linux/fs/nfs/nfs4getroot.c
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   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
  12int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh)
  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);
  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));
  46out:
  47        nfs_free_fattr(fsinfo.fattr);
  48        dprintk("<-- nfs4_get_rootfh() = %d\n", ret);
  49        return ret;
  50}
  51
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