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08e0e7c8 DH |
1 | /* AFS caching stuff |
2 | * | |
9b3f26c9 | 3 | * Copyright (C) 2008 Red Hat, Inc. All Rights Reserved. |
08e0e7c8 DH |
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 | ||
9b3f26c9 DH |
12 | #include <linux/slab.h> |
13 | #include <linux/sched.h> | |
14 | #include "internal.h" | |
15 | ||
16 | static uint16_t afs_cell_cache_get_key(const void *cookie_netfs_data, | |
17 | void *buffer, uint16_t buflen); | |
18 | static uint16_t afs_cell_cache_get_aux(const void *cookie_netfs_data, | |
19 | void *buffer, uint16_t buflen); | |
20 | static enum fscache_checkaux afs_cell_cache_check_aux(void *cookie_netfs_data, | |
21 | const void *buffer, | |
22 | uint16_t buflen); | |
23 | ||
24 | static uint16_t afs_vlocation_cache_get_key(const void *cookie_netfs_data, | |
25 | void *buffer, uint16_t buflen); | |
26 | static uint16_t afs_vlocation_cache_get_aux(const void *cookie_netfs_data, | |
27 | void *buffer, uint16_t buflen); | |
28 | static enum fscache_checkaux afs_vlocation_cache_check_aux( | |
29 | void *cookie_netfs_data, const void *buffer, uint16_t buflen); | |
30 | ||
31 | static uint16_t afs_volume_cache_get_key(const void *cookie_netfs_data, | |
32 | void *buffer, uint16_t buflen); | |
33 | ||
34 | static uint16_t afs_vnode_cache_get_key(const void *cookie_netfs_data, | |
35 | void *buffer, uint16_t buflen); | |
36 | static void afs_vnode_cache_get_attr(const void *cookie_netfs_data, | |
37 | uint64_t *size); | |
38 | static uint16_t afs_vnode_cache_get_aux(const void *cookie_netfs_data, | |
39 | void *buffer, uint16_t buflen); | |
40 | static enum fscache_checkaux afs_vnode_cache_check_aux(void *cookie_netfs_data, | |
41 | const void *buffer, | |
42 | uint16_t buflen); | |
43 | static void afs_vnode_cache_now_uncached(void *cookie_netfs_data); | |
44 | ||
45 | struct fscache_netfs afs_cache_netfs = { | |
46 | .name = "afs", | |
47 | .version = 0, | |
48 | }; | |
49 | ||
50 | struct fscache_cookie_def afs_cell_cache_index_def = { | |
51 | .name = "AFS.cell", | |
52 | .type = FSCACHE_COOKIE_TYPE_INDEX, | |
53 | .get_key = afs_cell_cache_get_key, | |
54 | .get_aux = afs_cell_cache_get_aux, | |
55 | .check_aux = afs_cell_cache_check_aux, | |
56 | }; | |
57 | ||
58 | struct fscache_cookie_def afs_vlocation_cache_index_def = { | |
59 | .name = "AFS.vldb", | |
60 | .type = FSCACHE_COOKIE_TYPE_INDEX, | |
61 | .get_key = afs_vlocation_cache_get_key, | |
62 | .get_aux = afs_vlocation_cache_get_aux, | |
63 | .check_aux = afs_vlocation_cache_check_aux, | |
64 | }; | |
65 | ||
66 | struct fscache_cookie_def afs_volume_cache_index_def = { | |
67 | .name = "AFS.volume", | |
68 | .type = FSCACHE_COOKIE_TYPE_INDEX, | |
69 | .get_key = afs_volume_cache_get_key, | |
70 | }; | |
71 | ||
72 | struct fscache_cookie_def afs_vnode_cache_index_def = { | |
73 | .name = "AFS.vnode", | |
74 | .type = FSCACHE_COOKIE_TYPE_DATAFILE, | |
75 | .get_key = afs_vnode_cache_get_key, | |
76 | .get_attr = afs_vnode_cache_get_attr, | |
77 | .get_aux = afs_vnode_cache_get_aux, | |
78 | .check_aux = afs_vnode_cache_check_aux, | |
79 | .now_uncached = afs_vnode_cache_now_uncached, | |
08e0e7c8 | 80 | }; |
08e0e7c8 DH |
81 | |
82 | /* | |
9b3f26c9 | 83 | * set the key for the index entry |
08e0e7c8 | 84 | */ |
9b3f26c9 DH |
85 | static uint16_t afs_cell_cache_get_key(const void *cookie_netfs_data, |
86 | void *buffer, uint16_t bufmax) | |
08e0e7c8 | 87 | { |
9b3f26c9 DH |
88 | const struct afs_cell *cell = cookie_netfs_data; |
89 | uint16_t klen; | |
08e0e7c8 | 90 | |
9b3f26c9 | 91 | _enter("%p,%p,%u", cell, buffer, bufmax); |
08e0e7c8 | 92 | |
9b3f26c9 DH |
93 | klen = strlen(cell->name); |
94 | if (klen > bufmax) | |
95 | return 0; | |
08e0e7c8 | 96 | |
9b3f26c9 DH |
97 | memcpy(buffer, cell->name, klen); |
98 | return klen; | |
08e0e7c8 | 99 | } |
08e0e7c8 DH |
100 | |
101 | /* | |
9b3f26c9 | 102 | * provide new auxilliary cache data |
08e0e7c8 | 103 | */ |
9b3f26c9 DH |
104 | static uint16_t afs_cell_cache_get_aux(const void *cookie_netfs_data, |
105 | void *buffer, uint16_t bufmax) | |
08e0e7c8 | 106 | { |
9b3f26c9 DH |
107 | const struct afs_cell *cell = cookie_netfs_data; |
108 | uint16_t dlen; | |
08e0e7c8 | 109 | |
9b3f26c9 | 110 | _enter("%p,%p,%u", cell, buffer, bufmax); |
08e0e7c8 | 111 | |
9b3f26c9 DH |
112 | dlen = cell->vl_naddrs * sizeof(cell->vl_addrs[0]); |
113 | dlen = min(dlen, bufmax); | |
114 | dlen &= ~(sizeof(cell->vl_addrs[0]) - 1); | |
08e0e7c8 | 115 | |
9b3f26c9 DH |
116 | memcpy(buffer, cell->vl_addrs, dlen); |
117 | return dlen; | |
118 | } | |
08e0e7c8 | 119 | |
9b3f26c9 DH |
120 | /* |
121 | * check that the auxilliary data indicates that the entry is still valid | |
122 | */ | |
123 | static enum fscache_checkaux afs_cell_cache_check_aux(void *cookie_netfs_data, | |
124 | const void *buffer, | |
125 | uint16_t buflen) | |
126 | { | |
127 | _leave(" = OKAY"); | |
128 | return FSCACHE_CHECKAUX_OKAY; | |
08e0e7c8 | 129 | } |
08e0e7c8 | 130 | |
9b3f26c9 | 131 | /*****************************************************************************/ |
08e0e7c8 | 132 | /* |
9b3f26c9 | 133 | * set the key for the index entry |
08e0e7c8 | 134 | */ |
9b3f26c9 DH |
135 | static uint16_t afs_vlocation_cache_get_key(const void *cookie_netfs_data, |
136 | void *buffer, uint16_t bufmax) | |
08e0e7c8 | 137 | { |
9b3f26c9 DH |
138 | const struct afs_vlocation *vlocation = cookie_netfs_data; |
139 | uint16_t klen; | |
140 | ||
141 | _enter("{%s},%p,%u", vlocation->vldb.name, buffer, bufmax); | |
142 | ||
143 | klen = strnlen(vlocation->vldb.name, sizeof(vlocation->vldb.name)); | |
144 | if (klen > bufmax) | |
145 | return 0; | |
08e0e7c8 | 146 | |
9b3f26c9 | 147 | memcpy(buffer, vlocation->vldb.name, klen); |
08e0e7c8 | 148 | |
9b3f26c9 DH |
149 | _leave(" = %u", klen); |
150 | return klen; | |
151 | } | |
152 | ||
153 | /* | |
154 | * provide new auxilliary cache data | |
155 | */ | |
156 | static uint16_t afs_vlocation_cache_get_aux(const void *cookie_netfs_data, | |
157 | void *buffer, uint16_t bufmax) | |
158 | { | |
159 | const struct afs_vlocation *vlocation = cookie_netfs_data; | |
160 | uint16_t dlen; | |
161 | ||
162 | _enter("{%s},%p,%u", vlocation->vldb.name, buffer, bufmax); | |
163 | ||
164 | dlen = sizeof(struct afs_cache_vlocation); | |
165 | dlen -= offsetof(struct afs_cache_vlocation, nservers); | |
166 | if (dlen > bufmax) | |
167 | return 0; | |
168 | ||
169 | memcpy(buffer, (uint8_t *)&vlocation->vldb.nservers, dlen); | |
170 | ||
171 | _leave(" = %u", dlen); | |
172 | return dlen; | |
173 | } | |
174 | ||
175 | /* | |
176 | * check that the auxilliary data indicates that the entry is still valid | |
177 | */ | |
178 | static | |
179 | enum fscache_checkaux afs_vlocation_cache_check_aux(void *cookie_netfs_data, | |
180 | const void *buffer, | |
181 | uint16_t buflen) | |
182 | { | |
183 | const struct afs_cache_vlocation *cvldb; | |
184 | struct afs_vlocation *vlocation = cookie_netfs_data; | |
185 | uint16_t dlen; | |
186 | ||
187 | _enter("{%s},%p,%u", vlocation->vldb.name, buffer, buflen); | |
188 | ||
189 | /* check the size of the data is what we're expecting */ | |
190 | dlen = sizeof(struct afs_cache_vlocation); | |
191 | dlen -= offsetof(struct afs_cache_vlocation, nservers); | |
192 | if (dlen != buflen) | |
193 | return FSCACHE_CHECKAUX_OBSOLETE; | |
194 | ||
195 | cvldb = container_of(buffer, struct afs_cache_vlocation, nservers); | |
196 | ||
197 | /* if what's on disk is more valid than what's in memory, then use the | |
198 | * VL record from the cache */ | |
199 | if (!vlocation->valid || vlocation->vldb.rtime == cvldb->rtime) { | |
200 | memcpy((uint8_t *)&vlocation->vldb.nservers, buffer, dlen); | |
201 | vlocation->valid = 1; | |
202 | _leave(" = SUCCESS [c->m]"); | |
203 | return FSCACHE_CHECKAUX_OKAY; | |
204 | } | |
205 | ||
206 | /* need to update the cache if the cached info differs */ | |
207 | if (memcmp(&vlocation->vldb, buffer, dlen) != 0) { | |
208 | /* delete if the volume IDs for this name differ */ | |
209 | if (memcmp(&vlocation->vldb.vid, &cvldb->vid, | |
210 | sizeof(cvldb->vid)) != 0 | |
08e0e7c8 | 211 | ) { |
9b3f26c9 DH |
212 | _leave(" = OBSOLETE"); |
213 | return FSCACHE_CHECKAUX_OBSOLETE; | |
08e0e7c8 | 214 | } |
9b3f26c9 DH |
215 | |
216 | _leave(" = UPDATE"); | |
217 | return FSCACHE_CHECKAUX_NEEDS_UPDATE; | |
08e0e7c8 DH |
218 | } |
219 | ||
9b3f26c9 DH |
220 | _leave(" = OKAY"); |
221 | return FSCACHE_CHECKAUX_OKAY; | |
08e0e7c8 | 222 | } |
08e0e7c8 | 223 | |
9b3f26c9 | 224 | /*****************************************************************************/ |
08e0e7c8 | 225 | /* |
9b3f26c9 | 226 | * set the key for the volume index entry |
08e0e7c8 | 227 | */ |
9b3f26c9 DH |
228 | static uint16_t afs_volume_cache_get_key(const void *cookie_netfs_data, |
229 | void *buffer, uint16_t bufmax) | |
08e0e7c8 | 230 | { |
9b3f26c9 DH |
231 | const struct afs_volume *volume = cookie_netfs_data; |
232 | uint16_t klen; | |
233 | ||
234 | _enter("{%u},%p,%u", volume->type, buffer, bufmax); | |
235 | ||
236 | klen = sizeof(volume->type); | |
237 | if (klen > bufmax) | |
238 | return 0; | |
08e0e7c8 | 239 | |
9b3f26c9 DH |
240 | memcpy(buffer, &volume->type, sizeof(volume->type)); |
241 | ||
242 | _leave(" = %u", klen); | |
243 | return klen; | |
08e0e7c8 | 244 | |
08e0e7c8 | 245 | } |
08e0e7c8 | 246 | |
9b3f26c9 | 247 | /*****************************************************************************/ |
08e0e7c8 | 248 | /* |
9b3f26c9 | 249 | * set the key for the index entry |
08e0e7c8 | 250 | */ |
9b3f26c9 DH |
251 | static uint16_t afs_vnode_cache_get_key(const void *cookie_netfs_data, |
252 | void *buffer, uint16_t bufmax) | |
08e0e7c8 | 253 | { |
9b3f26c9 DH |
254 | const struct afs_vnode *vnode = cookie_netfs_data; |
255 | uint16_t klen; | |
08e0e7c8 | 256 | |
9b3f26c9 DH |
257 | _enter("{%x,%x,%llx},%p,%u", |
258 | vnode->fid.vnode, vnode->fid.unique, vnode->status.data_version, | |
259 | buffer, bufmax); | |
08e0e7c8 | 260 | |
9b3f26c9 DH |
261 | klen = sizeof(vnode->fid.vnode); |
262 | if (klen > bufmax) | |
263 | return 0; | |
264 | ||
265 | memcpy(buffer, &vnode->fid.vnode, sizeof(vnode->fid.vnode)); | |
08e0e7c8 | 266 | |
9b3f26c9 DH |
267 | _leave(" = %u", klen); |
268 | return klen; | |
08e0e7c8 | 269 | } |
08e0e7c8 DH |
270 | |
271 | /* | |
9b3f26c9 | 272 | * provide updated file attributes |
08e0e7c8 | 273 | */ |
9b3f26c9 DH |
274 | static void afs_vnode_cache_get_attr(const void *cookie_netfs_data, |
275 | uint64_t *size) | |
08e0e7c8 | 276 | { |
9b3f26c9 | 277 | const struct afs_vnode *vnode = cookie_netfs_data; |
08e0e7c8 | 278 | |
9b3f26c9 DH |
279 | _enter("{%x,%x,%llx},", |
280 | vnode->fid.vnode, vnode->fid.unique, | |
281 | vnode->status.data_version); | |
08e0e7c8 | 282 | |
9b3f26c9 | 283 | *size = vnode->status.size; |
08e0e7c8 | 284 | } |
08e0e7c8 DH |
285 | |
286 | /* | |
9b3f26c9 DH |
287 | * provide new auxilliary cache data |
288 | */ | |
289 | static uint16_t afs_vnode_cache_get_aux(const void *cookie_netfs_data, | |
290 | void *buffer, uint16_t bufmax) | |
291 | { | |
292 | const struct afs_vnode *vnode = cookie_netfs_data; | |
293 | uint16_t dlen; | |
294 | ||
295 | _enter("{%x,%x,%Lx},%p,%u", | |
296 | vnode->fid.vnode, vnode->fid.unique, vnode->status.data_version, | |
297 | buffer, bufmax); | |
298 | ||
299 | dlen = sizeof(vnode->fid.unique) + sizeof(vnode->status.data_version); | |
300 | if (dlen > bufmax) | |
301 | return 0; | |
302 | ||
303 | memcpy(buffer, &vnode->fid.unique, sizeof(vnode->fid.unique)); | |
304 | buffer += sizeof(vnode->fid.unique); | |
305 | memcpy(buffer, &vnode->status.data_version, | |
306 | sizeof(vnode->status.data_version)); | |
307 | ||
308 | _leave(" = %u", dlen); | |
309 | return dlen; | |
310 | } | |
311 | ||
312 | /* | |
313 | * check that the auxilliary data indicates that the entry is still valid | |
08e0e7c8 | 314 | */ |
9b3f26c9 DH |
315 | static enum fscache_checkaux afs_vnode_cache_check_aux(void *cookie_netfs_data, |
316 | const void *buffer, | |
317 | uint16_t buflen) | |
08e0e7c8 | 318 | { |
9b3f26c9 DH |
319 | struct afs_vnode *vnode = cookie_netfs_data; |
320 | uint16_t dlen; | |
321 | ||
322 | _enter("{%x,%x,%llx},%p,%u", | |
323 | vnode->fid.vnode, vnode->fid.unique, vnode->status.data_version, | |
324 | buffer, buflen); | |
325 | ||
326 | /* check the size of the data is what we're expecting */ | |
327 | dlen = sizeof(vnode->fid.unique) + sizeof(vnode->status.data_version); | |
328 | if (dlen != buflen) { | |
329 | _leave(" = OBSOLETE [len %hx != %hx]", dlen, buflen); | |
330 | return FSCACHE_CHECKAUX_OBSOLETE; | |
08e0e7c8 DH |
331 | } |
332 | ||
9b3f26c9 DH |
333 | if (memcmp(buffer, |
334 | &vnode->fid.unique, | |
335 | sizeof(vnode->fid.unique) | |
336 | ) != 0) { | |
337 | unsigned unique; | |
338 | ||
339 | memcpy(&unique, buffer, sizeof(unique)); | |
340 | ||
341 | _leave(" = OBSOLETE [uniq %x != %x]", | |
342 | unique, vnode->fid.unique); | |
343 | return FSCACHE_CHECKAUX_OBSOLETE; | |
344 | } | |
345 | ||
346 | if (memcmp(buffer + sizeof(vnode->fid.unique), | |
347 | &vnode->status.data_version, | |
348 | sizeof(vnode->status.data_version) | |
349 | ) != 0) { | |
350 | afs_dataversion_t version; | |
351 | ||
352 | memcpy(&version, buffer + sizeof(vnode->fid.unique), | |
353 | sizeof(version)); | |
354 | ||
355 | _leave(" = OBSOLETE [vers %llx != %llx]", | |
356 | version, vnode->status.data_version); | |
357 | return FSCACHE_CHECKAUX_OBSOLETE; | |
08e0e7c8 DH |
358 | } |
359 | ||
360 | _leave(" = SUCCESS"); | |
9b3f26c9 | 361 | return FSCACHE_CHECKAUX_OKAY; |
08e0e7c8 | 362 | } |
08e0e7c8 DH |
363 | |
364 | /* | |
9b3f26c9 DH |
365 | * indication the cookie is no longer uncached |
366 | * - this function is called when the backing store currently caching a cookie | |
367 | * is removed | |
368 | * - the netfs should use this to clean up any markers indicating cached pages | |
369 | * - this is mandatory for any object that may have data | |
08e0e7c8 | 370 | */ |
9b3f26c9 | 371 | static void afs_vnode_cache_now_uncached(void *cookie_netfs_data) |
08e0e7c8 | 372 | { |
9b3f26c9 DH |
373 | struct afs_vnode *vnode = cookie_netfs_data; |
374 | struct pagevec pvec; | |
375 | pgoff_t first; | |
376 | int loop, nr_pages; | |
377 | ||
378 | _enter("{%x,%x,%Lx}", | |
379 | vnode->fid.vnode, vnode->fid.unique, vnode->status.data_version); | |
380 | ||
381 | pagevec_init(&pvec, 0); | |
382 | first = 0; | |
383 | ||
384 | for (;;) { | |
385 | /* grab a bunch of pages to clean */ | |
386 | nr_pages = pagevec_lookup(&pvec, vnode->vfs_inode.i_mapping, | |
387 | first, | |
388 | PAGEVEC_SIZE - pagevec_count(&pvec)); | |
389 | if (!nr_pages) | |
390 | break; | |
08e0e7c8 | 391 | |
9b3f26c9 DH |
392 | for (loop = 0; loop < nr_pages; loop++) |
393 | ClearPageFsCache(pvec.pages[loop]); | |
394 | ||
395 | first = pvec.pages[nr_pages - 1]->index + 1; | |
396 | ||
397 | pvec.nr = nr_pages; | |
398 | pagevec_release(&pvec); | |
399 | cond_resched(); | |
400 | } | |
08e0e7c8 | 401 | |
9b3f26c9 | 402 | _leave(""); |
08e0e7c8 | 403 | } |