io_uring: support true async buffered reads, if file provides it

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If the file is flagged with FMODE_BUF_RASYNC, then we don't have to punt
the buffered read to an io-wq worker. Instead we can rely on page
unlocking callbacks to support retry based async IO. This is a lot more
efficient than doing async thread offload.

The retry is done similarly to how we handle poll based retry. From
the unlock callback, we simply queue the retry to a task_work based
handler.

Signed-off-by: Jens Axboe <axboe@kernel.dk>

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Jens Axboe 2020-05-22 09:24:42 -06:00

parent d1932dc3dc

commit bcf5a06304

1 changed files with 135 additions and 4 deletions

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fs/io_uring.c

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