[Bug 256796] gmultipath: fast-fail path-independent errors

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=256796

            Bug ID: 256796
           Summary: gmultipath: fast-fail path-independent errors
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: asomers@FreeBSD.org

Whenever an underlying provider returns an error, gmultipath will fail that
path and retry the command on another path, if any more remain.  So with n
total paths, every failing command will be tried up to n times.  But some
errors can't possibly be path-related.  For example, SCSI MEDIUM ERROR.  Those
failures should be passed up the stack with no retries.

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