xref: /linux/fs/ceph/cache.h (revision a9f80df4f51440303d063b55bb98720857693821) 
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 #include <linux/fscache.h>
16 
17 int ceph_fscache_register_fs(struct ceph_fs_client* fsc, struct fs_context *fc);
18 void ceph_fscache_unregister_fs(struct ceph_fs_client* fsc);
19 
20 void ceph_fscache_register_inode_cookie(struct inode *inode);
21 void ceph_fscache_unregister_inode_cookie(struct ceph_inode_info* ci);
22 
23 void ceph_fscache_use_cookie(struct inode *inode, bool will_modify);
24 void ceph_fscache_unuse_cookie(struct inode *inode, bool update);
25 
26 void ceph_fscache_update(struct inode *inode);
27 void ceph_fscache_invalidate(struct inode *inode, bool dio_write);
28 
29 static inline struct fscache_cookie *ceph_fscache_cookie(struct ceph_inode_info *ci)
30 {
31 	return netfs_i_cookie(&ci->netfs);
32 }
33 
34 static inline void ceph_fscache_resize(struct inode *inode, loff_t to)
35 {
36 	struct ceph_inode_info *ci = ceph_inode(inode);
37 	struct fscache_cookie *cookie = ceph_fscache_cookie(ci);
38 
39 	if (cookie) {
40 		ceph_fscache_use_cookie(inode, true);
41 		fscache_resize_cookie(cookie, to);
42 		ceph_fscache_unuse_cookie(inode, true);
43 	}
44 }
45 
46 static inline int ceph_fscache_unpin_writeback(struct inode *inode,
47 						struct writeback_control *wbc)
48 {
49 	return netfs_unpin_writeback(inode, wbc);
50 }
51 
52 #define ceph_fscache_dirty_folio netfs_dirty_folio
53 
54 static inline bool ceph_is_cache_enabled(struct inode *inode)
55 {
56 	return fscache_cookie_enabled(ceph_fscache_cookie(ceph_inode(inode)));
57 }
58 
59 #else /* CONFIG_CEPH_FSCACHE */
60 static inline int ceph_fscache_register_fs(struct ceph_fs_client* fsc,
61 					   struct fs_context *fc)
62 {
63 	return 0;
64 }
65 
66 static inline void ceph_fscache_unregister_fs(struct ceph_fs_client* fsc)
67 {
68 }
69 
70 static inline void ceph_fscache_register_inode_cookie(struct inode *inode)
71 {
72 }
73 
74 static inline void ceph_fscache_unregister_inode_cookie(struct ceph_inode_info* ci)
75 {
76 }
77 
78 static inline void ceph_fscache_use_cookie(struct inode *inode, bool will_modify)
79 {
80 }
81 
82 static inline void ceph_fscache_unuse_cookie(struct inode *inode, bool update)
83 {
84 }
85 
86 static inline void ceph_fscache_update(struct inode *inode)
87 {
88 }
89 
90 static inline void ceph_fscache_invalidate(struct inode *inode, bool dio_write)
91 {
92 }
93 
94 static inline struct fscache_cookie *ceph_fscache_cookie(struct ceph_inode_info *ci)
95 {
96 	return NULL;
97 }
98 
99 static inline void ceph_fscache_resize(struct inode *inode, loff_t to)
100 {
101 }
102 
103 static inline int ceph_fscache_unpin_writeback(struct inode *inode,
104 					       struct writeback_control *wbc)
105 {
106 	return 0;
107 }
108 
109 #define ceph_fscache_dirty_folio filemap_dirty_folio
110 
111 static inline bool ceph_is_cache_enabled(struct inode *inode)
112 {
113 	return false;
114 }
115 #endif /* CONFIG_CEPH_FSCACHE */
116 
117 #endif
118