Improve lseek scalability

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Currently generic_file_llseek users synchronize all on the inode i_mutex,
which is very heavy handed because it affects even different processes.

This patchkit attempts to make generic_file_llseek (mostly) lockless.

For details see the individual patches.

This is a repost of the earlier version which got some reviews.

v2: Forward ported to recent kernel. Add SEEK_DATA/HOLE support.
Fix a nasty SEEK_END bug in the previous version.

-Andi

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