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fscache.h
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1 /*
2  * fs/cifs/fscache.h - CIFS filesystem cache interface definitions
3  *
4  * Copyright (c) 2010 Novell, Inc.
5  * Authors(s): Suresh Jayaraman ([email protected]>
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;
34 
35 extern int cifs_fscache_register(void);
36 extern void cifs_fscache_unregister(void);
37 
38 /*
39  * fscache.c
40  */
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 
58 extern void __cifs_readpage_to_fscache(struct inode *, struct page *);
59 
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 
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 
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 
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 */
95 static inline int cifs_fscache_register(void) { return 0; }
96 static inline void cifs_fscache_unregister(void) {}
97 
98 static inline void
100 static inline void
102 static inline void cifs_fscache_get_super_cookie(struct cifs_tcon *tcon) {}
103 static inline void
105 
106 static inline void cifs_fscache_release_inode_cookie(struct inode *inode) {}
107 static inline void cifs_fscache_set_inode_cookie(struct inode *inode,
108  struct file *filp) {}
109 static inline void cifs_fscache_reset_inode_cookie(struct inode *inode) {}
110 static inline int cifs_fscache_release_page(struct page *page, gfp_t gfp)
111 {
112  return 1; /* May release page */
113 }
114 
115 static inline void cifs_fscache_invalidate_page(struct page *page,
116  struct inode *inode) {}
117 static inline int
118 cifs_readpage_from_fscache(struct inode *inode, struct page *page)
119 {
120  return -ENOBUFS;
121 }
122 
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 
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 */