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
15 #include <linux/fs.h>
16
17 #if defined(CONFIG_QUOTA)
18
19 /*
20 * declaration of quota_function calls in kernel.
21 */
22 extern void sync_dquots(struct super_block *sb, int type);
23
24 extern int dquot_initialize(struct inode *inode, int type);
25 extern int dquot_drop(struct inode *inode);
26
27 extern int dquot_alloc_space(struct inode *inode, qsize_t number, int prealloc);
28 extern int dquot_alloc_inode(const struct inode *inode, unsigned long number);
29
30 extern int dquot_free_space(struct inode *inode, qsize_t number);
31 extern int dquot_free_inode(const struct inode *inode, unsigned long number);
32
33 extern int dquot_transfer(struct inode *inode, struct iattr *iattr);
34 extern int dquot_commit(struct dquot *dquot);
35 extern int dquot_acquire(struct dquot *dquot);
36 extern int dquot_release(struct dquot *dquot);
37 extern int dquot_commit_info(struct super_block *sb, int type);
38 extern int dquot_mark_dquot_dirty(struct dquot *dquot);
39
40 extern int vfs_quota_on(struct super_block *sb, int type, int format_id, char *path);
41 extern int vfs_quota_on_mount(struct super_block *sb, char *qf_name,
42 int format_id, int type);
43 extern int vfs_quota_off(struct super_block *sb, int type);
44 #define vfs_quota_off_mount(sb, type) vfs_quota_off(sb, type)
45 extern int vfs_quota_sync(struct super_block *sb, int type);
46 extern int vfs_get_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii);
47 extern int vfs_set_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii);
48 extern int vfs_get_dqblk(struct super_block *sb, int type, qid_t id, struct if_dqblk *di);
49 extern int vfs_set_dqblk(struct super_block *sb, int type, qid_t id, struct if_dqblk *di);
50
51 /*
52 * Operations supported for diskquotas.
53 */
54 extern struct dquot_operations dquot_operations;
55 extern struct quotactl_ops vfs_quotactl_ops;
56
57 #define sb_dquot_ops (&dquot_operations)
58 #define sb_quotactl_ops (&vfs_quotactl_ops)
59
60 /* It is better to call this function outside of any transaction as it might
61 * need a lot of space in journal for dquot structure allocation. */
62 static __inline__ void DQUOT_INIT(struct inode *inode)
63 {
64 BUG_ON(!inode->i_sb);
65 if (sb_any_quota_enabled(inode->i_sb) && !IS_NOQUOTA(inode))
66 inode->i_sb->dq_op->initialize(inode, -1);
67 }
68
69 /* The same as with DQUOT_INIT */
70 static __inline__ void DQUOT_DROP(struct inode *inode)
71 {
72 /* Here we can get arbitrary inode from clear_inode() so we have
73 * to be careful. OTOH we don't need locking as quota operations
74 * are allowed to change only at mount time */
75 if (!IS_NOQUOTA(inode) && inode->i_sb && inode->i_sb->dq_op
76 && inode->i_sb->dq_op->drop) {
77 int cnt;
78 /* Test before calling to rule out calls from proc and such
79 * where we are not allowed to block. Note that this is
80 * actually reliable test even without the lock - the caller
81 * must assure that nobody can come after the DQUOT_DROP and
82 * add quota pointers back anyway */
83 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
84 if (inode->i_dquot[cnt] != NODQUOT)
85 break;
86 if (cnt < MAXQUOTAS)
87 inode->i_sb->dq_op->drop(inode);
88 }
89 }
90
91 /* The following allocation/freeing/transfer functions *must* be called inside
92 * a transaction (deadlocks possible otherwise) */
93 static __inline__ int DQUOT_PREALLOC_SPACE_NODIRTY(struct inode *inode, qsize_t nr)
94 {
95 if (sb_any_quota_enabled(inode->i_sb)) {
96 /* Used space is updated in alloc_space() */
97 if (inode->i_sb->dq_op->alloc_space(inode, nr, 1) == NO_QUOTA)
98 return 1;
99 }
100 else
101 inode_add_bytes(inode, nr);
102 return 0;
103 }
104
105 static __inline__ int DQUOT_PREALLOC_SPACE(struct inode *inode, qsize_t nr)
106 {
107 int ret;
108 if (!(ret = DQUOT_PREALLOC_SPACE_NODIRTY(inode, nr)))
109 mark_inode_dirty(inode);
110 return ret;
111 }
112
113 static __inline__ int DQUOT_ALLOC_SPACE_NODIRTY(struct inode *inode, qsize_t nr)
114 {
115 if (sb_any_quota_enabled(inode->i_sb)) {
116 /* Used space is updated in alloc_space() */
117 if (inode->i_sb->dq_op->alloc_space(inode, nr, 0) == NO_QUOTA)
118 return 1;
119 }
120 else
121 inode_add_bytes(inode, nr);
122 return 0;
123 }
124
125 static __inline__ int DQUOT_ALLOC_SPACE(struct inode *inode, qsize_t nr)
126 {
127 int ret;
128 if (!(ret = DQUOT_ALLOC_SPACE_NODIRTY(inode, nr)))
129 mark_inode_dirty(inode);
130 return ret;
131 }
132
133 static __inline__ int DQUOT_ALLOC_INODE(struct inode *inode)
134 {
135 if (sb_any_quota_enabled(inode->i_sb)) {
136 DQUOT_INIT(inode);
137 if (inode->i_sb->dq_op->alloc_inode(inode, 1) == NO_QUOTA)
138 return 1;
139 }
140 return 0;
141 }
142
143 static __inline__ void DQUOT_FREE_SPACE_NODIRTY(struct inode *inode, qsize_t nr)
144 {
145 if (sb_any_quota_enabled(inode->i_sb))
146 inode->i_sb->dq_op->free_space(inode, nr);
147 else
148 inode_sub_bytes(inode, nr);
149 }
150
151 static __inline__ void DQUOT_FREE_SPACE(struct inode *inode, qsize_t nr)
152 {
153 DQUOT_FREE_SPACE_NODIRTY(inode, nr);
154 mark_inode_dirty(inode);
155 }
156
157 static __inline__ void DQUOT_FREE_INODE(struct inode *inode)
158 {
159 if (sb_any_quota_enabled(inode->i_sb))
160 inode->i_sb->dq_op->free_inode(inode, 1);
161 }
162
163 static __inline__ int DQUOT_TRANSFER(struct inode *inode, struct iattr *iattr)
164 {
165 if (sb_any_quota_enabled(inode->i_sb) && !IS_NOQUOTA(inode)) {
166 DQUOT_INIT(inode);
167 if (inode->i_sb->dq_op->transfer(inode, iattr) == NO_QUOTA)
168 return 1;
169 }
170 return 0;
171 }
172
173 /* The following two functions cannot be called inside a transaction */
174 #define DQUOT_SYNC(sb) sync_dquots(sb, -1)
175
176 static __inline__ int DQUOT_OFF(struct super_block *sb)
177 {
178 int ret = -ENOSYS;
179
180 if (sb_any_quota_enabled(sb) && sb->s_qcop && sb->s_qcop->quota_off)
181 ret = sb->s_qcop->quota_off(sb, -1);
182 return ret;
183 }
184
185 #else
186
187 /*
188 * NO-OP when quota not configured.
189 */
190 #define sb_dquot_ops (NULL)
191 #define sb_quotactl_ops (NULL)
192 #define DQUOT_INIT(inode) do { } while(0)
193 #define DQUOT_DROP(inode) do { } while(0)
194 #define DQUOT_ALLOC_INODE(inode) (0)
195 #define DQUOT_FREE_INODE(inode) do { } while(0)
196 #define DQUOT_SYNC(sb) do { } while(0)
197 #define DQUOT_OFF(sb) do { } while(0)
198 #define DQUOT_TRANSFER(inode, iattr) (0)
199 static inline int DQUOT_PREALLOC_SPACE_NODIRTY(struct inode *inode, qsize_t nr)
200 {
201 inode_add_bytes(inode, nr);
202 return 0;
203 }
204
205 static inline int DQUOT_PREALLOC_SPACE(struct inode *inode, qsize_t nr)
206 {
207 DQUOT_PREALLOC_SPACE_NODIRTY(inode, nr);
208 mark_inode_dirty(inode);
209 return 0;
210 }
211
212 static inline int DQUOT_ALLOC_SPACE_NODIRTY(struct inode *inode, qsize_t nr)
213 {
214 inode_add_bytes(inode, nr);
215 return 0;
216 }
217
218 static inline int DQUOT_ALLOC_SPACE(struct inode *inode, qsize_t nr)
219 {
220 DQUOT_ALLOC_SPACE_NODIRTY(inode, nr);
221 mark_inode_dirty(inode);
222 return 0;
223 }
224
225 static inline void DQUOT_FREE_SPACE_NODIRTY(struct inode *inode, qsize_t nr)
226 {
227 inode_sub_bytes(inode, nr);
228 }
229
230 static inline void DQUOT_FREE_SPACE(struct inode *inode, qsize_t nr)
231 {
232 DQUOT_FREE_SPACE_NODIRTY(inode, nr);
233 mark_inode_dirty(inode);
234 }
235
236 #endif /* CONFIG_QUOTA */
237
238 #define DQUOT_PREALLOC_BLOCK_NODIRTY(inode, nr) DQUOT_PREALLOC_SPACE_NODIRTY(inode, ((qsize_t)(nr)) << (inode)->i_sb->s_blocksize_bits)
239 #define DQUOT_PREALLOC_BLOCK(inode, nr) DQUOT_PREALLOC_SPACE(inode, ((qsize_t)(nr)) << (inode)->i_sb->s_blocksize_bits)
240 #define DQUOT_ALLOC_BLOCK_NODIRTY(inode, nr) DQUOT_ALLOC_SPACE_NODIRTY(inode, ((qsize_t)(nr)) << (inode)->i_sb->s_blocksize_bits)
241 #define DQUOT_ALLOC_BLOCK(inode, nr) DQUOT_ALLOC_SPACE(inode, ((qsize_t)(nr)) << (inode)->i_sb->s_blocksize_bits)
242 #define DQUOT_FREE_BLOCK_NODIRTY(inode, nr) DQUOT_FREE_SPACE_NODIRTY(inode, ((qsize_t)(nr)) << (inode)->i_sb->s_blocksize_bits)
243 #define DQUOT_FREE_BLOCK(inode, nr) DQUOT_FREE_SPACE(inode, ((qsize_t)(nr)) << (inode)->i_sb->s_blocksize_bits)
244
245 #endif /* _LINUX_QUOTAOPS_ */
246
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