linux-kernel - Re: blk_validate_limits validation of block size (was Re: [PATCH v2] null

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Message-ID: <b7054e7b-9db1-46d4-ad19-8ced0eecf2e5@oracle.com>
Date: Wed, 3 Jul 2024 18:28:48 +0100
From: John Garry <john.g.garry@...cle.com>
To: Christoph Hellwig <hch@...radead.org>
Cc: Keith Busch <kbusch@...nel.org>, Jens Axboe <axboe@...nel.dk>,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: blk_validate_limits validation of block size (was Re: [PATCH v2]
 null_blk: fix validation of block size)

On 03/07/2024 14:19, Christoph Hellwig wrote:
> On Wed, Jul 03, 2024 at 01:20:26PM +0100, John Garry wrote:
>> So if we stop validating the limits in a., there is a user-visible change in
>> behaviour (as we stop rejecting invalid limits from the NBD_SET_BLKSIZE
>> ioctl).
>>
>> We could add a "dryrun" option to queue_limits_commit_update() (and call
>> that instead of blk_validate_block_size(), which is effectively the same as
>> calling blk_validate_block_size()). Or we can keep
>> nbd as the only blk_validate_limits() user (outside the block layer).
> I'd just keep the extra external blk_validate_block_size call in nbd.c.
> 
> Maybe add a comment to the blk_validate_block_size declaration that
> drivers should not bother with it as it's already done by
> blk_validate_limits.

ok, fine. It's a bit unfortunate that blk_validate_block_size() won't be 
internal to the block layer.