mirror of
https://github.com/kdave/btrfs-progs
synced 2024-12-09 08:00:13 +00:00
cdb9e22e29
These were added to deal with duplicated functionality within btrfs-progs, but we specifically copied rbtree.c from the kernel, so move these functions out into their own file. This will make it easier to keep rbtree.c in sync. Thanks, Signed-off-by: Josef Bacik <jbacik@fb.com> Signed-off-by: David Sterba <dsterba@suse.cz>
83 lines
1.8 KiB
C
83 lines
1.8 KiB
C
/*
|
|
* Copyright (C) 2014 Facebook. All rights reserved.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public
|
|
* License v2 as published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public
|
|
* License along with this program; if not, write to the
|
|
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
|
* Boston, MA 021110-1307, USA.
|
|
*/
|
|
|
|
#include "rbtree-utils.h"
|
|
|
|
int rb_insert(struct rb_root *root, struct rb_node *node,
|
|
rb_compare_nodes comp)
|
|
{
|
|
struct rb_node **p = &root->rb_node;
|
|
struct rb_node *parent = NULL;
|
|
int ret;
|
|
|
|
while(*p) {
|
|
parent = *p;
|
|
|
|
ret = comp(parent, node);
|
|
if (ret < 0)
|
|
p = &(*p)->rb_left;
|
|
else if (ret > 0)
|
|
p = &(*p)->rb_right;
|
|
else
|
|
return -EEXIST;
|
|
}
|
|
|
|
rb_link_node(node, parent, p);
|
|
rb_insert_color(node, root);
|
|
return 0;
|
|
}
|
|
|
|
struct rb_node *rb_search(struct rb_root *root, void *key, rb_compare_keys comp,
|
|
struct rb_node **next_ret)
|
|
{
|
|
struct rb_node *n = root->rb_node;
|
|
struct rb_node *parent = NULL;
|
|
int ret = 0;
|
|
|
|
while(n) {
|
|
parent = n;
|
|
|
|
ret = comp(n, key);
|
|
if (ret < 0)
|
|
n = n->rb_left;
|
|
else if (ret > 0)
|
|
n = n->rb_right;
|
|
else
|
|
return n;
|
|
}
|
|
|
|
if (!next_ret)
|
|
return NULL;
|
|
|
|
if (parent && ret > 0)
|
|
parent = rb_next(parent);
|
|
|
|
*next_ret = parent;
|
|
return NULL;
|
|
}
|
|
|
|
void rb_free_nodes(struct rb_root *root, rb_free_node free_node)
|
|
{
|
|
struct rb_node *node;
|
|
|
|
while ((node = rb_first(root))) {
|
|
rb_erase(node, root);
|
|
free_node(node);
|
|
}
|
|
}
|