io_uring: shove more drain bits out of hot path

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Place all drain_next logic into io_drain_req(), so it's never executed
if there was no drained requests before. The only thing we need is to
set ->drain_active if we see a request with IOSQE_IO_DRAIN, do that in
io_init_req() where flags are definitely in registers.

Also, all drain-related code is encapsulated in io_drain_req(), makes it
cleaner.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/68bf4f7395ddaafbf1a26bd97b57d57d45a9f900.1623772051.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

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Pavel Begunkov 2021-06-15 16:47:57 +01:00 • committed by Jens Axboe

parent 10c669040e

commit 3c19966d37

1 changed files with 22 additions and 20 deletions

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fs/io_uring.c

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