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Date:	Thu, 31 Jan 2008 00:03:03 +0100
From:	supersud501 <supersud501@...oo.de>
To:	Theodore Tso <tytso@....edu>
CC:	linux-ext4@...r.kernel.org
Subject: Re: [PATCH, RFC] Add new "development flag" to the ext4 filesystem

Theodore Tso wrote:

> 
> You can manually set the flag using debugfs:
> 
>     # debugfs -w /dev/hdXX
>     debugfs: set_super_value s_flags 4
>     debugfs: quit
> 
> (Or, if you're lazy, you can also type the shorthand "ssv flags 4" to
> debugfs.)
> 
> With e2fsprogs 1.40.5, if the test_fs flag is set, then blkid will
> return a filesystem type ext4dev, such that if your mount is
> configured to use blkid (instead of vol_id), it will automatically use
> ext4dev to mount a filesystem that has (a) a journal (since ext4
> currently requires a journal), and (b) the test_fs flag set.
> 
> This makes it easier for people who are testing ext4, since they will
> just be able to do something like:
> 
>       # mke2fs -j -E test_fs /dev/mapper/lvmset-test
>       # mount /dev/mapper/lvmset-test
> 
> .. and /dev/mapper/lvmset-test will automatically be mounted using
> ext4.
> 
> 							 - Ted

thanks for your quick answer! i think i've learned something more about 
ext4 and those flags.
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