linux-kernel - Re: API break, sysfs "capability" file

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Message-ID: <248d92b7-23b0-4c84-8c38-58d956b88a64@suse.de>
Date: Thu, 18 Apr 2024 08:28:01 +0200
From: Hannes Reinecke <hare@...e.de>
To: Christoph Hellwig <hch@....de>, Lennart Poettering <mzxreary@...inter.de>
Cc: Keith Busch <kbusch@...nel.org>,
 Linux regressions mailing list <regressions@...ts.linux.dev>,
 linux-block@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
 Jens Axboe <axboe@...nel.dk>
Subject: Re: API break, sysfs "capability" file

On 4/17/24 17:59, Christoph Hellwig wrote:
> On Wed, Apr 17, 2024 at 05:48:16PM +0200, Lennart Poettering wrote:
>> Block devices with part scanning off are quite common after all,
>> i.e. "losetup" creates them by default like that, and partition block
>> devices themselves have no part scanning on and so on, hence we have
>> to be ablet to operate sanely with them.
> 
> Maybe and ioctl to turn on partition scanning if it is currently disabled
> or return an error otherwise would be the better thing?  It would
> do the right thing for the most common loop case, and with a bit more
> work could do the right thing for those that more or less disable it
> graciously (ubiblock, drbd, zram) and would just fail for those who are
> so grotty old code and slow devices that we never want to do a partition
> scan (basically old floppy drivers and the Nintendo N64 cartridge driver)
> 
> 
The world is going to end.
hch suggests an ioctl.

Cheers,

Hannes
-- 
Dr. Hannes Reinecke                  Kernel Storage Architect
hare@...e.de                                +49 911 74053 688
SUSE Software Solutions GmbH, Frankenstr. 146, 90461 Nürnberg
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