Linux Kernel  3.7.1
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
cache.h
Go to the documentation of this file.
1 /*
2  * V9FS cache definitions.
3  *
4  * Copyright (C) 2009 by Abhishek Kulkarni <[email protected]>
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 #ifdef CONFIG_9P_FSCACHE
25 #include <linux/fscache.h>
26 #include <linux/spinlock.h>
27 
28 extern struct fscache_netfs v9fs_cache_netfs;
29 extern const struct fscache_cookie_def v9fs_cache_session_index_def;
30 extern const struct fscache_cookie_def v9fs_cache_inode_index_def;
31 
32 extern void v9fs_cache_session_get_cookie(struct v9fs_session_info *v9ses);
33 extern void v9fs_cache_session_put_cookie(struct v9fs_session_info *v9ses);
34 
35 extern void v9fs_cache_inode_get_cookie(struct inode *inode);
36 extern void v9fs_cache_inode_put_cookie(struct inode *inode);
37 extern void v9fs_cache_inode_flush_cookie(struct inode *inode);
38 extern void v9fs_cache_inode_set_cookie(struct inode *inode, struct file *filp);
39 extern void v9fs_cache_inode_reset_cookie(struct inode *inode);
40 
41 extern int __v9fs_cache_register(void);
42 extern void __v9fs_cache_unregister(void);
43 
44 extern int __v9fs_fscache_release_page(struct page *page, gfp_t gfp);
45 extern void __v9fs_fscache_invalidate_page(struct page *page);
46 extern int __v9fs_readpage_from_fscache(struct inode *inode,
47  struct page *page);
48 extern int __v9fs_readpages_from_fscache(struct inode *inode,
49  struct address_space *mapping,
50  struct list_head *pages,
51  unsigned *nr_pages);
52 extern void __v9fs_readpage_to_fscache(struct inode *inode, struct page *page);
53 extern void __v9fs_fscache_wait_on_page_write(struct inode *inode,
54  struct page *page);
55 
56 static inline int v9fs_fscache_release_page(struct page *page,
57  gfp_t gfp)
58 {
59  return __v9fs_fscache_release_page(page, gfp);
60 }
61 
62 static inline void v9fs_fscache_invalidate_page(struct page *page)
63 {
64  __v9fs_fscache_invalidate_page(page);
65 }
66 
67 static inline int v9fs_readpage_from_fscache(struct inode *inode,
68  struct page *page)
69 {
70  return __v9fs_readpage_from_fscache(inode, page);
71 }
72 
73 static inline int v9fs_readpages_from_fscache(struct inode *inode,
74  struct address_space *mapping,
75  struct list_head *pages,
76  unsigned *nr_pages)
77 {
78  return __v9fs_readpages_from_fscache(inode, mapping, pages,
79  nr_pages);
80 }
81 
82 static inline void v9fs_readpage_to_fscache(struct inode *inode,
83  struct page *page)
84 {
85  if (PageFsCache(page))
86  __v9fs_readpage_to_fscache(inode, page);
87 }
88 
89 static inline void v9fs_uncache_page(struct inode *inode, struct page *page)
90 {
91  struct v9fs_inode *v9inode = V9FS_I(inode);
92  fscache_uncache_page(v9inode->fscache, page);
93  BUG_ON(PageFsCache(page));
94 }
95 
96 static inline void v9fs_fscache_wait_on_page_write(struct inode *inode,
97  struct page *page)
98 {
99  return __v9fs_fscache_wait_on_page_write(inode, page);
100 }
101 
102 #else /* CONFIG_9P_FSCACHE */
103 
104 static inline int v9fs_fscache_release_page(struct page *page,
105  gfp_t gfp) {
106  return 1;
107 }
108 
109 static inline void v9fs_fscache_invalidate_page(struct page *page) {}
110 
111 static inline int v9fs_readpage_from_fscache(struct inode *inode,
112  struct page *page)
113 {
114  return -ENOBUFS;
115 }
116 
117 static inline int v9fs_readpages_from_fscache(struct inode *inode,
118  struct address_space *mapping,
119  struct list_head *pages,
120  unsigned *nr_pages)
121 {
122  return -ENOBUFS;
123 }
124 
125 static inline void v9fs_readpage_to_fscache(struct inode *inode,
126  struct page *page)
127 {}
128 
129 static inline void v9fs_uncache_page(struct inode *inode, struct page *page)
130 {}
131 
132 static inline void v9fs_fscache_wait_on_page_write(struct inode *inode,
133  struct page *page)
134 {
135  return;
136 }
137 
138 #endif /* CONFIG_9P_FSCACHE */
139 #endif /* _9P_CACHE_H */
Generated on Thu Jan 10 2013 12:49:13 for Linux Kernel by   doxygen 1.8.2