1 /* SPDX-License-Identifier: LGPL-2.1 */
3 * fs/cifs/fscache.h - CIFS filesystem cache interface definitions
5 * Copyright (c) 2010 Novell, Inc.
6 * Authors(s): Suresh Jayaraman (sjayaraman@suse.de>
9 #ifndef _CIFS_FSCACHE_H
10 #define _CIFS_FSCACHE_H
12 #include <linux/fscache.h>
16 #ifdef CONFIG_CIFS_FSCACHE
19 * Auxiliary data attached to CIFS superblock within the cache
21 struct cifs_fscache_super_auxdata {
22 u64 resource_id; /* unique server resource id */
23 __le64 vol_create_time;
24 u32 vol_serial_number;
28 * Auxiliary data attached to CIFS inode within the cache
30 struct cifs_fscache_inode_auxdata {
31 u64 last_write_time_sec;
32 u64 last_change_time_sec;
33 u32 last_write_time_nsec;
34 u32 last_change_time_nsec;
41 extern struct fscache_netfs cifs_fscache_netfs;
42 extern const struct fscache_cookie_def cifs_fscache_server_index_def;
43 extern const struct fscache_cookie_def cifs_fscache_super_index_def;
44 extern const struct fscache_cookie_def cifs_fscache_inode_object_def;
46 extern int cifs_fscache_register(void);
47 extern void cifs_fscache_unregister(void);
52 extern void cifs_fscache_get_client_cookie(struct TCP_Server_Info *);
53 extern void cifs_fscache_release_client_cookie(struct TCP_Server_Info *);
54 extern void cifs_fscache_get_super_cookie(struct cifs_tcon *);
55 extern void cifs_fscache_release_super_cookie(struct cifs_tcon *);
57 extern void cifs_fscache_release_inode_cookie(struct inode *);
58 extern void cifs_fscache_set_inode_cookie(struct inode *, struct file *);
59 extern void cifs_fscache_reset_inode_cookie(struct inode *);
61 extern void __cifs_fscache_invalidate_page(struct page *, struct inode *);
62 extern int cifs_fscache_release_page(struct page *page, gfp_t gfp);
63 extern int __cifs_readpage_from_fscache(struct inode *, struct page *);
64 extern int __cifs_readpages_from_fscache(struct inode *,
65 struct address_space *,
68 extern void __cifs_fscache_readpages_cancel(struct inode *, struct list_head *);
70 extern void __cifs_readpage_to_fscache(struct inode *, struct page *);
72 static inline void cifs_fscache_invalidate_page(struct page *page,
75 if (PageFsCache(page))
76 __cifs_fscache_invalidate_page(page, inode);
79 static inline int cifs_readpage_from_fscache(struct inode *inode,
82 if (CIFS_I(inode)->fscache)
83 return __cifs_readpage_from_fscache(inode, page);
88 static inline int cifs_readpages_from_fscache(struct inode *inode,
89 struct address_space *mapping,
90 struct list_head *pages,
93 if (CIFS_I(inode)->fscache)
94 return __cifs_readpages_from_fscache(inode, mapping, pages,
99 static inline void cifs_readpage_to_fscache(struct inode *inode,
102 if (PageFsCache(page))
103 __cifs_readpage_to_fscache(inode, page);
106 static inline void cifs_fscache_readpages_cancel(struct inode *inode,
107 struct list_head *pages)
109 if (CIFS_I(inode)->fscache)
110 return __cifs_fscache_readpages_cancel(inode, pages);
113 #else /* CONFIG_CIFS_FSCACHE */
114 static inline int cifs_fscache_register(void) { return 0; }
115 static inline void cifs_fscache_unregister(void) {}
118 cifs_fscache_get_client_cookie(struct TCP_Server_Info *server) {}
120 cifs_fscache_release_client_cookie(struct TCP_Server_Info *server) {}
121 static inline void cifs_fscache_get_super_cookie(struct cifs_tcon *tcon) {}
123 cifs_fscache_release_super_cookie(struct cifs_tcon *tcon) {}
125 static inline void cifs_fscache_release_inode_cookie(struct inode *inode) {}
126 static inline void cifs_fscache_set_inode_cookie(struct inode *inode,
127 struct file *filp) {}
128 static inline void cifs_fscache_reset_inode_cookie(struct inode *inode) {}
129 static inline int cifs_fscache_release_page(struct page *page, gfp_t gfp)
131 return 1; /* May release page */
134 static inline void cifs_fscache_invalidate_page(struct page *page,
135 struct inode *inode) {}
137 cifs_readpage_from_fscache(struct inode *inode, struct page *page)
142 static inline int cifs_readpages_from_fscache(struct inode *inode,
143 struct address_space *mapping,
144 struct list_head *pages,
150 static inline void cifs_readpage_to_fscache(struct inode *inode,
151 struct page *page) {}
153 static inline void cifs_fscache_readpages_cancel(struct inode *inode,
154 struct list_head *pages)
158 #endif /* CONFIG_CIFS_FSCACHE */
160 #endif /* _CIFS_FSCACHE_H */