linux-kernel - Re: [PATCH] loop: Increase bsize variable from unsigned short to unsigned int

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Message-ID: <CAEemH2djkWMtuTN2=Y5MXZVOACeCm32_Hh0zAJxH7X4Ss1MSuQ@mail.gmail.com>
Date: Tue, 27 Aug 2024 15:35:32 +0800
From: Li Wang <liwang@...hat.com>
To: John Garry <john.g.garry@...cle.com>
Cc: linux-kernel@...r.kernel.org, ltp@...ts.linux.it, 
	Jan Stancek <jstancek@...hat.com>, Damien Le Moal <dlemoal@...nel.org>, 
	Stefan Hajnoczi <stefanha@...hat.com>, linux-block@...r.kernel.org, axboe@...nel.dk
Subject: Re: [PATCH] loop: Increase bsize variable from unsigned short to
 unsigned int

On Tue, Aug 27, 2024 at 3:20 PM John Garry <john.g.garry@...cle.com> wrote:
>
> On 27/08/2024 04:22, Li Wang wrote:
>
> +linux-block, Jens
>
> > This change allows the loopback driver to handle larger block sizes
>
> larger than what? PAGE_SIZE?

Yes, system should return EINVAL when the tested bsize is larger than PAGE_SIZE.
But due to the loop_reconfigure_limits() cast it to 'unsined short' that
never gets an expected error when testing invalid logical block size.

That's why LTP/ioctl_loop06 failed on a system with 64k (ppc64le) pagesize
(since kernel-v6.11-rc1 with patches):

  9423c653fe6110 ("loop: Don't bother validating blocksize")
  fe3d508ba95bc6 ("block: Validate logical block size in blk_validate_limits()")



--
Regards,
Li Wang