linux-kernel - Re: [PATCH V2 0/3] block: avoid to drop & re-add partitions if partitions aren't changed

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Date:   Wed, 24 Feb 2021 19:23:54 +0800
From:   Ming Lei <ming.lei@...hat.com>
To:     Christoph Hellwig <hch@....de>
Cc:     Jens Axboe <axboe@...nel.dk>, linux-block@...r.kernel.org,
        "Ewan D . Milne" <emilne@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V2 0/3] block: avoid to drop & re-add partitions if
 partitions aren't changed

On Wed, Feb 24, 2021 at 09:18:25AM +0100, Christoph Hellwig wrote:
> On Wed, Feb 24, 2021 at 11:58:26AM +0800, Ming Lei wrote:
> > Hi Guys,
> > 
> > The two patches changes block ioctl(BLKRRPART) for avoiding drop &
> > re-add partitions if partitions state isn't changed. The current
> > behavior confuses userspace because partitions can disappear anytime
> > when calling into ioctl(BLKRRPART).
> 
> Which is the f***king point of BLKRRPART and the behavior it had
> since day 1.  Please fix the application(s) that all it all the time
> instead of bloating the kernel, as said before.
> 

ioctl(BLKRRPART) can be called without changing partition table in
fdisk, cfdisk, sfdisk, systemd and blockdev at least, and it isn't only
on one single application. Even for blockdev, not sure if it can be fixed
because '--rereadpt' is simply one subcommand.

-- 
Ming