[0/11] Repost of old VFS BKL patchkit

Since BKL removal seems to be en-vogue again here's the repost
of the unapplied parts of my older VFS BKL patchkit.

Main difference is port to 2.6.26-rc2  and more fasync conversins.

- Converts remote_llseek to be BKL less. This will either eliminate
or push it down in a couple of network file systems (SMBFS, CIFS, OCFS2, 
NCPFS, NFS)
- Converts file flags handling to i_mutex
[BTW while looking over the tree I think there are a few
races in this regard in there anyways. Not all people who modify
that take BKL. Auditing all of them is a separate project.
No difference before/after my patch]
- Adds unlocked_fasync
- Converts lots of fasync users to unlocked_fasync

-Andi