1 files changed, 49 insertions, 0 deletions

diff --git a/fs/nfs/nfs4getroot.c b/fs/nfs/nfs4getroot.c
new file mode 100644
index 000000000000..6a83780e0ce6
--- /dev/null
+++ b/fs/nfs/nfs4getroot.c
@@ -0,0 +1,49 @@
+/*
+* Copyright (C) 2006 Red Hat, Inc. All Rights Reserved.
+* Written by David Howells (dhowells@redhat.com)
+*/
+
+#include <linux/nfs_fs.h>
+#include "nfs4_fs.h"
+
+#define NFSDBG_FACILITY         NFSDBG_CLIENT
+
+int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh)
+{
+        struct nfs_fsinfo fsinfo;
+        int ret = -ENOMEM;
+
+        dprintk("--> nfs4_get_rootfh()\n");
+
+        fsinfo.fattr = nfs_alloc_fattr();
+        if (fsinfo.fattr == NULL)
+                goto out;
+
+        /* Start by getting the root filehandle from the server */
+        ret = nfs4_proc_get_rootfh(server, mntfh, &fsinfo);
+        if (ret < 0) {
+                dprintk("nfs4_get_rootfh: getroot error = %d\n", -ret);
+                goto out;
+        }
+
+        if (!(fsinfo.fattr->valid & NFS_ATTR_FATTR_TYPE)
+                        || !S_ISDIR(fsinfo.fattr->mode)) {
+                printk(KERN_ERR "nfs4_get_rootfh:"
+                       " getroot encountered non-directory\n");
+                ret = -ENOTDIR;
+                goto out;
+        }
+
+        if (fsinfo.fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) {
+                printk(KERN_ERR "nfs4_get_rootfh:"
+                       " getroot obtained referral\n");
+                ret = -EREMOTE;
+                goto out;
+        }
+
+        memcpy(&server->fsid, &fsinfo.fattr->fsid, sizeof(server->fsid));
+out:
+        nfs_free_fattr(fsinfo.fattr);
+        dprintk("<-- nfs4_get_rootfh() = %d\n", ret);
+        return ret;
+}