text: /*-
   * Copyright (c) 2008-2009 Linpro AS
   * All rights reserved.
   *
   * Author: Poul-Henning Kamp <phk@phk.freebsd.dk>
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   *
   * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED.  IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   *
   * Storage method for synthetic content, based on vsb.
   */
  
  #include "config.h"
  
  #include "svnid.h"
  SVNID("$Id: storage_synth.c 2 2011-03-27 07:34:59Z jwg286 $")
  
  #include <sys/types.h>
  
  #include <stdio.h>
  #include <stdlib.h>
  #include <pthread.h>
  
  #include "shmlog.h"
  #include "cache.h"
  #include "vsb.h"
  #include "stevedore.h"
  #include "hash_slinger.h"
  
  static struct lock		sms_mtx;
  
  static void
  sms_free(struct storage *sto)
  {
  
  	CHECK_OBJ_NOTNULL(sto, STORAGE_MAGIC);
  	Lck_Lock(&sms_mtx);
  	VSL_stats->sms_nobj--;
  	VSL_stats->sms_nbytes -= sto->len;
  	VSL_stats->sms_bfree += sto->len;
  	Lck_Unlock(&sms_mtx);
  	vsb_delete(sto->priv);
  	free(sto);
  }
  
  void
  SMS_Init(void)
  {
  
  	Lck_New(&sms_mtx);
  }
  
  static struct stevedore sms_stevedore = {
  	.magic	=	STEVEDORE_MAGIC,
  	.name	=	"synth",
  	.free	=	sms_free,
  };
  
  struct vsb *
  SMS_Makesynth(struct object *obj)
  {
  	struct storage *sto;
  	struct vsb *vsb;
  
  	CHECK_OBJ_NOTNULL(obj, OBJECT_MAGIC);
  	HSH_Freestore(obj);
  	obj->len = 0;
  
  	Lck_Lock(&sms_mtx);
  	VSL_stats->sms_nreq++;
  	VSL_stats->sms_nobj++;
  	Lck_Unlock(&sms_mtx);
  
  	sto = calloc(sizeof *sto, 1);
  	XXXAN(sto);
  	vsb = vsb_newauto();
  	XXXAN(vsb);
  	sto->priv = vsb;
  	sto->len = 0;
  	sto->space = 0;
  	sto->fd = -1;
  	sto->stevedore = &sms_stevedore;
  	sto->magic = STORAGE_MAGIC;
  
  	VTAILQ_INSERT_TAIL(&obj->store, sto, list);
  	return (vsb);
  }
  
  void
  SMS_Finish(struct object *obj)
  {
  	struct storage *sto;
  	struct vsb *vsb;
  
  	CHECK_OBJ_NOTNULL(obj, OBJECT_MAGIC);
  	sto = VTAILQ_FIRST(&obj->store);
  	assert(sto->stevedore == &sms_stevedore);
  	vsb = sto->priv;
  	vsb_finish(vsb);
  	AZ(vsb_overflowed(vsb));
  
  	sto->ptr = (void*)vsb_data(vsb);
  	sto->len = vsb_len(vsb);
  	sto->space = vsb_len(vsb);
  	obj->len = sto->len;
  	if (obj->len == 0)
  		obj->flags |= OBJECT_F_ZEROLEN;
  	Lck_Lock(&sms_mtx);
  	VSL_stats->sms_nbytes += sto->len;
  	VSL_stats->sms_balloc += sto->len;
  	Lck_Unlock(&sms_mtx);
  }
  