From e21031a425e568886b0be8048318ac7ded1616b7 Mon Sep 17 00:00:00 2001
From: Frederic Robra
Date: Fri, 5 Jul 2019 15:32:13 +0200
Subject: fixed some errors with multi queue

---
 src/kernel/mq.c | 37 +++++++++++++++++--------------------
 1 file changed, 17 insertions(+), 20 deletions(-)

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

diff --git a/src/kernel/mq.c b/src/kernel/mq.c
index e3407ab..3b0bde5 100644
--- a/src/kernel/mq.c
+++ b/src/kernel/mq.c
@@ -11,7 +11,7 @@
 #include "block.h"
 
 #define DNBD3_CMD_REQUEUED 1
-
+//
 //static void dnbd3_config_put(struct dnbd3_device_t *dev)
 //{
 //	if (refcount_dec_and_mutex_lock(&dev->config_refs,
@@ -44,21 +44,21 @@ static int dnbd3_send_cmd(struct dnbd3_device_t *dev, struct dnbd3_cmd *cmd, int
 	sigset_t blocked, oldset;
 	void *kaddr;
 	int result;
-
+	dev->pending = req;
 	init_msghdr(msg);
 
 	dnbd3_request.magic = dnbd3_packet_magic;
 
 	switch (req_op(req)) {
-	case REQ_OP_DISCARD:
-		printk(KERN_DEBUG "dnbd3: request operation discard on device %d\n", dev->minor);
-		break;
-	case REQ_OP_FLUSH:
-		printk(KERN_DEBUG "dnbd3: request operation flush on device %d\n", dev->minor);
-		break;
-	case REQ_OP_WRITE:
-		printk(KERN_DEBUG "dnbd3: request operation write on device %d\n", dev->minor);
-		break;
+//	case REQ_OP_DISCARD:
+//		printk(KERN_DEBUG "dnbd3: request operation discard on device %d\n", dev->minor);
+//		break;
+//	case REQ_OP_FLUSH:
+//		printk(KERN_DEBUG "dnbd3: request operation flush on device %d\n", dev->minor);
+//		break;
+//	case REQ_OP_WRITE:
+//		printk(KERN_DEBUG "dnbd3: request operation write on device %d\n", dev->minor);
+//		break;
 	case REQ_OP_READ:
 		printk(KERN_DEBUG "dnbd3: request operation read on device %d\n", dev->minor);
 		dnbd3_request.cmd = CMD_GET_BLOCK;
@@ -81,7 +81,7 @@ static int dnbd3_send_cmd(struct dnbd3_device_t *dev, struct dnbd3_cmd *cmd, int
 	iov.iov_len = sizeof(dnbd3_request);
 	if (kernel_sendmsg(dev->sock, &msg, &iov, 1, sizeof(dnbd3_request)) != sizeof(dnbd3_request)) {
 		printk(KERN_ERR "dnbd3: connection to server lost\n");
-		result = -EAGAIN;
+		result = -EIO;
 		goto error;
 	}
 
@@ -103,11 +103,6 @@ static int dnbd3_send_cmd(struct dnbd3_device_t *dev, struct dnbd3_cmd *cmd, int
 		result = -EIO;
 		goto error;
 	}
-//	if (dnbd3_reply.cmd == 0) {
-//		printk(KERN_ERR "dnbd3: command was 0\n");
-//		result = -EIO;
-//		goto error;
-//	}
 
 	if (dnbd3_reply.cmd != CMD_GET_BLOCK) {
 		printk(KERN_ERR "dnbd3: command was %d\n", dnbd3_reply.cmd);
@@ -146,8 +141,9 @@ static void dnbd3_requeue_cmd(struct dnbd3_cmd *cmd)
 {
 	struct request *req = blk_mq_rq_from_pdu(cmd);
 
-	if (!test_and_set_bit(DNBD3_CMD_REQUEUED, &cmd->flags))
+	if (!test_and_set_bit(DNBD3_CMD_REQUEUED, &cmd->flags)) {
 		blk_mq_requeue_request(req, true);
+	}
 }
 
 static int dnbd3_handle_cmd(struct dnbd3_cmd *cmd, int index)
@@ -222,10 +218,11 @@ static blk_status_t dnbd3_queue_rq(struct blk_mq_hw_ctx *hctx, const struct blk_
 
 
 	ret = dnbd3_handle_cmd(cmd, hctx->queue_num);
-	if (ret < 0)
+	if (ret < 0) {
 		ret = BLK_STS_IOERR;
-	else if (!ret)
+	} else if (!ret) {
 		ret = BLK_STS_OK;
+	}
 	mutex_unlock(&cmd->lock);
 
 	return ret;
-- 
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