io_uring: use non-intrusive list for defer

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The only left user of req->list is DRAIN, hence instead of keeping a
separate per request list for it, do that with old fashion non-intrusive
lists allocated on demand. That's a really slow path, so that's OK.

This removes req->list and so sheds 16 bytes from io_kiocb.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

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Pavel Begunkov 2020-07-13 23:37:14 +03:00 • committed by Jens Axboe

parent 7d6ddea6be

commit 27dc8338e5

1 changed files with 18 additions and 7 deletions

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fs/io_uring.c

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