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gerrit-public.fairphone.software / kernel / msm-4.9 / 7a9cdd95fe153f86d23f63811ad4ba0ab32dad57 / . / fs / 9p / cache.h
blob: 40cc54ced5d97621b81bc96ab8b90f3644f72a4e [file] [log] [blame]
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500[diff] [blame]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
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500[diff] [blame]28extern struct fscache_netfs v9fs_cache_netfs;
29extern const struct fscache_cookie_def v9fs_cache_session_index_def;
30extern const struct fscache_cookie_def v9fs_cache_inode_index_def;
31
32extern void v9fs_cache_session_get_cookie(struct v9fs_session_info *v9ses);
33extern void v9fs_cache_session_put_cookie(struct v9fs_session_info *v9ses);
34
35extern void v9fs_cache_inode_get_cookie(struct inode *inode);
36extern void v9fs_cache_inode_put_cookie(struct inode *inode);
37extern void v9fs_cache_inode_flush_cookie(struct inode *inode);
38extern void v9fs_cache_inode_set_cookie(struct inode *inode, struct file *filp);
39extern void v9fs_cache_inode_reset_cookie(struct inode *inode);
40
41extern int __v9fs_cache_register(void);
42extern void __v9fs_cache_unregister(void);
43
44extern int __v9fs_fscache_release_page(struct page *page, gfp_t gfp);
45extern void __v9fs_fscache_invalidate_page(struct page *page);
46extern int __v9fs_readpage_from_fscache(struct inode *inode,
47 struct page *page);
48extern int __v9fs_readpages_from_fscache(struct inode *inode,
49 struct address_space *mapping,
50 struct list_head *pages,
51 unsigned *nr_pages);
52extern void __v9fs_readpage_to_fscache(struct inode *inode, struct page *page);
Aneesh Kumar K.V2efda792011-02-28 17:03:56 +0530[diff] [blame]53extern void __v9fs_fscache_wait_on_page_write(struct inode *inode,
54 struct page *page);
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500[diff] [blame]55
56static inline int v9fs_fscache_release_page(struct page *page,
57 gfp_t gfp)
58{
59 return __v9fs_fscache_release_page(page, gfp);
60}
61
62static inline void v9fs_fscache_invalidate_page(struct page *page)
63{
64 __v9fs_fscache_invalidate_page(page);
65}
66
67static inline int v9fs_readpage_from_fscache(struct inode *inode,
68 struct page *page)
69{
70 return __v9fs_readpage_from_fscache(inode, page);
71}
72
73static 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
82static 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
89static inline void v9fs_uncache_page(struct inode *inode, struct page *page)
90{
Aneesh Kumar K.Va78ce052011-02-28 17:04:02 +0530[diff] [blame]91 struct v9fs_inode *v9inode = V9FS_I(inode);
92 fscache_uncache_page(v9inode->fscache, page);
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500[diff] [blame]93 BUG_ON(PageFsCache(page));
94}
95
Aneesh Kumar K.V2efda792011-02-28 17:03:56 +0530[diff] [blame]96static 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
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500[diff] [blame]102#else /* CONFIG_9P_FSCACHE */
103
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500[diff] [blame]104static inline int v9fs_fscache_release_page(struct page *page,
105 gfp_t gfp) {
106 return 1;
107}
108
109static inline void v9fs_fscache_invalidate_page(struct page *page) {}
110
111static inline int v9fs_readpage_from_fscache(struct inode *inode,
112 struct page *page)
113{
114 return -ENOBUFS;
115}
116
117static 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
125static inline void v9fs_readpage_to_fscache(struct inode *inode,
126 struct page *page)
127{}
128
129static inline void v9fs_uncache_page(struct inode *inode, struct page *page)
130{}
131
Aneesh Kumar K.V2efda792011-02-28 17:03:56 +0530[diff] [blame]132static inline void v9fs_fscache_wait_on_page_write(struct inode *inode,
133 struct page *page)
134{
135 return;
136}
137
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500[diff] [blame]138#endif /* CONFIG_9P_FSCACHE */
139#endif /* _9P_CACHE_H */