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 timespec64 ctime = inode_get_ctime(inode);
53 struct timespec64 mtime = inode_get_mtime(inode);
54
55 memset(cd, 0, sizeof(*cd));
56 cd->last_write_time_sec = cpu_to_le64(mtime.tv_sec);
57 cd->last_write_time_nsec = cpu_to_le32(mtime.tv_nsec);
58 cd->last_change_time_sec = cpu_to_le64(ctime.tv_sec);
59 cd->last_change_time_nsec = cpu_to_le32(ctime.tv_nsec);
60}
61
62
63static inline struct fscache_cookie *cifs_inode_cookie(struct inode *inode)
64{
65 return netfs_i_cookie(ctx: &CIFS_I(inode)->netfs);
66}
67
68static inline void cifs_invalidate_cache(struct inode *inode, unsigned int flags)
69{
70 struct cifs_fscache_inode_coherency_data cd;
71
72 cifs_fscache_fill_coherency(inode, cd: &cd);
73 fscache_invalidate(cookie: cifs_inode_cookie(inode), aux_data: &cd,
74 size: i_size_read(inode), flags);
75}
76
77extern int __cifs_fscache_query_occupancy(struct inode *inode,
78 pgoff_t first, unsigned int nr_pages,
79 pgoff_t *_data_first,
80 unsigned int *_data_nr_pages);
81
82static inline int cifs_fscache_query_occupancy(struct inode *inode,
83 pgoff_t first, unsigned int nr_pages,
84 pgoff_t *_data_first,
85 unsigned int *_data_nr_pages)
86{
87 if (!cifs_inode_cookie(inode))
88 return -ENOBUFS;
89 return __cifs_fscache_query_occupancy(inode, first, nr_pages,
90 _data_first, _data_nr_pages);
91}
92
93extern int __cifs_readpage_from_fscache(struct inode *pinode, struct page *ppage);
94extern void __cifs_readahead_to_fscache(struct inode *pinode, loff_t pos, size_t len);
95
96
97static inline int cifs_readpage_from_fscache(struct inode *inode,
98 struct page *page)
99{
100 if (cifs_inode_cookie(inode))
101 return __cifs_readpage_from_fscache(pinode: inode, ppage: page);
102 return -ENOBUFS;
103}
104
105static inline void cifs_readahead_to_fscache(struct inode *inode,
106 loff_t pos, size_t len)
107{
108 if (cifs_inode_cookie(inode))
109 __cifs_readahead_to_fscache(pinode: inode, pos, len);
110}
111
112static inline bool cifs_fscache_enabled(struct inode *inode)
113{
114 return fscache_cookie_enabled(cifs_inode_cookie(inode));
115}
116
117#else /* CONFIG_CIFS_FSCACHE */
118static inline
119void cifs_fscache_fill_coherency(struct inode *inode,
120 struct cifs_fscache_inode_coherency_data *cd)
121{
122}
123
124static inline int cifs_fscache_get_super_cookie(struct cifs_tcon *tcon) { return 0; }
125static inline void cifs_fscache_release_super_cookie(struct cifs_tcon *tcon) {}
126
127static inline void cifs_fscache_get_inode_cookie(struct inode *inode) {}
128static inline void cifs_fscache_release_inode_cookie(struct inode *inode) {}
129static inline void cifs_fscache_unuse_inode_cookie(struct inode *inode, bool update) {}
130static inline struct fscache_cookie *cifs_inode_cookie(struct inode *inode) { return NULL; }
131static inline void cifs_invalidate_cache(struct inode *inode, unsigned int flags) {}
132static inline bool cifs_fscache_enabled(struct inode *inode) { return false; }
133
134static inline int cifs_fscache_query_occupancy(struct inode *inode,
135 pgoff_t first, unsigned int nr_pages,
136 pgoff_t *_data_first,
137 unsigned int *_data_nr_pages)
138{
139 *_data_first = ULONG_MAX;
140 *_data_nr_pages = 0;
141 return -ENOBUFS;
142}
143
144static inline int
145cifs_readpage_from_fscache(struct inode *inode, struct page *page)
146{
147 return -ENOBUFS;
148}
149
150static inline
151void cifs_readahead_to_fscache(struct inode *inode, loff_t pos, size_t len) {}
152
153#endif /* CONFIG_CIFS_FSCACHE */
154
155#endif /* _CIFS_FSCACHE_H */
156

source code of linux/fs/smb/client/fscache.h