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Linux kernel mirror (for testing)
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linux
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_readpage_cancel(struct inode *inode,
71 struct page *page)
72{
73 struct ceph_inode_info *ci = ceph_inode(inode);
74 if (fscache_cookie_valid(ci->fscache) && PageFsCache(page))
75 __fscache_uncache_page(ci->fscache, page);
76}
77
78static inline void ceph_fscache_readpages_cancel(struct inode *inode,
79 struct list_head *pages)
80{
81 struct ceph_inode_info *ci = ceph_inode(inode);
82 return fscache_readpages_cancel(ci->fscache, pages);
83}
84
85#else
86
87static inline int ceph_fscache_register(void)
88{
89 return 0;
90}
91
92static inline void ceph_fscache_unregister(void)
93{
94}
95
96static inline int ceph_fscache_register_fs(struct ceph_fs_client* fsc)
97{
98 return 0;
99}
100
101static inline void ceph_fscache_unregister_fs(struct ceph_fs_client* fsc)
102{
103}
104
105static inline void ceph_fscache_inode_init(struct ceph_inode_info *ci)
106{
107}
108
109static inline void ceph_fscache_register_inode_cookie(struct ceph_fs_client* parent_fsc,
110 struct ceph_inode_info* ci)
111{
112}
113
114static inline void ceph_fscache_uncache_page(struct inode *inode,
115 struct page *pages)
116{
117}
118
119static inline int ceph_readpage_from_fscache(struct inode* inode,
120 struct page *page)
121{
122 return -ENOBUFS;
123}
124
125static inline int ceph_readpages_from_fscache(struct inode *inode,
126 struct address_space *mapping,
127 struct list_head *pages,
128 unsigned *nr_pages)
129{
130 return -ENOBUFS;
131}
132
133static inline void ceph_readpage_to_fscache(struct inode *inode,
134 struct page *page)
135{
136}
137
138static inline void ceph_fscache_invalidate(struct inode *inode)
139{
140}
141
142static inline void ceph_invalidate_fscache_page(struct inode *inode,
143 struct page *page)
144{
145}
146
147static inline void ceph_fscache_unregister_inode_cookie(struct ceph_inode_info* ci)
148{
149}
150
151static inline int ceph_release_fscache_page(struct page *page, gfp_t gfp)
152{
153 return 1;
154}
155
156static inline void ceph_fscache_readpage_cancel(struct inode *inode,
157 struct page *page)
158{
159}
160
161static inline void ceph_fscache_readpages_cancel(struct inode *inode,
162 struct list_head *pages)
163{
164}
165
166static inline void ceph_queue_revalidate(struct inode *inode)
167{
168}
169
170#endif
171
172#endif