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diff --git a/uts/common/fs/zfs/sys/dmu_impl.h b/uts/common/fs/zfs/sys/dmu_impl.h
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+/*
+ * 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 2010 Sun Microsystems, Inc. All rights reserved.
+ * Use is subject to license terms.
+ */
+
+#ifndef _SYS_DMU_IMPL_H
+#define _SYS_DMU_IMPL_H
+
+#include <sys/txg_impl.h>
+#include <sys/zio.h>
+#include <sys/dnode.h>
+#include <sys/zfs_context.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*
+ * This is the locking strategy for the DMU. Numbers in parenthesis are
+ * cases that use that lock order, referenced below:
+ *
+ * ARC is self-contained
+ * bplist is self-contained
+ * refcount is self-contained
+ * txg is self-contained (hopefully!)
+ * zst_lock
+ * zf_rwlock
+ *
+ * XXX try to improve evicting path?
+ *
+ * dp_config_rwlock > os_obj_lock > dn_struct_rwlock >
+ * dn_dbufs_mtx > hash_mutexes > db_mtx > dd_lock > leafs
+ *
+ * dp_config_rwlock
+ * must be held before: everything
+ * protects dd namespace changes
+ * protects property changes globally
+ * held from:
+ * dsl_dir_open/r:
+ * dsl_dir_create_sync/w:
+ * dsl_dir_sync_destroy/w:
+ * dsl_dir_rename_sync/w:
+ * dsl_prop_changed_notify/r:
+ *
+ * os_obj_lock
+ * must be held before:
+ * everything except dp_config_rwlock
+ * protects os_obj_next
+ * held from:
+ * dmu_object_alloc: dn_dbufs_mtx, db_mtx, hash_mutexes, dn_struct_rwlock
+ *
+ * dn_struct_rwlock
+ * must be held before:
+ * everything except dp_config_rwlock and os_obj_lock
+ * protects structure of dnode (eg. nlevels)
+ * db_blkptr can change when syncing out change to nlevels
+ * dn_maxblkid
+ * dn_nlevels
+ * dn_*blksz*
+ * phys nlevels, maxblkid, physical blkptr_t's (?)
+ * held from:
+ * callers of dbuf_read_impl, dbuf_hold[_impl], dbuf_prefetch
+ * dmu_object_info_from_dnode: dn_dirty_mtx (dn_datablksz)
+ * dmu_tx_count_free:
+ * dbuf_read_impl: db_mtx, dmu_zfetch()
+ * dmu_zfetch: zf_rwlock/r, zst_lock, dbuf_prefetch()
+ * dbuf_new_size: db_mtx
+ * dbuf_dirty: db_mtx
+ * dbuf_findbp: (callers, phys? - the real need)
+ * dbuf_create: dn_dbufs_mtx, hash_mutexes, db_mtx (phys?)
+ * dbuf_prefetch: dn_dirty_mtx, hash_mutexes, db_mtx, dn_dbufs_mtx
+ * dbuf_hold_impl: hash_mutexes, db_mtx, dn_dbufs_mtx, dbuf_findbp()
+ * dnode_sync/w (increase_indirection): db_mtx (phys)
+ * dnode_set_blksz/w: dn_dbufs_mtx (dn_*blksz*)
+ * dnode_new_blkid/w: (dn_maxblkid)
+ * dnode_free_range/w: dn_dirty_mtx (dn_maxblkid)
+ * dnode_next_offset: (phys)
+ *
+ * dn_dbufs_mtx
+ * must be held before:
+ * db_mtx, hash_mutexes
+ * protects:
+ * dn_dbufs
+ * dn_evicted
+ * held from:
+ * dmu_evict_user: db_mtx (dn_dbufs)
+ * dbuf_free_range: db_mtx (dn_dbufs)
+ * dbuf_remove_ref: db_mtx, callees:
+ * dbuf_hash_remove: hash_mutexes, db_mtx
+ * dbuf_create: hash_mutexes, db_mtx (dn_dbufs)
+ * dnode_set_blksz: (dn_dbufs)
+ *
+ * hash_mutexes (global)
+ * must be held before:
+ * db_mtx
+ * protects dbuf_hash_table (global) and db_hash_next
+ * held from:
+ * dbuf_find: db_mtx
+ * dbuf_hash_insert: db_mtx
+ * dbuf_hash_remove: db_mtx
+ *
+ * db_mtx (meta-leaf)
+ * must be held before:
+ * dn_mtx, dn_dirty_mtx, dd_lock (leaf mutexes)
+ * protects:
+ * db_state
+ * db_holds
+ * db_buf
+ * db_changed
+ * db_data_pending
+ * db_dirtied
+ * db_link
+ * db_dirty_node (??)
+ * db_dirtycnt
+ * db_d.*
+ * db.*
+ * held from:
+ * dbuf_dirty: dn_mtx, dn_dirty_mtx
+ * dbuf_dirty->dsl_dir_willuse_space: dd_lock
+ * dbuf_dirty->dbuf_new_block->dsl_dataset_block_freeable: dd_lock
+ * dbuf_undirty: dn_dirty_mtx (db_d)
+ * dbuf_write_done: dn_dirty_mtx (db_state)
+ * dbuf_*
+ * dmu_buf_update_user: none (db_d)
+ * dmu_evict_user: none (db_d) (maybe can eliminate)
+ * dbuf_find: none (db_holds)
+ * dbuf_hash_insert: none (db_holds)
+ * dmu_buf_read_array_impl: none (db_state, db_changed)
+ * dmu_sync: none (db_dirty_node, db_d)
+ * dnode_reallocate: none (db)
+ *
+ * dn_mtx (leaf)
+ * protects:
+ * dn_dirty_dbufs
+ * dn_ranges
+ * phys accounting
+ * dn_allocated_txg
+ * dn_free_txg
+ * dn_assigned_txg
+ * dd_assigned_tx
+ * dn_notxholds
+ * dn_dirtyctx
+ * dn_dirtyctx_firstset
+ * (dn_phys copy fields?)
+ * (dn_phys contents?)
+ * held from:
+ * dnode_*
+ * dbuf_dirty: none
+ * dbuf_sync: none (phys accounting)
+ * dbuf_undirty: none (dn_ranges, dn_dirty_dbufs)
+ * dbuf_write_done: none (phys accounting)
+ * dmu_object_info_from_dnode: none (accounting)
+ * dmu_tx_commit: none
+ * dmu_tx_hold_object_impl: none
+ * dmu_tx_try_assign: dn_notxholds(cv)
+ * dmu_tx_unassign: none
+ *
+ * dd_lock
+ * must be held before:
+ * ds_lock
+ * ancestors' dd_lock
+ * protects:
+ * dd_prop_cbs
+ * dd_sync_*
+ * dd_used_bytes
+ * dd_tempreserved
+ * dd_space_towrite
+ * dd_myname
+ * dd_phys accounting?
+ * held from:
+ * dsl_dir_*
+ * dsl_prop_changed_notify: none (dd_prop_cbs)
+ * dsl_prop_register: none (dd_prop_cbs)
+ * dsl_prop_unregister: none (dd_prop_cbs)
+ * dsl_dataset_block_freeable: none (dd_sync_*)
+ *
+ * os_lock (leaf)
+ * protects:
+ * os_dirty_dnodes
+ * os_free_dnodes
+ * os_dnodes
+ * os_downgraded_dbufs
+ * dn_dirtyblksz
+ * dn_dirty_link
+ * held from:
+ * dnode_create: none (os_dnodes)
+ * dnode_destroy: none (os_dnodes)
+ * dnode_setdirty: none (dn_dirtyblksz, os_*_dnodes)
+ * dnode_free: none (dn_dirtyblksz, os_*_dnodes)
+ *
+ * ds_lock
+ * protects:
+ * ds_objset
+ * ds_open_refcount
+ * ds_snapname
+ * ds_phys accounting
+ * ds_phys userrefs zapobj
+ * ds_reserved
+ * held from:
+ * dsl_dataset_*
+ *
+ * dr_mtx (leaf)
+ * protects:
+ * dr_children
+ * held from:
+ * dbuf_dirty
+ * dbuf_undirty
+ * dbuf_sync_indirect
+ * dnode_new_blkid
+ */
+
+struct objset;
+struct dmu_pool;
+
+typedef struct dmu_xuio {
+ int next;
+ int cnt;
+ struct arc_buf **bufs;
+ iovec_t *iovp;
+} dmu_xuio_t;
+
+typedef struct xuio_stats {
+ /* loaned yet not returned arc_buf */
+ kstat_named_t xuiostat_onloan_rbuf;
+ kstat_named_t xuiostat_onloan_wbuf;
+ /* whether a copy is made when loaning out a read buffer */
+ kstat_named_t xuiostat_rbuf_copied;
+ kstat_named_t xuiostat_rbuf_nocopy;
+ /* whether a copy is made when assigning a write buffer */
+ kstat_named_t xuiostat_wbuf_copied;
+ kstat_named_t xuiostat_wbuf_nocopy;
+} xuio_stats_t;
+
+static xuio_stats_t xuio_stats = {
+ { "onloan_read_buf", KSTAT_DATA_UINT64 },
+ { "onloan_write_buf", KSTAT_DATA_UINT64 },
+ { "read_buf_copied", KSTAT_DATA_UINT64 },
+ { "read_buf_nocopy", KSTAT_DATA_UINT64 },
+ { "write_buf_copied", KSTAT_DATA_UINT64 },
+ { "write_buf_nocopy", KSTAT_DATA_UINT64 }
+};
+
+#define XUIOSTAT_INCR(stat, val) \
+ atomic_add_64(&xuio_stats.stat.value.ui64, (val))
+#define XUIOSTAT_BUMP(stat) XUIOSTAT_INCR(stat, 1)
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _SYS_DMU_IMPL_H */