[PATCH 0/2 v4] xfs_repair: improved secondary sb search

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Hello -

New iteration (v4) of this series...

Current xfs_repair uses a brute force approach to find a valid
secondary sb. This series optimizes the secondary sb search, using
similar method to determine geometry as that of xfs_mkfs. If the
faster method fails in its search, fall back to original brute force
slower search.

version history
----
v1: http://oss.sgi.com/archives/xfs/2016-02/msg00304.html
v2: patch 2 whitespace fixups
v3: patch 2 correct functionality; style fixups
v4: patch 1,2 properly see to style and whitespace fixups
----

patch 1 has some general infrastructure adjustments, moving general
topology functions from mkfs to libxcmd.

patch 2 adds the new secondary superblock search method.

Questions, comments are welcome.

Thanks-
Bill

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