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io_uring: destroy io-wq on exec

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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>
This commit is contained in:
Pavel Begunkov
2021-02-27 11:16:46 +00:00
committed by Jens Axboe
parent ef8eaa4e65
commit 8452d4a674
2 changed files with 11 additions and 10 deletions
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2
include/linux/io_uring.h
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@@ -38,7 +38,7 @@ void __io_uring_free(struct task_struct *tsk);
static inline void io_uring_task_cancel(void)
{
if (current->io_uring && !xa_empty(&current->io_uring->xa))
if (current->io_uring)
__io_uring_task_cancel();
}
static inline void io_uring_files_cancel(struct files_struct *files)