Re: Writing onto disk sector

["Manish Katiyar" <mkatiyar@xxxxxxxxx>]

On Wed, Aug 20, 2008 at 1:21 PM, Akhil <akhilesh.noida@xxxxxxxxx> wrote:
> I am not sure whether this is a relevant question...please ignore if
> it seems nonsense....
>
> Is it possible in linux (2.6 or 2.4) to write/read directly onto a
> particular disk sector? If yes , how?

You mean raw read ???...from kernel ?? I am not sure if this is
correct ,but you can do something like this if you have the filesystem
over it.

sb=<superblock of filesystem>
struct buffer_head *bh = sb_bread(sb,blocknumber)

blocknumber would depend on which sector do you want to read and what
is the blocksize of the filesystem.......so rougly

blockno = (sector/(sb->s_blocksize/512));

The contents of your sector would be in bh->b_data .

Hope that helps........


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