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 cifsTconInfo *);
44extern void cifs_fscache_release_super_cookie(struct cifsTconInfo *);
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 cifsTconInfo *tcon) {}
103static inline void
104cifs_fscache_release_super_cookie(struct cifsTconInfo *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 */
137