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1/* SPDX-License-Identifier: LGPL-2.1 */
2/*
3 * CIFS filesystem cache interface definitions
4 *
5 * Copyright (c) 2010 Novell, Inc.
6 * Authors(s): Suresh Jayaraman (sjayaraman@suse.de>
7 *
8 */
9#ifndef _CIFS_FSCACHE_H
10#define _CIFS_FSCACHE_H
11
12#include <linux/swap.h>
13#include <linux/fscache.h>
14
15#include "cifsglob.h"
16
17/*
18 * Coherency data attached to CIFS volume within the cache
19 */
20struct cifs_fscache_volume_coherency_data {
21 __le64 resource_id; /* unique server resource id */
22 __le64 vol_create_time;
23 __le32 vol_serial_number;
24} __packed;
25
26/*
27 * Coherency data attached to CIFS inode within the cache.
28 */
29struct cifs_fscache_inode_coherency_data {
30 __le64 last_write_time_sec;
31 __le64 last_change_time_sec;
32 __le32 last_write_time_nsec;
33 __le32 last_change_time_nsec;
34};
35
36#ifdef CONFIG_CIFS_FSCACHE
37
38/*
39 * fscache.c
40 */
41extern int cifs_fscache_get_super_cookie(struct cifs_tcon *);
42extern void cifs_fscache_release_super_cookie(struct cifs_tcon *);
43
44extern void cifs_fscache_get_inode_cookie(struct inode *inode);
45extern void cifs_fscache_release_inode_cookie(struct inode *);
46extern void cifs_fscache_unuse_inode_cookie(struct inode *inode, bool update);
47
48static inline
49void cifs_fscache_fill_coherency(struct inode *inode,
50 struct cifs_fscache_inode_coherency_data *cd)
51{
52 struct cifsInodeInfo *cifsi = CIFS_I(inode);
53
54 memset(cd, 0, sizeof(*cd));
55 cd->last_write_time_sec = cpu_to_le64(cifsi->netfs.inode.i_mtime.tv_sec);
56 cd->last_write_time_nsec = cpu_to_le32(cifsi->netfs.inode.i_mtime.tv_nsec);
57 cd->last_change_time_sec = cpu_to_le64(cifsi->netfs.inode.i_ctime.tv_sec);
58 cd->last_change_time_nsec = cpu_to_le32(cifsi->netfs.inode.i_ctime.tv_nsec);
59}
60
61
62static inline struct fscache_cookie *cifs_inode_cookie(struct inode *inode)
63{
64 return netfs_i_cookie(&CIFS_I(inode)->netfs);
65}
66
67static inline void cifs_invalidate_cache(struct inode *inode, unsigned int flags)
68{
69 struct cifs_fscache_inode_coherency_data cd;
70
71 cifs_fscache_fill_coherency(inode, &cd);
72 fscache_invalidate(cifs_inode_cookie(inode), &cd,
73 i_size_read(inode), flags);
74}
75
76extern int __cifs_fscache_query_occupancy(struct inode *inode,
77 pgoff_t first, unsigned int nr_pages,
78 pgoff_t *_data_first,
79 unsigned int *_data_nr_pages);
80
81static inline int cifs_fscache_query_occupancy(struct inode *inode,
82 pgoff_t first, unsigned int nr_pages,
83 pgoff_t *_data_first,
84 unsigned int *_data_nr_pages)
85{
86 if (!cifs_inode_cookie(inode))
87 return -ENOBUFS;
88 return __cifs_fscache_query_occupancy(inode, first, nr_pages,
89 _data_first, _data_nr_pages);
90}
91
92extern int __cifs_readpage_from_fscache(struct inode *pinode, struct page *ppage);
93extern void __cifs_readpage_to_fscache(struct inode *pinode, struct page *ppage);
94
95
96static inline int cifs_readpage_from_fscache(struct inode *inode,
97 struct page *page)
98{
99 if (cifs_inode_cookie(inode))
100 return __cifs_readpage_from_fscache(inode, page);
101 return -ENOBUFS;
102}
103
104static inline void cifs_readpage_to_fscache(struct inode *inode,
105 struct page *page)
106{
107 if (cifs_inode_cookie(inode))
108 __cifs_readpage_to_fscache(inode, page);
109}
110
111#else /* CONFIG_CIFS_FSCACHE */
112static inline
113void cifs_fscache_fill_coherency(struct inode *inode,
114 struct cifs_fscache_inode_coherency_data *cd)
115{
116}
117
118static inline int cifs_fscache_get_super_cookie(struct cifs_tcon *tcon) { return 0; }
119static inline void cifs_fscache_release_super_cookie(struct cifs_tcon *tcon) {}
120
121static inline void cifs_fscache_get_inode_cookie(struct inode *inode) {}
122static inline void cifs_fscache_release_inode_cookie(struct inode *inode) {}
123static inline void cifs_fscache_unuse_inode_cookie(struct inode *inode, bool update) {}
124static inline struct fscache_cookie *cifs_inode_cookie(struct inode *inode) { return NULL; }
125static inline void cifs_invalidate_cache(struct inode *inode, unsigned int flags) {}
126
127static inline int cifs_fscache_query_occupancy(struct inode *inode,
128 pgoff_t first, unsigned int nr_pages,
129 pgoff_t *_data_first,
130 unsigned int *_data_nr_pages)
131{
132 *_data_first = ULONG_MAX;
133 *_data_nr_pages = 0;
134 return -ENOBUFS;
135}
136
137static inline int
138cifs_readpage_from_fscache(struct inode *inode, struct page *page)
139{
140 return -ENOBUFS;
141}
142
143static inline
144void cifs_readpage_to_fscache(struct inode *inode, struct page *page) {}
145
146#endif /* CONFIG_CIFS_FSCACHE */
147
148#endif /* _CIFS_FSCACHE_H */
1/*
2 * fs/cifs/fscache.h - CIFS filesystem cache interface definitions
3 *
4 * Copyright (c) 2010 Novell, Inc.
5 * Authors(s): Suresh Jayaraman (sjayaraman@suse.de>
6 *
7 * This library is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU Lesser General Public License as published
9 * by the Free Software Foundation; either version 2.1 of the License, or
10 * (at your option) any later version.
11 *
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
15 * the GNU Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public License
18 * along with this library; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 */
21#ifndef _CIFS_FSCACHE_H
22#define _CIFS_FSCACHE_H
23
24#include <linux/fscache.h>
25
26#include "cifsglob.h"
27
28#ifdef CONFIG_CIFS_FSCACHE
29
30/*
31 * Auxiliary data attached to CIFS inode within the cache
32 */
33struct cifs_fscache_inode_auxdata {
34 u64 last_write_time_sec;
35 u64 last_change_time_sec;
36 u32 last_write_time_nsec;
37 u32 last_change_time_nsec;
38 u64 eof;
39};
40
41/*
42 * cache.c
43 */
44extern struct fscache_netfs cifs_fscache_netfs;
45extern const struct fscache_cookie_def cifs_fscache_server_index_def;
46extern const struct fscache_cookie_def cifs_fscache_super_index_def;
47extern const struct fscache_cookie_def cifs_fscache_inode_object_def;
48
49extern int cifs_fscache_register(void);
50extern void cifs_fscache_unregister(void);
51extern char *extract_sharename(const char *);
52
53/*
54 * fscache.c
55 */
56extern void cifs_fscache_get_client_cookie(struct TCP_Server_Info *);
57extern void cifs_fscache_release_client_cookie(struct TCP_Server_Info *);
58extern void cifs_fscache_get_super_cookie(struct cifs_tcon *);
59extern void cifs_fscache_release_super_cookie(struct cifs_tcon *);
60
61extern void cifs_fscache_release_inode_cookie(struct inode *);
62extern void cifs_fscache_set_inode_cookie(struct inode *, struct file *);
63extern void cifs_fscache_reset_inode_cookie(struct inode *);
64
65extern void __cifs_fscache_invalidate_page(struct page *, struct inode *);
66extern int cifs_fscache_release_page(struct page *page, gfp_t gfp);
67extern int __cifs_readpage_from_fscache(struct inode *, struct page *);
68extern int __cifs_readpages_from_fscache(struct inode *,
69 struct address_space *,
70 struct list_head *,
71 unsigned *);
72extern void __cifs_fscache_readpages_cancel(struct inode *, struct list_head *);
73
74extern void __cifs_readpage_to_fscache(struct inode *, struct page *);
75
76static inline void cifs_fscache_invalidate_page(struct page *page,
77 struct inode *inode)
78{
79 if (PageFsCache(page))
80 __cifs_fscache_invalidate_page(page, inode);
81}
82
83static inline int cifs_readpage_from_fscache(struct inode *inode,
84 struct page *page)
85{
86 if (CIFS_I(inode)->fscache)
87 return __cifs_readpage_from_fscache(inode, page);
88
89 return -ENOBUFS;
90}
91
92static inline int cifs_readpages_from_fscache(struct inode *inode,
93 struct address_space *mapping,
94 struct list_head *pages,
95 unsigned *nr_pages)
96{
97 if (CIFS_I(inode)->fscache)
98 return __cifs_readpages_from_fscache(inode, mapping, pages,
99 nr_pages);
100 return -ENOBUFS;
101}
102
103static inline void cifs_readpage_to_fscache(struct inode *inode,
104 struct page *page)
105{
106 if (PageFsCache(page))
107 __cifs_readpage_to_fscache(inode, page);
108}
109
110static inline void cifs_fscache_readpages_cancel(struct inode *inode,
111 struct list_head *pages)
112{
113 if (CIFS_I(inode)->fscache)
114 return __cifs_fscache_readpages_cancel(inode, pages);
115}
116
117#else /* CONFIG_CIFS_FSCACHE */
118static inline int cifs_fscache_register(void) { return 0; }
119static inline void cifs_fscache_unregister(void) {}
120
121static inline void
122cifs_fscache_get_client_cookie(struct TCP_Server_Info *server) {}
123static inline void
124cifs_fscache_release_client_cookie(struct TCP_Server_Info *server) {}
125static inline void cifs_fscache_get_super_cookie(struct cifs_tcon *tcon) {}
126static inline void
127cifs_fscache_release_super_cookie(struct cifs_tcon *tcon) {}
128
129static inline void cifs_fscache_release_inode_cookie(struct inode *inode) {}
130static inline void cifs_fscache_set_inode_cookie(struct inode *inode,
131 struct file *filp) {}
132static inline void cifs_fscache_reset_inode_cookie(struct inode *inode) {}
133static inline int cifs_fscache_release_page(struct page *page, gfp_t gfp)
134{
135 return 1; /* May release page */
136}
137
138static inline void cifs_fscache_invalidate_page(struct page *page,
139 struct inode *inode) {}
140static inline int
141cifs_readpage_from_fscache(struct inode *inode, struct page *page)
142{
143 return -ENOBUFS;
144}
145
146static inline int cifs_readpages_from_fscache(struct inode *inode,
147 struct address_space *mapping,
148 struct list_head *pages,
149 unsigned *nr_pages)
150{
151 return -ENOBUFS;
152}
153
154static inline void cifs_readpage_to_fscache(struct inode *inode,
155 struct page *page) {}
156
157static inline void cifs_fscache_readpages_cancel(struct inode *inode,
158 struct list_head *pages)
159{
160}
161
162#endif /* CONFIG_CIFS_FSCACHE */
163
164#endif /* _CIFS_FSCACHE_H */