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

From: Tejun Heo
Date: Wed Nov 18 2015 - 10:56:43 EST

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.

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