From: Al Viro <viro@zeniv.linux.org.uk>
To: Jens Axboe <axboe@kernel.dk>
Cc: Pavel Begunkov <asml.silence@gmail.com>,
io-uring@vger.kernel.org, linux-fsdevel@vger.kernel.org,
Linus Torvalds <torvalds@linux-foundation.org>
Subject: Re: [PATCH 3/3] io_uring: refactor io_sq_offload_create()
Date: Fri, 23 Jul 2021 00:10:32 +0000 [thread overview]
Message-ID: <YPoI+GYrgZgWN/dW@zeniv-ca.linux.org.uk> (raw)
In-Reply-To: <a85df247-137f-721c-6056-a5c340eed90e@kernel.dk>
On Thu, Jul 22, 2021 at 05:42:55PM -0600, Jens Axboe wrote:
> > So how can we possibly get there with tsk->files == NULL and what does it
> > have to do with files, anyway?
>
> It's not the clearest, but the files check is just to distinguish between
> exec vs normal cancel. For exec, we pass in files == NULL. It's not
> related to task->files being NULL or not, we explicitly pass NULL for
> exec.
Er... So turn that argument into bool cancel_all, and pass false on exit and
true on exit? While we are at it, what happens if you pass io_uring descriptor
to another process, close yours and then have the recepient close the one it
has gotten? AFAICS, io_ring_ctx_wait_and_kill(ctx) will be called in context
of a process that has never done anything io_uring-related. Can it end up
trying to resubmit some requests?
I rather hope it can't happen, but I don't see what would prevent it...
next prev parent reply other threads:[~2021-07-23 0:10 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-20 11:03 [PATCH 0/3] small 5.13 cleanups Pavel Begunkov
2021-04-20 11:03 ` [PATCH 1/3] io_uring: move inflight un-tracking into cleanup Pavel Begunkov
2021-04-20 11:03 ` [PATCH 2/3] io_uring: safer sq_creds putting Pavel Begunkov
2021-04-20 11:03 ` [PATCH 3/3] io_uring: refactor io_sq_offload_create() Pavel Begunkov
2021-07-22 21:59 ` Al Viro
2021-07-22 23:06 ` Jens Axboe
2021-07-22 23:30 ` Al Viro
2021-07-22 23:42 ` Jens Axboe
2021-07-23 0:10 ` Al Viro [this message]
2021-07-23 0:12 ` Al Viro
2021-07-23 16:17 ` Jens Axboe
2021-07-23 17:11 ` Al Viro
2021-07-23 17:32 ` Jens Axboe
2021-07-23 17:36 ` Jens Axboe
2021-07-23 17:56 ` Jens Axboe
2021-07-23 19:00 ` Al Viro
2021-07-23 20:10 ` Jens Axboe
2021-07-23 20:24 ` Al Viro
2021-07-23 22:32 ` Jens Axboe
2021-07-23 20:19 ` Al Viro
2021-07-23 23:45 ` Matthew Wilcox
2021-07-23 23:57 ` Jens Axboe
2021-07-24 1:31 ` Al Viro
2021-07-23 0:03 ` Al Viro
2021-07-23 9:59 ` Pavel Begunkov
2021-04-20 18:55 ` [PATCH 0/3] small 5.13 cleanups Jens Axboe
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