[PATCH] NFS: Kill annoying mount version mismatch printks

 Ensure that we fix up the missing fields in the nfs_mount_data with
 sane defaults for older versions of mount, and return errors in the
 cases where we cannot.

 Convert a bunch of annoying warnings into dprintks()

 Return -EPROTONOSUPPORT rather than EIO if mount() tries to set NFSv3
 without it actually being compiled in.

 Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c
index ea78496..32ddcf6 100644 (file)
--- a/fs/nfs/inode.c
+++ b/fs/nfs/inode.c
@@ -366,13 +366,15 @@ nfs_create_client(struct nfs_server *server, const struct nfs_mount_data *data)
        xprt = xprt_create_proto(tcp ? IPPROTO_TCP : IPPROTO_UDP,
                                 &server->addr, &timeparms);
        if (IS_ERR(xprt)) {
-               printk(KERN_WARNING "NFS: cannot create RPC transport.\n");
+               dprintk("%s: cannot create RPC transport. Error = %ld\n",
+                               __FUNCTION__, PTR_ERR(xprt));
                return (struct rpc_clnt *)xprt;
        }
        clnt = rpc_create_client(xprt, server->hostname, &nfs_program,
                                 server->rpc_ops->version, data->pseudoflavor);
        if (IS_ERR(clnt)) {
-               printk(KERN_WARNING "NFS: cannot create RPC client.\n");
+               dprintk("%s: cannot create RPC client. Error = %ld\n",
+                               __FUNCTION__, PTR_ERR(xprt));
                goto out_fail;
        }
 
@@ -426,21 +428,16 @@ nfs_fill_super(struct super_block *sb, struct nfs_mount_data *data, int silent)
 
        /* Check NFS protocol revision and initialize RPC op vector
         * and file handle pool. */
-       if (server->flags & NFS_MOUNT_VER3) {
 #ifdef CONFIG_NFS_V3
+       if (server->flags & NFS_MOUNT_VER3) {
                server->rpc_ops = &nfs_v3_clientops;
                server->caps |= NFS_CAP_READDIRPLUS;
-               if (data->version < 4) {
-                       printk(KERN_NOTICE "NFS: NFSv3 not supported by mount program.\n");
-                       return -EIO;
-               }
-#else
-               printk(KERN_NOTICE "NFS: NFSv3 not supported.\n");
-               return -EIO;
-#endif
        } else {
                server->rpc_ops = &nfs_v2_clientops;
        }
+#else
+       server->rpc_ops = &nfs_v2_clientops;
+#endif
 
        /* Fill in pseudoflavor for mount version < 5 */
        if (!(data->flags & NFS_MOUNT_SECFLAVOUR))
@@ -1384,74 +1381,94 @@ static struct super_block *nfs_get_sb(struct file_system_type *fs_type,
        int flags, const char *dev_name, void *raw_data)
 {
        int error;
-       struct nfs_server *server;
+       struct nfs_server *server = NULL;
        struct super_block *s;
        struct nfs_fh *root;
        struct nfs_mount_data *data = raw_data;
 
-       if (!data) {
-               printk("nfs_read_super: missing data argument\n");
-               return ERR_PTR(-EINVAL);
+       s = ERR_PTR(-EINVAL);
+       if (data == NULL) {
+               dprintk("%s: missing data argument\n", __FUNCTION__);
+               goto out_err;
+       }
+       if (data->version <= 0 || data->version > NFS_MOUNT_VERSION) {
+               dprintk("%s: bad mount version\n", __FUNCTION__);
+               goto out_err;
        }
+       switch (data->version) {
+               case 1:
+                       data->namlen = 0;
+               case 2:
+                       data->bsize  = 0;
+               case 3:
+                       if (data->flags & NFS_MOUNT_VER3) {
+                               dprintk("%s: mount structure version %d does not support NFSv3\n",
+                                               __FUNCTION__,
+                                               data->version);
+                               goto out_err;
+                       }
+                       data->root.size = NFS2_FHSIZE;
+                       memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
+               case 4:
+                       if (data->flags & NFS_MOUNT_SECFLAVOUR) {
+                               dprintk("%s: mount structure version %d does not support strong security\n",
+                                               __FUNCTION__,
+                                               data->version);
+                               goto out_err;
+                       }
+               case 5:
+                       memset(data->context, 0, sizeof(data->context));
+       }
+#ifndef CONFIG_NFS_V3
+       /* If NFSv3 is not compiled in, return -EPROTONOSUPPORT */
+       s = ERR_PTR(-EPROTONOSUPPORT);
+       if (data->flags & NFS_MOUNT_VER3) {
+               dprintk("%s: NFSv3 not compiled into kernel\n", __FUNCTION__);
+               goto out_err;
+       }
+#endif /* CONFIG_NFS_V3 */
 
+       s = ERR_PTR(-ENOMEM);
        server = kmalloc(sizeof(struct nfs_server), GFP_KERNEL);
        if (!server)
-               return ERR_PTR(-ENOMEM);
+               goto out_err;
        memset(server, 0, sizeof(struct nfs_server));
        /* Zero out the NFS state stuff */
        init_nfsv4_state(server);
 
-       if (data->version != NFS_MOUNT_VERSION) {
-               printk("nfs warning: mount version %s than kernel\n",
-                       data->version < NFS_MOUNT_VERSION ? "older" : "newer");
-               if (data->version < 2)
-                       data->namlen = 0;
-               if (data->version < 3)
-                       data->bsize  = 0;
-               if (data->version < 4) {
-                       data->flags &= ~NFS_MOUNT_VER3;
-                       data->root.size = NFS2_FHSIZE;
-                       memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
-               }
-               if (data->version < 5)
-                       data->flags &= ~NFS_MOUNT_SECFLAVOUR;
-       }
-
        root = &server->fh;
        if (data->flags & NFS_MOUNT_VER3)
                root->size = data->root.size;
        else
                root->size = NFS2_FHSIZE;
+       s = ERR_PTR(-EINVAL);
        if (root->size > sizeof(root->data)) {
-               printk("nfs_get_sb: invalid root filehandle\n");
-               kfree(server);
-               return ERR_PTR(-EINVAL);
+               dprintk("%s: invalid root filehandle\n", __FUNCTION__);
+               goto out_err;
        }
        memcpy(root->data, data->root.data, root->size);
 
        /* We now require that the mount process passes the remote address */
        memcpy(&server->addr, &data->addr, sizeof(server->addr));
        if (server->addr.sin_addr.s_addr == INADDR_ANY) {
-               printk("NFS: mount program didn't pass remote address!\n");
-               kfree(server);
-               return ERR_PTR(-EINVAL);
+               dprintk("%s: mount program didn't pass remote address!\n",
+                               __FUNCTION__);
+               goto out_err;
        }
 
-       s = sget(fs_type, nfs_compare_super, nfs_set_super, server);
-
-       if (IS_ERR(s) || s->s_root) {
-               kfree(server);
-               return s;
+       /* Fire up rpciod if not yet running */
+       s = ERR_PTR(rpciod_up());
+       if (IS_ERR(s)) {
+               dprintk("%s: couldn't start rpciod! Error = %ld\n",
+                               __FUNCTION__, PTR_ERR(s));
+               goto out_err;
        }
 
-       s->s_flags = flags;
+       s = sget(fs_type, nfs_compare_super, nfs_set_super, server);
+       if (IS_ERR(s) || s->s_root)
+               goto out_rpciod_down;
 
-       /* Fire up rpciod if not yet running */
-       if (rpciod_up() != 0) {
-               printk(KERN_WARNING "NFS: couldn't start rpciod!\n");
-               kfree(server);
-               return ERR_PTR(-EIO);
-       }
+       s->s_flags = flags;
 
        error = nfs_fill_super(s, data, flags & MS_VERBOSE ? 1 : 0);
        if (error) {
@@ -1461,6 +1478,11 @@ static struct super_block *nfs_get_sb(struct file_system_type *fs_type,
        }
        s->s_flags |= MS_ACTIVE;
        return s;
+out_rpciod_down:
+       rpciod_down();
+out_err:
+       kfree(server);
+       return s;
 }
 
 static void nfs_kill_super(struct super_block *s)
@@ -1593,15 +1615,19 @@ static int nfs4_fill_super(struct super_block *sb, struct nfs4_mount_data *data,
 
        clp = nfs4_get_client(&server->addr.sin_addr);
        if (!clp) {
-               printk(KERN_WARNING "NFS: failed to create NFS4 client.\n");
+               dprintk("%s: failed to create NFS4 client.\n", __FUNCTION__);
                return -EIO;
        }
 
        /* Now create transport and client */
        authflavour = RPC_AUTH_UNIX;
        if (data->auth_flavourlen != 0) {
-               if (data->auth_flavourlen > 1)
-                       printk(KERN_INFO "NFS: cannot yet deal with multiple auth flavours.\n");
+               if (data->auth_flavourlen != 1) {
+                       dprintk("%s: Invalid number of RPC auth flavours %d.\n",
+                                       __FUNCTION__, data->auth_flavourlen);
+                       err = -EINVAL;
+                       goto out_fail;
+               }
                if (copy_from_user(&authflavour, data->auth_flavours, sizeof(authflavour))) {
                        err = -EFAULT;
                        goto out_fail;
@@ -1613,16 +1639,18 @@ static int nfs4_fill_super(struct super_block *sb, struct nfs4_mount_data *data,
                xprt = xprt_create_proto(proto, &server->addr, &timeparms);
                if (IS_ERR(xprt)) {
                        up_write(&clp->cl_sem);
-                       printk(KERN_WARNING "NFS: cannot create RPC transport.\n");
                        err = PTR_ERR(xprt);
+                       dprintk("%s: cannot create RPC transport. Error = %d\n",
+                                       __FUNCTION__, err);
                        goto out_fail;
                }
                clnt = rpc_create_client(xprt, server->hostname, &nfs_program,
                                server->rpc_ops->version, authflavour);
                if (IS_ERR(clnt)) {
                        up_write(&clp->cl_sem);
-                       printk(KERN_WARNING "NFS: cannot create RPC client.\n");
                        err = PTR_ERR(clnt);
+                       dprintk("%s: cannot create RPC client. Error = %d\n",
+                                       __FUNCTION__, err);
                        goto out_fail;
                }
                clnt->cl_intr     = 1;
@@ -1654,20 +1682,22 @@ static int nfs4_fill_super(struct super_block *sb, struct nfs4_mount_data *data,
        clp = NULL;
 
        if (IS_ERR(clnt)) {
-               printk(KERN_WARNING "NFS: cannot create RPC client.\n");
-               return PTR_ERR(clnt);
+               err = PTR_ERR(clnt);
+               dprintk("%s: cannot create RPC client. Error = %d\n",
+                               __FUNCTION__, err);
+               return err;
        }
 
        server->client    = clnt;
 
        if (server->nfs4_state->cl_idmap == NULL) {
-               printk(KERN_WARNING "NFS: failed to create idmapper.\n");
+               dprintk("%s: failed to create idmapper.\n", __FUNCTION__);
                return -ENOMEM;
        }
 
        if (clnt->cl_auth->au_flavor != authflavour) {
                if (rpcauth_create(authflavour, clnt) == NULL) {
-                       printk(KERN_WARNING "NFS: couldn't create credcache!\n");
+                       dprintk("%s: couldn't create credcache!\n", __FUNCTION__);
                        return -ENOMEM;
                }
        }
@@ -1728,8 +1758,12 @@ static struct super_block *nfs4_get_sb(struct file_system_type *fs_type,
        struct nfs4_mount_data *data = raw_data;
        void *p;
 
-       if (!data) {
-               printk("nfs_read_super: missing data argument\n");
+       if (data == NULL) {
+               dprintk("%s: missing data argument\n", __FUNCTION__);
+               return ERR_PTR(-EINVAL);
+       }
+       if (data->version <= 0 || data->version > NFS4_MOUNT_VERSION) {
+               dprintk("%s: bad mount version\n", __FUNCTION__);
                return ERR_PTR(-EINVAL);
        }
 
@@ -1740,11 +1774,6 @@ static struct super_block *nfs4_get_sb(struct file_system_type *fs_type,
        /* Zero out the NFS state stuff */
        init_nfsv4_state(server);
 
-       if (data->version != NFS4_MOUNT_VERSION) {
-               printk("nfs warning: mount version %s than kernel\n",
-                       data->version < NFS4_MOUNT_VERSION ? "older" : "newer");
-       }
-
        p = nfs_copy_user_string(NULL, &data->hostname, 256);
        if (IS_ERR(p))
                goto out_err;
@@ -1771,11 +1800,20 @@ static struct super_block *nfs4_get_sb(struct file_system_type *fs_type,
        }
        if (server->addr.sin_family != AF_INET ||
            server->addr.sin_addr.s_addr == INADDR_ANY) {
-               printk("NFS: mount program didn't pass remote IP address!\n");
+               dprintk("%s: mount program didn't pass remote IP address!\n",
+                               __FUNCTION__);
                s = ERR_PTR(-EINVAL);
                goto out_free;
        }
 
+       /* Fire up rpciod if not yet running */
+       s = ERR_PTR(rpciod_up());
+       if (IS_ERR(s)) {
+               dprintk("%s: couldn't start rpciod! Error = %ld\n",
+                               __FUNCTION__, PTR_ERR(s));
+               goto out_free;
+       }
+
        s = sget(fs_type, nfs4_compare_super, nfs_set_super, server);
 
        if (IS_ERR(s) || s->s_root)
@@ -1783,13 +1821,6 @@ static struct super_block *nfs4_get_sb(struct file_system_type *fs_type,
 
        s->s_flags = flags;
 
-       /* Fire up rpciod if not yet running */
-       if (rpciod_up() != 0) {
-               printk(KERN_WARNING "NFS: couldn't start rpciod!\n");
-               s = ERR_PTR(-EIO);
-               goto out_free;
-       }
-
        error = nfs4_fill_super(s, data, flags & MS_VERBOSE ? 1 : 0);
        if (error) {
                up_write(&s->s_umount);