From: Mike Snitzer <snitzer@redhat.com>
Date: Mon, 3 Dec 2018 21:47:21 +0000 (-0500)
Subject: dm: call blk_queue_split() to impose device limits on bios
X-Git-Tag: rel_imx_4.19.35_1.1.0~7766
X-Git-Url: https://git.somdevices.com/?a=commitdiff_plain;h=b543b5c0ac1c78c81f1ab3270d9464f6f45fd09e;p=linux.git

dm: call blk_queue_split() to impose device limits on bios

commit 89f5fa47476eda56402e29fff3c5097f5c2a1e19 upstream.

Otherwise the incoming bios, of various types, won't be shaped based on
the DM device's advertised limits.

Depends-on: af67c31fba ("blk: remove bio_set arg from blk_queue_split()")
Fixes: 744889b7cb ("block: don't deal with discard limit in blkdev_issue_discard()")
Cc: stable@vger.kernel.org
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 45abb54037fc..07d2949a8746 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -1592,6 +1592,8 @@ static blk_qc_t __split_and_process_bio(struct mapped_device *md,
 		return ret;
 	}
 
+	blk_queue_split(md->queue, &bio);
+
 	init_clone_info(&ci, md, map, bio);
 
 	if (bio->bi_opf & REQ_PREFLUSH) {