File: fscache.h

package info (click to toggle)
linux 4.19.37-3
  • links: PTS, VCS
  • area: main
  • in suites: bullseye, buster, sid
  • size: 962,264 kB
  • sloc: ansic: 16,757,120; asm: 271,404; makefile: 38,285; sh: 33,529; perl: 27,681; python: 21,031; cpp: 5,063; yacc: 4,648; lex: 2,585; awk: 1,385; ruby: 25; sed: 5
file content (164 lines) | stat: -rw-r--r-- 5,229 bytes parent folder | download | duplicates (13)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
/*
 *   fs/cifs/fscache.h - CIFS filesystem cache interface definitions
 *
 *   Copyright (c) 2010 Novell, Inc.
 *   Authors(s): Suresh Jayaraman (sjayaraman@suse.de>
 *
 *   This library is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU Lesser General Public License as published
 *   by the Free Software Foundation; either version 2.1 of the License, or
 *   (at your option) any later version.
 *
 *   This library is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
 *   the GNU Lesser General Public License for more details.
 *
 *   You should have received a copy of the GNU Lesser General Public License
 *   along with this library; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */
#ifndef _CIFS_FSCACHE_H
#define _CIFS_FSCACHE_H

#include <linux/fscache.h>

#include "cifsglob.h"

#ifdef CONFIG_CIFS_FSCACHE

/*
 * Auxiliary data attached to CIFS inode within the cache
 */
struct cifs_fscache_inode_auxdata {
	u64 last_write_time_sec;
	u64 last_change_time_sec;
	u32 last_write_time_nsec;
	u32 last_change_time_nsec;
	u64 eof;
};

/*
 * cache.c
 */
extern struct fscache_netfs cifs_fscache_netfs;
extern const struct fscache_cookie_def cifs_fscache_server_index_def;
extern const struct fscache_cookie_def cifs_fscache_super_index_def;
extern const struct fscache_cookie_def cifs_fscache_inode_object_def;

extern int cifs_fscache_register(void);
extern void cifs_fscache_unregister(void);
extern char *extract_sharename(const char *);

/*
 * fscache.c
 */
extern void cifs_fscache_get_client_cookie(struct TCP_Server_Info *);
extern void cifs_fscache_release_client_cookie(struct TCP_Server_Info *);
extern void cifs_fscache_get_super_cookie(struct cifs_tcon *);
extern void cifs_fscache_release_super_cookie(struct cifs_tcon *);

extern void cifs_fscache_release_inode_cookie(struct inode *);
extern void cifs_fscache_set_inode_cookie(struct inode *, struct file *);
extern void cifs_fscache_reset_inode_cookie(struct inode *);

extern void __cifs_fscache_invalidate_page(struct page *, struct inode *);
extern int cifs_fscache_release_page(struct page *page, gfp_t gfp);
extern int __cifs_readpage_from_fscache(struct inode *, struct page *);
extern int __cifs_readpages_from_fscache(struct inode *,
					 struct address_space *,
					 struct list_head *,
					 unsigned *);
extern void __cifs_fscache_readpages_cancel(struct inode *, struct list_head *);

extern void __cifs_readpage_to_fscache(struct inode *, struct page *);

static inline void cifs_fscache_invalidate_page(struct page *page,
					       struct inode *inode)
{
	if (PageFsCache(page))
		__cifs_fscache_invalidate_page(page, inode);
}

static inline int cifs_readpage_from_fscache(struct inode *inode,
					     struct page *page)
{
	if (CIFS_I(inode)->fscache)
		return __cifs_readpage_from_fscache(inode, page);

	return -ENOBUFS;
}

static inline int cifs_readpages_from_fscache(struct inode *inode,
					      struct address_space *mapping,
					      struct list_head *pages,
					      unsigned *nr_pages)
{
	if (CIFS_I(inode)->fscache)
		return __cifs_readpages_from_fscache(inode, mapping, pages,
						     nr_pages);
	return -ENOBUFS;
}

static inline void cifs_readpage_to_fscache(struct inode *inode,
					    struct page *page)
{
	if (PageFsCache(page))
		__cifs_readpage_to_fscache(inode, page);
}

static inline void cifs_fscache_readpages_cancel(struct inode *inode,
						 struct list_head *pages)
{
	if (CIFS_I(inode)->fscache)
		return __cifs_fscache_readpages_cancel(inode, pages);
}

#else /* CONFIG_CIFS_FSCACHE */
static inline int cifs_fscache_register(void) { return 0; }
static inline void cifs_fscache_unregister(void) {}

static inline void
cifs_fscache_get_client_cookie(struct TCP_Server_Info *server) {}
static inline void
cifs_fscache_release_client_cookie(struct TCP_Server_Info *server) {}
static inline void cifs_fscache_get_super_cookie(struct cifs_tcon *tcon) {}
static inline void
cifs_fscache_release_super_cookie(struct cifs_tcon *tcon) {}

static inline void cifs_fscache_release_inode_cookie(struct inode *inode) {}
static inline void cifs_fscache_set_inode_cookie(struct inode *inode,
						 struct file *filp) {}
static inline void cifs_fscache_reset_inode_cookie(struct inode *inode) {}
static inline int cifs_fscache_release_page(struct page *page, gfp_t gfp)
{
	return 1; /* May release page */
}

static inline void cifs_fscache_invalidate_page(struct page *page,
			struct inode *inode) {}
static inline int
cifs_readpage_from_fscache(struct inode *inode, struct page *page)
{
	return -ENOBUFS;
}

static inline int cifs_readpages_from_fscache(struct inode *inode,
					      struct address_space *mapping,
					      struct list_head *pages,
					      unsigned *nr_pages)
{
	return -ENOBUFS;
}

static inline void cifs_readpage_to_fscache(struct inode *inode,
			struct page *page) {}

static inline void cifs_fscache_readpages_cancel(struct inode *inode,
						 struct list_head *pages)
{
}

#endif /* CONFIG_CIFS_FSCACHE */

#endif /* _CIFS_FSCACHE_H */