post

[mjoseph@hss.hns.com]

HI,
     I have been trying to post a query for a lifetime on the kernelnewbies
mailing list, But have failed so far.
Do you have a section on Kernelnewbies.org which is a lot less crypic abt
the procedure .

I have a query which I would like posted. I have sent it before to
kernelnewbies@nl.linux.org but it still isnt posted there, so I'll send it
across with this mail.



To:   kernelnewbies@nl.linux.org
cc:

Subject:  doubt regarding :Waking up the request function for Block device
      drivers??

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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"


Thanks in advance
 Mathew

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