linux-ext4 - Re: [PATCH, RFC] mke2fs: get device topology values from blkid

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Date:	Thu, 17 Sep 2009 23:55:47 -0600
From:	Andreas Dilger <adilger@....com>
To:	Eric Sandeen <sandeen@...hat.com>
Cc:	ext4 development <linux-ext4@...r.kernel.org>
Subject: Re: [PATCH, RFC] mke2fs: get device topology values from blkid

On Sep 17, 2009  17:22 -0500, Eric Sandeen wrote:
> This is just a rough cut, due to the blkid header selection
> issues I mentioned earlier on the list.  It'll also need
> some config-fu to be sure we've got a blkid which has these
> calls, but with it in place, we'll finally have automatic
> selection of stride/stripe:
> 
> # misc/mke2fs -b 4096 /dev/md0 
> mke2fs 1.41.9 (22-Aug-2009)
> Filesystem label=
> OS type: Linux
> Block size=4096 (log=2)
> Fragment size=4096 (log=2)
> Stride=16 blocks, Stripe width=32 blocks
> ...

Cool.

> Signed-off-by: Eric Sandeen <sandeen@...hat.com>
>  	printf(_("Fragment size=%u (log=%u)\n"), fs->fragsize,
>  		s->s_log_frag_size);
> +	printf(_("Stride=%u blocks, Stripe width=%u blocks\n"),
> +	       s->s_raid_stride, s->s_raid_stripe_width);

I was going to say we should only print these if non-zero, but for
Pete's sake we print the "Fragment size", which has never been useful,
so I don't see any harm in this.  Maybe "RAID Stride ..."?

> +static errcode_t ext2fs_get_device_geometry(const char *file,
> +					    struct ext2_super_block *fs_param)
> +{
> +	rc = blkid_probe_set_device(pr, fd, 0, 0);

Is this in the e2fsprogs blkid code yet?  I'm guessing not, since you
are getting build problems, which means anyone building with something
other than latest & greatest util-linux will also get failures.

Either this needs to be configured in, or you need to upgrade the
blkid included with e2fsprogs to handle this.

Cheers, Andreas
--
Andreas Dilger
Sr. Staff Engineer, Lustre Group
Sun Microsystems of Canada, Inc.

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