idea about internal fragmentation in Btrfs

[Zhihui Zhang]

I wish Btrfs well, so I would venture an idea for this specific case
mentioned by Edward Shishkin today.

Everyone knows that B-tree has internal and leaf nodes.  Can we make
the root as the leaf?  In other words, if you
create a 2K file, the B-tree will have only one node, which is both
the root and the leaf. Of course, you need some flag to
say this is a "degenerated" form of B-tree. Please cc me if you want
my response.

thanks,

-Zhihui
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