linux-kernel - Re: Linux kernel API about sector count

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Message-ID: <1384232059.25633.10.camel@buesod1.americas.hpqcorp.net>
Date:	Mon, 11 Nov 2013 20:54:19 -0800
From:	Davidlohr Bueso <davidlohr@...com>
To:	韩磊 <bonben1989@...il.com>
Cc:	Mihai Donțu <mihai.dontu@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Linux kernel API about sector count

On Tue, 2013-11-12 at 10:52 +0800, 韩磊 wrote:
>  I need a API in linux kernel about the disk's total count of
> sector,not the sector size.
> thank you!

Have you even tried searching through the code? Take a look at how fdisk
or blockdev or any other tool that deals with devices get the total
sectors, ie:

blockdev --getsize /dev/sda1

Then follow the path for such ioctl in the in the kernel source.

> 
> 
> 2013/11/11 韩磊 <bonben1989@...il.com>:
> > Thank you! I need disk's total count of sector,not the sector size.
> >
> > 2013/11/11 Mihai Donțu <mihai.dontu@...il.com>:
> >> On Mon, 11 Nov 2013 20:31:14 +0800 韩磊 wrote:
> >>> Can you tell me the API about the count of sector in linux kernel?
> >>>
> >>> which .h file and function?
> >>>
> >>
> >> Looking at fdisk (util-linux) there are several ioctls:
> >>  * HDIO_GETGEO  (linux/hdreg.h)
> >>  * BLKGETSIZE64 (linux/fs.h), sector size is assumed 512
> >>
> >> The HDIO interface *seems* to be legacy:
> >> http://www.mjmwired.net/kernel/Documentation/ioctl/hdio.txt
> >>
> >> Also see:
> >> https://git.kernel.org/cgit/utils/util-linux/util-linux.git/tree/fdisks/fdisk.c
> >>
> >> I hope this helps a bit.
> >>
> >> --
> >> Mihai Donțu
> --
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