Re: post

[J Pradeep <pradeep@it.iitb.ac.in>]

Hi,
  Whenever there is a open on the device the operations corresponding to
your device are copied into the i-node at the VFS layer. Then any
subsequent requests are routed to your routines directly using the
requests. There is a open routine that you provide with your device that
gets called when there is a open on your device. You can do any
open-specific initializations here.

  I guess this will solve the problem.

-Pradeep


On Tue, 8 Jan 2002 mjoseph@hss.hns.com wrote:

> Subject:  doubt regarding :Waking up the request function for Block device
>       drivers??
> 
> ***************************************************************************
> ***************************************************************************
> ****
> 
> 
> I was going through the code in linux/drivers/block/ll_rw_blk.c
> and had a doubt which i though someone could answer
> 
> In a block device , The kernel maintains a global  list of requests in
> blk_dev[MAX_BLKDEV]. The request handlers are initalized for a
> particular device by
> q->request_fn           = rfn;
> 
> 
> My question is how does the Kernel signal ("wake up") the appropriate
> driver that
> "now you have a request that you need to service"
> 

-- 
-Pradeep
-----------------------------------
Let us be the change, we wish to see in this world.
                        --- Mahatma Gandhi
-----------------------------------
Pradeep Jagannath
pradeep@it.iitb.ernet.in
http://www.it.iitb.ernet.in/~pradeep

-----------------------------------

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