debugfs_create_file_unsafe(9)

📦 version 7.3.1, in nixpkgs unstable

💅 debugfs_create_file_unsafe(9) — the Kernel API Manual, bestie edition ✨

okay so this is a page from the Kernel API Manual and it's literally about debugfs_create_file_unsafe. yes the name sounds scary. no it's not that deep. come sit with me 🫶

🌸 NAME 🌸

debugfs_create_file_unsafe — create a file in the debugfs filesystem 💖

✨ SYNOPSIS ✨

struct dentry * debugfs_create_file_unsafe (const char *name , umode_t
mode , struct dentry *parent , void *data , const struct file_operations
*fops );

that's the whole signature, character for character, no cap 👑

🎀 ARGUMENTS 🎀

  • name — a pointer to a string holding the name of the file you wanna create. like, what's it called bestie 🏷️
  • mode — the permission the file should have. the vibe check on who gets to touch it 🔐
  • parent — a pointer to the parent dentry for this file. if it's set, this should be a directory dentry. and if this parameter is NULL, the file gets created in the root of the debugfs filesystem. iconique default behavior 💅
  • data — a pointer to something you'll wanna get back to later. the inode.i_private pointer will point to this value on the open call. it's giving "leave a little note for future you" 📝
  • fops — a pointer to a struct file_operations that should be used for this file 🛠️

🦋 DESCRIPTION 🦋

debugfs_create_file_unsafe is completely analogous to debugfs_create_file — same energy, same everything — the only difference being that the fops you hand it will not get protected against file removals by the debugfs core 😭

⚠️ so like, it's your responsibility to protect your struct file_operation methods against file removals by means of debugfs_file_get and debugfs_file_put. not me doing it for you, bestie. that's on you fr fr 💀

good news though: ->open is still protected by debugfs. so that one's fine, we gotchu 🫶

and any struct file_operations defined by means of DEFINE_DEBUGFS_ATTRIBUTE is protected against file removals and thus, may be used here. lowkey slay ✨

👑 SEE ALSO 👑

Kernel file ./fs/debugfs/inode.c plus these absolute main characters:

that's the whole page bestie, go forth and make files responsibly 💜🌸✨

source/version + date, coming at you from ./fs/debugfs, dated October 2026, and the page is debugfs_create_file_unsafe(9). don't forget me when you're famous 🎀🦋💖

📦 where this page comes from