> The two big features of btrfs are self-healing and online fsck, those have to 

Are they?

> be implemented in kernel space.

Why? There have been online fscks in user space in the past,
e.g. the various schemes using LVM snapshots for ext* and 
other related work on the BSD FFS. I don't see any principal
reason why it couldn't be done for btrfs either.

A good fsck is quite complex and you are unlikely to want all
that code in kernel space.

-Andi
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