summaryrefslogtreecommitdiffstats
path: root/include/linux/quotaops.h
blob: a5ebd1abccd8d9b068682fd25fe0419e5cf05e19 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
/*
 * Definitions for diskquota-operations. When diskquota is configured these
 * macros expand to the right source-code.
 *
 * Author:  Marco van Wieringen <mvw@planets.elm.net>
 */
#ifndef _LINUX_QUOTAOPS_
#define _LINUX_QUOTAOPS_

#include <linux/fs.h>

static inline struct quota_info *sb_dqopt(struct super_block *sb)
{
	return &sb->s_dquot;
}

#if defined(CONFIG_QUOTA)

/*
 * declaration of quota_function calls in kernel.
 */
void inode_add_rsv_space(struct inode *inode, qsize_t number);
void inode_claim_rsv_space(struct inode *inode, qsize_t number);
void inode_sub_rsv_space(struct inode *inode, qsize_t number);

int dquot_initialize(struct inode *inode, int type);
void dquot_drop(struct inode *inode);
struct dquot *dqget(struct super_block *sb, unsigned int id, int type);
void dqput(struct dquot *dquot);
int dquot_scan_active(struct super_block *sb,
		      int (*fn)(struct dquot *dquot, unsigned long priv),
		      unsigned long priv);
struct dquot *dquot_alloc(struct super_block *sb, int type);
void dquot_destroy(struct dquot *dquot);

int __dquot_alloc_space(struct inode *inode, qsize_t number,
		int warn, int reserve);
void __dquot_free_space(struct inode *inode, qsize_t number, int reserve);

int dquot_alloc_inode(const struct inode *inode);

int dquot_claim_space_nodirty(struct inode *inode, qsize_t number);
void dquot_free_inode(const struct inode *inode);

int dquot_commit(struct dquot *dquot);
int dquot_acquire(struct dquot *dquot);
int dquot_release(struct dquot *dquot);
int dquot_commit_info(struct super_block *sb, int type);
int dquot_mark_dquot_dirty(struct dquot *dquot);

int vfs_quota_on(struct super_block *sb, int type, int format_id,
 	char *path, int remount);
int vfs_quota_enable(struct inode *inode, int type, int format_id,
	unsigned int flags);
int vfs_quota_on_path(struct super_block *sb, int type, int format_id,
 	struct path *path);
int vfs_quota_on_mount(struct super_block *sb, char *qf_name,
 	int format_id, int type);
int vfs_quota_off(struct super_block *sb, int type, int remount);
int vfs_quota_disable(struct super_block *sb, int type, unsigned int flags);
int vfs_quota_sync(struct super_block *sb, int type, int wait);
int vfs_get_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii);
int vfs_set_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii);
int vfs_get_dqblk(struct super_block *sb, int type, qid_t id, struct if_dqblk *di);
int vfs_set_dqblk(struct super_block *sb, int type, qid_t id, struct if_dqblk *di);

int dquot_transfer(struct inode *inode, struct iattr *iattr);
int vfs_dq_quota_on_remount(struct super_block *sb);

static inline struct mem_dqinfo *sb_dqinfo(struct super_block *sb, int type)
{
	return sb_dqopt(sb)->info + type;
}

/*
 * Functions for checking status of quota
 */

static inline bool sb_has_quota_usage_enabled(struct super_block *sb, int type)
{
	return sb_dqopt(sb)->flags &
				dquot_state_flag(DQUOT_USAGE_ENABLED, type);
}

static inline bool sb_has_quota_limits_enabled(struct super_block *sb, int type)
{
	return sb_dqopt(sb)->flags &
				dquot_state_flag(DQUOT_LIMITS_ENABLED, type);
}

static inline bool sb_has_quota_suspended(struct super_block *sb, int type)
{
	return sb_dqopt(sb)->flags &
				dquot_state_flag(DQUOT_SUSPENDED, type);
}

static inline unsigned sb_any_quota_suspended(struct super_block *sb)
{
	unsigned type, tmsk = 0;
	for (type = 0; type < MAXQUOTAS; type++)
		tmsk |= sb_has_quota_suspended(sb, type) << type;
	return tmsk;
}

/* Does kernel know about any quota information for given sb + type? */
static inline bool sb_has_quota_loaded(struct super_block *sb, int type)
{
	/* Currently if anything is on, then quota usage is on as well */
	return sb_has_quota_usage_enabled(sb, type);
}

static inline unsigned sb_any_quota_loaded(struct super_block *sb)
{
	unsigned type, tmsk = 0;
	for (type = 0; type < MAXQUOTAS; type++)
		tmsk |= sb_has_quota_loaded(sb, type) << type;
	return	tmsk;
}

static inline bool sb_has_quota_active(struct super_block *sb, int type)
{
	return sb_has_quota_loaded(sb, type) &&
	       !sb_has_quota_suspended(sb, type);
}

static inline unsigned sb_any_quota_active(struct super_block *sb)
{
	return sb_any_quota_loaded(sb) & ~sb_any_quota_suspended(sb);
}

/*
 * Operations supported for diskquotas.
 */
extern const struct dquot_operations dquot_operations;
extern const struct quotactl_ops vfs_quotactl_ops;

#define sb_dquot_ops (&dquot_operations)
#define sb_quotactl_ops (&vfs_quotactl_ops)

/* It is better to call this function outside of any transaction as it might
 * need a lot of space in journal for dquot structure allocation. */
static inline void vfs_dq_init(struct inode *inode)
{
	BUG_ON(!inode->i_sb);
	if (sb_any_quota_active(inode->i_sb) && !IS_NOQUOTA(inode))
		inode->i_sb->dq_op->initialize(inode, -1);
}

/* Cannot be called inside a transaction */
static inline int vfs_dq_off(struct super_block *sb, int remount)
{
	int ret = -ENOSYS;

	if (sb->s_qcop && sb->s_qcop->quota_off)
		ret = sb->s_qcop->quota_off(sb, -1, remount);
	return ret;
}

#else

static inline int sb_has_quota_usage_enabled(struct super_block *sb, int type)
{
	return 0;
}

static inline int sb_has_quota_limits_enabled(struct super_block *sb, int type)
{
	return 0;
}

static inline int sb_has_quota_suspended(struct super_block *sb, int type)
{
	return 0;
}

static inline int sb_any_quota_suspended(struct super_block *sb)
{
	return 0;
}

/* Does kernel know about any quota information for given sb + type? */
static inline int sb_has_quota_loaded(struct super_block *sb, int type)
{
	return 0;
}

static inline int sb_any_quota_loaded(struct super_block *sb)
{
	return 0;
}

static inline int sb_has_quota_active(struct super_block *sb, int type)
{
	return 0;
}

static inline int sb_any_quota_active(struct super_block *sb)
{
	return 0;
}

/*
 * NO-OP when quota not configured.
 */
#define sb_dquot_ops				(NULL)
#define sb_quotactl_ops				(NULL)

static inline void vfs_dq_init(struct inode *inode)
{
}

static inline void dquot_drop(struct inode *inode)
{
}

static inline int dquot_alloc_inode(const struct inode *inode)
{
	return 0;
}

static inline void dquot_free_inode(const struct inode *inode)
{
}

static inline int vfs_dq_off(struct super_block *sb, int remount)
{
	return 0;
}

static inline int vfs_dq_quota_on_remount(struct super_block *sb)
{
	return 0;
}

static inline int dquot_transfer(struct inode *inode, struct iattr *iattr)
{
	return 0;
}

static inline int __dquot_alloc_space(struct inode *inode, qsize_t number,
		int warn, int reserve)
{
	if (!reserve)
		inode_add_bytes(inode, number);
	return 0;
}

static inline void __dquot_free_space(struct inode *inode, qsize_t number,
		int reserve)
{
	if (!reserve)
		inode_sub_bytes(inode, number);
}

static inline int dquot_claim_space_nodirty(struct inode *inode, qsize_t number)
{
	inode_add_bytes(inode, number);
	return 0;
}

#endif /* CONFIG_QUOTA */

static inline int dquot_alloc_space_nodirty(struct inode *inode, qsize_t nr)
{
	return __dquot_alloc_space(inode, nr, 1, 0);
}

static inline int dquot_alloc_space(struct inode *inode, qsize_t nr)
{
	int ret;

	ret = dquot_alloc_space_nodirty(inode, nr);
	if (!ret)
		mark_inode_dirty(inode);
	return ret;
}

static inline int dquot_alloc_block_nodirty(struct inode *inode, qsize_t nr)
{
	return dquot_alloc_space_nodirty(inode, nr << inode->i_blkbits);
}

static inline int dquot_alloc_block(struct inode *inode, qsize_t nr)
{
	return dquot_alloc_space(inode, nr << inode->i_blkbits);
}

static inline int dquot_prealloc_block_nodirty(struct inode *inode, qsize_t nr)
{
	return __dquot_alloc_space(inode, nr << inode->i_blkbits, 0, 0);
}

static inline int dquot_prealloc_block(struct inode *inode, qsize_t nr)
{
	int ret;

	ret = dquot_prealloc_block_nodirty(inode, nr);
	if (!ret)
		mark_inode_dirty(inode);
	return ret;
}

static inline int dquot_reserve_block(struct inode *inode, qsize_t nr)
{
	return __dquot_alloc_space(inode, nr << inode->i_blkbits, 1, 1);
}

static inline int dquot_claim_block(struct inode *inode, qsize_t nr)
{
	int ret;

	ret = dquot_claim_space_nodirty(inode, nr << inode->i_blkbits);
	if (!ret)
		mark_inode_dirty(inode);
	return ret;
}

static inline void dquot_free_space_nodirty(struct inode *inode, qsize_t nr)
{
	__dquot_free_space(inode, nr, 0);
}

static inline void dquot_free_space(struct inode *inode, qsize_t nr)
{
	dquot_free_space_nodirty(inode, nr);
	mark_inode_dirty(inode);
}

static inline void dquot_free_block_nodirty(struct inode *inode, qsize_t nr)
{
	dquot_free_space_nodirty(inode, nr << inode->i_blkbits);
}

static inline void dquot_free_block(struct inode *inode, qsize_t nr)
{
	dquot_free_space(inode, nr << inode->i_blkbits);
}

static inline void dquot_release_reservation_block(struct inode *inode,
		qsize_t nr)
{
	__dquot_free_space(inode, nr << inode->i_blkbits, 1);
}

#endif /* _LINUX_QUOTAOPS_ */
OpenPOWER on IntegriCloud