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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 | #ifdef CONFIG_9P_FSCACHE | |
25 | #include <linux/fscache.h> | |
26 | #include <linux/spinlock.h> | |
27 | ||
60e78d2c AK |
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); | |
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53 | extern void __v9fs_fscache_wait_on_page_write(struct inode *inode, |
54 | struct page *page); | |
60e78d2c AK |
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 | { | |
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91 | struct v9fs_inode *v9inode = V9FS_I(inode); |
92 | fscache_uncache_page(v9inode->fscache, page); | |
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93 | BUG_ON(PageFsCache(page)); |
94 | } | |
95 | ||
a78ce05d | 96 | static inline void v9fs_fscache_set_key(struct inode *inode, |
60e78d2c AK |
97 | struct p9_qid *qid) |
98 | { | |
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99 | struct v9fs_inode *v9inode = V9FS_I(inode); |
100 | spin_lock(&v9inode->fscache_lock); | |
101 | v9inode->fscache_key = qid; | |
102 | spin_unlock(&v9inode->fscache_lock); | |
60e78d2c AK |
103 | } |
104 | ||
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105 | static inline void v9fs_fscache_wait_on_page_write(struct inode *inode, |
106 | struct page *page) | |
107 | { | |
108 | return __v9fs_fscache_wait_on_page_write(inode, page); | |
109 | } | |
110 | ||
60e78d2c AK |
111 | #else /* CONFIG_9P_FSCACHE */ |
112 | ||
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113 | static inline int v9fs_fscache_release_page(struct page *page, |
114 | gfp_t gfp) { | |
115 | return 1; | |
116 | } | |
117 | ||
118 | static inline void v9fs_fscache_invalidate_page(struct page *page) {} | |
119 | ||
120 | static inline int v9fs_readpage_from_fscache(struct inode *inode, | |
121 | struct page *page) | |
122 | { | |
123 | return -ENOBUFS; | |
124 | } | |
125 | ||
126 | static inline int v9fs_readpages_from_fscache(struct inode *inode, | |
127 | struct address_space *mapping, | |
128 | struct list_head *pages, | |
129 | unsigned *nr_pages) | |
130 | { | |
131 | return -ENOBUFS; | |
132 | } | |
133 | ||
134 | static inline void v9fs_readpage_to_fscache(struct inode *inode, | |
135 | struct page *page) | |
136 | {} | |
137 | ||
138 | static inline void v9fs_uncache_page(struct inode *inode, struct page *page) | |
139 | {} | |
140 | ||
2efda799 AK |
141 | static inline void v9fs_fscache_wait_on_page_write(struct inode *inode, |
142 | struct page *page) | |
143 | { | |
144 | return; | |
145 | } | |
146 | ||
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147 | #endif /* CONFIG_9P_FSCACHE */ |
148 | #endif /* _9P_CACHE_H */ |