I'm looking for info about mounting a tmpfs partition and sync option. Sync makes the data beeing dumped onto the disk without beeing saved in cache. This works with ext4 and other filesystems. I'm wondering is even a tmpfs partition needs the sync option to be specified or it is enabled by default since it is a RAM partition. In my option it would be odd if a ramdisk would be cached in RAM.
tmpfs /tmp tmpfs defaults,sync,noatime,nosuid,nodev,noexec,mode=0777,size=400M 0 0
In a tmpfs partition is sync enabled by default?