Hi,
What kind of information are you looking for once you give /dev/hda as input?
There are two arrays called hardsect_size and blksize_size in the kernel that store information regarding a block device. hardsect_size[3][N] will give you the sector size of /dev/hdaN. blksize_size[m][n] gives you the blocksize for a block device with major number m and minor number n.
Hope this helps.
Regards,
Bijoy.
----- Original Message -----
From: Ahmed A <ahmedcali@xxxxxxxxx>
Date: Thursday, October 7, 2004 0:47 am
Subject: Re: Association between block device and block_device struct
>
> Hi,
>
> I was wondering if there is an alternate way than
> opening a file in kernel space. I am not sure if I
> can effectively open an device (the block device
> specifically) in kernel space.
>
> Is there a global array variable of all the block
> devices recognized by the kernel that I can scan to
> find out the the exact one for a corresponding dev
> entry (e.g /dev/hda). This is for 2.6 kernel.
>
> Regards,
> Ahmed.
>
> --- Vinod Sreedharan <vinod.sreedharan@xxxxxxxxxxxxxx>
> wrote:
>
> > Ahmed,
> >
> > inode->i_bdev will give you block_device for any
> > opened device file,
> > since during open file->dentry->inode association
> > has already been made.
> >
> > Thanks,
> > Vinod
> >
> > On Thu, 07 Oct 2004 Ahmed A wrote :
> > >Hello,
> > >
> > >I am trying to find the corresponding block_device
> > >struct for a certain block device (e.g. /dev/hda)
> > in
> > >2.6. Is there a way I can find the association.
> > >
> > >If not, can someone suggest some code, by which
> > give a
> > >block device name (e.g. hda), I can find out it's
> > >corresponding block_device struct. I was thinking
> > of
> > >one approach - "open" the block devive, get a file
> > >pointer back, and from that obtain the block_device
> > >pointer. Any code sample or pointers would be
> > highly
> > >appreciated.
> > >
> > >Regards,
> > >Ahmed.
> > >
> > >
> > >
> > >
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>
>
>
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