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[V6,16/30] dm: clone bio via bio_clone_chunk_bioset

Message ID 20180609123014.8861-17-ming.lei@redhat.com (mailing list archive)
State New, archived
Headers show

Commit Message

Ming Lei June 9, 2018, 12:30 p.m. UTC 
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_chunk_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 <ming.lei@redhat.com>
---
 drivers/md/dm.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
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Patch

diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 98dff36b89a3..13ca3574d972 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -1582,8 +1582,8 @@  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_chunk_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);