Re: [GIT PULL] Ext3 removal, quota & udf fixes

From: Andreas Dilger
Date: Mon Aug 31 2015 - 20:23:12 EST

On Aug 31, 2015, at 3:37 PM, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> wrote:
> On Sun, Aug 30, 2015 at 11:19 PM, Jan Kara <jack@xxxxxxx> 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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