linux-kernel - Re: [PATCH 0/20] return f

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Date:	Mon, 19 Jan 2009 20:39:09 -0600
From:	Dave Kleikamp <shaggy@...ux.vnet.ibm.com>
To:	Andreas Dilger <adilger@....com>
Cc:	coly.li@...e.de, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Roman Zippel <zippel@...ux-m68k.org>,
	"Sergey S. Kostyliov" <rathamahata@...4.ru>,
	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>,
	Mikulas Patocka <mikulas@...ax.karlin.mff.cuni.cz>,
	Bob Copeland <me@...copeland.com>,
	Anders Larsen <al@...rsen.net>, reiserfs-devel@...r.kernel.org,
	Phillip Lougher <phillip@...gher.demon.co.uk>,
	Christoph Hellwig <hch@...radead.org>,
	Evgeniy Dushistov <dushistov@...l.ru>, Jan Kara <jack@...e.cz>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>
Subject: Re: [PATCH 0/20] return f_fsid for statfs(2)

On Tue, 2009-01-20 at 07:36 +0800, Andreas Dilger wrote:
> On Jan 19, 2009  13:28 -0600, Dave Kleikamp wrote:
> > ext[234] return a portion of the uuid in f_fsid.  There is a theoretical
> > chance of those values being non-unique.  Since there doesn't appear to
> > be any case for the fsid to be persistent between boots, I guess
> > huge_encode_dev() is probably a better choice.  In practice it probably
> > makes no difference.
> 
> I'm not sure what you mean about "no case for fsid to be persistent"?
> The whole point of fsid (for NFS) is that this identifies the filesystem
> over reboot, even if the block device ID changes, or if the filesystem
> doesn't have a block device at all (e.g. cluster filesystem).

I guess that just demonstrates how little I know about what the fsid is
about.  Would it be preferable for file systems that have a uuid to use
that instead?  Of course anything is an improvement over zeroes.

Shaggy
-- 
David Kleikamp
IBM Linux Technology Center

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