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
77static inline bool cifs_fscache_enabled(struct inode *inode)
78{
79 return fscache_cookie_enabled(cifs_inode_cookie(inode));
80}
81
82#else /* CONFIG_CIFS_FSCACHE */
83static inline
84void cifs_fscache_fill_coherency(struct inode *inode,
85 struct cifs_fscache_inode_coherency_data *cd)
86{
87}
88
89static inline int cifs_fscache_get_super_cookie(struct cifs_tcon *tcon) { return 0; }
90static inline void cifs_fscache_release_super_cookie(struct cifs_tcon *tcon) {}
91
92static inline void cifs_fscache_get_inode_cookie(struct inode *inode) {}
93static inline void cifs_fscache_release_inode_cookie(struct inode *inode) {}
94static inline void cifs_fscache_unuse_inode_cookie(struct inode *inode, bool update) {}
95static inline struct fscache_cookie *cifs_inode_cookie(struct inode *inode) { return NULL; }
96static inline void cifs_invalidate_cache(struct inode *inode, unsigned int flags) {}
97static inline bool cifs_fscache_enabled(struct inode *inode) { return false; }
98
99#endif /* CONFIG_CIFS_FSCACHE */
100
101#endif /* _CIFS_FSCACHE_H */
102

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