blk_add_request_payload - add a payload to a request
2. SYNOPSIS ▲
void blk_add_request_payload(struct request * rq , struct page * page , unsigned int len );
3. ARGUMENTS ▲
request to update
page backing the payload
length of the payload.
4. 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.
5. COPYRIGHT ▲