linux-kernel - Re: [PATCH] UBIFS: fill f

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Message-ID: <20080901150147.GA20323@infradead.org>
Date:	Mon, 1 Sep 2008 11:01:47 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	David Woodhouse <dwmw2@...radead.org>
Cc:	Artem Bityutskiy <dedekind@...radead.org>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	Adrian Hunter <ext-adrian.hunter@...ia.com>
Subject: Re: [PATCH] UBIFS: fill f_fsid

On Mon, Sep 01, 2008 at 10:43:07AM +0100, David Woodhouse wrote:
> On Sun, 2008-08-31 at 17:52 +0300, Artem Bityutskiy wrote:
> > From: Artem Bityutskiy <Artem.Bityutskiy@...ia.com>
> > 
> > UBIFS stores 16-bit UUID in the superblock, and it is a good
> > idea to return part of it in 'f_fsid' filed of kstatfs structure.
> 
> I think you mean a 16-byte UUID, not 16-bit?
> 
> > +	memcpy(&buf->f_fsid, c->uuid, sizeof(__kernel_fsid_t));
> 
> For btrfs I xor the first 64 bits with the second 64 bits, and put
> _that_ into f_fsid. You're just putting the first 64 bits in and
> ignoring the second 64 bits. Neither is really _better_ than the other;
> you just alter the circumstances in which you get collisions. But I
> suppose we might as well be consistent about how we do it?

XFS just puts in the st_dev.  And I can't realy find any useful
defintion of what it's supposed to b anyway..

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