From 23e585f4af267808c2ed0c69430207d7d7716a5b Mon Sep 17 00:00:00 2001
From: Frederic Robra
Date: Sun, 14 Jul 2019 20:04:45 +0200
Subject: device now errors if connection get closed

---
 src/kernel/core.c | 30 ++++++++++++++++++++++++++----
 1 file changed, 26 insertions(+), 4 deletions(-)

(limited to 'src/kernel/core.c')

diff --git a/src/kernel/core.c b/src/kernel/core.c
index 8f02900..4704b0d 100644
--- a/src/kernel/core.c
+++ b/src/kernel/core.c
@@ -77,8 +77,10 @@ static int dnbd3_handle_cmd(struct dnbd3_cmd *cmd, int index)
 {
 	struct request *req = blk_mq_rq_from_pdu(cmd);
 	struct dnbd3_device *dev = cmd->dnbd3;
-	struct dnbd3_sock *sock;
+	struct dnbd3_sock *sock = NULL;
 	int ret = -1;
+	int i;
+	int sock_alive = 0;
 
 	printk(KERN_DEBUG "dnbd3: handle request at position %lu and size %d, device %i\n", blk_rq_pos(req), blk_rq_bytes(req), dev->minor);
 
@@ -89,11 +91,24 @@ static int dnbd3_handle_cmd(struct dnbd3_cmd *cmd, int index)
 //		return -EINVAL;
 //	}
 
-	sock = &dev->socks[index];
-	if (!sock->sock) {
+	for (i = 0; i < NUMBER_CONNECTIONS; i++) {
+		if (dev->socks[i].sock && dev->socks[i].server) {
+			if (index == sock_alive) {
+				sock = &dev->socks[index];
+			}
+			sock_alive++;
+		}
+	}
+
+	if (!sock) {
 		printk(KERN_INFO "dnbd3: index is %d but no socket was found\n", index);
 		dev_err_ratelimited(disk_to_dev(dev->disk), "attempted send on invalid socket\n");
-		blk_mq_start_request(req);
+		if (sock_alive > 0) {
+			blk_mq_update_nr_hw_queues(&dev->tag_set, sock_alive);
+			blk_mq_start_request(req);
+			return -EINVAL;
+		}
+		blk_mq_end_request(req, BLK_STS_IOERR);
 		return -EINVAL;
 	}
 
@@ -188,6 +203,7 @@ static enum blk_eh_timer_return dnbd3_xmit_timeout(struct request *req, bool res
 	dev_err_ratelimited(disk_to_dev(dev->disk), "connection timed out\n");
 	cmd->status = BLK_STS_IOERR;
 	blk_mq_complete_request(req);
+	blk_mq_end_request(req, BLK_STS_TIMEOUT);
 	return BLK_EH_DONE;
 }
 
@@ -292,6 +308,8 @@ static int dnbd3_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd
 			kfree(dev->imgname);
 			dev->imgname = NULL;
 		}
+		dev->rid = 0;
+		dev->reported_size = 0;
 		break;
 
 	case IOCTL_SWITCH:
@@ -506,6 +524,10 @@ static void dnbd3_dev_remove(struct dnbd3_device *dnbd3)
 		dnbd3_net_disconnect(dnbd3);
 		disk->private_data = NULL;
 		put_disk(disk);
+		if (dnbd3->imgname) {
+			kfree(dnbd3->imgname);
+			dnbd3->imgname = NULL;
+		}
 	}
 	mutex_destroy(&dnbd3->device_lock);
 }
-- 
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