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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 | ||
29 | int ceph_fscache_register(void); | |
30 | void ceph_fscache_unregister(void); | |
31 | ||
32 | int ceph_fscache_register_fs(struct ceph_fs_client* fsc); | |
33 | void ceph_fscache_unregister_fs(struct ceph_fs_client* fsc); | |
34 | ||
35 | void ceph_fscache_inode_init(struct ceph_inode_info *ci); | |
36 | void ceph_fscache_register_inode_cookie(struct ceph_fs_client* fsc, | |
37 | struct ceph_inode_info* ci); | |
38 | void ceph_fscache_unregister_inode_cookie(struct ceph_inode_info* ci); | |
39 | ||
40 | int ceph_readpage_from_fscache(struct inode *inode, struct page *page); | |
41 | int ceph_readpages_from_fscache(struct inode *inode, | |
42 | struct address_space *mapping, | |
43 | struct list_head *pages, | |
44 | unsigned *nr_pages); | |
45 | void ceph_readpage_to_fscache(struct inode *inode, struct page *page); | |
46 | void ceph_invalidate_fscache_page(struct inode* inode, struct page *page); | |
47 | void ceph_queue_revalidate(struct inode *inode); | |
48 | ||
49 | static inline void ceph_fscache_invalidate(struct inode *inode) | |
50 | { | |
51 | fscache_invalidate(ceph_inode(inode)->fscache); | |
52 | } | |
53 | ||
54 | static inline int ceph_release_fscache_page(struct page *page, gfp_t gfp) | |
55 | { | |
56 | struct inode* inode = page->mapping->host; | |
57 | struct ceph_inode_info *ci = ceph_inode(inode); | |
58 | return fscache_maybe_release_page(ci->fscache, page, gfp); | |
59 | } | |
60 | ||
61 | #else | |
62 | ||
63 | static inline int ceph_fscache_register(void) | |
64 | { | |
65 | return 0; | |
66 | } | |
67 | ||
68 | static inline void ceph_fscache_unregister(void) | |
69 | { | |
70 | } | |
71 | ||
72 | static inline int ceph_fscache_register_fs(struct ceph_fs_client* fsc) | |
73 | { | |
74 | return 0; | |
75 | } | |
76 | ||
77 | static inline void ceph_fscache_unregister_fs(struct ceph_fs_client* fsc) | |
78 | { | |
79 | } | |
80 | ||
81 | static inline void ceph_fscache_inode_init(struct ceph_inode_info *ci) | |
82 | { | |
83 | } | |
84 | ||
85 | static inline void ceph_fscache_register_inode_cookie(struct ceph_fs_client* parent_fsc, | |
86 | struct ceph_inode_info* ci) | |
87 | { | |
88 | } | |
89 | ||
90 | static inline void ceph_fscache_unregister_inode_cookie(struct ceph_inode_info* ci) | |
91 | { | |
92 | } | |
93 | ||
94 | static inline int ceph_readpage_from_fscache(struct inode* inode, | |
95 | struct page *page) | |
96 | { | |
97 | return -ENOBUFS; | |
98 | } | |
99 | ||
100 | static inline int ceph_readpages_from_fscache(struct inode *inode, | |
101 | struct address_space *mapping, | |
102 | struct list_head *pages, | |
103 | unsigned *nr_pages) | |
104 | { | |
105 | return -ENOBUFS; | |
106 | } | |
107 | ||
108 | static inline void ceph_readpage_to_fscache(struct inode *inode, | |
109 | struct page *page) | |
110 | { | |
111 | } | |
112 | ||
113 | static inline void ceph_fscache_invalidate(struct inode *inode) | |
114 | { | |
115 | } | |
116 | ||
117 | static inline void ceph_invalidate_fscache_page(struct inode *inode, | |
118 | struct page *page) | |
119 | { | |
120 | } | |
121 | ||
122 | static inline int ceph_release_fscache_page(struct page *page, gfp_t gfp) | |
123 | { | |
124 | return 1; | |
125 | } | |
126 | ||
127 | static inline void ceph_fscache_readpages_cancel(struct inode *inode, | |
128 | struct list_head *pages) | |
129 | { | |
130 | } | |
131 | ||
132 | static inline void ceph_queue_revalidate(struct inode *inode) | |
133 | { | |
134 | } | |
135 | ||
136 | #endif | |
137 | ||
138 | #endif |