nfs4_test_session_trunk(9)

💅 nfs4_test_session_trunk(9) ✨

Okay bestie, so this is a page straight out of the Kernel API Manual — nfs4_test_session_trunk(9) — and yes, the name is a whole mouthful, but we're gonna get through it together 🫶

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🌸 NAME 🌸

nfs4_test_session_trunk —

Not me leaving the description blank 😭 that's literally it, that's the whole NAME section. Iconic, mysterious, gives nothing away. Respect.

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✨ SYNOPSIS ✨

void nfs4_test_session_trunk (struct rpc_clnt *clnt , struct rpc_xprt
*xprt , void *data );

Three args, returns void, no notes. She's a simple girlie doing a simple job 💅

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🎀 ARGUMENTS 🎀

• clnt — a struct rpc_clnt, and specifically the one that's gonna get a shiny new transport. It's giving "here's your client, go make her faster" 💖
• xprt — the rpc_xprt you're testing. This is the transport candidate — the vibe check happens here, no cap.
• data — the call data for _nfs4_proc_exchange_id. Lowkey the payload that gets handed along to the exchange-id machinery.

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🦋 DESCRIPTION 🦋

So here's the tea ☕ — this function is an add_xprt_test test function, and it gets called from rpc_clnt_setup_test_and_add_xprt. It's a callback, bestie, it doesn't just show up on its own.

The rpc_xprt_switch is referenced by rpc_clnt_setup_test_and_add_xprt, and it gets dereferenced over in nfs4_exchange_id_release. So the refcount is a two-party situation — one side grabs it, the other side lets it go. Do not break that chain, fr fr 🙈

And then the reward: upon success, the new transport gets added to the rpc_clnt 🔥 That's the whole moment. The main character energy. The transport is officially in the group chat ✨

Heads up though — that success clause is load-bearing. The add only happens on success, so don't go assuming the transport is in there before you know it went through 💀

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🌈 SEE ALSO 🌈

Kernel file ./fs/nfs/nfs4proc.c and the whole friend group:

• nfs41_check_expired_locks(9)
• nfs41_check_open_stateid(9)
• nfs4_proc_get_rootfh(9)
• nfs4_proc_setclientid(9)
• nfs4_proc_setclientid_confirm(9)
• nfs4_proc_get_locations(9)
• nfs4_proc_fsid_present(9)
• nfs41_test_stateid(9)
• nfs41_free_stateid(9)

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And that's the page, bestie 💜 mwah 💋 — this one lives in ./fs/nfs and it's dated October 2026, so jot that down in your notes app 📝🎀