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Commit a21bdd9b authored by Chuck Lever's avatar Chuck Lever Committed by Trond Myklebust
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NFS: Return error code from nfs_callback_up() to user space 



If the kernel cannot start the NFSv4 callback service during a mount
request, it returns -ENOMEM to user space, resulting in this message:

   mount.nfs4: Cannot allocate memory

Adjust nfs_alloc_client() and nfs_get_client() to pass NFSv4 callback
start-up errors back to user space so a less mysterious error message
can be displayed by the mount command.

Signed-off-by: default avatarChuck Lever <chuck.lever@oracle.com>
Signed-off-by: default avatarTrond Myklebust <Trond.Myklebust@netapp.com>
parent c381ad2c

fs/nfs/client.c

+8 −4
Original line number Diff line number Diff line
@@ -114,6 +114,7 @@ static struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_ 
{

	struct nfs_client *clp;

	struct rpc_cred *cred;

	int err = -ENOMEM;



	if ((clp = kzalloc(sizeof(*clp), GFP_KERNEL)) == NULL)

		goto error_0;
@@ -121,7 +122,8 @@ static struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_ 
	clp->rpc_ops = cl_init->rpc_ops;



	if (cl_init->rpc_ops->version == 4) {

		if (nfs_callback_up() < 0)

		err = nfs_callback_up();

		if (err < 0)

			goto error_2;

		__set_bit(NFS_CS_CALLBACK, &clp->cl_res_state);

	}
@@ -133,6 +135,7 @@ static struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_ 
	clp->cl_addrlen = cl_init->addrlen;



	if (cl_init->hostname) {

		err = -ENOMEM;

		clp->cl_hostname = kstrdup(cl_init->hostname, GFP_KERNEL);

		if (!clp->cl_hostname)

			goto error_3;
@@ -165,7 +168,7 @@ static struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_ 
error_2:

	kfree(clp);

error_0:

	return NULL;

	return ERR_PTR(err);

}



static void nfs4_shutdown_client(struct nfs_client *clp)
@@ -456,9 +459,10 @@ static struct nfs_client *nfs_get_client(const struct nfs_client_initdata *cl_in 
		spin_unlock(&nfs_client_lock);



		new = nfs_alloc_client(cl_init);

	} while (new);

	} while (!IS_ERR(new));



	return ERR_PTR(-ENOMEM);

	dprintk("--> nfs_get_client() = %ld [failed]\n", PTR_ERR(new));

	return new;



	/* install a new client and return with it unready */

install_client: