From b64a2851ba25b3410a87d3d1b751155612105c8e Mon Sep 17 00:00:00 2001
From: Chris Mason <chris.mason@oracle.com>
Date: Wed, 20 Aug 2008 13:39:41 -0400
Subject: [PATCH] Btrfs: Wait for async bio submissions to make some progress
 at queue time

Before, the btrfs bdi congestion function was used to test for too many
async bios.  This keeps that check to throttle pdflush, but also
adds a check while queuing bios.

Signed-off-by: Chris Mason <chris.mason@oracle.com>
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