xref: /linux/fs/ceph/cache.h (revision 9a6b55ac) 
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, struct fs_context *fc);
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 					   struct fs_context *fc)
93 {
94 	return 0;
95 }
96 
97 static inline void ceph_fscache_unregister_fs(struct ceph_fs_client* fsc)
98 {
99 }
100 
101 static inline void ceph_fscache_inode_init(struct ceph_inode_info *ci)
102 {
103 }
104 
105 static inline void ceph_fscache_register_inode_cookie(struct inode *inode)
106 {
107 }
108 
109 static inline void ceph_fscache_unregister_inode_cookie(struct ceph_inode_info* ci)
110 {
111 }
112 
113 static inline void ceph_fscache_file_set_cookie(struct inode *inode,
114 						struct file *filp)
115 {
116 }
117 
118 static inline void ceph_fscache_revalidate_cookie(struct ceph_inode_info *ci)
119 {
120 }
121 
122 static inline void ceph_fscache_uncache_page(struct inode *inode,
123 					     struct page *pages)
124 {
125 }
126 
127 static inline int ceph_readpage_from_fscache(struct inode* inode,
128 					     struct page *page)
129 {
130 	return -ENOBUFS;
131 }
132 
133 static inline int ceph_readpages_from_fscache(struct inode *inode,
134 					      struct address_space *mapping,
135 					      struct list_head *pages,
136 					      unsigned *nr_pages)
137 {
138 	return -ENOBUFS;
139 }
140 
141 static inline void ceph_readpage_to_fscache(struct inode *inode,
142 					    struct page *page)
143 {
144 }
145 
146 static inline void ceph_fscache_invalidate(struct inode *inode)
147 {
148 }
149 
150 static inline void ceph_invalidate_fscache_page(struct inode *inode,
151 						struct page *page)
152 {
153 }
154 
155 static inline int ceph_release_fscache_page(struct page *page, gfp_t gfp)
156 {
157 	return 1;
158 }
159 
160 static inline void ceph_fscache_readpage_cancel(struct inode *inode,
161 						struct page *page)
162 {
163 }
164 
165 static inline void ceph_fscache_readpages_cancel(struct inode *inode,
166 						 struct list_head *pages)
167 {
168 }
169 
170 static inline void ceph_disable_fscache_readpage(struct ceph_inode_info *ci)
171 {
172 }
173 
174 #endif
175 
176 #endif
177