Lines Matching defs:server
2 /* AFS server record management
22 * Find a server by one of its addresses.
28 struct afs_server *server = NULL;
35 if (server)
36 afs_unuse_server_notime(net, server, afs_server_trace_put_find_rsq);
37 server = NULL;
43 hlist_for_each_entry_rcu(server, &net->fs_addresses6, addr6_link) {
44 alist = rcu_dereference(server->addresses);
59 hlist_for_each_entry_rcu(server, &net->fs_addresses4, addr4_link) {
60 alist = rcu_dereference(server->addresses);
74 server = NULL;
77 server = afs_maybe_use_server(server, afs_server_trace_get_by_addr);
84 return server;
88 * Look up a server by its UUID and mark it active.
92 struct afs_server *server = NULL;
103 if (server)
104 afs_unuse_server(net, server, afs_server_trace_put_uuid_rsq);
105 server = NULL;
111 server = rb_entry(p, struct afs_server, uuid_rb);
113 diff = memcmp(uuid, &server->uuid, sizeof(*uuid));
119 afs_use_server(server, afs_server_trace_get_by_uuid);
123 server = NULL;
129 _leave(" = %p", server);
130 return server;
134 * Install a server record in the namespace tree. If there's a clash, we stick
142 struct afs_server *server, *next;
151 /* Firstly install the server in the UUID lookup tree */
157 server = rb_entry(p, struct afs_server, uuid_rb);
158 diff = memcmp(&candidate->uuid, &server->uuid, sizeof(uuid_t));
164 if (server->cell == cell)
168 * different cells. Append the new server to the list.
172 server->uuid_next,
176 server = next;
178 rcu_assign_pointer(server->uuid_next, candidate);
179 candidate->uuid_prev = server;
180 server = candidate;
185 server = candidate;
186 rb_link_node(&server->uuid_rb, p, pp);
187 rb_insert_color(&server->uuid_rb, &net->fs_servers);
188 hlist_add_head_rcu(&server->proc_link, &net->fs_proc);
192 alist = rcu_dereference_protected(server->addresses,
195 /* Secondly, if the server has any IPv4 and/or IPv6 addresses, install
204 hlist_add_head_rcu(&server->addr4_link, &net->fs_addresses4);
206 hlist_add_head_rcu(&server->addr6_link, &net->fs_addresses6);
211 afs_get_server(server, afs_server_trace_get_install);
213 return server;
217 * Allocate a new server record and mark it active.
223 struct afs_server *server;
228 server = kzalloc(sizeof(struct afs_server), GFP_KERNEL);
229 if (!server)
232 atomic_set(&server->ref, 1);
233 atomic_set(&server->active, 1);
234 server->debug_id = atomic_inc_return(&afs_server_debug_id);
235 RCU_INIT_POINTER(server->addresses, alist);
236 server->addr_version = alist->version;
237 server->uuid = *uuid;
238 rwlock_init(&server->fs_lock);
239 init_waitqueue_head(&server->probe_wq);
240 INIT_LIST_HEAD(&server->probe_link);
241 spin_lock_init(&server->probe_lock);
242 server->cell = cell;
243 server->rtt = UINT_MAX;
246 trace_afs_server(server, 1, 1, afs_server_trace_alloc);
247 _leave(" = %p", server);
248 return server;
256 * Look up an address record for a server
268 if (test_bit(AFS_VLSERVER_FL_IS_YFS, &vc.server->flags))
287 struct afs_server *server, *candidate;
291 server = afs_find_server_by_uuid(cell->net, uuid);
292 if (server) {
293 if (server->addr_version != addr_version)
294 set_bit(AFS_SERVER_FL_NEEDS_UPDATE, &server->flags);
295 return server;
308 server = afs_install_server(cell, candidate);
309 if (server != candidate) {
317 afs_fs_probe_fileserver(cell->net, server, key, true);
320 return server;
324 * Set the server timer to fire after a given delay, assuming it's not already
350 * Get a reference on a server object.
352 struct afs_server *afs_get_server(struct afs_server *server,
355 unsigned int u = atomic_inc_return(&server->ref);
357 trace_afs_server(server, u, atomic_read(&server->active), reason);
358 return server;
362 * Try to get a reference on a server object.
364 static struct afs_server *afs_maybe_use_server(struct afs_server *server,
367 unsigned int r = atomic_fetch_add_unless(&server->ref, 1, 0);
373 a = atomic_inc_return(&server->active);
374 trace_afs_server(server, r, a, reason);
375 return server;
379 * Get an active count on a server object.
381 struct afs_server *afs_use_server(struct afs_server *server, enum afs_server_trace reason)
383 unsigned int r = atomic_inc_return(&server->ref);
384 unsigned int a = atomic_inc_return(&server->active);
386 trace_afs_server(server, r, a, reason);
387 return server;
391 * Release a reference on a server record.
393 void afs_put_server(struct afs_net *net, struct afs_server *server,
398 if (!server)
401 usage = atomic_dec_return(&server->ref);
402 trace_afs_server(server, usage, atomic_read(&server->active), reason);
404 __afs_put_server(net, server);
408 * Drop an active count on a server object without updating the last-unused
411 void afs_unuse_server_notime(struct afs_net *net, struct afs_server *server,
414 if (server) {
415 unsigned int active = atomic_dec_return(&server->active);
419 afs_put_server(net, server, reason);
424 * Drop an active count on a server object.
426 void afs_unuse_server(struct afs_net *net, struct afs_server *server,
429 if (server) {
430 server->unuse_time = ktime_get_real_seconds();
431 afs_unuse_server_notime(net, server, reason);
437 struct afs_server *server = container_of(rcu, struct afs_server, rcu);
439 trace_afs_server(server, atomic_read(&server->ref),
440 atomic_read(&server->active), afs_server_trace_free);
441 afs_put_addrlist(rcu_access_pointer(server->addresses));
442 kfree(server);
445 static void __afs_put_server(struct afs_net *net, struct afs_server *server)
447 call_rcu(&server->rcu, afs_server_rcu);
451 static void afs_give_up_callbacks(struct afs_net *net, struct afs_server *server)
453 struct afs_addr_list *alist = rcu_access_pointer(server->addresses);
460 afs_fs_give_up_all_callbacks(net, server, &ac, NULL);
464 * destroy a dead server
466 static void afs_destroy_server(struct afs_net *net, struct afs_server *server)
468 if (test_bit(AFS_SERVER_FL_MAY_HAVE_CB, &server->flags))
469 afs_give_up_callbacks(net, server);
471 afs_put_server(net, server, afs_server_trace_destroy);
479 struct afs_server *server, *next, *prev;
482 while ((server = gc_list)) {
483 gc_list = server->gc_next;
487 active = atomic_read(&server->active);
489 trace_afs_server(server, atomic_read(&server->ref),
492 server->uuid_next, lockdep_is_held(&net->fs_lock.lock));
493 prev = server->uuid_prev;
497 rb_erase(&server->uuid_rb, &net->fs_servers);
499 rb_replace_node_rcu(&server->uuid_rb,
505 /* This server is not at the front */
511 list_del(&server->probe_link);
512 hlist_del_rcu(&server->proc_link);
513 if (!hlist_unhashed(&server->addr4_link))
514 hlist_del_rcu(&server->addr4_link);
515 if (!hlist_unhashed(&server->addr6_link))
516 hlist_del_rcu(&server->addr6_link);
521 afs_destroy_server(net, server);
542 /* Trawl the server list looking for servers that have expired from
548 struct afs_server *server =
550 int active = atomic_read(&server->active);
552 _debug("manage %pU %u", &server->uuid, active);
555 trace_afs_server(server, atomic_read(&server->ref),
558 pr_notice("Can't purge s=%08x\n", server->debug_id);
562 time64_t expire_at = server->unuse_time;
564 if (!test_bit(AFS_SERVER_FL_VL_FAIL, &server->flags) &&
565 !test_bit(AFS_SERVER_FL_NOT_FOUND, &server->flags))
568 server->gc_next = gc_list;
569 gc_list = server;
626 * Get an update for a server's address list.
629 struct afs_server *server)
635 trace_afs_server(server, atomic_read(&server->ref), atomic_read(&server->active),
638 alist = afs_vl_lookup_addrs(op->volume->cell, op->key, &server->uuid);
643 server->addresses) {
653 if (server->addr_version != alist->version) {
654 write_lock(&server->fs_lock);
655 discard = rcu_dereference_protected(server->addresses,
656 lockdep_is_held(&server->fs_lock));
657 rcu_assign_pointer(server->addresses, alist);
658 server->addr_version = alist->version;
659 write_unlock(&server->fs_lock);
668 * See if a server's address list needs updating.
670 bool afs_check_server_record(struct afs_operation *op, struct afs_server *server)
677 ASSERT(server);
680 if (test_bit(AFS_SERVER_FL_UPDATING, &server->flags))
682 if (test_bit(AFS_SERVER_FL_NEEDS_UPDATE, &server->flags))
688 if (!test_and_set_bit_lock(AFS_SERVER_FL_UPDATING, &server->flags)) {
689 clear_bit(AFS_SERVER_FL_NEEDS_UPDATE, &server->flags);
690 success = afs_update_server_record(op, server);
691 clear_bit_unlock(AFS_SERVER_FL_UPDATING, &server->flags);
692 wake_up_bit(&server->flags, AFS_SERVER_FL_UPDATING);
698 ret = wait_on_bit(&server->flags, AFS_SERVER_FL_UPDATING,