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 cifsTconInfo *);
44 extern void cifs_fscache_release_super_cookie(struct cifsTconInfo *);
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
58 extern void __cifs_readpage_to_fscache(struct inode *, struct page *);
59
cifs_fscache_invalidate_page(struct page * page,struct inode * inode)60 static inline void cifs_fscache_invalidate_page(struct page *page,
61 struct inode *inode)
62 {
63 if (PageFsCache(page))
64 __cifs_fscache_invalidate_page(page, inode);
65 }
66
cifs_readpage_from_fscache(struct inode * inode,struct page * page)67 static inline int cifs_readpage_from_fscache(struct inode *inode,
68 struct page *page)
69 {
70 if (CIFS_I(inode)->fscache)
71 return __cifs_readpage_from_fscache(inode, page);
72
73 return -ENOBUFS;
74 }
75
cifs_readpages_from_fscache(struct inode * inode,struct address_space * mapping,struct list_head * pages,unsigned * nr_pages)76 static inline int cifs_readpages_from_fscache(struct inode *inode,
77 struct address_space *mapping,
78 struct list_head *pages,
79 unsigned *nr_pages)
80 {
81 if (CIFS_I(inode)->fscache)
82 return __cifs_readpages_from_fscache(inode, mapping, pages,
83 nr_pages);
84 return -ENOBUFS;
85 }
86
cifs_readpage_to_fscache(struct inode * inode,struct page * page)87 static inline void cifs_readpage_to_fscache(struct inode *inode,
88 struct page *page)
89 {
90 if (PageFsCache(page))
91 __cifs_readpage_to_fscache(inode, page);
92 }
93
94 #else /* CONFIG_CIFS_FSCACHE */
cifs_fscache_register(void)95 static inline int cifs_fscache_register(void) { return 0; }
cifs_fscache_unregister(void)96 static inline void cifs_fscache_unregister(void) {}
97
98 static inline void
cifs_fscache_get_client_cookie(struct TCP_Server_Info * server)99 cifs_fscache_get_client_cookie(struct TCP_Server_Info *server) {}
100 static inline void
cifs_fscache_release_client_cookie(struct TCP_Server_Info * server)101 cifs_fscache_release_client_cookie(struct TCP_Server_Info *server) {}
cifs_fscache_get_super_cookie(struct cifsTconInfo * tcon)102 static inline void cifs_fscache_get_super_cookie(struct cifsTconInfo *tcon) {}
103 static inline void
cifs_fscache_release_super_cookie(struct cifsTconInfo * tcon)104 cifs_fscache_release_super_cookie(struct cifsTconInfo *tcon) {}
105
cifs_fscache_release_inode_cookie(struct inode * inode)106 static inline void cifs_fscache_release_inode_cookie(struct inode *inode) {}
cifs_fscache_set_inode_cookie(struct inode * inode,struct file * filp)107 static inline void cifs_fscache_set_inode_cookie(struct inode *inode,
108 struct file *filp) {}
cifs_fscache_reset_inode_cookie(struct inode * inode)109 static inline void cifs_fscache_reset_inode_cookie(struct inode *inode) {}
cifs_fscache_release_page(struct page * page,gfp_t gfp)110 static inline int cifs_fscache_release_page(struct page *page, gfp_t gfp)
111 {
112 return 1; /* May release page */
113 }
114
cifs_fscache_invalidate_page(struct page * page,struct inode * inode)115 static inline void cifs_fscache_invalidate_page(struct page *page,
116 struct inode *inode) {}
117 static inline int
cifs_readpage_from_fscache(struct inode * inode,struct page * page)118 cifs_readpage_from_fscache(struct inode *inode, struct page *page)
119 {
120 return -ENOBUFS;
121 }
122
cifs_readpages_from_fscache(struct inode * inode,struct address_space * mapping,struct list_head * pages,unsigned * nr_pages)123 static inline int cifs_readpages_from_fscache(struct inode *inode,
124 struct address_space *mapping,
125 struct list_head *pages,
126 unsigned *nr_pages)
127 {
128 return -ENOBUFS;
129 }
130
cifs_readpage_to_fscache(struct inode * inode,struct page * page)131 static inline void cifs_readpage_to_fscache(struct inode *inode,
132 struct page *page) {}
133
134 #endif /* CONFIG_CIFS_FSCACHE */
135
136 #endif /* _CIFS_FSCACHE_H */
137