linux-kernel - Re: Getting HDD serial in kernel space

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Message-ID: <20091114152826.014cfc35@lxorguk.ukuu.org.uk>
Date:	Sat, 14 Nov 2009 15:28:26 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Andrey Polovov <andrey.polovov@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Getting HDD serial in kernel space

On Sat, 14 Nov 2009 14:34:54 +0300
Andrey Polovov <andrey.polovov@...il.com> wrote:

> Hello.
> 
> I had a necessity to get HDD serial number in my kernel module.
> In user space I can do it so:
> 
>     fd = open( "/dev/sda", O_RDONLY|O_NONBLOCK );
>     ioctl( fd, HDIO_GET_IDENTITY, &id );
>     printf( "Serial: %s", id.serial_no );
> 
> How can I do it in kernel space (it is one hdd in machine, plugged with
> SATA)?

The identity when probed is all in the struct ata_device, although be
aware that it may not be unique per device and also that hotplug means
you need to be careful how you access it. Now and then you meet a device
where the serial number changes randomly each boot just to really annoy.

What are you actually trying to do ?
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