I don't think it is udisks that is mounting the other filesystems read/only, but rather that those filesystems automatically fall back to read/only when they see the media is read-only. You should be able to see the errors in dmesg where the fs falls back to read-only mode.
I don't think it is udisks that is mounting the other filesystems read/only, but rather that those filesystems automatically fall back to read/only when they see the media is read-only. You should be able to see the errors in dmesg where the fs falls back to read-only mode.