Btrfs is a new copy on write filesystem for Linux aimed at implementing advanced features while focusing on fault tolerance, repair and easy administration. Initially developed by Oracle, Btrfs is licensed under the GPL and open for contribution from anyone.

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What is btrfs? What advanced features does it have?

I heard that Kernel 2.6.35 will have btrfs and that Ubuntu 10.10 could have btrfs by default. What will be its features? Will I be able to migrate my data from my current ext4 partition?