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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 | ||
58659854 SF |
30 | /* |
31 | * Auxiliary data attached to CIFS superblock within the cache | |
32 | */ | |
33 | struct cifs_fscache_super_auxdata { | |
34 | u64 resource_id; /* unique server resource id */ | |
35 | __le64 vol_create_time; | |
36 | u32 vol_serial_number; | |
37 | } __packed; | |
38 | ||
402cb8dd DH |
39 | /* |
40 | * Auxiliary data attached to CIFS inode within the cache | |
41 | */ | |
42 | struct cifs_fscache_inode_auxdata { | |
cbedeadf AB |
43 | u64 last_write_time_sec; |
44 | u64 last_change_time_sec; | |
45 | u32 last_write_time_nsec; | |
46 | u32 last_change_time_nsec; | |
47 | u64 eof; | |
402cb8dd DH |
48 | }; |
49 | ||
50 | /* | |
51 | * cache.c | |
52 | */ | |
f579cf3c | 53 | extern struct fscache_netfs cifs_fscache_netfs; |
488f1d2d | 54 | extern const struct fscache_cookie_def cifs_fscache_server_index_def; |
d03382ce | 55 | extern const struct fscache_cookie_def cifs_fscache_super_index_def; |
9451a9a5 SJ |
56 | extern const struct fscache_cookie_def cifs_fscache_inode_object_def; |
57 | ||
f579cf3c SJ |
58 | extern int cifs_fscache_register(void); |
59 | extern void cifs_fscache_unregister(void); | |
60 | ||
488f1d2d SJ |
61 | /* |
62 | * fscache.c | |
63 | */ | |
64 | extern void cifs_fscache_get_client_cookie(struct TCP_Server_Info *); | |
65 | extern void cifs_fscache_release_client_cookie(struct TCP_Server_Info *); | |
96daf2b0 SF |
66 | extern void cifs_fscache_get_super_cookie(struct cifs_tcon *); |
67 | extern void cifs_fscache_release_super_cookie(struct cifs_tcon *); | |
488f1d2d | 68 | |
9451a9a5 SJ |
69 | extern void cifs_fscache_release_inode_cookie(struct inode *); |
70 | extern void cifs_fscache_set_inode_cookie(struct inode *, struct file *); | |
71 | extern void cifs_fscache_reset_inode_cookie(struct inode *); | |
72 | ||
85f2d6b4 SJ |
73 | extern void __cifs_fscache_invalidate_page(struct page *, struct inode *); |
74 | extern int cifs_fscache_release_page(struct page *page, gfp_t gfp); | |
56698236 SJ |
75 | extern int __cifs_readpage_from_fscache(struct inode *, struct page *); |
76 | extern int __cifs_readpages_from_fscache(struct inode *, | |
77 | struct address_space *, | |
78 | struct list_head *, | |
79 | unsigned *); | |
54afa990 | 80 | extern void __cifs_fscache_readpages_cancel(struct inode *, struct list_head *); |
85f2d6b4 | 81 | |
9dc06558 SJ |
82 | extern void __cifs_readpage_to_fscache(struct inode *, struct page *); |
83 | ||
85f2d6b4 SJ |
84 | static inline void cifs_fscache_invalidate_page(struct page *page, |
85 | struct inode *inode) | |
86 | { | |
87 | if (PageFsCache(page)) | |
88 | __cifs_fscache_invalidate_page(page, inode); | |
89 | } | |
90 | ||
56698236 SJ |
91 | static inline int cifs_readpage_from_fscache(struct inode *inode, |
92 | struct page *page) | |
93 | { | |
94 | if (CIFS_I(inode)->fscache) | |
95 | return __cifs_readpage_from_fscache(inode, page); | |
96 | ||
97 | return -ENOBUFS; | |
98 | } | |
99 | ||
100 | static inline int cifs_readpages_from_fscache(struct inode *inode, | |
101 | struct address_space *mapping, | |
102 | struct list_head *pages, | |
103 | unsigned *nr_pages) | |
104 | { | |
105 | if (CIFS_I(inode)->fscache) | |
106 | return __cifs_readpages_from_fscache(inode, mapping, pages, | |
107 | nr_pages); | |
108 | return -ENOBUFS; | |
109 | } | |
110 | ||
9dc06558 SJ |
111 | static inline void cifs_readpage_to_fscache(struct inode *inode, |
112 | struct page *page) | |
113 | { | |
114 | if (PageFsCache(page)) | |
115 | __cifs_readpage_to_fscache(inode, page); | |
116 | } | |
117 | ||
54afa990 DH |
118 | static inline void cifs_fscache_readpages_cancel(struct inode *inode, |
119 | struct list_head *pages) | |
120 | { | |
121 | if (CIFS_I(inode)->fscache) | |
122 | return __cifs_fscache_readpages_cancel(inode, pages); | |
123 | } | |
124 | ||
f579cf3c SJ |
125 | #else /* CONFIG_CIFS_FSCACHE */ |
126 | static inline int cifs_fscache_register(void) { return 0; } | |
127 | static inline void cifs_fscache_unregister(void) {} | |
128 | ||
488f1d2d SJ |
129 | static inline void |
130 | cifs_fscache_get_client_cookie(struct TCP_Server_Info *server) {} | |
131 | static inline void | |
c5e04a3e | 132 | cifs_fscache_release_client_cookie(struct TCP_Server_Info *server) {} |
96daf2b0 | 133 | static inline void cifs_fscache_get_super_cookie(struct cifs_tcon *tcon) {} |
d03382ce | 134 | static inline void |
96daf2b0 | 135 | cifs_fscache_release_super_cookie(struct cifs_tcon *tcon) {} |
488f1d2d | 136 | |
9451a9a5 SJ |
137 | static inline void cifs_fscache_release_inode_cookie(struct inode *inode) {} |
138 | static inline void cifs_fscache_set_inode_cookie(struct inode *inode, | |
139 | struct file *filp) {} | |
140 | static inline void cifs_fscache_reset_inode_cookie(struct inode *inode) {} | |
d0e6f44e | 141 | static inline int cifs_fscache_release_page(struct page *page, gfp_t gfp) |
85f2d6b4 SJ |
142 | { |
143 | return 1; /* May release page */ | |
144 | } | |
9451a9a5 | 145 | |
d0e6f44e SF |
146 | static inline void cifs_fscache_invalidate_page(struct page *page, |
147 | struct inode *inode) {} | |
56698236 SJ |
148 | static inline int |
149 | cifs_readpage_from_fscache(struct inode *inode, struct page *page) | |
150 | { | |
151 | return -ENOBUFS; | |
152 | } | |
153 | ||
154 | static inline int cifs_readpages_from_fscache(struct inode *inode, | |
155 | struct address_space *mapping, | |
156 | struct list_head *pages, | |
157 | unsigned *nr_pages) | |
158 | { | |
159 | return -ENOBUFS; | |
160 | } | |
161 | ||
9dc06558 SJ |
162 | static inline void cifs_readpage_to_fscache(struct inode *inode, |
163 | struct page *page) {} | |
9451a9a5 | 164 | |
54afa990 DH |
165 | static inline void cifs_fscache_readpages_cancel(struct inode *inode, |
166 | struct list_head *pages) | |
167 | { | |
168 | } | |
169 | ||
f579cf3c SJ |
170 | #endif /* CONFIG_CIFS_FSCACHE */ |
171 | ||
172 | #endif /* _CIFS_FSCACHE_H */ |