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

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Message-ID: <yq1k4zw93vu.fsf@sermon.lab.mkp.net>
Date:	Fri, 18 Sep 2009 02:13:41 -0400
From:	"Martin K. Petersen" <martin.petersen@...cle.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

>>>>> "Eric" == Eric Sandeen <sandeen@...hat.com> writes:

Eric> This is just a rough cut, due to the blkid header selection issues
Eric> I mentioned earlier on the list.  It'll also need some config-fu
Eric> to be sure we've got a blkid which has these calls, but with it in
Eric> place, we'll finally have automatic selection of stride/stripe:

What about alignment?

I know that in our friendly DM universe the volume will be aligned.  But
what if the user does mkfs on /dev/sdX and the drive isn't naturally
aligned?

How flexible is the extN on-disk format?  Can you pad and shift things
if need be?

Also, are you guys affected by the previously-acked-sectors-are-now-gone
problems with 512-byte logical/4KB physical drives?

-- 
Martin K. Petersen	Oracle Linux Engineering
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