From 219d33b26ac498ca472a02b9217b4e450474fc90 Mon Sep 17 00:00:00 2001
From: Liu Bo <bo.li.liu@oracle.com>
Date: Fri, 1 Sep 2017 16:14:26 -0600
Subject: [PATCH] Btrfs: remove batch plug in run_scheduled_IO

Block layer has a limit on plug, ie. BLK_MAX_REQUEST_COUNT == 16, so
we don't gain benefits by batching 64 bios here.

Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
---
 fs/btrfs/volumes.c | 6 ------
 1 file changed, 6 deletions(-)

diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index b39737568c22..b92e82d4413f 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -517,12 +517,6 @@ loop_lock:
 					 &device->work);
 			goto done;
 		}
-		/* unplug every 64 requests just for good measure */
-		if (batch_run % 64 == 0) {
-			blk_finish_plug(&plug);
-			blk_start_plug(&plug);
-			sync_pending = 0;
-		}
 	}
 
 	cond_resched();
-- 
2.30.2