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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 * Version: $Id: quotaops.h,v 1.2 1998/01/15 16:22:26 ecd Exp $
8 *
9 */
10#ifndef _LINUX_QUOTAOPS_
11#define _LINUX_QUOTAOPS_
12
13#include <linux/smp_lock.h>
14#include <linux/fs.h>
15
16static inline struct quota_info *sb_dqopt(struct super_block *sb)
17{
18 return &sb->s_dquot;
19}
20
21#if defined(CONFIG_QUOTA)
22
23/*
24 * declaration of quota_function calls in kernel.
25 */
26void sync_dquots(struct super_block *sb, int type);
27
28int dquot_initialize(struct inode *inode, int type);
29int dquot_drop(struct inode *inode);
30
31int dquot_alloc_space(struct inode *inode, qsize_t number, int prealloc);
32int dquot_alloc_inode(const struct inode *inode, unsigned long number);
33
34int dquot_free_space(struct inode *inode, qsize_t number);
35int dquot_free_inode(const struct inode *inode, unsigned long number);
36
37int dquot_transfer(struct inode *inode, struct iattr *iattr);
38int dquot_commit(struct dquot *dquot);
39int dquot_acquire(struct dquot *dquot);
40int dquot_release(struct dquot *dquot);
41int dquot_commit_info(struct super_block *sb, int type);
42int dquot_mark_dquot_dirty(struct dquot *dquot);
43
44int vfs_quota_on(struct super_block *sb, int type, int format_id,
45 char *path, int remount);
46int vfs_quota_on_mount(struct super_block *sb, char *qf_name,
47 int format_id, int type);
48int vfs_quota_off(struct super_block *sb, int type, int remount);
49int vfs_quota_sync(struct super_block *sb, int type);
50int vfs_get_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii);
51int vfs_set_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii);
52int vfs_get_dqblk(struct super_block *sb, int type, qid_t id, struct if_dqblk *di);
53int vfs_set_dqblk(struct super_block *sb, int type, qid_t id, struct if_dqblk *di);
54
55void vfs_dq_drop(struct inode *inode);
56int vfs_dq_transfer(struct inode *inode, struct iattr *iattr);
57int vfs_dq_quota_on_remount(struct super_block *sb);
58
59static inline struct mem_dqinfo *sb_dqinfo(struct super_block *sb, int type)
60{
61 return sb_dqopt(sb)->info + type;
62}
63
64/*
65 * Functions for checking status of quota
66 */
67
68static inline int sb_has_quota_enabled(struct super_block *sb, int type)
69{
70 if (type == USRQUOTA)
71 return sb_dqopt(sb)->flags & DQUOT_USR_ENABLED;
72 return sb_dqopt(sb)->flags & DQUOT_GRP_ENABLED;
73}
74
75static inline int sb_any_quota_enabled(struct super_block *sb)
76{
77 return sb_has_quota_enabled(sb, USRQUOTA) ||
78 sb_has_quota_enabled(sb, GRPQUOTA);
79}
80
81static inline int sb_has_quota_suspended(struct super_block *sb, int type)
82{
83 if (type == USRQUOTA)
84 return sb_dqopt(sb)->flags & DQUOT_USR_SUSPENDED;
85 return sb_dqopt(sb)->flags & DQUOT_GRP_SUSPENDED;
86}
87
88static inline int sb_any_quota_suspended(struct super_block *sb)
89{
90 return sb_has_quota_suspended(sb, USRQUOTA) ||
91 sb_has_quota_suspended(sb, GRPQUOTA);
92}
93
94/*
95 * Operations supported for diskquotas.
96 */
97extern struct dquot_operations dquot_operations;
98extern struct quotactl_ops vfs_quotactl_ops;
99
100#define sb_dquot_ops (&dquot_operations)
101#define sb_quotactl_ops (&vfs_quotactl_ops)
102
103/* It is better to call this function outside of any transaction as it might
104 * need a lot of space in journal for dquot structure allocation. */
105static inline void vfs_dq_init(struct inode *inode)
106{
107 BUG_ON(!inode->i_sb);
108 if (sb_any_quota_enabled(inode->i_sb) && !IS_NOQUOTA(inode))
109 inode->i_sb->dq_op->initialize(inode, -1);
110}
111
112/* The following allocation/freeing/transfer functions *must* be called inside
113 * a transaction (deadlocks possible otherwise) */
114static inline int vfs_dq_prealloc_space_nodirty(struct inode *inode, qsize_t nr)
115{
116 if (sb_any_quota_enabled(inode->i_sb)) {
117 /* Used space is updated in alloc_space() */
118 if (inode->i_sb->dq_op->alloc_space(inode, nr, 1) == NO_QUOTA)
119 return 1;
120 }
121 else
122 inode_add_bytes(inode, nr);
123 return 0;
124}
125
126static inline int vfs_dq_prealloc_space(struct inode *inode, qsize_t nr)
127{
128 int ret;
129 if (!(ret = vfs_dq_prealloc_space_nodirty(inode, nr)))
130 mark_inode_dirty(inode);
131 return ret;
132}
133
134static inline int vfs_dq_alloc_space_nodirty(struct inode *inode, qsize_t nr)
135{
136 if (sb_any_quota_enabled(inode->i_sb)) {
137 /* Used space is updated in alloc_space() */
138 if (inode->i_sb->dq_op->alloc_space(inode, nr, 0) == NO_QUOTA)
139 return 1;
140 }
141 else
142 inode_add_bytes(inode, nr);
143 return 0;
144}
145
146static inline int vfs_dq_alloc_space(struct inode *inode, qsize_t nr)
147{
148 int ret;
149 if (!(ret = vfs_dq_alloc_space_nodirty(inode, nr)))
150 mark_inode_dirty(inode);
151 return ret;
152}
153
154static inline int vfs_dq_alloc_inode(struct inode *inode)
155{
156 if (sb_any_quota_enabled(inode->i_sb)) {
157 vfs_dq_init(inode);
158 if (inode->i_sb->dq_op->alloc_inode(inode, 1) == NO_QUOTA)
159 return 1;
160 }
161 return 0;
162}
163
164static inline void vfs_dq_free_space_nodirty(struct inode *inode, qsize_t nr)
165{
166 if (sb_any_quota_enabled(inode->i_sb))
167 inode->i_sb->dq_op->free_space(inode, nr);
168 else
169 inode_sub_bytes(inode, nr);
170}
171
172static inline void vfs_dq_free_space(struct inode *inode, qsize_t nr)
173{
174 vfs_dq_free_space_nodirty(inode, nr);
175 mark_inode_dirty(inode);
176}
177
178static inline void vfs_dq_free_inode(struct inode *inode)
179{
180 if (sb_any_quota_enabled(inode->i_sb))
181 inode->i_sb->dq_op->free_inode(inode, 1);
182}
183
184/* The following two functions cannot be called inside a transaction */
185static inline void vfs_dq_sync(struct super_block *sb)
186{
187 sync_dquots(sb, -1);
188}
189
190static inline int vfs_dq_off(struct super_block *sb, int remount)
191{
192 int ret = -ENOSYS;
193
194 if (sb->s_qcop && sb->s_qcop->quota_off)
195 ret = sb->s_qcop->quota_off(sb, -1, remount);
196 return ret;
197}
198
199#else
200
201static inline int sb_has_quota_enabled(struct super_block *sb, int type)
202{
203 return 0;
204}
205
206static inline int sb_any_quota_enabled(struct super_block *sb)
207{
208 return 0;
209}
210
211static inline int sb_has_quota_suspended(struct super_block *sb, int type)
212{
213 return 0;
214}
215
216static inline int sb_any_quota_suspended(struct super_block *sb)
217{
218 return 0;
219}
220
221/*
222 * NO-OP when quota not configured.
223 */
224#define sb_dquot_ops (NULL)
225#define sb_quotactl_ops (NULL)
226
227static inline void vfs_dq_init(struct inode *inode)
228{
229}
230
231static inline void vfs_dq_drop(struct inode *inode)
232{
233}
234
235static inline int vfs_dq_alloc_inode(struct inode *inode)
236{
237 return 0;
238}
239
240static inline void vfs_dq_free_inode(struct inode *inode)
241{
242}
243
244static inline void vfs_dq_sync(struct super_block *sb)
245{
246}
247
248static inline int vfs_dq_off(struct super_block *sb, int remount)
249{
250 return 0;
251}
252
253static inline int vfs_dq_quota_on_remount(struct super_block *sb)
254{
255 return 0;
256}
257
258static inline int vfs_dq_transfer(struct inode *inode, struct iattr *iattr)
259{
260 return 0;
261}
262
263static inline int vfs_dq_prealloc_space_nodirty(struct inode *inode, qsize_t nr)
264{
265 inode_add_bytes(inode, nr);
266 return 0;
267}
268
269static inline int vfs_dq_prealloc_space(struct inode *inode, qsize_t nr)
270{
271 vfs_dq_prealloc_space_nodirty(inode, nr);
272 mark_inode_dirty(inode);
273 return 0;
274}
275
276static inline int vfs_dq_alloc_space_nodirty(struct inode *inode, qsize_t nr)
277{
278 inode_add_bytes(inode, nr);
279 return 0;
280}
281
282static inline int vfs_dq_alloc_space(struct inode *inode, qsize_t nr)
283{
284 vfs_dq_alloc_space_nodirty(inode, nr);
285 mark_inode_dirty(inode);
286 return 0;
287}
288
289static inline void vfs_dq_free_space_nodirty(struct inode *inode, qsize_t nr)
290{
291 inode_sub_bytes(inode, nr);
292}
293
294static inline void vfs_dq_free_space(struct inode *inode, qsize_t nr)
295{
296 vfs_dq_free_space_nodirty(inode, nr);
297 mark_inode_dirty(inode);
298}
299
300#endif /* CONFIG_QUOTA */
301
302static inline int vfs_dq_prealloc_block_nodirty(struct inode *inode, qsize_t nr)
303{
304 return vfs_dq_prealloc_space_nodirty(inode,
305 nr << inode->i_sb->s_blocksize_bits);
306}
307
308static inline int vfs_dq_prealloc_block(struct inode *inode, qsize_t nr)
309{
310 return vfs_dq_prealloc_space(inode,
311 nr << inode->i_sb->s_blocksize_bits);
312}
313
314static inline int vfs_dq_alloc_block_nodirty(struct inode *inode, qsize_t nr)
315{
316 return vfs_dq_alloc_space_nodirty(inode,
317 nr << inode->i_sb->s_blocksize_bits);
318}
319
320static inline int vfs_dq_alloc_block(struct inode *inode, qsize_t nr)
321{
322 return vfs_dq_alloc_space(inode,
323 nr << inode->i_sb->s_blocksize_bits);
324}
325
326static inline void vfs_dq_free_block_nodirty(struct inode *inode, qsize_t nr)
327{
328 vfs_dq_free_space_nodirty(inode, nr << inode->i_sb->s_blocksize_bits);
329}
330
331static inline void vfs_dq_free_block(struct inode *inode, qsize_t nr)
332{
333 vfs_dq_free_space(inode, nr << inode->i_sb->s_blocksize_bits);
334}
335
336/*
337 * Define uppercase equivalents for compatibility with old function names
338 * Can go away when we think all users have been converted (15/04/2008)
339 */
340#define DQUOT_INIT(inode) vfs_dq_init(inode)
341#define DQUOT_DROP(inode) vfs_dq_drop(inode)
342#define DQUOT_PREALLOC_SPACE_NODIRTY(inode, nr) \
343 vfs_dq_prealloc_space_nodirty(inode, nr)
344#define DQUOT_PREALLOC_SPACE(inode, nr) vfs_dq_prealloc_space(inode, nr)
345#define DQUOT_ALLOC_SPACE_NODIRTY(inode, nr) \
346 vfs_dq_alloc_space_nodirty(inode, nr)
347#define DQUOT_ALLOC_SPACE(inode, nr) vfs_dq_alloc_space(inode, nr)
348#define DQUOT_PREALLOC_BLOCK_NODIRTY(inode, nr) \
349 vfs_dq_prealloc_block_nodirty(inode, nr)
350#define DQUOT_PREALLOC_BLOCK(inode, nr) vfs_dq_prealloc_block(inode, nr)
351#define DQUOT_ALLOC_BLOCK_NODIRTY(inode, nr) \
352 vfs_dq_alloc_block_nodirty(inode, nr)
353#define DQUOT_ALLOC_BLOCK(inode, nr) vfs_dq_alloc_block(inode, nr)
354#define DQUOT_ALLOC_INODE(inode) vfs_dq_alloc_inode(inode)
355#define DQUOT_FREE_SPACE_NODIRTY(inode, nr) \
356 vfs_dq_free_space_nodirty(inode, nr)
357#define DQUOT_FREE_SPACE(inode, nr) vfs_dq_free_space(inode, nr)
358#define DQUOT_FREE_BLOCK_NODIRTY(inode, nr) \
359 vfs_dq_free_block_nodirty(inode, nr)
360#define DQUOT_FREE_BLOCK(inode, nr) vfs_dq_free_block(inode, nr)
361#define DQUOT_FREE_INODE(inode) vfs_dq_free_inode(inode)
362#define DQUOT_TRANSFER(inode, iattr) vfs_dq_transfer(inode, iattr)
363#define DQUOT_SYNC(sb) vfs_dq_sync(sb)
364#define DQUOT_OFF(sb, remount) vfs_dq_off(sb, remount)
365#define DQUOT_ON_REMOUNT(sb) vfs_dq_quota_on_remount(sb)
366
367#endif /* _LINUX_QUOTAOPS_ */