nfsd4_revoke_export_states(9)

💅 nfsd4_revoke_export_states(9) 💅

okay so bestie, welcome to the Kernel API Manual entry for nfsd4_revoke_export_states ✨ — this is the manual page header btw, the title's right there and the manual name is Kernel API Manual, we're all caught up 🫶

---

🌸 NAME 🌸

nfsd4_revoke_export_states — revoke nfsv4 states acquired through an export. that's it. that's the whole vibe check 👑

---

✨ SYNOPSIS ✨

void nfsd4_revoke_export_states (struct nfsd_net *nn , const struct path
*path );

like literally just two args and no return value, she's a void, she doesn't owe you a result 💅

---

🎀 ARGUMENTS 🎀

• nn — used to identify the instance of nfsd (there is one per net namespace). so like, one nfsd per net ns, and nn is how you say which one, iykyk 🦋
• path — the export path whose states should be revoked. yeah. that one 🌸

---

💖 DESCRIPTION 💖

Okay so here's the tea ☕ — all nfs4 states acquired through any export matching path get revoked. and when we say all, we mean:

• open
• lock
• delegation
• layout

all four, babes 🔥 and it does not care which client holds them. doesn't matter whose states they are, they're getting revoked, periodt 💀

The matching is done by path identity — that's dentry + vfsmount, no cap — so multiple svc_export objects for the same path, one per auth_domain, are handled correctly. the way that just works is honestly iconic 👑

Userspace (exportfs -u) sends this after removing the last client for a path, which enables the underlying filesystem to be unmounted. so it's the little cleanup gremlin that lets the unmount happen 🧚✨

---

🦋 CONTEXT 🦋

⚠️ bestie read this part for real ⚠️

The caller must hold nfsd_mutex with NFSD_NET_UP set. Outside that window nn->conf_id_hashtbl is unallocated or freed, so the walk would dereference a NULL or dangling pointer. like, actual crash material 😭 so please, hold the mutex, keep NFSD_NET_UP set, do not skip this, fr fr 🙈

---

🌈 SEE ALSO 🌈

Kernel file ./fs/nfsd/nfs4state.c — and the whole friend group:

• nfs4_delegation_exists(9)
• hash_delegation_locked(9)
• revoke_delegation(9)
• nfs4_replay_free_cache(9)
• nfsd4_revoke_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_release_lockowner(9)
• nfsd4_vet_deleg_time(9)
• nfsd4_deleg_getattr_conflict(9)
• nfsd_get_dir_deleg(9)
• nfsd_update_cmtime_attr(9)

---

and that's the whole page, bestie 🎀 mwah 💋

sign-off time: this one lives in ./fs/nfsd, dated October 2026, and it's the nfsd4_revoke_export_states(9) page — go revoke some states responsibly, ily 💜🦋✨