fs: peel back the inode_lock some more

Hi Al,

These as the first versions of the patches that remove the inode
lock from the writeback lists, superblock inode lists and the inode
hash table. I haven't polished them at all, but they appear to work
ok so I thought I'd send them out for comments before I went to bed...

With these patches the inode_lock pretty much disappears from my
lock_stat profiles, with the writeback list lock being the most
contended of the replacements on an 8-way machine.

Cheers,

Dave.
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