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/sched.h>
22 #include "print-tree.h"
23 #include "transaction.h"
26 /* defrag all the leaves in a given btree. If cache_only == 1, don't read
27 * things from disk, otherwise read all the leaves and try to get key order to
28 * better reflect disk order
31 int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
32 struct btrfs_root *root, int cache_only)
34 struct btrfs_path *path = NULL;
47 if (root->fs_info->extent_root == root) {
49 * there's recursion here right now in the tree locking,
50 * we can't defrag the extent root without deadlock
55 if (root->ref_cows == 0 && !is_extent)
58 if (btrfs_test_opt(root, SSD))
61 path = btrfs_alloc_path();
65 level = btrfs_header_level(root->node);
70 if (root->defrag_progress.objectid == 0) {
71 struct extent_buffer *root_node;
74 root_node = btrfs_lock_root_node(root);
75 btrfs_set_lock_blocking(root_node);
76 nritems = btrfs_header_nritems(root_node);
77 root->defrag_max.objectid = 0;
78 /* from above we know this is not a leaf */
79 btrfs_node_key_to_cpu(root_node, &root->defrag_max,
81 btrfs_tree_unlock(root_node);
82 free_extent_buffer(root_node);
83 memset(&key, 0, sizeof(key));
85 memcpy(&key, &root->defrag_progress, sizeof(key));
90 min_trans = root->defrag_trans_start;
92 ret = btrfs_search_forward(root, &key, NULL, path,
93 cache_only, min_trans);
100 btrfs_release_path(root, path);
101 wret = btrfs_search_slot(trans, root, &key, path, 0, 1);
107 if (!path->nodes[1]) {
111 path->slots[1] = btrfs_header_nritems(path->nodes[1]);
112 next_key_ret = btrfs_find_next_key(root, path, &key, 1, cache_only,
114 ret = btrfs_realloc_node(trans, root,
116 cache_only, &last_ret,
117 &root->defrag_progress);
119 WARN_ON(ret == -EAGAIN);
122 if (next_key_ret == 0) {
123 memcpy(&root->defrag_progress, &key, sizeof(key));
128 btrfs_free_path(path);
129 if (ret == -EAGAIN) {
130 if (root->defrag_max.objectid > root->defrag_progress.objectid)
132 if (root->defrag_max.type > root->defrag_progress.type)
134 if (root->defrag_max.offset > root->defrag_progress.offset)
139 if (ret != -EAGAIN) {
140 memset(&root->defrag_progress, 0,
141 sizeof(root->defrag_progress));
142 root->defrag_trans_start = trans->transid;