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 *);
57extern void __cifs_fscache_readpages_cancel(struct inode *, struct list_head *);
58
59extern void __cifs_readpage_to_fscache(struct inode *, struct page *);
60
61static inline void cifs_fscache_invalidate_page(struct page *page,
62					       struct inode *inode)
63{
64	if (PageFsCache(page))
65		__cifs_fscache_invalidate_page(page, inode);
66}
67
68static inline int cifs_readpage_from_fscache(struct inode *inode,
69					     struct page *page)
70{
71	if (CIFS_I(inode)->fscache)
72		return __cifs_readpage_from_fscache(inode, page);
73
74	return -ENOBUFS;
75}
76
77static inline int cifs_readpages_from_fscache(struct inode *inode,
78					      struct address_space *mapping,
79					      struct list_head *pages,
80					      unsigned *nr_pages)
81{
82	if (CIFS_I(inode)->fscache)
83		return __cifs_readpages_from_fscache(inode, mapping, pages,
84						     nr_pages);
85	return -ENOBUFS;
86}
87
88static inline void cifs_readpage_to_fscache(struct inode *inode,
89					    struct page *page)
90{
91	if (PageFsCache(page))
92		__cifs_readpage_to_fscache(inode, page);
93}
94
95static inline void cifs_fscache_readpages_cancel(struct inode *inode,
96						 struct list_head *pages)
97{
98	if (CIFS_I(inode)->fscache)
99		return __cifs_fscache_readpages_cancel(inode, pages);
100}
101
102#else /* CONFIG_CIFS_FSCACHE */
103static inline int cifs_fscache_register(void) { return 0; }
104static inline void cifs_fscache_unregister(void) {}
105
106static inline void
107cifs_fscache_get_client_cookie(struct TCP_Server_Info *server) {}
108static inline void
109cifs_fscache_release_client_cookie(struct TCP_Server_Info *server) {}
110static inline void cifs_fscache_get_super_cookie(struct cifs_tcon *tcon) {}
111static inline void
112cifs_fscache_release_super_cookie(struct cifs_tcon *tcon) {}
113
114static inline void cifs_fscache_release_inode_cookie(struct inode *inode) {}
115static inline void cifs_fscache_set_inode_cookie(struct inode *inode,
116						 struct file *filp) {}
117static inline void cifs_fscache_reset_inode_cookie(struct inode *inode) {}
118static inline int cifs_fscache_release_page(struct page *page, gfp_t gfp)
119{
120	return 1; /* May release page */
121}
122
123static inline void cifs_fscache_invalidate_page(struct page *page,
124			struct inode *inode) {}
125static inline int
126cifs_readpage_from_fscache(struct inode *inode, struct page *page)
127{
128	return -ENOBUFS;
129}
130
131static inline int cifs_readpages_from_fscache(struct inode *inode,
132					      struct address_space *mapping,
133					      struct list_head *pages,
134					      unsigned *nr_pages)
135{
136	return -ENOBUFS;
137}
138
139static inline void cifs_readpage_to_fscache(struct inode *inode,
140			struct page *page) {}
141
142static inline void cifs_fscache_readpages_cancel(struct inode *inode,
143						 struct list_head *pages)
144{
145}
146
147#endif /* CONFIG_CIFS_FSCACHE */
148
149#endif /* _CIFS_FSCACHE_H */
150