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 /*
31 * Auxiliary data attached to CIFS inode within the cache
32 */
33 struct cifs_fscache_inode_auxdata {
34 u64 last_write_time_sec;
35 u64 last_change_time_sec;
36 u32 last_write_time_nsec;
37 u32 last_change_time_nsec;
38 u64 eof;
39 };
40
41 /*
42 * cache.c
43 */
44 extern struct fscache_netfs cifs_fscache_netfs;
45 extern const struct fscache_cookie_def cifs_fscache_server_index_def;
46 extern const struct fscache_cookie_def cifs_fscache_super_index_def;
47 extern const struct fscache_cookie_def cifs_fscache_inode_object_def;
48
49 extern int cifs_fscache_register(void);
50 extern void cifs_fscache_unregister(void);
51 extern char *extract_sharename(const char *);
52
53 /*
54 * fscache.c
55 */
56 extern void cifs_fscache_get_client_cookie(struct TCP_Server_Info *);
57 extern void cifs_fscache_release_client_cookie(struct TCP_Server_Info *);
58 extern void cifs_fscache_get_super_cookie(struct cifs_tcon *);
59 extern void cifs_fscache_release_super_cookie(struct cifs_tcon *);
60
61 extern void cifs_fscache_release_inode_cookie(struct inode *);
62 extern void cifs_fscache_set_inode_cookie(struct inode *, struct file *);
63 extern void cifs_fscache_reset_inode_cookie(struct inode *);
64
65 extern void __cifs_fscache_invalidate_page(struct page *, struct inode *);
66 extern int cifs_fscache_release_page(struct page *page, gfp_t gfp);
67 extern int __cifs_readpage_from_fscache(struct inode *, struct page *);
68 extern int __cifs_readpages_from_fscache(struct inode *,
69 struct address_space *,
70 struct list_head *,
71 unsigned *);
72 extern void __cifs_fscache_readpages_cancel(struct inode *, struct list_head *);
73
74 extern void __cifs_readpage_to_fscache(struct inode *, struct page *);
75
cifs_fscache_invalidate_page(struct page * page,struct inode * inode)76 static inline void cifs_fscache_invalidate_page(struct page *page,
77 struct inode *inode)
78 {
79 if (PageFsCache(page))
80 __cifs_fscache_invalidate_page(page, inode);
81 }
82
cifs_readpage_from_fscache(struct inode * inode,struct page * page)83 static inline int cifs_readpage_from_fscache(struct inode *inode,
84 struct page *page)
85 {
86 if (CIFS_I(inode)->fscache)
87 return __cifs_readpage_from_fscache(inode, page);
88
89 return -ENOBUFS;
90 }
91
cifs_readpages_from_fscache(struct inode * inode,struct address_space * mapping,struct list_head * pages,unsigned * nr_pages)92 static inline int cifs_readpages_from_fscache(struct inode *inode,
93 struct address_space *mapping,
94 struct list_head *pages,
95 unsigned *nr_pages)
96 {
97 if (CIFS_I(inode)->fscache)
98 return __cifs_readpages_from_fscache(inode, mapping, pages,
99 nr_pages);
100 return -ENOBUFS;
101 }
102
cifs_readpage_to_fscache(struct inode * inode,struct page * page)103 static inline void cifs_readpage_to_fscache(struct inode *inode,
104 struct page *page)
105 {
106 if (PageFsCache(page))
107 __cifs_readpage_to_fscache(inode, page);
108 }
109
cifs_fscache_readpages_cancel(struct inode * inode,struct list_head * pages)110 static inline void cifs_fscache_readpages_cancel(struct inode *inode,
111 struct list_head *pages)
112 {
113 if (CIFS_I(inode)->fscache)
114 return __cifs_fscache_readpages_cancel(inode, pages);
115 }
116
117 #else /* CONFIG_CIFS_FSCACHE */
cifs_fscache_register(void)118 static inline int cifs_fscache_register(void) { return 0; }
cifs_fscache_unregister(void)119 static inline void cifs_fscache_unregister(void) {}
120
121 static inline void
cifs_fscache_get_client_cookie(struct TCP_Server_Info * server)122 cifs_fscache_get_client_cookie(struct TCP_Server_Info *server) {}
123 static inline void
cifs_fscache_release_client_cookie(struct TCP_Server_Info * server)124 cifs_fscache_release_client_cookie(struct TCP_Server_Info *server) {}
cifs_fscache_get_super_cookie(struct cifs_tcon * tcon)125 static inline void cifs_fscache_get_super_cookie(struct cifs_tcon *tcon) {}
126 static inline void
cifs_fscache_release_super_cookie(struct cifs_tcon * tcon)127 cifs_fscache_release_super_cookie(struct cifs_tcon *tcon) {}
128
cifs_fscache_release_inode_cookie(struct inode * inode)129 static inline void cifs_fscache_release_inode_cookie(struct inode *inode) {}
cifs_fscache_set_inode_cookie(struct inode * inode,struct file * filp)130 static inline void cifs_fscache_set_inode_cookie(struct inode *inode,
131 struct file *filp) {}
cifs_fscache_reset_inode_cookie(struct inode * inode)132 static inline void cifs_fscache_reset_inode_cookie(struct inode *inode) {}
cifs_fscache_release_page(struct page * page,gfp_t gfp)133 static inline int cifs_fscache_release_page(struct page *page, gfp_t gfp)
134 {
135 return 1; /* May release page */
136 }
137
cifs_fscache_invalidate_page(struct page * page,struct inode * inode)138 static inline void cifs_fscache_invalidate_page(struct page *page,
139 struct inode *inode) {}
140 static inline int
cifs_readpage_from_fscache(struct inode * inode,struct page * page)141 cifs_readpage_from_fscache(struct inode *inode, struct page *page)
142 {
143 return -ENOBUFS;
144 }
145
cifs_readpages_from_fscache(struct inode * inode,struct address_space * mapping,struct list_head * pages,unsigned * nr_pages)146 static inline int cifs_readpages_from_fscache(struct inode *inode,
147 struct address_space *mapping,
148 struct list_head *pages,
149 unsigned *nr_pages)
150 {
151 return -ENOBUFS;
152 }
153
cifs_readpage_to_fscache(struct inode * inode,struct page * page)154 static inline void cifs_readpage_to_fscache(struct inode *inode,
155 struct page *page) {}
156
cifs_fscache_readpages_cancel(struct inode * inode,struct list_head * pages)157 static inline void cifs_fscache_readpages_cancel(struct inode *inode,
158 struct list_head *pages)
159 {
160 }
161
162 #endif /* CONFIG_CIFS_FSCACHE */
163
164 #endif /* _CIFS_FSCACHE_H */
165