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/*
  Copyright (c) 2010-2011 Gluster, Inc. <http://www.gluster.com>
  This file is part of GlusterFS.

  GlusterFS is free software; you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published
  by the Free Software Foundation; either version 3 of the License,
  or (at your option) any later version.

  GlusterFS is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program.  If not, see
  <http://www.gnu.org/licenses/>.
*/

#ifndef _CONFIG_H
#define _CONFIG_H
#include "config.h"
#endif

#include "rpcsvc.h"
#include "dict.h"
#include "xlator.h"
#include "xdr-nfs3.h"
#include "msg-nfs3.h"
#include "iobuf.h"
#include "nfs3-fh.h"
#include "nfs-common.h"
#include "iatt.h"
#include "common-utils.h"


int
nfs3_fh_validate (struct nfs3_fh *fh)
{
	if (!fh)
		return 0;

	if (fh->ident[0] != GF_NFSFH_IDENT0)
		return 0;

	if (fh->ident[1] != GF_NFSFH_IDENT1)
		return 0;

        return 1;
}


void
nfs3_fh_init (struct nfs3_fh *fh, struct iatt *buf)
{
        if ((!fh) || (!buf))
                return;

        fh->ident[0] = GF_NFSFH_IDENT0;
        fh->ident[1] = GF_NFSFH_IDENT1;

        uuid_copy (fh->gfid, buf->ia_gfid);
}


struct nfs3_fh
nfs3_fh_build_indexed_root_fh (xlator_list_t *cl, xlator_t *xl)
{
        struct nfs3_fh  fh = {{0}, };
        struct iatt     buf = {0, };
        uuid_t          root = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1};

        if ((!cl) || (!xl))
                return fh;

        uuid_copy (buf.ia_gfid, root);
        nfs3_fh_init (&fh, &buf);
        fh.exportid [15] = nfs_xlator_to_xlid (cl, xl);

        return fh;
}


struct nfs3_fh
nfs3_fh_build_uuid_root_fh (uuid_t volumeid)
{
        struct nfs3_fh  fh = {{0}, };
        struct iatt     buf = {0, };
        uuid_t          root = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1};

        uuid_copy (buf.ia_gfid, root);
        nfs3_fh_init (&fh, &buf);
        uuid_copy (fh.exportid, volumeid);

        return fh;
}


int
nfs3_fh_is_root_fh (struct nfs3_fh *fh)
{
        uuid_t  rootgfid = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1};

        if (!fh)
                return 0;

        if (uuid_compare (fh->gfid, rootgfid) == 0)
                return 1;

        return 0;
}


void
nfs3_fh_to_str (struct nfs3_fh *fh, char *str)
{
        char            gfid[512];
        char            exportid[512];

        if ((!fh) || (!str))
                return;

        sprintf (str, "FH: exportid %s, gfid %s",
                 uuid_utoa_r (fh->exportid, exportid),
                 uuid_utoa_r (fh->gfid, gfid));
}

void
nfs3_log_fh (struct nfs3_fh *fh)
{
        char    gfidstr[512];
        char    exportidstr[512];

        if (!fh)
                return;

        gf_log ("nfs3-fh", GF_LOG_TRACE, "filehandle: exportid "
                "0x%s, gfid 0x%s",
                 uuid_utoa_r (fh->exportid, exportidstr),
                 uuid_utoa_r (fh->gfid, gfidstr));
}

int
nfs3_fh_build_parent_fh (struct nfs3_fh *child, struct iatt *newstat,
                         struct nfs3_fh *newfh)
{
        if ((!child) || (!newstat) || (!newfh))
                return -1;

        nfs3_fh_init (newfh, newstat);
        uuid_copy (newfh->exportid, child->exportid);

        return 0;
}

int
nfs3_build_fh (inode_t *inode, uuid_t exportid, struct nfs3_fh *newfh)
{
        if (!newfh || !inode)
                return -1;

        newfh->ident[0] = GF_NFSFH_IDENT0;
        newfh->ident[1] = GF_NFSFH_IDENT1;
        uuid_copy (newfh->gfid, inode->gfid);
        uuid_copy (newfh->exportid, exportid);
        return 0;
}

int
nfs3_fh_build_child_fh (struct nfs3_fh *parent, struct iatt *newstat,
                        struct nfs3_fh *newfh)
{
        if ((!parent) || (!newstat) || (!newfh))
                return -1;

        nfs3_fh_init (newfh, newstat);
        uuid_copy (newfh->exportid, parent->exportid);

        return 0;
}


uint32_t
nfs3_fh_compute_size (struct nfs3_fh *fh)
{
        return GF_NFSFH_STATIC_SIZE;
}