TMP mount
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Naja, wenn du remount benutzt muss das Filesystem bereits schonmal gemountet worden sein.
Wo willst du /tmp überhaupt hinmounten?
Suchst du vielleicht sowas wie --bind?
Auszug aus dem mount manual
remount
Attempt to remount an already-mounted file system. This is com‐
monly used to change the mount flags for a file system, espe‐
cially to make a readonly file system writeable. It does not
change device or mount point.
The remount functionality follows the standard way how the mount
command works with options from fstab. It means the mount com‐
mand doesn’t read fstab (or mtab) only when a device and dir are
fully specified.
mount -o remount,rw /dev/foo /dir
After this call all old mount options are replaced and arbitrary
stuff from fstab is ignored, except the loop= option which is
internally generated and maintained by the mount command.
mount -o remount,rw /dir
After this call mount reads fstab (or mtab) and merges these
options with options from command line ( -o ).