Re: [PATCH v2] md: don't create mddev in md_open
From: Christoph Hellwig <hch@infradead.org>
Date: 2021-04-01 06:18:08
On Thu, Apr 01, 2021 at 09:34:56AM +0800, Zhao Heming wrote:
commit d3374825ce57 ("md: make devices disappear when they are no longer
needed.") introduced protection between mddev creating & removing. The
md_open shouldn't create mddev when all_mddevs list doesn't contain
mddev. With currently code logic, there will be very easy to trigger
soft lockup in non-preempt env.As mention below, please don't make this even more of a mess than it needs to. We can just pick the two patches doing this from the series I sent:
Attachments
- 0001-md-factor-out-a-mddev_find_locked-helper-from-mddev_.patch [text/plain] 1816 bytes · preview
- 0002-md-split-mddev_find.patch [text/plain] 6044 bytes · preview