2 * fs/cifs/fscache.h - CIFS filesystem cache interface definitions
4 * Copyright (c) 2010 Novell, Inc.
5 * Authors(s): Suresh Jayaraman (sjayaraman@suse.de>
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.
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.
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
21 #ifndef _CIFS_FSCACHE_H
22 #define _CIFS_FSCACHE_H
24 #include <linux/fscache.h>
28 #ifdef CONFIG_CIFS_FSCACHE
31 * Auxiliary data attached to CIFS inode within the cache
33 struct cifs_fscache_inode_auxdata {
34 struct timespec last_write_time;
35 struct timespec last_change_time;
42 extern struct fscache_netfs cifs_fscache_netfs;
43 extern const struct fscache_cookie_def cifs_fscache_server_index_def;
44 extern const struct fscache_cookie_def cifs_fscache_super_index_def;
45 extern const struct fscache_cookie_def cifs_fscache_inode_object_def;
47 extern int cifs_fscache_register(void);
48 extern void cifs_fscache_unregister(void);
49 extern char *extract_sharename(const char *);
54 extern void cifs_fscache_get_client_cookie(struct TCP_Server_Info *);
55 extern void cifs_fscache_release_client_cookie(struct TCP_Server_Info *);
56 extern void cifs_fscache_get_super_cookie(struct cifs_tcon *);
57 extern void cifs_fscache_release_super_cookie(struct cifs_tcon *);
59 extern void cifs_fscache_release_inode_cookie(struct inode *);
60 extern void cifs_fscache_set_inode_cookie(struct inode *, struct file *);
61 extern void cifs_fscache_reset_inode_cookie(struct inode *);
63 extern void __cifs_fscache_invalidate_page(struct page *, struct inode *);
64 extern int cifs_fscache_release_page(struct page *page, gfp_t gfp);
65 extern int __cifs_readpage_from_fscache(struct inode *, struct page *);
66 extern int __cifs_readpages_from_fscache(struct inode *,
67 struct address_space *,
70 extern void __cifs_fscache_readpages_cancel(struct inode *, struct list_head *);
72 extern void __cifs_readpage_to_fscache(struct inode *, struct page *);
74 static inline void cifs_fscache_invalidate_page(struct page *page,
77 if (PageFsCache(page))
78 __cifs_fscache_invalidate_page(page, inode);
81 static inline int cifs_readpage_from_fscache(struct inode *inode,
84 if (CIFS_I(inode)->fscache)
85 return __cifs_readpage_from_fscache(inode, page);
90 static inline int cifs_readpages_from_fscache(struct inode *inode,
91 struct address_space *mapping,
92 struct list_head *pages,
95 if (CIFS_I(inode)->fscache)
96 return __cifs_readpages_from_fscache(inode, mapping, pages,
101 static inline void cifs_readpage_to_fscache(struct inode *inode,
104 if (PageFsCache(page))
105 __cifs_readpage_to_fscache(inode, page);
108 static inline void cifs_fscache_readpages_cancel(struct inode *inode,
109 struct list_head *pages)
111 if (CIFS_I(inode)->fscache)
112 return __cifs_fscache_readpages_cancel(inode, pages);
115 #else /* CONFIG_CIFS_FSCACHE */
116 static inline int cifs_fscache_register(void) { return 0; }
117 static inline void cifs_fscache_unregister(void) {}
120 cifs_fscache_get_client_cookie(struct TCP_Server_Info *server) {}
122 cifs_fscache_release_client_cookie(struct TCP_Server_Info *server) {}
123 static inline void cifs_fscache_get_super_cookie(struct cifs_tcon *tcon) {}
125 cifs_fscache_release_super_cookie(struct cifs_tcon *tcon) {}
127 static inline void cifs_fscache_release_inode_cookie(struct inode *inode) {}
128 static inline void cifs_fscache_set_inode_cookie(struct inode *inode,
129 struct file *filp) {}
130 static inline void cifs_fscache_reset_inode_cookie(struct inode *inode) {}
131 static inline int cifs_fscache_release_page(struct page *page, gfp_t gfp)
133 return 1; /* May release page */
136 static inline void cifs_fscache_invalidate_page(struct page *page,
137 struct inode *inode) {}
139 cifs_readpage_from_fscache(struct inode *inode, struct page *page)
144 static inline int cifs_readpages_from_fscache(struct inode *inode,
145 struct address_space *mapping,
146 struct list_head *pages,
152 static inline void cifs_readpage_to_fscache(struct inode *inode,
153 struct page *page) {}
155 static inline void cifs_fscache_readpages_cancel(struct inode *inode,
156 struct list_head *pages)
160 #endif /* CONFIG_CIFS_FSCACHE */
162 #endif /* _CIFS_FSCACHE_H */