2 * Copyright (C) 2007 Oracle. All rights reserved.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public
6 * License v2 as published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
13 * You should have received a copy of the GNU General Public
14 * License along with this program; if not, write to the
15 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
16 * Boston, MA 021110-1307, USA.
19 #include <linux/gfp.h>
20 #include <linux/slab.h>
22 #include "transaction.h"
23 #include "btrfs_inode.h"
28 struct rb_node rb_node;
32 * returns > 0 if entry passed (root, objectid) is > entry,
33 * < 0 if (root, objectid) < entry and zero if they are equal
35 static int comp_entry(struct tree_entry *entry, u64 root_objectid,
38 if (root_objectid < entry->root_objectid)
40 if (root_objectid > entry->root_objectid)
42 if (objectid < entry->objectid)
44 if (objectid > entry->objectid)
49 static struct rb_node *tree_insert(struct rb_root *root, u64 root_objectid,
50 u64 objectid, struct rb_node *node)
52 struct rb_node ** p = &root->rb_node;
53 struct rb_node * parent = NULL;
54 struct tree_entry *entry;
59 entry = rb_entry(parent, struct tree_entry, rb_node);
61 comp = comp_entry(entry, root_objectid, objectid);
70 rb_link_node(node, parent, p);
71 rb_insert_color(node, root);
75 static struct rb_node *__tree_search(struct rb_root *root, u64 root_objectid,
76 u64 objectid, struct rb_node **prev_ret)
78 struct rb_node * n = root->rb_node;
79 struct rb_node *prev = NULL;
80 struct tree_entry *entry;
81 struct tree_entry *prev_entry = NULL;
85 entry = rb_entry(n, struct tree_entry, rb_node);
88 comp = comp_entry(entry, root_objectid, objectid);
100 while(prev && comp_entry(prev_entry, root_objectid, objectid) >= 0) {
101 prev = rb_next(prev);
102 prev_entry = rb_entry(prev, struct tree_entry, rb_node);
108 static inline struct rb_node *tree_search(struct rb_root *root,
109 u64 root_objectid, u64 objectid)
111 struct rb_node *prev;
113 ret = __tree_search(root, root_objectid, objectid, &prev);
119 int btrfs_add_ordered_inode(struct inode *inode)
121 struct btrfs_root *root = BTRFS_I(inode)->root;
122 u64 root_objectid = root->root_key.objectid;
123 u64 transid = root->fs_info->running_transaction->transid;
124 struct tree_entry *entry;
125 struct rb_node *node;
126 struct btrfs_ordered_inode_tree *tree;
128 if (transid <= BTRFS_I(inode)->ordered_trans)
131 tree = &root->fs_info->running_transaction->ordered_inode_tree;
133 read_lock(&tree->lock);
134 node = __tree_search(&tree->tree, root_objectid, inode->i_ino, NULL);
135 read_unlock(&tree->lock);
140 entry = kmalloc(sizeof(*entry), GFP_NOFS);
144 write_lock(&tree->lock);
145 entry->objectid = inode->i_ino;
146 entry->root_objectid = root_objectid;
148 node = tree_insert(&tree->tree, root_objectid,
149 inode->i_ino, &entry->rb_node);
151 BTRFS_I(inode)->ordered_trans = transid;
153 write_unlock(&tree->lock);
159 int btrfs_find_first_ordered_inode(struct btrfs_ordered_inode_tree *tree,
160 u64 *root_objectid, u64 *objectid)
162 struct tree_entry *entry;
163 struct rb_node *node;
165 write_lock(&tree->lock);
166 node = tree_search(&tree->tree, *root_objectid, *objectid);
168 write_unlock(&tree->lock);
171 entry = rb_entry(node, struct tree_entry, rb_node);
173 while(comp_entry(entry, *root_objectid, *objectid) >= 0) {
174 node = rb_next(node);
177 entry = rb_entry(node, struct tree_entry, rb_node);
180 write_unlock(&tree->lock);
184 *root_objectid = entry->root_objectid;
185 *objectid = entry->objectid;
186 write_unlock(&tree->lock);
190 int btrfs_find_del_first_ordered_inode(struct btrfs_ordered_inode_tree *tree,
191 u64 *root_objectid, u64 *objectid)
193 struct tree_entry *entry;
194 struct rb_node *node;
196 write_lock(&tree->lock);
197 node = tree_search(&tree->tree, *root_objectid, *objectid);
199 write_unlock(&tree->lock);
203 entry = rb_entry(node, struct tree_entry, rb_node);
204 while(comp_entry(entry, *root_objectid, *objectid) >= 0) {
205 node = rb_next(node);
208 entry = rb_entry(node, struct tree_entry, rb_node);
211 write_unlock(&tree->lock);
215 *root_objectid = entry->root_objectid;
216 *objectid = entry->objectid;
217 rb_erase(node, &tree->tree);
218 write_unlock(&tree->lock);