text: /*
   * CDDL HEADER START
   *
   * The contents of this file are subject to the terms of the
   * Common Development and Distribution License (the "License").
   * You may not use this file except in compliance with the License.
   *
   * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   * or http://www.opensolaris.org/os/licensing.
   * See the License for the specific language governing permissions
   * and limitations under the License.
   *
   * When distributing Covered Code, include this CDDL HEADER in each
   * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
   * If applicable, add the following below this CDDL HEADER, with the
   * fields enclosed by brackets "[]" replaced with your own identifying
   * information: Portions Copyright [yyyy] [name of copyright owner]
   *
   * CDDL HEADER END
   */
  /*
   * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
   * Copyright (c) 2013, 2017 by Delphix. All rights reserved.
   * Copyright 2016 Nexenta Systems, Inc.  All rights reserved.
   */
  
  #ifndef	_SYS_DSL_POOL_H
  #define	_SYS_DSL_POOL_H
  
  #include <sys/spa.h>
  #include <sys/txg.h>
  #include <sys/txg_impl.h>
  #include <sys/zfs_context.h>
  #include <sys/zio.h>
  #include <sys/dnode.h>
  #include <sys/ddt.h>
  #include <sys/arc.h>
  #include <sys/bpobj.h>
  #include <sys/bptree.h>
  #include <sys/rrwlock.h>
  #include <sys/dsl_synctask.h>
  #include <sys/mmp.h>
  
  #ifdef	__cplusplus
  extern "C" {
  #endif
  
  struct objset;
  struct dsl_dir;
  struct dsl_dataset;
  struct dsl_pool;
  struct dmu_tx;
  struct dsl_scan;
  struct dsl_crypto_params;
  
  extern uint64_t zfs_dirty_data_max;
  extern uint64_t zfs_dirty_data_max_max;
  extern uint64_t zfs_dirty_data_sync_pct;
  extern int zfs_dirty_data_max_percent;
  extern int zfs_delay_min_dirty_percent;
  extern uint64_t zfs_delay_scale;
  
  /* These macros are for indexing into the zfs_all_blkstats_t. */
  #define	DMU_OT_DEFERRED	DMU_OT_NONE
  #define	DMU_OT_OTHER	DMU_OT_NUMTYPES /* place holder for DMU_OT() types */
  #define	DMU_OT_TOTAL	(DMU_OT_NUMTYPES + 1)
  
  typedef struct zfs_blkstat {
  	uint64_t	zb_count;
  	uint64_t	zb_asize;
  	uint64_t	zb_lsize;
  	uint64_t	zb_psize;
  	uint64_t	zb_gangs;
  	uint64_t	zb_ditto_2_of_2_samevdev;
  	uint64_t	zb_ditto_2_of_3_samevdev;
  	uint64_t	zb_ditto_3_of_3_samevdev;
  } zfs_blkstat_t;
  
  typedef struct zfs_all_blkstats {
  	zfs_blkstat_t	zab_type[DN_MAX_LEVELS + 1][DMU_OT_TOTAL + 1];
  	kmutex_t	zab_lock;
  } zfs_all_blkstats_t;
  
  
  typedef struct dsl_pool {
  	/* Immutable */
  	spa_t *dp_spa;
  	struct objset *dp_meta_objset;
  	struct dsl_dir *dp_root_dir;
  	struct dsl_dir *dp_mos_dir;
  	struct dsl_dir *dp_free_dir;
  	struct dsl_dir *dp_leak_dir;
  	struct dsl_dataset *dp_origin_snap;
  	uint64_t dp_root_dir_obj;
  	taskq_t *dp_vnrele_taskq;
  	struct taskq *dp_unlinked_drain_taskq;
  
  	/* No lock needed - sync context only */
  	blkptr_t dp_meta_rootbp;
  	uint64_t dp_tmp_userrefs_obj;
  	bpobj_t dp_free_bpobj;
  	uint64_t dp_bptree_obj;
  	uint64_t dp_empty_bpobj;
  	bpobj_t dp_obsolete_bpobj;
  
  	struct dsl_scan *dp_scan;
  
  	/* Uses dp_lock */
  	kmutex_t dp_lock;
  	kcondvar_t dp_spaceavail_cv;
  	uint64_t dp_dirty_pertxg[TXG_SIZE];
  	uint64_t dp_dirty_total;
  	uint64_t dp_long_free_dirty_pertxg[TXG_SIZE];
  	uint64_t dp_mos_used_delta;
  	uint64_t dp_mos_compressed_delta;
  	uint64_t dp_mos_uncompressed_delta;
  
  	/*
  	 * Time of most recently scheduled (furthest in the future)
  	 * wakeup for delayed transactions.
  	 */
  	hrtime_t dp_last_wakeup;
  
  	/* Has its own locking */
  	tx_state_t dp_tx;
  	txg_list_t dp_dirty_datasets;
  	txg_list_t dp_dirty_zilogs;
  	txg_list_t dp_dirty_dirs;
  	txg_list_t dp_sync_tasks;
  	txg_list_t dp_early_sync_tasks;
  	taskq_t *dp_sync_taskq;
  	taskq_t *dp_zil_clean_taskq;
  
  	/*
  	 * Protects administrative changes (properties, namespace)
  	 *
  	 * It is only held for write in syncing context.  Therefore
  	 * syncing context does not need to ever have it for read, since
  	 * nobody else could possibly have it for write.
  	 */
  	rrwlock_t dp_config_rwlock;
  
  	zfs_all_blkstats_t *dp_blkstats;
  } dsl_pool_t;
  
  int dsl_pool_init(spa_t *spa, uint64_t txg, dsl_pool_t **dpp);
  int dsl_pool_open(dsl_pool_t *dp);
  void dsl_pool_close(dsl_pool_t *dp);
  dsl_pool_t *dsl_pool_create(spa_t *spa, nvlist_t *zplprops,
      struct dsl_crypto_params *dcp, uint64_t txg);
  void dsl_pool_sync(dsl_pool_t *dp, uint64_t txg);
  void dsl_pool_sync_done(dsl_pool_t *dp, uint64_t txg);
  int dsl_pool_sync_context(dsl_pool_t *dp);
  uint64_t dsl_pool_adjustedsize(dsl_pool_t *dp, zfs_space_check_t slop_policy);
  uint64_t dsl_pool_unreserved_space(dsl_pool_t *dp,
      zfs_space_check_t slop_policy);
  void dsl_pool_dirty_space(dsl_pool_t *dp, int64_t space, dmu_tx_t *tx);
  void dsl_pool_undirty_space(dsl_pool_t *dp, int64_t space, uint64_t txg);
  void dsl_free(dsl_pool_t *dp, uint64_t txg, const blkptr_t *bpp);
  void dsl_free_sync(zio_t *pio, dsl_pool_t *dp, uint64_t txg,
      const blkptr_t *bpp);
  void dsl_pool_create_origin(dsl_pool_t *dp, dmu_tx_t *tx);
  void dsl_pool_upgrade_clones(dsl_pool_t *dp, dmu_tx_t *tx);
  void dsl_pool_upgrade_dir_clones(dsl_pool_t *dp, dmu_tx_t *tx);
  void dsl_pool_mos_diduse_space(dsl_pool_t *dp,
      int64_t used, int64_t comp, int64_t uncomp);
  void dsl_pool_ckpoint_diduse_space(dsl_pool_t *dp,
      int64_t used, int64_t comp, int64_t uncomp);
  void dsl_pool_config_enter(dsl_pool_t *dp, void *tag);
  void dsl_pool_config_enter_prio(dsl_pool_t *dp, void *tag);
  void dsl_pool_config_exit(dsl_pool_t *dp, void *tag);
  boolean_t dsl_pool_config_held(dsl_pool_t *dp);
  boolean_t dsl_pool_config_held_writer(dsl_pool_t *dp);
  boolean_t dsl_pool_need_dirty_delay(dsl_pool_t *dp);
  
  taskq_t *dsl_pool_vnrele_taskq(dsl_pool_t *dp);
  taskq_t *dsl_pool_unlinked_drain_taskq(dsl_pool_t *dp);
  
  int dsl_pool_user_hold(dsl_pool_t *dp, uint64_t dsobj,
      const char *tag, uint64_t now, dmu_tx_t *tx);
  int dsl_pool_user_release(dsl_pool_t *dp, uint64_t dsobj,
      const char *tag, dmu_tx_t *tx);
  void dsl_pool_clean_tmp_userrefs(dsl_pool_t *dp);
  int dsl_pool_open_special_dir(dsl_pool_t *dp, const char *name, dsl_dir_t **);
  int dsl_pool_hold(const char *name, void *tag, dsl_pool_t **dp);
  void dsl_pool_rele(dsl_pool_t *dp, void *tag);
  
  void dsl_pool_create_obsolete_bpobj(dsl_pool_t *dp, dmu_tx_t *tx);
  void dsl_pool_destroy_obsolete_bpobj(dsl_pool_t *dp, dmu_tx_t *tx);
  
  #ifdef	__cplusplus
  }
  #endif
  
  #endif /* _SYS_DSL_POOL_H */
  