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 
ceph_fscache_inode_init(struct ceph_inode_info * ci)29 static inline void ceph_fscache_inode_init(struct ceph_inode_info *ci)
30 {
31 	ci->fscache = NULL;
32 }
33 
ceph_fscache_cookie(struct ceph_inode_info * ci)34 static inline struct fscache_cookie *ceph_fscache_cookie(struct ceph_inode_info *ci)
35 {
36 	return ci->fscache;
37 }
38 
ceph_fscache_invalidate(struct inode * inode)39 static inline void ceph_fscache_invalidate(struct inode *inode)
40 {
41 	fscache_invalidate(ceph_inode(inode)->fscache);
42 }
43 
ceph_is_cache_enabled(struct inode * inode)44 static inline bool ceph_is_cache_enabled(struct inode *inode)
45 {
46 	struct fscache_cookie *cookie = ceph_fscache_cookie(ceph_inode(inode));
47 
48 	if (!cookie)
49 		return false;
50 	return fscache_cookie_enabled(cookie);
51 }
52 
ceph_begin_cache_operation(struct netfs_read_request * rreq)53 static inline int ceph_begin_cache_operation(struct netfs_read_request *rreq)
54 {
55 	struct fscache_cookie *cookie = ceph_fscache_cookie(ceph_inode(rreq->inode));
56 
57 	return fscache_begin_read_operation(rreq, cookie);
58 }
59 #else
60 
ceph_fscache_register(void)61 static inline int ceph_fscache_register(void)
62 {
63 	return 0;
64 }
65 
ceph_fscache_unregister(void)66 static inline void ceph_fscache_unregister(void)
67 {
68 }
69 
ceph_fscache_register_fs(struct ceph_fs_client * fsc,struct fs_context * fc)70 static inline int ceph_fscache_register_fs(struct ceph_fs_client* fsc,
71 					   struct fs_context *fc)
72 {
73 	return 0;
74 }
75 
ceph_fscache_unregister_fs(struct ceph_fs_client * fsc)76 static inline void ceph_fscache_unregister_fs(struct ceph_fs_client* fsc)
77 {
78 }
79 
ceph_fscache_inode_init(struct ceph_inode_info * ci)80 static inline void ceph_fscache_inode_init(struct ceph_inode_info *ci)
81 {
82 }
83 
ceph_fscache_cookie(struct ceph_inode_info * ci)84 static inline struct fscache_cookie *ceph_fscache_cookie(struct ceph_inode_info *ci)
85 {
86 	return NULL;
87 }
88 
ceph_fscache_register_inode_cookie(struct inode * inode)89 static inline void ceph_fscache_register_inode_cookie(struct inode *inode)
90 {
91 }
92 
ceph_fscache_unregister_inode_cookie(struct ceph_inode_info * ci)93 static inline void ceph_fscache_unregister_inode_cookie(struct ceph_inode_info* ci)
94 {
95 }
96 
ceph_fscache_file_set_cookie(struct inode * inode,struct file * filp)97 static inline void ceph_fscache_file_set_cookie(struct inode *inode,
98 						struct file *filp)
99 {
100 }
101 
ceph_fscache_invalidate(struct inode * inode)102 static inline void ceph_fscache_invalidate(struct inode *inode)
103 {
104 }
105 
ceph_is_cache_enabled(struct inode * inode)106 static inline bool ceph_is_cache_enabled(struct inode *inode)
107 {
108 	return false;
109 }
110 
ceph_begin_cache_operation(struct netfs_read_request * rreq)111 static inline int ceph_begin_cache_operation(struct netfs_read_request *rreq)
112 {
113 	return -ENOBUFS;
114 }
115 #endif
116 
117 #endif /* _CEPH_CACHE_H */
118