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Converting Ext2 -> Ext3

Reading archives I did found letter related to my question:

Stephen C. Tweedie:
> On Fri, Jul 20, 2001 at 08:27:44PM +0300, Nikolaos Kefalas wrote:
>> I want only to  ask  ,  if it is necessary  to run tun2fs -J the kernel to have
>> support for ext3 .
>> I want to boot , from another  linux to convert my partions since the partition
>> must not be
>> mounted  but this does n't support ext3  :-(.
>No, you don't need any kernel support to run tune2fs.  You obviously
>need kernel support to mount the filesystem as ext3, but you can add
>the journal and keep mounting it as ext2 without any extra kernel

	Is it possible to convert ro fs?

	I just want to boot system with ro /, tune2fs -j /dev/hda, reboot, fix fstab
and reboot again.

	Is it possible? Why is this requirement - "no fs mounted" - here? Journal is
stored inside of fs structure?

	do I need to create boot floppy with tune2fs?

	Is there any option how to convert ext2 / to ext3?
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