c97833179036408e53ef5f3f5c7eaf781769bc
author Jens Axboe <jaxboe@fusionio.com> 1302595939 +0200
committer Jens Axboe <jaxboe@fusionio.com> 1302595939 +0200

block: fixup block IO unplug trace call

It was removed with the on-stack plugging, readd it and track the
depth of requests added when flushing the plug.

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