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

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Date:   Wed, 5 Oct 2022 17:24:22 +0000
From:   Chaitanya Kulkarni <chaitanyak@...dia.com>
To:     Christoph Böhmwalder 
        <christoph.boehmwalder@...bit.com>,
        Chaitanya Kulkarni <chaitanyak@...dia.com>
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Subject: Re: [RFC PATCH 05/18] drbd: use init disk helper


>> 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?
> 

I think I'll move  the call to set_capcity out of the caller,
Will resend the series shortly.

-ck