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Commit 13bbc06a authored by Trond Myklebust's avatar Trond Myklebust Committed by Linus Torvalds
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[PATCH] NFS: Fix NFSv4 callback regression 



The change in semantics for nfs_find_client() introduced by David breaks the
NFSv4 callback channel.

Also, replace another completely broken BUG_ON() in nfs_find_client().  In
initialised clients, clp->cl_cons_state == 0, and callers of that function
should in any case never want to see clients that are uninitialised.

Signed-off-by: default avatarTrond Myklebust <Trond.Myklebust@netapp.com>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 7d9ac06f

fs/nfs/client.c

+12 −7
Original line number Diff line number Diff line
@@ -232,11 +232,15 @@ void nfs_put_client(struct nfs_client *clp) 
 * Find a client by address

 * - caller must hold nfs_client_lock

 */

static struct nfs_client *__nfs_find_client(const struct sockaddr_in *addr, int nfsversion)

static struct nfs_client *__nfs_find_client(const struct sockaddr_in *addr, int nfsversion, int match_port)

{

	struct nfs_client *clp;



	list_for_each_entry(clp, &nfs_client_list, cl_share_link) {

		/* Don't match clients that failed to initialise properly */

		if (clp->cl_cons_state < 0)

			continue;



		/* Different NFS versions cannot share the same nfs_client */

		if (clp->cl_nfsversion != nfsversion)

			continue;
@@ -245,7 +249,7 @@ static struct nfs_client *__nfs_find_client(const struct sockaddr_in *addr, int 
			   sizeof(clp->cl_addr.sin_addr)) != 0)

			continue;



		if (clp->cl_addr.sin_port == addr->sin_port)

		if (!match_port || clp->cl_addr.sin_port == addr->sin_port)

			goto found;

	}
@@ -265,11 +269,12 @@ struct nfs_client *nfs_find_client(const struct sockaddr_in *addr, int nfsversio 
	struct nfs_client *clp;



	spin_lock(&nfs_client_lock);

	clp = __nfs_find_client(addr, nfsversion);

	clp = __nfs_find_client(addr, nfsversion, 0);

	spin_unlock(&nfs_client_lock);



	BUG_ON(clp && clp->cl_cons_state == 0);



	if (clp != NULL && clp->cl_cons_state != NFS_CS_READY) {

		nfs_put_client(clp);

		clp = NULL;

	}

	return clp;

}
@@ -292,7 +297,7 @@ static struct nfs_client *nfs_get_client(const char *hostname, 
	do {

		spin_lock(&nfs_client_lock);



		clp = __nfs_find_client(addr, nfsversion);

		clp = __nfs_find_client(addr, nfsversion, 1);

		if (clp)

			goto found_client;

		if (new)