5e15cfc3fa
the MNT_RDONLY flag if the "ro" option was passed in from userland, and clears it otherwise. In the diskless case, the MNT_RDONLY flag is already set when this code is reached, but there are no mount options, so it was incorrectly cleared. Change the logic so the MNT_RDONLY flag is set if the "ro" option was specified, and left alone otherwise. Note that the NFS code will still happily let you mount a filesystem RW even if the server exports it RO. I'm not sure how to fix that.
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