1 /* NFS filesystem cache interface definitions
3 * Copyright (C) 2008 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public Licence
8 * as published by the Free Software Foundation; either version
9 * 2 of the Licence, or (at your option) any later version.
12 #ifndef _NFS_FSCACHE_H
13 #define _NFS_FSCACHE_H
15 #include <linux/nfs_fs.h>
16 #include <linux/nfs_mount.h>
17 #include <linux/nfs4_mount.h>
18 #include <linux/fscache.h>
20 #ifdef CONFIG_NFS_FSCACHE
23 * set of NFS FS-Cache objects that form a superblock key
25 struct nfs_fscache_key
{
27 struct nfs_client
*nfs_client
; /* the server */
29 /* the elements of the unique key - as used by nfs_compare_super() and
30 * nfs_compare_mount_options() to distinguish superblocks */
33 unsigned long s_flags
; /* various flags
40 unsigned int rsize
; /* read size */
41 unsigned int wsize
; /* write size */
42 unsigned int acregmin
; /* attr cache timeouts */
43 unsigned int acregmax
;
44 unsigned int acdirmin
;
45 unsigned int acdirmax
;
49 rpc_authflavor_t au_flavor
;
52 /* uniquifier - can be used if nfs_server.flags includes
53 * NFS_MOUNT_UNSHARED */
62 extern struct fscache_netfs nfs_fscache_netfs
;
63 extern const struct fscache_cookie_def nfs_fscache_server_index_def
;
64 extern const struct fscache_cookie_def nfs_fscache_super_index_def
;
65 extern const struct fscache_cookie_def nfs_fscache_inode_object_def
;
67 extern int nfs_fscache_register(void);
68 extern void nfs_fscache_unregister(void);
73 extern void nfs_fscache_get_client_cookie(struct nfs_client
*);
74 extern void nfs_fscache_release_client_cookie(struct nfs_client
*);
76 extern void nfs_fscache_get_super_cookie(struct super_block
*,
77 struct nfs_parsed_mount_data
*);
78 extern void nfs_fscache_release_super_cookie(struct super_block
*);
80 extern void nfs_fscache_init_inode_cookie(struct inode
*);
81 extern void nfs_fscache_release_inode_cookie(struct inode
*);
82 extern void nfs_fscache_zap_inode_cookie(struct inode
*);
83 extern void nfs_fscache_set_inode_cookie(struct inode
*, struct file
*);
84 extern void nfs_fscache_reset_inode_cookie(struct inode
*);
86 extern void __nfs_fscache_invalidate_page(struct page
*, struct inode
*);
87 extern int nfs_fscache_release_page(struct page
*, gfp_t
);
90 * wait for a page to complete writing to the cache
92 static inline void nfs_fscache_wait_on_page_write(struct nfs_inode
*nfsi
,
95 if (PageFsCache(page
))
96 fscache_wait_on_page_write(nfsi
->fscache
, page
);
100 * release the caching state associated with a page if undergoing complete page
103 static inline void nfs_fscache_invalidate_page(struct page
*page
,
106 if (PageFsCache(page
))
107 __nfs_fscache_invalidate_page(page
, inode
);
111 #else /* CONFIG_NFS_FSCACHE */
112 static inline int nfs_fscache_register(void) { return 0; }
113 static inline void nfs_fscache_unregister(void) {}
115 static inline void nfs_fscache_get_client_cookie(struct nfs_client
*clp
) {}
116 static inline void nfs_fscache_release_client_cookie(struct nfs_client
*clp
) {}
118 static inline void nfs_fscache_get_super_cookie(
119 struct super_block
*sb
,
120 struct nfs_parsed_mount_data
*data
)
123 static inline void nfs_fscache_release_super_cookie(struct super_block
*sb
) {}
125 static inline void nfs_fscache_init_inode_cookie(struct inode
*inode
) {}
126 static inline void nfs_fscache_release_inode_cookie(struct inode
*inode
) {}
127 static inline void nfs_fscache_zap_inode_cookie(struct inode
*inode
) {}
128 static inline void nfs_fscache_set_inode_cookie(struct inode
*inode
,
129 struct file
*filp
) {}
130 static inline void nfs_fscache_reset_inode_cookie(struct inode
*inode
) {}
132 static inline int nfs_fscache_release_page(struct page
*page
, gfp_t gfp
)
134 return 1; /* True: may release page */
136 static inline void nfs_fscache_invalidate_page(struct page
*page
,
137 struct inode
*inode
) {}
138 static inline void nfs_fscache_wait_on_page_write(struct nfs_inode
*nfsi
,
139 struct page
*page
) {}
141 #endif /* CONFIG_NFS_FSCACHE */
142 #endif /* _NFS_FSCACHE_H */