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Convert ext4 to ext3


 
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Operating Systems Linux Red Hat Convert ext4 to ext3
# 1  
Old 03-29-2012
Convert ext4 to ext3

Is there any way to conver ext4 to ext3 filesystem without formatting the partition/disk ..

Had ext3 filesystem and had converted it to ext4 by issuing following command

Code:
# tune2fs -O extents,uninit_bg,dir_index /dev/sda1
# fsck -pf /dev/sda1
# blkid /dev/sda1
/dev/sda1: UUID="d90d719a-af91-41fd-a337-12d1d1b2aa82" TYPE="ext4"

Now I want to convert it back to ext3 but no luck !

--Shirish Shukla
# 2  
Old 03-29-2012
Unfortunately, it requires a lot of work on your part.

From a June 2007 article in Usenix Login; called Ext4: The Next Generation of the Ext3 File System. See https://www.usenix.org/publications/...me-32-number-3
Quote:
There is also a downgrade path from ext4 to ext3, with a method to convert the extent files back to indirect mapping files. In the case that users prefer to go back to ext3, they can mount the ext4 file system with the "noextents” mount option, copy the extent-based ext4 files to new files, rename these over the old extents, use tunefs to clear the INCOMPAT_EXTENTS flag, and then remount as an ext3 file system.

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