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1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * V9FS cache definitions.
4 *
5 * Copyright (C) 2009 by Abhishek Kulkarni <adkulkar@umail.iu.edu>
6 */
7
8#ifndef _9P_CACHE_H
9#define _9P_CACHE_H
10#ifdef CONFIG_9P_FSCACHE
11#include <linux/fscache.h>
12#include <linux/spinlock.h>
13
14extern struct fscache_netfs v9fs_cache_netfs;
15extern const struct fscache_cookie_def v9fs_cache_session_index_def;
16extern const struct fscache_cookie_def v9fs_cache_inode_index_def;
17
18extern void v9fs_cache_session_get_cookie(struct v9fs_session_info *v9ses);
19extern void v9fs_cache_session_put_cookie(struct v9fs_session_info *v9ses);
20
21extern void v9fs_cache_inode_get_cookie(struct inode *inode);
22extern void v9fs_cache_inode_put_cookie(struct inode *inode);
23extern void v9fs_cache_inode_flush_cookie(struct inode *inode);
24extern void v9fs_cache_inode_set_cookie(struct inode *inode, struct file *filp);
25extern void v9fs_cache_inode_reset_cookie(struct inode *inode);
26
27extern int __v9fs_cache_register(void);
28extern void __v9fs_cache_unregister(void);
29
30extern int __v9fs_fscache_release_page(struct page *page, gfp_t gfp);
31extern void __v9fs_fscache_invalidate_page(struct page *page);
32extern int __v9fs_readpage_from_fscache(struct inode *inode,
33 struct page *page);
34extern int __v9fs_readpages_from_fscache(struct inode *inode,
35 struct address_space *mapping,
36 struct list_head *pages,
37 unsigned *nr_pages);
38extern void __v9fs_readpage_to_fscache(struct inode *inode, struct page *page);
39extern void __v9fs_fscache_wait_on_page_write(struct inode *inode,
40 struct page *page);
41
42static inline int v9fs_fscache_release_page(struct page *page,
43 gfp_t gfp)
44{
45 return __v9fs_fscache_release_page(page, gfp);
46}
47
48static inline void v9fs_fscache_invalidate_page(struct page *page)
49{
50 __v9fs_fscache_invalidate_page(page);
51}
52
53static inline int v9fs_readpage_from_fscache(struct inode *inode,
54 struct page *page)
55{
56 return __v9fs_readpage_from_fscache(inode, page);
57}
58
59static inline int v9fs_readpages_from_fscache(struct inode *inode,
60 struct address_space *mapping,
61 struct list_head *pages,
62 unsigned *nr_pages)
63{
64 return __v9fs_readpages_from_fscache(inode, mapping, pages,
65 nr_pages);
66}
67
68static inline void v9fs_readpage_to_fscache(struct inode *inode,
69 struct page *page)
70{
71 if (PageFsCache(page))
72 __v9fs_readpage_to_fscache(inode, page);
73}
74
75static inline void v9fs_uncache_page(struct inode *inode, struct page *page)
76{
77 struct v9fs_inode *v9inode = V9FS_I(inode);
78 fscache_uncache_page(v9inode->fscache, page);
79 BUG_ON(PageFsCache(page));
80}
81
82static inline void v9fs_fscache_wait_on_page_write(struct inode *inode,
83 struct page *page)
84{
85 return __v9fs_fscache_wait_on_page_write(inode, page);
86}
87
88#else /* CONFIG_9P_FSCACHE */
89
90static inline void v9fs_cache_inode_get_cookie(struct inode *inode)
91{
92}
93
94static inline void v9fs_cache_inode_put_cookie(struct inode *inode)
95{
96}
97
98static inline void v9fs_cache_inode_set_cookie(struct inode *inode, struct file *file)
99{
100}
101
102static inline int v9fs_fscache_release_page(struct page *page,
103 gfp_t gfp) {
104 return 1;
105}
106
107static inline void v9fs_fscache_invalidate_page(struct page *page) {}
108
109static inline int v9fs_readpage_from_fscache(struct inode *inode,
110 struct page *page)
111{
112 return -ENOBUFS;
113}
114
115static inline int v9fs_readpages_from_fscache(struct inode *inode,
116 struct address_space *mapping,
117 struct list_head *pages,
118 unsigned *nr_pages)
119{
120 return -ENOBUFS;
121}
122
123static inline void v9fs_readpage_to_fscache(struct inode *inode,
124 struct page *page)
125{}
126
127static inline void v9fs_uncache_page(struct inode *inode, struct page *page)
128{}
129
130static inline void v9fs_fscache_wait_on_page_write(struct inode *inode,
131 struct page *page)
132{
133 return;
134}
135
136#endif /* CONFIG_9P_FSCACHE */
137#endif /* _9P_CACHE_H */