xfs: seek_data/seek_hole refinements

Hello,

Here is the updated patch set for improving SEEK_DATA/SEEK_HOLE with page cache probing for unwritten extents, it fixes a couple of issues according to Dave and Mark's review comments towards v6.

Changes from v7 to v6:

- xfs_lookup_buffer_offset(), remove page unlock out of it, fix comments for this routine.

- xfs_find_get_pgoff(), sample the next page index while the page is locked.

- xfs_seek_data()/xfs_seek_hole(), move extent state check up stuff to a loop in both routines.

Old version:

Version 6 of this posting can be found at
http://oss.sgi.com/archives/xfs/2012-08/msg00028.html

Version 5 of this posting can be found at
http://www.spinics.net/lists/xfs/msg12987.html

Version 4 of this posting can be found at
http://oss.sgi.com/archives/xfs/2012-07/msg00279.html

Version 3 of this posting can be found at
http://oss.sgi.com/archives/xfs/2012-07/msg00050.html

Version 2 of this posting can be found at
http://oss.sgi.com/archives/xfs/2012-06/msg00407.html

Version 1 of this posting can be found at
http://www.digipedia.pl/usenet/thread/11980/26875/

Thanks,
-Jeff

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