Linux kernel mirror (for testing)
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1/*
2 * Ceph cache definitions.
3 *
4 * Copyright (C) 2013 by Adfin Solutions, Inc. All Rights Reserved.
5 * Written by Milosz Tanski (milosz@adfin.com)
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2
9 * as published by the Free Software Foundation.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to:
18 * Free Software Foundation
19 * 51 Franklin Street, Fifth Floor
20 * Boston, MA 02111-1301 USA
21 *
22 */
23
24#ifndef _CEPH_CACHE_H
25#define _CEPH_CACHE_H
26
27#ifdef CONFIG_CEPH_FSCACHE
28
29extern struct fscache_netfs ceph_cache_netfs;
30
31int ceph_fscache_register(void);
32void ceph_fscache_unregister(void);
33
34int ceph_fscache_register_fs(struct ceph_fs_client* fsc);
35void ceph_fscache_unregister_fs(struct ceph_fs_client* fsc);
36
37void ceph_fscache_inode_init(struct ceph_inode_info *ci);
38void ceph_fscache_register_inode_cookie(struct ceph_fs_client* fsc,
39 struct ceph_inode_info* ci);
40void ceph_fscache_unregister_inode_cookie(struct ceph_inode_info* ci);
41
42int ceph_readpage_from_fscache(struct inode *inode, struct page *page);
43int ceph_readpages_from_fscache(struct inode *inode,
44 struct address_space *mapping,
45 struct list_head *pages,
46 unsigned *nr_pages);
47void ceph_readpage_to_fscache(struct inode *inode, struct page *page);
48void ceph_invalidate_fscache_page(struct inode* inode, struct page *page);
49void ceph_queue_revalidate(struct inode *inode);
50
51static inline void ceph_fscache_invalidate(struct inode *inode)
52{
53 fscache_invalidate(ceph_inode(inode)->fscache);
54}
55
56static inline void ceph_fscache_uncache_page(struct inode *inode,
57 struct page *page)
58{
59 struct ceph_inode_info *ci = ceph_inode(inode);
60 return fscache_uncache_page(ci->fscache, page);
61}
62
63static inline int ceph_release_fscache_page(struct page *page, gfp_t gfp)
64{
65 struct inode* inode = page->mapping->host;
66 struct ceph_inode_info *ci = ceph_inode(inode);
67 return fscache_maybe_release_page(ci->fscache, page, gfp);
68}
69
70static inline void ceph_fscache_readpages_cancel(struct inode *inode,
71 struct list_head *pages)
72{
73 struct ceph_inode_info *ci = ceph_inode(inode);
74 return fscache_readpages_cancel(ci->fscache, pages);
75}
76
77#else
78
79static inline int ceph_fscache_register(void)
80{
81 return 0;
82}
83
84static inline void ceph_fscache_unregister(void)
85{
86}
87
88static inline int ceph_fscache_register_fs(struct ceph_fs_client* fsc)
89{
90 return 0;
91}
92
93static inline void ceph_fscache_unregister_fs(struct ceph_fs_client* fsc)
94{
95}
96
97static inline void ceph_fscache_inode_init(struct ceph_inode_info *ci)
98{
99}
100
101static inline void ceph_fscache_register_inode_cookie(struct ceph_fs_client* parent_fsc,
102 struct ceph_inode_info* ci)
103{
104}
105
106static inline void ceph_fscache_uncache_page(struct inode *inode,
107 struct page *pages)
108{
109}
110
111static inline int ceph_readpage_from_fscache(struct inode* inode,
112 struct page *page)
113{
114 return -ENOBUFS;
115}
116
117static inline int ceph_readpages_from_fscache(struct inode *inode,
118 struct address_space *mapping,
119 struct list_head *pages,
120 unsigned *nr_pages)
121{
122 return -ENOBUFS;
123}
124
125static inline void ceph_readpage_to_fscache(struct inode *inode,
126 struct page *page)
127{
128}
129
130static inline void ceph_fscache_invalidate(struct inode *inode)
131{
132}
133
134static inline void ceph_invalidate_fscache_page(struct inode *inode,
135 struct page *page)
136{
137}
138
139static inline void ceph_fscache_unregister_inode_cookie(struct ceph_inode_info* ci)
140{
141}
142
143static inline int ceph_release_fscache_page(struct page *page, gfp_t gfp)
144{
145 return 1;
146}
147
148static inline void ceph_fscache_readpages_cancel(struct inode *inode,
149 struct list_head *pages)
150{
151}
152
153static inline void ceph_queue_revalidate(struct inode *inode)
154{
155}
156
157#endif
158
159#endif