key_payload_reserve(9)

💖 key_payload_reserve 💖

okay so bestie, this is the Kernel API Manual page for key_payload_reserve — and yes, it’s giving “adjust the quota reservation for a key’s payload” realness. Let’s get into it 🫶

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✨ NAME ✨

• key_payload_reserve — adjust the data quota reservation for the key’s payload, periodt 💅

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🦋 SYNOPSIS 🦋

int key_payload_reserve (struct key *key , size_t datalen );

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🎀 ARGUMENTS 🎀

• key — the key you’re making the reservation for 🗝️
• datalen — the amount of data payload the caller now wants 📦

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💅 DESCRIPTION 💅

So the way this works is: it adjusts the amount of the owning user’s key data quota that a key reserves. Lowkey important stuff ✨

If the amount is increased, then -EDQUOT may be returned if there isn’t enough free quota available — so yeah, watch out for that 😭

If it’s successful, 0 is returned. Slay. 🫶

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🌈 SEE ALSO 🌈

• kernel file: ./security/keys/key.c
• key_alloc(9)
• key_instantiate_and_link(9)
• key_reject_and_link(9)
• key_put(9)
• key_create_or_update(9)
• key_create(9)
• key_update(9)
• key_revoke(9)
• key_invalidate(9)
• generic_key_instantiate(9)
• register_key_type(9)
• unregister_key_type(9)

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xoxo from ./security/keys, October 2026 — key_payload_reserve(9) out 💅🎀