nfsd_nl_cache_flush_doit(9)

📦 version 7.3.1, in nixpkgs unstable

💅 nfsd_nl_cache_flush_doit(9) — from the Kernel API Manual, bestie 🎀

okay so this is a page from the Kernel API Manual about nfsd_nl_cache_flush_doit, and honestly? it's giving "tiny function, big cleanup energy." let's get into it ✨

🌸 NAME 🌸

nfsd_nl_cache_flush_doit — flush nfsd caches via netlink 🧹💨

like, the whole job. cache go bye. through netlink. slay.

✨ SYNOPSIS ✨

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

yup, that's the whole signature. she's short and she knows it 💅

🦋 ARGUMENTS 🦋

  • skb — the reply buffer 🫶 like, this is where the answer goes back out, okay?
  • info — netlink metadata and command arguments 🗂️ everything the netlink layer knows about the call plus the args that came with it. very main character.

👑 DESCRIPTION 👑

okay so the actual tea ☕: this bad girl flushes the svc_export and/or expkey caches. yes, and/or — she's flexible like that 💁‍♀️

here's the vibe check on the bitmask:

  • if NFSD_A_CACHE_FLUSH_MASK is provided, then only the caches indicated by the bitmask get flushed 🎯
    • bit 0 = svc_export
    • bit 1 = expkey
  • if it's omitted? she flushes both. no crumbs left. periodt. 🧽

and the return situation:

  • returns 0 on success 🎉
  • returns a negative errno if something goes sideways 😭
ngl, that's the whole contract — success is 0, failure is negative errno, and the bitmask is optional. don't overthink it, bestie 💖

🌈 SEE ALSO 🌈

the kernel file ./fs/nfsd/nfsctl.c obviously 👀 and then the whole friend group:

go read them. iykyk 🔥

🍓 a lil sign-off 🍓

this page lives under ./fs/nfsd and it's dated October 2026 — so yeah, technically a future icon 👑💜 anyway bestie, go flush those caches, drink some water, and remember: bit 0 is svc_export, bit 1 is expkey. mwah 🫶💖

📦 where this page comes from