May 14, 2017 · By coincidence your tmpfs use is about the same size as the unassigned space. I can see how you would assume that is where your HDD is being used up if you don't know how the filesystems work. As explained by Florian, tmpfs are RAMdrives and have nothing to do with your HDD. udev is the device path, it also is not related to HDD space.

Jun 3, 2019 · The tmpfs driver ignores the “device name” since it doesn't load data from anywhere. These filesystems are created by mounting them and are destroyed by unmounting them. For example, the following command creates a tmpfs filesystem whose contents is just the root directory (all tmpfs filesystems start out this way), owned by root and with ...

Jun 12, 2019 · tmpfs - essentially is a virtual filesystem located in RAM instead of a disk device. Since it's a filesystem, data saved there has a certain order, just like a regular filesystem for a disk storage would have, however the files reside in memory and are not persistent (that is, those files will be gone next time you power off the computer - and ...

Apr 30, 2024 · tmpfs isn’t a pseudo file system, it’s a real file system that stores its contents in virtual memory. The difference is that pseudo file systems offer a representation of something else, whereas real file systems store artefacts directly.

May 10, 2018 · Recent 2.6 Linux kernel builds have started to offer /dev/shm as shared memory in the form of a ramdisk, more specifically as a world-writable directory that is stored in memory with a defined limit in /etc/default/tmpfs. /dev/shm support is …

Oct 26, 2022 · On such systems, masking and unmasking the unit is the appropriate way of disabling or enabling a tmpfs /tmp, as documented in the API File Systems documentation. Other systems such as Debian 12 and older don’t ship tmp.mount in a directly-usable location ; this is why you need to copy it to /etc/systemd/system if you want to use it.

Dec 9, 2011 · Linux provides a tmpfs device which any user can use, /dev/shm. It is not mounted to a specific directory by default, but you can still use it as one. Simply create a directory in /dev/shm and then symlink it to wherever you want. You can give the created directory any permissions you choose, so that other users can't access it.

If CONFIG_TMPFS is not set, the user visible part of tmpfs is not build. But the internal mechanisms are always present. glibc 2.2 and above expects tmpfs to be mounted at /dev/shm for POSIX shared memory (shm_open, shm_unlink). Adding the following line to /etc/fstab should take care of this: tmpfs /dev/shm tmpfs defaults 0 0

Jan 5, 2024 · Support for extended attributes was added to tmpfs in 2011, but without support for user extended attributes. The latter was recently enabled, so to get support for user extended attributes, you need a 6.6 kernel or later, with TMPFS_XATTR enabled.

tmpfs works the same as ramfs, except that it can use swap space if you have one. I.e. if you need RAM for something else, the Least Recently Used algorithms may select data blocks from tmpfs and swap them to disk. Most people stick with tmpfs, because it also lets you limit the total size, and shows the space used correctly e.g. in the df ...