Re: [Ext2-devel] [RFC 0/13] extents and 48bit ext3

[Jeff Garzik <jeff@garzik.org>]

Stephen C. Tweedie wrote:
> Hi,
>
> On Fri, 2006-06-09 at 17:49 -0400, Jeff Garzik wrote:
>
> > > > Consider a blkdev of size S1.  Using LVM we increase that value under 
> > > > the hood to size S2, where S2 > S1.  We perform an online resize from 
> > > > size S1 to S2.  The size and alignment of any new groups added will 
> > > > different from the non-resize case, where mke2fs was run directly on a 
> > > > blkdev of size S2.
> > > No, they won't.  We simply grow the last block group in the filesystem
> > > up to the size where we'd naturally add another block group anyway; and
> > > then, we add another block group exactly where it would have been on a
> > > fresh mkfs.
> > Yes but the inodes per group etc. would differ.
>
> No, we add the same number of inodes in the new groups that all the
> previous groups have.

Yes.  Re-read what I wrote.  To put it another way, "mkfs S1 + resize to 
S2" does not produce precisely the same layout as "mkfs S2".

	Jeff



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