFIG_QUOTA */
296
297static inline int dquot_alloc_space_nodirty(struct inode *inode, qsize_t nr)
298{
299 return __dquot_alloc_space(inode, number: nr, DQUOT_SPACE_WARN);
300}
301
302static inline void dquot_alloc_space_nofail(struct inode *inode, qsize_t nr)
303{
304 __dquot_alloc_space(inode, number: nr, DQUOT_SPACE_WARN|DQUOT_SPACE_NOFAIL);
305 mark_inode_dirty_sync(inode);
306}
307
308static inline int dquot_alloc_space(struct inode *inode, qsize_t nr)
309{
310 int ret;
311
312 ret = dquot_alloc_space_nodirty(inode, nr);
313 if (!ret) {
314 /*
315 * Mark inode fully dirty. Since we are allocating blocks, inode
316 * would become fully dirty soon anyway and it reportedly
317 * reduces lock contention.
318 */
319 mark_inode_dirty(inode);
320 }
321 return ret;
322}
323
324static inline int dquot_alloc_block_nodirty(struct inode *inode, qsize_t nr)
325{
326 return dquot_alloc_space_nodirty(inode, nr: nr << inode->i_blkbits);
327}
328
329static inline void dquot_alloc_block_nofail(struct inode *inode, qsize_t nr)
330{
331 dquot_alloc_space_nofail(inode, nr: nr << inode->i_blkbits);
332}
333
334static inline int dquot_alloc_block(struct inode *inode, qsize_t nr)
335{
336 return dquot_alloc_space(inode, nr: nr << inode->i_blkbits);
337}
338
339static inline int dquot_prealloc_block_nodirty(struct inode *inode, qsize_t nr)
340{
341 return __dquot_alloc_space(inode, number: nr << inode->i_blkbits, flags: 0);
342}
343
344static inline int dquot_prealloc_block(struct inode *inode, qsize_t nr)
345{
346 int ret;
347
348 ret = dquot_prealloc_block_nodirty(inode, nr);
349 if (!ret)
350 mark_inode_dirty_sync(inode);
351 return ret;
352}
353
354static inline int dquot_reserve_block(struct inode *inode, qsize_t nr)
355{
356 return __dquot_alloc_space(inode, number: nr << inode->i_blkbits,
357 DQUOT_SPACE_WARN|DQUOT_SPACE_RESERVE);
358}
359
360static inline void dquot_claim_block(struct inode *inode, qsize_t nr)
361{
362 dquot_claim_space_nodirty(inode, number: nr << inode->i_blkbits);
363 mark_inode_dirty_sync(inode);
364}
365
366static inline void dquot_reclaim_block(struct inode *inode, qsize_t nr)
367{
368 dquot_reclaim_space_nodirty(inode, number: nr << inode->i_blkbits);
369 mark_inode_dirty_sync(inode);
370}
371
372static inline void dquot_free_space_nodirty(struct inode *inode, qsize_t nr)
373{
374 __dquot_free_space(inode, number: nr, flags: 0);
375}
376
377static inline void dquot_free_space(struct inode *inode, qsize_t nr)
378{
379 dquot_free_space_nodirty(inode, nr);
380 mark_inode_dirty_sync(inode);
381}
382
383static inline void dquot_free_block_nodirty(struct inode *inode, qsize_t nr)
384{
385 dquot_free_space_nodirty(inode, nr: nr << inode->i_blkbits);
386}
387
388static inline void dquot_free_block(struct inode *inode, qsize_t nr)
389{
390 dquot_free_space(inode, nr: nr << inode->i_blkbits);
391}
392
393static inline void dquot_release_reservation_block(struct inode *inode,
394 qsize_t nr)
395{
396 __dquot_free_space(inode, number: nr << inode->i_blkbits, DQUOT_SPACE_RESERVE);
397}
398
399unsigned int qtype_enforce_flag(int type);
400
401#endif /* _LINUX_QUOTAOPS_ */
402