Lines Matching full:cell
2 /* AFS cell and server record management
33 * Set the cell timer to fire after a given delay, assuming it's not already
48 * Look up and get an activation reference on a cell record. The caller must
55 struct afs_cell *cell = NULL; in afs_find_cell_locked() local
67 cell = net->ws_cell; in afs_find_cell_locked()
68 if (!cell) in afs_find_cell_locked()
75 cell = rb_entry(p, struct afs_cell, net_node); in afs_find_cell_locked()
77 n = strncasecmp(cell->name, name, in afs_find_cell_locked()
78 min_t(size_t, cell->name_len, namesz)); in afs_find_cell_locked()
80 n = cell->name_len - namesz; in afs_find_cell_locked()
92 return afs_use_cell(cell, reason); in afs_find_cell_locked()
96 * Look up and get an activation reference on a cell record.
102 struct afs_cell *cell; in afs_find_cell() local
105 cell = afs_find_cell_locked(net, name, namesz, reason); in afs_find_cell()
107 return cell; in afs_find_cell()
111 * Set up a cell record and fill in its name, VL server address list and
119 struct afs_cell *cell; in afs_alloc_cell() local
130 /* Prohibit cell names that contain unprintable chars, '/' and '@' or in afs_alloc_cell()
131 * that begin with a dot. This also precludes "@cell". in afs_alloc_cell()
143 cell = kzalloc(sizeof(struct afs_cell), GFP_KERNEL); in afs_alloc_cell()
144 if (!cell) { in afs_alloc_cell()
149 cell->name = kmalloc(namelen + 1, GFP_KERNEL); in afs_alloc_cell()
150 if (!cell->name) { in afs_alloc_cell()
151 kfree(cell); in afs_alloc_cell()
155 cell->net = net; in afs_alloc_cell()
156 cell->name_len = namelen; in afs_alloc_cell()
158 cell->name[i] = tolower(name[i]); in afs_alloc_cell()
159 cell->name[i] = 0; in afs_alloc_cell()
161 refcount_set(&cell->ref, 1); in afs_alloc_cell()
162 atomic_set(&cell->active, 0); in afs_alloc_cell()
163 INIT_WORK(&cell->manager, afs_manage_cell_work); in afs_alloc_cell()
164 spin_lock_init(&cell->vs_lock); in afs_alloc_cell()
165 cell->volumes = RB_ROOT; in afs_alloc_cell()
166 INIT_HLIST_HEAD(&cell->proc_volumes); in afs_alloc_cell()
167 seqlock_init(&cell->volume_lock); in afs_alloc_cell()
168 cell->fs_servers = RB_ROOT; in afs_alloc_cell()
169 seqlock_init(&cell->fs_lock); in afs_alloc_cell()
170 INIT_LIST_HEAD(&cell->fs_open_mmaps); in afs_alloc_cell()
171 init_rwsem(&cell->fs_open_mmaps_lock); in afs_alloc_cell()
172 rwlock_init(&cell->vl_servers_lock); in afs_alloc_cell()
173 cell->flags = (1 << AFS_CELL_FL_CHECK_ALIAS); in afs_alloc_cell()
189 cell->dns_expiry = TIME64_MAX; in afs_alloc_cell()
197 cell->dns_expiry = ktime_get_real_seconds(); in afs_alloc_cell()
200 rcu_assign_pointer(cell->vl_servers, vllist); in afs_alloc_cell()
202 cell->dns_source = vllist->source; in afs_alloc_cell()
203 cell->dns_status = vllist->status; in afs_alloc_cell()
204 smp_store_release(&cell->dns_lookup_count, 1); /* vs source/status */ in afs_alloc_cell()
206 cell->debug_id = atomic_inc_return(&cell_debug_id); in afs_alloc_cell()
207 trace_afs_cell(cell->debug_id, 1, 0, afs_cell_trace_alloc); in afs_alloc_cell()
209 _leave(" = %p", cell); in afs_alloc_cell()
210 return cell; in afs_alloc_cell()
216 kfree(cell->name); in afs_alloc_cell()
217 kfree(cell); in afs_alloc_cell()
223 * afs_lookup_cell - Look up or create a cell record.
225 * @name: The name of the cell.
226 * @namesz: The strlen of the cell name.
228 * @excl: T if an error should be given if the cell name already exists.
230 * Look up a cell record by name and query the DNS for VL server addresses if
233 * cell records to be shared even if not yet fully constructed.
239 struct afs_cell *cell, *candidate, *cursor; in afs_lookup_cell() local
247 cell = afs_find_cell(net, name, namesz, afs_cell_trace_use_lookup); in afs_lookup_cell()
248 if (!IS_ERR(cell)) in afs_lookup_cell()
252 /* Assume we're probably going to create a cell and preallocate and in afs_lookup_cell()
266 * cell whilst we were allocating. in afs_lookup_cell()
288 cell = candidate; in afs_lookup_cell()
290 atomic_set(&cell->active, 2); in afs_lookup_cell()
291 trace_afs_cell(cell->debug_id, refcount_read(&cell->ref), 2, afs_cell_trace_insert); in afs_lookup_cell()
292 rb_link_node_rcu(&cell->net_node, parent, pp); in afs_lookup_cell()
293 rb_insert_color(&cell->net_node, &net->cells); in afs_lookup_cell()
296 afs_queue_cell(cell, afs_cell_trace_get_queue_new); in afs_lookup_cell()
299 trace_afs_cell(cell->debug_id, refcount_read(&cell->ref), atomic_read(&cell->active), in afs_lookup_cell()
302 wait_var_event(&cell->state, in afs_lookup_cell()
304 state = smp_load_acquire(&cell->state); /* vs error */ in afs_lookup_cell()
310 ret = cell->error; in afs_lookup_cell()
314 _leave(" = %p [cell]", cell); in afs_lookup_cell()
315 return cell; in afs_lookup_cell()
318 _debug("cell exists"); in afs_lookup_cell()
319 cell = cursor; in afs_lookup_cell()
333 afs_unuse_cell(net, cell, afs_cell_trace_unuse_lookup); in afs_lookup_cell()
340 * set the root cell information
354 * - in the future we might initialize cell DB here. in afs_cell_init()
370 /* allocate a cell record for the root cell */ in afs_cell_init()
380 /* install the new cell */ in afs_cell_init()
393 * Update a cell's VL server address list from the DNS.
395 static int afs_update_cell(struct afs_cell *cell) in afs_update_cell() argument
403 _enter("%s", cell->name); in afs_update_cell()
405 vllist = afs_dns_query(cell, &expiry); in afs_update_cell()
409 _debug("%s: fail %d", cell->name, ret); in afs_update_cell()
435 _debug("%s: got list %d %d", cell->name, vllist->source, vllist->status); in afs_update_cell()
436 cell->dns_status = vllist->status; in afs_update_cell()
446 _debug("%s: status %d", cell->name, vllist->status); in afs_update_cell()
450 /* The DNS said that the cell does not exist or there in afs_update_cell()
453 cell->dns_expiry = expiry; in afs_update_cell()
461 cell->dns_expiry = now + 10; in afs_update_cell()
465 cell->dns_expiry = expiry; in afs_update_cell()
471 write_lock(&cell->vl_servers_lock); in afs_update_cell()
472 p = rcu_dereference_protected(cell->vl_servers, true); in afs_update_cell()
474 rcu_assign_pointer(cell->vl_servers, vllist); in afs_update_cell()
475 cell->dns_source = vllist->source; in afs_update_cell()
478 write_unlock(&cell->vl_servers_lock); in afs_update_cell()
479 afs_put_vlserverlist(cell->net, old); in afs_update_cell()
482 smp_store_release(&cell->dns_lookup_count, in afs_update_cell()
483 cell->dns_lookup_count + 1); /* vs source/status */ in afs_update_cell()
484 wake_up_var(&cell->dns_lookup_count); in afs_update_cell()
490 * Destroy a cell record
494 struct afs_cell *cell = container_of(rcu, struct afs_cell, rcu); in afs_cell_destroy() local
495 struct afs_net *net = cell->net; in afs_cell_destroy()
498 _enter("%p{%s}", cell, cell->name); in afs_cell_destroy()
500 r = refcount_read(&cell->ref); in afs_cell_destroy()
502 trace_afs_cell(cell->debug_id, r, atomic_read(&cell->active), afs_cell_trace_free); in afs_cell_destroy()
504 afs_put_vlserverlist(net, rcu_access_pointer(cell->vl_servers)); in afs_cell_destroy()
505 afs_unuse_cell(net, cell->alias_of, afs_cell_trace_unuse_alias); in afs_cell_destroy()
506 key_put(cell->anonymous_key); in afs_cell_destroy()
507 kfree(cell->name); in afs_cell_destroy()
508 kfree(cell); in afs_cell_destroy()
515 * Queue the cell manager.
528 * Cell management timer. We have an increment on cells_outstanding that we
541 * Get a reference on a cell record.
543 struct afs_cell *afs_get_cell(struct afs_cell *cell, enum afs_cell_trace reason) in afs_get_cell() argument
547 __refcount_inc(&cell->ref, &r); in afs_get_cell()
548 trace_afs_cell(cell->debug_id, r + 1, atomic_read(&cell->active), reason); in afs_get_cell()
549 return cell; in afs_get_cell()
553 * Drop a reference on a cell record.
555 void afs_put_cell(struct afs_cell *cell, enum afs_cell_trace reason) in afs_put_cell() argument
557 if (cell) { in afs_put_cell()
558 unsigned int debug_id = cell->debug_id; in afs_put_cell()
563 a = atomic_read(&cell->active); in afs_put_cell()
564 zero = __refcount_dec_and_test(&cell->ref, &r); in afs_put_cell()
567 a = atomic_read(&cell->active); in afs_put_cell()
568 WARN(a != 0, "Cell active count %u > 0\n", a); in afs_put_cell()
569 call_rcu(&cell->rcu, afs_cell_destroy); in afs_put_cell()
575 * Note a cell becoming more active.
577 struct afs_cell *afs_use_cell(struct afs_cell *cell, enum afs_cell_trace reason) in afs_use_cell() argument
581 r = refcount_read(&cell->ref); in afs_use_cell()
583 a = atomic_inc_return(&cell->active); in afs_use_cell()
584 trace_afs_cell(cell->debug_id, r, a, reason); in afs_use_cell()
585 return cell; in afs_use_cell()
589 * Record a cell becoming less active. When the active counter reaches 1, it
592 void afs_unuse_cell(struct afs_net *net, struct afs_cell *cell, enum afs_cell_trace reason) in afs_unuse_cell() argument
598 if (!cell) in afs_unuse_cell()
601 _enter("%s", cell->name); in afs_unuse_cell()
604 cell->last_inactive = now; in afs_unuse_cell()
606 if (cell->vl_servers->nr_servers) in afs_unuse_cell()
609 debug_id = cell->debug_id; in afs_unuse_cell()
610 r = refcount_read(&cell->ref); in afs_unuse_cell()
611 a = atomic_dec_return(&cell->active); in afs_unuse_cell()
615 /* 'cell' may now be garbage collected. */ in afs_unuse_cell()
620 * Note that a cell has been seen.
622 void afs_see_cell(struct afs_cell *cell, enum afs_cell_trace reason) in afs_see_cell() argument
626 r = refcount_read(&cell->ref); in afs_see_cell()
627 a = atomic_read(&cell->active); in afs_see_cell()
628 trace_afs_cell(cell->debug_id, r, a, reason); in afs_see_cell()
632 * Queue a cell for management, giving the workqueue a ref to hold.
634 void afs_queue_cell(struct afs_cell *cell, enum afs_cell_trace reason) in afs_queue_cell() argument
636 afs_get_cell(cell, reason); in afs_queue_cell()
637 if (!queue_work(afs_wq, &cell->manager)) in afs_queue_cell()
638 afs_put_cell(cell, afs_cell_trace_put_queue_fail); in afs_queue_cell()
644 static int afs_alloc_anon_key(struct afs_cell *cell) in afs_alloc_anon_key() argument
652 cp = cell->name; in afs_alloc_anon_key()
661 cell->anonymous_key = key; in afs_alloc_anon_key()
664 cell->anonymous_key, key_serial(cell->anonymous_key)); in afs_alloc_anon_key()
669 * Activate a cell.
671 static int afs_activate_cell(struct afs_net *net, struct afs_cell *cell) in afs_activate_cell() argument
677 if (!cell->anonymous_key) { in afs_activate_cell()
678 ret = afs_alloc_anon_key(cell); in afs_activate_cell()
683 ret = afs_proc_cell_setup(cell); in afs_activate_cell()
690 if (strcmp(cell->name, pcell->name) < 0) in afs_activate_cell()
694 cell->proc_link.pprev = p; in afs_activate_cell()
695 cell->proc_link.next = *p; in afs_activate_cell()
696 rcu_assign_pointer(*p, &cell->proc_link.next); in afs_activate_cell()
697 if (cell->proc_link.next) in afs_activate_cell()
698 cell->proc_link.next->pprev = &cell->proc_link.next; in afs_activate_cell()
700 afs_dynroot_mkdir(net, cell); in afs_activate_cell()
706 * Deactivate a cell.
708 static void afs_deactivate_cell(struct afs_net *net, struct afs_cell *cell) in afs_deactivate_cell() argument
710 _enter("%s", cell->name); in afs_deactivate_cell()
712 afs_proc_cell_remove(cell); in afs_deactivate_cell()
715 hlist_del_rcu(&cell->proc_link); in afs_deactivate_cell()
716 afs_dynroot_rmdir(net, cell); in afs_deactivate_cell()
723 * Manage a cell record, initialising and destroying it, maintaining its DNS
726 static void afs_manage_cell(struct afs_cell *cell) in afs_manage_cell() argument
728 struct afs_net *net = cell->net; in afs_manage_cell()
731 _enter("%s", cell->name); in afs_manage_cell()
734 _debug("state %u", cell->state); in afs_manage_cell()
735 switch (cell->state) { in afs_manage_cell()
740 if (atomic_try_cmpxchg_relaxed(&cell->active, &active, 0)) { in afs_manage_cell()
741 rb_erase(&cell->net_node, &net->cells); in afs_manage_cell()
742 trace_afs_cell(cell->debug_id, refcount_read(&cell->ref), 0, in afs_manage_cell()
744 smp_store_release(&cell->state, AFS_CELL_REMOVED); in afs_manage_cell()
747 if (cell->state == AFS_CELL_REMOVED) { in afs_manage_cell()
748 wake_up_var(&cell->state); in afs_manage_cell()
751 if (cell->state == AFS_CELL_FAILED) in afs_manage_cell()
753 smp_store_release(&cell->state, AFS_CELL_UNSET); in afs_manage_cell()
754 wake_up_var(&cell->state); in afs_manage_cell()
758 smp_store_release(&cell->state, AFS_CELL_ACTIVATING); in afs_manage_cell()
759 wake_up_var(&cell->state); in afs_manage_cell()
763 ret = afs_activate_cell(net, cell); in afs_manage_cell()
767 smp_store_release(&cell->state, AFS_CELL_ACTIVE); in afs_manage_cell()
768 wake_up_var(&cell->state); in afs_manage_cell()
772 if (atomic_read(&cell->active) > 1) { in afs_manage_cell()
773 if (test_and_clear_bit(AFS_CELL_FL_DO_LOOKUP, &cell->flags)) { in afs_manage_cell()
774 ret = afs_update_cell(cell); in afs_manage_cell()
776 cell->error = ret; in afs_manage_cell()
780 smp_store_release(&cell->state, AFS_CELL_DEACTIVATING); in afs_manage_cell()
781 wake_up_var(&cell->state); in afs_manage_cell()
785 if (atomic_read(&cell->active) > 1) in afs_manage_cell()
787 afs_deactivate_cell(net, cell); in afs_manage_cell()
788 smp_store_release(&cell->state, AFS_CELL_INACTIVE); in afs_manage_cell()
789 wake_up_var(&cell->state); in afs_manage_cell()
798 _debug("bad state %u", cell->state); in afs_manage_cell()
802 cell->error = ret; in afs_manage_cell()
803 afs_deactivate_cell(net, cell); in afs_manage_cell()
805 smp_store_release(&cell->state, AFS_CELL_FAILED); /* vs error */ in afs_manage_cell()
806 wake_up_var(&cell->state); in afs_manage_cell()
810 smp_store_release(&cell->state, AFS_CELL_ACTIVE); in afs_manage_cell()
811 wake_up_var(&cell->state); in afs_manage_cell()
816 _leave(" [done %u]", cell->state); in afs_manage_cell()
820 /* The root volume is pinning the cell */ in afs_manage_cell()
821 afs_put_volume(cell->net, cell->root_volume, afs_volume_trace_put_cell_root); in afs_manage_cell()
822 cell->root_volume = NULL; in afs_manage_cell()
823 afs_put_cell(cell, afs_cell_trace_put_destroy); in afs_manage_cell()
828 struct afs_cell *cell = container_of(work, struct afs_cell, manager); in afs_manage_cell_work() local
830 afs_manage_cell(cell); in afs_manage_cell_work()
831 afs_put_cell(cell, afs_cell_trace_put_queue_work); in afs_manage_cell_work()
839 * Note that constructed cell records may only be removed from net->cells by
856 /* Trawl the cell database looking for cells that have expired from in afs_manage_cells()
863 struct afs_cell *cell = in afs_manage_cells() local
868 active = atomic_read(&cell->active); in afs_manage_cells()
869 trace_afs_cell(cell->debug_id, refcount_read(&cell->ref), in afs_manage_cells()
875 if (test_and_clear_bit(AFS_CELL_FL_NO_GC, &cell->flags)) { in afs_manage_cells()
876 active = atomic_dec_return(&cell->active); in afs_manage_cells()
877 trace_afs_cell(cell->debug_id, refcount_read(&cell->ref), in afs_manage_cells()
884 time64_t expire_at = cell->last_inactive; in afs_manage_cells()
886 read_lock(&cell->vl_servers_lock); in afs_manage_cells()
888 cell->vl_servers, in afs_manage_cells()
889 lockdep_is_held(&cell->vl_servers_lock)); in afs_manage_cells()
892 read_unlock(&cell->vl_servers_lock); in afs_manage_cells()
900 if (test_bit(AFS_CELL_FL_DO_LOOKUP, &cell->flags)) in afs_manage_cells()
905 afs_queue_cell(cell, afs_cell_trace_get_queue_manage); in afs_manage_cells()
930 * Purge in-memory cell database.