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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
17int ceph_fscache_register_fs(struct ceph_fs_client* fsc, struct fs_context *fc);
18void ceph_fscache_unregister_fs(struct ceph_fs_client* fsc);
19
20void ceph_fscache_register_inode_cookie(struct inode *inode);
21void ceph_fscache_unregister_inode_cookie(struct ceph_inode_info* ci);
22
23void ceph_fscache_use_cookie(struct inode *inode, bool will_modify);
24void ceph_fscache_unuse_cookie(struct inode *inode, bool update);
25
26void ceph_fscache_update(struct inode *inode);
27void ceph_fscache_invalidate(struct inode *inode, bool dio_write);
28
29static inline void ceph_fscache_inode_init(struct ceph_inode_info *ci)
30{
31 ci->fscache = NULL;
32}
33
34static inline struct fscache_cookie *ceph_fscache_cookie(struct ceph_inode_info *ci)
35{
36 return ci->fscache;
37}
38
39static 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
51static 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
57static 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
65static 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
72static inline bool ceph_is_cache_enabled(struct inode *inode)
73{
74 return fscache_cookie_enabled(ceph_fscache_cookie(ceph_inode(inode)));
75}
76
77static 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 */
84static inline int ceph_fscache_register_fs(struct ceph_fs_client* fsc,
85 struct fs_context *fc)
86{
87 return 0;
88}
89
90static inline void ceph_fscache_unregister_fs(struct ceph_fs_client* fsc)
91{
92}
93
94static inline void ceph_fscache_inode_init(struct ceph_inode_info *ci)
95{
96}
97
98static inline void ceph_fscache_register_inode_cookie(struct inode *inode)
99{
100}
101
102static inline void ceph_fscache_unregister_inode_cookie(struct ceph_inode_info* ci)
103{
104}
105
106static inline void ceph_fscache_use_cookie(struct inode *inode, bool will_modify)
107{
108}
109
110static inline void ceph_fscache_unuse_cookie(struct inode *inode, bool update)
111{
112}
113
114static inline void ceph_fscache_update(struct inode *inode)
115{
116}
117
118static inline void ceph_fscache_invalidate(struct inode *inode, bool dio_write)
119{
120}
121
122static inline struct fscache_cookie *ceph_fscache_cookie(struct ceph_inode_info *ci)
123{
124 return NULL;
125}
126
127static inline void ceph_fscache_resize(struct inode *inode, loff_t to)
128{
129}
130
131static inline void ceph_fscache_unpin_writeback(struct inode *inode,
132 struct writeback_control *wbc)
133{
134}
135
136static inline int ceph_fscache_set_page_dirty(struct page *page)
137{
138 return __set_page_dirty_nobuffers(page);
139}
140
141static inline bool ceph_is_cache_enabled(struct inode *inode)
142{
143 return false;
144}
145
146static inline int ceph_begin_cache_operation(struct netfs_read_request *rreq)
147{
148 return -ENOBUFS;
149}
150
151static inline void ceph_fscache_note_page_release(struct inode *inode)
152{
153}
154#endif /* CONFIG_CEPH_FSCACHE */
155
156#endif