STRUCT LANDLOCK_INODE_SECURITY(9)

💅 STRUCT LANDLOCK_INODE_SECURITY — the Kernel API Manual you didn't know you needed

okay so bestie, welcome to the Kernel API Manual page for struct landlock_inode_security, no cap. this is the lil security blob that lives on an inode and it's lowkey doing a whole synchronization ballet. let's get into it 🩰

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✨ NAME ✨

struct landlock_inode_security — literally the Inode security blob. that's it, that's the vibe. 🎀

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🌸 SYNOPSIS 🌸

struct landlock_inode_security {
    struct landlock_object *object;
};

one member. singular. main character energy, honestly 👑

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🦋 MEMBERS 🦋

• object — a weak pointer to an allocated object. bestie, weak is the operative word here, she does not own it 💅

so like, all the assignments of a new object are protected by the underlying inode->i_lock. that part's easy.

BUT — and this is the part where you gotta pay attention — atomically disassociating object from the inode is only protected by object->lock, from the time object's usage refcount drops to zero until the time this pointer is nulled out (cf. release_inode and hook_sb_delete). 😭

and fr fr, such disassociation does not require inode->i_lock, and the reason is genuinely iconic: it's all thanks to the careful rcu_access_pointer check performed by get_inode_object. she thought about it so you don't have to 🫶

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🌈 DESCRIPTION 🌈

this is what enables you to reference a struct landlock_object that's tied to an inode (aka the underlying object). that's the whole point of her existence ✨

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🔥 SEE ALSO 🔥

• Kernel file ./security/landlock/fs.h
• struct landlock_file_security(9)
• struct landlock_superblock_security(9)
• resolve_path_for_trace(9)

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⚠️ quick vibe check: those synchronization rules are not decorative. weak pointer + refcount-to-zero + object->lock is the contract, so don't go messing with the ordering and then act surprised 💀

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okay that's the page!! this absolute queen lives in ./security/landlock, dated October 2026, and she's filed under struct landl...ode_security(9) in your man pages. go forth and be safe with your inodes, ily, bye 🧚💜