SMPTODO: remove timeout(9) from ffs_softdep.c

[Coleman Kane]

Hi all,

I was poking around SMPTODO for some work during an idle night, and I 
decided to fix the non-MPSAFE use of timeout(9) in ffs_softdep.c, and 
learn more about the callout_* API in the kernel. I'm attaching a patch 
of what I've done, which I am running in my current kernel at the moment 
(and I am using softupdates on a number of filesystems on this SMP machine).

Can anyone else try it out / review it / give feedback?

--
Coleman Kane

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