UNIT_DEPENDENCY_MOUNTINFO_OR_FILE was a bit strange as unlike the other flags we don't know where the dependency came from exactly. Indeed its origin could have been from the mount unit file or from /proc/self/mountinfo. Instead this patch replaces UNIT_DEPENDENCY_MOUNTINFO_OR_FILE with 2 new dependency flags: UNIT_DEPENDENCY_MOUNT_FILE and UNIT_DEPENDENCY_MOUNTINFO. The former indicates that the dep is created from the unit file but unlike UNIT_DEPENDENCY_FILE, it will be replaced by a dep with the UNIT_DEPENDENCY_MOUNTINFO flag as soon as the kernel will make the mount available in /proc/self/mountinfo.
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