[PATCH V5 16/33] dm: clone bio via bio_clone_seg_bioset
From: Ming Lei <hidden>
Date: 2018-05-24 09:01:21
Subsystem:
device-mapper (lvm), the rest · Maintainers:
Alasdair Kergon, Mike Snitzer, Mikulas Patocka, Benjamin Marzinski, Linus Torvalds
The incoming bio will become very big after multipage bvec is enabled, so we can't clone bio page by page. This patch uses the introduced bio_clone_seg_bioset(), so the incoming bio can be cloned successfully. This way is safe because device mapping won't modify the bio vector on the cloned multipage bio. Signed-off-by: Ming Lei <redacted> --- drivers/md/dm.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index f1db181e082e..425e99e20f5c 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c@@ -1581,8 +1581,8 @@ static blk_qc_t __split_and_process_bio(struct mapped_device *md, * the usage of io->orig_bio in dm_remap_zone_report() * won't be affected by this reassignment. */ - struct bio *b = bio_clone_bioset(bio, GFP_NOIO, - md->queue->bio_split); + struct bio *b = bio_clone_seg_bioset(bio, + GFP_NOIO, md->queue->bio_split); ci.io->orig_bio = b; bio_advance(bio, (bio_sectors(bio) - ci.sector_count) << 9); bio_chain(b, bio);
--
2.9.5