Patch "md/raid10: submit bio directly to replacement disk" has been added to the 4.4-stable tree

Patch "md/raid10: submit bio directly to replacement disk" has been added to the 4.4-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    md/raid10: submit bio directly to replacement disk

to the 4.4-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     md-raid10-submit-bio-directly-to-replacement-disk.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From foo@baz Thu Oct  5 10:49:14 CEST 2017
From: Shaohua Li <shli@fb.com>
Date: Thu, 23 Feb 2017 12:26:41 -0800
Subject: md/raid10: submit bio directly to replacement disk

From: Shaohua Li <shli@fb.com>


[ Upstream commit 6d399783e9d4e9bd44931501948059d24ad96ff8 ]

Commit 57c67df(md/raid10: submit IO from originating thread instead of
md thread) submits bio directly for normal disks but not for replacement
disks. There is no point we shouldn't do this for replacement disks.

Cc: NeilBrown <neilb@suse.com>
Signed-off-by: Shaohua Li <shli@fb.com>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/md/raid10.c |   19 ++++++++++++++++---
 1 file changed, 16 insertions(+), 3 deletions(-)

--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -1414,11 +1414,24 @@ retry_write:
 			mbio->bi_private = r10_bio;
 
 			atomic_inc(&r10_bio->remaining);
+
+			cb = blk_check_plugged(raid10_unplug, mddev,
+					       sizeof(*plug));
+			if (cb)
+				plug = container_of(cb, struct raid10_plug_cb,
+						    cb);
+			else
+				plug = NULL;
 			spin_lock_irqsave(&conf->device_lock, flags);
-			bio_list_add(&conf->pending_bio_list, mbio);
-			conf->pending_count++;
+			if (plug) {
+				bio_list_add(&plug->pending, mbio);
+				plug->pending_cnt++;
+			} else {
+				bio_list_add(&conf->pending_bio_list, mbio);
+				conf->pending_count++;
+			}
 			spin_unlock_irqrestore(&conf->device_lock, flags);
-			if (!mddev_check_plugged(mddev))
+			if (!plug)
 				md_wakeup_thread(mddev->thread);
 		}
 	}


Patches currently in stable-queue which might be from shli@fb.com are

queue-4.4/md-raid10-submit-bio-directly-to-replacement-disk.patch