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_update_objectsize(struct inode *inode)
52{
53	struct ceph_inode_info *ci = ceph_inode(inode);
54	fscache_attr_changed(ci->fscache);
55}
56
57static inline void ceph_fscache_invalidate(struct inode *inode)
58{
59	fscache_invalidate(ceph_inode(inode)->fscache);
60}
61
62static 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
69static 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
76static 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
84static 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
93static inline int ceph_fscache_register(void)
94{
95	return 0;
96}
97
98static inline void ceph_fscache_unregister(void)
99{
100}
101
102static inline int ceph_fscache_register_fs(struct ceph_fs_client* fsc)
103{
104	return 0;
105}
106
107static inline void ceph_fscache_unregister_fs(struct ceph_fs_client* fsc)
108{
109}
110
111static inline void ceph_fscache_inode_init(struct ceph_inode_info *ci)
112{
113}
114
115static inline void ceph_fscache_register_inode_cookie(struct ceph_fs_client* parent_fsc,
116						      struct ceph_inode_info* ci)
117{
118}
119
120static inline void ceph_fscache_uncache_page(struct inode *inode,
121					     struct page *pages)
122{
123}
124
125static inline int ceph_readpage_from_fscache(struct inode* inode,
126					     struct page *page)
127{
128	return -ENOBUFS;
129}
130
131static 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
139static inline void ceph_readpage_to_fscache(struct inode *inode,
140					    struct page *page)
141{
142}
143
144static inline void ceph_fscache_update_objectsize(struct inode *inode)
145{
146}
147
148static inline void ceph_fscache_invalidate(struct inode *inode)
149{
150}
151
152static inline void ceph_invalidate_fscache_page(struct inode *inode,
153						struct page *page)
154{
155}
156
157static inline void ceph_fscache_unregister_inode_cookie(struct ceph_inode_info* ci)
158{
159}
160
161static inline int ceph_release_fscache_page(struct page *page, gfp_t gfp)
162{
163	return 1;
164}
165
166static inline void ceph_fscache_readpage_cancel(struct inode *inode,
167						struct page *page)
168{
169}
170
171static inline void ceph_fscache_readpages_cancel(struct inode *inode,
172						 struct list_head *pages)
173{
174}
175
176static inline void ceph_queue_revalidate(struct inode *inode)
177{
178}
179
180#endif
181
182#endif
183