linux-ext4 - Re: [RFC][PATCH 1/11][take 2] add new mkfs option to create ext4 filesystems

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Date:	Mon, 25 Jun 2007 15:59:23 -0600
From:	Andreas Dilger <adilger@...sterfs.com>
To:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
Cc:	Valerie Clement <valerie.clement@...l.net>,
	Theodore Tso <tytso@....edu>,
	ext4 development <linux-ext4@...r.kernel.org>
Subject: Re: [RFC][PATCH 1/11][take 2] add new mkfs option to create ext4 filesystems

On Jun 25, 2007  20:24 +0530, Aneesh Kumar K.V wrote:
> Why would one need variable descriptor size. Right now we have only two 
> descriptor sizes right (32 and 64 ).  Can't we figure out
> the descriptor size we should use by looking at the partition size ? What 
> is that i am missing ?. 

Because one may want to expand an ext4 filesystem over 16TB after format
time, and this would require a 64-byte descriptor.  In ext4 the descriptor
is almost completely full already (to deal with BIG_BG changes, and possibly
large blocksize changes), so we may even need 128-byte descriptors soon.

Cheers, Andreas
--
Andreas Dilger
Principal Software Engineer
Cluster File Systems, Inc.

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