linux-ext4 - Re: errors following ext3 to ext4 conversion

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Date:	Thu, 27 Aug 2015 16:34:05 -0500
From:	Eric Sandeen <sandeen@...hat.com>
To:	"Theodore Ts'o" <tytso@....edu>,
	"Darrick J. Wong" <darrick.wong@...cle.com>
CC:	Chris Hunter <chris.hunter@...e.edu>, linux-ext4@...r.kernel.org
Subject: Re: errors following ext3 to ext4 conversion

On 8/27/15 1:58 PM, Theodore Ts'o wrote:
> I suspect that would fill Eric's heart with horror, but the ability to
> migrate the root file system from ext2 to ext3 while it was mounted
> (i.e., just run "tune2fs -O has_journal /dev/rootfs" and reboot) was
> something Stephen Tweedie added, so at least at one point Red Hat was
> more adventurous about what it would support in terms of file system
> upgrades without using mkfs.  :-)
> 
>     	     		       	       - Ted

Oh, it doesn't fill me with *that* much horror.  ;)

TBH, my big problem with the ext3->ext4 "migration" is that you wind
up with a mongrel filesystem which mkfs.ext4 would never create,
populated with files of varying runtime limitations and capabilities,
depending on whether they were created before or after the "migration."

Adding a journal and rebooting at least gets you to a pretty standard,
predictable, and tested result.  ;)

-Eric
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