how do i read a block

[Sankar P]

On Mon, May 13, 2013 at 1:35 PM, shampavman <shampavman.cg at gmail.com> wrote:
> Hi all,
>
> Supposing i create a file of size 10K, it will occupy 2 blocks (4K each).
> Now if i want to read only 1 block from it how can i do it?
>

It will require 3 blocks.


> read(fd, buf, 4096) ;
> would this mean i would read the first block and all its contents?
>

It may be read even further (readahead)

If you are in kernel mode, and if you want to implement your own
filesystem and want to read a single block, you can use the sb_bread
function.


--
Sankar P
http://psankar.blogspot.com