[Bug 214981] POLA violation: ZFS happily and silently remounts any existing mount on pool import

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=214981

            Bug ID: 214981
           Summary: POLA violation: ZFS happily and silently remounts any
                    existing mount on pool import
           Product: Base System
           Version: 11.0-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: vlad-fbsd at acheronmedia.com

When importing a pool with mountable datasets, they will always be mounted on
their mountpoints even if those points are already mounted elsewhere. This
includes even root (/).

Of course, unless you zpool import with, say, -R /mnt or -N.

However, the default is a huge violation of POLA, not to mention a huge
security issue. ZFS on Linux, btw, will not remount existing mounts, will error
out and complain.

I believe the defaults should be safe, non-destructive, non-astonishing, which
is not the case here.

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