MFC r227272:
Add reference to gpart(8).
MFC r227280:
Initialize "acc" value inside the loop to reset failed attempts.
PR: misc/162262
MFC r227292:
Improve error reporting when MBR can not be written.
Remove obsolete code which uses DIOCSMBR ioctl.
When writing MBR first check that GEOM_MBR is available, if it is not
available, then try write MBR directly to provider. If both are failed,
then recommend to use gpart(8).
MFC r227295:
Fix multi-line comment formatting.
Pointed by: jh
Approved by: re (kib)
git-svn-id: svn://svn.freebsd.org/base/releng/9.0@227561
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