tree 5e2b9970b0144b91c5b8def73827aacca82845f4
parent eae83ce10b4713d9f4f3419af16436f89c1a7172
author Jens Axboe <axboe@kernel.dk> 1545408646 -0700
committer Jens Axboe <axboe@kernel.dk> 1551021617 -0700

block: add bio_set_polled() helper

For the upcoming async polled IO, we can't sleep allocating requests.
If we do, then we introduce a deadlock where the submitter already
has async polled IO in-flight, but can't wait for them to complete
since polled requests must be active found and reaped.

Utilize the helper in the blockdev DIRECT_IO code.

Reviewed-by: Hannes Reinecke <hare@suse.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>