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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_register_inode_cookie(struct inode *inode);
38void ceph_fscache_unregister_inode_cookie(struct ceph_inode_info* ci);
39void ceph_fscache_file_set_cookie(struct inode *inode, struct file *filp);
40void ceph_fscache_revalidate_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);
49
50static inline void ceph_fscache_inode_init(struct ceph_inode_info *ci)
51{
52 ci->fscache = NULL;
53 ci->i_fscache_gen = 0;
54}
55
56static inline void ceph_fscache_invalidate(struct inode *inode)
57{
58 fscache_invalidate(ceph_inode(inode)->fscache);
59}
60
61static inline void ceph_fscache_uncache_page(struct inode *inode,
62 struct page *page)
63{
64 struct ceph_inode_info *ci = ceph_inode(inode);
65 return fscache_uncache_page(ci->fscache, page);
66}
67
68static inline int ceph_release_fscache_page(struct page *page, gfp_t gfp)
69{
70 struct inode* inode = page->mapping->host;
71 struct ceph_inode_info *ci = ceph_inode(inode);
72 return fscache_maybe_release_page(ci->fscache, page, gfp);
73}
74
75static inline void ceph_fscache_readpage_cancel(struct inode *inode,
76 struct page *page)
77{
78 struct ceph_inode_info *ci = ceph_inode(inode);
79 if (fscache_cookie_valid(ci->fscache) && PageFsCache(page))
80 __fscache_uncache_page(ci->fscache, page);
81}
82
83static inline void ceph_fscache_readpages_cancel(struct inode *inode,
84 struct list_head *pages)
85{
86 struct ceph_inode_info *ci = ceph_inode(inode);
87 return fscache_readpages_cancel(ci->fscache, pages);
88}
89
90static inline void ceph_disable_fscache_readpage(struct ceph_inode_info *ci)
91{
92 ci->i_fscache_gen = ci->i_rdcache_gen - 1;
93}
94
95#else
96
97static inline int ceph_fscache_register(void)
98{
99 return 0;
100}
101
102static inline void ceph_fscache_unregister(void)
103{
104}
105
106static inline int ceph_fscache_register_fs(struct ceph_fs_client* fsc)
107{
108 return 0;
109}
110
111static inline void ceph_fscache_unregister_fs(struct ceph_fs_client* fsc)
112{
113}
114
115static inline void ceph_fscache_inode_init(struct ceph_inode_info *ci)
116{
117}
118
119static inline void ceph_fscache_register_inode_cookie(struct inode *inode)
120{
121}
122
123static inline void ceph_fscache_unregister_inode_cookie(struct ceph_inode_info* ci)
124{
125}
126
127static inline void ceph_fscache_file_set_cookie(struct inode *inode,
128 struct file *filp)
129{
130}
131
132static inline void ceph_fscache_revalidate_cookie(struct ceph_inode_info *ci)
133{
134}
135
136static inline void ceph_fscache_uncache_page(struct inode *inode,
137 struct page *pages)
138{
139}
140
141static inline int ceph_readpage_from_fscache(struct inode* inode,
142 struct page *page)
143{
144 return -ENOBUFS;
145}
146
147static inline int ceph_readpages_from_fscache(struct inode *inode,
148 struct address_space *mapping,
149 struct list_head *pages,
150 unsigned *nr_pages)
151{
152 return -ENOBUFS;
153}
154
155static inline void ceph_readpage_to_fscache(struct inode *inode,
156 struct page *page)
157{
158}
159
160static inline void ceph_fscache_invalidate(struct inode *inode)
161{
162}
163
164static inline void ceph_invalidate_fscache_page(struct inode *inode,
165 struct page *page)
166{
167}
168
169static inline int ceph_release_fscache_page(struct page *page, gfp_t gfp)
170{
171 return 1;
172}
173
174static inline void ceph_fscache_readpage_cancel(struct inode *inode,
175 struct page *page)
176{
177}
178
179static inline void ceph_fscache_readpages_cancel(struct inode *inode,
180 struct list_head *pages)
181{
182}
183
184static inline void ceph_disable_fscache_readpage(struct ceph_inode_info *ci)
185{
186}
187
188#endif
189
190#endif