Re: request_queue use-after-free - inode_detach_wb()

From	Tejun Heo <tj@kernel.org>
Newsgroups	linux.kernel
Subject	Re: request_queue use-after-free - inode_detach_wb()
Date	2015-11-18 17:00 +0100
Message-ID	<qwdjl-4US-21@gated-at.bofh.it> (permalink)
References	<qvz2y-3Mz-19@gated-at.bofh.it> <qvVw7-1Ai-21@gated-at.bofh.it> <qwcGC-4D5-15@gated-at.bofh.it> <qwcZY-4Lu-27@gated-at.bofh.it> <qwd9E-4Pa-27@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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Hello, Ilya.

On Wed, Nov 18, 2015 at 04:48:06PM +0100, Ilya Dryomov wrote:
> Just to be clear, the bdi/wb vs inode lifetime rules are that inodes
> should always be within bdi/wb?  There's been a lot of churn in this

Yes, that's where *I* think we should be headed.  Stuff in lower
layers should stick around while upper layer things are around.

> and related areas recently, including in block drivers: 6cd18e711dd8
> ("block: destroy bdi before blockdev is unregistered"), b02176f30cd3
> ("block: don't release bdi while request_queue has live references"),
> so I want to fully get my head around this.

End-of-life issue has always been a bit of mess in the block layer.
Thanks a lot for working on this.

-- 
tejun
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Thread

Re: request_queue use-after-free - inode_detach_wb() Tejun Heo <tj@kernel.org> - 2015-11-17 22:00 +0100
  Re: request_queue use-after-free - inode_detach_wb() Ilya Dryomov <idryomov@gmail.com> - 2015-11-18 16:20 +0100
    Re: request_queue use-after-free - inode_detach_wb() Tejun Heo <tj@kernel.org> - 2015-11-18 16:40 +0100
      Re: request_queue use-after-free - inode_detach_wb() Ilya Dryomov <idryomov@gmail.com> - 2015-11-18 16:50 +0100
        Re: request_queue use-after-free - inode_detach_wb() Tejun Heo <tj@kernel.org> - 2015-11-18 17:00 +0100
        Re: request_queue use-after-free - inode_detach_wb() Ilya Dryomov <idryomov@gmail.com> - 2015-11-19 22:00 +0100
          Re: request_queue use-after-free - inode_detach_wb() Tejun Heo <tj@kernel.org> - 2015-11-19 22:20 +0100
            Re: request_queue use-after-free - inode_detach_wb() Ilya Dryomov <idryomov@gmail.com> - 2015-11-19 23:00 +0100
              Re: request_queue use-after-free - inode_detach_wb() Tejun Heo <tj@kernel.org> - 2015-11-19 23:20 +0100

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