> Has the reason for this been identified? Judging from the nature of metadata
> loads, it would seem that it should be substantially easier to implement
> fsync() efficiently.

By design a copy on write tree fs would need to flush a whole
tree hierarchy on a sync. btrfs avoids this by using a special
log for fsync, but that causes more overhead if you have that
log on the same disk.  So IO subsystem will do more work.

It's a bit like JBD data journaling.

However it should not have the stalls inherent in ext3's journaling.

-Andi
-- 
a...@linux.intel.com -- Speaking for myself only.
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