eventpoll: add EPOLL_URING_WAKE poll wakeup flag

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We can have dependencies between epoll and io_uring. Consider an epoll
context, identified by the epfd file descriptor, and an io_uring file
descriptor identified by iofd. If we add iofd to the epfd context, and
arm a multishot poll request for epfd with iofd, then the multishot
poll request will repeatedly trigger and generate events until terminated
by CQ ring overflow. This isn't a desired behavior.

Add EPOLL_URING so that io_uring can pass it in as part of the poll wakeup
key, and io_uring can check for that to detect a potential recursive
invocation.

Cc: stable@vger.kernel.org # 6.0
Signed-off-by: Jens Axboe <axboe@kernel.dk>

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This commit is contained in:

Jens Axboe 2022-11-20 10:10:53 -07:00

parent f9d567c75e

commit caf1aeaffc

2 changed files with 16 additions and 8 deletions

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18

fs/eventpoll.c

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6

include/uapi/linux/eventpoll.h

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