linux-ext4 - Re: [PATCH 3/8][e2fsprogs] add new -D <desc-size> option to mkfs

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Message-ID: <20070904062923.GZ5377@schatzie.adilger.int>
Date:	Tue, 4 Sep 2007 00:29:23 -0600
From:	Andreas Dilger <adilger@...sterfs.com>
To:	Mingming Cao <cmm@...ibm.com>
Cc:	Valerie Clement <valerie.clement@...l.net>,
	linux-ext4 <linux-ext4@...r.kernel.org>,
	Theodore Ts'o <tytso@....edu>
Subject: Re: [PATCH 3/8][e2fsprogs] add new -D <desc-size> option to mkfs

On Aug 31, 2007  17:25 -0700, Mingming Cao wrote:
> On Thu, 2007-08-30 at 14:51 -0600, Andreas Dilger wrote:
> > we will only have a single tool "mke2fs", and it should be able
> > to format filesystems for all kernels.
> 
> I agree. I was wondering why not make the 64bytes block group descriptor
> for ext4 as default. So by default we don't need to specify the size
> when creating ext4 fs.

Sure, this can be the default for ext4 (as with all the other ext4 features
like INCOMPAT_64BIT INCOMPAT_EXTENTS, UNINIT_GROUPS, etc).

> > Also, it may be desirable to make the descriptor larger for whatever
> > reason (e.g. testing some new feature).
> > 
> Okay, that could be useful for ext4. Don't feel ext2/3 needs that option.

It can't hurt anything.  At worst it means INCOMPAT_64BIT is enabled at
mke2fs time and the mount will immediately fail with ext2/ext3.  Users
shouldn't mess with options they don't understand.

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

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