/*
 * GPL HEADER START
 *
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 only,
 * as published by the Free Software Foundation.
 *
 * This program 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 version 2 for more details (a copy is included
 * in the LICENSE file that accompanied this code).
 *
 * You should have received a copy of the GNU General Public License
 * version 2 along with this program; If not, see
 * http://www.gnu.org/licenses/gpl-2.0.html
 *
 * GPL HEADER END
 */
/*
 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
 * Use is subject to license terms.
 *
 * Copyright (c) 2012, 2015, Intel Corporation.
 */
/*
 * This file is part of Lustre, http://www.lustre.org/
 * Lustre is a trademark of Sun Microsystems, Inc.
 */

#define DEBUG_SUBSYSTEM S_LOV

#include <libcfs/libcfs.h>

#include <obd_class.h>
#include "lov_internal.h"

/** Merge the lock value block(&lvb) attributes and KMS from each of the
 * stripes in a file into a single lvb. It is expected that the caller
 * initializes the current atime, mtime, ctime to avoid regressing a more
 * uptodate time on the local client.
 */
int lov_merge_lvb_kms(struct lov_stripe_md *lsm,
                      struct ost_lvb *lvb, __u64 *kms_place)
{
	u64 size = 0;
	u64 kms = 0;
	u64 blocks = 0;
	s64 current_mtime = lvb->lvb_mtime;
	s64 current_atime = lvb->lvb_atime;
	s64 current_ctime = lvb->lvb_ctime;
	int i;
	int rc = 0;

	assert_spin_locked(&lsm->lsm_lock);
	LASSERT(lsm->lsm_lock_owner == current_pid());

	CDEBUG(D_INODE, "MDT ID "DOSTID" initial value: s=%llu m=%llu"
	       " a=%llu c=%llu b=%llu\n", POSTID(&lsm->lsm_oi),
	       lvb->lvb_size, lvb->lvb_mtime, lvb->lvb_atime, lvb->lvb_ctime,
	       lvb->lvb_blocks);
	for (i = 0; i < lsm->lsm_stripe_count; i++) {
		struct lov_oinfo *loi = lsm->lsm_oinfo[i];
		u64 lov_size;
		u64 tmpsize;

                if (OST_LVB_IS_ERR(loi->loi_lvb.lvb_blocks)) {
                        rc = OST_LVB_GET_ERR(loi->loi_lvb.lvb_blocks);
                        continue;
                }

                tmpsize = loi->loi_kms;
                lov_size = lov_stripe_size(lsm, tmpsize, i);
                if (lov_size > kms)
                        kms = lov_size;

                if (loi->loi_lvb.lvb_size > tmpsize)
                        tmpsize = loi->loi_lvb.lvb_size;

                lov_size = lov_stripe_size(lsm, tmpsize, i);
                if (lov_size > size)
                        size = lov_size;
                /* merge blocks, mtime, atime */
                blocks += loi->loi_lvb.lvb_blocks;
                if (loi->loi_lvb.lvb_mtime > current_mtime)
                        current_mtime = loi->loi_lvb.lvb_mtime;
                if (loi->loi_lvb.lvb_atime > current_atime)
                        current_atime = loi->loi_lvb.lvb_atime;
                if (loi->loi_lvb.lvb_ctime > current_ctime)
                        current_ctime = loi->loi_lvb.lvb_ctime;

		CDEBUG(D_INODE, "MDT ID "DOSTID" on OST[%u]: s=%llu m=%llu"
		       " a=%llu c=%llu b=%llu\n", POSTID(&lsm->lsm_oi),
		       loi->loi_ost_idx, loi->loi_lvb.lvb_size,
		       loi->loi_lvb.lvb_mtime, loi->loi_lvb.lvb_atime,
		       loi->loi_lvb.lvb_ctime, loi->loi_lvb.lvb_blocks);
        }

        *kms_place = kms;
        lvb->lvb_size = size;
        lvb->lvb_blocks = blocks;
        lvb->lvb_mtime = current_mtime;
        lvb->lvb_atime = current_atime;
        lvb->lvb_ctime = current_ctime;
        RETURN(rc);
}