[PATCH 4.19 26/44] dm: call blk_queue_split() to impose device limits on bios

From: Greg Kroah-Hartman
Date: Tue Dec 18 2018 - 11:41:22 EST

4.19-stable review patch. If anyone has any objections, please let me know.


From: Mike Snitzer <snitzer@xxxxxxxxxx>

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@xxxxxxxxxxxxxxx
Signed-off-by: Mike Snitzer <snitzer@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

drivers/md/dm.c | 2 ++
1 file changed, 2 insertions(+)

--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -1592,6 +1592,8 @@ static blk_qc_t __split_and_process_bio(
return ret;

+ blk_queue_split(md->queue, &bio);
init_clone_info(&ci, md, map, bio);

if (bio->bi_opf & REQ_PREFLUSH) {