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 */
20 struct 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 */
29 struct 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 */
41 extern int cifs_fscache_get_super_cookie(struct cifs_tcon *);
42 extern void cifs_fscache_release_super_cookie(struct cifs_tcon *);
43
44 extern void cifs_fscache_get_inode_cookie(struct inode *inode);
45 extern void cifs_fscache_release_inode_cookie(struct inode *);
46 extern void cifs_fscache_unuse_inode_cookie(struct inode *inode, bool update);
47
48 static inline
cifs_fscache_fill_coherency(struct inode * inode,struct cifs_fscache_inode_coherency_data * cd)49 void cifs_fscache_fill_coherency(struct inode *inode,
50 struct cifs_fscache_inode_coherency_data *cd)
51 {
52 struct cifsInodeInfo *cifsi = CIFS_I(inode);
53 struct timespec64 ctime = inode_get_ctime(inode);
54
55 memset(cd, 0, sizeof(*cd));
56 cd->last_write_time_sec = cpu_to_le64(cifsi->netfs.inode.i_mtime.tv_sec);
57 cd->last_write_time_nsec = cpu_to_le32(cifsi->netfs.inode.i_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
cifs_inode_cookie(struct inode * inode)63 static inline struct fscache_cookie *cifs_inode_cookie(struct inode *inode)
64 {
65 return netfs_i_cookie(&CIFS_I(inode)->netfs);
66 }
67
cifs_invalidate_cache(struct inode * inode,unsigned int flags)68 static 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);
73 fscache_invalidate(cifs_inode_cookie(inode), &cd,
74 i_size_read(inode), flags);
75 }
76
77 extern 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
cifs_fscache_query_occupancy(struct inode * inode,pgoff_t first,unsigned int nr_pages,pgoff_t * _data_first,unsigned int * _data_nr_pages)82 static 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
93 extern int __cifs_readpage_from_fscache(struct inode *pinode, struct page *ppage);
94 extern void __cifs_readahead_to_fscache(struct inode *pinode, loff_t pos, size_t len);
95
96
cifs_readpage_from_fscache(struct inode * inode,struct page * page)97 static 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(inode, page);
102 return -ENOBUFS;
103 }
104
cifs_readahead_to_fscache(struct inode * inode,loff_t pos,size_t len)105 static 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(inode, pos, len);
110 }
111
112 #else /* CONFIG_CIFS_FSCACHE */
113 static inline
cifs_fscache_fill_coherency(struct inode * inode,struct cifs_fscache_inode_coherency_data * cd)114 void cifs_fscache_fill_coherency(struct inode *inode,
115 struct cifs_fscache_inode_coherency_data *cd)
116 {
117 }
118
cifs_fscache_get_super_cookie(struct cifs_tcon * tcon)119 static inline int cifs_fscache_get_super_cookie(struct cifs_tcon *tcon) { return 0; }
cifs_fscache_release_super_cookie(struct cifs_tcon * tcon)120 static inline void cifs_fscache_release_super_cookie(struct cifs_tcon *tcon) {}
121
cifs_fscache_get_inode_cookie(struct inode * inode)122 static inline void cifs_fscache_get_inode_cookie(struct inode *inode) {}
cifs_fscache_release_inode_cookie(struct inode * inode)123 static inline void cifs_fscache_release_inode_cookie(struct inode *inode) {}
cifs_fscache_unuse_inode_cookie(struct inode * inode,bool update)124 static inline void cifs_fscache_unuse_inode_cookie(struct inode *inode, bool update) {}
cifs_inode_cookie(struct inode * inode)125 static inline struct fscache_cookie *cifs_inode_cookie(struct inode *inode) { return NULL; }
cifs_invalidate_cache(struct inode * inode,unsigned int flags)126 static inline void cifs_invalidate_cache(struct inode *inode, unsigned int flags) {}
127
cifs_fscache_query_occupancy(struct inode * inode,pgoff_t first,unsigned int nr_pages,pgoff_t * _data_first,unsigned int * _data_nr_pages)128 static inline int cifs_fscache_query_occupancy(struct inode *inode,
129 pgoff_t first, unsigned int nr_pages,
130 pgoff_t *_data_first,
131 unsigned int *_data_nr_pages)
132 {
133 *_data_first = ULONG_MAX;
134 *_data_nr_pages = 0;
135 return -ENOBUFS;
136 }
137
138 static inline int
cifs_readpage_from_fscache(struct inode * inode,struct page * page)139 cifs_readpage_from_fscache(struct inode *inode, struct page *page)
140 {
141 return -ENOBUFS;
142 }
143
144 static inline
cifs_readahead_to_fscache(struct inode * inode,loff_t pos,size_t len)145 void cifs_readahead_to_fscache(struct inode *inode, loff_t pos, size_t len) {}
146
147 #endif /* CONFIG_CIFS_FSCACHE */
148
149 #endif /* _CIFS_FSCACHE_H */
150