securityfs_create_dir(9)

📦 version 7.3.1, in nixpkgs unstable

💅 securityfs_create_dir(9) — the Kernel API Manual moment

okay so bestie, welcome to securityfs_create_dir(9) from the Kernel API Manual. yes we're in kernel land. yes there will be dentries. no you cannot just mkdir and go home. let's get into it 🫶

✨ NAME ✨

securityfs_create_dir — literally creates a directory inside the securityfs filesystem. that's the whole vibe. iconic behaviour, honestly 🎀

🌸 SYNOPSIS 🌸

struct dentry * securityfs_create_dir (const char *name , struct dentry *parent );

look at her. one pointer in, two args, struct dentry * coming back out. main character signature ngl ✨

🦋 ARGUMENTS 🦋

  • name — a pointer to a string holding the name of the directory you wanna create. just the name. that's it. that's the girl 💅
  • parent — a pointer to the parent dentry for this file. bestie, this should be a directory dentry if you set it. and if this parameter is NULL, then your directory gets created in the root of the securityfs filesystem instead. so NULL = "put me at the top, idc" 😌

👑 DESCRIPTION 👑

so this function creates a directory in securityfs with the given name. simple. slay. no cap.

this function returns a pointer to a dentry if it succeeds. important part, listen up 🚨: that pointer must be passed to the securityfs_remove function when the file is to be removed. and no — there is no automatic cleanup if your module gets unloaded. you are responsible here. you. personally. the accountability is giving very much main character energy 😭

if an error occurs, the function will return the error value (via ERR_PTR). so like, check your returns, bestie, fr fr 🙈

lowkey crucial: if securityfs is not enabled in the kernel, the value -ENODEV is returned. so if you're getting -ENODEV and spiralling, that's why 💀

🔥 SEE ALSO 🔥

go read the whole friend group, they all hang out together 🧚

🌈 the cute sign-off 🌈

this lil page lives at ./security in the source tree, and it's dated October 2026 — yes, from the future, we don't ask questions 🕰️✨ and the header said securityfs_create_dir(9) from the Kernel API Manual, which you already knew because you're a scholar and a genius. periodt. 💖

📦 where this page comes from