Re: Racy loop device reuse logic
From: Jan Kara <jack@suse.cz>
Date: 2022-01-19 21:34:24
On Wed 19-01-22 20:30:52, Tetsuo Handa wrote:
I found a way to avoid this race by splitting lo_open() into two phases using task_work_add(). Christoph Hellwig is trying to take a look at https://lkml.kernel.org/r/f6b947d0-1047-66b3-0243-af5017c9ab55@I-love.SAKURA.ne.jp .
No, you have found a way to make the race window for mount(8) smaller. And I still disagree with that kernel change because it is making kernel more complex only to make the race window smaller. On another machine or with different scheduling decisions, you can still hit this race. This problem must be fixed in mount... Honza -- Jan Kara [off-list ref] SUSE Labs, CR