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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
22
23
24
25struct nfs_fscache_key {
26 struct rb_node node;
27 struct nfs_client *nfs_client;
28
29
30
31 struct {
32 struct {
33 unsigned long s_flags;
34
35 } super;
36
37 struct {
38 struct nfs_fsid fsid;
39 int flags;
40 unsigned int rsize;
41 unsigned int wsize;
42 unsigned int acregmin;
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
53
54 u8 uniq_len;
55 char uniquifier[0];
56 } key;
57};
58
59
60
61
62extern struct fscache_netfs nfs_fscache_netfs;
63extern const struct fscache_cookie_def nfs_fscache_server_index_def;
64extern const struct fscache_cookie_def nfs_fscache_super_index_def;
65extern const struct fscache_cookie_def nfs_fscache_inode_object_def;
66
67extern int nfs_fscache_register(void);
68extern void nfs_fscache_unregister(void);
69
70
71
72
73extern void nfs_fscache_get_client_cookie(struct nfs_client *);
74extern void nfs_fscache_release_client_cookie(struct nfs_client *);
75
76extern void nfs_fscache_get_super_cookie(struct super_block *, const char *, int);
77extern void nfs_fscache_release_super_cookie(struct super_block *);
78
79extern void nfs_fscache_init_inode_cookie(struct inode *);
80extern void nfs_fscache_release_inode_cookie(struct inode *);
81extern void nfs_fscache_zap_inode_cookie(struct inode *);
82extern void nfs_fscache_set_inode_cookie(struct inode *, struct file *);
83extern void nfs_fscache_reset_inode_cookie(struct inode *);
84
85extern void __nfs_fscache_invalidate_page(struct page *, struct inode *);
86extern int nfs_fscache_release_page(struct page *, gfp_t);
87
88extern int __nfs_readpage_from_fscache(struct nfs_open_context *,
89 struct inode *, struct page *);
90extern int __nfs_readpages_from_fscache(struct nfs_open_context *,
91 struct inode *, struct address_space *,
92 struct list_head *, unsigned *);
93extern void __nfs_readpage_to_fscache(struct inode *, struct page *, int);
94
95
96
97
98static inline void nfs_fscache_wait_on_page_write(struct nfs_inode *nfsi,
99 struct page *page)
100{
101 if (PageFsCache(page))
102 fscache_wait_on_page_write(nfsi->fscache, page);
103}
104
105
106
107
108
109static inline void nfs_fscache_invalidate_page(struct page *page,
110 struct inode *inode)
111{
112 if (PageFsCache(page))
113 __nfs_fscache_invalidate_page(page, inode);
114}
115
116
117
118
119static inline int nfs_readpage_from_fscache(struct nfs_open_context *ctx,
120 struct inode *inode,
121 struct page *page)
122{
123 if (NFS_I(inode)->fscache)
124 return __nfs_readpage_from_fscache(ctx, inode, page);
125 return -ENOBUFS;
126}
127
128
129
130
131static inline int nfs_readpages_from_fscache(struct nfs_open_context *ctx,
132 struct inode *inode,
133 struct address_space *mapping,
134 struct list_head *pages,
135 unsigned *nr_pages)
136{
137 if (NFS_I(inode)->fscache)
138 return __nfs_readpages_from_fscache(ctx, inode, mapping, pages,
139 nr_pages);
140 return -ENOBUFS;
141}
142
143
144
145
146
147static inline void nfs_readpage_to_fscache(struct inode *inode,
148 struct page *page,
149 int sync)
150{
151 if (PageFsCache(page))
152 __nfs_readpage_to_fscache(inode, page, sync);
153}
154
155
156
157
158static inline void nfs_fscache_invalidate(struct inode *inode)
159{
160 fscache_invalidate(NFS_I(inode)->fscache);
161}
162
163
164
165
166static inline void nfs_fscache_wait_on_invalidate(struct inode *inode)
167{
168 fscache_wait_on_invalidate(NFS_I(inode)->fscache);
169}
170
171
172
173
174static inline const char *nfs_server_fscache_state(struct nfs_server *server)
175{
176 if (server->fscache && (server->options & NFS_OPTION_FSCACHE))
177 return "yes";
178 return "no ";
179}
180
181#else
182static inline int nfs_fscache_register(void) { return 0; }
183static inline void nfs_fscache_unregister(void) {}
184
185static inline void nfs_fscache_get_client_cookie(struct nfs_client *clp) {}
186static inline void nfs_fscache_release_client_cookie(struct nfs_client *clp) {}
187
188static inline void nfs_fscache_release_super_cookie(struct super_block *sb) {}
189
190static inline void nfs_fscache_init_inode_cookie(struct inode *inode) {}
191static inline void nfs_fscache_release_inode_cookie(struct inode *inode) {}
192static inline void nfs_fscache_zap_inode_cookie(struct inode *inode) {}
193static inline void nfs_fscache_set_inode_cookie(struct inode *inode,
194 struct file *filp) {}
195static inline void nfs_fscache_reset_inode_cookie(struct inode *inode) {}
196
197static inline int nfs_fscache_release_page(struct page *page, gfp_t gfp)
198{
199 return 1;
200}
201static inline void nfs_fscache_invalidate_page(struct page *page,
202 struct inode *inode) {}
203static inline void nfs_fscache_wait_on_page_write(struct nfs_inode *nfsi,
204 struct page *page) {}
205
206static inline int nfs_readpage_from_fscache(struct nfs_open_context *ctx,
207 struct inode *inode,
208 struct page *page)
209{
210 return -ENOBUFS;
211}
212static inline int nfs_readpages_from_fscache(struct nfs_open_context *ctx,
213 struct inode *inode,
214 struct address_space *mapping,
215 struct list_head *pages,
216 unsigned *nr_pages)
217{
218 return -ENOBUFS;
219}
220static inline void nfs_readpage_to_fscache(struct inode *inode,
221 struct page *page, int sync) {}
222
223
224static inline void nfs_fscache_invalidate(struct inode *inode) {}
225static inline void nfs_fscache_wait_on_invalidate(struct inode *inode) {}
226
227static inline const char *nfs_server_fscache_state(struct nfs_server *server)
228{
229 return "no ";
230}
231
232#endif
233#endif
234