linux-kernel - Re: [PATCH] loop: add some basic read-only sysfs attributes

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Date:	Thu, 29 Jul 2010 16:06:01 +0200
From:	Milan Broz <mbroz@...hat.com>
To:	Kay Sievers <kay.sievers@...y.org>
CC:	util-linux-ng@...r.kernel.org, linux-kernel@...r.kernel.org,
	kzak@...hat.com, axboe@...nel.dk
Subject: Re: [PATCH] loop: add some basic read-only sysfs attributes

On 07/29/2010 03:47 PM, Kay Sievers wrote:
> On Thu, Jul 29, 2010 at 15:33, Milan Broz <mbroz@...hat.com> wrote:
>> Create /sys/block/loopX/loop directory and provide these attributes:
>>  - backing_file
>>  - autoclear
>>  - offset
>>  - sizelimit
>>
>> To be used in util-linux-ng (and possibly elsewhere like udev rules)
>> where code need to get loop attributes from kernel (and not store
>> duplicate info in userspace).
> 
> Isn't it that the loop attributes are created _after_ the loopdev is
> registered? That would make it hard to use these attributes from udev,
> as the event is already running while they are created.

First 8 loop devices are registered always (without backing file),
so you have wait for change event initiated from fd set ioctl anyway...
(backing file attribute is empty in that case)

Milan
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