fs/nfs/nfs4getroot.c

   1 /*
   2 * Copyright (C) 2006 Red Hat, Inc. All Rights Reserved.
   3 * Written by David Howells (dhowells@redhat.com)
   4 */
   5
   6 #include <linux/nfs_fs.h>
   7 #include "nfs4_fs.h"
   8 #include "internal.h"
   9
  10 #define NFSDBG_FACILITY         NFSDBG_CLIENT
  11
  12 int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh, bool auth_probe)
  13 {
  14         struct nfs_fsinfo fsinfo;
  15         int ret = -ENOMEM;
  16
  17         fsinfo.fattr = nfs_alloc_fattr();
  18         if (fsinfo.fattr == NULL)
  19                 goto out;
  20
  21         /* Start by getting the root filehandle from the server */
  22         ret = nfs4_proc_get_rootfh(server, mntfh, &fsinfo, auth_probe);
  23         if (ret < 0) {
  24                 dprintk("nfs4_get_rootfh: getroot error = %d\n", -ret);
  25                 goto out;
  26         }
  27
  28         if (!(fsinfo.fattr->valid & NFS_ATTR_FATTR_TYPE)
  29                         || !S_ISDIR(fsinfo.fattr->mode)) {
  30                 printk(KERN_ERR "nfs4_get_rootfh:"
  31                        " getroot encountered non-directory\n");
  32                 ret = -ENOTDIR;
  33                 goto out;
  34         }
  35
  36         memcpy(&server->fsid, &fsinfo.fattr->fsid, sizeof(server->fsid));
  37 out:
  38         nfs_free_fattr(fsinfo.fattr);
  39         return ret;
  40 }