Have a look at the output of # dmesg to see extra error messages and information.
Note also that FreeBSD only has read-only support for most of the Linux filesystems (XFS, ReiserFS, JFS, etc). There's only read-write support for ext2. The "read-only filesystem" error is mount telling you that you really should add -r to the mount command for these filesystems. It added this for you, output the error, then mounted the fs read-only.
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