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

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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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