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| author | Christoph Hellwig <hch@lst.de> | 2017-11-02 21:29:54 +0300 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2017-11-03 10:31:48 -0600 |
| commit | ea435e1b9392a33deceaea2a16ebaa3397bead93 (patch) | |
| tree | 73c80a2bfed2bc37cedc4d38d9534e231c61dbd8 /block/blk-core.c | |
| parent | 8ddcd653257c18a669fcb75ee42c37054908e0d6 (diff) | |
| download | lwn-ea435e1b9392a33deceaea2a16ebaa3397bead93.tar.gz lwn-ea435e1b9392a33deceaea2a16ebaa3397bead93.zip | |
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>
Diffstat (limited to 'block/blk-core.c')
| -rw-r--r-- | block/blk-core.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/block/blk-core.c b/block/blk-core.c index 68cfe6780a9b..395bfb10d658 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -2321,6 +2321,17 @@ 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 |