[RESEND PATCH V5 16/33] dm: clone bio via bio_clone_seg_bioset

[Ming Lei]

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 
---
 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

[RESEND PATCH V5 16/33] dm: clone bio via bio_clone_seg_bioset

[Ming Lei]

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 
---
 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