xref: /linux/fs/ceph/cache.h (revision 172cdcaefea5c297fdb3d20b7d5aff60ae4fbce6) 
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 #include <linux/netfs.h>
13 
14 #ifdef CONFIG_CEPH_FSCACHE
15 
16 extern struct fscache_netfs ceph_cache_netfs;
17 
18 int ceph_fscache_register(void);
19 void ceph_fscache_unregister(void);
20 
21 int ceph_fscache_register_fs(struct ceph_fs_client* fsc, struct fs_context *fc);
22 void ceph_fscache_unregister_fs(struct ceph_fs_client* fsc);
23 
24 void ceph_fscache_register_inode_cookie(struct inode *inode);
25 void ceph_fscache_unregister_inode_cookie(struct ceph_inode_info* ci);
26 void ceph_fscache_file_set_cookie(struct inode *inode, struct file *filp);
27 void ceph_fscache_revalidate_cookie(struct ceph_inode_info *ci);
28 
29 int ceph_readpage_from_fscache(struct inode *inode, struct page *page);
30 int ceph_readpages_from_fscache(struct inode *inode,
31 				struct address_space *mapping,
32 				struct list_head *pages,
33 				unsigned *nr_pages);
34 
35 static inline void ceph_fscache_inode_init(struct ceph_inode_info *ci)
36 {
37 	ci->fscache = NULL;
38 }
39 
40 static inline struct fscache_cookie *ceph_fscache_cookie(struct ceph_inode_info *ci)
41 {
42 	return ci->fscache;
43 }
44 
45 static inline void ceph_fscache_invalidate(struct inode *inode)
46 {
47 	fscache_invalidate(ceph_inode(inode)->fscache);
48 }
49 
50 static inline bool ceph_is_cache_enabled(struct inode *inode)
51 {
52 	struct fscache_cookie *cookie = ceph_fscache_cookie(ceph_inode(inode));
53 
54 	if (!cookie)
55 		return false;
56 	return fscache_cookie_enabled(cookie);
57 }
58 
59 static inline int ceph_begin_cache_operation(struct netfs_read_request *rreq)
60 {
61 	struct fscache_cookie *cookie = ceph_fscache_cookie(ceph_inode(rreq->inode));
62 
63 	return fscache_begin_read_operation(rreq, cookie);
64 }
65 #else
66 
67 static inline int ceph_fscache_register(void)
68 {
69 	return 0;
70 }
71 
72 static inline void ceph_fscache_unregister(void)
73 {
74 }
75 
76 static inline int ceph_fscache_register_fs(struct ceph_fs_client* fsc,
77 					   struct fs_context *fc)
78 {
79 	return 0;
80 }
81 
82 static inline void ceph_fscache_unregister_fs(struct ceph_fs_client* fsc)
83 {
84 }
85 
86 static inline void ceph_fscache_inode_init(struct ceph_inode_info *ci)
87 {
88 }
89 
90 static inline struct fscache_cookie *ceph_fscache_cookie(struct ceph_inode_info *ci)
91 {
92 	return NULL;
93 }
94 
95 static inline void ceph_fscache_register_inode_cookie(struct inode *inode)
96 {
97 }
98 
99 static inline void ceph_fscache_unregister_inode_cookie(struct ceph_inode_info* ci)
100 {
101 }
102 
103 static inline void ceph_fscache_file_set_cookie(struct inode *inode,
104 						struct file *filp)
105 {
106 }
107 
108 static inline void ceph_fscache_invalidate(struct inode *inode)
109 {
110 }
111 
112 static inline bool ceph_is_cache_enabled(struct inode *inode)
113 {
114 	return false;
115 }
116 
117 static inline int ceph_begin_cache_operation(struct netfs_read_request *rreq)
118 {
119 	return -ENOBUFS;
120 }
121 #endif
122 
123 #endif /* _CEPH_CACHE_H */
124