127 lines
4.5 KiB
C
127 lines
4.5 KiB
C
/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright 2009 Sun Microsystems, Inc. All rights reserved.
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* Use is subject to license terms.
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*/
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/*
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* Copyright (c) 2013, 2017 by Delphix. All rights reserved.
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*/
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#ifndef _SYS_RANGE_TREE_H
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#define _SYS_RANGE_TREE_H
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#include <sys/avl.h>
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#include <sys/dmu.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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#define RANGE_TREE_HISTOGRAM_SIZE 64
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typedef struct range_tree_ops range_tree_ops_t;
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/*
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* Note: the range_tree may not be accessed concurrently; consumers
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* must provide external locking if required.
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*/
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typedef struct range_tree {
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avl_tree_t rt_root; /* offset-ordered segment AVL tree */
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uint64_t rt_space; /* sum of all segments in the map */
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uint64_t rt_gap; /* allowable inter-segment gap */
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range_tree_ops_t *rt_ops;
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/* rt_avl_compare should only be set if rt_arg is an AVL tree */
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void *rt_arg;
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int (*rt_avl_compare)(const void *, const void *);
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/*
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* The rt_histogram maintains a histogram of ranges. Each bucket,
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* rt_histogram[i], contains the number of ranges whose size is:
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* 2^i <= size of range in bytes < 2^(i+1)
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*/
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uint64_t rt_histogram[RANGE_TREE_HISTOGRAM_SIZE];
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} range_tree_t;
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typedef struct range_seg {
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avl_node_t rs_node; /* AVL node */
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avl_node_t rs_pp_node; /* AVL picker-private node */
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uint64_t rs_start; /* starting offset of this segment */
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uint64_t rs_end; /* ending offset (non-inclusive) */
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uint64_t rs_fill; /* actual fill if gap mode is on */
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} range_seg_t;
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struct range_tree_ops {
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void (*rtop_create)(range_tree_t *rt, void *arg);
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void (*rtop_destroy)(range_tree_t *rt, void *arg);
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void (*rtop_add)(range_tree_t *rt, range_seg_t *rs, void *arg);
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void (*rtop_remove)(range_tree_t *rt, range_seg_t *rs, void *arg);
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void (*rtop_vacate)(range_tree_t *rt, void *arg);
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};
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typedef void range_tree_func_t(void *arg, uint64_t start, uint64_t size);
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void range_tree_init(void);
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void range_tree_fini(void);
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range_tree_t *range_tree_create_impl(range_tree_ops_t *ops, void *arg,
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int (*avl_compare) (const void *, const void *), uint64_t gap);
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range_tree_t *range_tree_create(range_tree_ops_t *ops, void *arg);
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void range_tree_destroy(range_tree_t *rt);
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boolean_t range_tree_contains(range_tree_t *rt, uint64_t start, uint64_t size);
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void range_tree_verify_not_present(range_tree_t *rt,
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uint64_t start, uint64_t size);
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range_seg_t *range_tree_find(range_tree_t *rt, uint64_t start, uint64_t size);
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void range_tree_resize_segment(range_tree_t *rt, range_seg_t *rs,
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uint64_t newstart, uint64_t newsize);
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uint64_t range_tree_space(range_tree_t *rt);
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boolean_t range_tree_is_empty(range_tree_t *rt);
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void range_tree_swap(range_tree_t **rtsrc, range_tree_t **rtdst);
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void range_tree_stat_verify(range_tree_t *rt);
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uint64_t range_tree_min(range_tree_t *rt);
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uint64_t range_tree_max(range_tree_t *rt);
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uint64_t range_tree_span(range_tree_t *rt);
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void range_tree_add(void *arg, uint64_t start, uint64_t size);
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void range_tree_remove(void *arg, uint64_t start, uint64_t size);
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void range_tree_remove_fill(range_tree_t *rt, uint64_t start, uint64_t size);
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void range_tree_adjust_fill(range_tree_t *rt, range_seg_t *rs, int64_t delta);
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void range_tree_clear(range_tree_t *rt, uint64_t start, uint64_t size);
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void range_tree_vacate(range_tree_t *rt, range_tree_func_t *func, void *arg);
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void range_tree_walk(range_tree_t *rt, range_tree_func_t *func, void *arg);
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range_seg_t *range_tree_first(range_tree_t *rt);
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void rt_avl_create(range_tree_t *rt, void *arg);
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void rt_avl_destroy(range_tree_t *rt, void *arg);
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void rt_avl_add(range_tree_t *rt, range_seg_t *rs, void *arg);
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void rt_avl_remove(range_tree_t *rt, range_seg_t *rs, void *arg);
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void rt_avl_vacate(range_tree_t *rt, void *arg);
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extern struct range_tree_ops rt_avl_ops;
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#ifdef __cplusplus
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}
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#endif
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#endif /* _SYS_RANGE_TREE_H */
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