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fs: btrfs: Crossport rbtree-utils from btrfs-progs

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This is needed for incoming extent-cache infrastructure.

Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: Marek Behún <marek.behun@nic.cz>
This commit is contained in:
Qu Wenruo 2020-06-24 18:02:50 +02:00 committed by Tom Rini
parent 4aebb99486
commit bc621e545b
3 changed files with 138 additions and 1 deletions
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3
fs/btrfs/Makefile
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@ -3,4 +3,5 @@
# 2017 Marek Behun, CZ.NIC, marek.behun@nic.cz
obj-y := btrfs.o chunk-map.o compression.o ctree.o dev.o dir-item.o \
extent-io.o inode.o root.o subvolume.o crypto/hash.o disk-io.o
extent-io.o inode.o root.o subvolume.o crypto/hash.o disk-io.o \
common/rbtree-utils.o extent-cache.o

83
fs/btrfs/common/rbtree-utils.c Normal file
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@ -0,0 +1,83 @@
/*
* 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 <linux/errno.h>
#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);
}
}

53
fs/btrfs/common/rbtree-utils.h Normal file
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@ -0,0 +1,53 @@
/*
* 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.
*/
#ifndef __RBTREE_UTILS__
#define __RBTREE_UTILS__
#include <linux/rbtree.h>
#ifdef __cplusplus
extern "C" {
#endif
/* The common insert/search/free functions */
typedef int (*rb_compare_nodes)(struct rb_node *node1, struct rb_node *node2);
typedef int (*rb_compare_keys)(struct rb_node *node, void *key);
typedef void (*rb_free_node)(struct rb_node *node);
int rb_insert(struct rb_root *root, struct rb_node *node,
rb_compare_nodes comp);
/*
* In some cases, we need return the next node if we don't find the node we
* specify. At this time, we can use next_ret.
*/
struct rb_node *rb_search(struct rb_root *root, void *key, rb_compare_keys comp,
struct rb_node **next_ret);
void rb_free_nodes(struct rb_root *root, rb_free_node free_node);
#define FREE_RB_BASED_TREE(name, free_func) \
static void free_##name##_tree(struct rb_root *root) \
{ \
rb_free_nodes(root, free_func); \
}
#ifdef __cplusplus
}
#endif
#endif