blk_add_request_payload man page on Scientific

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BLK_ADD_REQUEST_PAYL(9)		 Block Devices	       BLK_ADD_REQUEST_PAYL(9)

NAME
       blk_add_request_payload - add a payload to a request

SYNOPSIS
       void blk_add_request_payload(struct request * rq, struct page * page,
				    unsigned int len);

ARGUMENTS
       rq
	   request to update

       page
	   page backing the payload

       len
	   length of the payload.

DESCRIPTION
       This allows to later add a payload to an already submitted request by a
       block driver. The driver needs to take care of freeing the payload
       itself.

       Note that this is a quite horrible hack and nothing but handling of
       discard requests should ever use it.

COPYRIGHT
Kernel Hackers Manual 2.6.	 November 2013	       BLK_ADD_REQUEST_PAYL(9)
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