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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 (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
30extern struct fscache_netfs cifs_fscache_netfs;
31extern const struct fscache_cookie_def cifs_fscache_server_index_def;
32extern const struct fscache_cookie_def cifs_fscache_super_index_def;
33extern const struct fscache_cookie_def cifs_fscache_inode_object_def;
34
35extern int cifs_fscache_register(void);
36extern void cifs_fscache_unregister(void);
37
38/*
39 * fscache.c
40 */
41extern void cifs_fscache_get_client_cookie(struct TCP_Server_Info *);
42extern void cifs_fscache_release_client_cookie(struct TCP_Server_Info *);
43extern void cifs_fscache_get_super_cookie(struct cifs_tcon *);
44extern void cifs_fscache_release_super_cookie(struct cifs_tcon *);
45
46extern void cifs_fscache_release_inode_cookie(struct inode *);
47extern void cifs_fscache_set_inode_cookie(struct inode *, struct file *);
48extern void cifs_fscache_reset_inode_cookie(struct inode *);
49
50extern void __cifs_fscache_invalidate_page(struct page *, struct inode *);
51extern int cifs_fscache_release_page(struct page *page, gfp_t gfp);
52extern int __cifs_readpage_from_fscache(struct inode *, struct page *);
53extern int __cifs_readpages_from_fscache(struct inode *,
54 struct address_space *,
55 struct list_head *,
56 unsigned *);
57
58extern void __cifs_readpage_to_fscache(struct inode *, struct page *);
59
60static 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
67static 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
76static 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
87static 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 */
95static inline int cifs_fscache_register(void) { return 0; }
96static inline void cifs_fscache_unregister(void) {}
97
98static inline void
99cifs_fscache_get_client_cookie(struct TCP_Server_Info *server) {}
100static inline void
101cifs_fscache_release_client_cookie(struct TCP_Server_Info *server) {}
102static inline void cifs_fscache_get_super_cookie(struct cifs_tcon *tcon) {}
103static inline void
104cifs_fscache_release_super_cookie(struct cifs_tcon *tcon) {}
105
106static inline void cifs_fscache_release_inode_cookie(struct inode *inode) {}
107static inline void cifs_fscache_set_inode_cookie(struct inode *inode,
108 struct file *filp) {}
109static inline void cifs_fscache_reset_inode_cookie(struct inode *inode) {}
110static inline int cifs_fscache_release_page(struct page *page, gfp_t gfp)
111{
112 return 1; /* May release page */
113}
114
115static inline void cifs_fscache_invalidate_page(struct page *page,
116 struct inode *inode) {}
117static inline int
118cifs_readpage_from_fscache(struct inode *inode, struct page *page)
119{
120 return -ENOBUFS;
121}
122
123static 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
131static 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 */
1/* SPDX-License-Identifier: LGPL-2.1 */
2/*
3 * fs/cifs/fscache.h - CIFS filesystem cache interface definitions
4 *
5 * Copyright (c) 2010 Novell, Inc.
6 * Authors(s): Suresh Jayaraman (sjayaraman@suse.de>
7 *
8 */
9#ifndef _CIFS_FSCACHE_H
10#define _CIFS_FSCACHE_H
11
12#include <linux/fscache.h>
13
14#include "cifsglob.h"
15
16#ifdef CONFIG_CIFS_FSCACHE
17
18/*
19 * Auxiliary data attached to CIFS superblock within the cache
20 */
21struct cifs_fscache_super_auxdata {
22 u64 resource_id; /* unique server resource id */
23 __le64 vol_create_time;
24 u32 vol_serial_number;
25} __packed;
26
27/*
28 * Auxiliary data attached to CIFS inode within the cache
29 */
30struct cifs_fscache_inode_auxdata {
31 u64 last_write_time_sec;
32 u64 last_change_time_sec;
33 u32 last_write_time_nsec;
34 u32 last_change_time_nsec;
35 u64 eof;
36};
37
38/*
39 * cache.c
40 */
41extern struct fscache_netfs cifs_fscache_netfs;
42extern const struct fscache_cookie_def cifs_fscache_server_index_def;
43extern const struct fscache_cookie_def cifs_fscache_super_index_def;
44extern const struct fscache_cookie_def cifs_fscache_inode_object_def;
45
46extern int cifs_fscache_register(void);
47extern void cifs_fscache_unregister(void);
48
49/*
50 * fscache.c
51 */
52extern void cifs_fscache_get_client_cookie(struct TCP_Server_Info *);
53extern void cifs_fscache_release_client_cookie(struct TCP_Server_Info *);
54extern void cifs_fscache_get_super_cookie(struct cifs_tcon *);
55extern void cifs_fscache_release_super_cookie(struct cifs_tcon *);
56
57extern void cifs_fscache_release_inode_cookie(struct inode *);
58extern void cifs_fscache_set_inode_cookie(struct inode *, struct file *);
59extern void cifs_fscache_reset_inode_cookie(struct inode *);
60
61extern void __cifs_fscache_invalidate_page(struct page *, struct inode *);
62extern int cifs_fscache_release_page(struct page *page, gfp_t gfp);
63extern int __cifs_readpage_from_fscache(struct inode *, struct page *);
64extern int __cifs_readpages_from_fscache(struct inode *,
65 struct address_space *,
66 struct list_head *,
67 unsigned *);
68extern void __cifs_fscache_readpages_cancel(struct inode *, struct list_head *);
69
70extern void __cifs_readpage_to_fscache(struct inode *, struct page *);
71
72static inline void cifs_fscache_invalidate_page(struct page *page,
73 struct inode *inode)
74{
75 if (PageFsCache(page))
76 __cifs_fscache_invalidate_page(page, inode);
77}
78
79static inline int cifs_readpage_from_fscache(struct inode *inode,
80 struct page *page)
81{
82 if (CIFS_I(inode)->fscache)
83 return __cifs_readpage_from_fscache(inode, page);
84
85 return -ENOBUFS;
86}
87
88static inline int cifs_readpages_from_fscache(struct inode *inode,
89 struct address_space *mapping,
90 struct list_head *pages,
91 unsigned *nr_pages)
92{
93 if (CIFS_I(inode)->fscache)
94 return __cifs_readpages_from_fscache(inode, mapping, pages,
95 nr_pages);
96 return -ENOBUFS;
97}
98
99static inline void cifs_readpage_to_fscache(struct inode *inode,
100 struct page *page)
101{
102 if (PageFsCache(page))
103 __cifs_readpage_to_fscache(inode, page);
104}
105
106static inline void cifs_fscache_readpages_cancel(struct inode *inode,
107 struct list_head *pages)
108{
109 if (CIFS_I(inode)->fscache)
110 return __cifs_fscache_readpages_cancel(inode, pages);
111}
112
113#else /* CONFIG_CIFS_FSCACHE */
114static inline int cifs_fscache_register(void) { return 0; }
115static inline void cifs_fscache_unregister(void) {}
116
117static inline void
118cifs_fscache_get_client_cookie(struct TCP_Server_Info *server) {}
119static inline void
120cifs_fscache_release_client_cookie(struct TCP_Server_Info *server) {}
121static inline void cifs_fscache_get_super_cookie(struct cifs_tcon *tcon) {}
122static inline void
123cifs_fscache_release_super_cookie(struct cifs_tcon *tcon) {}
124
125static inline void cifs_fscache_release_inode_cookie(struct inode *inode) {}
126static inline void cifs_fscache_set_inode_cookie(struct inode *inode,
127 struct file *filp) {}
128static inline void cifs_fscache_reset_inode_cookie(struct inode *inode) {}
129static inline int cifs_fscache_release_page(struct page *page, gfp_t gfp)
130{
131 return 1; /* May release page */
132}
133
134static inline void cifs_fscache_invalidate_page(struct page *page,
135 struct inode *inode) {}
136static inline int
137cifs_readpage_from_fscache(struct inode *inode, struct page *page)
138{
139 return -ENOBUFS;
140}
141
142static inline int cifs_readpages_from_fscache(struct inode *inode,
143 struct address_space *mapping,
144 struct list_head *pages,
145 unsigned *nr_pages)
146{
147 return -ENOBUFS;
148}
149
150static inline void cifs_readpage_to_fscache(struct inode *inode,
151 struct page *page) {}
152
153static inline void cifs_fscache_readpages_cancel(struct inode *inode,
154 struct list_head *pages)
155{
156}
157
158#endif /* CONFIG_CIFS_FSCACHE */
159
160#endif /* _CIFS_FSCACHE_H */