nlmsvc_lookup_host(9)

💅 nlmsvc_lookup_host(9) — like, the Kernel API Manual but make it make sense ✨

Okay bestie, gather 'round, because we're about to vibe-check a kernel function from the nlmsvc_lookup_host(9) page in the Kernel API Manual. No cap, this one's lowkey iconic for anyone doing NLM (Network Lock Manager) stuff. Let's get into it 💖

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🌸 SYNOPSIS 🌸

struct nlm_host * nlmsvc_lookup_host (const struct svc_rqst *rqstp ,
const char *hostname , const size_t hostname_len );

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🎀 ARGUMENTS 🎀

• rqstp — the incoming NLM request, like the whole receipt of what just showed up at your door 🫶
• hostname — name of client host, aka who's tryna talk to you
• hostname_len — length of client hostname, because we gotta be precise, periodt 💅

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✨ DESCRIPTION ✨

So here's the tea ☕: this function returns an nlm_host structure that matches the [client address, transport protocol, NLM version, client hostname] of the passed-in NLM request. If one doesn't already exist in the host cache, a new handle is created and returned. It's giving "if you don't have a friend like this yet, I'll literally make you one" energy 🔥

Before possibly creating a new nlm_host, it constructs a sockaddr for a specific source address, just in case the local system has multiple network addresses — because our local machine is a main character with many faces, and we gotta pick the right one 💁‍♀️

And listen, the family of the address in rq_daddr is guaranteed to be the same as the family of the address in rq_addr, so it's safe to use the same family for the source address. No mixing and matching, no chaos, we stan a consistent family 🧚✨

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🌈 SEE ALSO 🌈

• Kernel file ./fs/lockd/host.c — nlmclnt_lookup_host(9)
• nlmclnt_release_host(9)
• nlmclnt_shutdown_rpc_clnt(9)
• nlmsvc_release_host(9)
• nlm_rebind_host(9)
• nlm_host_rebooted(9)

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Seriously bestie, if you're messing with lockd host handles, read the whole family of functions above. They're all in ./fs/lockd and they're all important, iykyk 💀

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Okay that's the whole page, no skips, no summaries, every flag and path accounted for 👑

Stay slaying out there in kernel land 🦋 — and remember, this lil masterpiece lives in ./fs/lockd and was dated October 2026 in the manual, so when you see it, just know: iconic behavior, documented. Byeee! 💜🎀