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fs/cifs: keep guid when assigning fid to fileinfo
[mirror_ubuntu-zesty-kernel.git] / fs / cifs / fscache.h
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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
30extern struct fscache_netfs cifs_fscache_netfs;
488f1d2d 31extern const struct fscache_cookie_def cifs_fscache_server_index_def;
d03382ce 32extern const struct fscache_cookie_def cifs_fscache_super_index_def;
9451a9a5
SJ		 33extern const struct fscache_cookie_def cifs_fscache_inode_object_def;
34
f579cf3c
SJ		 35extern int cifs_fscache_register(void);
36extern void cifs_fscache_unregister(void);
37
488f1d2d
SJ		 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 *);
96daf2b0
SF		 43extern void cifs_fscache_get_super_cookie(struct cifs_tcon *);
44extern void cifs_fscache_release_super_cookie(struct cifs_tcon *);
488f1d2d 45
9451a9a5
SJ		 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
85f2d6b4
SJ		 50extern void __cifs_fscache_invalidate_page(struct page *, struct inode *);
51extern int cifs_fscache_release_page(struct page *page, gfp_t gfp);
56698236
SJ		 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 *);
54afa990 57extern void __cifs_fscache_readpages_cancel(struct inode *, struct list_head *);
85f2d6b4 58
9dc06558
SJ		 59extern void __cifs_readpage_to_fscache(struct inode *, struct page *);
60
85f2d6b4
SJ		 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
56698236
SJ		 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
9dc06558
SJ		 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
54afa990
DH		 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
f579cf3c
SJ		 102#else /* CONFIG_CIFS_FSCACHE */
103static inline int cifs_fscache_register(void) { return 0; }
104static inline void cifs_fscache_unregister(void) {}
105
488f1d2d
SJ		 106static inline void
107cifs_fscache_get_client_cookie(struct TCP_Server_Info *server) {}
108static inline void
c5e04a3e 109cifs_fscache_release_client_cookie(struct TCP_Server_Info *server) {}
96daf2b0 110static inline void cifs_fscache_get_super_cookie(struct cifs_tcon *tcon) {}
d03382ce 111static inline void
96daf2b0 112cifs_fscache_release_super_cookie(struct cifs_tcon *tcon) {}
488f1d2d 113
9451a9a5
SJ		 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) {}
d0e6f44e 118static inline int cifs_fscache_release_page(struct page *page, gfp_t gfp)
85f2d6b4
SJ		 119{
120 return 1; /* May release page */
121}
9451a9a5 122
d0e6f44e
SF		 123static inline void cifs_fscache_invalidate_page(struct page *page,
124 struct inode *inode) {}
56698236
SJ		 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
9dc06558
SJ		 139static inline void cifs_readpage_to_fscache(struct inode *inode,
140 struct page *page) {}
9451a9a5 141
54afa990
DH		 142static inline void cifs_fscache_readpages_cancel(struct inode *inode,
143 struct list_head *pages)
144{
145}
146
f579cf3c
SJ		 147#endif /* CONFIG_CIFS_FSCACHE */
148
149#endif /* _CIFS_FSCACHE_H */
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