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 #ifndef _LINUX_RBTREE_H_ 30 #define _LINUX_RBTREE_H_ 31 32 #include <linux/kernel.h> 33 #include <linux/stddef.h> 34 #include <linux/rcupdate.h> 35 36 #include <sys/tree.h> 37 38 struct rb_node { 39 RB_ENTRY(rb_node) __entry; 40 }; 41 #define rb_left __entry.rbe_left 42 #define rb_right __entry.rbe_right 43 44 /* 45 * We provide a false structure that has the same bit pattern as tree.h 46 * presents so it matches the member names expected by linux. 47 */ 48 struct rb_root { 49 struct rb_node *rb_node; 50 }; 51 52 /* 53 * In linux all of the comparisons are done by the caller. 54 */ 55 int panic_cmp(struct rb_node *one, struct rb_node *two); 56 57 RB_HEAD(linux_root, rb_node); 58 RB_PROTOTYPE(linux_root, rb_node, __entry, panic_cmp); 59 60 #define rb_parent(r) RB_PARENT(r, __entry) 61 #define rb_color(r) RB_COLOR(r, __entry) 62 #define rb_is_red(r) (rb_color(r) == RB_RED) 63 #define rb_is_black(r) (rb_color(r) == RB_BLACK) 64 #define rb_set_parent(r, p) rb_parent((r)) = (p) 65 #define rb_set_color(r, c) rb_color((r)) = (c) 66 #define rb_entry(ptr, type, member) container_of(ptr, type, member) 67 68 #define RB_EMPTY_ROOT(root) RB_EMPTY((struct linux_root *)root) 69 #define RB_EMPTY_NODE(node) (rb_parent(node) == node) 70 #define RB_CLEAR_NODE(node) (rb_set_parent(node, node)) 71 72 #define rb_insert_color(node, root) \ 73 linux_root_RB_INSERT_COLOR((struct linux_root *)(root), (node)) 74 #define rb_erase(node, root) \ 75 linux_root_RB_REMOVE((struct linux_root *)(root), (node)) 76 #define rb_next(node) RB_NEXT(linux_root, NULL, (node)) 77 #define rb_prev(node) RB_PREV(linux_root, NULL, (node)) 78 #define rb_first(root) RB_MIN(linux_root, (struct linux_root *)(root)) 79 #define rb_last(root) RB_MAX(linux_root, (struct linux_root *)(root)) 80 81 static inline void 82 rb_link_node(struct rb_node *node, struct rb_node *parent, 83 struct rb_node **rb_link) 84 { 85 rb_set_parent(node, parent); 86 rb_set_color(node, RB_RED); 87 node->__entry.rbe_left = node->__entry.rbe_right = NULL; 88 *rb_link = node; 89 } 90 91 static inline void 92 rb_replace_node(struct rb_node *victim, struct rb_node *new, 93 struct rb_root *root) 94 { 95 struct rb_node *p; 96 97 p = rb_parent(victim); 98 if (p) { 99 if (p->rb_left == victim) 100 p->rb_left = new; 101 else 102 p->rb_right = new; 103 } else 104 root->rb_node = new; 105 if (victim->rb_left) 106 rb_set_parent(victim->rb_left, new); 107 if (victim->rb_right) 108 rb_set_parent(victim->rb_right, new); 109 *new = *victim; 110 } 111 112 #define LINUX_RB_ROOT (struct rb_root) { NULL } 113 114 #endif /* _LINUX_RBTREE_H_ */ 115