Merge branch 'linux-2.6' into for-2.6.22
[sfrench/cifs-2.6.git] / fs / afs / cache.c
1 /* AFS caching stuff
2  *
3  * Copyright (C) 2007 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 License
8  * as published by the Free Software Foundation; either version
9  * 2 of the License, or (at your option) any later version.
10  */
11
12 #ifdef AFS_CACHING_SUPPORT
13 static cachefs_match_val_t afs_cell_cache_match(void *target,
14                                                 const void *entry);
15 static void afs_cell_cache_update(void *source, void *entry);
16
17 struct cachefs_index_def afs_cache_cell_index_def = {
18         .name                   = "cell_ix",
19         .data_size              = sizeof(struct afs_cache_cell),
20         .keys[0]                = { CACHEFS_INDEX_KEYS_ASCIIZ, 64 },
21         .match                  = afs_cell_cache_match,
22         .update                 = afs_cell_cache_update,
23 };
24 #endif
25
26 /*
27  * match a cell record obtained from the cache
28  */
29 #ifdef AFS_CACHING_SUPPORT
30 static cachefs_match_val_t afs_cell_cache_match(void *target,
31                                                 const void *entry)
32 {
33         const struct afs_cache_cell *ccell = entry;
34         struct afs_cell *cell = target;
35
36         _enter("{%s},{%s}", ccell->name, cell->name);
37
38         if (strncmp(ccell->name, cell->name, sizeof(ccell->name)) == 0) {
39                 _leave(" = SUCCESS");
40                 return CACHEFS_MATCH_SUCCESS;
41         }
42
43         _leave(" = FAILED");
44         return CACHEFS_MATCH_FAILED;
45 }
46 #endif
47
48 /*
49  * update a cell record in the cache
50  */
51 #ifdef AFS_CACHING_SUPPORT
52 static void afs_cell_cache_update(void *source, void *entry)
53 {
54         struct afs_cache_cell *ccell = entry;
55         struct afs_cell *cell = source;
56
57         _enter("%p,%p", source, entry);
58
59         strncpy(ccell->name, cell->name, sizeof(ccell->name));
60
61         memcpy(ccell->vl_servers,
62                cell->vl_addrs,
63                min(sizeof(ccell->vl_servers), sizeof(cell->vl_addrs)));
64
65 }
66 #endif
67
68 #ifdef AFS_CACHING_SUPPORT
69 static cachefs_match_val_t afs_vlocation_cache_match(void *target,
70                                                      const void *entry);
71 static void afs_vlocation_cache_update(void *source, void *entry);
72
73 struct cachefs_index_def afs_vlocation_cache_index_def = {
74         .name           = "vldb",
75         .data_size      = sizeof(struct afs_cache_vlocation),
76         .keys[0]        = { CACHEFS_INDEX_KEYS_ASCIIZ, 64 },
77         .match          = afs_vlocation_cache_match,
78         .update         = afs_vlocation_cache_update,
79 };
80 #endif
81
82 /*
83  * match a VLDB record stored in the cache
84  * - may also load target from entry
85  */
86 #ifdef AFS_CACHING_SUPPORT
87 static cachefs_match_val_t afs_vlocation_cache_match(void *target,
88                                                      const void *entry)
89 {
90         const struct afs_cache_vlocation *vldb = entry;
91         struct afs_vlocation *vlocation = target;
92
93         _enter("{%s},{%s}", vlocation->vldb.name, vldb->name);
94
95         if (strncmp(vlocation->vldb.name, vldb->name, sizeof(vldb->name)) == 0
96             ) {
97                 if (!vlocation->valid ||
98                     vlocation->vldb.rtime == vldb->rtime
99                     ) {
100                         vlocation->vldb = *vldb;
101                         vlocation->valid = 1;
102                         _leave(" = SUCCESS [c->m]");
103                         return CACHEFS_MATCH_SUCCESS;
104                 } else if (memcmp(&vlocation->vldb, vldb, sizeof(*vldb)) != 0) {
105                         /* delete if VIDs for this name differ */
106                         if (memcmp(&vlocation->vldb.vid,
107                                    &vldb->vid,
108                                    sizeof(vldb->vid)) != 0) {
109                                 _leave(" = DELETE");
110                                 return CACHEFS_MATCH_SUCCESS_DELETE;
111                         }
112
113                         _leave(" = UPDATE");
114                         return CACHEFS_MATCH_SUCCESS_UPDATE;
115                 } else {
116                         _leave(" = SUCCESS");
117                         return CACHEFS_MATCH_SUCCESS;
118                 }
119         }
120
121         _leave(" = FAILED");
122         return CACHEFS_MATCH_FAILED;
123 }
124 #endif
125
126 /*
127  * update a VLDB record stored in the cache
128  */
129 #ifdef AFS_CACHING_SUPPORT
130 static void afs_vlocation_cache_update(void *source, void *entry)
131 {
132         struct afs_cache_vlocation *vldb = entry;
133         struct afs_vlocation *vlocation = source;
134
135         _enter("");
136
137         *vldb = vlocation->vldb;
138 }
139 #endif
140
141 #ifdef AFS_CACHING_SUPPORT
142 static cachefs_match_val_t afs_volume_cache_match(void *target,
143                                                   const void *entry);
144 static void afs_volume_cache_update(void *source, void *entry);
145
146 struct cachefs_index_def afs_volume_cache_index_def = {
147         .name           = "volume",
148         .data_size      = sizeof(struct afs_cache_vhash),
149         .keys[0]        = { CACHEFS_INDEX_KEYS_BIN, 1 },
150         .keys[1]        = { CACHEFS_INDEX_KEYS_BIN, 1 },
151         .match          = afs_volume_cache_match,
152         .update         = afs_volume_cache_update,
153 };
154 #endif
155
156 /*
157  * match a volume hash record stored in the cache
158  */
159 #ifdef AFS_CACHING_SUPPORT
160 static cachefs_match_val_t afs_volume_cache_match(void *target,
161                                                   const void *entry)
162 {
163         const struct afs_cache_vhash *vhash = entry;
164         struct afs_volume *volume = target;
165
166         _enter("{%u},{%u}", volume->type, vhash->vtype);
167
168         if (volume->type == vhash->vtype) {
169                 _leave(" = SUCCESS");
170                 return CACHEFS_MATCH_SUCCESS;
171         }
172
173         _leave(" = FAILED");
174         return CACHEFS_MATCH_FAILED;
175 }
176 #endif
177
178 /*
179  * update a volume hash record stored in the cache
180  */
181 #ifdef AFS_CACHING_SUPPORT
182 static void afs_volume_cache_update(void *source, void *entry)
183 {
184         struct afs_cache_vhash *vhash = entry;
185         struct afs_volume *volume = source;
186
187         _enter("");
188
189         vhash->vtype = volume->type;
190 }
191 #endif
192
193 #ifdef AFS_CACHING_SUPPORT
194 static cachefs_match_val_t afs_vnode_cache_match(void *target,
195                                                  const void *entry);
196 static void afs_vnode_cache_update(void *source, void *entry);
197
198 struct cachefs_index_def afs_vnode_cache_index_def = {
199         .name           = "vnode",
200         .data_size      = sizeof(struct afs_cache_vnode),
201         .keys[0]        = { CACHEFS_INDEX_KEYS_BIN, 4 },
202         .match          = afs_vnode_cache_match,
203         .update         = afs_vnode_cache_update,
204 };
205 #endif
206
207 /*
208  * match a vnode record stored in the cache
209  */
210 #ifdef AFS_CACHING_SUPPORT
211 static cachefs_match_val_t afs_vnode_cache_match(void *target,
212                                                  const void *entry)
213 {
214         const struct afs_cache_vnode *cvnode = entry;
215         struct afs_vnode *vnode = target;
216
217         _enter("{%x,%x,%Lx},{%x,%x,%Lx}",
218                vnode->fid.vnode,
219                vnode->fid.unique,
220                vnode->status.version,
221                cvnode->vnode_id,
222                cvnode->vnode_unique,
223                cvnode->data_version);
224
225         if (vnode->fid.vnode != cvnode->vnode_id) {
226                 _leave(" = FAILED");
227                 return CACHEFS_MATCH_FAILED;
228         }
229
230         if (vnode->fid.unique != cvnode->vnode_unique ||
231             vnode->status.version != cvnode->data_version) {
232                 _leave(" = DELETE");
233                 return CACHEFS_MATCH_SUCCESS_DELETE;
234         }
235
236         _leave(" = SUCCESS");
237         return CACHEFS_MATCH_SUCCESS;
238 }
239 #endif
240
241 /*
242  * update a vnode record stored in the cache
243  */
244 #ifdef AFS_CACHING_SUPPORT
245 static void afs_vnode_cache_update(void *source, void *entry)
246 {
247         struct afs_cache_vnode *cvnode = entry;
248         struct afs_vnode *vnode = source;
249
250         _enter("");
251
252         cvnode->vnode_id        = vnode->fid.vnode;
253         cvnode->vnode_unique    = vnode->fid.unique;
254         cvnode->data_version    = vnode->status.version;
255 }
256 #endif