1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Copyright (C) 2006 Red Hat, Inc. All Rights Reserved.
4*4882a593Smuzhiyun * Written by David Howells (dhowells@redhat.com)
5*4882a593Smuzhiyun */
6*4882a593Smuzhiyun
7*4882a593Smuzhiyun #include <linux/nfs_fs.h>
8*4882a593Smuzhiyun #include "nfs4_fs.h"
9*4882a593Smuzhiyun #include "internal.h"
10*4882a593Smuzhiyun
11*4882a593Smuzhiyun #define NFSDBG_FACILITY NFSDBG_CLIENT
12*4882a593Smuzhiyun
nfs4_get_rootfh(struct nfs_server * server,struct nfs_fh * mntfh,bool auth_probe)13*4882a593Smuzhiyun int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh, bool auth_probe)
14*4882a593Smuzhiyun {
15*4882a593Smuzhiyun struct nfs_fsinfo fsinfo;
16*4882a593Smuzhiyun int ret = -ENOMEM;
17*4882a593Smuzhiyun
18*4882a593Smuzhiyun fsinfo.fattr = nfs_alloc_fattr();
19*4882a593Smuzhiyun if (fsinfo.fattr == NULL)
20*4882a593Smuzhiyun goto out;
21*4882a593Smuzhiyun
22*4882a593Smuzhiyun /* Start by getting the root filehandle from the server */
23*4882a593Smuzhiyun ret = nfs4_proc_get_rootfh(server, mntfh, &fsinfo, auth_probe);
24*4882a593Smuzhiyun if (ret < 0) {
25*4882a593Smuzhiyun dprintk("nfs4_get_rootfh: getroot error = %d\n", -ret);
26*4882a593Smuzhiyun goto out;
27*4882a593Smuzhiyun }
28*4882a593Smuzhiyun
29*4882a593Smuzhiyun if (!(fsinfo.fattr->valid & NFS_ATTR_FATTR_TYPE)
30*4882a593Smuzhiyun || !S_ISDIR(fsinfo.fattr->mode)) {
31*4882a593Smuzhiyun printk(KERN_ERR "nfs4_get_rootfh:"
32*4882a593Smuzhiyun " getroot encountered non-directory\n");
33*4882a593Smuzhiyun ret = -ENOTDIR;
34*4882a593Smuzhiyun goto out;
35*4882a593Smuzhiyun }
36*4882a593Smuzhiyun
37*4882a593Smuzhiyun memcpy(&server->fsid, &fsinfo.fattr->fsid, sizeof(server->fsid));
38*4882a593Smuzhiyun out:
39*4882a593Smuzhiyun nfs_free_fattr(fsinfo.fattr);
40*4882a593Smuzhiyun return ret;
41*4882a593Smuzhiyun }
42