An introduction to btrfs, from somebody who used to work on ZFS:

http://www.osnews.com/story/21920/A_Short_History_of_btrfs
*very* interesting article.. Not sure why James didn't directly link to
it, but courteous of Valerie Aurora (formerly Henson)

http://lwn.net/Articles/342892/

I'm trying to understand the argument against the SLAB allocator approach. If I understood correctly how BTRFS allocates space, changing and deleting files may just punch randomly sized holes into the disk layout. How's that better?

Regards,
-mg
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