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- Added the ext4 filesystem. Quick usage instructions: - Grab updated e2fsprogs from ftp://ftp.kernel.org/pub/linux/kernel/people/tytso/e2fsprogs-interim/ - It's still mke2fs -j /dev/hda1 - mount /dev/hda1 /wherever -t ext4dev - To enable extents, mount /dev/hda1 /wherever -t ext4dev -o extents - The filesystem is compatible with the ext3 driver until you add a file which has extents (ie: `mount -o extents', then create a file). - When comparing performance with other filesystems, remember that ext3/4 by default offers higher data integrity guarantees than most. So when comparing with a metadata-only journalling filesystem, use `mount -o data=writeback'. (Although this doesn't seem to make much difference with ext3). And you might as well use `mount -o nobh' too. Making the journal larger than the mke2fs default often helps performance with metadata-intensive workloads.