xref: /kernel/linux/linux-5.10/fs/ceph/cache.h (revision 8c2ecf20) 
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
14extern struct fscache_netfs ceph_cache_netfs;
15
16int ceph_fscache_register(void);
17void ceph_fscache_unregister(void);
18
19int ceph_fscache_register_fs(struct ceph_fs_client* fsc, struct fs_context *fc);
20void ceph_fscache_unregister_fs(struct ceph_fs_client* fsc);
21
22void ceph_fscache_register_inode_cookie(struct inode *inode);
23void ceph_fscache_unregister_inode_cookie(struct ceph_inode_info* ci);
24void ceph_fscache_file_set_cookie(struct inode *inode, struct file *filp);
25void ceph_fscache_revalidate_cookie(struct ceph_inode_info *ci);
26
27int ceph_readpage_from_fscache(struct inode *inode, struct page *page);
28int ceph_readpages_from_fscache(struct inode *inode,
29				struct address_space *mapping,
30				struct list_head *pages,
31				unsigned *nr_pages);
32void ceph_readpage_to_fscache(struct inode *inode, struct page *page);
33void ceph_invalidate_fscache_page(struct inode* inode, struct page *page);
34
35static inline void ceph_fscache_inode_init(struct ceph_inode_info *ci)
36{
37	ci->fscache = NULL;
38	ci->i_fscache_gen = 0;
39}
40
41static inline void ceph_fscache_invalidate(struct inode *inode)
42{
43	fscache_invalidate(ceph_inode(inode)->fscache);
44}
45
46static 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
53static 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
60static 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
68static 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
75static 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
82static inline int ceph_fscache_register(void)
83{
84	return 0;
85}
86
87static inline void ceph_fscache_unregister(void)
88{
89}
90
91static inline int ceph_fscache_register_fs(struct ceph_fs_client* fsc,
92					   struct fs_context *fc)
93{
94	return 0;
95}
96
97static inline void ceph_fscache_unregister_fs(struct ceph_fs_client* fsc)
98{
99}
100
101static inline void ceph_fscache_inode_init(struct ceph_inode_info *ci)
102{
103}
104
105static inline void ceph_fscache_register_inode_cookie(struct inode *inode)
106{
107}
108
109static inline void ceph_fscache_unregister_inode_cookie(struct ceph_inode_info* ci)
110{
111}
112
113static inline void ceph_fscache_file_set_cookie(struct inode *inode,
114						struct file *filp)
115{
116}
117
118static inline void ceph_fscache_revalidate_cookie(struct ceph_inode_info *ci)
119{
120}
121
122static inline void ceph_fscache_uncache_page(struct inode *inode,
123					     struct page *pages)
124{
125}
126
127static inline int ceph_readpage_from_fscache(struct inode* inode,
128					     struct page *page)
129{
130	return -ENOBUFS;
131}
132
133static 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
141static inline void ceph_readpage_to_fscache(struct inode *inode,
142					    struct page *page)
143{
144}
145
146static inline void ceph_fscache_invalidate(struct inode *inode)
147{
148}
149
150static inline void ceph_invalidate_fscache_page(struct inode *inode,
151						struct page *page)
152{
153}
154
155static inline int ceph_release_fscache_page(struct page *page, gfp_t gfp)
156{
157	return 1;
158}
159
160static inline void ceph_fscache_readpage_cancel(struct inode *inode,
161						struct page *page)
162{
163}
164
165static inline void ceph_fscache_readpages_cancel(struct inode *inode,
166						 struct list_head *pages)
167{
168}
169
170static inline void ceph_disable_fscache_readpage(struct ceph_inode_info *ci)
171{
172}
173
174#endif
175
176#endif
177