linux-kernel - Re: [PATCH v5 3/6] block: Introduce blk_queue_get_max_write_zeroes

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <eb2a8ad1-5ac2-db7e-5e47-ee77e10fa49a@oracle.com>
Date:   Sat, 25 Jan 2020 10:38:00 +0800
From:   Bob Liu <bob.liu@...cle.com>
To:     Kirill Tkhai <ktkhai@...tuozzo.com>, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org, martin.petersen@...cle.com,
        axboe@...nel.dk, agk@...hat.com, snitzer@...hat.com,
        dm-devel@...hat.com, song@...nel.org, tytso@....edu,
        adilger.kernel@...ger.ca, Chaitanya.Kulkarni@....com,
        darrick.wong@...cle.com, ming.lei@...hat.com, osandov@...com,
        jthumshirn@...e.de, minwoo.im.dev@...il.com, damien.lemoal@....com,
        andrea.parri@...rulasolutions.com, hare@...e.com, tj@...nel.org,
        ajay.joshi@....com, sagi@...mberg.me, dsterba@...e.com,
        bvanassche@....org, dhowells@...hat.com, asml.silence@...il.com
Subject: Re: [PATCH v5 3/6] block: Introduce
 blk_queue_get_max_write_zeroes_sectors()

On 1/22/20 6:58 PM, Kirill Tkhai wrote:
> This introduces a new primitive, which returns max sectors
> for REQ_OP_WRITE_ZEROES operation.
> @op_flags is unused now, and it will be enabled in next patch.
> 
> Signed-off-by: Kirill Tkhai <ktkhai@...tuozzo.com>
> ---
>  block/blk-core.c       |    2 +-
>  block/blk-merge.c      |    9 ++++++---
>  include/linux/blkdev.h |    8 +++++++-
>  3 files changed, 14 insertions(+), 5 deletions(-)
> 

Reviewed-by: Bob Liu <bob.liu@...cle.com>

> diff --git a/block/blk-core.c b/block/blk-core.c
> index ac2634bcda1f..2edcd55624f1 100644
> --- a/block/blk-core.c
> +++ b/block/blk-core.c
> @@ -978,7 +978,7 @@ generic_make_request_checks(struct bio *bio)
>  			goto not_supported;
>  		break;
>  	case REQ_OP_WRITE_ZEROES:
> -		if (!q->limits.max_write_zeroes_sectors)
> +		if (!blk_queue_get_max_write_zeroes_sectors(q, bio->bi_opf))
>  			goto not_supported;
>  		break;
>  	default:
> diff --git a/block/blk-merge.c b/block/blk-merge.c
> index 1534ed736363..467b292bc6e8 100644
> --- a/block/blk-merge.c
> +++ b/block/blk-merge.c
> @@ -105,15 +105,18 @@ static struct bio *blk_bio_discard_split(struct request_queue *q,
>  static struct bio *blk_bio_write_zeroes_split(struct request_queue *q,
>  		struct bio *bio, struct bio_set *bs, unsigned *nsegs)
>  {
> +	unsigned int max_sectors;
> +
> +	max_sectors = blk_queue_get_max_write_zeroes_sectors(q, bio->bi_opf);
>  	*nsegs = 0;
>  
> -	if (!q->limits.max_write_zeroes_sectors)
> +	if (!max_sectors)
>  		return NULL;
>  
> -	if (bio_sectors(bio) <= q->limits.max_write_zeroes_sectors)
> +	if (bio_sectors(bio) <= max_sectors)
>  		return NULL;
>  
> -	return bio_split(bio, q->limits.max_write_zeroes_sectors, GFP_NOIO, bs);
> +	return bio_split(bio, max_sectors, GFP_NOIO, bs);
>  }
>  
>  static struct bio *blk_bio_write_same_split(struct request_queue *q,
> diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
> index 23a5850f35f6..264202fa3bf8 100644
> --- a/include/linux/blkdev.h
> +++ b/include/linux/blkdev.h
> @@ -988,6 +988,12 @@ static inline struct bio_vec req_bvec(struct request *rq)
>  	return mp_bvec_iter_bvec(rq->bio->bi_io_vec, rq->bio->bi_iter);
>  }
>  
> +static inline unsigned int blk_queue_get_max_write_zeroes_sectors(
> +		struct request_queue *q, unsigned int op_flags)
> +{
> +	return q->limits.max_write_zeroes_sectors;
> +}
> +
>  static inline unsigned int blk_queue_get_max_sectors(struct request_queue *q,
>  						     unsigned int op_flags)
>  {
> @@ -1001,7 +1007,7 @@ static inline unsigned int blk_queue_get_max_sectors(struct request_queue *q,
>  		return q->limits.max_write_same_sectors;
>  
>  	if (unlikely(op == REQ_OP_WRITE_ZEROES))
> -		return q->limits.max_write_zeroes_sectors;
> +		return blk_queue_get_max_write_zeroes_sectors(q, op_flags);
>  
>  	return q->limits.max_sectors;
>  }
> 
>