Instead of passing MNT_UPDATE, MNT_SNAPSHOT, MNT_RELOAD from userspace to kernel via nmount(), pass in the strings "update", "snapshot", "reload".
Instead of passing MNT_UPDATE, MNT_SNAPSHOT, MNT_RELOAD from
userspace to kernel via nmount(), pass in the strings
"update", "snapshot", "reload".

We want to move away from passing MNT_ flags from userspace -> kernel
via nmount(), and instead favor passing the string options.

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