linux-ext4 - Re: [PATCH] Add e4migrate

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Message-id: <20080905234426.GC3086@webber.adilger.int>
Date:	Fri, 05 Sep 2008 17:44:26 -0600
From:	Andreas Dilger <adilger@....com>
To:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
Cc:	tytso@....edu, linux-ext4@...r.kernel.org
Subject: Re: [PATCH] Add e4migrate

On Sep 05, 2008  15:41 +0530, Aneesh Kumar wrote:
> +e4migrate \- Migrate an ext3 inode to ext4 inode format
> +.B e4migrate will migrate filename in ext3 inode format to ext4 inode format
> +This can be used to migrate an ext3 file system to ext4 file system

Can you please explain a bit more about what is done here?  Is it changing
block mapped inodes to extent mapped?  Resising the inodes/GDT? Changing
other things like growing large inode space for ns timestamps/version?

We have an option to e2fsck (like -D for rehash directory, but instead
"-E expand_extra_isize") to resize the "extra_isize" of an existing inode
to ensure that enough space is in the filesystem for i_version_hi, if it
isn't already.  This is in our patch "e2fsprogs-expand-extra-isize.patch"
in the Lustre patchset.

I think it makes more sense to have options for existing tools, rather
than having 10 new different tools, but maybe Ted has other opinions.

Cheers, Andreas
--
Andreas Dilger
Sr. Staff Engineer, Lustre Group
Sun Microsystems of Canada, Inc.

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