linux-kernel - Re: [PATCH -V14 0/11] Generic name to handle and open by handle syscalls

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Message-Id: <5DF5C974-092B-4CE6-B11D-2DBB73782149@dilger.ca>
Date:	Fri, 9 Jul 2010 12:42:42 -0600
From:	Andreas Dilger <adilger@...ger.ca>
To:	Neil Brown <neilb@...e.de>
Cc:	"Aneesh Kumar K. V" <aneesh.kumar@...ux.vnet.ibm.com>,
	"J. Bruce Fields" <bfields@...ldses.org>,
	Miklos Szeredi <miklos@...redi.hu>,
	Dave Chinner <david@...morbit.com>,
	Christoph Hellwig <hch@...radead.org>,
	"viro@...iv.linux.org.uk Viro" <viro@...iv.linux.org.uk>,
	"corbet@....net Corbet" <corbet@....net>,
	"hooanon05@...oo.co.jp Okajima" <hooanon05@...oo.co.jp>,
	linux-fsdevel@...r.kernel.org,
	"sfrench@...ibm.com French" <sfrench@...ibm.com>,
	"philippe.deniel@....FR Deniel" <philippe.deniel@....FR>,
	"linux-kernel@...r.kernel.org Mailinglist" 
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH -V14 0/11] Generic name to handle and open by handle syscalls

On 2010-07-08, at 06:21, Neil Brown wrote:
> On Thu, 08 Jul 2010 16:10:09 +0530
> "Aneesh Kumar K. V" <aneesh.kumar@...ux.vnet.ibm.com> wrote:
>> How about adding mnt_id to the handle ? Documentation file says it is unique 
>> 
>> (1) mount ID:  unique identifier of the mount (may be reused after umount)

But this value is not persistent across a reboot, or even an umount/mount so it is not useful as an identifier.

I suppose one way to resolve this issue is to just allow the underlying filesystem to supply a completely opaque filehandle to userspace.  For local filesystems that don't care about persistence or uniqueness between nodes they can use something like mount_id, and for distributed/clustered filesystems they can include a globally-unique identifier.

Cheers, Andreas





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