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block: remove ->poll_fn

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This was intended to support users like nvme multipath, but is just
getting in the way and adding another indirect call.

Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2018-12-02 17:46:26 +01:00 committed by Jens Axboe
parent 9d6610b76f
commit 529262d56d
3 changed files with 19 additions and 30 deletions
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23
block/blk-core.c
View File

@ -1250,29 +1250,6 @@ blk_qc_t submit_bio(struct bio *bio)
}
EXPORT_SYMBOL(submit_bio);
/**
* blk_poll - poll for IO completions
* @q: the queue
* @cookie: cookie passed back at IO submission time
* @spin: whether to spin for completions
*
* Description:
* Poll for completions on the passed in queue. Returns number of
* completed entries found. If @spin is true, then blk_poll will continue
* looping until at least one completion is found, unless the task is
* otherwise marked running (or we need to reschedule).
*/
int blk_poll(struct request_queue *q, blk_qc_t cookie, bool spin)
{
if (!q->poll_fn || !blk_qc_t_valid(cookie))
return 0;
if (current->plug)
blk_flush_plug_list(current->plug, false);
return q->poll_fn(q, cookie, spin);
}
EXPORT_SYMBOL_GPL(blk_poll);
/**
* blk_cloned_rq_check_limits - Helper function to check a cloned request
* for new the queue limits

24
block/blk-mq.c
View File

@ -38,7 +38,6 @@
#include "blk-mq-sched.h"
#include "blk-rq-qos.h"
static int blk_mq_poll(struct request_queue *q, blk_qc_t cookie, bool spin);
static void blk_mq_poll_stats_start(struct request_queue *q);
static void blk_mq_poll_stats_fn(struct blk_stat_callback *cb);
@ -2838,8 +2837,6 @@ struct request_queue *blk_mq_init_allocated_queue(struct blk_mq_tag_set *set,
spin_lock_init(&q->requeue_lock);
blk_queue_make_request(q, blk_mq_make_request);
if (q->mq_ops->poll)
q->poll_fn = blk_mq_poll;
/*
* Do this after blk_queue_make_request() overrides it...
@ -3400,14 +3397,30 @@ static bool blk_mq_poll_hybrid(struct request_queue *q,
return blk_mq_poll_hybrid_sleep(q, hctx, rq);
}
static int blk_mq_poll(struct request_queue *q, blk_qc_t cookie, bool spin)
/**
* blk_poll - poll for IO completions
* @q: the queue
* @cookie: cookie passed back at IO submission time
* @spin: whether to spin for completions
*
* Description:
* Poll for completions on the passed in queue. Returns number of
* completed entries found. If @spin is true, then blk_poll will continue
* looping until at least one completion is found, unless the task is
* otherwise marked running (or we need to reschedule).
*/
int blk_poll(struct request_queue *q, blk_qc_t cookie, bool spin)
{
struct blk_mq_hw_ctx *hctx;
long state;
if (!test_bit(QUEUE_FLAG_POLL, &q->queue_flags))
if (!blk_qc_t_valid(cookie) ||
!test_bit(QUEUE_FLAG_POLL, &q->queue_flags))
return 0;
if (current->plug)
blk_flush_plug_list(current->plug, false);
hctx = q->queue_hw_ctx[blk_qc_t_to_queue_num(cookie)];
/*
@ -3448,6 +3461,7 @@ static int blk_mq_poll(struct request_queue *q, blk_qc_t cookie, bool spin)
__set_current_state(TASK_RUNNING);
return 0;
}
EXPORT_SYMBOL_GPL(blk_poll);
unsigned int blk_mq_rq_cpu(struct request *rq)
{

2
include/linux/blkdev.h
View File

@ -283,7 +283,6 @@ static inline unsigned short req_get_ioprio(struct request *req)
struct blk_queue_ctx;
typedef blk_qc_t (make_request_fn) (struct request_queue *q, struct bio *bio);
typedef int (poll_q_fn) (struct request_queue *q, blk_qc_t, bool spin);
struct bio_vec;
typedef int (dma_drain_needed_fn)(struct request *);
@ -401,7 +400,6 @@ struct request_queue {
struct rq_qos *rq_qos;
make_request_fn *make_request_fn;
poll_q_fn *poll_fn;
dma_drain_needed_fn *dma_drain_needed;
const struct blk_mq_ops *mq_ops;