Re: [dm-devel] [PATCH] deadlock with suspend and quotas

[Al Viro <viro ZenIV linux org uk>]

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 redhat com>
> CC: stable kernel 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...