drivers/staging/lustre/lustre/lov/lov_ea.c - manifest_repos/valens - Git at Google

 /*
  * 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) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
  * Use is subject to license terms.
  *
  * Copyright (c) 2011, 2015, Intel Corporation.
  */
 /*
  * This file is part of Lustre, http://www.lustre.org/
  * Lustre is a trademark of Sun Microsystems, Inc.
  *
  * lustre/lov/lov_ea.c
  *
  * Author: Wang Di <wangdi@clusterfs.com>
  */

 #define DEBUG_SUBSYSTEM S_LOV

 #include <asm/div64.h>
 #include <linux/libcfs/libcfs.h>

 #include <obd_class.h>
 #include <uapi/linux/lustre/lustre_idl.h>

 #include "lov_internal.h"

 static int lsm_lmm_verify_common(struct lov_mds_md *lmm, int lmm_bytes,
 				 __u16 stripe_count)
 {
 	if (stripe_count > LOV_V1_INSANE_STRIPE_COUNT) {
 		CERROR("bad stripe count %d\n", stripe_count);
 		lov_dump_lmm_common(D_WARNING, lmm);
 		return -EINVAL;
 	}

 	if (lmm_oi_id(&lmm->lmm_oi) == 0) {
 		CERROR("zero object id\n");
 		lov_dump_lmm_common(D_WARNING, lmm);
 		return -EINVAL;
 	}

 	if (lov_pattern(le32_to_cpu(lmm->lmm_pattern)) != LOV_PATTERN_RAID0) {
 		CERROR("bad striping pattern\n");
 		lov_dump_lmm_common(D_WARNING, lmm);
 		return -EINVAL;
 	}

 	if (lmm->lmm_stripe_size == 0 ||
 	    (le32_to_cpu(lmm->lmm_stripe_size) &
 	     (LOV_MIN_STRIPE_SIZE - 1)) != 0) {
 		CERROR("bad stripe size %u\n",
 		       le32_to_cpu(lmm->lmm_stripe_size));
 		lov_dump_lmm_common(D_WARNING, lmm);
 		return -EINVAL;
 	}
 	return 0;
 }

 struct lov_stripe_md *lsm_alloc_plain(u16 stripe_count)
 {
 	size_t oinfo_ptrs_size, lsm_size;
 	struct lov_stripe_md *lsm;
 	struct lov_oinfo     *loi;
 	int i;

 	LASSERT(stripe_count <= LOV_MAX_STRIPE_COUNT);

 	oinfo_ptrs_size = sizeof(struct lov_oinfo *) * stripe_count;
 	lsm_size = sizeof(*lsm) + oinfo_ptrs_size;

 	lsm = libcfs_kvzalloc(lsm_size, GFP_NOFS);
 	if (!lsm)
 		return NULL;

 	for (i = 0; i < stripe_count; i++) {
 		loi = kmem_cache_zalloc(lov_oinfo_slab, GFP_NOFS);
 		if (!loi)
 			goto err;
 		lsm->lsm_oinfo[i] = loi;
 	}
 	lsm->lsm_stripe_count = stripe_count;
 	return lsm;

 err:
 	while (--i >= 0)
 		kmem_cache_free(lov_oinfo_slab, lsm->lsm_oinfo[i]);
 	kvfree(lsm);
 	return NULL;
 }

 void lsm_free_plain(struct lov_stripe_md *lsm)
 {
 	__u16 stripe_count = lsm->lsm_stripe_count;
 	int i;

 	for (i = 0; i < stripe_count; i++)
 		kmem_cache_free(lov_oinfo_slab, lsm->lsm_oinfo[i]);
 	kvfree(lsm);
 }

 /*
  * Find minimum stripe maxbytes value.  For inactive or
  * reconnecting targets use LUSTRE_EXT3_STRIPE_MAXBYTES.
  */
 static loff_t lov_tgt_maxbytes(struct lov_tgt_desc *tgt)
 {
 	loff_t maxbytes = LUSTRE_EXT3_STRIPE_MAXBYTES;
 	struct obd_import *imp;

 	if (!tgt->ltd_active)
 		return maxbytes;

 	imp = tgt->ltd_obd->u.cli.cl_import;
 	if (!imp)
 		return maxbytes;

 	spin_lock(&imp->imp_lock);
 	if (imp->imp_state == LUSTRE_IMP_FULL &&
 	    (imp->imp_connect_data.ocd_connect_flags & OBD_CONNECT_MAXBYTES) &&
 	     imp->imp_connect_data.ocd_maxbytes > 0)
 		maxbytes = imp->imp_connect_data.ocd_maxbytes;

 	spin_unlock(&imp->imp_lock);

 	return maxbytes;
 }

 static int lsm_unpackmd_common(struct lov_obd *lov,
 			       struct lov_stripe_md *lsm,
 			       struct lov_mds_md *lmm,
 			       struct lov_ost_data_v1 *objects)
 {
 	loff_t min_stripe_maxbytes = 0;
 	unsigned int stripe_count;
 	struct lov_oinfo *loi;
 	loff_t lov_bytes;
 	unsigned int i;

 	/*
 	 * This supposes lov_mds_md_v1/v3 first fields are
 	 * are the same
 	 */
 	lmm_oi_le_to_cpu(&lsm->lsm_oi, &lmm->lmm_oi);
 	lsm->lsm_stripe_size = le32_to_cpu(lmm->lmm_stripe_size);
 	lsm->lsm_pattern = le32_to_cpu(lmm->lmm_pattern);
 	lsm->lsm_layout_gen = le16_to_cpu(lmm->lmm_layout_gen);
 	lsm->lsm_pool_name[0] = '\0';

 	stripe_count = lsm_is_released(lsm) ? 0 : lsm->lsm_stripe_count;

 	for (i = 0; i < stripe_count; i++) {
 		loi = lsm->lsm_oinfo[i];
 		ostid_le_to_cpu(&objects[i].l_ost_oi, &loi->loi_oi);
 		loi->loi_ost_idx = le32_to_cpu(objects[i].l_ost_idx);
 		loi->loi_ost_gen = le32_to_cpu(objects[i].l_ost_gen);
 		if (lov_oinfo_is_dummy(loi))
 			continue;

 		if (loi->loi_ost_idx >= lov->desc.ld_tgt_count &&
 		    !lov2obd(lov)->obd_process_conf) {
 			CERROR("%s: OST index %d more than OST count %d\n",
 			       (char *)lov->desc.ld_uuid.uuid,
 			       loi->loi_ost_idx, lov->desc.ld_tgt_count);
 			lov_dump_lmm_v1(D_WARNING, lmm);
 			return -EINVAL;
 		}

 		if (!lov->lov_tgts[loi->loi_ost_idx]) {
 			CERROR("%s: OST index %d missing\n",
 			       (char *)lov->desc.ld_uuid.uuid,
 			       loi->loi_ost_idx);
 			lov_dump_lmm_v1(D_WARNING, lmm);
 			continue;
 		}

 		lov_bytes = lov_tgt_maxbytes(lov->lov_tgts[loi->loi_ost_idx]);
 		if (min_stripe_maxbytes == 0 || lov_bytes < min_stripe_maxbytes)
 			min_stripe_maxbytes = lov_bytes;
 	}

 	if (min_stripe_maxbytes == 0)
 		min_stripe_maxbytes = LUSTRE_EXT3_STRIPE_MAXBYTES;

 	stripe_count = lsm->lsm_stripe_count ?: lov->desc.ld_tgt_count;
 	lov_bytes = min_stripe_maxbytes * stripe_count;

 	if (lov_bytes < min_stripe_maxbytes) /* handle overflow */
 		lsm->lsm_maxbytes = MAX_LFS_FILESIZE;
 	else
 		lsm->lsm_maxbytes = lov_bytes;

 	return 0;
 }

 static void
 lsm_stripe_by_index_plain(struct lov_stripe_md *lsm, int *stripeno,
 			  loff_t *lov_off, loff_t *swidth)
 {
 	if (swidth)
 		*swidth = (u64)lsm->lsm_stripe_size * lsm->lsm_stripe_count;
 }

 static void
 lsm_stripe_by_offset_plain(struct lov_stripe_md *lsm, int *stripeno,
 			   loff_t *lov_off, loff_t *swidth)
 {
 	if (swidth)
 		*swidth = (u64)lsm->lsm_stripe_size * lsm->lsm_stripe_count;
 }

 static int lsm_lmm_verify_v1(struct lov_mds_md_v1 *lmm, int lmm_bytes,
 			     __u16 *stripe_count)
 {
 	if (lmm_bytes < sizeof(*lmm)) {
 		CERROR("lov_mds_md_v1 too small: %d, need at least %d\n",
 		       lmm_bytes, (int)sizeof(*lmm));
 		return -EINVAL;
 	}

 	*stripe_count = le16_to_cpu(lmm->lmm_stripe_count);
 	if (le32_to_cpu(lmm->lmm_pattern) & LOV_PATTERN_F_RELEASED)
 		*stripe_count = 0;

 	if (lmm_bytes < lov_mds_md_size(*stripe_count, LOV_MAGIC_V1)) {
 		CERROR("LOV EA V1 too small: %d, need %d\n",
 		       lmm_bytes, lov_mds_md_size(*stripe_count, LOV_MAGIC_V1));
 		lov_dump_lmm_common(D_WARNING, lmm);
 		return -EINVAL;
 	}

 	return lsm_lmm_verify_common(lmm, lmm_bytes, *stripe_count);
 }

 static int lsm_unpackmd_v1(struct lov_obd *lov, struct lov_stripe_md *lsm,
 			   struct lov_mds_md_v1 *lmm)
 {
 	return lsm_unpackmd_common(lov, lsm, lmm, lmm->lmm_objects);
 }

 const struct lsm_operations lsm_v1_ops = {
 	.lsm_free	    = lsm_free_plain,
 	.lsm_stripe_by_index    = lsm_stripe_by_index_plain,
 	.lsm_stripe_by_offset   = lsm_stripe_by_offset_plain,
 	.lsm_lmm_verify	 = lsm_lmm_verify_v1,
 	.lsm_unpackmd	   = lsm_unpackmd_v1,
 };

 static int lsm_lmm_verify_v3(struct lov_mds_md *lmmv1, int lmm_bytes,
 			     __u16 *stripe_count)
 {
 	struct lov_mds_md_v3 *lmm;

 	lmm = (struct lov_mds_md_v3 *)lmmv1;

 	if (lmm_bytes < sizeof(*lmm)) {
 		CERROR("lov_mds_md_v3 too small: %d, need at least %d\n",
 		       lmm_bytes, (int)sizeof(*lmm));
 		return -EINVAL;
 	}

 	*stripe_count = le16_to_cpu(lmm->lmm_stripe_count);
 	if (le32_to_cpu(lmm->lmm_pattern) & LOV_PATTERN_F_RELEASED)
 		*stripe_count = 0;

 	if (lmm_bytes < lov_mds_md_size(*stripe_count, LOV_MAGIC_V3)) {
 		CERROR("LOV EA V3 too small: %d, need %d\n",
 		       lmm_bytes, lov_mds_md_size(*stripe_count, LOV_MAGIC_V3));
 		lov_dump_lmm_common(D_WARNING, lmm);
 		return -EINVAL;
 	}

 	return lsm_lmm_verify_common((struct lov_mds_md_v1 *)lmm, lmm_bytes,
 				     *stripe_count);
 }

 static int lsm_unpackmd_v3(struct lov_obd *lov, struct lov_stripe_md *lsm,
 			   struct lov_mds_md *lmm)
 {
 	struct lov_mds_md_v3 *lmm_v3 = (struct lov_mds_md_v3 *)lmm;
 	size_t cplen = 0;
 	int rc;

 	rc = lsm_unpackmd_common(lov, lsm, lmm, lmm_v3->lmm_objects);
 	if (rc)
 		return rc;

 	cplen = strlcpy(lsm->lsm_pool_name, lmm_v3->lmm_pool_name,
 			sizeof(lsm->lsm_pool_name));
 	if (cplen >= sizeof(lsm->lsm_pool_name))
 		return -E2BIG;

 	return 0;
 }

 const struct lsm_operations lsm_v3_ops = {
 	.lsm_free	    = lsm_free_plain,
 	.lsm_stripe_by_index    = lsm_stripe_by_index_plain,
 	.lsm_stripe_by_offset   = lsm_stripe_by_offset_plain,
 	.lsm_lmm_verify	 = lsm_lmm_verify_v3,
 	.lsm_unpackmd	   = lsm_unpackmd_v3,
 };

 void dump_lsm(unsigned int level, const struct lov_stripe_md *lsm)
 {
 	CDEBUG(level, "lsm %p, objid " DOSTID ", maxbytes %#llx, magic 0x%08X, stripe_size %u, stripe_count %u, refc: %d, layout_gen %u, pool [" LOV_POOLNAMEF "]\n",
 	       lsm,
 	       POSTID(&lsm->lsm_oi), lsm->lsm_maxbytes, lsm->lsm_magic,
 	       lsm->lsm_stripe_size, lsm->lsm_stripe_count,
 	       atomic_read(&lsm->lsm_refc), lsm->lsm_layout_gen,
 	       lsm->lsm_pool_name);
 }
	/*
	* 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) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
	* Use is subject to license terms.
	*
	* Copyright (c) 2011, 2015, Intel Corporation.
	*/
	/*
	* This file is part of Lustre, http://www.lustre.org/
	* Lustre is a trademark of Sun Microsystems, Inc.
	*
	* lustre/lov/lov_ea.c
	*
	* Author: Wang Di <wangdi@clusterfs.com>
	*/

	#define DEBUG_SUBSYSTEM S_LOV

	#include <asm/div64.h>
	#include <linux/libcfs/libcfs.h>

	#include <obd_class.h>
	#include <uapi/linux/lustre/lustre_idl.h>

	#include "lov_internal.h"

	static int lsm_lmm_verify_common(struct lov_mds_md *lmm, int lmm_bytes,
	__u16 stripe_count)
	{
	if (stripe_count > LOV_V1_INSANE_STRIPE_COUNT) {
	CERROR("bad stripe count %d\n", stripe_count);
	lov_dump_lmm_common(D_WARNING, lmm);
	return -EINVAL;
	}

	if (lmm_oi_id(&lmm->lmm_oi) == 0) {
	CERROR("zero object id\n");
	lov_dump_lmm_common(D_WARNING, lmm);
	return -EINVAL;
	}

	if (lov_pattern(le32_to_cpu(lmm->lmm_pattern)) != LOV_PATTERN_RAID0) {
	CERROR("bad striping pattern\n");
	lov_dump_lmm_common(D_WARNING, lmm);
	return -EINVAL;
	}

	if (lmm->lmm_stripe_size == 0 \|\|
	(le32_to_cpu(lmm->lmm_stripe_size) &
	(LOV_MIN_STRIPE_SIZE - 1)) != 0) {
	CERROR("bad stripe size %u\n",
	le32_to_cpu(lmm->lmm_stripe_size));
	lov_dump_lmm_common(D_WARNING, lmm);
	return -EINVAL;
	}
	return 0;
	}

	struct lov_stripe_md *lsm_alloc_plain(u16 stripe_count)
	{
	size_t oinfo_ptrs_size, lsm_size;
	struct lov_stripe_md *lsm;
	struct lov_oinfo *loi;
	int i;

	LASSERT(stripe_count <= LOV_MAX_STRIPE_COUNT);

	oinfo_ptrs_size = sizeof(struct lov_oinfo ) stripe_count;
	lsm_size = sizeof(*lsm) + oinfo_ptrs_size;

	lsm = libcfs_kvzalloc(lsm_size, GFP_NOFS);
	if (!lsm)
	return NULL;

	for (i = 0; i < stripe_count; i++) {
	loi = kmem_cache_zalloc(lov_oinfo_slab, GFP_NOFS);
	if (!loi)
	goto err;
	lsm->lsm_oinfo[i] = loi;
	}
	lsm->lsm_stripe_count = stripe_count;
	return lsm;

	err:
	while (--i >= 0)
	kmem_cache_free(lov_oinfo_slab, lsm->lsm_oinfo[i]);
	kvfree(lsm);
	return NULL;
	}

	void lsm_free_plain(struct lov_stripe_md *lsm)
	{
	__u16 stripe_count = lsm->lsm_stripe_count;
	int i;

	for (i = 0; i < stripe_count; i++)
	kmem_cache_free(lov_oinfo_slab, lsm->lsm_oinfo[i]);
	kvfree(lsm);
	}

	/*
	* Find minimum stripe maxbytes value. For inactive or
	* reconnecting targets use LUSTRE_EXT3_STRIPE_MAXBYTES.
	*/
	static loff_t lov_tgt_maxbytes(struct lov_tgt_desc *tgt)
	{
	loff_t maxbytes = LUSTRE_EXT3_STRIPE_MAXBYTES;
	struct obd_import *imp;

	if (!tgt->ltd_active)
	return maxbytes;

	imp = tgt->ltd_obd->u.cli.cl_import;
	if (!imp)
	return maxbytes;

	spin_lock(&imp->imp_lock);
	if (imp->imp_state == LUSTRE_IMP_FULL &&
	(imp->imp_connect_data.ocd_connect_flags & OBD_CONNECT_MAXBYTES) &&
	imp->imp_connect_data.ocd_maxbytes > 0)
	maxbytes = imp->imp_connect_data.ocd_maxbytes;

	spin_unlock(&imp->imp_lock);

	return maxbytes;
	}

	static int lsm_unpackmd_common(struct lov_obd *lov,
	struct lov_stripe_md *lsm,
	struct lov_mds_md *lmm,
	struct lov_ost_data_v1 *objects)
	{
	loff_t min_stripe_maxbytes = 0;
	unsigned int stripe_count;
	struct lov_oinfo *loi;
	loff_t lov_bytes;
	unsigned int i;

	/*
	* This supposes lov_mds_md_v1/v3 first fields are
	* are the same
	*/
	lmm_oi_le_to_cpu(&lsm->lsm_oi, &lmm->lmm_oi);
	lsm->lsm_stripe_size = le32_to_cpu(lmm->lmm_stripe_size);
	lsm->lsm_pattern = le32_to_cpu(lmm->lmm_pattern);
	lsm->lsm_layout_gen = le16_to_cpu(lmm->lmm_layout_gen);
	lsm->lsm_pool_name[0] = '\0';

	stripe_count = lsm_is_released(lsm) ? 0 : lsm->lsm_stripe_count;

	for (i = 0; i < stripe_count; i++) {
	loi = lsm->lsm_oinfo[i];
	ostid_le_to_cpu(&objects[i].l_ost_oi, &loi->loi_oi);
	loi->loi_ost_idx = le32_to_cpu(objects[i].l_ost_idx);
	loi->loi_ost_gen = le32_to_cpu(objects[i].l_ost_gen);
	if (lov_oinfo_is_dummy(loi))
	continue;

	if (loi->loi_ost_idx >= lov->desc.ld_tgt_count &&
	!lov2obd(lov)->obd_process_conf) {
	CERROR("%s: OST index %d more than OST count %d\n",
	(char *)lov->desc.ld_uuid.uuid,
	loi->loi_ost_idx, lov->desc.ld_tgt_count);
	lov_dump_lmm_v1(D_WARNING, lmm);
	return -EINVAL;
	}

	if (!lov->lov_tgts[loi->loi_ost_idx]) {
	CERROR("%s: OST index %d missing\n",
	(char *)lov->desc.ld_uuid.uuid,
	loi->loi_ost_idx);
	lov_dump_lmm_v1(D_WARNING, lmm);
	continue;
	}

	lov_bytes = lov_tgt_maxbytes(lov->lov_tgts[loi->loi_ost_idx]);
	if (min_stripe_maxbytes == 0 \|\| lov_bytes < min_stripe_maxbytes)
	min_stripe_maxbytes = lov_bytes;
	}

	if (min_stripe_maxbytes == 0)
	min_stripe_maxbytes = LUSTRE_EXT3_STRIPE_MAXBYTES;

	stripe_count = lsm->lsm_stripe_count ?: lov->desc.ld_tgt_count;
	lov_bytes = min_stripe_maxbytes * stripe_count;

	if (lov_bytes < min_stripe_maxbytes) /* handle overflow */
	lsm->lsm_maxbytes = MAX_LFS_FILESIZE;
	else
	lsm->lsm_maxbytes = lov_bytes;

	return 0;
	}

	static void
	lsm_stripe_by_index_plain(struct lov_stripe_md lsm, int stripeno,
	loff_t lov_off, loff_t swidth)
	{
	if (swidth)
	swidth = (u64)lsm->lsm_stripe_size lsm->lsm_stripe_count;
	}

	static void
	lsm_stripe_by_offset_plain(struct lov_stripe_md lsm, int stripeno,
	loff_t lov_off, loff_t swidth)
	{
	if (swidth)
	swidth = (u64)lsm->lsm_stripe_size lsm->lsm_stripe_count;
	}

	static int lsm_lmm_verify_v1(struct lov_mds_md_v1 *lmm, int lmm_bytes,
	__u16 *stripe_count)
	{
	if (lmm_bytes < sizeof(*lmm)) {
	CERROR("lov_mds_md_v1 too small: %d, need at least %d\n",
	lmm_bytes, (int)sizeof(*lmm));
	return -EINVAL;
	}

	*stripe_count = le16_to_cpu(lmm->lmm_stripe_count);
	if (le32_to_cpu(lmm->lmm_pattern) & LOV_PATTERN_F_RELEASED)
	*stripe_count = 0;

	if (lmm_bytes < lov_mds_md_size(*stripe_count, LOV_MAGIC_V1)) {
	CERROR("LOV EA V1 too small: %d, need %d\n",
	lmm_bytes, lov_mds_md_size(*stripe_count, LOV_MAGIC_V1));
	lov_dump_lmm_common(D_WARNING, lmm);
	return -EINVAL;
	}

	return lsm_lmm_verify_common(lmm, lmm_bytes, *stripe_count);
	}

	static int lsm_unpackmd_v1(struct lov_obd lov, struct lov_stripe_md lsm,
	struct lov_mds_md_v1 *lmm)
	{
	return lsm_unpackmd_common(lov, lsm, lmm, lmm->lmm_objects);
	}

	const struct lsm_operations lsm_v1_ops = {
	.lsm_free = lsm_free_plain,
	.lsm_stripe_by_index = lsm_stripe_by_index_plain,
	.lsm_stripe_by_offset = lsm_stripe_by_offset_plain,
	.lsm_lmm_verify = lsm_lmm_verify_v1,
	.lsm_unpackmd = lsm_unpackmd_v1,
	};

	static int lsm_lmm_verify_v3(struct lov_mds_md *lmmv1, int lmm_bytes,
	__u16 *stripe_count)
	{
	struct lov_mds_md_v3 *lmm;

	lmm = (struct lov_mds_md_v3 *)lmmv1;

	if (lmm_bytes < sizeof(*lmm)) {
	CERROR("lov_mds_md_v3 too small: %d, need at least %d\n",
	lmm_bytes, (int)sizeof(*lmm));
	return -EINVAL;
	}

	*stripe_count = le16_to_cpu(lmm->lmm_stripe_count);
	if (le32_to_cpu(lmm->lmm_pattern) & LOV_PATTERN_F_RELEASED)
	*stripe_count = 0;

	if (lmm_bytes < lov_mds_md_size(*stripe_count, LOV_MAGIC_V3)) {
	CERROR("LOV EA V3 too small: %d, need %d\n",
	lmm_bytes, lov_mds_md_size(*stripe_count, LOV_MAGIC_V3));
	lov_dump_lmm_common(D_WARNING, lmm);
	return -EINVAL;
	}

	return lsm_lmm_verify_common((struct lov_mds_md_v1 *)lmm, lmm_bytes,
	*stripe_count);
	}

	static int lsm_unpackmd_v3(struct lov_obd lov, struct lov_stripe_md lsm,
	struct lov_mds_md *lmm)
	{
	struct lov_mds_md_v3 lmm_v3 = (struct lov_mds_md_v3 )lmm;
	size_t cplen = 0;
	int rc;

	rc = lsm_unpackmd_common(lov, lsm, lmm, lmm_v3->lmm_objects);
	if (rc)
	return rc;

	cplen = strlcpy(lsm->lsm_pool_name, lmm_v3->lmm_pool_name,
	sizeof(lsm->lsm_pool_name));
	if (cplen >= sizeof(lsm->lsm_pool_name))
	return -E2BIG;

	return 0;
	}

	const struct lsm_operations lsm_v3_ops = {
	.lsm_free = lsm_free_plain,
	.lsm_stripe_by_index = lsm_stripe_by_index_plain,
	.lsm_stripe_by_offset = lsm_stripe_by_offset_plain,
	.lsm_lmm_verify = lsm_lmm_verify_v3,
	.lsm_unpackmd = lsm_unpackmd_v3,
	};

	void dump_lsm(unsigned int level, const struct lov_stripe_md *lsm)
	{
	CDEBUG(level, "lsm %p, objid " DOSTID ", maxbytes %#llx, magic 0x%08X, stripe_size %u, stripe_count %u, refc: %d, layout_gen %u, pool [" LOV_POOLNAMEF "]\n",
	lsm,
	POSTID(&lsm->lsm_oi), lsm->lsm_maxbytes, lsm->lsm_magic,
	lsm->lsm_stripe_size, lsm->lsm_stripe_count,
	atomic_read(&lsm->lsm_refc), lsm->lsm_layout_gen,
	lsm->lsm_pool_name);
	}