Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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
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);
53extern void __v9fs_fscache_wait_on_page_write(struct inode *inode,
54 struct page *page);
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{
91 struct v9fs_inode *v9inode = V9FS_I(inode);
92 fscache_uncache_page(v9inode->fscache, page);
93 BUG_ON(PageFsCache(page));
94}
95
96static inline void v9fs_fscache_set_key(struct inode *inode,
97 struct p9_qid *qid)
98{
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);
103}
104
105static 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
111#else /* CONFIG_9P_FSCACHE */
112
113static inline int v9fs_fscache_release_page(struct page *page,
114 gfp_t gfp) {
115 return 1;
116}
117
118static inline void v9fs_fscache_invalidate_page(struct page *page) {}
119
120static inline int v9fs_readpage_from_fscache(struct inode *inode,
121 struct page *page)
122{
123 return -ENOBUFS;
124}
125
126static 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
134static inline void v9fs_readpage_to_fscache(struct inode *inode,
135 struct page *page)
136{}
137
138static inline void v9fs_uncache_page(struct inode *inode, struct page *page)
139{}
140
141static inline void v9fs_fscache_wait_on_page_write(struct inode *inode,
142 struct page *page)
143{
144 return;
145}
146
147#endif /* CONFIG_9P_FSCACHE */
148#endif /* _9P_CACHE_H */