Linux kernel API about sector count

Linux kernel API about sector count

[韩磊]

Can you tell me the API about the count of sector  in linux kernel?

which .h file and function?

Thank you!

Re: Linux kernel API about sector count

[Mihai Donțu]

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

Re: Linux kernel API about sector count

[韩磊]

Thank you! I need disk's total count of sector,not the sector size.

2013/11/11 Mihai Donțu <mihai.dontu@gmail.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

Re: Linux kernel API about sector count

[韩磊]

 I need a API in linux kernel about the disk's total count of
sector,not the sector size.
thank you!


2013/11/11 韩磊 <bonben1989@gmail.com>:
> Thank you! I need disk's total count of sector,not the sector size.
>
> 2013/11/11 Mihai Donțu <mihai.dontu@gmail.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

Re: Linux kernel API about sector count

[Davidlohr Bueso]

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@gmail.com>:
> > Thank you! I need disk's total count of sector,not the sector size.
> >
> > 2013/11/11 Mihai Donțu <mihai.dontu@gmail.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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