From: Qu Wenruo wqu@suse.com
This is needed for incoming extent-cache infrastructure.
Signed-off-by: Qu Wenruo wqu@suse.com Reviewed-by: Marek Behún marek.behun@nic.cz --- fs/btrfs/Makefile | 3 +- fs/btrfs/common/rbtree-utils.c | 83 ++++++++++++++++++++++++++++++++++ fs/btrfs/common/rbtree-utils.h | 53 ++++++++++++++++++++++ 3 files changed, 138 insertions(+), 1 deletion(-) create mode 100644 fs/btrfs/common/rbtree-utils.c create mode 100644 fs/btrfs/common/rbtree-utils.h
diff --git a/fs/btrfs/Makefile b/fs/btrfs/Makefile index bd4b848d1b..53be6e8835 100644 --- a/fs/btrfs/Makefile +++ b/fs/btrfs/Makefile @@ -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 diff --git a/fs/btrfs/common/rbtree-utils.c b/fs/btrfs/common/rbtree-utils.c new file mode 100644 index 0000000000..7a7d7e84e6 --- /dev/null +++ b/fs/btrfs/common/rbtree-utils.c @@ -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); + } +} diff --git a/fs/btrfs/common/rbtree-utils.h b/fs/btrfs/common/rbtree-utils.h new file mode 100644 index 0000000000..d977cfd955 --- /dev/null +++ b/fs/btrfs/common/rbtree-utils.h @@ -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