David Howells | ec26815 | 2007-04-26 15:49:28 -0700 | [diff] [blame^] | 1 | /* volume location management |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | * |
| 3 | * Copyright (C) 2002 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 | #include <linux/kernel.h> |
| 13 | #include <linux/module.h> |
| 14 | #include <linux/init.h> |
| 15 | #include <linux/slab.h> |
| 16 | #include <linux/fs.h> |
| 17 | #include <linux/pagemap.h> |
| 18 | #include "volume.h" |
| 19 | #include "cell.h" |
| 20 | #include "cmservice.h" |
| 21 | #include "fsclient.h" |
| 22 | #include "vlclient.h" |
| 23 | #include "kafstimod.h" |
| 24 | #include <rxrpc/connection.h> |
| 25 | #include "internal.h" |
| 26 | |
| 27 | #define AFS_VLDB_TIMEOUT HZ*1000 |
| 28 | |
| 29 | static void afs_vlocation_update_timer(struct afs_timer *timer); |
| 30 | static void afs_vlocation_update_attend(struct afs_async_op *op); |
| 31 | static void afs_vlocation_update_discard(struct afs_async_op *op); |
| 32 | static void __afs_put_vlocation(struct afs_vlocation *vlocation); |
| 33 | |
| 34 | static void __afs_vlocation_timeout(struct afs_timer *timer) |
| 35 | { |
| 36 | struct afs_vlocation *vlocation = |
| 37 | list_entry(timer, struct afs_vlocation, timeout); |
| 38 | |
| 39 | _debug("VL TIMEOUT [%s{u=%d}]", |
| 40 | vlocation->vldb.name, atomic_read(&vlocation->usage)); |
| 41 | |
| 42 | afs_vlocation_do_timeout(vlocation); |
| 43 | } |
| 44 | |
| 45 | static const struct afs_timer_ops afs_vlocation_timer_ops = { |
| 46 | .timed_out = __afs_vlocation_timeout, |
| 47 | }; |
| 48 | |
| 49 | static const struct afs_timer_ops afs_vlocation_update_timer_ops = { |
| 50 | .timed_out = afs_vlocation_update_timer, |
| 51 | }; |
| 52 | |
| 53 | static const struct afs_async_op_ops afs_vlocation_update_op_ops = { |
| 54 | .attend = afs_vlocation_update_attend, |
| 55 | .discard = afs_vlocation_update_discard, |
| 56 | }; |
| 57 | |
| 58 | static LIST_HEAD(afs_vlocation_update_pendq); /* queue of VLs awaiting update */ |
| 59 | static struct afs_vlocation *afs_vlocation_update; /* VL currently being updated */ |
| 60 | static DEFINE_SPINLOCK(afs_vlocation_update_lock); /* lock guarding update queue */ |
| 61 | |
| 62 | #ifdef AFS_CACHING_SUPPORT |
| 63 | static cachefs_match_val_t afs_vlocation_cache_match(void *target, |
| 64 | const void *entry); |
| 65 | static void afs_vlocation_cache_update(void *source, void *entry); |
| 66 | |
| 67 | struct cachefs_index_def afs_vlocation_cache_index_def = { |
| 68 | .name = "vldb", |
| 69 | .data_size = sizeof(struct afs_cache_vlocation), |
| 70 | .keys[0] = { CACHEFS_INDEX_KEYS_ASCIIZ, 64 }, |
| 71 | .match = afs_vlocation_cache_match, |
| 72 | .update = afs_vlocation_cache_update, |
| 73 | }; |
| 74 | #endif |
| 75 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | /* |
| 77 | * iterate through the VL servers in a cell until one of them admits knowing |
| 78 | * about the volume in question |
| 79 | * - caller must have cell->vl_sem write-locked |
| 80 | */ |
| 81 | static int afs_vlocation_access_vl_by_name(struct afs_vlocation *vlocation, |
| 82 | const char *name, |
| 83 | unsigned namesz, |
| 84 | struct afs_cache_vlocation *vldb) |
| 85 | { |
| 86 | struct afs_server *server = NULL; |
| 87 | struct afs_cell *cell = vlocation->cell; |
| 88 | int count, ret; |
| 89 | |
| 90 | _enter("%s,%*.*s,%u", cell->name, namesz, namesz, name, namesz); |
| 91 | |
| 92 | ret = -ENOMEDIUM; |
| 93 | for (count = cell->vl_naddrs; count > 0; count--) { |
| 94 | _debug("CellServ[%hu]: %08x", |
| 95 | cell->vl_curr_svix, |
| 96 | cell->vl_addrs[cell->vl_curr_svix].s_addr); |
| 97 | |
| 98 | /* try and create a server */ |
| 99 | ret = afs_server_lookup(cell, |
| 100 | &cell->vl_addrs[cell->vl_curr_svix], |
| 101 | &server); |
| 102 | switch (ret) { |
| 103 | case 0: |
| 104 | break; |
| 105 | case -ENOMEM: |
| 106 | case -ENONET: |
| 107 | goto out; |
| 108 | default: |
| 109 | goto rotate; |
| 110 | } |
| 111 | |
| 112 | /* attempt to access the VL server */ |
| 113 | ret = afs_rxvl_get_entry_by_name(server, name, namesz, vldb); |
| 114 | switch (ret) { |
| 115 | case 0: |
| 116 | afs_put_server(server); |
| 117 | goto out; |
| 118 | case -ENOMEM: |
| 119 | case -ENONET: |
| 120 | case -ENETUNREACH: |
| 121 | case -EHOSTUNREACH: |
| 122 | case -ECONNREFUSED: |
| 123 | down_write(&server->sem); |
| 124 | if (server->vlserver) { |
| 125 | rxrpc_put_connection(server->vlserver); |
| 126 | server->vlserver = NULL; |
| 127 | } |
| 128 | up_write(&server->sem); |
| 129 | afs_put_server(server); |
| 130 | if (ret == -ENOMEM || ret == -ENONET) |
| 131 | goto out; |
| 132 | goto rotate; |
| 133 | case -ENOMEDIUM: |
| 134 | afs_put_server(server); |
| 135 | goto out; |
| 136 | default: |
| 137 | afs_put_server(server); |
| 138 | ret = -ENOMEDIUM; |
| 139 | goto rotate; |
| 140 | } |
| 141 | |
| 142 | /* rotate the server records upon lookup failure */ |
| 143 | rotate: |
| 144 | cell->vl_curr_svix++; |
| 145 | cell->vl_curr_svix %= cell->vl_naddrs; |
| 146 | } |
| 147 | |
David Howells | ec26815 | 2007-04-26 15:49:28 -0700 | [diff] [blame^] | 148 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | _leave(" = %d", ret); |
| 150 | return ret; |
David Howells | ec26815 | 2007-04-26 15:49:28 -0700 | [diff] [blame^] | 151 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 152 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | /* |
| 154 | * iterate through the VL servers in a cell until one of them admits knowing |
| 155 | * about the volume in question |
| 156 | * - caller must have cell->vl_sem write-locked |
| 157 | */ |
| 158 | static int afs_vlocation_access_vl_by_id(struct afs_vlocation *vlocation, |
| 159 | afs_volid_t volid, |
| 160 | afs_voltype_t voltype, |
| 161 | struct afs_cache_vlocation *vldb) |
| 162 | { |
| 163 | struct afs_server *server = NULL; |
| 164 | struct afs_cell *cell = vlocation->cell; |
| 165 | int count, ret; |
| 166 | |
| 167 | _enter("%s,%x,%d,", cell->name, volid, voltype); |
| 168 | |
| 169 | ret = -ENOMEDIUM; |
| 170 | for (count = cell->vl_naddrs; count > 0; count--) { |
| 171 | _debug("CellServ[%hu]: %08x", |
| 172 | cell->vl_curr_svix, |
| 173 | cell->vl_addrs[cell->vl_curr_svix].s_addr); |
| 174 | |
| 175 | /* try and create a server */ |
| 176 | ret = afs_server_lookup(cell, |
| 177 | &cell->vl_addrs[cell->vl_curr_svix], |
| 178 | &server); |
| 179 | switch (ret) { |
| 180 | case 0: |
| 181 | break; |
| 182 | case -ENOMEM: |
| 183 | case -ENONET: |
| 184 | goto out; |
| 185 | default: |
| 186 | goto rotate; |
| 187 | } |
| 188 | |
| 189 | /* attempt to access the VL server */ |
| 190 | ret = afs_rxvl_get_entry_by_id(server, volid, voltype, vldb); |
| 191 | switch (ret) { |
| 192 | case 0: |
| 193 | afs_put_server(server); |
| 194 | goto out; |
| 195 | case -ENOMEM: |
| 196 | case -ENONET: |
| 197 | case -ENETUNREACH: |
| 198 | case -EHOSTUNREACH: |
| 199 | case -ECONNREFUSED: |
| 200 | down_write(&server->sem); |
| 201 | if (server->vlserver) { |
| 202 | rxrpc_put_connection(server->vlserver); |
| 203 | server->vlserver = NULL; |
| 204 | } |
| 205 | up_write(&server->sem); |
| 206 | afs_put_server(server); |
| 207 | if (ret == -ENOMEM || ret == -ENONET) |
| 208 | goto out; |
| 209 | goto rotate; |
| 210 | case -ENOMEDIUM: |
| 211 | afs_put_server(server); |
| 212 | goto out; |
| 213 | default: |
| 214 | afs_put_server(server); |
| 215 | ret = -ENOMEDIUM; |
| 216 | goto rotate; |
| 217 | } |
| 218 | |
| 219 | /* rotate the server records upon lookup failure */ |
| 220 | rotate: |
| 221 | cell->vl_curr_svix++; |
| 222 | cell->vl_curr_svix %= cell->vl_naddrs; |
| 223 | } |
| 224 | |
David Howells | ec26815 | 2007-04-26 15:49:28 -0700 | [diff] [blame^] | 225 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 226 | _leave(" = %d", ret); |
| 227 | return ret; |
David Howells | ec26815 | 2007-04-26 15:49:28 -0700 | [diff] [blame^] | 228 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 229 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 230 | /* |
| 231 | * lookup volume location |
| 232 | * - caller must have cell->vol_sem write-locked |
| 233 | * - iterate through the VL servers in a cell until one of them admits knowing |
| 234 | * about the volume in question |
| 235 | * - lookup in the local cache if not able to find on the VL server |
| 236 | * - insert/update in the local cache if did get a VL response |
| 237 | */ |
| 238 | int afs_vlocation_lookup(struct afs_cell *cell, |
| 239 | const char *name, |
| 240 | unsigned namesz, |
| 241 | struct afs_vlocation **_vlocation) |
| 242 | { |
| 243 | struct afs_cache_vlocation vldb; |
| 244 | struct afs_vlocation *vlocation; |
| 245 | afs_voltype_t voltype; |
| 246 | afs_volid_t vid; |
| 247 | int active = 0, ret; |
| 248 | |
| 249 | _enter("{%s},%*.*s,%u,", cell->name, namesz, namesz, name, namesz); |
| 250 | |
| 251 | if (namesz > sizeof(vlocation->vldb.name)) { |
| 252 | _leave(" = -ENAMETOOLONG"); |
| 253 | return -ENAMETOOLONG; |
| 254 | } |
| 255 | |
| 256 | /* search the cell's active list first */ |
| 257 | list_for_each_entry(vlocation, &cell->vl_list, link) { |
| 258 | if (namesz < sizeof(vlocation->vldb.name) && |
| 259 | vlocation->vldb.name[namesz] != '\0') |
| 260 | continue; |
| 261 | |
| 262 | if (memcmp(vlocation->vldb.name, name, namesz) == 0) |
| 263 | goto found_in_memory; |
| 264 | } |
| 265 | |
| 266 | /* search the cell's graveyard list second */ |
| 267 | spin_lock(&cell->vl_gylock); |
| 268 | list_for_each_entry(vlocation, &cell->vl_graveyard, link) { |
| 269 | if (namesz < sizeof(vlocation->vldb.name) && |
| 270 | vlocation->vldb.name[namesz] != '\0') |
| 271 | continue; |
| 272 | |
| 273 | if (memcmp(vlocation->vldb.name, name, namesz) == 0) |
| 274 | goto found_in_graveyard; |
| 275 | } |
| 276 | spin_unlock(&cell->vl_gylock); |
| 277 | |
| 278 | /* not in the cell's in-memory lists - create a new record */ |
Panagiotis Issaris | f8314dc | 2006-09-27 01:49:37 -0700 | [diff] [blame] | 279 | vlocation = kzalloc(sizeof(struct afs_vlocation), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 280 | if (!vlocation) |
| 281 | return -ENOMEM; |
| 282 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 283 | atomic_set(&vlocation->usage, 1); |
| 284 | INIT_LIST_HEAD(&vlocation->link); |
| 285 | rwlock_init(&vlocation->lock); |
| 286 | memcpy(vlocation->vldb.name, name, namesz); |
| 287 | |
| 288 | afs_timer_init(&vlocation->timeout, &afs_vlocation_timer_ops); |
| 289 | afs_timer_init(&vlocation->upd_timer, &afs_vlocation_update_timer_ops); |
| 290 | afs_async_op_init(&vlocation->upd_op, &afs_vlocation_update_op_ops); |
| 291 | |
| 292 | afs_get_cell(cell); |
| 293 | vlocation->cell = cell; |
| 294 | |
| 295 | list_add_tail(&vlocation->link, &cell->vl_list); |
| 296 | |
| 297 | #ifdef AFS_CACHING_SUPPORT |
| 298 | /* we want to store it in the cache, plus it might already be |
| 299 | * encached */ |
| 300 | cachefs_acquire_cookie(cell->cache, |
| 301 | &afs_volume_cache_index_def, |
| 302 | vlocation, |
| 303 | &vlocation->cache); |
| 304 | |
| 305 | if (vlocation->valid) |
| 306 | goto found_in_cache; |
| 307 | #endif |
| 308 | |
| 309 | /* try to look up an unknown volume in the cell VL databases by name */ |
| 310 | ret = afs_vlocation_access_vl_by_name(vlocation, name, namesz, &vldb); |
| 311 | if (ret < 0) { |
| 312 | printk("kAFS: failed to locate '%*.*s' in cell '%s'\n", |
| 313 | namesz, namesz, name, cell->name); |
| 314 | goto error; |
| 315 | } |
| 316 | |
| 317 | goto found_on_vlserver; |
| 318 | |
David Howells | ec26815 | 2007-04-26 15:49:28 -0700 | [diff] [blame^] | 319 | found_in_graveyard: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 320 | /* found in the graveyard - resurrect */ |
| 321 | _debug("found in graveyard"); |
| 322 | atomic_inc(&vlocation->usage); |
Akinobu Mita | f116629 | 2006-06-26 00:24:46 -0700 | [diff] [blame] | 323 | list_move_tail(&vlocation->link, &cell->vl_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 324 | spin_unlock(&cell->vl_gylock); |
| 325 | |
| 326 | afs_kafstimod_del_timer(&vlocation->timeout); |
| 327 | goto active; |
| 328 | |
David Howells | ec26815 | 2007-04-26 15:49:28 -0700 | [diff] [blame^] | 329 | found_in_memory: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 330 | /* found in memory - check to see if it's active */ |
| 331 | _debug("found in memory"); |
| 332 | atomic_inc(&vlocation->usage); |
| 333 | |
David Howells | ec26815 | 2007-04-26 15:49:28 -0700 | [diff] [blame^] | 334 | active: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 335 | active = 1; |
| 336 | |
| 337 | #ifdef AFS_CACHING_SUPPORT |
David Howells | ec26815 | 2007-04-26 15:49:28 -0700 | [diff] [blame^] | 338 | found_in_cache: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 339 | #endif |
| 340 | /* try to look up a cached volume in the cell VL databases by ID */ |
| 341 | _debug("found in cache"); |
| 342 | |
| 343 | _debug("Locally Cached: %s %02x { %08x(%x) %08x(%x) %08x(%x) }", |
| 344 | vlocation->vldb.name, |
| 345 | vlocation->vldb.vidmask, |
| 346 | ntohl(vlocation->vldb.servers[0].s_addr), |
| 347 | vlocation->vldb.srvtmask[0], |
| 348 | ntohl(vlocation->vldb.servers[1].s_addr), |
| 349 | vlocation->vldb.srvtmask[1], |
| 350 | ntohl(vlocation->vldb.servers[2].s_addr), |
| 351 | vlocation->vldb.srvtmask[2] |
| 352 | ); |
| 353 | |
| 354 | _debug("Vids: %08x %08x %08x", |
| 355 | vlocation->vldb.vid[0], |
| 356 | vlocation->vldb.vid[1], |
| 357 | vlocation->vldb.vid[2]); |
| 358 | |
| 359 | if (vlocation->vldb.vidmask & AFS_VOL_VTM_RW) { |
| 360 | vid = vlocation->vldb.vid[0]; |
| 361 | voltype = AFSVL_RWVOL; |
David Howells | ec26815 | 2007-04-26 15:49:28 -0700 | [diff] [blame^] | 362 | } else if (vlocation->vldb.vidmask & AFS_VOL_VTM_RO) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 363 | vid = vlocation->vldb.vid[1]; |
| 364 | voltype = AFSVL_ROVOL; |
David Howells | ec26815 | 2007-04-26 15:49:28 -0700 | [diff] [blame^] | 365 | } else if (vlocation->vldb.vidmask & AFS_VOL_VTM_BAK) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 366 | vid = vlocation->vldb.vid[2]; |
| 367 | voltype = AFSVL_BACKVOL; |
David Howells | ec26815 | 2007-04-26 15:49:28 -0700 | [diff] [blame^] | 368 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 369 | BUG(); |
| 370 | vid = 0; |
| 371 | voltype = 0; |
| 372 | } |
| 373 | |
| 374 | ret = afs_vlocation_access_vl_by_id(vlocation, vid, voltype, &vldb); |
| 375 | switch (ret) { |
| 376 | /* net error */ |
| 377 | default: |
| 378 | printk("kAFS: failed to volume '%*.*s' (%x) up in '%s': %d\n", |
| 379 | namesz, namesz, name, vid, cell->name, ret); |
| 380 | goto error; |
| 381 | |
| 382 | /* pulled from local cache into memory */ |
| 383 | case 0: |
| 384 | goto found_on_vlserver; |
| 385 | |
| 386 | /* uh oh... looks like the volume got deleted */ |
| 387 | case -ENOMEDIUM: |
| 388 | printk("kAFS: volume '%*.*s' (%x) does not exist '%s'\n", |
| 389 | namesz, namesz, name, vid, cell->name); |
| 390 | |
| 391 | /* TODO: make existing record unavailable */ |
| 392 | goto error; |
| 393 | } |
| 394 | |
David Howells | ec26815 | 2007-04-26 15:49:28 -0700 | [diff] [blame^] | 395 | found_on_vlserver: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 396 | _debug("Done VL Lookup: %*.*s %02x { %08x(%x) %08x(%x) %08x(%x) }", |
| 397 | namesz, namesz, name, |
| 398 | vldb.vidmask, |
| 399 | ntohl(vldb.servers[0].s_addr), vldb.srvtmask[0], |
| 400 | ntohl(vldb.servers[1].s_addr), vldb.srvtmask[1], |
| 401 | ntohl(vldb.servers[2].s_addr), vldb.srvtmask[2] |
| 402 | ); |
| 403 | |
| 404 | _debug("Vids: %08x %08x %08x", vldb.vid[0], vldb.vid[1], vldb.vid[2]); |
| 405 | |
| 406 | if ((namesz < sizeof(vlocation->vldb.name) && |
| 407 | vlocation->vldb.name[namesz] != '\0') || |
| 408 | memcmp(vldb.name, name, namesz) != 0) |
| 409 | printk("kAFS: name of volume '%*.*s' changed to '%s' on server\n", |
| 410 | namesz, namesz, name, vldb.name); |
| 411 | |
| 412 | memcpy(&vlocation->vldb, &vldb, sizeof(vlocation->vldb)); |
| 413 | |
| 414 | afs_kafstimod_add_timer(&vlocation->upd_timer, 10 * HZ); |
| 415 | |
| 416 | #ifdef AFS_CACHING_SUPPORT |
| 417 | /* update volume entry in local cache */ |
| 418 | cachefs_update_cookie(vlocation->cache); |
| 419 | #endif |
| 420 | |
| 421 | *_vlocation = vlocation; |
| 422 | _leave(" = 0 (%p)",vlocation); |
| 423 | return 0; |
| 424 | |
David Howells | ec26815 | 2007-04-26 15:49:28 -0700 | [diff] [blame^] | 425 | error: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 426 | if (vlocation) { |
| 427 | if (active) { |
| 428 | __afs_put_vlocation(vlocation); |
David Howells | ec26815 | 2007-04-26 15:49:28 -0700 | [diff] [blame^] | 429 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 430 | list_del(&vlocation->link); |
| 431 | #ifdef AFS_CACHING_SUPPORT |
| 432 | cachefs_relinquish_cookie(vlocation->cache, 0); |
| 433 | #endif |
| 434 | afs_put_cell(vlocation->cell); |
| 435 | kfree(vlocation); |
| 436 | } |
| 437 | } |
| 438 | |
| 439 | _leave(" = %d", ret); |
| 440 | return ret; |
David Howells | ec26815 | 2007-04-26 15:49:28 -0700 | [diff] [blame^] | 441 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 442 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 443 | /* |
| 444 | * finish using a volume location record |
| 445 | * - caller must have cell->vol_sem write-locked |
| 446 | */ |
| 447 | static void __afs_put_vlocation(struct afs_vlocation *vlocation) |
| 448 | { |
| 449 | struct afs_cell *cell; |
| 450 | |
| 451 | if (!vlocation) |
| 452 | return; |
| 453 | |
| 454 | _enter("%s", vlocation->vldb.name); |
| 455 | |
| 456 | cell = vlocation->cell; |
| 457 | |
| 458 | /* sanity check */ |
| 459 | BUG_ON(atomic_read(&vlocation->usage) <= 0); |
| 460 | |
| 461 | spin_lock(&cell->vl_gylock); |
| 462 | if (likely(!atomic_dec_and_test(&vlocation->usage))) { |
| 463 | spin_unlock(&cell->vl_gylock); |
| 464 | _leave(""); |
| 465 | return; |
| 466 | } |
| 467 | |
| 468 | /* move to graveyard queue */ |
Akinobu Mita | f116629 | 2006-06-26 00:24:46 -0700 | [diff] [blame] | 469 | list_move_tail(&vlocation->link,&cell->vl_graveyard); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 470 | |
| 471 | /* remove from pending timeout queue (refcounted if actually being |
| 472 | * updated) */ |
| 473 | list_del_init(&vlocation->upd_op.link); |
| 474 | |
| 475 | /* time out in 10 secs */ |
| 476 | afs_kafstimod_del_timer(&vlocation->upd_timer); |
| 477 | afs_kafstimod_add_timer(&vlocation->timeout, 10 * HZ); |
| 478 | |
| 479 | spin_unlock(&cell->vl_gylock); |
| 480 | |
| 481 | _leave(" [killed]"); |
David Howells | ec26815 | 2007-04-26 15:49:28 -0700 | [diff] [blame^] | 482 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 483 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 484 | /* |
| 485 | * finish using a volume location record |
| 486 | */ |
| 487 | void afs_put_vlocation(struct afs_vlocation *vlocation) |
| 488 | { |
| 489 | if (vlocation) { |
| 490 | struct afs_cell *cell = vlocation->cell; |
| 491 | |
| 492 | down_write(&cell->vl_sem); |
| 493 | __afs_put_vlocation(vlocation); |
| 494 | up_write(&cell->vl_sem); |
| 495 | } |
David Howells | ec26815 | 2007-04-26 15:49:28 -0700 | [diff] [blame^] | 496 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 497 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 498 | /* |
| 499 | * timeout vlocation record |
| 500 | * - removes from the cell's graveyard if the usage count is zero |
| 501 | */ |
| 502 | void afs_vlocation_do_timeout(struct afs_vlocation *vlocation) |
| 503 | { |
| 504 | struct afs_cell *cell; |
| 505 | |
| 506 | _enter("%s", vlocation->vldb.name); |
| 507 | |
| 508 | cell = vlocation->cell; |
| 509 | |
| 510 | BUG_ON(atomic_read(&vlocation->usage) < 0); |
| 511 | |
| 512 | /* remove from graveyard if still dead */ |
| 513 | spin_lock(&cell->vl_gylock); |
| 514 | if (atomic_read(&vlocation->usage) == 0) |
| 515 | list_del_init(&vlocation->link); |
| 516 | else |
| 517 | vlocation = NULL; |
| 518 | spin_unlock(&cell->vl_gylock); |
| 519 | |
| 520 | if (!vlocation) { |
| 521 | _leave(""); |
| 522 | return; /* resurrected */ |
| 523 | } |
| 524 | |
| 525 | /* we can now destroy it properly */ |
| 526 | #ifdef AFS_CACHING_SUPPORT |
| 527 | cachefs_relinquish_cookie(vlocation->cache, 0); |
| 528 | #endif |
| 529 | afs_put_cell(cell); |
| 530 | |
| 531 | kfree(vlocation); |
| 532 | |
| 533 | _leave(" [destroyed]"); |
David Howells | ec26815 | 2007-04-26 15:49:28 -0700 | [diff] [blame^] | 534 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 535 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 536 | /* |
| 537 | * send an update operation to the currently selected server |
| 538 | */ |
| 539 | static int afs_vlocation_update_begin(struct afs_vlocation *vlocation) |
| 540 | { |
| 541 | afs_voltype_t voltype; |
| 542 | afs_volid_t vid; |
| 543 | int ret; |
| 544 | |
| 545 | _enter("%s{ufs=%u ucs=%u}", |
| 546 | vlocation->vldb.name, |
| 547 | vlocation->upd_first_svix, |
| 548 | vlocation->upd_curr_svix); |
| 549 | |
| 550 | /* try to look up a cached volume in the cell VL databases by ID */ |
| 551 | if (vlocation->vldb.vidmask & AFS_VOL_VTM_RW) { |
| 552 | vid = vlocation->vldb.vid[0]; |
| 553 | voltype = AFSVL_RWVOL; |
David Howells | ec26815 | 2007-04-26 15:49:28 -0700 | [diff] [blame^] | 554 | } else if (vlocation->vldb.vidmask & AFS_VOL_VTM_RO) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 555 | vid = vlocation->vldb.vid[1]; |
| 556 | voltype = AFSVL_ROVOL; |
David Howells | ec26815 | 2007-04-26 15:49:28 -0700 | [diff] [blame^] | 557 | } else if (vlocation->vldb.vidmask & AFS_VOL_VTM_BAK) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 558 | vid = vlocation->vldb.vid[2]; |
| 559 | voltype = AFSVL_BACKVOL; |
David Howells | ec26815 | 2007-04-26 15:49:28 -0700 | [diff] [blame^] | 560 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 561 | BUG(); |
| 562 | vid = 0; |
| 563 | voltype = 0; |
| 564 | } |
| 565 | |
| 566 | /* contact the chosen server */ |
| 567 | ret = afs_server_lookup( |
| 568 | vlocation->cell, |
| 569 | &vlocation->cell->vl_addrs[vlocation->upd_curr_svix], |
| 570 | &vlocation->upd_op.server); |
| 571 | |
| 572 | switch (ret) { |
| 573 | case 0: |
| 574 | break; |
| 575 | case -ENOMEM: |
| 576 | case -ENONET: |
| 577 | default: |
| 578 | _leave(" = %d", ret); |
| 579 | return ret; |
| 580 | } |
| 581 | |
| 582 | /* initiate the update operation */ |
| 583 | ret = afs_rxvl_get_entry_by_id_async(&vlocation->upd_op, vid, voltype); |
| 584 | if (ret < 0) { |
| 585 | _leave(" = %d", ret); |
| 586 | return ret; |
| 587 | } |
| 588 | |
| 589 | _leave(" = %d", ret); |
| 590 | return ret; |
David Howells | ec26815 | 2007-04-26 15:49:28 -0700 | [diff] [blame^] | 591 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 592 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 593 | /* |
| 594 | * abandon updating a VL record |
| 595 | * - does not restart the update timer |
| 596 | */ |
| 597 | static void afs_vlocation_update_abandon(struct afs_vlocation *vlocation, |
| 598 | afs_vlocation_upd_t state, |
| 599 | int ret) |
| 600 | { |
| 601 | _enter("%s,%u", vlocation->vldb.name, state); |
| 602 | |
| 603 | if (ret < 0) |
| 604 | printk("kAFS: Abandoning VL update '%s': %d\n", |
| 605 | vlocation->vldb.name, ret); |
| 606 | |
| 607 | /* discard the server record */ |
| 608 | afs_put_server(vlocation->upd_op.server); |
| 609 | vlocation->upd_op.server = NULL; |
| 610 | |
| 611 | spin_lock(&afs_vlocation_update_lock); |
| 612 | afs_vlocation_update = NULL; |
| 613 | vlocation->upd_state = state; |
| 614 | |
| 615 | /* TODO: start updating next VL record on pending list */ |
| 616 | |
| 617 | spin_unlock(&afs_vlocation_update_lock); |
| 618 | |
| 619 | _leave(""); |
David Howells | ec26815 | 2007-04-26 15:49:28 -0700 | [diff] [blame^] | 620 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 621 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 622 | /* |
| 623 | * handle periodic update timeouts and busy retry timeouts |
| 624 | * - called from kafstimod |
| 625 | */ |
| 626 | static void afs_vlocation_update_timer(struct afs_timer *timer) |
| 627 | { |
| 628 | struct afs_vlocation *vlocation = |
| 629 | list_entry(timer, struct afs_vlocation, upd_timer); |
| 630 | int ret; |
| 631 | |
| 632 | _enter("%s", vlocation->vldb.name); |
| 633 | |
| 634 | /* only update if not in the graveyard (defend against putting too) */ |
| 635 | spin_lock(&vlocation->cell->vl_gylock); |
| 636 | |
| 637 | if (!atomic_read(&vlocation->usage)) |
| 638 | goto out_unlock1; |
| 639 | |
| 640 | spin_lock(&afs_vlocation_update_lock); |
| 641 | |
| 642 | /* if we were woken up due to EBUSY sleep then restart immediately if |
| 643 | * possible or else jump to front of pending queue */ |
| 644 | if (vlocation->upd_state == AFS_VLUPD_BUSYSLEEP) { |
| 645 | if (afs_vlocation_update) { |
| 646 | list_add(&vlocation->upd_op.link, |
| 647 | &afs_vlocation_update_pendq); |
David Howells | ec26815 | 2007-04-26 15:49:28 -0700 | [diff] [blame^] | 648 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 649 | afs_get_vlocation(vlocation); |
| 650 | afs_vlocation_update = vlocation; |
| 651 | vlocation->upd_state = AFS_VLUPD_INPROGRESS; |
| 652 | } |
| 653 | goto out_unlock2; |
| 654 | } |
| 655 | |
| 656 | /* put on pending queue if there's already another update in progress */ |
| 657 | if (afs_vlocation_update) { |
| 658 | vlocation->upd_state = AFS_VLUPD_PENDING; |
| 659 | list_add_tail(&vlocation->upd_op.link, |
| 660 | &afs_vlocation_update_pendq); |
| 661 | goto out_unlock2; |
| 662 | } |
| 663 | |
| 664 | /* hold a ref on it while actually updating */ |
| 665 | afs_get_vlocation(vlocation); |
| 666 | afs_vlocation_update = vlocation; |
| 667 | vlocation->upd_state = AFS_VLUPD_INPROGRESS; |
| 668 | |
| 669 | spin_unlock(&afs_vlocation_update_lock); |
| 670 | spin_unlock(&vlocation->cell->vl_gylock); |
| 671 | |
| 672 | /* okay... we can start the update */ |
| 673 | _debug("BEGIN VL UPDATE [%s]", vlocation->vldb.name); |
| 674 | vlocation->upd_first_svix = vlocation->cell->vl_curr_svix; |
| 675 | vlocation->upd_curr_svix = vlocation->upd_first_svix; |
| 676 | vlocation->upd_rej_cnt = 0; |
| 677 | vlocation->upd_busy_cnt = 0; |
| 678 | |
| 679 | ret = afs_vlocation_update_begin(vlocation); |
| 680 | if (ret < 0) { |
| 681 | afs_vlocation_update_abandon(vlocation, AFS_VLUPD_SLEEP, ret); |
| 682 | afs_kafstimod_add_timer(&vlocation->upd_timer, |
| 683 | AFS_VLDB_TIMEOUT); |
| 684 | afs_put_vlocation(vlocation); |
| 685 | } |
| 686 | |
| 687 | _leave(""); |
| 688 | return; |
| 689 | |
David Howells | ec26815 | 2007-04-26 15:49:28 -0700 | [diff] [blame^] | 690 | out_unlock2: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 691 | spin_unlock(&afs_vlocation_update_lock); |
David Howells | ec26815 | 2007-04-26 15:49:28 -0700 | [diff] [blame^] | 692 | out_unlock1: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 693 | spin_unlock(&vlocation->cell->vl_gylock); |
| 694 | _leave(""); |
David Howells | ec26815 | 2007-04-26 15:49:28 -0700 | [diff] [blame^] | 695 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 696 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 697 | /* |
| 698 | * attend to an update operation upon which an event happened |
| 699 | * - called in kafsasyncd context |
| 700 | */ |
| 701 | static void afs_vlocation_update_attend(struct afs_async_op *op) |
| 702 | { |
| 703 | struct afs_cache_vlocation vldb; |
| 704 | struct afs_vlocation *vlocation = |
| 705 | list_entry(op, struct afs_vlocation, upd_op); |
| 706 | unsigned tmp; |
| 707 | int ret; |
| 708 | |
| 709 | _enter("%s", vlocation->vldb.name); |
| 710 | |
| 711 | ret = afs_rxvl_get_entry_by_id_async2(op, &vldb); |
| 712 | switch (ret) { |
| 713 | case -EAGAIN: |
| 714 | _leave(" [unfinished]"); |
| 715 | return; |
| 716 | |
| 717 | case 0: |
| 718 | _debug("END VL UPDATE: %d\n", ret); |
| 719 | vlocation->valid = 1; |
| 720 | |
| 721 | _debug("Done VL Lookup: %02x { %08x(%x) %08x(%x) %08x(%x) }", |
| 722 | vldb.vidmask, |
| 723 | ntohl(vldb.servers[0].s_addr), vldb.srvtmask[0], |
| 724 | ntohl(vldb.servers[1].s_addr), vldb.srvtmask[1], |
| 725 | ntohl(vldb.servers[2].s_addr), vldb.srvtmask[2] |
| 726 | ); |
| 727 | |
| 728 | _debug("Vids: %08x %08x %08x", |
| 729 | vldb.vid[0], vldb.vid[1], vldb.vid[2]); |
| 730 | |
| 731 | afs_vlocation_update_abandon(vlocation, AFS_VLUPD_SLEEP, 0); |
| 732 | |
| 733 | down_write(&vlocation->cell->vl_sem); |
| 734 | |
| 735 | /* actually update the cache */ |
| 736 | if (strncmp(vldb.name, vlocation->vldb.name, |
| 737 | sizeof(vlocation->vldb.name)) != 0) |
| 738 | printk("kAFS: name of volume '%s'" |
| 739 | " changed to '%s' on server\n", |
| 740 | vlocation->vldb.name, vldb.name); |
| 741 | |
| 742 | memcpy(&vlocation->vldb, &vldb, sizeof(vlocation->vldb)); |
| 743 | |
| 744 | #if 0 |
| 745 | /* TODO update volume entry in local cache */ |
| 746 | #endif |
| 747 | |
| 748 | up_write(&vlocation->cell->vl_sem); |
| 749 | |
| 750 | if (ret < 0) |
| 751 | printk("kAFS: failed to update local cache: %d\n", ret); |
| 752 | |
| 753 | afs_kafstimod_add_timer(&vlocation->upd_timer, |
| 754 | AFS_VLDB_TIMEOUT); |
| 755 | afs_put_vlocation(vlocation); |
| 756 | _leave(" [found]"); |
| 757 | return; |
| 758 | |
| 759 | case -ENOMEDIUM: |
| 760 | vlocation->upd_rej_cnt++; |
| 761 | goto try_next; |
| 762 | |
| 763 | /* the server is locked - retry in a very short while */ |
| 764 | case -EBUSY: |
| 765 | vlocation->upd_busy_cnt++; |
| 766 | if (vlocation->upd_busy_cnt > 3) |
| 767 | goto try_next; /* too many retries */ |
| 768 | |
| 769 | afs_vlocation_update_abandon(vlocation, |
| 770 | AFS_VLUPD_BUSYSLEEP, 0); |
| 771 | afs_kafstimod_add_timer(&vlocation->upd_timer, HZ / 2); |
| 772 | afs_put_vlocation(vlocation); |
| 773 | _leave(" [busy]"); |
| 774 | return; |
| 775 | |
| 776 | case -ENETUNREACH: |
| 777 | case -EHOSTUNREACH: |
| 778 | case -ECONNREFUSED: |
| 779 | case -EREMOTEIO: |
| 780 | /* record bad vlserver info in the cell too |
| 781 | * - TODO: use down_write_trylock() if available |
| 782 | */ |
| 783 | if (vlocation->upd_curr_svix == vlocation->cell->vl_curr_svix) |
| 784 | vlocation->cell->vl_curr_svix = |
| 785 | vlocation->cell->vl_curr_svix % |
| 786 | vlocation->cell->vl_naddrs; |
| 787 | |
| 788 | case -EBADRQC: |
| 789 | case -EINVAL: |
| 790 | case -EACCES: |
| 791 | case -EBADMSG: |
| 792 | goto try_next; |
| 793 | |
| 794 | default: |
| 795 | goto abandon; |
| 796 | } |
| 797 | |
| 798 | /* try contacting the next server */ |
David Howells | ec26815 | 2007-04-26 15:49:28 -0700 | [diff] [blame^] | 799 | try_next: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 800 | vlocation->upd_busy_cnt = 0; |
| 801 | |
| 802 | /* discard the server record */ |
| 803 | afs_put_server(vlocation->upd_op.server); |
| 804 | vlocation->upd_op.server = NULL; |
| 805 | |
| 806 | tmp = vlocation->cell->vl_naddrs; |
| 807 | if (tmp == 0) |
| 808 | goto abandon; |
| 809 | |
| 810 | vlocation->upd_curr_svix++; |
| 811 | if (vlocation->upd_curr_svix >= tmp) |
| 812 | vlocation->upd_curr_svix = 0; |
| 813 | if (vlocation->upd_first_svix >= tmp) |
| 814 | vlocation->upd_first_svix = tmp - 1; |
| 815 | |
| 816 | /* move to the next server */ |
| 817 | if (vlocation->upd_curr_svix != vlocation->upd_first_svix) { |
| 818 | afs_vlocation_update_begin(vlocation); |
| 819 | _leave(" [next]"); |
| 820 | return; |
| 821 | } |
| 822 | |
| 823 | /* run out of servers to try - was the volume rejected? */ |
| 824 | if (vlocation->upd_rej_cnt > 0) { |
| 825 | printk("kAFS: Active volume no longer valid '%s'\n", |
| 826 | vlocation->vldb.name); |
| 827 | vlocation->valid = 0; |
| 828 | afs_vlocation_update_abandon(vlocation, AFS_VLUPD_SLEEP, 0); |
| 829 | afs_kafstimod_add_timer(&vlocation->upd_timer, |
| 830 | AFS_VLDB_TIMEOUT); |
| 831 | afs_put_vlocation(vlocation); |
| 832 | _leave(" [invalidated]"); |
| 833 | return; |
| 834 | } |
| 835 | |
| 836 | /* abandon the update */ |
David Howells | ec26815 | 2007-04-26 15:49:28 -0700 | [diff] [blame^] | 837 | abandon: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 838 | afs_vlocation_update_abandon(vlocation, AFS_VLUPD_SLEEP, ret); |
| 839 | afs_kafstimod_add_timer(&vlocation->upd_timer, HZ * 10); |
| 840 | afs_put_vlocation(vlocation); |
| 841 | _leave(" [abandoned]"); |
David Howells | ec26815 | 2007-04-26 15:49:28 -0700 | [diff] [blame^] | 842 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 843 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 844 | /* |
| 845 | * deal with an update operation being discarded |
| 846 | * - called in kafsasyncd context when it's dying due to rmmod |
| 847 | * - the call has already been aborted and put()'d |
| 848 | */ |
| 849 | static void afs_vlocation_update_discard(struct afs_async_op *op) |
| 850 | { |
| 851 | struct afs_vlocation *vlocation = |
| 852 | list_entry(op, struct afs_vlocation, upd_op); |
| 853 | |
| 854 | _enter("%s", vlocation->vldb.name); |
| 855 | |
| 856 | afs_put_server(op->server); |
| 857 | op->server = NULL; |
| 858 | |
| 859 | afs_put_vlocation(vlocation); |
| 860 | |
| 861 | _leave(""); |
David Howells | ec26815 | 2007-04-26 15:49:28 -0700 | [diff] [blame^] | 862 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 863 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 864 | /* |
| 865 | * match a VLDB record stored in the cache |
| 866 | * - may also load target from entry |
| 867 | */ |
| 868 | #ifdef AFS_CACHING_SUPPORT |
| 869 | static cachefs_match_val_t afs_vlocation_cache_match(void *target, |
| 870 | const void *entry) |
| 871 | { |
| 872 | const struct afs_cache_vlocation *vldb = entry; |
| 873 | struct afs_vlocation *vlocation = target; |
| 874 | |
| 875 | _enter("{%s},{%s}", vlocation->vldb.name, vldb->name); |
| 876 | |
| 877 | if (strncmp(vlocation->vldb.name, vldb->name, sizeof(vldb->name)) == 0 |
| 878 | ) { |
| 879 | if (!vlocation->valid || |
| 880 | vlocation->vldb.rtime == vldb->rtime |
| 881 | ) { |
| 882 | vlocation->vldb = *vldb; |
| 883 | vlocation->valid = 1; |
| 884 | _leave(" = SUCCESS [c->m]"); |
| 885 | return CACHEFS_MATCH_SUCCESS; |
David Howells | ec26815 | 2007-04-26 15:49:28 -0700 | [diff] [blame^] | 886 | } else if (memcmp(&vlocation->vldb, vldb, sizeof(*vldb)) != 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 887 | /* delete if VIDs for this name differ */ |
| 888 | if (memcmp(&vlocation->vldb.vid, |
| 889 | &vldb->vid, |
| 890 | sizeof(vldb->vid)) != 0) { |
| 891 | _leave(" = DELETE"); |
| 892 | return CACHEFS_MATCH_SUCCESS_DELETE; |
| 893 | } |
| 894 | |
| 895 | _leave(" = UPDATE"); |
| 896 | return CACHEFS_MATCH_SUCCESS_UPDATE; |
David Howells | ec26815 | 2007-04-26 15:49:28 -0700 | [diff] [blame^] | 897 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 898 | _leave(" = SUCCESS"); |
| 899 | return CACHEFS_MATCH_SUCCESS; |
| 900 | } |
| 901 | } |
| 902 | |
| 903 | _leave(" = FAILED"); |
| 904 | return CACHEFS_MATCH_FAILED; |
David Howells | ec26815 | 2007-04-26 15:49:28 -0700 | [diff] [blame^] | 905 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 906 | #endif |
| 907 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 908 | /* |
| 909 | * update a VLDB record stored in the cache |
| 910 | */ |
| 911 | #ifdef AFS_CACHING_SUPPORT |
| 912 | static void afs_vlocation_cache_update(void *source, void *entry) |
| 913 | { |
| 914 | struct afs_cache_vlocation *vldb = entry; |
| 915 | struct afs_vlocation *vlocation = source; |
| 916 | |
| 917 | _enter(""); |
| 918 | |
| 919 | *vldb = vlocation->vldb; |
David Howells | ec26815 | 2007-04-26 15:49:28 -0700 | [diff] [blame^] | 920 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 921 | #endif |