linux-kernel - Re: [PATCH] deadlock with suspend and quotas

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Message-ID: <20120103033005.GZ23916@ZenIV.linux.org.uk>
Date:	Tue, 3 Jan 2012 03:30:05 +0000
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Mikulas Patocka <mpatocka@...hat.com>
Cc:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	Jan Kara <jack@...e.cz>, dm-devel@...hat.com
Subject: Re: [PATCH] deadlock with suspend and quotas

On Fri, Nov 25, 2011 at 03:25:16PM -0500, Mikulas Patocka wrote:

> The following patch fixes the deadlock. When the quota subsystem takes s_umount,
> it checks if the filesystem is frozen. If it is, we drop s_umount, wait for
> the filesystem to resume and retry.
> 
> Signed-off-by: Mikulas Patocka <mpatocka@...hat.com>
> CC: stable@...nel.org

So basically you want a variant of get_super() that would get you a
superblock for this bdev, locked and unfrozen?  Fair enough, but
	* that should be a proper helper in super.c, rather than
open-coded in fs/quota/quota.c, of all places
	* what about other existing callers get_super() and its friends?

and while we are at it, why in damnation name is it exported?  The only
caller outside of core VFS is under #if 0...
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