Getting HDD serial in kernel space

Getting HDD serial in kernel space

[Andrey Polovov]

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)?

Re: Getting HDD serial in kernel space

[Alan Cox]

On Sat, 14 Nov 2009 14:34:54 +0300
Andrey Polovov <andrey.polovov@gmail.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 ?

Re: Getting HDD serial in kernel space

[Andrey Polovov]

Andrey Polovov:

> How can I do it in kernel space (it is one hdd in machine, plugged with
> SATA)?

What I need is a small piece of code that can help me in getting a list
(ata_device array?) of plugged HDDs and their serial numbers.

Re: Getting HDD serial in kernel space

[Alan Cox]

On Sun, 15 Nov 2009 17:03:56 +0300
Andrey Polovov <andrey.polovov@gmail.com> wrote:

> Andrey Polovov:
> 
> > How can I do it in kernel space (it is one hdd in machine, plugged with
> > SATA)?
> 
> What I need is a small piece of code that can help me in getting a list
> (ata_device array?) of plugged HDDs and their serial numbers.

That wasn't the question I asked. The question I asked is "what are you
trying to do". You request seems rather odd, especially to try and do in
kernel space, so if we understood what you were trying to do it might
make more sense and easier to suggest the best way to approach it.

Alan