sysfs_file_change_owner(9)

💅 sysfs_file_change_owner — the "who even owns this file" glow-up

okay so real talk bestie, we're in the Kernel API Manual, section 9, and today's main character is sysfs_file_change_owner. yes it's a long name. yes it slays. let's get into it 🎀

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✨ SYNOPSIS ✨

int sysfs_file_change_owner (struct kobject *kobj , const char *name ,
kuid_t kuid , kgid_t kgid );

like, that's the whole vibe. four things go in, one int comes out. no cap. 💖

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🌸 ARGUMENTS 🌸

• kobj — the object. your anchor. the thing everything hangs off of, literally the main character of this whole operation 👑
• name — name of the file to change. bestie you gotta tell it which file, it's not a mind reader 🙈
• kuid — new owner's kuid. the incoming user id, fresh fit and all 💅
• kgid — new owner's kgid. the incoming group id, matching energy ⭐

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🦋 DESCRIPTION 🦋

so here's the tea: this function looks up the sysfs entry called name under kobj, and then changes the ownership over to kuid/kgid. that's it. that's the whole arc. it's giving "find the file, hand over the keys" 🔥

Returns 0 on success or an error code on failure. lowkey the most reliable thing in your life tbh 😭

ngl if it comes back non-zero, something went sideways — that int is the vibe check and you should actually read it, fr fr.

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💜 SEE ALSO 💜

the whole friend group, in order:

• Kernel file ./fs/sysfs/file.c
• sysfs_create_file_ns(9)
• sysfs_add_file_to_group(9)
• sysfs_chmod_file(9)
• sysfs_break_active_protection(9)
• sysfs_unbreak_active_protection(9)
• sysfs_remove_file_ns(9)
• sysfs_remove_file_self(9)
• sysfs_remove_file_from_group(9)
• sysfs_create_bin_file(9)
• sysfs_remove_bin_file(9)
• sysfs_link_change_owner(9)
• sysfs_change_owner(9)
• sysfs_emit(9)
• sysfs_emit_at(9)
• sysfs_bin_attr_simple_read(9)

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and that's the post 🫶 this little icon came from ./fs/sysfs, stamped October 2026 — go forth and reassign ownership responsibly, bestie 💖✨🎀