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Date:	Mon, 31 Aug 2015 18:23:01 -0600
From:	Andreas Dilger <adilger@...ger.ca>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Jan Kara <jack@...e.cz>, LKML <linux-kernel@...r.kernel.org>,
	"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>
Subject: Re: [GIT PULL] Ext3 removal, quota & udf fixes

On Aug 31, 2015, at 3:37 PM, Linus Torvalds <torvalds@...ux-foundation.org> wrote:
> 
> On Sun, Aug 30, 2015 at 11:19 PM, Jan Kara <jack@...e.cz> wrote:
>> 
>> The biggest change in the pull is the removal of ext3 filesystem driver
>> (~28k lines removed).
> 
> I really am not ready to just remove ext3 without a lot of good
> arguments. There might well be people who this use ext3 as ext3, and
> don't want to update. I want more a rationale for removal than "ext4
> can read old ext3 filesystems".

The ext4 code can read and write ext3 filesystems without any
compatibility issues (i.e. none of the ext4-specific features are
enabled automatically) and have been doing so for all RHEL and SLES
users for the past several years via the CONFIG_EXT4_USE_FOR_EXT23
option (added in commit 24b58424 in 2009).  It looks like the same
for Ubuntu since early 2014 also.

The ext4-specific features either need to be enabled specifically
via tune2fs (if possible) or at mkfs time.

Cheers, Andreas





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