linux-kernel - Re: [RFC PATCH] ubd: add io_uring based userspace block driver

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Message-ID: <87bkw6lgoo.fsf@collabora.com>
Date:   Mon, 09 May 2022 14:11:19 -0400
From:   Gabriel Krisman Bertazi <krisman@...labora.com>
To:     Randy Dunlap <rdunlap@...radead.org>
Cc:     Ming Lei <ming.lei@...hat.com>, Jens Axboe <axboe@...nel.dk>,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        io-uring@...r.kernel.org,
        ZiyangZhang <ZiyangZhang@...ux.alibaba.com>,
        Xiaoguang Wang <xiaoguang.wang@...ux.alibaba.com>
Subject: Re: [RFC PATCH] ubd: add io_uring based userspace block driver

Randy Dunlap <rdunlap@...radead.org> writes:

> On 5/9/22 02:23, Ming Lei wrote:
>> diff --git a/drivers/block/Kconfig b/drivers/block/Kconfig
>> index fdb81f2794cd..3893ccd82e8a 100644
>> --- a/drivers/block/Kconfig
>> +++ b/drivers/block/Kconfig
>> @@ -408,6 +408,13 @@ config BLK_DEV_RBD
>>  
>>  	  If unsure, say N.
>>  
>> +config BLK_DEV_USER_BLK_DRV
>> +	bool "Userspace block driver"
>> +	select IO_URING
>> +	default y
>
> Any "default y" driver is highly questionable and needs to be justified.
>
> Also: why is it bool instead of tristate?

I think it's only bool because it depends on task_work_add, which is not exported to
modules.  It is something to be fixed for sure, can that function just be exported?

-- 
Gabriel Krisman Bertazi