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/config.h>
14
15 #if defined(CONFIG_QUOTA)
16
17 #include <linux/smp_lock.h>
18
19 /*
20 * declaration of quota_function calls in kernel.
21 */
22 extern void dquot_initialize(struct inode *inode, short type);
23 extern void dquot_drop(struct inode *inode);
24 extern void invalidate_dquots(kdev_t dev, short type);
25 extern int quota_off(struct super_block *sb, short type);
26 extern int sync_dquots(kdev_t dev, short type);
27
28 extern int dquot_alloc_block(const struct inode *inode, unsigned long number, char prealloc);
29 extern int dquot_alloc_inode(const struct inode *inode, unsigned long number);
30
31 extern void dquot_free_block(const struct inode *inode, unsigned long number);
32 extern void dquot_free_inode(const struct inode *inode, unsigned long number);
33
34 extern int dquot_transfer(struct dentry *dentry, struct iattr *iattr);
35
36 /*
37 * Operations supported for diskquotas.
38 */
39 extern __inline__ void DQUOT_INIT(struct inode *inode)
40 {
41 if (inode->i_sb && inode->i_sb->dq_op)
42 inode->i_sb->dq_op->initialize(inode, -1);
43 }
44
45 extern __inline__ void DQUOT_DROP(struct inode *inode)
46 {
47 if (IS_QUOTAINIT(inode)) {
48 if (inode->i_sb && inode->i_sb->dq_op)
49 inode->i_sb->dq_op->drop(inode);
50 }
51 }
52
53 extern __inline__ int DQUOT_PREALLOC_BLOCK(struct super_block *sb, const struct inode *inode, int nr)
54 {
55 if (sb->dq_op) {
56 if (sb->dq_op->alloc_block(inode, fs_to_dq_blocks(nr, sb->s_blocksize), 1) == NO_QUOTA)
57 return 1;
58 }
59 return 0;
60 }
61
62 extern __inline__ int DQUOT_ALLOC_BLOCK(struct super_block *sb, const struct inode *inode, int nr)
63 {
64 if (sb->dq_op) {
65 if (sb->dq_op->alloc_block(inode, fs_to_dq_blocks(nr, sb->s_blocksize), 0) == NO_QUOTA)
66 return 1;
67 }
68 return 0;
69 }
70
71 extern __inline__ int DQUOT_ALLOC_INODE(struct super_block *sb, struct inode *inode)
72 {
73 if (sb->dq_op) {
74 sb->dq_op->initialize (inode, -1);
75 if (sb->dq_op->alloc_inode (inode, 1))
76 return 1;
77 }
78 inode->i_flags |= S_QUOTA;
79 return 0;
80 }
81
82 extern __inline__ void DQUOT_FREE_BLOCK(struct super_block *sb, const struct inode *inode, int nr)
83 {
84 if (sb->dq_op)
85 sb->dq_op->free_block(inode, fs_to_dq_blocks(nr, sb->s_blocksize));
86 }
87
88 extern __inline__ void DQUOT_FREE_INODE(struct super_block *sb, struct inode *inode)
89 {
90 if (sb->dq_op)
91 sb->dq_op->free_inode(inode, 1);
92 }
93
94 extern __inline__ int DQUOT_TRANSFER(struct dentry *dentry, struct iattr *iattr)
95 {
96 int error = -EDQUOT;
97
98 if (dentry->d_inode->i_sb->dq_op) {
99 dentry->d_inode->i_sb->dq_op->initialize(dentry->d_inode, -1);
100 error = dentry->d_inode->i_sb->dq_op->transfer(dentry, iattr);
101 } else {
102 error = notify_change(dentry, iattr);
103 }
104 return error;
105 }
106
107 #define DQUOT_SYNC(dev) sync_dquots(dev, -1)
108 #define DQUOT_OFF(sb) quota_off(sb, -1)
109
110 #else
111
112 /*
113 * NO-OP when quota not configured.
114 */
115 #define DQUOT_INIT(inode) do { } while(0)
116 #define DQUOT_DROP(inode) do { } while(0)
117 #define DQUOT_PREALLOC_BLOCK(sb, inode, nr) (0)
118 #define DQUOT_ALLOC_BLOCK(sb, inode, nr) (0)
119 #define DQUOT_ALLOC_INODE(sb, inode) (0)
120 #define DQUOT_FREE_BLOCK(sb, inode, nr) do { } while(0)
121 #define DQUOT_FREE_INODE(sb, inode) do { } while(0)
122 #define DQUOT_SYNC(dev) do { } while(0)
123 #define DQUOT_OFF(sb) do { } while(0)
124
125 /*
126 * Special case expands to a simple notify_change.
127 */
128 #define DQUOT_TRANSFER(dentry, iattr) notify_change(dentry, iattr)
129
130 #endif /* CONFIG_QUOTA */
131 #endif /* _LINUX_QUOTAOPS_ */
132
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