tmpfs: convert from old swap vector to radix tree

Here's my third patchset for mmotm, completing the series.
Based on 3.0-rc3 plus the 14 in June 5th "mm: tmpfs and trunc changes"
plus the 7 in June 9th "tmpfs: simplify by splice instead of readpage",
which were in preparation for it.

I'm not sure who would really be interested in it: I'm Cc'ing this
header mail as notification to a number of people who might care;
but reluctant to spam you all with the 14+7+12 patches themselves,
I hope you can pick them up from the list if you want (or ask me).

What's it about?  Extending tmpfs to MAX_LFS_FILESIZE by abandoning
its peculiar swap vector, instead keeping a file's swap entries in
the same radix tree as its struct page pointers: thus saving memory,
and simplifying its code and locking.

 1/12 radix_tree: exceptional entries and indices
 2/12 mm: let swap use exceptional entries
 3/12 tmpfs: demolish old swap vector support
 4/12 tmpfs: miscellaneous trivial cleanups
 5/12 tmpfs: copy truncate_inode_pages_range
 6/12 tmpfs: convert shmem_truncate_range to radix-swap
 7/12 tmpfs: convert shmem_unuse_inode to radix-swap
 8/12 tmpfs: convert shmem_getpage_gfp to radix-swap
 9/12 tmpfs: convert mem_cgroup shmem to radix-swap
10/12 tmpfs: convert shmem_writepage and enable swap
11/12 tmpfs: use kmemdup for short symlinks
12/12 mm: a few small updates for radix-swap

 fs/stack.c                 |    5 
 include/linux/memcontrol.h |    8 
 include/linux/radix-tree.h |   36 
 include/linux/shmem_fs.h   |   17 
 include/linux/swapops.h    |   23 
 init/main.c                |    2 
 lib/radix-tree.c           |   29 
 mm/filemap.c               |   74 -
 mm/memcontrol.c            |   66 -
 mm/mincore.c               |   10 
 mm/shmem.c                 | 1515 +++++++++++------------------------
 mm/swapfile.c              |   20 
 mm/truncate.c              |    8 
 13 files changed, 669 insertions(+), 1144 deletions(-)

Hugh
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