NAME
blk_execute_rq - insert a request into queue for execution
SYNOPSIS
int blk_execute_rq (request_queue_t * q, struct gendisk * bd_disk,
struct request * rq, int at_head);
ARGUMENTS
q queue to insert the request in
bd_disk
matching gendisk
rq request to insert
at_head
insert request at head or tail of queue
DESCRIPTION
Insert a fully prepared request at the back of the io scheduler queue
for execution and wait for completion.