NFSv4: Fix lock recovery when CREATE_SESSION/SETCLIENTID_CONFIRM fails
[linux-3.10.git] / 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)
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));
46 out:
47         nfs_free_fattr(fsinfo.fattr);
48         dprintk("<-- nfs4_get_rootfh() = %d\n", ret);
49         return ret;
50 }