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
29 extern struct fscache_netfs ceph_cache_netfs;
30
31 int ceph_fscache_register(void);
32 void ceph_fscache_unregister(void);
33
34 int ceph_fscache_register_fs(struct ceph_fs_client* fsc);
35 void ceph_fscache_unregister_fs(struct ceph_fs_client* fsc);
36
37 void ceph_fscache_inode_init(struct ceph_inode_info *ci);
38 void ceph_fscache_register_inode_cookie(struct ceph_fs_client* fsc,
39 struct ceph_inode_info* ci);
40 void ceph_fscache_unregister_inode_cookie(struct ceph_inode_info* ci);
41
42 int ceph_readpage_from_fscache(struct inode *inode, struct page *page);
43 int ceph_readpages_from_fscache(struct inode *inode,
44 struct address_space *mapping,
45 struct list_head *pages,
46 unsigned *nr_pages);
47 void ceph_readpage_to_fscache(struct inode *inode, struct page *page);
48 void ceph_invalidate_fscache_page(struct inode* inode, struct page *page);
49 void ceph_queue_revalidate(struct inode *inode);
50
ceph_fscache_update_objectsize(struct inode * inode)51 static inline void ceph_fscache_update_objectsize(struct inode *inode)
52 {
53 struct ceph_inode_info *ci = ceph_inode(inode);
54 fscache_attr_changed(ci->fscache);
55 }
56
ceph_fscache_invalidate(struct inode * inode)57 static inline void ceph_fscache_invalidate(struct inode *inode)
58 {
59 fscache_invalidate(ceph_inode(inode)->fscache);
60 }
61
ceph_fscache_uncache_page(struct inode * inode,struct page * page)62 static inline void ceph_fscache_uncache_page(struct inode *inode,
63 struct page *page)
64 {
65 struct ceph_inode_info *ci = ceph_inode(inode);
66 return fscache_uncache_page(ci->fscache, page);
67 }
68
ceph_release_fscache_page(struct page * page,gfp_t gfp)69 static inline int ceph_release_fscache_page(struct page *page, gfp_t gfp)
70 {
71 struct inode* inode = page->mapping->host;
72 struct ceph_inode_info *ci = ceph_inode(inode);
73 return fscache_maybe_release_page(ci->fscache, page, gfp);
74 }
75
ceph_fscache_readpage_cancel(struct inode * inode,struct page * page)76 static inline void ceph_fscache_readpage_cancel(struct inode *inode,
77 struct page *page)
78 {
79 struct ceph_inode_info *ci = ceph_inode(inode);
80 if (fscache_cookie_valid(ci->fscache) && PageFsCache(page))
81 __fscache_uncache_page(ci->fscache, page);
82 }
83
ceph_fscache_readpages_cancel(struct inode * inode,struct list_head * pages)84 static inline void ceph_fscache_readpages_cancel(struct inode *inode,
85 struct list_head *pages)
86 {
87 struct ceph_inode_info *ci = ceph_inode(inode);
88 return fscache_readpages_cancel(ci->fscache, pages);
89 }
90
91 #else
92
ceph_fscache_register(void)93 static inline int ceph_fscache_register(void)
94 {
95 return 0;
96 }
97
ceph_fscache_unregister(void)98 static inline void ceph_fscache_unregister(void)
99 {
100 }
101
ceph_fscache_register_fs(struct ceph_fs_client * fsc)102 static inline int ceph_fscache_register_fs(struct ceph_fs_client* fsc)
103 {
104 return 0;
105 }
106
ceph_fscache_unregister_fs(struct ceph_fs_client * fsc)107 static inline void ceph_fscache_unregister_fs(struct ceph_fs_client* fsc)
108 {
109 }
110
ceph_fscache_inode_init(struct ceph_inode_info * ci)111 static inline void ceph_fscache_inode_init(struct ceph_inode_info *ci)
112 {
113 }
114
ceph_fscache_register_inode_cookie(struct ceph_fs_client * parent_fsc,struct ceph_inode_info * ci)115 static inline void ceph_fscache_register_inode_cookie(struct ceph_fs_client* parent_fsc,
116 struct ceph_inode_info* ci)
117 {
118 }
119
ceph_fscache_uncache_page(struct inode * inode,struct page * pages)120 static inline void ceph_fscache_uncache_page(struct inode *inode,
121 struct page *pages)
122 {
123 }
124
ceph_readpage_from_fscache(struct inode * inode,struct page * page)125 static inline int ceph_readpage_from_fscache(struct inode* inode,
126 struct page *page)
127 {
128 return -ENOBUFS;
129 }
130
ceph_readpages_from_fscache(struct inode * inode,struct address_space * mapping,struct list_head * pages,unsigned * nr_pages)131 static inline int ceph_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
ceph_readpage_to_fscache(struct inode * inode,struct page * page)139 static inline void ceph_readpage_to_fscache(struct inode *inode,
140 struct page *page)
141 {
142 }
143
ceph_fscache_update_objectsize(struct inode * inode)144 static inline void ceph_fscache_update_objectsize(struct inode *inode)
145 {
146 }
147
ceph_fscache_invalidate(struct inode * inode)148 static inline void ceph_fscache_invalidate(struct inode *inode)
149 {
150 }
151
ceph_invalidate_fscache_page(struct inode * inode,struct page * page)152 static inline void ceph_invalidate_fscache_page(struct inode *inode,
153 struct page *page)
154 {
155 }
156
ceph_fscache_unregister_inode_cookie(struct ceph_inode_info * ci)157 static inline void ceph_fscache_unregister_inode_cookie(struct ceph_inode_info* ci)
158 {
159 }
160
ceph_release_fscache_page(struct page * page,gfp_t gfp)161 static inline int ceph_release_fscache_page(struct page *page, gfp_t gfp)
162 {
163 return 1;
164 }
165
ceph_fscache_readpage_cancel(struct inode * inode,struct page * page)166 static inline void ceph_fscache_readpage_cancel(struct inode *inode,
167 struct page *page)
168 {
169 }
170
ceph_fscache_readpages_cancel(struct inode * inode,struct list_head * pages)171 static inline void ceph_fscache_readpages_cancel(struct inode *inode,
172 struct list_head *pages)
173 {
174 }
175
ceph_queue_revalidate(struct inode * inode)176 static inline void ceph_queue_revalidate(struct inode *inode)
177 {
178 }
179
180 #endif
181
182 #endif
183