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block: remove dead elevator code

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This removes a bunch of core and elevator related code. On the core
front, we remove anything related to queue running, draining,
initialization, plugging, and congestions. We also kill anything
related to request allocation, merging, retrieval, and completion.

Remove any checking for single queue IO schedulers, as they no
longer exist. This means we can also delete a bunch of code related
to request issue, adding, completion, etc - and all the SQ related
ops and helpers.

Also kill the load_default_modules(), as all that did was provide
for a way to load the default single queue elevator.

Tested-by: Ming Lei <[email protected]>
Reviewed-by: Omar Sandoval <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Jens Axboe 2018-10-29 10:23:51 -06:00
commit a1ce35fa49
17 changed files with 75 additions and 2440 deletions
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36
block/blk-settings.c
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@ -20,40 +20,6 @@ EXPORT_SYMBOL(blk_max_low_pfn);
unsigned long blk_max_pfn;
/**
* blk_queue_prep_rq - set a prepare_request function for queue
* @q: queue
* @pfn: prepare_request function
*
* It's possible for a queue to register a prepare_request callback which
* is invoked before the request is handed to the request_fn. The goal of
* the function is to prepare a request for I/O, it can be used to build a
* cdb from the request data for instance.
*
*/
void blk_queue_prep_rq(struct request_queue *q, prep_rq_fn *pfn)
{
q->prep_rq_fn = pfn;
}
EXPORT_SYMBOL(blk_queue_prep_rq);
/**
* blk_queue_unprep_rq - set an unprepare_request function for queue
* @q: queue
* @ufn: unprepare_request function
*
* It's possible for a queue to register an unprepare_request callback
* which is invoked before the request is finally completed. The goal
* of the function is to deallocate any data that was allocated in the
* prepare_request callback.
*
*/
void blk_queue_unprep_rq(struct request_queue *q, unprep_rq_fn *ufn)
{
q->unprep_rq_fn = ufn;
}
EXPORT_SYMBOL(blk_queue_unprep_rq);
void blk_queue_softirq_done(struct request_queue *q, softirq_done_fn *fn)
{
q->softirq_done_fn = fn;
@ -163,8 +129,6 @@ void blk_queue_make_request(struct request_queue *q, make_request_fn *mfn)
q->make_request_fn = mfn;
blk_queue_dma_alignment(q, 511);
blk_queue_congestion_threshold(q);
q->nr_batching = BLK_BATCH_REQ;
blk_set_default_limits(&q->limits);
}