blk_queue_end_tag (9) - Linux Manuals
blk_queue_end_tag: end tag operations for a request
blk_queue_end_tag - end tag operations for a request
void blk_queue_end_tag(struct request_queue
* q, struct request * rq);
- the request queue for the device
- the request that has completed
Typically called when end_that_request_first returns 0, meaning all transfers have been done for a request. It's important to call this function before end_that_request_last, as that will put the request back on the free list thus corrupting the internal tag list.