Patch "dm mirror: fix read error on recovery after default leg failure" has been added to the 4.4-stable tree

Patch "dm mirror: fix read error on recovery after default leg failure" 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

    dm mirror: fix read error on recovery after default leg failure

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:
     dm-mirror-fix-read-error-on-recovery-after-default-leg-failure.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 dcb2ff56417362c31f6b430c3c531a84581e8721 Mon Sep 17 00:00:00 2001
From: Heinz Mauelshagen <heinzm@redhat.com>
Date: Mon, 10 Oct 2016 17:58:32 +0200
Subject: dm mirror: fix read error on recovery after default leg failure

From: Heinz Mauelshagen <heinzm@redhat.com>

commit dcb2ff56417362c31f6b430c3c531a84581e8721 upstream.

If a default leg has failed, any read will cause a new operational
default leg to be selected and the read is resubmitted.  But until now
the read will return failure even though it was successful due to
resubmission.  The reason for this is bio->bi_error was not being
cleared before resubmitting the bio.

Fix by clearing bio->bi_error before resubmission.

Fixes: 4246a0b63bd8 ("block: add a bi_error field to struct bio")
Signed-off-by: Heinz Mauelshagen <heinzm@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/md/dm-raid1.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/md/dm-raid1.c
+++ b/drivers/md/dm-raid1.c
@@ -1288,6 +1288,7 @@ static int mirror_end_io(struct dm_targe
 
 			dm_bio_restore(bd, bio);
 			bio_record->details.bi_bdev = NULL;
+			bio->bi_error = 0;
 
 			queue_bio(ms, bio, rw);
 			return DM_ENDIO_INCOMPLETE;


Patches currently in stable-queue which might be from heinzm@redhat.com are

queue-4.4/dm-mirror-fix-read-error-on-recovery-after-default-leg-failure.patch