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f579cf3c SJ |
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 | ||
488f1d2d SJ |
26 | #include "cifsglob.h" |
27 | ||
f579cf3c SJ |
28 | #ifdef CONFIG_CIFS_FSCACHE |
29 | ||
402cb8dd DH |
30 | /* |
31 | * Auxiliary data attached to CIFS inode within the cache | |
32 | */ | |
33 | struct cifs_fscache_inode_auxdata { | |
34 | struct timespec last_write_time; | |
35 | struct timespec last_change_time; | |
36 | u64 eof; | |
37 | }; | |
38 | ||
39 | /* | |
40 | * cache.c | |
41 | */ | |
f579cf3c | 42 | extern struct fscache_netfs cifs_fscache_netfs; |
488f1d2d | 43 | extern const struct fscache_cookie_def cifs_fscache_server_index_def; |
d03382ce | 44 | extern const struct fscache_cookie_def cifs_fscache_super_index_def; |
9451a9a5 SJ |
45 | extern const struct fscache_cookie_def cifs_fscache_inode_object_def; |
46 | ||
f579cf3c SJ |
47 | extern int cifs_fscache_register(void); |
48 | extern void cifs_fscache_unregister(void); | |
402cb8dd | 49 | extern char *extract_sharename(const char *); |
f579cf3c | 50 | |
488f1d2d SJ |
51 | /* |
52 | * fscache.c | |
53 | */ | |
54 | extern void cifs_fscache_get_client_cookie(struct TCP_Server_Info *); | |
55 | extern void cifs_fscache_release_client_cookie(struct TCP_Server_Info *); | |
96daf2b0 SF |
56 | extern void cifs_fscache_get_super_cookie(struct cifs_tcon *); |
57 | extern void cifs_fscache_release_super_cookie(struct cifs_tcon *); | |
488f1d2d | 58 | |
9451a9a5 SJ |
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 *); | |
62 | ||
85f2d6b4 SJ |
63 | extern void __cifs_fscache_invalidate_page(struct page *, struct inode *); |
64 | extern int cifs_fscache_release_page(struct page *page, gfp_t gfp); | |
56698236 SJ |
65 | extern int __cifs_readpage_from_fscache(struct inode *, struct page *); |
66 | extern int __cifs_readpages_from_fscache(struct inode *, | |
67 | struct address_space *, | |
68 | struct list_head *, | |
69 | unsigned *); | |
54afa990 | 70 | extern void __cifs_fscache_readpages_cancel(struct inode *, struct list_head *); |
85f2d6b4 | 71 | |
9dc06558 SJ |
72 | extern void __cifs_readpage_to_fscache(struct inode *, struct page *); |
73 | ||
85f2d6b4 SJ |
74 | static inline void cifs_fscache_invalidate_page(struct page *page, |
75 | struct inode *inode) | |
76 | { | |
77 | if (PageFsCache(page)) | |
78 | __cifs_fscache_invalidate_page(page, inode); | |
79 | } | |
80 | ||
56698236 SJ |
81 | static inline int cifs_readpage_from_fscache(struct inode *inode, |
82 | struct page *page) | |
83 | { | |
84 | if (CIFS_I(inode)->fscache) | |
85 | return __cifs_readpage_from_fscache(inode, page); | |
86 | ||
87 | return -ENOBUFS; | |
88 | } | |
89 | ||
90 | static inline int cifs_readpages_from_fscache(struct inode *inode, | |
91 | struct address_space *mapping, | |
92 | struct list_head *pages, | |
93 | unsigned *nr_pages) | |
94 | { | |
95 | if (CIFS_I(inode)->fscache) | |
96 | return __cifs_readpages_from_fscache(inode, mapping, pages, | |
97 | nr_pages); | |
98 | return -ENOBUFS; | |
99 | } | |
100 | ||
9dc06558 SJ |
101 | static inline void cifs_readpage_to_fscache(struct inode *inode, |
102 | struct page *page) | |
103 | { | |
104 | if (PageFsCache(page)) | |
105 | __cifs_readpage_to_fscache(inode, page); | |
106 | } | |
107 | ||
54afa990 DH |
108 | static inline void cifs_fscache_readpages_cancel(struct inode *inode, |
109 | struct list_head *pages) | |
110 | { | |
111 | if (CIFS_I(inode)->fscache) | |
112 | return __cifs_fscache_readpages_cancel(inode, pages); | |
113 | } | |
114 | ||
f579cf3c SJ |
115 | #else /* CONFIG_CIFS_FSCACHE */ |
116 | static inline int cifs_fscache_register(void) { return 0; } | |
117 | static inline void cifs_fscache_unregister(void) {} | |
118 | ||
488f1d2d SJ |
119 | static inline void |
120 | cifs_fscache_get_client_cookie(struct TCP_Server_Info *server) {} | |
121 | static inline void | |
c5e04a3e | 122 | cifs_fscache_release_client_cookie(struct TCP_Server_Info *server) {} |
96daf2b0 | 123 | static inline void cifs_fscache_get_super_cookie(struct cifs_tcon *tcon) {} |
d03382ce | 124 | static inline void |
96daf2b0 | 125 | cifs_fscache_release_super_cookie(struct cifs_tcon *tcon) {} |
488f1d2d | 126 | |
9451a9a5 SJ |
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) {} | |
d0e6f44e | 131 | static inline int cifs_fscache_release_page(struct page *page, gfp_t gfp) |
85f2d6b4 SJ |
132 | { |
133 | return 1; /* May release page */ | |
134 | } | |
9451a9a5 | 135 | |
d0e6f44e SF |
136 | static inline void cifs_fscache_invalidate_page(struct page *page, |
137 | struct inode *inode) {} | |
56698236 SJ |
138 | static inline int |
139 | cifs_readpage_from_fscache(struct inode *inode, struct page *page) | |
140 | { | |
141 | return -ENOBUFS; | |
142 | } | |
143 | ||
144 | static inline int cifs_readpages_from_fscache(struct inode *inode, | |
145 | struct address_space *mapping, | |
146 | struct list_head *pages, | |
147 | unsigned *nr_pages) | |
148 | { | |
149 | return -ENOBUFS; | |
150 | } | |
151 | ||
9dc06558 SJ |
152 | static inline void cifs_readpage_to_fscache(struct inode *inode, |
153 | struct page *page) {} | |
9451a9a5 | 154 | |
54afa990 DH |
155 | static inline void cifs_fscache_readpages_cancel(struct inode *inode, |
156 | struct list_head *pages) | |
157 | { | |
158 | } | |
159 | ||
f579cf3c SJ |
160 | #endif /* CONFIG_CIFS_FSCACHE */ |
161 | ||
162 | #endif /* _CIFS_FSCACHE_H */ |