[Bug 203303] ISSUE with md vnode device with size mismatch

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=203303

            Bug ID: 203303
           Summary: ISSUE with md vnode device with size mismatch
           Product: Base System
           Version: 10.2-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: roberfern at gmail.com

We create a 32M file using on a ufs filesystem:
dd if=/dev/random of=/tmp/test.file bs=32M count=1

Once a md device is created using the following command:
mdconfig -at vnode -f /tmp/test.file -s 64M

then, we try to execute the next command:

dd if=/dev/md0 of=cpy_test.file bs=16M

We get a file that is 64M long. We expected some error after 32M, but the
operation succeed.
The exceeding 32M of cpy_test.file is the last 16M of the original file
repeated twice.

More interesting, when we use newfs on the md0 device:
newfs /dev/md0

we get that the file "/tmp/test.file" under md0 becomes automatically 64M
large.

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