configfs_re...efault_group(9)

💅 configfs_re...efault_group(9) — like, the whole Kernel API Manual moment, but make it make sense 🎀

okay bestie, sit down, hydrate, and let me tell you about the single most "just let me set up my child group already" function in the whole configfs-verse. this one is from the Kernel API Manual and she's here to do exactly one job and do it iconically. ✨

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🌸 NAME 🌸

configfs_register_default_group — allocates and registers a child group. that's it, that's the whole vibe. allocate 🫶 register 🫶 done.

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🦋 SYNOPSIS 🦋

struct config_group * configfs_register_default_group (struct
       config_group *parent_group , const char *name , const struct
       config_item_type *item_type );

not me reading this signature three times just to appreciate it 😭 it's giving "three arguments, zero drama."

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💖 ARGUMENTS 💖

• parent_group — the parent group. the main character that this new baby group is gonna be attached to. 👑
• name — the child group's name. what you're gonna call her. 🎀
• item_type — the child item type description. the whole personality sheet, fr fr.

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✨ DESCRIPTION ✨

okay so this is the boilerplate for allocating and registering a child group with its parent — both jobs, one function, we love an efficient queen. 🔥

and here's the little detail you cannot skip: we need kzalloc'ed memory because the child's default_group is initially empty at the moment we hand it over. so like, zeroed-out memory isn't a suggestion here, it's the whole point. no cap. 💅

bestie do not just kmalloc this and hope for the best — the docs said kzalloc'ed, and the docs are not playing. 🙈

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⭐ RETURN ⭐

• the allocated config group — slay, you got your group 🎉
• or ERR_PTR on error — so check it, don't just assume she ate 😭

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🧚 SEE ALSO 🧚

• Kernel file ./fs/configfs/dir.c — the source of truth, go read her
• configfs_create_dir(9)
• configfs_remove_dir(9)
• configfs_register_group(9)
• configfs_unregister_group(9)
• configfs_unregister_default_group(9)

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and that's the page, bestie!! 🌈 brought to you straight out of ./fs/configfs, dated October 2026 — mwah, sending you the biggest smooch, go register some groups responsibly 💜🫶💖