xref: /kernel/linux/linux-6.6/fs/ceph/cache.h (revision 62306a36) 
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 struct fscache_cookie *ceph_fscache_cookie(struct ceph_inode_info *ci)
30{
31	return netfs_i_cookie(&ci->netfs);
32}
33
34static 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
46static inline void ceph_fscache_unpin_writeback(struct inode *inode,
47						struct writeback_control *wbc)
48{
49	fscache_unpin_writeback(wbc, ceph_fscache_cookie(ceph_inode(inode)));
50}
51
52static inline int ceph_fscache_dirty_folio(struct address_space *mapping,
53		struct folio *folio)
54{
55	struct ceph_inode_info *ci = ceph_inode(mapping->host);
56
57	return fscache_dirty_folio(mapping, folio, ceph_fscache_cookie(ci));
58}
59
60static inline int ceph_begin_cache_operation(struct netfs_io_request *rreq)
61{
62	struct fscache_cookie *cookie = ceph_fscache_cookie(ceph_inode(rreq->inode));
63
64	return fscache_begin_read_operation(&rreq->cache_resources, cookie);
65}
66
67static inline bool ceph_is_cache_enabled(struct inode *inode)
68{
69	return fscache_cookie_enabled(ceph_fscache_cookie(ceph_inode(inode)));
70}
71
72static inline void ceph_fscache_note_page_release(struct inode *inode)
73{
74	struct ceph_inode_info *ci = ceph_inode(inode);
75
76	fscache_note_page_release(ceph_fscache_cookie(ci));
77}
78#else /* CONFIG_CEPH_FSCACHE */
79static inline int ceph_fscache_register_fs(struct ceph_fs_client* fsc,
80					   struct fs_context *fc)
81{
82	return 0;
83}
84
85static inline void ceph_fscache_unregister_fs(struct ceph_fs_client* fsc)
86{
87}
88
89static inline void ceph_fscache_register_inode_cookie(struct inode *inode)
90{
91}
92
93static inline void ceph_fscache_unregister_inode_cookie(struct ceph_inode_info* ci)
94{
95}
96
97static inline void ceph_fscache_use_cookie(struct inode *inode, bool will_modify)
98{
99}
100
101static inline void ceph_fscache_unuse_cookie(struct inode *inode, bool update)
102{
103}
104
105static inline void ceph_fscache_update(struct inode *inode)
106{
107}
108
109static inline void ceph_fscache_invalidate(struct inode *inode, bool dio_write)
110{
111}
112
113static inline struct fscache_cookie *ceph_fscache_cookie(struct ceph_inode_info *ci)
114{
115	return NULL;
116}
117
118static inline void ceph_fscache_resize(struct inode *inode, loff_t to)
119{
120}
121
122static inline void ceph_fscache_unpin_writeback(struct inode *inode,
123						struct writeback_control *wbc)
124{
125}
126
127static inline int ceph_fscache_dirty_folio(struct address_space *mapping,
128		struct folio *folio)
129{
130	return filemap_dirty_folio(mapping, folio);
131}
132
133static inline bool ceph_is_cache_enabled(struct inode *inode)
134{
135	return false;
136}
137
138static inline int ceph_begin_cache_operation(struct netfs_io_request *rreq)
139{
140	return -ENOBUFS;
141}
142
143static inline void ceph_fscache_note_page_release(struct inode *inode)
144{
145}
146#endif /* CONFIG_CEPH_FSCACHE */
147
148#endif
149