/*
 * 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 COPYING file that accompanied this code.

 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 *
 * GPL HEADER END
 */
/*
 * Copyright (c) 2013, Intel Corporation.
 */
/*
 * lustre/include/lustre_lmv.h
 *
 * Lustre LMV structures and functions.
 *
 * Author: Di Wang <di.wang@intel.com>
 */

#ifndef _LUSTRE_LMV_H
#define _LUSTRE_LMV_H
#include <lustre/lustre_idl.h>

struct lmv_oinfo {
	struct lu_fid	lmo_fid;
	mdsno_t		lmo_mds;
	struct inode	*lmo_root;
};

struct lmv_stripe_md {
	__u32	lsm_md_magic;
	__u32	lsm_md_stripe_count;
	__u32	lsm_md_master_mdt_index;
	__u32	lsm_md_hash_type;
	__u32	lsm_md_layout_version;
	__u32	lsm_md_default_count;
	__u32	lsm_md_default_index;
	struct lu_fid	lsm_md_master_fid;
	char	lsm_md_pool_name[LOV_MAXPOOLNAME];
	struct lmv_oinfo lsm_md_oinfo[0];
};

static inline bool
lsm_md_eq(const struct lmv_stripe_md *lsm1, const struct lmv_stripe_md *lsm2)
{
	int idx;

	if (lsm1->lsm_md_magic != lsm2->lsm_md_magic ||
	    lsm1->lsm_md_stripe_count != lsm2->lsm_md_stripe_count ||
	    lsm1->lsm_md_master_mdt_index !=
				lsm2->lsm_md_master_mdt_index ||
	    lsm1->lsm_md_hash_type != lsm2->lsm_md_hash_type ||
	    lsm1->lsm_md_layout_version !=
				lsm2->lsm_md_layout_version ||
	    strcmp(lsm1->lsm_md_pool_name,
		      lsm2->lsm_md_pool_name) != 0)
		return false;

	for (idx = 0; idx < lsm1->lsm_md_stripe_count; idx++) {
		if (!lu_fid_eq(&lsm1->lsm_md_oinfo[idx].lmo_fid,
			       &lsm2->lsm_md_oinfo[idx].lmo_fid))
			return false;
	}

	return true;
}
union lmv_mds_md;

int lmv_pack_md(union lmv_mds_md **lmmp, const struct lmv_stripe_md *lsm,
		       int stripe_count);
int lmv_alloc_md(union lmv_mds_md **lmmp, int stripe_count);
void lmv_free_md(union lmv_mds_md *lmm);
int lmv_alloc_memmd(struct lmv_stripe_md **lsmp, int stripe_count);
void lmv_free_memmd(struct lmv_stripe_md *lsm);

static inline void lmv1_cpu_to_le(struct lmv_mds_md_v1 *lmv_dst,
				  const struct lmv_mds_md_v1 *lmv_src)
{
	int i;

	lmv_dst->lmv_magic = cpu_to_le32(lmv_src->lmv_magic);
	lmv_dst->lmv_stripe_count = cpu_to_le32(lmv_src->lmv_stripe_count);
	lmv_dst->lmv_master_mdt_index =
			cpu_to_le32(lmv_src->lmv_master_mdt_index);
	lmv_dst->lmv_hash_type = cpu_to_le32(lmv_src->lmv_hash_type);
	lmv_dst->lmv_layout_version = cpu_to_le32(lmv_src->lmv_layout_version);
	for (i = 0; i < lmv_src->lmv_stripe_count; i++)
		fid_cpu_to_le(&lmv_dst->lmv_stripe_fids[i],
			      &lmv_src->lmv_stripe_fids[i]);
}

static inline void lmv1_le_to_cpu(struct lmv_mds_md_v1 *lmv_dst,
				  const struct lmv_mds_md_v1 *lmv_src)
{
	int i;

	lmv_dst->lmv_magic = le32_to_cpu(lmv_src->lmv_magic);
	lmv_dst->lmv_stripe_count = le32_to_cpu(lmv_src->lmv_stripe_count);
	lmv_dst->lmv_master_mdt_index =
				le32_to_cpu(lmv_src->lmv_master_mdt_index);
	lmv_dst->lmv_hash_type = le32_to_cpu(lmv_src->lmv_hash_type);
	lmv_dst->lmv_layout_version = le32_to_cpu(lmv_src->lmv_layout_version);
	for (i = 0; i < lmv_src->lmv_stripe_count; i++)
		fid_le_to_cpu(&lmv_dst->lmv_stripe_fids[i],
			      &lmv_src->lmv_stripe_fids[i]);
}

static inline void lmv_cpu_to_le(union lmv_mds_md *lmv_dst,
				 const union lmv_mds_md *lmv_src)
{
	switch (lmv_src->lmv_magic) {
	case LMV_MAGIC_V1:
		lmv1_cpu_to_le(&lmv_dst->lmv_md_v1, &lmv_src->lmv_md_v1);
		break;
	default:
		break;
	}
}

static inline void lmv_le_to_cpu(union lmv_mds_md *lmv_dst,
				 const union lmv_mds_md *lmv_src)
{
	switch (le32_to_cpu(lmv_src->lmv_magic)) {
	case LMV_MAGIC_V1:
		lmv1_le_to_cpu(&lmv_dst->lmv_md_v1, &lmv_src->lmv_md_v1);
		break;
	default:
		break;
	}
}

#endif