fscrypt_policy_from_context(9)

📦 version 7.3.1, in nixpkgs unstable

💖 fscrypt_policy_from_context 💖

okay so bestie, welcome to the Kernel API Manual ✨ this one is a lil function that turns your fscrypt_context into an fscrypt_policy, and honestly? it's giving "glow-up transformation" 🦋

🌸 NAME 🌸

fscrypt_policy_from_context — convert an fscrypt_context to an fscrypt_policy 💅

✨ SYNOPSIS ✨

int fscrypt_policy_from_context (union fscrypt_policy *policy_u , const
union fscrypt_context *ctx_u , int ctx_size );

🎀 ARGUMENTS 🎀

  • policy_u — the output policy 🫶 this is where the magic lands
  • ctx_u — the input context, aka the raw material you're feeding in
  • ctx_size — how big the input context is, in bytes (yes, bytes, we're counting 🔥)

💅 DESCRIPTION 💅

Given an fscrypt_context, build the corresponding fscrypt_policy. Literally that's it, no cap — context in, policy out, slay ✨

but bestie, listen: this does not validate the settings within the policy itself — like the modes, flags, and reserved bits? yeah, not its job 🙈 if you want that check done, use fscrypt_supported_policy for it. this function is just the converter, not the bouncer at the door 💀

🌈 RETURN 🌈

  • 0 on success — we love a clean win 👑
  • -EINVAL if the fscrypt_context has an unrecognized version number or size — like, it doesn't recognize the vibe check 💀

🦋 SEE ALSO 🦋

Kernel file ./fs/crypto/policy.c plus the whole squad:

and that's the whole page, bestie 🫶 this iconic lil number lives in ./fs/crypto and the version/date stamp on it is October 2026 — periodt 💜

📦 where this page comes from