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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/* SPDX-License-Identifier: LGPL-2.1 */
2/*
3 * fs/cifs/fscache.h - 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/fscache.h>
13
14#include "cifsglob.h"
15
16#ifdef CONFIG_CIFS_FSCACHE
17
18/*
19 * Auxiliary data attached to CIFS superblock within the cache
20 */
21struct cifs_fscache_super_auxdata {
22 u64 resource_id; /* unique server resource id */
23 __le64 vol_create_time;
24 u32 vol_serial_number;
25} __packed;
26
27/*
28 * Auxiliary data attached to CIFS inode within the cache
29 */
30struct cifs_fscache_inode_auxdata {
31 u64 last_write_time_sec;
32 u64 last_change_time_sec;
33 u32 last_write_time_nsec;
34 u32 last_change_time_nsec;
35 u64 eof;
36};
37
38/*
39 * cache.c
40 */
41extern struct fscache_netfs cifs_fscache_netfs;
42extern const struct fscache_cookie_def cifs_fscache_server_index_def;
43extern const struct fscache_cookie_def cifs_fscache_super_index_def;
44extern const struct fscache_cookie_def cifs_fscache_inode_object_def;
45
46extern int cifs_fscache_register(void);
47extern void cifs_fscache_unregister(void);
48
49/*
50 * fscache.c
51 */
52extern void cifs_fscache_get_client_cookie(struct TCP_Server_Info *);
53extern void cifs_fscache_release_client_cookie(struct TCP_Server_Info *);
54extern void cifs_fscache_get_super_cookie(struct cifs_tcon *);
55extern void cifs_fscache_release_super_cookie(struct cifs_tcon *);
56
57extern void cifs_fscache_release_inode_cookie(struct inode *);
58extern void cifs_fscache_set_inode_cookie(struct inode *, struct file *);
59extern void cifs_fscache_reset_inode_cookie(struct inode *);
60
61extern void __cifs_fscache_invalidate_page(struct page *, struct inode *);
62extern int cifs_fscache_release_page(struct page *page, gfp_t gfp);
63extern int __cifs_readpage_from_fscache(struct inode *, struct page *);
64extern int __cifs_readpages_from_fscache(struct inode *,
65 struct address_space *,
66 struct list_head *,
67 unsigned *);
68extern void __cifs_fscache_readpages_cancel(struct inode *, struct list_head *);
69
70extern void __cifs_readpage_to_fscache(struct inode *, struct page *);
71
72static inline void cifs_fscache_invalidate_page(struct page *page,
73 struct inode *inode)
74{
75 if (PageFsCache(page))
76 __cifs_fscache_invalidate_page(page, inode);
77}
78
79static inline int cifs_readpage_from_fscache(struct inode *inode,
80 struct page *page)
81{
82 if (CIFS_I(inode)->fscache)
83 return __cifs_readpage_from_fscache(inode, page);
84
85 return -ENOBUFS;
86}
87
88static inline int cifs_readpages_from_fscache(struct inode *inode,
89 struct address_space *mapping,
90 struct list_head *pages,
91 unsigned *nr_pages)
92{
93 if (CIFS_I(inode)->fscache)
94 return __cifs_readpages_from_fscache(inode, mapping, pages,
95 nr_pages);
96 return -ENOBUFS;
97}
98
99static inline void cifs_readpage_to_fscache(struct inode *inode,
100 struct page *page)
101{
102 if (PageFsCache(page))
103 __cifs_readpage_to_fscache(inode, page);
104}
105
106static inline void cifs_fscache_readpages_cancel(struct inode *inode,
107 struct list_head *pages)
108{
109 if (CIFS_I(inode)->fscache)
110 return __cifs_fscache_readpages_cancel(inode, pages);
111}
112
113#else /* CONFIG_CIFS_FSCACHE */
114static inline int cifs_fscache_register(void) { return 0; }
115static inline void cifs_fscache_unregister(void) {}
116
117static inline void
118cifs_fscache_get_client_cookie(struct TCP_Server_Info *server) {}
119static inline void
120cifs_fscache_release_client_cookie(struct TCP_Server_Info *server) {}
121static inline void cifs_fscache_get_super_cookie(struct cifs_tcon *tcon) {}
122static inline void
123cifs_fscache_release_super_cookie(struct cifs_tcon *tcon) {}
124
125static inline void cifs_fscache_release_inode_cookie(struct inode *inode) {}
126static inline void cifs_fscache_set_inode_cookie(struct inode *inode,
127 struct file *filp) {}
128static inline void cifs_fscache_reset_inode_cookie(struct inode *inode) {}
129static inline int cifs_fscache_release_page(struct page *page, gfp_t gfp)
130{
131 return 1; /* May release page */
132}
133
134static inline void cifs_fscache_invalidate_page(struct page *page,
135 struct inode *inode) {}
136static inline int
137cifs_readpage_from_fscache(struct inode *inode, struct page *page)
138{
139 return -ENOBUFS;
140}
141
142static inline int cifs_readpages_from_fscache(struct inode *inode,
143 struct address_space *mapping,
144 struct list_head *pages,
145 unsigned *nr_pages)
146{
147 return -ENOBUFS;
148}
149
150static inline void cifs_readpage_to_fscache(struct inode *inode,
151 struct page *page) {}
152
153static inline void cifs_fscache_readpages_cancel(struct inode *inode,
154 struct list_head *pages)
155{
156}
157
158#endif /* CONFIG_CIFS_FSCACHE */
159
160#endif /* _CIFS_FSCACHE_H */