linux-kernel - Re: [RFC PATCH 0/2 v1] Ioctl for reading block queue information

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Message-ID: <alpine.LFD.2.00.1012101932440.2813@dhcp-lab-213.englab.brq.redhat.com>
Date:	Fri, 10 Dec 2010 19:38:21 +0100 (CET)
From:	Lukas Czerner <lczerner@...hat.com>
To:	Kay Sievers <kay.sievers@...y.org>
cc:	Lukas Czerner <lczerner@...hat.com>, Greg KH <gregkh@...e.de>,
	Andreas Dilger <adilger.kernel@...ger.ca>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	tytso@....edu, sandeen@...hat.com, hch@...radead.org,
	axboe@...nel.dk
Subject: Re: [RFC PATCH 0/2 v1] Ioctl for reading block queue information

On Fri, 10 Dec 2010, Kay Sievers wrote:

> On Fri, Dec 10, 2010 at 18:59, Lukas Czerner <lczerner@...hat.com> wrote:
> 
> > I do not really see how, reference manual is not exactly helpful with
> > this and I have got the impression that libudev functions are not able
> > to retrieve queue information, but rather device properties, basically
> > only from /sys/block/sda/* directory, not subdirectories.
> 
> Device subdirs are like attribute groups, the actual attribute just
> has a / in it.
> 
> Kay
> 

*hrm* it would _really_ use better documentation! I already tried what
you've described without any success using:

udev_device_get_property_value() <- no description at all!

however it does work with:

udev_device_get_sysattr_value ()

sysattr ? property ? tags ? this is all confusing and again, reference
manual is not documentation. But it works, so thanks!

-Lukas
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