Andreas Dilger wrote:
The other issue is that adding a new "ext4" filesystem type will cause
userspace tools to break that assume they know something about the
filesystem type. They will all detect the filesystem as "ext3" and try
to mount it as such, when the required kernel filesystem is ext4. Or
we will need to have "mkfs.ext4", "fsck.ext4", etc, for no particular
reason.
Yes, you want those tools, and you want to call the filesystem ext4.
Otherwise you'll never break free of the existing metadata formats
(which are apparently changing over time _anyway_).
Either a system upgrades totally to ext4 to avoid the duplication of code
in memory (and breaks ALL backward compatibility, for no good reason), or
Correct. You must upgrade totally to ext4.
And this happens ANYWAY once extents/etc. are enabled. Its an upgrade.
Jeff
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