Commit 95da1b3a authored by Andrew Elble's avatar Andrew Elble Committed by J. Bruce Fields
Browse files

nfsd: deal with revoked delegations appropriately 



If a delegation has been revoked by the server, operations using that
delegation should error out with NFS4ERR_DELEG_REVOKED in the >4.1
case, and NFS4ERR_BAD_STATEID otherwise.

The server needs NFSv4.1 clients to explicitly free revoked delegations.
If the server returns NFS4ERR_DELEG_REVOKED, the client will do that;
otherwise it may just forget about the delegation and be unable to
recover when it later sees SEQ4_STATUS_RECALLABLE_STATE_REVOKED set on a
SEQUENCE reply.  That can cause the Linux 4.1 client to loop in its
stage manager.

Signed-off-by: default avatarAndrew Elble <aweits@rit.edu>
Reviewed-by: default avatarTrond Myklebust <trond.myklebust@primarydata.com>
Cc: stable@vger.kernel.org
Signed-off-by: default avatarJ. Bruce Fields <bfields@redhat.com>
parent 77a08867

fs/nfsd/nfs4state.c

+24 −1
Original line number Diff line number Diff line
@@ -4016,7 +4016,8 @@ static struct nfs4_delegation *find_deleg_stateid(struct nfs4_client *cl, statei 
{

	struct nfs4_stid *ret;



	ret = find_stateid_by_type(cl, s, NFS4_DELEG_STID);

	ret = find_stateid_by_type(cl, s,

				NFS4_DELEG_STID|NFS4_REVOKED_DELEG_STID);

	if (!ret)

		return NULL;

	return delegstateid(ret);
@@ -4039,6 +4040,12 @@ 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_type == NFS4_REVOKED_DELEG_STID) {

		nfs4_put_stid(&deleg->dl_stid);

		if (cl->cl_minorversion)

			status = nfserr_deleg_revoked;

		goto out;

	}

	flags = share_access_to_flags(open->op_share_access);

	status = nfs4_check_delegmode(deleg, flags);

	if (status) {
@@ -4908,6 +4915,16 @@ nfsd4_lookup_stateid(struct nfsd4_compound_state *cstate, 
		     struct nfs4_stid **s, struct nfsd_net *nn)

{

	__be32 status;

	bool return_revoked = false;



	/*

	 *  only return revoked delegations if explicitly asked.

	 *  otherwise we report revoked or bad_stateid status.

	 */

	if (typemask & NFS4_REVOKED_DELEG_STID)

		return_revoked = true;

	else if (typemask & NFS4_DELEG_STID)

		typemask |= NFS4_REVOKED_DELEG_STID;



	if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))

		return nfserr_bad_stateid;
@@ -4922,6 +4939,12 @@ nfsd4_lookup_stateid(struct nfsd4_compound_state *cstate, 
	*s = find_stateid_by_type(cstate->clp, stateid, typemask);

	if (!*s)

		return nfserr_bad_stateid;

	if (((*s)->sc_type == NFS4_REVOKED_DELEG_STID) && !return_revoked) {

		nfs4_put_stid(*s);

		if (cstate->minorversion)

			return nfserr_deleg_revoked;

		return nfserr_bad_stateid;

	}

	return nfs_ok;

}

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