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gerrit-public.fairphone.software / kernel / msm-4.9 / 87e3c0553fcbea79bf9f17fc5694484ecf3ae5e8 / . / fs / cifs / fscache.h
blob: 63539323e0b960f3ecf9788eca6e67ba0ec8ce67 [file] [log] [blame]
Suresh Jayaramanf579cf32010-07-05 18:11:50 +0530[diff] [blame]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
Suresh Jayaraman488f1d2d2010-07-05 18:12:15 +0530[diff] [blame]26#include "cifsglob.h"
27
Suresh Jayaramanf579cf32010-07-05 18:11:50 +0530[diff] [blame]28#ifdef CONFIG_CIFS_FSCACHE
29
30extern struct fscache_netfs cifs_fscache_netfs;
Suresh Jayaraman488f1d2d2010-07-05 18:12:15 +0530[diff] [blame]31extern const struct fscache_cookie_def cifs_fscache_server_index_def;
Suresh Jayaramand03382c2010-07-05 18:12:27 +0530[diff] [blame]32extern const struct fscache_cookie_def cifs_fscache_super_index_def;
Suresh Jayaraman9451a9a2010-07-05 18:12:45 +0530[diff] [blame]33extern const struct fscache_cookie_def cifs_fscache_inode_object_def;
34
Suresh Jayaramanf579cf32010-07-05 18:11:50 +0530[diff] [blame]35extern int cifs_fscache_register(void);
36extern void cifs_fscache_unregister(void);
37
Suresh Jayaraman488f1d2d2010-07-05 18:12:15 +0530[diff] [blame]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 *);
Steve French96daf2b2011-05-27 04:34:02 +0000[diff] [blame]43extern void cifs_fscache_get_super_cookie(struct cifs_tcon *);
44extern void cifs_fscache_release_super_cookie(struct cifs_tcon *);
Suresh Jayaraman488f1d2d2010-07-05 18:12:15 +0530[diff] [blame]45
Suresh Jayaraman9451a9a2010-07-05 18:12:45 +0530[diff] [blame]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
Suresh Jayaraman85f2d6b2010-07-05 18:13:00 +0530[diff] [blame]50extern void __cifs_fscache_invalidate_page(struct page *, struct inode *);
51extern int cifs_fscache_release_page(struct page *page, gfp_t gfp);
Suresh Jayaraman56698232010-07-05 18:13:25 +0530[diff] [blame]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 *);
Suresh Jayaraman85f2d6b2010-07-05 18:13:00 +0530[diff] [blame]57
Suresh Jayaraman9dc06552010-07-05 18:13:11 +0530[diff] [blame]58extern void __cifs_readpage_to_fscache(struct inode *, struct page *);
59
Suresh Jayaraman85f2d6b2010-07-05 18:13:00 +0530[diff] [blame]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
Suresh Jayaraman56698232010-07-05 18:13:25 +0530[diff] [blame]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
Suresh Jayaraman9dc06552010-07-05 18:13:11 +0530[diff] [blame]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
Suresh Jayaramanf579cf32010-07-05 18:11:50 +0530[diff] [blame]94#else /* CONFIG_CIFS_FSCACHE */
95static inline int cifs_fscache_register(void) { return 0; }
96static inline void cifs_fscache_unregister(void) {}
97
Suresh Jayaraman488f1d2d2010-07-05 18:12:15 +0530[diff] [blame]98static inline void
99cifs_fscache_get_client_cookie(struct TCP_Server_Info *server) {}
100static inline void
Steve Frenchc5e04a32010-07-16 04:18:36 +0000[diff] [blame]101cifs_fscache_release_client_cookie(struct TCP_Server_Info *server) {}
Steve French96daf2b2011-05-27 04:34:02 +0000[diff] [blame]102static inline void cifs_fscache_get_super_cookie(struct cifs_tcon *tcon) {}
Suresh Jayaramand03382c2010-07-05 18:12:27 +0530[diff] [blame]103static inline void
Steve French96daf2b2011-05-27 04:34:02 +0000[diff] [blame]104cifs_fscache_release_super_cookie(struct cifs_tcon *tcon) {}
Suresh Jayaraman488f1d2d2010-07-05 18:12:15 +0530[diff] [blame]105
Suresh Jayaraman9451a9a2010-07-05 18:12:45 +0530[diff] [blame]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) {}
Steve Frenchd0e6f442010-07-16 04:24:54 +0000[diff] [blame]110static inline int cifs_fscache_release_page(struct page *page, gfp_t gfp)
Suresh Jayaraman85f2d6b2010-07-05 18:13:00 +0530[diff] [blame]111{
112 return 1; /* May release page */
113}
Suresh Jayaraman9451a9a2010-07-05 18:12:45 +0530[diff] [blame]114
Steve Frenchd0e6f442010-07-16 04:24:54 +0000[diff] [blame]115static inline void cifs_fscache_invalidate_page(struct page *page,
116 struct inode *inode) {}
Suresh Jayaraman56698232010-07-05 18:13:25 +0530[diff] [blame]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
Suresh Jayaraman9dc06552010-07-05 18:13:11 +0530[diff] [blame]131static inline void cifs_readpage_to_fscache(struct inode *inode,
132 struct page *page) {}
Suresh Jayaraman9451a9a2010-07-05 18:12:45 +0530[diff] [blame]133
Suresh Jayaramanf579cf32010-07-05 18:11:50 +0530[diff] [blame]134#endif /* CONFIG_CIFS_FSCACHE */
135
136#endif /* _CIFS_FSCACHE_H */