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, int offset,
                                    unsigned int len);

ARGUMENTS
       rq
           request to update

       page
           page backing the payload

       offset
           offset in page

       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 4.8.                 January 2017                   BLK_ADD_REQUEST_PAYL(9)