summaryrefslogtreecommitdiff
path: root/fs/cifs/fscache.h
blob: 67b601041f0a3701a5bdcf5e8f227071dc7478c9 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
/* SPDX-License-Identifier: LGPL-2.1 */
/*
 *   CIFS filesystem cache interface definitions
 *
 *   Copyright (c) 2010 Novell, Inc.
 *   Authors(s): Suresh Jayaraman (sjayaraman@suse.de>
 *
 */
#ifndef _CIFS_FSCACHE_H
#define _CIFS_FSCACHE_H

#include <linux/swap.h>
#include <linux/fscache.h>

#include "cifsglob.h"

/*
 * Coherency data attached to CIFS volume within the cache
 */
struct cifs_fscache_volume_coherency_data {
	__le64	resource_id;		/* unique server resource id */
	__le64	vol_create_time;
	__le32	vol_serial_number;
} __packed;

/*
 * Coherency data attached to CIFS inode within the cache.
 */
struct cifs_fscache_inode_coherency_data {
	__le64 last_write_time_sec;
	__le64 last_change_time_sec;
	__le32 last_write_time_nsec;
	__le32 last_change_time_nsec;
};

#ifdef CONFIG_CIFS_FSCACHE

/*
 * fscache.c
 */
extern int cifs_fscache_get_super_cookie(struct cifs_tcon *);
extern void cifs_fscache_release_super_cookie(struct cifs_tcon *);

extern void cifs_fscache_get_inode_cookie(struct inode *inode);
extern void cifs_fscache_release_inode_cookie(struct inode *);
extern void cifs_fscache_unuse_inode_cookie(struct inode *inode, bool update);

static inline
void cifs_fscache_fill_coherency(struct inode *inode,
				 struct cifs_fscache_inode_coherency_data *cd)
{
	struct cifsInodeInfo *cifsi = CIFS_I(inode);

	memset(cd, 0, sizeof(*cd));
	cd->last_write_time_sec   = cpu_to_le64(cifsi->netfs.inode.i_mtime.tv_sec);
	cd->last_write_time_nsec  = cpu_to_le32(cifsi->netfs.inode.i_mtime.tv_nsec);
	cd->last_change_time_sec  = cpu_to_le64(cifsi->netfs.inode.i_ctime.tv_sec);
	cd->last_change_time_nsec = cpu_to_le32(cifsi->netfs.inode.i_ctime.tv_nsec);
}


static inline struct fscache_cookie *cifs_inode_cookie(struct inode *inode)
{
	return netfs_i_cookie(&CIFS_I(inode)->netfs);
}

static inline void cifs_invalidate_cache(struct inode *inode, unsigned int flags)
{
	struct cifs_fscache_inode_coherency_data cd;

	cifs_fscache_fill_coherency(inode, &cd);
	fscache_invalidate(cifs_inode_cookie(inode), &cd,
			   i_size_read(inode), flags);
}

extern int __cifs_fscache_query_occupancy(struct inode *inode,
					  pgoff_t first, unsigned int nr_pages,
					  pgoff_t *_data_first,
					  unsigned int *_data_nr_pages);

static inline int cifs_fscache_query_occupancy(struct inode *inode,
					       pgoff_t first, unsigned int nr_pages,
					       pgoff_t *_data_first,
					       unsigned int *_data_nr_pages)
{
	if (!cifs_inode_cookie(inode))
		return -ENOBUFS;
	return __cifs_fscache_query_occupancy(inode, first, nr_pages,
					      _data_first, _data_nr_pages);
}

extern int __cifs_readpage_from_fscache(struct inode *pinode, struct page *ppage);
extern void __cifs_readpage_to_fscache(struct inode *pinode, struct page *ppage);


static inline int cifs_readpage_from_fscache(struct inode *inode,
					     struct page *page)
{
	if (cifs_inode_cookie(inode))
		return __cifs_readpage_from_fscache(inode, page);
	return -ENOBUFS;
}

static inline void cifs_readpage_to_fscache(struct inode *inode,
					    struct page *page)
{
	if (cifs_inode_cookie(inode))
		__cifs_readpage_to_fscache(inode, page);
}

#else /* CONFIG_CIFS_FSCACHE */
static inline
void cifs_fscache_fill_coherency(struct inode *inode,
				 struct cifs_fscache_inode_coherency_data *cd)
{
}

static inline int cifs_fscache_get_super_cookie(struct cifs_tcon *tcon) { return 0; }
static inline void cifs_fscache_release_super_cookie(struct cifs_tcon *tcon) {}

static inline void cifs_fscache_get_inode_cookie(struct inode *inode) {}
static inline void cifs_fscache_release_inode_cookie(struct inode *inode) {}
static inline void cifs_fscache_unuse_inode_cookie(struct inode *inode, bool update) {}
static inline struct fscache_cookie *cifs_inode_cookie(struct inode *inode) { return NULL; }
static inline void cifs_invalidate_cache(struct inode *inode, unsigned int flags) {}

static inline int cifs_fscache_query_occupancy(struct inode *inode,
					       pgoff_t first, unsigned int nr_pages,
					       pgoff_t *_data_first,
					       unsigned int *_data_nr_pages)
{
	*_data_first = ULONG_MAX;
	*_data_nr_pages = 0;
	return -ENOBUFS;
}

static inline int
cifs_readpage_from_fscache(struct inode *inode, struct page *page)
{
	return -ENOBUFS;
}

static inline
void cifs_readpage_to_fscache(struct inode *inode, struct page *page) {}

#endif /* CONFIG_CIFS_FSCACHE */

#endif /* _CIFS_FSCACHE_H */