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
   9 #define NFSDBG_FACILITY         NFSDBG_CLIENT
  10
  11 int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh)
  12 {
  13         struct nfs_fsinfo fsinfo;
  14         int ret = -ENOMEM;
  15
  16         dprintk("--> nfs4_get_rootfh()\n");
  17
  18         fsinfo.fattr = nfs_alloc_fattr();
  19         if (fsinfo.fattr == NULL)
  20                 goto out;
  21
  22         /* Start by getting the root filehandle from the server */
  23         ret = nfs4_proc_get_rootfh(server, mntfh, &fsinfo);
  24         if (ret < 0) {
  25                 dprintk("nfs4_get_rootfh: getroot error = %d\n", -ret);
  26                 goto out;
  27         }
  28
  29         if (!(fsinfo.fattr->valid & NFS_ATTR_FATTR_TYPE)
  30                         || !S_ISDIR(fsinfo.fattr->mode)) {
  31                 printk(KERN_ERR "nfs4_get_rootfh:"
  32                        " getroot encountered non-directory\n");
  33                 ret = -ENOTDIR;
  34                 goto out;
  35         }
  36
  37         if (fsinfo.fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) {
  38                 printk(KERN_ERR "nfs4_get_rootfh:"
  39                        " getroot obtained referral\n");
  40                 ret = -EREMOTE;
  41                 goto out;
  42         }
  43
  44         memcpy(&server->fsid, &fsinfo.fattr->fsid, sizeof(server->fsid));
  45 out:
  46         nfs_free_fattr(fsinfo.fattr);
  47         dprintk("<-- nfs4_get_rootfh() = %d\n", ret);
  48         return ret;
  49 }