Switch mutex to using anonymous mmap
authorJens Axboe <jaxboe@fusionio.com>
Mon, 2 May 2011 16:10:56 +0000 (10:10 -0600)
committerJens Axboe <jaxboe@fusionio.com>
Mon, 2 May 2011 16:10:56 +0000 (10:10 -0600)
We don't need an fd backing for this, saves on file descriptors
in use.

Signed-off-by: Jens Axboe <jaxboe@fusionio.com>

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