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gerrit-public.fairphone.software / kernel / msm-4.9 / refs/tags/FP3-REL-Q-3.A.0107 / . / fs / 9p / cache.h
blob: 247e47e54bcc2c0836a334172367a140884d5c08 [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
Tzvetelin Katchov7c7afc42015-10-07 20:15:21 -0400[diff] [blame]24#define _9P_CACHE_H
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500[diff] [blame]25#ifdef CONFIG_9P_FSCACHE
26#include <linux/fscache.h>
27#include <linux/spinlock.h>
28
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500[diff] [blame]29extern struct fscache_netfs v9fs_cache_netfs;
30extern const struct fscache_cookie_def v9fs_cache_session_index_def;
31extern const struct fscache_cookie_def v9fs_cache_inode_index_def;
32
33extern void v9fs_cache_session_get_cookie(struct v9fs_session_info *v9ses);
34extern void v9fs_cache_session_put_cookie(struct v9fs_session_info *v9ses);
35
36extern void v9fs_cache_inode_get_cookie(struct inode *inode);
37extern void v9fs_cache_inode_put_cookie(struct inode *inode);
38extern void v9fs_cache_inode_flush_cookie(struct inode *inode);
39extern void v9fs_cache_inode_set_cookie(struct inode *inode, struct file *filp);
40extern void v9fs_cache_inode_reset_cookie(struct inode *inode);
41
42extern int __v9fs_cache_register(void);
43extern void __v9fs_cache_unregister(void);
44
45extern int __v9fs_fscache_release_page(struct page *page, gfp_t gfp);
46extern void __v9fs_fscache_invalidate_page(struct page *page);
47extern int __v9fs_readpage_from_fscache(struct inode *inode,
48 struct page *page);
49extern int __v9fs_readpages_from_fscache(struct inode *inode,
50 struct address_space *mapping,
51 struct list_head *pages,
52 unsigned *nr_pages);
53extern void __v9fs_readpage_to_fscache(struct inode *inode, struct page *page);
Aneesh Kumar K.V2efda792011-02-28 17:03:56 +0530[diff] [blame]54extern void __v9fs_fscache_wait_on_page_write(struct inode *inode,
55 struct page *page);
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500[diff] [blame]56
57static inline int v9fs_fscache_release_page(struct page *page,
58 gfp_t gfp)
59{
60 return __v9fs_fscache_release_page(page, gfp);
61}
62
63static inline void v9fs_fscache_invalidate_page(struct page *page)
64{
65 __v9fs_fscache_invalidate_page(page);
66}
67
68static inline int v9fs_readpage_from_fscache(struct inode *inode,
69 struct page *page)
70{
71 return __v9fs_readpage_from_fscache(inode, page);
72}
73
74static 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
83static 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
90static inline void v9fs_uncache_page(struct inode *inode, struct page *page)
91{
Aneesh Kumar K.Va78ce052011-02-28 17:04:02 +0530[diff] [blame]92 struct v9fs_inode *v9inode = V9FS_I(inode);
93 fscache_uncache_page(v9inode->fscache, page);
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500[diff] [blame]94 BUG_ON(PageFsCache(page));
95}
96
Aneesh Kumar K.V2efda792011-02-28 17:03:56 +0530[diff] [blame]97static 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
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500[diff] [blame]103#else /* CONFIG_9P_FSCACHE */
104
Al Viroceaec152013-09-17 08:07:11 -0400[diff] [blame]105static inline void v9fs_cache_inode_get_cookie(struct inode *inode)
106{
107}
108
109static inline void v9fs_cache_inode_put_cookie(struct inode *inode)
110{
111}
112
113static inline void v9fs_cache_inode_set_cookie(struct inode *inode, struct file *file)
114{
115}
116
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500[diff] [blame]117static inline int v9fs_fscache_release_page(struct page *page,
118 gfp_t gfp) {
119 return 1;
120}
121
122static inline void v9fs_fscache_invalidate_page(struct page *page) {}
123
124static inline int v9fs_readpage_from_fscache(struct inode *inode,
125 struct page *page)
126{
127 return -ENOBUFS;
128}
129
130static 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
138static inline void v9fs_readpage_to_fscache(struct inode *inode,
139 struct page *page)
140{}
141
142static inline void v9fs_uncache_page(struct inode *inode, struct page *page)
143{}
144
Aneesh Kumar K.V2efda792011-02-28 17:03:56 +0530[diff] [blame]145static inline void v9fs_fscache_wait_on_page_write(struct inode *inode,
146 struct page *page)
147{
148 return;
149}
150
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500[diff] [blame]151#endif /* CONFIG_9P_FSCACHE */
152#endif /* _9P_CACHE_H */