The NFSv4 protocol allows state to be revoked by the admin and has error
codes which allow this to be communicated to the client.

This patch
 - introduces a new state-id status NFS4_STID_ADMIN_REVOKE
   which can be set on open, lock, or delegation state.
 - reports NFS4ERR_ADMIN_REVOKED when these are accessed
 - introduces a per-client counter of these states and returns
   SEQ4_STATUS_ADMIN_STATE_REVOKED when the counter is not zero.
   Decrements this when freeing any admin-revoked state.
 - introduces stub code to find all interesting states for a given
   superblock so they can be revoked via the 'unlock_filesystem'
   file in /proc/fs/nfsd/
   No actual states are handled yet.

Signed-off-by: NeilBrown <redacted>
---
 fs/nfsd/nfs4state.c | 71 ++++++++++++++++++++++++++++++++++++++++++++-
 fs/nfsd/nfsctl.c    |  1 +
 fs/nfsd/nfsd.h      |  1 +
 fs/nfsd/state.h     | 10 +++++++
 fs/nfsd/trace.h     |  3 +-
 5 files changed, 84 insertions(+), 2 deletions(-)

diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index b9239f2ebc79..477a9e9aebbd 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c

@@ -1215,6 +1215,8 @@ nfs4_put_stid(struct nfs4_stid *s)
 		return;
 	}
 	idr_remove(&clp->cl_stateids, s->sc_stateid.si_opaque.so_id);
+	if (s->sc_status & NFS4_STID_ADMIN_REVOKED)
+		atomic_dec(&s->sc_client->cl_admin_revoked);
 	nfs4_free_cpntf_statelist(clp->net, s);
 	spin_unlock(&clp->cl_lock);
 	s->sc_free(s);

@@ -1534,6 +1536,8 @@ static void put_ol_stateid_locked(struct nfs4_ol_stateid *stp,
 	}
 
 	idr_remove(&clp->cl_stateids, s->sc_stateid.si_opaque.so_id);
+	if (s->sc_status & NFS4_STID_ADMIN_REVOKED)
+		atomic_dec(&s->sc_client->cl_admin_revoked);
 	list_add(&stp->st_locks, reaplist);
 }
 

@@ -1679,6 +1683,54 @@ static void release_openowner(struct nfs4_openowner *oo)
 	nfs4_put_stateowner(&oo->oo_owner);
 }
 
+static struct nfs4_stid *find_one_sb_stid(struct nfs4_client *clp,
+					  struct super_block *sb,
+					  unsigned int sc_types)
+{
+	unsigned long id, tmp;
+	struct nfs4_stid *stid;
+
+	spin_lock(&clp->cl_lock);
+	idr_for_each_entry_ul(&clp->cl_stateids, stid, tmp, id)
+		if ((stid->sc_type & sc_types) &&
+		    stid->sc_status == 0 &&
+		    stid->sc_file->fi_inode->i_sb == sb) {
+			refcount_inc(&stid->sc_count);
+			break;
+		}
+	spin_unlock(&clp->cl_lock);
+	return stid;
+}
+

+				}
+				nfs4_put_stid(stid);
+				spin_lock(&nn->client_lock);
+				goto retry;
+			}
+		}
+	}
+	spin_unlock(&nn->client_lock);
+}
+
 static inline int
 hash_sessionid(struct nfs4_sessionid *sessionid)
 {

@@ -2550,6 +2602,8 @@ static int client_info_show(struct seq_file *m, void *v)
 	}
 	seq_printf(m, "callback state: %s\n", cb_state2str(clp->cl_cb_state));
 	seq_printf(m, "callback address: %pISpc\n", &clp->cl_cb_conn.cb_addr);
+	seq_printf(m, "admin-revoked states: %d\n",
+		   atomic_read(&clp->cl_admin_revoked));
 	drop_client(clp);
 
 	return 0;

@@ -4109,6 +4163,8 @@ nfsd4_sequence(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 	}
 	if (!list_empty(&clp->cl_revoked))
 		seq->status_flags |= SEQ4_STATUS_RECALLABLE_STATE_REVOKED;
+	if (atomic_read(&clp->cl_admin_revoked))
+		seq->status_flags |= SEQ4_STATUS_ADMIN_STATE_REVOKED;
 out_no_session:
 	if (conn)
 		free_conn(conn);

@@ -4597,7 +4653,9 @@ nfsd4_verify_open_stid(struct nfs4_stid *s)
 {
 	__be32 ret = nfs_ok;
 
-	if (s->sc_status & NFS4_STID_REVOKED)
+	if (s->sc_status & NFS4_STID_ADMIN_REVOKED)
+		ret = nfserr_admin_revoked;
+	else if (s->sc_status & NFS4_STID_REVOKED)
 		ret = nfserr_deleg_revoked;
 	else if (s->sc_status & NFS4_STID_CLOSED)
 		ret = nfserr_bad_stateid;

@@ -5188,6 +5246,11 @@ nfs4_check_deleg(struct nfs4_client *cl, struct nfsd4_open *open,
 	deleg = find_deleg_stateid(cl, &open->op_delegate_stateid);
 	if (deleg == NULL)
 		goto out;
+	if (deleg->dl_stid.sc_status & NFS4_STID_ADMIN_REVOKED) {
+		nfs4_put_stid(&deleg->dl_stid);
+		status = nfserr_admin_revoked;
+		goto out;
+	}
 	if (deleg->dl_stid.sc_status & NFS4_STID_REVOKED) {
 		nfs4_put_stid(&deleg->dl_stid);
 		status = nfserr_deleg_revoked;

@@ -6508,6 +6571,8 @@ nfsd4_lookup_stateid(struct nfsd4_compound_state *cstate,
 		 */
 		statusmask |= NFS4_STID_REVOKED;
 
+	statusmask |= NFS4_STID_ADMIN_REVOKED;
+
 	if (ZERO_STATEID(stateid) || ONE_STATEID(stateid) ||
 		CLOSE_STATEID(stateid))
 		return nfserr_bad_stateid;

@@ -6526,6 +6591,10 @@ nfsd4_lookup_stateid(struct nfsd4_compound_state *cstate,
 		nfs4_put_stid(stid);
 		return nfserr_deleg_revoked;
 	}
+	if (stid->sc_type & NFS4_STID_ADMIN_REVOKED) {
+		nfs4_put_stid(stid);
+		return nfserr_admin_revoked;
+	}
 	*s = stid;
 	return nfs_ok;
 }

diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c
index d6eeee149370..a622d773f428 100644
--- a/fs/nfsd/nfsctl.c
+++ b/fs/nfsd/nfsctl.c

@@ -285,6 +285,7 @@ static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size)
 	 * 3.  Is that directory the root of an exported file system?
 	 */
 	error = nlmsvc_unlock_all_by_sb(path.dentry->d_sb);
+	nfsd4_revoke_states(netns(file), path.dentry->d_sb);
 
 	path_put(&path);
 	return error;

diff --git a/fs/nfsd/nfsd.h b/fs/nfsd/nfsd.h
index f5ff42f41ee7..d46203eac3c8 100644
--- a/fs/nfsd/nfsd.h
+++ b/fs/nfsd/nfsd.h

@@ -280,6 +280,7 @@ void		nfsd_lockd_shutdown(void);
 #define	nfserr_no_grace		cpu_to_be32(NFSERR_NO_GRACE)
 #define	nfserr_reclaim_bad	cpu_to_be32(NFSERR_RECLAIM_BAD)
 #define	nfserr_badname		cpu_to_be32(NFSERR_BADNAME)
+#define	nfserr_admin_revoked	cpu_to_be32(NFS4ERR_ADMIN_REVOKED)
 #define	nfserr_cb_path_down	cpu_to_be32(NFSERR_CB_PATH_DOWN)
 #define	nfserr_locked		cpu_to_be32(NFSERR_LOCKED)
 #define	nfserr_wrongsec		cpu_to_be32(NFSERR_WRONGSEC)

diff --git a/fs/nfsd/state.h b/fs/nfsd/state.h
index bb00dcd4c1ba..584378c43e0a 100644
--- a/fs/nfsd/state.h
+++ b/fs/nfsd/state.h

@@ -112,6 +112,7 @@ struct nfs4_stid {
 #define NFS4_STID_CLOSED	BIT(0)
 /* For a deleg stateid kept around only to process free_stateid's: */
 #define NFS4_STID_REVOKED	BIT(1)
+#define NFS4_STID_ADMIN_REVOKED	BIT(2)

 	unsigned short		sc_status;
 
 	struct list_head	sc_cp_list;

@@ -388,6 +389,7 @@ struct nfs4_client {
 	clientid_t		cl_clientid;	/* generated by server */
 	nfs4_verifier		cl_confirm;	/* generated by server */
 	u32			cl_minorversion;
+	atomic_t		cl_admin_revoked; /* count of admin-revoked states */
 	/* NFSv4.1 client implementation id: */
 	struct xdr_netobj	cl_nii_domain;
 	struct xdr_netobj	cl_nii_name;

@@ -752,6 +754,14 @@ static inline void get_nfs4_file(struct nfs4_file *fi)
 }
 struct nfsd_file *find_any_file(struct nfs4_file *f);
 
+#ifdef CONFIG_NFSD_V4
+void nfsd4_revoke_states(struct net *net, struct super_block *sb);
+#else
+static inline void nfsd4_revoke_states(struct net *net, struct super_block *sb)
+{
+}
+#endif
+
 /* grace period management */
 void nfsd4_end_grace(struct nfsd_net *nn);
 

diff --git a/fs/nfsd/trace.h b/fs/nfsd/trace.h
index 568b4ec9a2af..281aeb42c9eb 100644
--- a/fs/nfsd/trace.h
+++ b/fs/nfsd/trace.h

@@ -651,7 +651,8 @@ DEFINE_STATESEQID_EVENT(open_confirm);
 #define show_stid_status(x)						\
 	__print_flags(x, "|",						\
 		{ NFS4_STID_CLOSED,		"CLOSED" },		\
-		{ NFS4_STID_REVOKED,		"REVOKED" })		\
+		{ NFS4_STID_REVOKED,		"REVOKED" },		\
+		{ NFS4_STID_ADMIN_REVOKED,	"ADMIN_REVOKED" })
 
 DECLARE_EVENT_CLASS(nfsd_stid_class,
 	TP_PROTO(

-- 
2.42.1