1 files changed, 86 insertions, 156 deletions

diff --git a/drivers/block/drbd/drbd_nl.c b/drivers/block/drbd/drbd_nl.c
index 44ccf8b4f4b2..864c98e74875 100644
--- a/drivers/block/drbd/drbd_nl.c
+++ b/drivers/block/drbd/drbd_nl.c
@@ -770,6 +770,7 @@ int drbd_adm_set_role(struct sk_buff *skb, struct genl_info *info)
 	struct set_role_parms parms;
 	int err;
 	enum drbd_ret_code retcode;
+	enum drbd_state_rv rv;
 
 	retcode = drbd_adm_prepare(&adm_ctx, skb, info, DRBD_ADM_NEED_MINOR);
 	if (!adm_ctx.reply_skb)
@@ -790,14 +791,14 @@ int drbd_adm_set_role(struct sk_buff *skb, struct genl_info *info)
 	mutex_lock(&adm_ctx.resource->adm_mutex);
 
 	if (info->genlhdr->cmd == DRBD_ADM_PRIMARY)
-		retcode = (enum drbd_ret_code)drbd_set_role(adm_ctx.device,
-						R_PRIMARY, parms.assume_uptodate);
+		rv = drbd_set_role(adm_ctx.device, R_PRIMARY, parms.assume_uptodate);
 	else
-		retcode = (enum drbd_ret_code)drbd_set_role(adm_ctx.device,
-						R_SECONDARY, 0);
+		rv = drbd_set_role(adm_ctx.device, R_SECONDARY, 0);
 
 	mutex_unlock(&adm_ctx.resource->adm_mutex);
 	genl_lock();
+	drbd_adm_finish(&adm_ctx, info, rv);
+	return 0;
 out:
 	drbd_adm_finish(&adm_ctx, info, retcode);
 	return 0;
@@ -1204,50 +1205,40 @@ static unsigned int drbd_max_discard_sectors(struct drbd_connection *connection)
 }
 
 static void decide_on_discard_support(struct drbd_device *device,
-			struct request_queue *q,
-			struct request_queue *b,
-			bool discard_zeroes_if_aligned)
+		struct drbd_backing_dev *bdev)
 {
-	/* q = drbd device queue (device->rq_queue)
-	 * b = backing device queue (device->ldev->backing_bdev->bd_disk->queue),
-	 *     or NULL if diskless
-	 */
-	struct drbd_connection *connection = first_peer_device(device)->connection;
-	bool can_do = b ? blk_queue_discard(b) : true;
-
-	if (can_do && connection->cstate >= C_CONNECTED && !(connection->agreed_features & DRBD_FF_TRIM)) {
-		can_do = false;
-		drbd_info(connection, "peer DRBD too old, does not support TRIM: disabling discards\n");
-	}
-	if (can_do) {
-		/* We don't care for the granularity, really.
-		 * Stacking limits below should fix it for the local
-		 * device.  Whether or not it is a suitable granularity
-		 * on the remote device is not our problem, really. If
-		 * you care, you need to use devices with similar
-		 * topology on all peers. */
-		blk_queue_discard_granularity(q, 512);
-		q->limits.max_discard_sectors = drbd_max_discard_sectors(connection);
-		blk_queue_flag_set(QUEUE_FLAG_DISCARD, q);
-		q->limits.max_write_zeroes_sectors = drbd_max_discard_sectors(connection);
-	} else {
-		blk_queue_flag_clear(QUEUE_FLAG_DISCARD, q);
-		blk_queue_discard_granularity(q, 0);
-		q->limits.max_discard_sectors = 0;
-		q->limits.max_write_zeroes_sectors = 0;
-	}
-}
+	struct drbd_connection *connection =
+		first_peer_device(device)->connection;
+	struct request_queue *q = device->rq_queue;
 
-static void fixup_discard_if_not_supported(struct request_queue *q)
-{
-	/* To avoid confusion, if this queue does not support discard, clear
-	 * max_discard_sectors, which is what lsblk -D reports to the user.
-	 * Older kernels got this wrong in "stack limits".
-	 * */
-	if (!blk_queue_discard(q)) {
-		blk_queue_max_discard_sectors(q, 0);
-		blk_queue_discard_granularity(q, 0);
+	if (bdev && !bdev_max_discard_sectors(bdev->backing_bdev))
+		goto not_supported;
+
+	if (connection->cstate >= C_CONNECTED &&
+	    !(connection->agreed_features & DRBD_FF_TRIM)) {
+		drbd_info(connection,
+			"peer DRBD too old, does not support TRIM: disabling discards\n");
+		goto not_supported;
 	}
+
+	/*
+	 * We don't care for the granularity, really.
+	 *
+	 * Stacking limits below should fix it for the local device.  Whether or
+	 * not it is a suitable granularity on the remote device is not our
+	 * problem, really. If you care, you need to use devices with similar
+	 * topology on all peers.
+	 */
+	blk_queue_discard_granularity(q, 512);
+	q->limits.max_discard_sectors = drbd_max_discard_sectors(connection);
+	q->limits.max_write_zeroes_sectors =
+		drbd_max_discard_sectors(connection);
+	return;
+
+not_supported:
+	blk_queue_discard_granularity(q, 0);
+	q->limits.max_discard_sectors = 0;
+	q->limits.max_write_zeroes_sectors = 0;
 }
 
 static void fixup_write_zeroes(struct drbd_device *device, struct request_queue *q)
@@ -1265,71 +1256,6 @@ static void fixup_write_zeroes(struct drbd_device *device, struct request_queue
 		q->limits.max_write_zeroes_sectors = 0;
 }
 
-static void decide_on_write_same_support(struct drbd_device *device,
-			struct request_queue *q,
-			struct request_queue *b, struct o_qlim *o,
-			bool disable_write_same)
-{
-	struct drbd_peer_device *peer_device = first_peer_device(device);
-	struct drbd_connection *connection = peer_device->connection;
-	bool can_do = b ? b->limits.max_write_same_sectors : true;
-
-	if (can_do && disable_write_same) {
-		can_do = false;
-		drbd_info(peer_device, "WRITE_SAME disabled by config\n");
-	}
-
-	if (can_do && connection->cstate >= C_CONNECTED && !(connection->agreed_features & DRBD_FF_WSAME)) {
-		can_do = false;
-		drbd_info(peer_device, "peer does not support WRITE_SAME\n");
-	}
-
-	if (o) {
-		/* logical block size; queue_logical_block_size(NULL) is 512 */
-		unsigned int peer_lbs = be32_to_cpu(o->logical_block_size);
-		unsigned int me_lbs_b = queue_logical_block_size(b);
-		unsigned int me_lbs = queue_logical_block_size(q);
-
-		if (me_lbs_b != me_lbs) {
-			drbd_warn(device,
-				"logical block size of local backend does not match (drbd:%u, backend:%u); was this a late attach?\n",
-				me_lbs, me_lbs_b);
-			/* rather disable write same than trigger some BUG_ON later in the scsi layer. */
-			can_do = false;
-		}
-		if (me_lbs_b != peer_lbs) {
-			drbd_warn(peer_device, "logical block sizes do not match (me:%u, peer:%u); this may cause problems.\n",
-				me_lbs, peer_lbs);
-			if (can_do) {
-				drbd_dbg(peer_device, "logical block size mismatch: WRITE_SAME disabled.\n");
-				can_do = false;
-			}
-			me_lbs = max(me_lbs, me_lbs_b);
-			/* We cannot change the logical block size of an in-use queue.
-			 * We can only hope that access happens to be properly aligned.
-			 * If not, the peer will likely produce an IO error, and detach. */
-			if (peer_lbs > me_lbs) {
-				if (device->state.role != R_PRIMARY) {
-					blk_queue_logical_block_size(q, peer_lbs);
-					drbd_warn(peer_device, "logical block size set to %u\n", peer_lbs);
-				} else {
-					drbd_warn(peer_device,
-						"current Primary must NOT adjust logical block size (%u -> %u); hope for the best.\n",
-						me_lbs, peer_lbs);
-				}
-			}
-		}
-		if (can_do && !o->write_same_capable) {
-			/* If we introduce an open-coded write-same loop on the receiving side,
-			 * the peer would present itself as "capable". */
-			drbd_dbg(peer_device, "WRITE_SAME disabled (peer device not capable)\n");
-			can_do = false;
-		}
-	}
-
-	blk_queue_max_write_same_sectors(q, can_do ? DRBD_MAX_BBIO_SECTORS : 0);
-}
-
 static void drbd_setup_queue_param(struct drbd_device *device, struct drbd_backing_dev *bdev,
 				   unsigned int max_bio_size, struct o_qlim *o)
 {
@@ -1338,8 +1264,6 @@ static void drbd_setup_queue_param(struct drbd_device *device, struct drbd_backi
 	unsigned int max_segments = 0;
 	struct request_queue *b = NULL;
 	struct disk_conf *dc;
-	bool discard_zeroes_if_aligned = true;
-	bool disable_write_same = false;
 
 	if (bdev) {
 		b = bdev->backing_bdev->bd_disk->queue;
@@ -1348,8 +1272,6 @@ static void drbd_setup_queue_param(struct drbd_device *device, struct drbd_backi
 		rcu_read_lock();
 		dc = rcu_dereference(device->ldev->disk_conf);
 		max_segments = dc->max_bio_bvecs;
-		discard_zeroes_if_aligned = dc->discard_zeroes_if_aligned;
-		disable_write_same = dc->disable_write_same;
 		rcu_read_unlock();
 
 		blk_set_stacking_limits(&q->limits);
@@ -1359,14 +1281,12 @@ static void drbd_setup_queue_param(struct drbd_device *device, struct drbd_backi
 	/* This is the workaround for "bio would need to, but cannot, be split" */
 	blk_queue_max_segments(q, max_segments ? max_segments : BLK_MAX_SEGMENTS);
 	blk_queue_segment_boundary(q, PAGE_SIZE-1);
-	decide_on_discard_support(device, q, b, discard_zeroes_if_aligned);
-	decide_on_write_same_support(device, q, b, o, disable_write_same);
+	decide_on_discard_support(device, bdev);
 
 	if (b) {
 		blk_stack_limits(&q->limits, &b->limits, 0);
 		disk_update_readahead(device->vdisk);
 	}
-	fixup_discard_if_not_supported(q);
 	fixup_write_zeroes(device, q);
 }
 
@@ -1505,14 +1425,14 @@ static bool write_ordering_changed(struct disk_conf *a, struct disk_conf *b)
 static void sanitize_disk_conf(struct drbd_device *device, struct disk_conf *disk_conf,
 			       struct drbd_backing_dev *nbc)
 {
-	struct request_queue * const q = nbc->backing_bdev->bd_disk->queue;
+	struct block_device *bdev = nbc->backing_bdev;
 
 	if (disk_conf->al_extents < DRBD_AL_EXTENTS_MIN)
 		disk_conf->al_extents = DRBD_AL_EXTENTS_MIN;
 	if (disk_conf->al_extents > drbd_al_extents_max(nbc))
 		disk_conf->al_extents = drbd_al_extents_max(nbc);
 
-	if (!blk_queue_discard(q)) {
+	if (!bdev_max_discard_sectors(bdev)) {
 		if (disk_conf->rs_discard_granularity) {
 			disk_conf->rs_discard_granularity = 0; /* disable feature */
 			drbd_info(device, "rs_discard_granularity feature disabled\n");
@@ -1521,16 +1441,19 @@ static void sanitize_disk_conf(struct drbd_device *device, struct disk_conf *dis
 
 	if (disk_conf->rs_discard_granularity) {
 		int orig_value = disk_conf->rs_discard_granularity;
+		sector_t discard_size = bdev_max_discard_sectors(bdev) << 9;
+		unsigned int discard_granularity = bdev_discard_granularity(bdev);
 		int remainder;
 
-		if (q->limits.discard_granularity > disk_conf->rs_discard_granularity)
-			disk_conf->rs_discard_granularity = q->limits.discard_granularity;
+		if (discard_granularity > disk_conf->rs_discard_granularity)
+			disk_conf->rs_discard_granularity = discard_granularity;
 
-		remainder = disk_conf->rs_discard_granularity % q->limits.discard_granularity;
+		remainder = disk_conf->rs_discard_granularity %
+				discard_granularity;
 		disk_conf->rs_discard_granularity += remainder;
 
-		if (disk_conf->rs_discard_granularity > q->limits.max_discard_sectors << 9)
-			disk_conf->rs_discard_granularity = q->limits.max_discard_sectors << 9;
+		if (disk_conf->rs_discard_granularity > discard_size)
+			disk_conf->rs_discard_granularity = discard_size;
 
 		if (disk_conf->rs_discard_granularity != orig_value)
 			drbd_info(device, "rs_discard_granularity changed to %d\n",
@@ -1666,8 +1589,8 @@ int drbd_adm_disk_opts(struct sk_buff *skb, struct genl_info *info)
 	if (write_ordering_changed(old_disk_conf, new_disk_conf))
 		drbd_bump_write_ordering(device->resource, NULL, WO_BDEV_FLUSH);
 
-	if (old_disk_conf->discard_zeroes_if_aligned != new_disk_conf->discard_zeroes_if_aligned
-	||  old_disk_conf->disable_write_same != new_disk_conf->disable_write_same)
+	if (old_disk_conf->discard_zeroes_if_aligned !=
+	    new_disk_conf->discard_zeroes_if_aligned)
 		drbd_reconsider_queue_parameters(device, device->ldev, NULL);
 
 	drbd_md_sync(device);
@@ -1679,8 +1602,7 @@ int drbd_adm_disk_opts(struct sk_buff *skb, struct genl_info *info)
 			drbd_send_sync_param(peer_device);
 	}
 
-	synchronize_rcu();
-	kfree(old_disk_conf);
+	kvfree_rcu(old_disk_conf);
 	kfree(old_plan);
 	mod_timer(&device->request_timer, jiffies + HZ);
 	goto success;
@@ -2511,8 +2433,7 @@ int drbd_adm_net_opts(struct sk_buff *skb, struct genl_info *info)
 
 	mutex_unlock(&connection->resource->conf_update);
 	mutex_unlock(&connection->data.mutex);
-	synchronize_rcu();
-	kfree(old_net_conf);
+	kvfree_rcu(old_net_conf);
 
 	if (connection->cstate >= C_WF_REPORT_PARAMS) {
 		struct drbd_peer_device *peer_device;
@@ -2570,6 +2491,7 @@ int drbd_adm_connect(struct sk_buff *skb, struct genl_info *info)
 	struct drbd_resource *resource;
 	struct drbd_connection *connection;
 	enum drbd_ret_code retcode;
+	enum drbd_state_rv rv;
 	int i;
 	int err;
 
@@ -2689,12 +2611,11 @@ int drbd_adm_connect(struct sk_buff *skb, struct genl_info *info)
 	}
 	rcu_read_unlock();
 
-	retcode = (enum drbd_ret_code)conn_request_state(connection,
-					NS(conn, C_UNCONNECTED), CS_VERBOSE);
+	rv = conn_request_state(connection, NS(conn, C_UNCONNECTED), CS_VERBOSE);
 
 	conn_reconfig_done(connection);
 	mutex_unlock(&adm_ctx.resource->adm_mutex);
-	drbd_adm_finish(&adm_ctx, info, retcode);
+	drbd_adm_finish(&adm_ctx, info, rv);
 	return 0;
 
 fail:
@@ -2802,11 +2723,12 @@ int drbd_adm_disconnect(struct sk_buff *skb, struct genl_info *info)
 
 	mutex_lock(&adm_ctx.resource->adm_mutex);
 	rv = conn_try_disconnect(connection, parms.force_disconnect);
-	if (rv < SS_SUCCESS)
-		retcode = (enum drbd_ret_code)rv;
-	else
-		retcode = NO_ERROR;
 	mutex_unlock(&adm_ctx.resource->adm_mutex);
+	if (rv < SS_SUCCESS) {
+		drbd_adm_finish(&adm_ctx, info, rv);
+		return 0;
+	}
+	retcode = NO_ERROR;
  fail:
 	drbd_adm_finish(&adm_ctx, info, retcode);
 	return 0;
@@ -2925,8 +2847,7 @@ int drbd_adm_resize(struct sk_buff *skb, struct genl_info *info)
 		new_disk_conf->disk_size = (sector_t)rs.resize_size;
 		rcu_assign_pointer(device->ldev->disk_conf, new_disk_conf);
 		mutex_unlock(&device->resource->conf_update);
-		synchronize_rcu();
-		kfree(old_disk_conf);
+		kvfree_rcu(old_disk_conf);
 		new_disk_conf = NULL;
 	}
 
@@ -4617,7 +4538,7 @@ static int nla_put_notification_header(struct sk_buff *msg,
 	return drbd_notification_header_to_skb(msg, &nh, true);
 }
 
-void notify_resource_state(struct sk_buff *skb,
+int notify_resource_state(struct sk_buff *skb,
 			   unsigned int seq,
 			   struct drbd_resource *resource,
 			   struct resource_info *resource_info,
@@ -4659,16 +4580,17 @@ void notify_resource_state(struct sk_buff *skb,
 		if (err && err != -ESRCH)
 			goto failed;
 	}
-	return;
+	return 0;
 
 nla_put_failure:
 	nlmsg_free(skb);
 failed:
 	drbd_err(resource, "Error %d while broadcasting event. Event seq:%u\n",
 			err, seq);
+	return err;
 }
 
-void notify_device_state(struct sk_buff *skb,
+int notify_device_state(struct sk_buff *skb,
 			 unsigned int seq,
 			 struct drbd_device *device,
 			 struct device_info *device_info,
@@ -4708,16 +4630,17 @@ void notify_device_state(struct sk_buff *skb,
 		if (err && err != -ESRCH)
 			goto failed;
 	}
-	return;
+	return 0;
 
 nla_put_failure:
 	nlmsg_free(skb);
 failed:
 	drbd_err(device, "Error %d while broadcasting event. Event seq:%u\n",
 		 err, seq);
+	return err;
 }
 
-void notify_connection_state(struct sk_buff *skb,
+int notify_connection_state(struct sk_buff *skb,
 			     unsigned int seq,
 			     struct drbd_connection *connection,
 			     struct connection_info *connection_info,
@@ -4757,16 +4680,17 @@ void notify_connection_state(struct sk_buff *skb,
 		if (err && err != -ESRCH)
 			goto failed;
 	}
-	return;
+	return 0;
 
 nla_put_failure:
 	nlmsg_free(skb);
 failed:
 	drbd_err(connection, "Error %d while broadcasting event. Event seq:%u\n",
 		 err, seq);
+	return err;
 }
 
-void notify_peer_device_state(struct sk_buff *skb,
+int notify_peer_device_state(struct sk_buff *skb,
 			      unsigned int seq,
 			      struct drbd_peer_device *peer_device,
 			      struct peer_device_info *peer_device_info,
@@ -4807,13 +4731,14 @@ void notify_peer_device_state(struct sk_buff *skb,
 		if (err && err != -ESRCH)
 			goto failed;
 	}
-	return;
+	return 0;
 
 nla_put_failure:
 	nlmsg_free(skb);
 failed:
 	drbd_err(peer_device, "Error %d while broadcasting event. Event seq:%u\n",
 		 err, seq);
+	return err;
 }
 
 void notify_helper(enum drbd_notification_type type,
@@ -4827,7 +4752,7 @@ void notify_helper(enum drbd_notification_type type,
 	struct drbd_genlmsghdr *dh;
 	int err;
 
-	strlcpy(helper_info.helper_name, name, sizeof(helper_info.helper_name));
+	strscpy(helper_info.helper_name, name, sizeof(helper_info.helper_name));
 	helper_info.helper_name_len = min(strlen(name), sizeof(helper_info.helper_name));
 	helper_info.helper_status = status;
 
@@ -4864,7 +4789,7 @@ fail:
 		 err, seq);
 }
 
-static void notify_initial_state_done(struct sk_buff *skb, unsigned int seq)
+static int notify_initial_state_done(struct sk_buff *skb, unsigned int seq)
 {
 	struct drbd_genlmsghdr *dh;
 	int err;
@@ -4878,11 +4803,12 @@ static void notify_initial_state_done(struct sk_buff *skb, unsigned int seq)
 	if (nla_put_notification_header(skb, NOTIFY_EXISTS))
 		goto nla_put_failure;
 	genlmsg_end(skb, dh);
-	return;
+	return 0;
 
 nla_put_failure:
 	nlmsg_free(skb);
 	pr_err("Error %d sending event. Event seq:%u\n", err, seq);
+	return err;
 }
 
 static void free_state_changes(struct list_head *list)
@@ -4909,6 +4835,7 @@ static int get_initial_state(struct sk_buff *skb, struct netlink_callback *cb)
 	unsigned int seq = cb->args[2];
 	unsigned int n;
 	enum drbd_notification_type flags = 0;
+	int err = 0;
 
 	/* There is no need for taking notification_mutex here: it doesn't
 	   matter if the initial state events mix with later state chage
@@ -4917,32 +4844,32 @@ static int get_initial_state(struct sk_buff *skb, struct netlink_callback *cb)
 
 	cb->args[5]--;
 	if (cb->args[5] == 1) {
-		notify_initial_state_done(skb, seq);
+		err = notify_initial_state_done(skb, seq);
 		goto out;
 	}
 	n = cb->args[4]++;
 	if (cb->args[4] < cb->args[3])
 		flags |= NOTIFY_CONTINUES;
 	if (n < 1) {
-		notify_resource_state_change(skb, seq, state_change->resource,
+		err = notify_resource_state_change(skb, seq, state_change->resource,
 					     NOTIFY_EXISTS | flags);
 		goto next;
 	}
 	n--;
 	if (n < state_change->n_connections) {
-		notify_connection_state_change(skb, seq, &state_change->connections[n],
+		err = notify_connection_state_change(skb, seq, &state_change->connections[n],
 					       NOTIFY_EXISTS | flags);
 		goto next;
 	}
 	n -= state_change->n_connections;
 	if (n < state_change->n_devices) {
-		notify_device_state_change(skb, seq, &state_change->devices[n],
+		err = notify_device_state_change(skb, seq, &state_change->devices[n],
 					   NOTIFY_EXISTS | flags);
 		goto next;
 	}
 	n -= state_change->n_devices;
 	if (n < state_change->n_devices * state_change->n_connections) {
-		notify_peer_device_state_change(skb, seq, &state_change->peer_devices[n],
+		err = notify_peer_device_state_change(skb, seq, &state_change->peer_devices[n],
 						NOTIFY_EXISTS | flags);
 		goto next;
 	}
@@ -4957,7 +4884,10 @@ next:
 		cb->args[4] = 0;
 	}
 out:
-	return skb->len;
+	if (err)
+		return err;
+	else
+		return skb->len;
 }
 
 int drbd_adm_get_initial_state(struct sk_buff *skb, struct netlink_callback *cb)