xref: /openbmc/linux/fs/ceph/cache.h (revision e7f127b2) 
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 void ceph_fscache_inode_init(struct ceph_inode_info *ci)
30 {
31 	ci->fscache = NULL;
32 }
33 
34 static inline struct fscache_cookie *ceph_fscache_cookie(struct ceph_inode_info *ci)
35 {
36 	return ci->fscache;
37 }
38 
39 static inline void ceph_fscache_resize(struct inode *inode, loff_t to)
40 {
41 	struct ceph_inode_info *ci = ceph_inode(inode);
42 	struct fscache_cookie *cookie = ceph_fscache_cookie(ci);
43 
44 	if (cookie) {
45 		ceph_fscache_use_cookie(inode, true);
46 		fscache_resize_cookie(cookie, to);
47 		ceph_fscache_unuse_cookie(inode, true);
48 	}
49 }
50 
51 static inline void ceph_fscache_unpin_writeback(struct inode *inode,
52 						struct writeback_control *wbc)
53 {
54 	fscache_unpin_writeback(wbc, ceph_fscache_cookie(ceph_inode(inode)));
55 }
56 
57 static inline int ceph_fscache_set_page_dirty(struct page *page)
58 {
59 	struct inode *inode = page->mapping->host;
60 	struct ceph_inode_info *ci = ceph_inode(inode);
61 
62 	return fscache_set_page_dirty(page, ceph_fscache_cookie(ci));
63 }
64 
65 static inline int ceph_begin_cache_operation(struct netfs_read_request *rreq)
66 {
67 	struct fscache_cookie *cookie = ceph_fscache_cookie(ceph_inode(rreq->inode));
68 
69 	return fscache_begin_read_operation(&rreq->cache_resources, cookie);
70 }
71 
72 static inline bool ceph_is_cache_enabled(struct inode *inode)
73 {
74 	return fscache_cookie_enabled(ceph_fscache_cookie(ceph_inode(inode)));
75 }
76 
77 static inline void ceph_fscache_note_page_release(struct inode *inode)
78 {
79 	struct ceph_inode_info *ci = ceph_inode(inode);
80 
81 	fscache_note_page_release(ceph_fscache_cookie(ci));
82 }
83 #else /* CONFIG_CEPH_FSCACHE */
84 static inline int ceph_fscache_register_fs(struct ceph_fs_client* fsc,
85 					   struct fs_context *fc)
86 {
87 	return 0;
88 }
89 
90 static inline void ceph_fscache_unregister_fs(struct ceph_fs_client* fsc)
91 {
92 }
93 
94 static inline void ceph_fscache_inode_init(struct ceph_inode_info *ci)
95 {
96 }
97 
98 static inline void ceph_fscache_register_inode_cookie(struct inode *inode)
99 {
100 }
101 
102 static inline void ceph_fscache_unregister_inode_cookie(struct ceph_inode_info* ci)
103 {
104 }
105 
106 static inline void ceph_fscache_use_cookie(struct inode *inode, bool will_modify)
107 {
108 }
109 
110 static inline void ceph_fscache_unuse_cookie(struct inode *inode, bool update)
111 {
112 }
113 
114 static inline void ceph_fscache_update(struct inode *inode)
115 {
116 }
117 
118 static inline void ceph_fscache_invalidate(struct inode *inode, bool dio_write)
119 {
120 }
121 
122 static inline struct fscache_cookie *ceph_fscache_cookie(struct ceph_inode_info *ci)
123 {
124 	return NULL;
125 }
126 
127 static inline void ceph_fscache_resize(struct inode *inode, loff_t to)
128 {
129 }
130 
131 static inline void ceph_fscache_unpin_writeback(struct inode *inode,
132 						struct writeback_control *wbc)
133 {
134 }
135 
136 static inline int ceph_fscache_set_page_dirty(struct page *page)
137 {
138 	return __set_page_dirty_nobuffers(page);
139 }
140 
141 static inline bool ceph_is_cache_enabled(struct inode *inode)
142 {
143 	return false;
144 }
145 
146 static inline int ceph_begin_cache_operation(struct netfs_read_request *rreq)
147 {
148 	return -ENOBUFS;
149 }
150 
151 static inline void ceph_fscache_note_page_release(struct inode *inode)
152 {
153 }
154 #endif /* CONFIG_CEPH_FSCACHE */
155 
156 #endif
157