From mboxrd@z Thu Jan  1 00:00:00 1970
From: Christoph Hellwig <hch@infradead.org>
Subject: Re: [PATCH -V3] Generic name to handle and open by handle syscalls
Date: Mon, 26 Apr 2010 06:28:44 -0400
Message-ID: <20100426102844.GA24515@infradead.org>
References: <1271960133-16414-1-git-send-email-aneesh.kumar@linux.vnet.ibm.com> <DABA9B7F-548A-489D-ABED-689383E7E2DF@mit.edu> <F4F339E7-3C44-4DAB-9C89-5E665D3CDE24@sun.com> <20100424110812.40989988@notabene.brown> <20100426095658.GD23020@infradead.org> <20100426201633.0989254f@notabene.brown>
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Cc: Christoph Hellwig <hch@infradead.org>,
	Andreas Dilger <adilger@sun.com>, Theodore Tso <tytso@mit.edu>,
	"Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>,
	viro@zeniv.linux.org.uk, corbet@lwn.net,
	linux-fsdevel@vger.kernel.org, sfrench@us.ibm.com
To: Neil Brown <neilb@suse.de>
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On Mon, Apr 26, 2010 at 08:16:33PM +1000, Neil Brown wrote:
> uuids - as Ted as shown - are not necessarily unique (despite the name),
> so using them to perform a lookup will either be imperfect (not good for a
> kernel interface) or will impose extra uniqueness which would break current
> configurations.

UUID can easily be made unique.  XFS for example refuses to mount
filesystems with duplicate UUIDs.