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8ec442ae DH |
1 | /* NFS filesystem cache interface definitions |
2 | * | |
3 | * Copyright (C) 2008 Red Hat, Inc. All Rights Reserved. | |
4 | * Written by David Howells (dhowells@redhat.com) | |
5 | * | |
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. | |
10 | */ | |
11 | ||
12 | #ifndef _NFS_FSCACHE_H | |
13 | #define _NFS_FSCACHE_H | |
14 | ||
15 | #include <linux/nfs_fs.h> | |
16 | #include <linux/nfs_mount.h> | |
17 | #include <linux/nfs4_mount.h> | |
18 | #include <linux/fscache.h> | |
19 | ||
20 | #ifdef CONFIG_NFS_FSCACHE | |
21 | ||
08734048 DH |
22 | /* |
23 | * set of NFS FS-Cache objects that form a superblock key | |
24 | */ | |
25 | struct nfs_fscache_key { | |
26 | struct rb_node node; | |
27 | struct nfs_client *nfs_client; /* the server */ | |
28 | ||
29 | /* the elements of the unique key - as used by nfs_compare_super() and | |
30 | * nfs_compare_mount_options() to distinguish superblocks */ | |
31 | struct { | |
32 | struct { | |
33 | unsigned long s_flags; /* various flags | |
34 | * (& NFS_MS_MASK) */ | |
35 | } super; | |
36 | ||
37 | struct { | |
38 | struct nfs_fsid fsid; | |
39 | int 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; | |
46 | } nfs_server; | |
47 | ||
48 | struct { | |
49 | rpc_authflavor_t au_flavor; | |
50 | } rpc_auth; | |
51 | ||
52 | /* uniquifier - can be used if nfs_server.flags includes | |
53 | * NFS_MOUNT_UNSHARED */ | |
54 | u8 uniq_len; | |
55 | char uniquifier[0]; | |
56 | } key; | |
57 | }; | |
58 | ||
8ec442ae DH |
59 | /* |
60 | * fscache-index.c | |
61 | */ | |
62 | extern struct fscache_netfs nfs_fscache_netfs; | |
14727281 | 63 | extern const struct fscache_cookie_def nfs_fscache_server_index_def; |
08734048 | 64 | extern const struct fscache_cookie_def nfs_fscache_super_index_def; |
10329a5d | 65 | extern const struct fscache_cookie_def nfs_fscache_inode_object_def; |
8ec442ae DH |
66 | |
67 | extern int nfs_fscache_register(void); | |
68 | extern void nfs_fscache_unregister(void); | |
69 | ||
14727281 DH |
70 | /* |
71 | * fscache.c | |
72 | */ | |
73 | extern void nfs_fscache_get_client_cookie(struct nfs_client *); | |
74 | extern void nfs_fscache_release_client_cookie(struct nfs_client *); | |
75 | ||
08734048 DH |
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 *); | |
79 | ||
ef79c097 DH |
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 *); | |
85 | ||
545db45f DH |
86 | extern void __nfs_fscache_invalidate_page(struct page *, struct inode *); |
87 | extern int nfs_fscache_release_page(struct page *, gfp_t); | |
88 | ||
89 | /* | |
90 | * wait for a page to complete writing to the cache | |
91 | */ | |
92 | static inline void nfs_fscache_wait_on_page_write(struct nfs_inode *nfsi, | |
93 | struct page *page) | |
94 | { | |
95 | if (PageFsCache(page)) | |
96 | fscache_wait_on_page_write(nfsi->fscache, page); | |
97 | } | |
98 | ||
99 | /* | |
100 | * release the caching state associated with a page if undergoing complete page | |
101 | * invalidation | |
102 | */ | |
103 | static inline void nfs_fscache_invalidate_page(struct page *page, | |
104 | struct inode *inode) | |
105 | { | |
106 | if (PageFsCache(page)) | |
107 | __nfs_fscache_invalidate_page(page, inode); | |
108 | } | |
109 | ||
110 | ||
8ec442ae DH |
111 | #else /* CONFIG_NFS_FSCACHE */ |
112 | static inline int nfs_fscache_register(void) { return 0; } | |
113 | static inline void nfs_fscache_unregister(void) {} | |
114 | ||
14727281 DH |
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) {} | |
117 | ||
08734048 DH |
118 | static inline void nfs_fscache_get_super_cookie( |
119 | struct super_block *sb, | |
120 | struct nfs_parsed_mount_data *data) | |
121 | { | |
122 | } | |
123 | static inline void nfs_fscache_release_super_cookie(struct super_block *sb) {} | |
124 | ||
ef79c097 DH |
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) {} | |
131 | ||
545db45f DH |
132 | static inline int nfs_fscache_release_page(struct page *page, gfp_t gfp) |
133 | { | |
134 | return 1; /* True: may release page */ | |
135 | } | |
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) {} | |
140 | ||
8ec442ae DH |
141 | #endif /* CONFIG_NFS_FSCACHE */ |
142 | #endif /* _NFS_FSCACHE_H */ |