tree edd3c27ff43af17f22f8a52f507795f8966b5465
parent ef8eaa4e65facb1f51a64dbb4f5500134622c67c
author Pavel Begunkov <asml.silence@gmail.com> 1614424606 +0000
committer Jens Axboe <axboe@kernel.dk> 1614864982 -0700

io_uring: destroy io-wq on exec

Destroy current's io-wq backend and tctx on __io_uring_task_cancel(),
aka exec(). Looks it's not strictly necessary, because it will be done
at some point when the task dies and changes of creds/files/etc. are
handled, but better to do that earlier to free io-wq and not potentially
lock previous mm and other resources for the time being.

It's safe to do because we wait for all requests of the current task to
complete, so no request will use tctx afterwards. Note, that
io_uring_files_cancel() may leave some requests for later reaping, so it
leaves tctx intact, that's ok as the task is dying anyway.

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