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Cc: freebsd-questions@freebsd.org
Subject: Re: Mounting a read-only md FS as read-only
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> does mount_ext2fs support readonly at all?

The manpage implies that it does:

  The options are as follows:

  -o      Options are specified with a -o flag followed by a comma sepa-
          rated string of options.  See the mount(8) man page for possible
          options and their meanings.