Commit 3bd64a5b authored by J. Bruce Fields's avatar J. Bruce Fields
Browse files

nfsd4: implement SEQ4_STATUS_RECALLABLE_STATE_REVOKED 



A 4.1 server must notify a client that has had any state revoked using
the SEQ4_STATUS_RECALLABLE_STATE_REVOKED flag.  The client can figure
out exactly which state is the problem using CHECK_STATEID and then free
it using FREE_STATEID.  The status flag will be unset once all such
revoked stateids are freed.

Our server's only recallable state is delegations.  So we keep with each
4.1 client a list of delegations that have timed out and been recalled,
but haven't yet been freed by FREE_STATEID.

Signed-off-by: default avatarJ. Bruce Fields <bfields@redhat.com>
parent 23340032

fs/nfsd/nfs4state.c

+47 −8
Original line number Diff line number Diff line
@@ -445,7 +445,6 @@ static void unhash_stid(struct nfs4_stid *s) 
static void

unhash_delegation(struct nfs4_delegation *dp)

{

	unhash_stid(&dp->dl_stid);

	list_del_init(&dp->dl_perclnt);

	spin_lock(&recall_lock);

	list_del_init(&dp->dl_perfile);
@@ -454,10 +453,37 @@ unhash_delegation(struct nfs4_delegation *dp) 
	nfs4_put_deleg_lease(dp->dl_file);

	put_nfs4_file(dp->dl_file);

	dp->dl_file = NULL;

}







static void destroy_revoked_delegation(struct nfs4_delegation *dp)

{

	list_del_init(&dp->dl_recall_lru);

	remove_stid(&dp->dl_stid);

	nfs4_put_delegation(dp);

}



static void destroy_delegation(struct nfs4_delegation *dp)

{

	unhash_delegation(dp);

	remove_stid(&dp->dl_stid);

	nfs4_put_delegation(dp);

}



static void revoke_delegation(struct nfs4_delegation *dp)

{

	struct nfs4_client *clp = dp->dl_stid.sc_client;



	if (clp->cl_minorversion == 0)

		destroy_delegation(dp);

	else {

		unhash_delegation(dp);

		dp->dl_stid.sc_type = NFS4_REVOKED_DELEG_STID;

		list_add(&dp->dl_recall_lru, &clp->cl_revoked);

	}

}



/* 

 * SETCLIENTID state 

 */
@@ -1114,7 +1140,7 @@ destroy_client(struct nfs4_client *clp) 
	spin_unlock(&recall_lock);

	while (!list_empty(&reaplist)) {

		dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);

		unhash_delegation(dp);

		destroy_delegation(dp);

	}

	while (!list_empty(&clp->cl_openowners)) {

		oo = list_entry(clp->cl_openowners.next, struct nfs4_openowner, oo_perclient);
@@ -1310,6 +1336,7 @@ static struct nfs4_client *create_client(struct xdr_netobj name, 
	INIT_LIST_HEAD(&clp->cl_delegations);

	INIT_LIST_HEAD(&clp->cl_lru);

	INIT_LIST_HEAD(&clp->cl_callbacks);

	INIT_LIST_HEAD(&clp->cl_revoked);

	spin_lock_init(&clp->cl_lock);

	nfsd4_init_callback(&clp->cl_cb_null);

	clp->cl_time = get_seconds();
@@ -2171,6 +2198,8 @@ out: 
	default:

		seq->status_flags = 0;

	}

	if (!list_empty(&clp->cl_revoked))

		seq->status_flags |= SEQ4_STATUS_RECALLABLE_STATE_REVOKED;

out_no_session:

	kfree(conn);

	spin_unlock(&nn->client_lock);
@@ -3297,7 +3326,7 @@ nfs4_laundromat(struct nfsd_net *nn) 
	spin_unlock(&recall_lock);

	list_for_each_safe(pos, next, &reaplist) {

		dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);

		unhash_delegation(dp);

		revoke_delegation(dp);

	}

	test_val = nn->nfsd4_lease;

	list_for_each_safe(pos, next, &nn->close_lru) {
@@ -3459,6 +3488,8 @@ static __be32 nfsd4_validate_stateid(struct nfs4_client *cl, stateid_t *stateid) 
	switch (s->sc_type) {

	case NFS4_DELEG_STID:

		return nfs_ok;

	case NFS4_REVOKED_DELEG_STID:

		return nfserr_deleg_revoked;

	case NFS4_OPEN_STID:

	case NFS4_LOCK_STID:

		ols = openlockstateid(s);
@@ -3602,6 +3633,7 @@ nfsd4_free_stateid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, 
{

	stateid_t *stateid = &free_stateid->fr_stateid;

	struct nfs4_stid *s;

	struct nfs4_delegation *dp;

	struct nfs4_client *cl = cstate->session->se_client;

	__be32 ret = nfserr_bad_stateid;
@@ -3623,6 +3655,11 @@ nfsd4_free_stateid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, 
		else

			ret = nfserr_locks_held;

		break;

	case NFS4_REVOKED_DELEG_STID:

		dp = delegstateid(s);

		destroy_revoked_delegation(dp);

		ret = nfs_ok;

		break;

	default:

		ret = nfserr_bad_stateid;

	}
@@ -3647,10 +3684,12 @@ static __be32 nfs4_seqid_op_checks(struct nfsd4_compound_state *cstate, stateid_ 
	status = nfsd4_check_seqid(cstate, sop, seqid);

	if (status)

		return status;

	if (stp->st_stid.sc_type == NFS4_CLOSED_STID)

	if (stp->st_stid.sc_type == NFS4_CLOSED_STID

		|| stp->st_stid.sc_type == NFS4_REVOKED_DELEG_STID)

		/*

		 * "Closed" stateid's exist *only* to return

		 * nfserr_replay_me from the previous step.

		 * nfserr_replay_me from the previous step, and

		 * revoked delegations are kept only for free_stateid.

		 */

		return nfserr_bad_stateid;

	status = check_stateid_generation(stateid, &stp->st_stid.sc_stateid, nfsd4_has_session(cstate));
@@ -3913,7 +3952,7 @@ nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, 
	if (status)

		goto out;



	unhash_delegation(dp);

	destroy_delegation(dp);

out:

	nfs4_unlock_state();
@@ -4763,7 +4802,7 @@ u64 nfsd_forget_client_delegations(struct nfs4_client *clp, u64 max) 
	spin_unlock(&recall_lock);



	list_for_each_entry_safe(dp, next, &victims, dl_recall_lru)

		unhash_delegation(dp);

		revoke_delegation(dp);



	return count;

}
@@ -5018,7 +5057,7 @@ nfs4_state_shutdown_net(struct net *net) 
	spin_unlock(&recall_lock);

	list_for_each_safe(pos, next, &reaplist) {

		dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);

		unhash_delegation(dp);

		destroy_delegation(dp);

	}



	nfsd4_client_tracking_exit(net);

fs/nfsd/state.h

+3 −0
Original line number Diff line number Diff line
@@ -79,6 +79,8 @@ struct nfs4_stid { 
#define NFS4_DELEG_STID 4

/* For an open stateid kept around *only* to process close replays: */

#define NFS4_CLOSED_STID 8

/* For a deleg stateid kept around only to process free_stateid's: */

#define NFS4_REVOKED_DELEG_STID 16

	unsigned char sc_type;

	stateid_t sc_stateid;

	struct nfs4_client *sc_client;
@@ -238,6 +240,7 @@ struct nfs4_client { 
	struct list_head	cl_openowners;

	struct idr		cl_stateids;	/* stateid lookup */

	struct list_head	cl_delegations;

	struct list_head	cl_revoked;	/* unacknowledged, revoked 4.1 state */

	struct list_head        cl_lru;         /* tail queue */

	struct xdr_netobj	cl_name; 	/* id generated by client */

	nfs4_verifier		cl_verifier; 	/* generated by client */

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