[0/18] Implement some low hanging BKL removal fruit in fs/*

[Andrew: I believe this is -mm material for .25]

- Convert some more file systems (generally those who don't use the BKL
for anything except mount) to use unlocked_bkl.
- Implement BKL less fasync (see patch for the rationale) 
This is currently a separate entry point, but since the number of fasync
users in the tree is relatively small I hope the older entry point can
be removed then in the not too far future
[help from other people converting more fasync users to unlocked_fasync
would be appreciated]
- Implement BKL less remote_llseek
- While I was at it I also added a few missing compat ioctl handlers
- Fix a few comments

This fixes a lot of relatively trivial BKL users in fs/*. The main 
remaining non legacy offenders are now locks.c, nfs/nfsd and reiserfs.
I believe BKL removal for all of those is being worked on by other people.
Also a lot of "legacy" file systems still use it, but converting those
does not seem to be very pressing.

-Andi
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