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1 /*
2 * V9FS cache definitions.
3 *
4 * Copyright (C) 2009 by Abhishek Kulkarni <adkulkar@umail.iu.edu>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2
8 * as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to:
17 * Free Software Foundation
18 * 51 Franklin Street, Fifth Floor
19 * Boston, MA 02111-1301 USA
20 *
21 */
22
23 #ifndef _9P_CACHE_H
24 #define _9P_CACHE_H
25 #ifdef CONFIG_9P_FSCACHE
26 #include <linux/fscache.h>
27 #include <linux/spinlock.h>
28
29 extern struct fscache_netfs v9fs_cache_netfs;
30 extern const struct fscache_cookie_def v9fs_cache_session_index_def;
31 extern const struct fscache_cookie_def v9fs_cache_inode_index_def;
32
33 extern void v9fs_cache_session_get_cookie(struct v9fs_session_info *v9ses);
34 extern void v9fs_cache_session_put_cookie(struct v9fs_session_info *v9ses);
35
36 extern void v9fs_cache_inode_get_cookie(struct inode *inode);
37 extern void v9fs_cache_inode_put_cookie(struct inode *inode);
38 extern void v9fs_cache_inode_flush_cookie(struct inode *inode);
39 extern void v9fs_cache_inode_set_cookie(struct inode *inode, struct file *filp);
40 extern void v9fs_cache_inode_reset_cookie(struct inode *inode);
41
42 extern int __v9fs_cache_register(void);
43 extern void __v9fs_cache_unregister(void);
44
45 extern int __v9fs_fscache_release_page(struct page *page, gfp_t gfp);
46 extern void __v9fs_fscache_invalidate_page(struct page *page);
47 extern int __v9fs_readpage_from_fscache(struct inode *inode,
48 struct page *page);
49 extern int __v9fs_readpages_from_fscache(struct inode *inode,
50 struct address_space *mapping,
51 struct list_head *pages,
52 unsigned *nr_pages);
53 extern void __v9fs_readpage_to_fscache(struct inode *inode, struct page *page);
54 extern void __v9fs_fscache_wait_on_page_write(struct inode *inode,
55 struct page *page);
56
57 static inline int v9fs_fscache_release_page(struct page *page,
58 gfp_t gfp)
59 {
60 return __v9fs_fscache_release_page(page, gfp);
61 }
62
63 static inline void v9fs_fscache_invalidate_page(struct page *page)
64 {
65 __v9fs_fscache_invalidate_page(page);
66 }
67
68 static inline int v9fs_readpage_from_fscache(struct inode *inode,
69 struct page *page)
70 {
71 return __v9fs_readpage_from_fscache(inode, page);
72 }
73
74 static inline int v9fs_readpages_from_fscache(struct inode *inode,
75 struct address_space *mapping,
76 struct list_head *pages,
77 unsigned *nr_pages)
78 {
79 return __v9fs_readpages_from_fscache(inode, mapping, pages,
80 nr_pages);
81 }
82
83 static inline void v9fs_readpage_to_fscache(struct inode *inode,
84 struct page *page)
85 {
86 if (PageFsCache(page))
87 __v9fs_readpage_to_fscache(inode, page);
88 }
89
90 static inline void v9fs_uncache_page(struct inode *inode, struct page *page)
91 {
92 struct v9fs_inode *v9inode = V9FS_I(inode);
93 fscache_uncache_page(v9inode->fscache, page);
94 BUG_ON(PageFsCache(page));
95 }
96
97 static inline void v9fs_fscache_wait_on_page_write(struct inode *inode,
98 struct page *page)
99 {
100 return __v9fs_fscache_wait_on_page_write(inode, page);
101 }
102
103 #else /* CONFIG_9P_FSCACHE */
104
105 static inline void v9fs_cache_inode_get_cookie(struct inode *inode)
106 {
107 }
108
109 static inline void v9fs_cache_inode_put_cookie(struct inode *inode)
110 {
111 }
112
113 static inline void v9fs_cache_inode_set_cookie(struct inode *inode, struct file *file)
114 {
115 }
116
117 static inline int v9fs_fscache_release_page(struct page *page,
118 gfp_t gfp) {
119 return 1;
120 }
121
122 static inline void v9fs_fscache_invalidate_page(struct page *page) {}
123
124 static inline int v9fs_readpage_from_fscache(struct inode *inode,
125 struct page *page)
126 {
127 return -ENOBUFS;
128 }
129
130 static inline int v9fs_readpages_from_fscache(struct inode *inode,
131 struct address_space *mapping,
132 struct list_head *pages,
133 unsigned *nr_pages)
134 {
135 return -ENOBUFS;
136 }
137
138 static inline void v9fs_readpage_to_fscache(struct inode *inode,
139 struct page *page)
140 {}
141
142 static inline void v9fs_uncache_page(struct inode *inode, struct page *page)
143 {}
144
145 static inline void v9fs_fscache_wait_on_page_write(struct inode *inode,
146 struct page *page)
147 {
148 return;
149 }
150
151 #endif /* CONFIG_9P_FSCACHE */
152 #endif /* _9P_CACHE_H */