diff mbox series

[1/4] dm: fix clone_bio() to trigger blk_recount_segments()

Message ID 20190119180506.1300-2-snitzer@redhat.com (mailing list archive)
State New, archived
Headers show
Series dm: fix various issues with bio splitting code | expand

Commit Message

Mike Snitzer Jan. 19, 2019, 6:05 p.m. UTC 
DM's clone_bio() now benefits from using bio_trim() by fixing the fact
that clone_bio() wasn't clearing BIO_SEG_VALID like bio_trim() does;
which triggers blk_recount_segments() via bio_phys_segments().

Signed-off-by: Mike Snitzer <snitzer@redhat.com>
---
 drivers/md/dm.c | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

Comments

Ming Lei Jan. 21, 2019, 3:25 a.m. UTC | #1 
On Sat, Jan 19, 2019 at 01:05:03PM -0500, Mike Snitzer wrote:
> DM's clone_bio() now benefits from using bio_trim() by fixing the fact
> that clone_bio() wasn't clearing BIO_SEG_VALID like bio_trim() does;
> which triggers blk_recount_segments() via bio_phys_segments().
> 
> Signed-off-by: Mike Snitzer <snitzer@redhat.com>
> ---
>  drivers/md/dm.c | 8 ++------
>  1 file changed, 2 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/md/dm.c b/drivers/md/dm.c
> index d67c95ef8d7e..fcb97b0a5743 100644
> --- a/drivers/md/dm.c
> +++ b/drivers/md/dm.c
> @@ -1320,7 +1320,7 @@ static int clone_bio(struct dm_target_io *tio, struct bio *bio,
>  
>  	__bio_clone_fast(clone, bio);
>  
> -	if (unlikely(bio_integrity(bio) != NULL)) {
> +	if (bio_integrity(bio)) {
>  		int r;
>  
>  		if (unlikely(!dm_target_has_integrity(tio->ti->type) &&
> @@ -1336,11 +1336,7 @@ static int clone_bio(struct dm_target_io *tio, struct bio *bio,
>  			return r;
>  	}
>  
> -	bio_advance(clone, to_bytes(sector - clone->bi_iter.bi_sector));
> -	clone->bi_iter.bi_size = to_bytes(len);
> -
> -	if (unlikely(bio_integrity(bio) != NULL))
> -		bio_integrity_trim(clone);
> +	bio_trim(clone, sector - clone->bi_iter.bi_sector, len);
>  
>  	return 0;
>  }
> -- 
> 2.15.0
> 

Reviewed-by: Ming Lei <ming.lei@redhat.com>

Thanks,
Ming
diff mbox series

Patch

diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index d67c95ef8d7e..fcb97b0a5743 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -1320,7 +1320,7 @@  static int clone_bio(struct dm_target_io *tio, struct bio *bio,
 
 	__bio_clone_fast(clone, bio);
 
-	if (unlikely(bio_integrity(bio) != NULL)) {
+	if (bio_integrity(bio)) {
 		int r;
 
 		if (unlikely(!dm_target_has_integrity(tio->ti->type) &&
@@ -1336,11 +1336,7 @@  static int clone_bio(struct dm_target_io *tio, struct bio *bio,
 			return r;
 	}
 
-	bio_advance(clone, to_bytes(sector - clone->bi_iter.bi_sector));
-	clone->bi_iter.bi_size = to_bytes(len);
-
-	if (unlikely(bio_integrity(bio) != NULL))
-		bio_integrity_trim(clone);
+	bio_trim(clone, sector - clone->bi_iter.bi_sector, len);
 
 	return 0;
 }