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The new mount option "rro" makes the mount point recursively read-only, by calling `mount_setattr(2)` with `MOUNT_ATTR_RDONLY` and `AT_RECURSIVE`. https://man7.org/linux/man-pages/man2/mount_setattr.2.html Requires kernel >= 5.12. The "rro" option string conforms to the proposal in util-linux/util-linux Issue 1501. Fix issue 2823 Similary, this commit also adds the following mount options: - rrw - r[no]{suid,dev,exec,relatime,atime,strictatime,diratime,symfollow} Signed-off-by: Akihiro Suda <akihiro.suda.cz@hco.ntt.co.jp>