New answers tagged tmpfs
You can resolve which filesystem a directory or file is on with the command df, and if you include the -T option, the output will include the filesystem type. $ df -T /tmp Filesystem Type 1K-blocks Used Available Use% Mounted on /dev/sda3 ext4 38715020 5073600 31674780 14% / In the above example, the /tmp directory is on an ext4 filesystem, ...
The mount command shows what is currently mounted. $ mount|grep -i tmp none on /tmp type tmpfs (rw)
On Debian, and likely its derivatives, the script which handles unmounts before halt/reboot is /etc/init.d/umountfs. For me, the script does not umount any of the filesystems you have listed apart from tmpfs. The reason is given in the following comment: # Make sure tmpfs file systems are umounted before turning off # swap, to avoid running out of memory ...
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