nfs4getroot.c

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/*
* Copyright (C) 2006 Red Hat, Inc. All Rights Reserved.
* Written by David Howells ([email protected])
*/

#include <linux/nfs_fs.h>
#include "nfs4_fs.h"
#include "internal.h"

#define NFSDBG_FACILITY     NFSDBG_CLIENT

int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh)
{
    struct nfs_fsinfo fsinfo;
    int ret = -ENOMEM;

    dprintk("--> nfs4_get_rootfh()\n");

    fsinfo.fattr = nfs_alloc_fattr();
    if (fsinfo.fattr == NULL)
        goto out;

    /* Start by getting the root filehandle from the server */
    ret = nfs4_proc_get_rootfh(server, mntfh, &fsinfo);
    if (ret < 0) {
        dprintk("nfs4_get_rootfh: getroot error = %d\n", -ret);
        goto out;
    }

    if (!(fsinfo.fattr->valid & NFS_ATTR_FATTR_TYPE)
            || !S_ISDIR(fsinfo.fattr->mode)) {
        printk(KERN_ERR "nfs4_get_rootfh:"
               " getroot encountered non-directory\n");
        ret = -ENOTDIR;
        goto out;
    }

    if (fsinfo.fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) {
        printk(KERN_ERR "nfs4_get_rootfh:"
               " getroot obtained referral\n");
        ret = -EREMOTE;
        goto out;
    }

    memcpy(&server->fsid, &fsinfo.fattr->fsid, sizeof(server->fsid));
out:
    nfs_free_fattr(fsinfo.fattr);
    dprintk("<-- nfs4_get_rootfh() = %d\n", ret);
    return ret;
}