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12#include <linux/init.h>
13#include <linux/kernel.h>
14#include <linux/sched.h>
15#include <linux/mm.h>
16#include <linux/nfs_fs.h>
17#include <linux/nfs_fs_sb.h>
18#include <linux/in6.h>
19
20#include "internal.h"
21#include "fscache.h"
22
23#define NFSDBG_FACILITY NFSDBG_FSCACHE
24
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28
29
30struct fscache_netfs nfs_fscache_netfs = {
31 .name = "nfs",
32 .version = 0,
33};
34
35
36
37
38int nfs_fscache_register(void)
39{
40 return fscache_register_netfs(&nfs_fscache_netfs);
41}
42
43
44
45
46void nfs_fscache_unregister(void)
47{
48 fscache_unregister_netfs(&nfs_fscache_netfs);
49}
50
51
52
53
54struct nfs_server_key {
55 uint16_t nfsversion;
56 uint16_t family;
57 uint16_t port;
58 union {
59 struct in_addr ipv4_addr;
60 struct in6_addr ipv6_addr;
61 } addr[0];
62};
63
64
65
66
67
68static uint16_t nfs_server_get_key(const void *cookie_netfs_data,
69 void *buffer, uint16_t bufmax)
70{
71 const struct nfs_client *clp = cookie_netfs_data;
72 const struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) &clp->cl_addr;
73 const struct sockaddr_in *sin = (struct sockaddr_in *) &clp->cl_addr;
74 struct nfs_server_key *key = buffer;
75 uint16_t len = sizeof(struct nfs_server_key);
76
77 memset(key, 0, len);
78 key->nfsversion = clp->rpc_ops->version;
79 key->family = clp->cl_addr.ss_family;
80
81 switch (clp->cl_addr.ss_family) {
82 case AF_INET:
83 key->port = sin->sin_port;
84 key->addr[0].ipv4_addr = sin->sin_addr;
85 len += sizeof(key->addr[0].ipv4_addr);
86 break;
87
88 case AF_INET6:
89 key->port = sin6->sin6_port;
90 key->addr[0].ipv6_addr = sin6->sin6_addr;
91 len += sizeof(key->addr[0].ipv6_addr);
92 break;
93
94 default:
95 printk(KERN_WARNING "NFS: Unknown network family '%d'\n",
96 clp->cl_addr.ss_family);
97 len = 0;
98 break;
99 }
100
101 return len;
102}
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108
109const struct fscache_cookie_def nfs_fscache_server_index_def = {
110 .name = "NFS.server",
111 .type = FSCACHE_COOKIE_TYPE_INDEX,
112 .get_key = nfs_server_get_key,
113};
114
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116
117
118static uint16_t nfs_super_get_key(const void *cookie_netfs_data,
119 void *buffer, uint16_t bufmax)
120{
121 const struct nfs_fscache_key *key;
122 const struct nfs_server *nfss = cookie_netfs_data;
123 uint16_t len;
124
125 key = nfss->fscache_key;
126 len = sizeof(key->key) + key->key.uniq_len;
127 if (len > bufmax) {
128 len = 0;
129 } else {
130 memcpy(buffer, &key->key, sizeof(key->key));
131 memcpy(buffer + sizeof(key->key),
132 key->key.uniquifier, key->key.uniq_len);
133 }
134
135 return len;
136}
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142
143const struct fscache_cookie_def nfs_fscache_super_index_def = {
144 .name = "NFS.super",
145 .type = FSCACHE_COOKIE_TYPE_INDEX,
146 .get_key = nfs_super_get_key,
147};
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158struct nfs_fscache_inode_auxdata {
159 struct timespec mtime;
160 struct timespec ctime;
161 loff_t size;
162 u64 change_attr;
163};
164
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167
168static uint16_t nfs_fscache_inode_get_key(const void *cookie_netfs_data,
169 void *buffer, uint16_t bufmax)
170{
171 const struct nfs_inode *nfsi = cookie_netfs_data;
172 uint16_t nsize;
173
174
175 nsize = nfsi->fh.size;
176 memcpy(buffer, nfsi->fh.data, nsize);
177 return nsize;
178}
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185
186static void nfs_fscache_inode_get_attr(const void *cookie_netfs_data,
187 uint64_t *size)
188{
189 const struct nfs_inode *nfsi = cookie_netfs_data;
190
191 *size = nfsi->vfs_inode.i_size;
192}
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201
202static uint16_t nfs_fscache_inode_get_aux(const void *cookie_netfs_data,
203 void *buffer, uint16_t bufmax)
204{
205 struct nfs_fscache_inode_auxdata auxdata;
206 const struct nfs_inode *nfsi = cookie_netfs_data;
207
208 memset(&auxdata, 0, sizeof(auxdata));
209 auxdata.size = nfsi->vfs_inode.i_size;
210 auxdata.mtime = nfsi->vfs_inode.i_mtime;
211 auxdata.ctime = nfsi->vfs_inode.i_ctime;
212
213 if (NFS_SERVER(&nfsi->vfs_inode)->nfs_client->rpc_ops->version == 4)
214 auxdata.change_attr = nfsi->vfs_inode.i_version;
215
216 if (bufmax > sizeof(auxdata))
217 bufmax = sizeof(auxdata);
218
219 memcpy(buffer, &auxdata, bufmax);
220 return bufmax;
221}
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228
229static
230enum fscache_checkaux nfs_fscache_inode_check_aux(void *cookie_netfs_data,
231 const void *data,
232 uint16_t datalen)
233{
234 struct nfs_fscache_inode_auxdata auxdata;
235 struct nfs_inode *nfsi = cookie_netfs_data;
236
237 if (datalen != sizeof(auxdata))
238 return FSCACHE_CHECKAUX_OBSOLETE;
239
240 memset(&auxdata, 0, sizeof(auxdata));
241 auxdata.size = nfsi->vfs_inode.i_size;
242 auxdata.mtime = nfsi->vfs_inode.i_mtime;
243 auxdata.ctime = nfsi->vfs_inode.i_ctime;
244
245 if (NFS_SERVER(&nfsi->vfs_inode)->nfs_client->rpc_ops->version == 4)
246 auxdata.change_attr = nfsi->vfs_inode.i_version;
247
248 if (memcmp(data, &auxdata, datalen) != 0)
249 return FSCACHE_CHECKAUX_OBSOLETE;
250
251 return FSCACHE_CHECKAUX_OKAY;
252}
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260
261static void nfs_fscache_inode_now_uncached(void *cookie_netfs_data)
262{
263 struct nfs_inode *nfsi = cookie_netfs_data;
264 struct pagevec pvec;
265 pgoff_t first;
266 int loop, nr_pages;
267
268 pagevec_init(&pvec, 0);
269 first = 0;
270
271 dprintk("NFS: nfs_inode_now_uncached: nfs_inode 0x%p\n", nfsi);
272
273 for (;;) {
274
275 nr_pages = pagevec_lookup(&pvec,
276 nfsi->vfs_inode.i_mapping,
277 first,
278 PAGEVEC_SIZE - pagevec_count(&pvec));
279 if (!nr_pages)
280 break;
281
282 for (loop = 0; loop < nr_pages; loop++)
283 ClearPageFsCache(pvec.pages[loop]);
284
285 first = pvec.pages[nr_pages - 1]->index + 1;
286
287 pvec.nr = nr_pages;
288 pagevec_release(&pvec);
289 cond_resched();
290 }
291}
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300
301static void nfs_fh_get_context(void *cookie_netfs_data, void *context)
302{
303 get_nfs_open_context(context);
304}
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311static void nfs_fh_put_context(void *cookie_netfs_data, void *context)
312{
313 if (context)
314 put_nfs_open_context(context);
315}
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326const struct fscache_cookie_def nfs_fscache_inode_object_def = {
327 .name = "NFS.fh",
328 .type = FSCACHE_COOKIE_TYPE_DATAFILE,
329 .get_key = nfs_fscache_inode_get_key,
330 .get_attr = nfs_fscache_inode_get_attr,
331 .get_aux = nfs_fscache_inode_get_aux,
332 .check_aux = nfs_fscache_inode_check_aux,
333 .now_uncached = nfs_fscache_inode_now_uncached,
334 .get_context = nfs_fh_get_context,
335 .put_context = nfs_fh_put_context,
336};
337