From: David Sterba <dsterba@suse.com>
Date: Thu, 15 Jun 2017 14:04:26 +0000 (+0200)
Subject: btrfs: account as waiting for IO, while waiting fot the flush bio completion
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=2980d5745fa0beeaab4c22e25bea4faa54f7d9f7;p=openwrt%2Fstaging%2Fblogic.git

btrfs: account as waiting for IO, while waiting fot the flush bio completion

Similar to what submit_bio_wait does, we should account for IO while
waiting for a bio completion. This has marginal visible effects, flush
bio is short-lived.

Reviewed-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>
---

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index bfcbab3a7607..917e29167580 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -3519,7 +3519,7 @@ static int wait_dev_flush(struct btrfs_device *device)
 		return 0;
 
 	device->flush_bio_sent = 0;
-	wait_for_completion(&device->flush_wait);
+	wait_for_completion_io(&device->flush_wait);
 
 	if (bio->bi_error) {
 		ret = bio->bi_error;