text: /*
   * 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.sun.com/software/products/lustre/docs/GPLv2.pdf
   *
   * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
   * CA 95054 USA or visit www.sun.com if you need additional information or
   * have any questions.
   *
   * GPL HEADER END
   */
  /*
   * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
   * Use is subject to license terms.
   *
   * Copyright (c) 2012, 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 "../../include/linux/libcfs/libcfs.h"
  
  #include "../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, 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;
  }
  
  /* Must be called under the lov_stripe_lock() */
  int lov_adjust_kms(struct obd_export *exp, struct lov_stripe_md *lsm,
  		   u64 size, int shrink)
  {
  	struct lov_oinfo *loi;
  	int stripe = 0;
  	__u64 kms;
  
  	assert_spin_locked(&lsm->lsm_lock);
  	LASSERT(lsm->lsm_lock_owner == current_pid());
  
  	if (shrink) {
  		for (; stripe < lsm->lsm_stripe_count; stripe++) {
  			struct lov_oinfo *loi = lsm->lsm_oinfo[stripe];
  			kms = lov_size_to_stripe(lsm, size, stripe);
  			CDEBUG(D_INODE,
  			       "stripe %d KMS %sing %llu->%llu\n",
  			       stripe, kms > loi->loi_kms ? "increase":"shrink",
  			       loi->loi_kms, kms);
  			loi_kms_set(loi, loi->loi_lvb.lvb_size = kms);
  		}
  		return 0;
  	}
  
  	if (size > 0)
  		stripe = lov_stripe_number(lsm, size - 1);
  	kms = lov_size_to_stripe(lsm, size, stripe);
  	loi = lsm->lsm_oinfo[stripe];
  
  	CDEBUG(D_INODE, "stripe %d KMS %sincreasing %llu->%llu\n",
  	       stripe, kms > loi->loi_kms ? "" : "not ", loi->loi_kms, kms);
  	if (kms > loi->loi_kms)
  		loi_kms_set(loi, kms);
  
  	return 0;
  }
  
  void lov_merge_attrs(struct obdo *tgt, struct obdo *src, u64 valid,
  		     struct lov_stripe_md *lsm, int stripeno, int *set)
  {
  	valid &= src->o_valid;
  
  	if (*set) {
  		if (valid & OBD_MD_FLSIZE) {
  			/* this handles sparse files properly */
  			u64 lov_size;
  
  			lov_size = lov_stripe_size(lsm, src->o_size, stripeno);
  			if (lov_size > tgt->o_size)
  				tgt->o_size = lov_size;
  		}
  		if (valid & OBD_MD_FLBLOCKS)
  			tgt->o_blocks += src->o_blocks;
  		if (valid & OBD_MD_FLBLKSZ)
  			tgt->o_blksize += src->o_blksize;
  		if (valid & OBD_MD_FLCTIME && tgt->o_ctime < src->o_ctime)
  			tgt->o_ctime = src->o_ctime;
  		if (valid & OBD_MD_FLMTIME && tgt->o_mtime < src->o_mtime)
  			tgt->o_mtime = src->o_mtime;
  		if (valid & OBD_MD_FLDATAVERSION)
  			tgt->o_data_version += src->o_data_version;
  	} else {
  		memcpy(tgt, src, sizeof(*tgt));
  		tgt->o_oi = lsm->lsm_oi;
  		if (valid & OBD_MD_FLSIZE)
  			tgt->o_size = lov_stripe_size(lsm, src->o_size,
  						      stripeno);
  	}
  
  	/* data_version needs to be valid on all stripes to be correct! */
  	if (!(valid & OBD_MD_FLDATAVERSION))
  		tgt->o_valid &= ~OBD_MD_FLDATAVERSION;
  
  	*set += 1;
  }
  