UNIONFS(4)

📦 version 15.1, in freebsd 15.1, nixpkgs unstable

✨ UNIONFS(4) ✨

okay so bestie, this is the manual page for unionfs — the union mount file system — straight out of the Kernel Interfaces Manual and honestly it's giving iconic kernel energy 💅

🌸 SYNOPSIS 🌸

so like, if you wanna compile this driver into the kernel (yes, the whole kernel, main character move ✨), you gotta put these lines in your kernel configuration file:

option UNIONFS

alternatively — and this is lowkey the easier way ngl — you can load the driver as a module at boot time by putting this line in loader.conf(5):

unionfs_load="YES"

periodt. that's it. that's the synopsis 🎀

🦋 DESCRIPTION 🦋

okay so the UNIONFS driver? it's literally an implementation of a stackable unification filesystem. no cap. that's the whole vibe — it unifies stuff in a stackable way and honestly we're obsessed with how tidy that is 💖

🔥 SEE ALSO 🔥

⭐ STANDARDS ⭐

the receipts, bestie, we love a good citation moment 📚✨:

  • J. S. Pendry and M. K. McKusick, Union mounts in 4.4BSD-Lite, Proceedings of the USENIX Technical Conference on UNIX and Advanced Computing Systems, December 1995.
  • P. H. Kamp and R. N. M. Watson, Jails: Confining the omnipotent root, Proceedings of the Second International System Administration and Networking Conference (SANE2000), May 2000.

like, actual academic papers, we stan a filesystem with lore 🫶

🌈 HISTORY 🌈

the unionfs device driver first appeared in FreeBSD 5.0. a whole legend was born 😭💜

👑 AUTHORS 👑

so the unionfs device driver was written by Jan-Simon Pendry for 4.4BSD, and then Masanori OZAWA <ozawa@ongs.co.jp> reimplemented the handling of the locking for FreeBSD 7.0. and the manual page was written by Gordon Bergling <gbe@FreeBSD.org>. kings, all of them 🌟

💀 BUGS 💀

bestie please 😭 — for a list of bugs regarding the unionfs filesystem, go see the mount_unionfs(8) manual page. they put the whole bug list over there, iykyk 🙈

fr fr, that's the whole page. short, sweet, stackable. vibe check passed ✅

Debian · April 27, 2020 · UNIONFS(4) — slayed by the manual page gods, mwah 💋🎀

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