1 files changed, 189 insertions, 257 deletions
diff --git a/fs/afs/cell.c b/fs/afs/cell.c
index cee42646736c..0168bbf53fe0 100644
--- a/fs/afs/cell.c
+++ b/fs/afs/cell.c
@@ -20,8 +20,9 @@ static unsigned __read_mostly afs_cell_min_ttl = 10 * 60;
 static unsigned __read_mostly afs_cell_max_ttl = 24 * 60 * 60;
 static atomic_t cell_debug_id;
 
-static void afs_queue_cell_manager(struct afs_net *);
-static void afs_manage_cell_work(struct work_struct *);
+static void afs_cell_timer(struct timer_list *timer);
+static void afs_destroy_cell_work(struct work_struct *work);
+static void afs_manage_cell_work(struct work_struct *work);
 
 static void afs_dec_cells_outstanding(struct afs_net *net)
 {
@@ -29,19 +30,11 @@ static void afs_dec_cells_outstanding(struct afs_net *net)
 		wake_up_var(&net->cells_outstanding);
 }
 
-/*
- * Set the cell timer to fire after a given delay, assuming it's not already
- * set for an earlier time.
- */
-static void afs_set_cell_timer(struct afs_net *net, time64_t delay)
+static void afs_set_cell_state(struct afs_cell *cell, enum afs_cell_state state)
 {
-	if (net->live) {
-		atomic_inc(&net->cells_outstanding);
-		if (timer_reduce(&net->cells_timer, jiffies + delay * HZ))
-			afs_dec_cells_outstanding(net);
-	} else {
-		afs_queue_cell_manager(net);
-	}
+	smp_store_release(&cell->state, state); /* Commit cell changes before state */
+	smp_wmb(); /* Set cell state before task state */
+	wake_up_var(&cell->state);
 }
 
 /*
@@ -64,7 +57,8 @@ static struct afs_cell *afs_find_cell_locked(struct afs_net *net,
 		return ERR_PTR(-ENAMETOOLONG);
 
 	if (!name) {
-		cell = net->ws_cell;
+		cell = rcu_dereference_protected(net->ws_cell,
+						 lockdep_is_held(&net->cells_lock));
 		if (!cell)
 			return ERR_PTR(-EDESTADDRREQ);
 		goto found;
@@ -115,7 +109,7 @@ static struct afs_cell *afs_alloc_cell(struct afs_net *net,
 				       const char *name, unsigned int namelen,
 				       const char *addresses)
 {
-	struct afs_vlserver_list *vllist;
+	struct afs_vlserver_list *vllist = NULL;
 	struct afs_cell *cell;
 	int i, ret;
 
@@ -162,13 +156,15 @@ static struct afs_cell *afs_alloc_cell(struct afs_net *net,
 	cell->net = net;
 	refcount_set(&cell->ref, 1);
 	atomic_set(&cell->active, 0);
+	INIT_WORK(&cell->destroyer, afs_destroy_cell_work);
 	INIT_WORK(&cell->manager, afs_manage_cell_work);
+	timer_setup(&cell->management_timer, afs_cell_timer, 0);
 	init_rwsem(&cell->vs_lock);
 	cell->volumes = RB_ROOT;
 	INIT_HLIST_HEAD(&cell->proc_volumes);
 	seqlock_init(&cell->volume_lock);
 	cell->fs_servers = RB_ROOT;
-	seqlock_init(&cell->fs_lock);
+	init_rwsem(&cell->fs_lock);
 	rwlock_init(&cell->vl_servers_lock);
 	cell->flags = (1 << AFS_CELL_FL_CHECK_ALIAS);
 
@@ -203,7 +199,13 @@ static struct afs_cell *afs_alloc_cell(struct afs_net *net,
 	cell->dns_status = vllist->status;
 	smp_store_release(&cell->dns_lookup_count, 1); /* vs source/status */
 	atomic_inc(&net->cells_outstanding);
+	ret = idr_alloc_cyclic(&net->cells_dyn_ino, cell,
+			       2, INT_MAX / 2, GFP_KERNEL);
+	if (ret < 0)
+		goto error;
+	cell->dynroot_ino = ret;
 	cell->debug_id = atomic_inc_return(&cell_debug_id);
+
 	trace_afs_cell(cell->debug_id, 1, 0, afs_cell_trace_alloc);
 
 	_leave(" = %p", cell);
@@ -213,6 +215,7 @@ parse_failed:
 	if (ret == -EINVAL)
 		printk(KERN_ERR "kAFS: bad VL server IP address\n");
 error:
+	afs_put_vlserverlist(cell->net, vllist);
 	kfree(cell->name - 1);
 	kfree(cell);
 	_leave(" = %d", ret);
@@ -226,6 +229,7 @@ error:
  * @namesz:	The strlen of the cell name.
  * @vllist:	A colon/comma separated list of numeric IP addresses or NULL.
  * @excl:	T if an error should be given if the cell name already exists.
+ * @trace:	The reason to be logged if the lookup is successful.
  *
  * Look up a cell record by name and query the DNS for VL server addresses if
  * needed.  Note that that actual DNS query is punted off to the manager thread
@@ -234,7 +238,8 @@ error:
  */
 struct afs_cell *afs_lookup_cell(struct afs_net *net,
 				 const char *name, unsigned int namesz,
-				 const char *vllist, bool excl)
+				 const char *vllist, bool excl,
+				 enum afs_cell_trace trace)
 {
 	struct afs_cell *cell, *candidate, *cursor;
 	struct rb_node *parent, **pp;
@@ -244,7 +249,7 @@ struct afs_cell *afs_lookup_cell(struct afs_net *net,
 	_enter("%s,%s", name, vllist);
 
 	if (!excl) {
-		cell = afs_find_cell(net, name, namesz, afs_cell_trace_use_lookup);
+		cell = afs_find_cell(net, name, namesz, trace);
 		if (!IS_ERR(cell))
 			goto wait_for_cell;
 	}
@@ -287,26 +292,28 @@ struct afs_cell *afs_lookup_cell(struct afs_net *net,
 
 	cell = candidate;
 	candidate = NULL;
-	atomic_set(&cell->active, 2);
-	trace_afs_cell(cell->debug_id, refcount_read(&cell->ref), 2, afs_cell_trace_insert);
+	afs_use_cell(cell, trace);
 	rb_link_node_rcu(&cell->net_node, parent, pp);
 	rb_insert_color(&cell->net_node, &net->cells);
 	up_write(&net->cells_lock);
 
-	afs_queue_cell(cell, afs_cell_trace_get_queue_new);
+	afs_queue_cell(cell, afs_cell_trace_queue_new);
 
 wait_for_cell:
-	trace_afs_cell(cell->debug_id, refcount_read(&cell->ref), atomic_read(&cell->active),
-		       afs_cell_trace_wait);
 	_debug("wait_for_cell");
-	wait_var_event(&cell->state,
-		       ({
-			       state = smp_load_acquire(&cell->state); /* vs error */
-			       state == AFS_CELL_ACTIVE || state == AFS_CELL_REMOVED;
-		       }));
+	state = smp_load_acquire(&cell->state); /* vs error */
+	if (state != AFS_CELL_ACTIVE &&
+	    state != AFS_CELL_DEAD) {
+		afs_see_cell(cell, afs_cell_trace_wait);
+		wait_var_event(&cell->state,
+			       ({
+				       state = smp_load_acquire(&cell->state); /* vs error */
+				       state == AFS_CELL_ACTIVE || state == AFS_CELL_DEAD;
+			       }));
+	}
 
 	/* Check the state obtained from the wait check. */
-	if (state == AFS_CELL_REMOVED) {
+	if (state == AFS_CELL_DEAD) {
 		ret = cell->error;
 		goto error;
 	}
@@ -320,7 +327,7 @@ cell_already_exists:
 	if (excl) {
 		ret = -EEXIST;
 	} else {
-		afs_use_cell(cursor, afs_cell_trace_use_lookup);
+		afs_use_cell(cursor, trace);
 		ret = 0;
 	}
 	up_write(&net->cells_lock);
@@ -330,7 +337,7 @@ cell_already_exists:
 		goto wait_for_cell;
 	goto error_noput;
 error:
-	afs_unuse_cell(net, cell, afs_cell_trace_unuse_lookup);
+	afs_unuse_cell(cell, afs_cell_trace_unuse_lookup_error);
 error_noput:
 	_leave(" = %d [error]", ret);
 	return ERR_PTR(ret);
@@ -375,8 +382,9 @@ int afs_cell_init(struct afs_net *net, const char *rootcell)
 	if (cp && cp < rootcell + len)
 		return -EINVAL;
 
-	/* allocate a cell record for the root cell */
-	new_root = afs_lookup_cell(net, rootcell, len, vllist, false);
+	/* allocate a cell record for the root/workstation cell */
+	new_root = afs_lookup_cell(net, rootcell, len, vllist, false,
+				   afs_cell_trace_use_lookup_ws);
 	if (IS_ERR(new_root)) {
 		_leave(" = %ld", PTR_ERR(new_root));
 		return PTR_ERR(new_root);
@@ -387,12 +395,11 @@ int afs_cell_init(struct afs_net *net, const char *rootcell)
 
 	/* install the new cell */
 	down_write(&net->cells_lock);
-	afs_see_cell(new_root, afs_cell_trace_see_ws);
-	old_root = net->ws_cell;
-	net->ws_cell = new_root;
+	old_root = rcu_replace_pointer(net->ws_cell, new_root,
+				       lockdep_is_held(&net->cells_lock));
 	up_write(&net->cells_lock);
 
-	afs_unuse_cell(net, old_root, afs_cell_trace_unuse_ws);
+	afs_unuse_cell(old_root, afs_cell_trace_unuse_ws);
 	_leave(" = 0");
 	return 0;
 }
@@ -510,8 +517,9 @@ static void afs_cell_destroy(struct rcu_head *rcu)
 	trace_afs_cell(cell->debug_id, r, atomic_read(&cell->active), afs_cell_trace_free);
 
 	afs_put_vlserverlist(net, rcu_access_pointer(cell->vl_servers));
-	afs_unuse_cell(net, cell->alias_of, afs_cell_trace_unuse_alias);
+	afs_unuse_cell(cell->alias_of, afs_cell_trace_unuse_alias);
 	key_put(cell->anonymous_key);
+	idr_remove(&net->cells_dyn_ino, cell->dynroot_ino);
 	kfree(cell->name - 1);
 	kfree(cell);
 
@@ -519,30 +527,14 @@ static void afs_cell_destroy(struct rcu_head *rcu)
 	_leave(" [destroyed]");
 }
 
-/*
- * Queue the cell manager.
- */
-static void afs_queue_cell_manager(struct afs_net *net)
-{
-	int outstanding = atomic_inc_return(&net->cells_outstanding);
-
-	_enter("%d", outstanding);
-
-	if (!queue_work(afs_wq, &net->cells_manager))
-		afs_dec_cells_outstanding(net);
-}
-
-/*
- * Cell management timer.  We have an increment on cells_outstanding that we
- * need to pass along to the work item.
- */
-void afs_cells_timer(struct timer_list *timer)
+static void afs_destroy_cell_work(struct work_struct *work)
 {
-	struct afs_net *net = container_of(timer, struct afs_net, cells_timer);
+	struct afs_cell *cell = container_of(work, struct afs_cell, destroyer);
 
-	_enter("");
-	if (!queue_work(afs_wq, &net->cells_manager))
-		afs_dec_cells_outstanding(net);
+	afs_see_cell(cell, afs_cell_trace_destroy);
+	timer_delete_sync(&cell->management_timer);
+	cancel_work_sync(&cell->manager);
+	call_rcu(&cell->rcu, afs_cell_destroy);
 }
 
 /*
@@ -574,7 +566,7 @@ void afs_put_cell(struct afs_cell *cell, enum afs_cell_trace reason)
 		if (zero) {
 			a = atomic_read(&cell->active);
 			WARN(a != 0, "Cell active count %u > 0\n", a);
-			call_rcu(&cell->rcu, afs_cell_destroy);
+			WARN_ON(!queue_work(afs_wq, &cell->destroyer));
 		}
 	}
 }
@@ -586,10 +578,9 @@ struct afs_cell *afs_use_cell(struct afs_cell *cell, enum afs_cell_trace reason)
 {
 	int r, a;
 
-	r = refcount_read(&cell->ref);
-	WARN_ON(r == 0);
+	__refcount_inc(&cell->ref, &r);
 	a = atomic_inc_return(&cell->active);
-	trace_afs_cell(cell->debug_id, r, a, reason);
+	trace_afs_cell(cell->debug_id, r + 1, a, reason);
 	return cell;
 }
 
@@ -597,10 +588,11 @@ struct afs_cell *afs_use_cell(struct afs_cell *cell, enum afs_cell_trace reason)
  * Record a cell becoming less active.  When the active counter reaches 1, it
  * is scheduled for destruction, but may get reactivated.
  */
-void afs_unuse_cell(struct afs_net *net, struct afs_cell *cell, enum afs_cell_trace reason)
+void afs_unuse_cell(struct afs_cell *cell, enum afs_cell_trace reason)
 {
 	unsigned int debug_id;
 	time64_t now, expire_delay;
+	bool zero;
 	int r, a;
 
 	if (!cell)
@@ -615,13 +607,15 @@ void afs_unuse_cell(struct afs_net *net, struct afs_cell *cell, enum afs_cell_tr
 		expire_delay = afs_cell_gc_delay;
 
 	debug_id = cell->debug_id;
-	r = refcount_read(&cell->ref);
 	a = atomic_dec_return(&cell->active);
-	trace_afs_cell(debug_id, r, a, reason);
-	WARN_ON(a == 0);
-	if (a == 1)
+	if (!a)
 		/* 'cell' may now be garbage collected. */
-		afs_set_cell_timer(net, expire_delay);
+		afs_set_cell_timer(cell, expire_delay);
+
+	zero = __refcount_dec_and_test(&cell->ref, &r);
+	trace_afs_cell(debug_id, r - 1, a, reason);
+	if (zero)
+		WARN_ON(!queue_work(afs_wq, &cell->destroyer));
 }
 
 /*
@@ -641,9 +635,27 @@ void afs_see_cell(struct afs_cell *cell, enum afs_cell_trace reason)
  */
 void afs_queue_cell(struct afs_cell *cell, enum afs_cell_trace reason)
 {
-	afs_get_cell(cell, reason);
-	if (!queue_work(afs_wq, &cell->manager))
-		afs_put_cell(cell, afs_cell_trace_put_queue_fail);
+	queue_work(afs_wq, &cell->manager);
+}
+
+/*
+ * Cell-specific management timer.
+ */
+static void afs_cell_timer(struct timer_list *timer)
+{
+	struct afs_cell *cell = container_of(timer, struct afs_cell, management_timer);
+
+	afs_see_cell(cell, afs_cell_trace_see_mgmt_timer);
+	if (refcount_read(&cell->ref) > 0 && cell->net->live)
+		queue_work(afs_wq, &cell->manager);
+}
+
+/*
+ * Set/reduce the cell timer.
+ */
+void afs_set_cell_timer(struct afs_cell *cell, unsigned int delay_secs)
+{
+	timer_reduce(&cell->management_timer, jiffies + delay_secs * HZ);
 }
 
 /*
@@ -705,7 +717,6 @@ static int afs_activate_cell(struct afs_net *net, struct afs_cell *cell)
 	if (cell->proc_link.next)
 		cell->proc_link.next->pprev = &cell->proc_link.next;
 
-	afs_dynroot_mkdir(net, cell);
 	mutex_unlock(&net->proc_cells_lock);
 	return 0;
 }
@@ -722,241 +733,162 @@ static void afs_deactivate_cell(struct afs_net *net, struct afs_cell *cell)
 	mutex_lock(&net->proc_cells_lock);
 	if (!hlist_unhashed(&cell->proc_link))
 		hlist_del_rcu(&cell->proc_link);
-	afs_dynroot_rmdir(net, cell);
 	mutex_unlock(&net->proc_cells_lock);
 
 	_leave("");
 }
 
+static bool afs_has_cell_expired(struct afs_cell *cell, time64_t *_next_manage)
+{
+	const struct afs_vlserver_list *vllist;
+	time64_t expire_at = cell->last_inactive;
+	time64_t now = ktime_get_real_seconds();
+
+	if (atomic_read(&cell->active))
+		return false;
+	if (!cell->net->live)
+		return true;
+
+	vllist = rcu_dereference_protected(cell->vl_servers, true);
+	if (vllist && vllist->nr_servers > 0)
+		expire_at += afs_cell_gc_delay;
+
+	if (expire_at <= now)
+		return true;
+	if (expire_at < *_next_manage)
+		*_next_manage = expire_at;
+	return false;
+}
+
 /*
  * Manage a cell record, initialising and destroying it, maintaining its DNS
  * records.
  */
-static void afs_manage_cell(struct afs_cell *cell)
+static bool afs_manage_cell(struct afs_cell *cell)
 {
 	struct afs_net *net = cell->net;
-	int ret, active;
+	time64_t next_manage = TIME64_MAX;
+	int ret;
 
 	_enter("%s", cell->name);
 
-again:
 	_debug("state %u", cell->state);
 	switch (cell->state) {
-	case AFS_CELL_INACTIVE:
-	case AFS_CELL_FAILED:
-		down_write(&net->cells_lock);
-		active = 1;
-		if (atomic_try_cmpxchg_relaxed(&cell->active, &active, 0)) {
-			rb_erase(&cell->net_node, &net->cells);
-			trace_afs_cell(cell->debug_id, refcount_read(&cell->ref), 0,
-				       afs_cell_trace_unuse_delete);
-			smp_store_release(&cell->state, AFS_CELL_REMOVED);
-		}
-		up_write(&net->cells_lock);
-		if (cell->state == AFS_CELL_REMOVED) {
-			wake_up_var(&cell->state);
-			goto final_destruction;
-		}
-		if (cell->state == AFS_CELL_FAILED)
-			goto done;
-		smp_store_release(&cell->state, AFS_CELL_UNSET);
-		wake_up_var(&cell->state);
-		goto again;
-
-	case AFS_CELL_UNSET:
-		smp_store_release(&cell->state, AFS_CELL_ACTIVATING);
-		wake_up_var(&cell->state);
-		goto again;
-
-	case AFS_CELL_ACTIVATING:
-		ret = afs_activate_cell(net, cell);
-		if (ret < 0)
-			goto activation_failed;
+	case AFS_CELL_SETTING_UP:
+		goto set_up_cell;
+	case AFS_CELL_ACTIVE:
+		goto cell_is_active;
+	case AFS_CELL_REMOVING:
+		WARN_ON_ONCE(1);
+		return false;
+	case AFS_CELL_DEAD:
+		return false;
+	default:
+		_debug("bad state %u", cell->state);
+		WARN_ON_ONCE(1); /* Unhandled state */
+		return false;
+	}
 
-		smp_store_release(&cell->state, AFS_CELL_ACTIVE);
-		wake_up_var(&cell->state);
-		goto again;
+set_up_cell:
+	ret = afs_activate_cell(net, cell);
+	if (ret < 0) {
+		cell->error = ret;
+		goto remove_cell;
+	}
 
-	case AFS_CELL_ACTIVE:
-		if (atomic_read(&cell->active) > 1) {
-			if (test_and_clear_bit(AFS_CELL_FL_DO_LOOKUP, &cell->flags)) {
-				ret = afs_update_cell(cell);
-				if (ret < 0)
-					cell->error = ret;
-			}
-			goto done;
-		}
-		smp_store_release(&cell->state, AFS_CELL_DEACTIVATING);
-		wake_up_var(&cell->state);
-		goto again;
+	afs_set_cell_state(cell, AFS_CELL_ACTIVE);
+
+cell_is_active:
+	if (afs_has_cell_expired(cell, &next_manage))
+		goto remove_cell;
 
-	case AFS_CELL_DEACTIVATING:
-		if (atomic_read(&cell->active) > 1)
-			goto reverse_deactivation;
-		afs_deactivate_cell(net, cell);
-		smp_store_release(&cell->state, AFS_CELL_INACTIVE);
-		wake_up_var(&cell->state);
-		goto again;
+	if (test_and_clear_bit(AFS_CELL_FL_DO_LOOKUP, &cell->flags)) {
+		ret = afs_update_cell(cell);
+		if (ret < 0)
+			cell->error = ret;
+	}
 
-	case AFS_CELL_REMOVED:
-		goto done;
+	if (next_manage < TIME64_MAX && cell->net->live) {
+		time64_t now = ktime_get_real_seconds();
 
-	default:
-		break;
+		if (next_manage - now <= 0)
+			afs_queue_cell(cell, afs_cell_trace_queue_again);
+		else
+			afs_set_cell_timer(cell, next_manage - now);
 	}
-	_debug("bad state %u", cell->state);
-	BUG(); /* Unhandled state */
+	_leave(" [done %u]", cell->state);
+	return false;
 
-activation_failed:
-	cell->error = ret;
-	afs_deactivate_cell(net, cell);
+remove_cell:
+	down_write(&net->cells_lock);
 
-	smp_store_release(&cell->state, AFS_CELL_FAILED); /* vs error */
-	wake_up_var(&cell->state);
-	goto again;
+	if (atomic_read(&cell->active)) {
+		up_write(&net->cells_lock);
+		goto cell_is_active;
+	}
 
-reverse_deactivation:
-	smp_store_release(&cell->state, AFS_CELL_ACTIVE);
-	wake_up_var(&cell->state);
-	_leave(" [deact->act]");
-	return;
+	/* Make sure that the expiring server records are going to see the fact
+	 * that the cell is caput.
+	 */
+	afs_set_cell_state(cell, AFS_CELL_REMOVING);
 
-done:
-	_leave(" [done %u]", cell->state);
-	return;
+	afs_deactivate_cell(net, cell);
+	afs_purge_servers(cell);
+
+	rb_erase(&cell->net_node, &net->cells);
+	afs_see_cell(cell, afs_cell_trace_unuse_delete);
+	up_write(&net->cells_lock);
 
-final_destruction:
 	/* The root volume is pinning the cell */
 	afs_put_volume(cell->root_volume, afs_volume_trace_put_cell_root);
 	cell->root_volume = NULL;
-	afs_put_cell(cell, afs_cell_trace_put_destroy);
+
+	afs_set_cell_state(cell, AFS_CELL_DEAD);
+	return true;
 }
 
 static void afs_manage_cell_work(struct work_struct *work)
 {
 	struct afs_cell *cell = container_of(work, struct afs_cell, manager);
+	bool final_put;
 
-	afs_manage_cell(cell);
-	afs_put_cell(cell, afs_cell_trace_put_queue_work);
+	afs_see_cell(cell, afs_cell_trace_manage);
+	final_put = afs_manage_cell(cell);
+	afs_see_cell(cell, afs_cell_trace_managed);
+	if (final_put)
+		afs_put_cell(cell, afs_cell_trace_put_final);
 }
 
 /*
- * Manage the records of cells known to a network namespace.  This includes
- * updating the DNS records and garbage collecting unused cells that were
- * automatically added.
- *
- * Note that constructed cell records may only be removed from net->cells by
- * this work item, so it is safe for this work item to stash a cursor pointing
- * into the tree and then return to caller (provided it skips cells that are
- * still under construction).
- *
- * Note also that we were given an increment on net->cells_outstanding by
- * whoever queued us that we need to deal with before returning.
+ * Purge in-memory cell database.
  */
-void afs_manage_cells(struct work_struct *work)
+void afs_cell_purge(struct afs_net *net)
 {
-	struct afs_net *net = container_of(work, struct afs_net, cells_manager);
+	struct afs_cell *ws;
 	struct rb_node *cursor;
-	time64_t now = ktime_get_real_seconds(), next_manage = TIME64_MAX;
-	bool purging = !net->live;
 
 	_enter("");
 
-	/* Trawl the cell database looking for cells that have expired from
-	 * lack of use and cells whose DNS results have expired and dispatch
-	 * their managers.
-	 */
-	down_read(&net->cells_lock);
+	down_write(&net->cells_lock);
+	ws = rcu_replace_pointer(net->ws_cell, NULL,
+				 lockdep_is_held(&net->cells_lock));
+	up_write(&net->cells_lock);
+	afs_unuse_cell(ws, afs_cell_trace_unuse_ws);
 
+	_debug("kick cells");
+	down_read(&net->cells_lock);
 	for (cursor = rb_first(&net->cells); cursor; cursor = rb_next(cursor)) {
-		struct afs_cell *cell =
-			rb_entry(cursor, struct afs_cell, net_node);
-		unsigned active;
-		bool sched_cell = false;
-
-		active = atomic_read(&cell->active);
-		trace_afs_cell(cell->debug_id, refcount_read(&cell->ref),
-			       active, afs_cell_trace_manage);
-
-		ASSERTCMP(active, >=, 1);
-
-		if (purging) {
-			if (test_and_clear_bit(AFS_CELL_FL_NO_GC, &cell->flags)) {
-				active = atomic_dec_return(&cell->active);
-				trace_afs_cell(cell->debug_id, refcount_read(&cell->ref),
-					       active, afs_cell_trace_unuse_pin);
-			}
-		}
+		struct afs_cell *cell = rb_entry(cursor, struct afs_cell, net_node);
 
-		if (active == 1) {
-			struct afs_vlserver_list *vllist;
-			time64_t expire_at = cell->last_inactive;
-
-			read_lock(&cell->vl_servers_lock);
-			vllist = rcu_dereference_protected(
-				cell->vl_servers,
-				lockdep_is_held(&cell->vl_servers_lock));
-			if (vllist->nr_servers > 0)
-				expire_at += afs_cell_gc_delay;
-			read_unlock(&cell->vl_servers_lock);
-			if (purging || expire_at <= now)
-				sched_cell = true;
-			else if (expire_at < next_manage)
-				next_manage = expire_at;
-		}
+		afs_see_cell(cell, afs_cell_trace_purge);
 
-		if (!purging) {
-			if (test_bit(AFS_CELL_FL_DO_LOOKUP, &cell->flags))
-				sched_cell = true;
-		}
+		if (test_and_clear_bit(AFS_CELL_FL_NO_GC, &cell->flags))
+			afs_unuse_cell(cell, afs_cell_trace_unuse_pin);
 
-		if (sched_cell)
-			afs_queue_cell(cell, afs_cell_trace_get_queue_manage);
+		afs_queue_cell(cell, afs_cell_trace_queue_purge);
 	}
-
 	up_read(&net->cells_lock);
 
-	/* Update the timer on the way out.  We have to pass an increment on
-	 * cells_outstanding in the namespace that we are in to the timer or
-	 * the work scheduler.
-	 */
-	if (!purging && next_manage < TIME64_MAX) {
-		now = ktime_get_real_seconds();
-
-		if (next_manage - now <= 0) {
-			if (queue_work(afs_wq, &net->cells_manager))
-				atomic_inc(&net->cells_outstanding);
-		} else {
-			afs_set_cell_timer(net, next_manage - now);
-		}
-	}
-
-	afs_dec_cells_outstanding(net);
-	_leave(" [%d]", atomic_read(&net->cells_outstanding));
-}
-
-/*
- * Purge in-memory cell database.
- */
-void afs_cell_purge(struct afs_net *net)
-{
-	struct afs_cell *ws;
-
-	_enter("");
-
-	down_write(&net->cells_lock);
-	ws = net->ws_cell;
-	net->ws_cell = NULL;
-	up_write(&net->cells_lock);
-	afs_unuse_cell(net, ws, afs_cell_trace_unuse_ws);
-
-	_debug("del timer");
-	if (del_timer_sync(&net->cells_timer))
-		atomic_dec(&net->cells_outstanding);
-
-	_debug("kick mgr");
-	afs_queue_cell_manager(net);
-
 	_debug("wait");
 	wait_var_event(&net->cells_outstanding,
 		       !atomic_read(&net->cells_outstanding));