Patch "bio: ensure __bio_clone_fast copies bi_partno" has been added to the 4.14-stable tree

Patch "bio: ensure __bio_clone_fast copies bi_partno" has been added to the 4.14-stable tree

[gregkh]

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

    bio: ensure __bio_clone_fast copies bi_partno

to the 4.14-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:
     bio-ensure-__bio_clone_fast-copies-bi_partno.patch
and it can be found in the queue-4.14 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 62530ed8b1d07a45dec94d46e521c0c6c2d476e6 Mon Sep 17 00:00:00 2001
From: Michael Lyle <mlyle@lyle.org>
Date: Thu, 16 Nov 2017 23:47:25 -0800
Subject: bio: ensure __bio_clone_fast copies bi_partno

From: Michael Lyle <mlyle@lyle.org>

commit 62530ed8b1d07a45dec94d46e521c0c6c2d476e6 upstream.

A new field was introduced in 74d46992e0d9, bi_partno, instead of using
bdev->bd_contains and encoding the partition information in the bi_bdev
field.  __bio_clone_fast was changed to copy the disk information, but
not the partition information.  At minimum, this regressed bcache and
caused data corruption.

Signed-off-by: Michael Lyle <mlyle@lyle.org>
Fixes: 74d46992e0d9 ("block: replace bi_bdev with a gendisk pointer and partitions index")
Reported-by: Pavel Goran <via-bcache@pvgoran.name>
Reported-by: Campbell Steven <casteven@gmail.com>
Reviewed-by: Coly Li <colyli@suse.de>
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 block/bio.c |    1 +
 1 file changed, 1 insertion(+)

--- a/block/bio.c
+++ b/block/bio.c
@@ -597,6 +597,7 @@ void __bio_clone_fast(struct bio *bio, s
 	 * so we don't set nor calculate new physical/hw segment counts here
 	 */
 	bio->bi_disk = bio_src->bi_disk;
+	bio->bi_partno = bio_src->bi_partno;
 	bio_set_flag(bio, BIO_CLONED);
 	bio->bi_opf = bio_src->bi_opf;
 	bio->bi_write_hint = bio_src->bi_write_hint;


Patches currently in stable-queue which might be from mlyle@lyle.org are

queue-4.14/bio-ensure-__bio_clone_fast-copies-bi_partno.patch