nfsd_nl_unlock_export_doit(9)

📦 version 7.3.1, in nixpkgs unstable

💅 nfsd_nl_unlock_export_doit(9) 💅

ok so this is a page from the Kernel API Manual, bestie, and today's main character is nfsd_nl_unlock_export_doit — yes that's a mouthful, we're gonna get through it together 🫶

✨ NAME ✨

nfsd_nl_unlock_export_doit — revoke NFSv4 state for an export path

like, it goes in and just. takes the state away. for a path. iconique 💅

🌸 SYNOPSIS 🌸

int nfsd_nl_unlock_export_doit (struct sk_buff *skb , struct genl_info
*info );

two args, both pointers, very demure ✨

🎀 ARGUMENTS 🎀

  • skb — the reply buffer. it's where the answer goes back out 💌
  • info — the netlink metadata and the command arguments. yes, both. it's giving multitasking 👑

🦋 DESCRIPTION 🦋

okay so picture this: there's an export path, and over time all kinds of NFSv4 state has piled up on it — opens, locks, delegations, layouts — and it doesn't matter which client is holding onto it, honestly, we are not doing the whole "whose is whose" thing today 😭

this function revokes all of it. all the NFSv4 state acquired through any export of the given path. periodt 🔥

who calls it? userspace does — specifically exportfs -u — and it sends this command after removing the last client for a path, so the underlying filesystem can finally be unmounted. the vibe check passes, the fs gets to go home 🌈

⚠️ lowkey important comparison coming: this is not the same as NFSD_CMD_UNLOCK_FILESYSTEM, which operates at superblock granularity. that one's out here doing whole-superblock things. this one is way more targeted — it revokes only the state associated with exports of a specific path. narrower scope, same energy 💖

⭐ RETURN ⭐

0 on success, or a negative errno. that's it, that's the whole story 🙈

👑 SEE ALSO 👑

like, the whole friend group showed up to the function's birthday party, no cap 🎂

and that's the page!! 🧚 this one lives in ./fs/nfsd and it's dated October 2026 — mark your calendar bestie, and remember: nfsd_nl_unlock_export_doit(9), always and forever 💜💖✨

📦 where this page comes from