Commit 1b1a9b31 authored by J. Bruce Fields's avatar J. Bruce Fields
Browse files

knfsd: don't shutdown callbacks until nfsv4 client is freed 



If a callback still holds a reference on the client, then it may be
about to perform an rpc call, so it isn't safe to call rpc_shutdown().
(Though rpc_shutdown() does wait for any outstanding rpc's, it can't
know if a new rpc is about to be issued with that client.)

So, wait to shutdown the rpc_client until the reference count on the
client has gone to zero.

Signed-off-by: default avatarJ. Bruce Fields <bfields@citi.umich.edu>
parent 0272e1fd

fs/nfsd/nfs4state.c

+13 −14
Original line number Diff line number Diff line
@@ -358,9 +358,22 @@ alloc_client(struct xdr_netobj name) 
	return clp;

}



static void

shutdown_callback_client(struct nfs4_client *clp)

{

	struct rpc_clnt *clnt = clp->cl_callback.cb_client;



	/* shutdown rpc client, ending any outstanding recall rpcs */

	if (clnt) {

		clp->cl_callback.cb_client = NULL;

		rpc_shutdown_client(clnt);

	}

}



static inline void

free_client(struct nfs4_client *clp)

{

	shutdown_callback_client(clp);

	if (clp->cl_cred.cr_group_info)

		put_group_info(clp->cl_cred.cr_group_info);

	kfree(clp->cl_name.data);
@@ -374,18 +387,6 @@ put_nfs4_client(struct nfs4_client *clp) 
		free_client(clp);

}



static void

shutdown_callback_client(struct nfs4_client *clp)

{

	struct rpc_clnt *clnt = clp->cl_callback.cb_client;



	/* shutdown rpc client, ending any outstanding recall rpcs */

	if (clnt) {

		clp->cl_callback.cb_client = NULL;

		rpc_shutdown_client(clnt);

	}

}



static void

expire_client(struct nfs4_client *clp)

{
@@ -396,8 +397,6 @@ expire_client(struct nfs4_client *clp) 
	dprintk("NFSD: expire_client cl_count %d\n",

	                    atomic_read(&clp->cl_count));



	shutdown_callback_client(clp);



	INIT_LIST_HEAD(&reaplist);

	spin_lock(&recall_lock);

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

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