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Date: Wed, 12 Feb 2020 12:35:04 -0800
From: Linus Torvalds <>
To: Al Viro <>
Cc: "Eric W. Biederman" <>, LKML <>, 
	Kernel Hardening <>, Linux API <>, 
	Linux FS Devel <>, 
	Linux Security Module <>, 
	Akinobu Mita <>, Alexey Dobriyan <>, 
	Andrew Morton <>, Andy Lutomirski <>, 
	Daniel Micay <>, Djalal Harouni <>, 
	"Dmitry V . Levin" <>, Greg Kroah-Hartman <>, 
	Ingo Molnar <>, "J . Bruce Fields" <>, 
	Jeff Layton <>, Jonathan Corbet <>, 
	Kees Cook <>, Oleg Nesterov <>, 
	Solar Designer <>
Subject: Re: [PATCH v8 07/11] proc: flush task dcache entries from all procfs instances

On Wed, Feb 12, 2020 at 12:03 PM Al Viro <> wrote:
> What's to prevent racing with fs shutdown while you are doing the second part?

I was thinking that only the proc_flush_task() code would do this.

And that holds a ref to the vfsmount through upid->ns.

So I wasn't suggesting doing this in general - just splitting up the
implementation of d_invalidate() so that proc_flush_task_mnt() could
delay the complex part to after having traversed the RCU-protected

But hey - I missed this part of the problem originally, so maybe I'm
just missing something else this time. Wouldn't be the first time.


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