[patch 0/7] fault vs truncate/invalidate race fix

The following set of patches fix the fault vs invalidate and fault
vs truncate_range race for filemap_nopage mappings, plus those and
fault vs truncate race for nonlinear mappings.

Hasn't changed since I last submitted it, when it was rejected because
it made one of the buffered write deadlocks easier to hit. I'll try
again.

Patches based on 2.6.20-rc4. Comments?

Thanks,
Nick

--
SuSE Labs

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Follow-Ups:
- [patch 7/7] mm: remove legacy cruft
  - From: Nick Piggin <[email protected]>
- [patch 4/7] mm: merge populate and nopage into fault (fixes nonlinear)
  - From: Nick Piggin <[email protected]>
- [patch 5/7] mm: add vm_insert_pfn
  - From: Nick Piggin <[email protected]>
- [patch 6/7] mm: merge nopfn into fault
  - From: Nick Piggin <[email protected]>
- [patch 3/7] mm: fix fault vs invalidate race for linear mappings
  - From: Nick Piggin <[email protected]>
- [patch 1/7] mm: debug check for the fault vs invalidate race
  - From: Nick Piggin <[email protected]>
- [patch 2/7] mm: simplify filemap_nopage
  - From: Nick Piggin <[email protected]>

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