linux-kernel - Re: [GIT PULL] Detaching mounts on unlink for 3.15

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Date:	Thu, 17 Apr 2014 23:14:56 +0100
From:	Al Viro <viro@...IV.linux.org.uk>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	"Serge E. Hallyn" <serge@...lyn.com>,
	Linux-Fsdevel <linux-fsdevel@...r.kernel.org>,
	Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andy Lutomirski <luto@...capital.net>,
	Rob Landley <rob@...dley.net>,
	Miklos Szeredi <miklos@...redi.hu>,
	Christoph Hellwig <hch@...radead.org>,
	Karel Zak <kzak@...hat.com>,
	"J. Bruce Fields" <bfields@...ldses.org>,
	Fengguang Wu <fengguang.wu@...el.com>, tytso@....edu
Subject: Re: [GIT PULL] Detaching mounts on unlink for 3.15

On Thu, Apr 17, 2014 at 11:12:03PM +0100, Al Viro wrote:
> 	* *KERNEL* vfsmounts; anything without MNT_INTERNAL is fair game
> as far as ordering of fs shutdown is concerned.  If it wasn't MNT_INTERNAL,
> and we'd done mntput() before destroying some data structures needed for

s/before/just before/, of course ;-)

> fs shutdown, we had been fucked anyway - no warranties that mntput() had
> been the final one.  Moreover, that means going through kern_unmount() or
> simple_release_fs().  Which is trivially dealt with by providing
> mntput_sync(mnt) that *will* wait and using it in those two.  Again, if
> we have an extra reference (e.g. stuffed into a struct file, etc.) -
> we can't rely on mntput() being final.
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