nfsd4_release_lockowner(9)

💅 nfsd4_release_lockowner 💅

okay so bestie, welcome to the nfsd4_release_lockowner page — it's from the Kernel API Manual, section 9, and it's literally the function that handles NFSv4.0 RELEASE_LOCKOWNER operations. yes that's a lot of words. we'll get through it together 🫶

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✨ SYNOPSIS ✨

__be32 nfsd4_release_lockowner (struct svc_rqst *rqstp , struct
nfsd4_compound_state *cstate , union nfsd4_op_u *u );

like, copy it exactly, no cap. three args, one __be32 coming back at you 💖

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🎀 ARGUMENTS 🎀

• rqstp — the RPC transaction. the whole request vibe check, basically 🌸
• cstate — the NFSv4 COMPOUND state. this is where the compound op energy lives 🦋
• u — the RELEASE_LOCKOWNER arguments. the actual payload, the main character of this function 💅

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🔥 DESCRIPTION 🔥

so what does it do? it checks whether there are any locks still held 👀 and if there aren't — boom — it frees the lockowner and any lock state that's owned. that's it, that's the whole job. clean, simple, iconic ✨

the way that returning works, though, is giving multiple-choice 😭 here are the return values:

• nfs_ok — lockowner released, or not found 🎉
• nfserr_locks_held — lockowner is still in use, so, awkward, not releasing 💀
• nfserr_stale_clientid — clientid is no longer active 🙈
• nfserr_expired — clientid not recognized 🫠

ngl bestie, if you get nfserr_locks_held it's not an error-error, it just means somebody's still holding on. let it go, queen.

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💜 SEE ALSO 💜

kernel file ./fs/nfsd/nfs4state.c — plus this whole friend group right here:

• nfs4_delegation_exists(9)
• hash_delegation_locked(9)
• revoke_delegation(9)
• nfs4_replay_free_cache(9)
• nfsd4_revoke_states(9)
• nfsd4_revoke_export_states(9)
• nfsd_slot_shrinker_count(9)
• nfsd_slot_shrinker_scan(9)
• nfsd4_put_client(9)
• nfsd_wait_for_delegreturn(9)
• nfsd_breaker_owns_lease(9)
• nfsd4_deleg_lm_open_conflict(9)
• nfsd4_process_open2(9)
• nfsd4_force_end_grace(9)
• nfs4_preprocess_stateid_op(9)
• nfs4_preprocess_seqid_op(9)
• nfsd4_vet_deleg_time(9)
• nfsd4_deleg_getattr_conflict(9)
• nfsd_get_dir_deleg(9)
• nfsd_update_cmtime_attr(9)

like, go read them too, they're all serving in the same file 🧚💖

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and that's the page!! 🌈 this whole thing lives under ./fs/nfsd, dated October 2026, from the Kernel API Manual — mwah, love you, bye 👑💋