io_uring: allow POLL_ADD with double poll_wait() users

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Some file descriptors use separate waitqueues for their f_ops->poll()
handler, most commonly one for read and one for write. The io_uring
poll implementation doesn't work with that, as the 2nd poll_wait()
call will cause the io_uring poll request to -EINVAL.

This affects (at least) tty devices and /dev/random as well. This is a
big problem for event loops where some file descriptors work, and others
don't.

With this fix, io_uring handles multiple waitqueues.

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

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This commit is contained in:

Jens Axboe 2020-05-15 11:56:54 -06:00

parent 4a38aed2a0

commit 18bceab101

1 changed files with 146 additions and 72 deletions

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fs/io_uring.c

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