fs: inode freeing and hash lookup via RCU

[Dave Chinner]

Hi Al,

The following three patches implement the extra functionality you
wanted on top of the inode lock breakup. The first patch lifts the
i_lock up out of writeback_single_inode(), the second implements RCU
freeing of inodes via SLAB_DESTROY_BY_RCU, and the third converts
inode hash lookup operations to use RCU list walks. Comments are
welcome.

Cheers,

Dave.
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