linux-kernel - Re: [PATCH v2 4/5] dm-stripe: limit chunk

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Message-ID: <0ba540a3-9434-c02a-f2ea-fa5ce13325e3@redhat.com>
Date: Mon, 23 Jun 2025 11:49:31 +0200 (CEST)
From: Mikulas Patocka <mpatocka@...hat.com>
To: John Garry <john.g.garry@...cle.com>
cc: agk@...hat.com, snitzer@...nel.org, song@...nel.org, yukuai3@...wei.com, 
    hch@....de, nilay@...ux.ibm.com, axboe@...nel.dk, dm-devel@...ts.linux.dev, 
    linux-kernel@...r.kernel.org, linux-raid@...r.kernel.org, 
    linux-block@...r.kernel.org, ojaswin@...ux.ibm.com, 
    martin.petersen@...cle.com
Subject: Re: [PATCH v2 4/5] dm-stripe: limit chunk_sectors to the stripe
 size



On Wed, 18 Jun 2025, John Garry wrote:

> Same as done for raid0, set chunk_sectors limit to appropriately set the
> atomic write size limit.
> 
> Setting chunk_sectors limit in this way overrides the stacked limit
> already calculated based on the bottom device limits. This is ok, as
> when any bios are sent to the bottom devices, the block layer will still
> respect the bottom device chunk_sectors.
> 
> Signed-off-by: John Garry <john.g.garry@...cle.com>
> ---
>  drivers/md/dm-stripe.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/md/dm-stripe.c b/drivers/md/dm-stripe.c
> index a7dc04bd55e5..5bbbdf8fc1bd 100644
> --- a/drivers/md/dm-stripe.c
> +++ b/drivers/md/dm-stripe.c
> @@ -458,6 +458,7 @@ static void stripe_io_hints(struct dm_target *ti,
>  	struct stripe_c *sc = ti->private;
>  	unsigned int chunk_size = sc->chunk_size << SECTOR_SHIFT;
>  
> +	limits->chunk_sectors = sc->chunk_size;
>  	limits->io_min = chunk_size;
>  	limits->io_opt = chunk_size * sc->stripes;
>  }
> -- 
> 2.31.1

Reviewed-by: Mikulas Patocka <mpatocka@...hat.com>