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         dprintk("--> nfs4_get_rootfh()\n");
  18
  19         fsinfo.fattr = nfs_alloc_fattr();
  20         if (fsinfo.fattr == NULL)
  21                 goto out;
  22
  23         /* Start by getting the root filehandle from the server */
  24         ret = nfs4_proc_get_rootfh(server, mntfh, &fsinfo, auth_probe);
  25         if (ret < 0) {
  26                 dprintk("nfs4_get_rootfh: getroot error = %d\n", -ret);
  27                 goto out;
  28         }
  29
  30         if (!(fsinfo.fattr->valid & NFS_ATTR_FATTR_TYPE)
  31                         || !S_ISDIR(fsinfo.fattr->mode)) {
  32                 printk(KERN_ERR "nfs4_get_rootfh:"
  33                        " getroot encountered non-directory\n");
  34                 ret = -ENOTDIR;
  35                 goto out;
  36         }
  37
  38         if (fsinfo.fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) {
  39                 printk(KERN_ERR "nfs4_get_rootfh:"
  40                        " getroot obtained referral\n");
  41                 ret = -EREMOTE;
  42                 goto out;
  43         }
  44
  45         memcpy(&server->fsid, &fsinfo.fattr->fsid, sizeof(server->fsid));
  46 out:
  47         nfs_free_fattr(fsinfo.fattr);
  48         dprintk("<-- nfs4_get_rootfh() = %d\n", ret);
  49         return ret;
  50 }