ND> By taking this approach one step further you may just add a semaphore
ND> into struct dentry and take it instead of directory ->i_sem. I think
ND> Alexander Viro tried something similar in the past, but it slowed down
ND> common case when there is no concurrent access to the directory.
it's not semaphore. locks are created on demand to protect part of directory.
we can't have a lots of semaphores allocated statically for each part of
each directory.
BTW, all of this have to be enabled by 'pdirops' ext3's mount option. so, things
don't slow down w/o this option.
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