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 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
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
cifs_fscache_enabled(struct inode * inode)112 static 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 */
118 static inline
cifs_fscache_fill_coherency(struct inode * inode,struct cifs_fscache_inode_coherency_data * cd)119 void cifs_fscache_fill_coherency(struct inode *inode,
120 struct cifs_fscache_inode_coherency_data *cd)
121 {
122 }
123
cifs_fscache_get_super_cookie(struct cifs_tcon * tcon)124 static inline int cifs_fscache_get_super_cookie(struct cifs_tcon *tcon) { return 0; }
cifs_fscache_release_super_cookie(struct cifs_tcon * tcon)125 static inline void cifs_fscache_release_super_cookie(struct cifs_tcon *tcon) {}
126
cifs_fscache_get_inode_cookie(struct inode * inode)127 static inline void cifs_fscache_get_inode_cookie(struct inode *inode) {}
cifs_fscache_release_inode_cookie(struct inode * inode)128 static inline void cifs_fscache_release_inode_cookie(struct inode *inode) {}
cifs_fscache_unuse_inode_cookie(struct inode * inode,bool update)129 static inline void cifs_fscache_unuse_inode_cookie(struct inode *inode, bool update) {}
cifs_inode_cookie(struct inode * inode)130 static inline struct fscache_cookie *cifs_inode_cookie(struct inode *inode) { return NULL; }
cifs_invalidate_cache(struct inode * inode,unsigned int flags)131 static inline void cifs_invalidate_cache(struct inode *inode, unsigned int flags) {}
cifs_fscache_enabled(struct inode * inode)132 static inline bool cifs_fscache_enabled(struct inode *inode) { return false; }
133
cifs_fscache_query_occupancy(struct inode * inode,pgoff_t first,unsigned int nr_pages,pgoff_t * _data_first,unsigned int * _data_nr_pages)134 static 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
144 static inline int
cifs_readpage_from_fscache(struct inode * inode,struct page * page)145 cifs_readpage_from_fscache(struct inode *inode, struct page *page)
146 {
147 return -ENOBUFS;
148 }
149
150 static inline
cifs_readahead_to_fscache(struct inode * inode,loff_t pos,size_t len)151 void 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