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diff --git a/uts/common/fs/zfs/sys/space_map.h b/uts/common/fs/zfs/sys/space_map.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 2009 Sun Microsystems, Inc. All rights reserved.
+ * Use is subject to license terms.
+ */
+
+#ifndef _SYS_SPACE_MAP_H
+#define _SYS_SPACE_MAP_H
+
+#include <sys/avl.h>
+#include <sys/dmu.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef struct space_map_ops space_map_ops_t;
+
+typedef struct space_map {
+ avl_tree_t sm_root; /* AVL tree of map segments */
+ uint64_t sm_space; /* sum of all segments in the map */
+ uint64_t sm_start; /* start of map */
+ uint64_t sm_size; /* size of map */
+ uint8_t sm_shift; /* unit shift */
+ uint8_t sm_pad[3]; /* unused */
+ uint8_t sm_loaded; /* map loaded? */
+ uint8_t sm_loading; /* map loading? */
+ kcondvar_t sm_load_cv; /* map load completion */
+ space_map_ops_t *sm_ops; /* space map block picker ops vector */
+ avl_tree_t *sm_pp_root; /* picker-private AVL tree */
+ void *sm_ppd; /* picker-private data */
+ kmutex_t *sm_lock; /* pointer to lock that protects map */
+} space_map_t;
+
+typedef struct space_seg {
+ avl_node_t ss_node; /* AVL node */
+ avl_node_t ss_pp_node; /* AVL picker-private node */
+ uint64_t ss_start; /* starting offset of this segment */
+ uint64_t ss_end; /* ending offset (non-inclusive) */
+} space_seg_t;
+
+typedef struct space_ref {
+ avl_node_t sr_node; /* AVL node */
+ uint64_t sr_offset; /* offset (start or end) */
+ int64_t sr_refcnt; /* associated reference count */
+} space_ref_t;
+
+typedef struct space_map_obj {
+ uint64_t smo_object; /* on-disk space map object */
+ uint64_t smo_objsize; /* size of the object */
+ uint64_t smo_alloc; /* space allocated from the map */
+} space_map_obj_t;
+
+struct space_map_ops {
+ void (*smop_load)(space_map_t *sm);
+ void (*smop_unload)(space_map_t *sm);
+ uint64_t (*smop_alloc)(space_map_t *sm, uint64_t size);
+ void (*smop_claim)(space_map_t *sm, uint64_t start, uint64_t size);
+ void (*smop_free)(space_map_t *sm, uint64_t start, uint64_t size);
+ uint64_t (*smop_max)(space_map_t *sm);
+ boolean_t (*smop_fragmented)(space_map_t *sm);
+};
+
+/*
+ * debug entry
+ *
+ * 1 3 10 50
+ * ,---+--------+------------+---------------------------------.
+ * | 1 | action | syncpass | txg (lower bits) |
+ * `---+--------+------------+---------------------------------'
+ * 63 62 60 59 50 49 0
+ *
+ *
+ *
+ * non-debug entry
+ *
+ * 1 47 1 15
+ * ,-----------------------------------------------------------.
+ * | 0 | offset (sm_shift units) | type | run |
+ * `-----------------------------------------------------------'
+ * 63 62 17 16 15 0
+ */
+
+/* All this stuff takes and returns bytes */
+#define SM_RUN_DECODE(x) (BF64_DECODE(x, 0, 15) + 1)
+#define SM_RUN_ENCODE(x) BF64_ENCODE((x) - 1, 0, 15)
+#define SM_TYPE_DECODE(x) BF64_DECODE(x, 15, 1)
+#define SM_TYPE_ENCODE(x) BF64_ENCODE(x, 15, 1)
+#define SM_OFFSET_DECODE(x) BF64_DECODE(x, 16, 47)
+#define SM_OFFSET_ENCODE(x) BF64_ENCODE(x, 16, 47)
+#define SM_DEBUG_DECODE(x) BF64_DECODE(x, 63, 1)
+#define SM_DEBUG_ENCODE(x) BF64_ENCODE(x, 63, 1)
+
+#define SM_DEBUG_ACTION_DECODE(x) BF64_DECODE(x, 60, 3)
+#define SM_DEBUG_ACTION_ENCODE(x) BF64_ENCODE(x, 60, 3)
+
+#define SM_DEBUG_SYNCPASS_DECODE(x) BF64_DECODE(x, 50, 10)
+#define SM_DEBUG_SYNCPASS_ENCODE(x) BF64_ENCODE(x, 50, 10)
+
+#define SM_DEBUG_TXG_DECODE(x) BF64_DECODE(x, 0, 50)
+#define SM_DEBUG_TXG_ENCODE(x) BF64_ENCODE(x, 0, 50)
+
+#define SM_RUN_MAX SM_RUN_DECODE(~0ULL)
+
+#define SM_ALLOC 0x0
+#define SM_FREE 0x1
+
+/*
+ * The data for a given space map can be kept on blocks of any size.
+ * Larger blocks entail fewer i/o operations, but they also cause the
+ * DMU to keep more data in-core, and also to waste more i/o bandwidth
+ * when only a few blocks have changed since the last transaction group.
+ * This could use a lot more research, but for now, set the freelist
+ * block size to 4k (2^12).
+ */
+#define SPACE_MAP_BLOCKSHIFT 12
+
+typedef void space_map_func_t(space_map_t *sm, uint64_t start, uint64_t size);
+
+extern void space_map_create(space_map_t *sm, uint64_t start, uint64_t size,
+ uint8_t shift, kmutex_t *lp);
+extern void space_map_destroy(space_map_t *sm);
+extern void space_map_add(space_map_t *sm, uint64_t start, uint64_t size);
+extern void space_map_remove(space_map_t *sm, uint64_t start, uint64_t size);
+extern boolean_t space_map_contains(space_map_t *sm,
+ uint64_t start, uint64_t size);
+extern void space_map_vacate(space_map_t *sm,
+ space_map_func_t *func, space_map_t *mdest);
+extern void space_map_walk(space_map_t *sm,
+ space_map_func_t *func, space_map_t *mdest);
+
+extern void space_map_load_wait(space_map_t *sm);
+extern int space_map_load(space_map_t *sm, space_map_ops_t *ops,
+ uint8_t maptype, space_map_obj_t *smo, objset_t *os);
+extern void space_map_unload(space_map_t *sm);
+
+extern uint64_t space_map_alloc(space_map_t *sm, uint64_t size);
+extern void space_map_claim(space_map_t *sm, uint64_t start, uint64_t size);
+extern void space_map_free(space_map_t *sm, uint64_t start, uint64_t size);
+extern uint64_t space_map_maxsize(space_map_t *sm);
+
+extern void space_map_sync(space_map_t *sm, uint8_t maptype,
+ space_map_obj_t *smo, objset_t *os, dmu_tx_t *tx);
+extern void space_map_truncate(space_map_obj_t *smo,
+ objset_t *os, dmu_tx_t *tx);
+
+extern void space_map_ref_create(avl_tree_t *t);
+extern void space_map_ref_destroy(avl_tree_t *t);
+extern void space_map_ref_add_seg(avl_tree_t *t,
+ uint64_t start, uint64_t end, int64_t refcnt);
+extern void space_map_ref_add_map(avl_tree_t *t,
+ space_map_t *sm, int64_t refcnt);
+extern void space_map_ref_generate_map(avl_tree_t *t,
+ space_map_t *sm, int64_t minref);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _SYS_SPACE_MAP_H */