linux-kernel - Re: [RFC PATCH 05/18] drbd: use init disk helper

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Date:   Wed, 5 Oct 2022 12:09:21 +0200
From:   Christoph Böhmwalder 
        <christoph.boehmwalder@...bit.com>
To:     Chaitanya Kulkarni <kch@...dia.com>
Cc:     ogeert@...ux-m68k.org, linux-block@...r.kernel.org,
        linux-m68k@...ts.linux-m68k.org, drbd-dev@...ts.linbit.com,
        nbd@...er.debian.org, linux-mtd@...ts.infradead.org,
        linux-kernel@...r.kernel.org, axboe@...nel.dk,
        philipp.reisner@...bit.com, lars.ellenberg@...bit.com,
        efremov@...ux.com, josef@...icpanda.com, tim@...erelk.net,
        haris.iqbal@...os.com, jinpu.wang@...os.com, richard@....at,
        miquel.raynal@...tlin.com, vigneshr@...com, mcgrof@...nel.org,
        hare@...e.de, damien.lemoal@...nsource.wdc.com,
        johannes.thumshirn@....com, bvanassche@....org,
        ming.lei@...hat.com, vincent.fu@...sung.com,
        shinichiro.kawasaki@....com
Subject: Re: [RFC PATCH 05/18] drbd: use init disk helper

Am 05.10.22 um 07:00 schrieb Chaitanya Kulkarni:
> Add and use the helper to initialize the common fields of struct gendisk
> such as major, first_minor, minors, disk_name, private_data, and ops.
> This initialization is spread all over the block drivers. This avoids
> code repetation of inialization code of gendisk in current block drivers
> and any future ones.
> 
> Signed-off-by: Chaitanya Kulkarni <kch@...dia.com>
> ---
>  drivers/block/drbd/drbd_main.c | 6 +-----
>  1 file changed, 1 insertion(+), 5 deletions(-)
> 
> diff --git a/drivers/block/drbd/drbd_main.c b/drivers/block/drbd/drbd_main.c
> index f3e4db16fd07..58fae122de16 100644
> --- a/drivers/block/drbd/drbd_main.c
> +++ b/drivers/block/drbd/drbd_main.c
> @@ -2706,13 +2706,9 @@ enum drbd_ret_code drbd_create_device(struct drbd_config_context *adm_ctx, unsig
>  
>  	set_disk_ro(disk, true);
>  
> -	disk->major = DRBD_MAJOR;
> -	disk->first_minor = minor;
> -	disk->minors = 1;
> -	disk->fops = &drbd_ops;
>  	disk->flags |= GENHD_FL_NO_PART;
>  	sprintf(disk->disk_name, "drbd%d", minor);
> -	disk->private_data = device;
> +	init_disk(disk, DRBD_MAJOR, minor, 1, 0, device, &drbd_ops);
>  
>  	blk_queue_flag_set(QUEUE_FLAG_STABLE_WRITES, disk->queue);
>  	blk_queue_write_cache(disk->queue, true, true);

This now does a set_capacity(..., 0), which it did not do before.
I'm guessing this does not have any side effects as the capacity should
already be initialized to 0? Do you know this for sure?

-- 
Christoph Böhmwalder
LINBIT | Keeping the Digital World Running
DRBD HA —  Disaster Recovery — Software defined Storage