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block: add a poll_fn callback to struct request_queue 

That we we can also poll non blk-mq queues.  Mostly needed for
the NVMe multipath code, but could also be useful elsewhere.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
(cherry picked from commit ea435e1b93)
pull/10/head
Christoph Hellwig 2017-11-02 21:29:54 +03:00 committed by Jason Liu
parent 77e24f9e13
commit 45cde2f816
8 changed files with 25 additions and 16 deletions
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11
block/blk-core.c
View File

@ -2338,6 +2338,17 @@ blk_qc_t submit_bio(struct bio *bio)
}
EXPORT_SYMBOL(submit_bio);
bool blk_poll(struct request_queue *q, blk_qc_t cookie)
{
if (!q->poll_fn || !blk_qc_t_valid(cookie))
return false;
if (current->plug)
blk_flush_plug_list(current->plug, false);
return q->poll_fn(q, cookie);
}
EXPORT_SYMBOL_GPL(blk_poll);
/**
* blk_cloned_rq_check_limits - Helper function to check a cloned request
* for new the queue limits

14
block/blk-mq.c
View File

@ -37,6 +37,7 @@
#include "blk-wbt.h"
#include "blk-mq-sched.h"
static bool blk_mq_poll(struct request_queue *q, blk_qc_t cookie);
static void blk_mq_poll_stats_start(struct request_queue *q);
static void blk_mq_poll_stats_fn(struct blk_stat_callback *cb);
@ -2449,6 +2450,8 @@ 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...
@ -2926,20 +2929,14 @@ static bool __blk_mq_poll(struct blk_mq_hw_ctx *hctx, struct request *rq)
return false;
}
bool blk_mq_poll(struct request_queue *q, blk_qc_t cookie)
static bool blk_mq_poll(struct request_queue *q, blk_qc_t cookie)
{
struct blk_mq_hw_ctx *hctx;
struct blk_plug *plug;
struct request *rq;
if (!q->mq_ops || !q->mq_ops->poll || !blk_qc_t_valid(cookie) ||
!test_bit(QUEUE_FLAG_POLL, &q->queue_flags))
if (!test_bit(QUEUE_FLAG_POLL, &q->queue_flags))
return false;
plug = current->plug;
if (plug)
blk_flush_plug_list(plug, false);
hctx = q->queue_hw_ctx[blk_qc_t_to_queue_num(cookie)];
if (!blk_qc_t_is_internal(cookie))
rq = blk_mq_tag_to_rq(hctx->tags, blk_qc_t_to_tag(cookie));
@ -2957,7 +2954,6 @@ bool blk_mq_poll(struct request_queue *q, blk_qc_t cookie)
return __blk_mq_poll(hctx, rq);
}
EXPORT_SYMBOL_GPL(blk_mq_poll);
static int __init blk_mq_init(void)
{

2
drivers/nvme/target/io-cmd.c
View File

@ -94,7 +94,7 @@ static void nvmet_execute_rw(struct nvmet_req *req)
cookie = submit_bio(bio);
blk_mq_poll(bdev_get_queue(req->ns->bdev), cookie);
blk_poll(bdev_get_queue(req->ns->bdev), cookie);
}
static void nvmet_execute_flush(struct nvmet_req *req)

4
fs/block_dev.c
View File

@ -249,7 +249,7 @@ __blkdev_direct_IO_simple(struct kiocb *iocb, struct iov_iter *iter,
if (!READ_ONCE(bio.bi_private))
break;
if (!(iocb->ki_flags & IOCB_HIPRI) ||
!blk_mq_poll(bdev_get_queue(bdev), qc))
!blk_poll(bdev_get_queue(bdev), qc))
io_schedule();
}
__set_current_state(TASK_RUNNING);
@ -415,7 +415,7 @@ __blkdev_direct_IO(struct kiocb *iocb, struct iov_iter *iter, int nr_pages)
break;
if (!(iocb->ki_flags & IOCB_HIPRI) ||
!blk_mq_poll(bdev_get_queue(bdev), qc))
!blk_poll(bdev_get_queue(bdev), qc))
io_schedule();
}
__set_current_state(TASK_RUNNING);

2
fs/direct-io.c
View File

@ -497,7 +497,7 @@ static struct bio *dio_await_one(struct dio *dio)
dio->waiter = current;
spin_unlock_irqrestore(&dio->bio_lock, flags);
if (!(dio->iocb->ki_flags & IOCB_HIPRI) ||
!blk_mq_poll(dio->bio_disk->queue, dio->bio_cookie))
!blk_poll(dio->bio_disk->queue, dio->bio_cookie))
io_schedule();
/* wake up sets us TASK_RUNNING */
spin_lock_irqsave(&dio->bio_lock, flags);

2
fs/iomap.c
View File

@ -1057,7 +1057,7 @@ iomap_dio_rw(struct kiocb *iocb, struct iov_iter *iter,
if (!(iocb->ki_flags & IOCB_HIPRI) ||
!dio->submit.last_queue ||
!blk_mq_poll(dio->submit.last_queue,
!blk_poll(dio->submit.last_queue,
dio->submit.cookie))
io_schedule();
}

4
include/linux/blkdev.h
View File

@ -284,6 +284,7 @@ struct blk_queue_ctx;
typedef void (request_fn_proc) (struct request_queue *q);
typedef blk_qc_t (make_request_fn) (struct request_queue *q, struct bio *bio);
typedef bool (poll_q_fn) (struct request_queue *q, blk_qc_t);
typedef int (prep_rq_fn) (struct request_queue *, struct request *);
typedef void (unprep_rq_fn) (struct request_queue *, struct request *);
@ -426,6 +427,7 @@ struct request_queue {
request_fn_proc *request_fn;
make_request_fn *make_request_fn;
poll_q_fn *poll_fn;
prep_rq_fn *prep_rq_fn;
unprep_rq_fn *unprep_rq_fn;
softirq_done_fn *softirq_done_fn;
@ -1009,7 +1011,7 @@ extern void blk_execute_rq_nowait(struct request_queue *, struct gendisk *,
int blk_status_to_errno(blk_status_t status);
blk_status_t errno_to_blk_status(int errno);
bool blk_mq_poll(struct request_queue *q, blk_qc_t cookie);
bool blk_poll(struct request_queue *q, blk_qc_t cookie);
static inline struct request_queue *bdev_get_queue(struct block_device *bdev)
{

2
mm/page_io.c
View File

@ -408,7 +408,7 @@ int swap_readpage(struct page *page, bool do_poll)
if (!READ_ONCE(bio->bi_private))
break;
if (!blk_mq_poll(disk->queue, qc))
if (!blk_poll(disk->queue, qc))
break;
}
__set_current_state(TASK_RUNNING);