1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 /* 22 * Copyright 2009 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 /* 27 * Copyright (c) 2013, 2014 by Delphix. All rights reserved. 28 */ 29 30 #ifndef _SYS_RANGE_TREE_H 31 #define _SYS_RANGE_TREE_H 32 33 #include <sys/avl.h> 34 #include <sys/dmu.h> 35 36 #ifdef __cplusplus 37 extern "C" { 38 #endif 39 40 #define RANGE_TREE_HISTOGRAM_SIZE 64 41 42 typedef struct range_tree_ops range_tree_ops_t; 43 44 typedef struct range_tree { 45 avl_tree_t rt_root; /* offset-ordered segment AVL tree */ 46 uint64_t rt_space; /* sum of all segments in the map */ 47 range_tree_ops_t *rt_ops; 48 void *rt_arg; 49 50 /* 51 * The rt_histogram maintains a histogram of ranges. Each bucket, 52 * rt_histogram[i], contains the number of ranges whose size is: 53 * 2^i <= size of range in bytes < 2^(i+1) 54 */ 55 uint64_t rt_histogram[RANGE_TREE_HISTOGRAM_SIZE]; 56 kmutex_t *rt_lock; /* pointer to lock that protects map */ 57 } range_tree_t; 58 59 typedef struct range_seg { 60 avl_node_t rs_node; /* AVL node */ 61 avl_node_t rs_pp_node; /* AVL picker-private node */ 62 uint64_t rs_start; /* starting offset of this segment */ 63 uint64_t rs_end; /* ending offset (non-inclusive) */ 64 } range_seg_t; 65 66 struct range_tree_ops { 67 void (*rtop_create)(range_tree_t *rt, void *arg); 68 void (*rtop_destroy)(range_tree_t *rt, void *arg); 69 void (*rtop_add)(range_tree_t *rt, range_seg_t *rs, void *arg); 70 void (*rtop_remove)(range_tree_t *rt, range_seg_t *rs, void *arg); 71 void (*rtop_vacate)(range_tree_t *rt, void *arg); 72 }; 73 74 typedef void range_tree_func_t(void *arg, uint64_t start, uint64_t size); 75 76 void range_tree_init(void); 77 void range_tree_fini(void); 78 range_tree_t *range_tree_create(range_tree_ops_t *ops, void *arg, kmutex_t *lp); 79 void range_tree_destroy(range_tree_t *rt); 80 boolean_t range_tree_contains(range_tree_t *rt, uint64_t start, uint64_t size); 81 uint64_t range_tree_space(range_tree_t *rt); 82 void range_tree_verify(range_tree_t *rt, uint64_t start, uint64_t size); 83 void range_tree_swap(range_tree_t **rtsrc, range_tree_t **rtdst); 84 void range_tree_stat_verify(range_tree_t *rt); 85 86 void range_tree_add(void *arg, uint64_t start, uint64_t size); 87 void range_tree_remove(void *arg, uint64_t start, uint64_t size); 88 void range_tree_clear(range_tree_t *rt, uint64_t start, uint64_t size); 89 90 void range_tree_vacate(range_tree_t *rt, range_tree_func_t *func, void *arg); 91 void range_tree_walk(range_tree_t *rt, range_tree_func_t *func, void *arg); 92 93 #ifdef __cplusplus 94 } 95 #endif 96 97 #endif /* _SYS_RANGE_TREE_H */ 98