get_subdir(9)

🌸 NAME 🌸

Okay bestie, welcome to get_subdir(9) from the Kernel API Manual — the function that will find or create a subdir with the specified name. That’s the whole assignment, and it ate 💅✨

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✨ SYNOPSIS ✨

struct ctl_dir * get_subdir (struct ctl_dir *dir , const char *name ,
       int namelen );

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🎀 ARGUMENTS 🎀

• dir — the directory where you wanna create the subdirectory 🫶
• name — the name of the subdirectory to find or create, iconic behavior honestly 🌟
• namelen — the length of name, yes bestie we need the length too 💖

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🦋 DESCRIPTION 🦋

So here’s the vibe: this function takes a directory with an elevated reference count so we know that if we drop the lock, the directory will not go away 😭👑

Upon success, the reference is moved from dir to the returned subdirectory. Slay. Upon error, an error code is returned and the reference on dir is simply dropped. No cap, that’s the whole deal 💀✨

Bestie reminder: success = reference moves from dir to the returned subdir. Error = error code comes back and the reference on dir is just dropped. Periodt. 💅

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🔥 SEE ALSO 🔥

Kernel file ./fs/proc/proc_sysctl.c — go peek at these too, iykyk:

• register_sysctl_mount_point(9)
• __register_sysctl_table(9)
• register_sysctl_sz(9)
• __register_sysctl_init(9)
• unregister_sysctl_table(9)

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Catch u later, bestie 🫶 this page comes from ./fs/proc, dated October 2026, and the manual tag is get_subdir(9) 🎀💖✨