1 /*
2 * fs/cifs/fscache.h - CIFS filesystem cache interface definitions
3 *
4 * Copyright (c) 2010 Novell, Inc.
5 * Authors(s): Suresh Jayaraman (sjayaraman@suse.de>
6 *
7 * This library is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU Lesser General Public License as published
9 * by the Free Software Foundation; either version 2.1 of the License, or
10 * (at your option) any later version.
11 *
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
15 * the GNU Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public License
18 * along with this library; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 */
21 #ifndef _CIFS_FSCACHE_H
22 #define _CIFS_FSCACHE_H
23
24 #include <linux/fscache.h>
25
26 #include "cifsglob.h"
27
28 #ifdef CONFIG_CIFS_FSCACHE
29
30 extern struct fscache_netfs cifs_fscache_netfs;
31 extern const struct fscache_cookie_def cifs_fscache_server_index_def;
32 extern const struct fscache_cookie_def cifs_fscache_super_index_def;
33 extern const struct fscache_cookie_def cifs_fscache_inode_object_def;
34
35 extern int cifs_fscache_register(void);
36 extern void cifs_fscache_unregister(void);
37
38 /*
39 * fscache.c
40 */
41 extern void cifs_fscache_get_client_cookie(struct TCP_Server_Info *);
42 extern void cifs_fscache_release_client_cookie(struct TCP_Server_Info *);
43 extern void cifs_fscache_get_super_cookie(struct cifs_tcon *);
44 extern void cifs_fscache_release_super_cookie(struct cifs_tcon *);
45
46 extern void cifs_fscache_release_inode_cookie(struct inode *);
47 extern void cifs_fscache_set_inode_cookie(struct inode *, struct file *);
48 extern void cifs_fscache_reset_inode_cookie(struct inode *);
49
50 extern void __cifs_fscache_invalidate_page(struct page *, struct inode *);
51 extern int cifs_fscache_release_page(struct page *page, gfp_t gfp);
52 extern int __cifs_readpage_from_fscache(struct inode *, struct page *);
53 extern int __cifs_readpages_from_fscache(struct inode *,
54 struct address_space *,
55 struct list_head *,
56 unsigned *);
57 extern void __cifs_fscache_readpages_cancel(struct inode *, struct list_head *);
58
59 extern void __cifs_readpage_to_fscache(struct inode *, struct page *);
60
cifs_fscache_invalidate_page(struct page * page,struct inode * inode)61 static inline void cifs_fscache_invalidate_page(struct page *page,
62 struct inode *inode)
63 {
64 if (PageFsCache(page))
65 __cifs_fscache_invalidate_page(page, inode);
66 }
67
cifs_readpage_from_fscache(struct inode * inode,struct page * page)68 static inline int cifs_readpage_from_fscache(struct inode *inode,
69 struct page *page)
70 {
71 if (CIFS_I(inode)->fscache)
72 return __cifs_readpage_from_fscache(inode, page);
73
74 return -ENOBUFS;
75 }
76
cifs_readpages_from_fscache(struct inode * inode,struct address_space * mapping,struct list_head * pages,unsigned * nr_pages)77 static inline int cifs_readpages_from_fscache(struct inode *inode,
78 struct address_space *mapping,
79 struct list_head *pages,
80 unsigned *nr_pages)
81 {
82 if (CIFS_I(inode)->fscache)
83 return __cifs_readpages_from_fscache(inode, mapping, pages,
84 nr_pages);
85 return -ENOBUFS;
86 }
87
cifs_readpage_to_fscache(struct inode * inode,struct page * page)88 static inline void cifs_readpage_to_fscache(struct inode *inode,
89 struct page *page)
90 {
91 if (PageFsCache(page))
92 __cifs_readpage_to_fscache(inode, page);
93 }
94
cifs_fscache_readpages_cancel(struct inode * inode,struct list_head * pages)95 static inline void cifs_fscache_readpages_cancel(struct inode *inode,
96 struct list_head *pages)
97 {
98 if (CIFS_I(inode)->fscache)
99 return __cifs_fscache_readpages_cancel(inode, pages);
100 }
101
102 #else /* CONFIG_CIFS_FSCACHE */
cifs_fscache_register(void)103 static inline int cifs_fscache_register(void) { return 0; }
cifs_fscache_unregister(void)104 static inline void cifs_fscache_unregister(void) {}
105
106 static inline void
cifs_fscache_get_client_cookie(struct TCP_Server_Info * server)107 cifs_fscache_get_client_cookie(struct TCP_Server_Info *server) {}
108 static inline void
cifs_fscache_release_client_cookie(struct TCP_Server_Info * server)109 cifs_fscache_release_client_cookie(struct TCP_Server_Info *server) {}
cifs_fscache_get_super_cookie(struct cifs_tcon * tcon)110 static inline void cifs_fscache_get_super_cookie(struct cifs_tcon *tcon) {}
111 static inline void
cifs_fscache_release_super_cookie(struct cifs_tcon * tcon)112 cifs_fscache_release_super_cookie(struct cifs_tcon *tcon) {}
113
cifs_fscache_release_inode_cookie(struct inode * inode)114 static inline void cifs_fscache_release_inode_cookie(struct inode *inode) {}
cifs_fscache_set_inode_cookie(struct inode * inode,struct file * filp)115 static inline void cifs_fscache_set_inode_cookie(struct inode *inode,
116 struct file *filp) {}
cifs_fscache_reset_inode_cookie(struct inode * inode)117 static inline void cifs_fscache_reset_inode_cookie(struct inode *inode) {}
cifs_fscache_release_page(struct page * page,gfp_t gfp)118 static inline int cifs_fscache_release_page(struct page *page, gfp_t gfp)
119 {
120 return 1; /* May release page */
121 }
122
cifs_fscache_invalidate_page(struct page * page,struct inode * inode)123 static inline void cifs_fscache_invalidate_page(struct page *page,
124 struct inode *inode) {}
125 static inline int
cifs_readpage_from_fscache(struct inode * inode,struct page * page)126 cifs_readpage_from_fscache(struct inode *inode, struct page *page)
127 {
128 return -ENOBUFS;
129 }
130
cifs_readpages_from_fscache(struct inode * inode,struct address_space * mapping,struct list_head * pages,unsigned * nr_pages)131 static inline int cifs_readpages_from_fscache(struct inode *inode,
132 struct address_space *mapping,
133 struct list_head *pages,
134 unsigned *nr_pages)
135 {
136 return -ENOBUFS;
137 }
138
cifs_readpage_to_fscache(struct inode * inode,struct page * page)139 static inline void cifs_readpage_to_fscache(struct inode *inode,
140 struct page *page) {}
141
cifs_fscache_readpages_cancel(struct inode * inode,struct list_head * pages)142 static inline void cifs_fscache_readpages_cancel(struct inode *inode,
143 struct list_head *pages)
144 {
145 }
146
147 #endif /* CONFIG_CIFS_FSCACHE */
148
149 #endif /* _CIFS_FSCACHE_H */
150