xref: /openbmc/linux/fs/ceph/cache.h (revision b593bce5) 
1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3  * Ceph cache definitions.
4  *
5  *  Copyright (C) 2013 by Adfin Solutions, Inc. All Rights Reserved.
6  *  Written by Milosz Tanski (milosz@adfin.com)
7  */
8 
9 #ifndef _CEPH_CACHE_H
10 #define _CEPH_CACHE_H
11 
12 #ifdef CONFIG_CEPH_FSCACHE
13 
14 extern struct fscache_netfs ceph_cache_netfs;
15 
16 int ceph_fscache_register(void);
17 void ceph_fscache_unregister(void);
18 
19 int ceph_fscache_register_fs(struct ceph_fs_client* fsc);
20 void ceph_fscache_unregister_fs(struct ceph_fs_client* fsc);
21 
22 void ceph_fscache_register_inode_cookie(struct inode *inode);
23 void ceph_fscache_unregister_inode_cookie(struct ceph_inode_info* ci);
24 void ceph_fscache_file_set_cookie(struct inode *inode, struct file *filp);
25 void ceph_fscache_revalidate_cookie(struct ceph_inode_info *ci);
26 
27 int ceph_readpage_from_fscache(struct inode *inode, struct page *page);
28 int ceph_readpages_from_fscache(struct inode *inode,
29 				struct address_space *mapping,
30 				struct list_head *pages,
31 				unsigned *nr_pages);
32 void ceph_readpage_to_fscache(struct inode *inode, struct page *page);
33 void ceph_invalidate_fscache_page(struct inode* inode, struct page *page);
34 
35 static inline void ceph_fscache_inode_init(struct ceph_inode_info *ci)
36 {
37 	ci->fscache = NULL;
38 	ci->i_fscache_gen = 0;
39 }
40 
41 static inline void ceph_fscache_invalidate(struct inode *inode)
42 {
43 	fscache_invalidate(ceph_inode(inode)->fscache);
44 }
45 
46 static inline void ceph_fscache_uncache_page(struct inode *inode,
47 					     struct page *page)
48 {
49 	struct ceph_inode_info *ci = ceph_inode(inode);
50 	return fscache_uncache_page(ci->fscache, page);
51 }
52 
53 static inline int ceph_release_fscache_page(struct page *page, gfp_t gfp)
54 {
55 	struct inode* inode = page->mapping->host;
56 	struct ceph_inode_info *ci = ceph_inode(inode);
57 	return fscache_maybe_release_page(ci->fscache, page, gfp);
58 }
59 
60 static inline void ceph_fscache_readpage_cancel(struct inode *inode,
61 						struct page *page)
62 {
63 	struct ceph_inode_info *ci = ceph_inode(inode);
64 	if (fscache_cookie_valid(ci->fscache) && PageFsCache(page))
65 		__fscache_uncache_page(ci->fscache, page);
66 }
67 
68 static inline void ceph_fscache_readpages_cancel(struct inode *inode,
69 						 struct list_head *pages)
70 {
71 	struct ceph_inode_info *ci = ceph_inode(inode);
72 	return fscache_readpages_cancel(ci->fscache, pages);
73 }
74 
75 static inline void ceph_disable_fscache_readpage(struct ceph_inode_info *ci)
76 {
77 	ci->i_fscache_gen = ci->i_rdcache_gen - 1;
78 }
79 
80 #else
81 
82 static inline int ceph_fscache_register(void)
83 {
84 	return 0;
85 }
86 
87 static inline void ceph_fscache_unregister(void)
88 {
89 }
90 
91 static inline int ceph_fscache_register_fs(struct ceph_fs_client* fsc)
92 {
93 	return 0;
94 }
95 
96 static inline void ceph_fscache_unregister_fs(struct ceph_fs_client* fsc)
97 {
98 }
99 
100 static inline void ceph_fscache_inode_init(struct ceph_inode_info *ci)
101 {
102 }
103 
104 static inline void ceph_fscache_register_inode_cookie(struct inode *inode)
105 {
106 }
107 
108 static inline void ceph_fscache_unregister_inode_cookie(struct ceph_inode_info* ci)
109 {
110 }
111 
112 static inline void ceph_fscache_file_set_cookie(struct inode *inode,
113 						struct file *filp)
114 {
115 }
116 
117 static inline void ceph_fscache_revalidate_cookie(struct ceph_inode_info *ci)
118 {
119 }
120 
121 static inline void ceph_fscache_uncache_page(struct inode *inode,
122 					     struct page *pages)
123 {
124 }
125 
126 static inline int ceph_readpage_from_fscache(struct inode* inode,
127 					     struct page *page)
128 {
129 	return -ENOBUFS;
130 }
131 
132 static inline int ceph_readpages_from_fscache(struct inode *inode,
133 					      struct address_space *mapping,
134 					      struct list_head *pages,
135 					      unsigned *nr_pages)
136 {
137 	return -ENOBUFS;
138 }
139 
140 static inline void ceph_readpage_to_fscache(struct inode *inode,
141 					    struct page *page)
142 {
143 }
144 
145 static inline void ceph_fscache_invalidate(struct inode *inode)
146 {
147 }
148 
149 static inline void ceph_invalidate_fscache_page(struct inode *inode,
150 						struct page *page)
151 {
152 }
153 
154 static inline int ceph_release_fscache_page(struct page *page, gfp_t gfp)
155 {
156 	return 1;
157 }
158 
159 static inline void ceph_fscache_readpage_cancel(struct inode *inode,
160 						struct page *page)
161 {
162 }
163 
164 static inline void ceph_fscache_readpages_cancel(struct inode *inode,
165 						 struct list_head *pages)
166 {
167 }
168 
169 static inline void ceph_disable_fscache_readpage(struct ceph_inode_info *ci)
170 {
171 }
172 
173 #endif
174 
175 #endif
176