This seems to miss out on a lot of the generic functionality like
write_cache_pages and block_page_mkwrite and just patch it into
the ext4 copy & paste variants.  Please make sure your patches also
work for filesystem that use more of the generic functionality like
xfs or ext2 (the latter one might be fun for the mmap case).

Also what's the status of btrfs?  I remembered there was one or two
bits missing despite doing the right thing in most areas.

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