1 /*- 2 * Copyright (c) 2010 Isilon Systems, Inc. 3 * Copyright (c) 2010 iX Systems, Inc. 4 * Copyright (c) 2010 Panasas, Inc. 5 * Copyright (c) 2013, 2014 Mellanox Technologies, Ltd. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice unmodified, this list of conditions, and the following 13 * disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 * 29 * $FreeBSD$ 30 */ 31 #ifndef _LINUX_RBTREE_H_ 32 #define _LINUX_RBTREE_H_ 33 34 #include <sys/stddef.h> 35 #include <sys/tree.h> 36 37 struct rb_node { 38 RB_ENTRY(rb_node) __entry; 39 }; 40 #define rb_left __entry.rbe_left 41 #define rb_right __entry.rbe_right 42 43 /* 44 * We provide a false structure that has the same bit pattern as tree.h 45 * presents so it matches the member names expected by linux. 46 */ 47 struct rb_root { 48 struct rb_node *rb_node; 49 }; 50 51 /* 52 * In linux all of the comparisons are done by the caller. 53 */ 54 int panic_cmp(struct rb_node *one, struct rb_node *two); 55 56 RB_HEAD(linux_root, rb_node); 57 RB_PROTOTYPE(linux_root, rb_node, __entry, panic_cmp); 58 59 #define rb_parent(r) RB_PARENT(r, __entry) 60 #define rb_color(r) RB_COLOR(r, __entry) 61 #define rb_is_red(r) (rb_color(r) == RB_RED) 62 #define rb_is_black(r) (rb_color(r) == RB_BLACK) 63 #define rb_set_parent(r, p) rb_parent((r)) = (p) 64 #define rb_set_color(r, c) rb_color((r)) = (c) 65 #define rb_entry(ptr, type, member) container_of(ptr, type, member) 66 67 #define RB_EMPTY_ROOT(root) RB_EMPTY((struct linux_root *)root) 68 #define RB_EMPTY_NODE(node) (rb_parent(node) == node) 69 #define RB_CLEAR_NODE(node) (rb_set_parent(node, node)) 70 71 #define rb_insert_color(node, root) \ 72 linux_root_RB_INSERT_COLOR((struct linux_root *)(root), (node)) 73 #define rb_erase(node, root) \ 74 linux_root_RB_REMOVE((struct linux_root *)(root), (node)) 75 #define rb_next(node) RB_NEXT(linux_root, NULL, (node)) 76 #define rb_prev(node) RB_PREV(linux_root, NULL, (node)) 77 #define rb_first(root) RB_MIN(linux_root, (struct linux_root *)(root)) 78 #define rb_last(root) RB_MAX(linux_root, (struct linux_root *)(root)) 79 80 static inline void 81 rb_link_node(struct rb_node *node, struct rb_node *parent, 82 struct rb_node **rb_link) 83 { 84 rb_set_parent(node, parent); 85 rb_set_color(node, RB_RED); 86 node->__entry.rbe_left = node->__entry.rbe_right = NULL; 87 *rb_link = node; 88 } 89 90 static inline void 91 rb_replace_node(struct rb_node *victim, struct rb_node *new, 92 struct rb_root *root) 93 { 94 struct rb_node *p; 95 96 p = rb_parent(victim); 97 if (p) { 98 if (p->rb_left == victim) 99 p->rb_left = new; 100 else 101 p->rb_right = new; 102 } else 103 root->rb_node = new; 104 if (victim->rb_left) 105 rb_set_parent(victim->rb_left, new); 106 if (victim->rb_right) 107 rb_set_parent(victim->rb_right, new); 108 *new = *victim; 109 } 110 111 #undef RB_ROOT 112 #define RB_ROOT (struct rb_root) { NULL } 113 114 #endif /* _LINUX_RBTREE_H_ */ 115