mai provato !


qui dice:

There is also a downgrade path from ext4 to ext3, with a method to con-
vert 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.


http://www.usenix.org/publications/l...dfs/mathur.pdf