
While Ext4 was originally merged in 2.6.19, it was marked as a development filesystem. It has been a long time coming but as planned, Ext4dev has been
renamed to Ext4 in 2.6.28 to indicate its level of maturity and paving the way for production level deployments. Ext4 filesystem developer Ted Tso also endorsed Btrfs as a multi-vendor, next generation filesystem and along with the interest from Andrew Morton, Btrfs is planned to be merged before 2.6.29 is released. It will follow a similar development process to Ext4 and be initially marked as development only.
Member since:
2005-07-06
It'll be experimental. They want to merge it to increase its visibility and attract more developers.
In fact, the disk format is not predicted to be finalized until the end of the year, so if you use it before then, you'll end up with partitions that the next version of btrfs won't be able to mount.
After that it'll still not quite yet be considered stable and safe for anything more than data that you don't mind losing.