blob: 992ab425599d10bfe0b32e866b9c4bd366a1a9b9 [file] [log] [blame]
Chris Mason6702ed42007-08-07 16:15:09 -04001/*
2 * Copyright (C) 2007 Oracle. All rights reserved.
3 *
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.
7 *
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.
12 *
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.
17 */
18
19#include <linux/sched.h>
20#include "ctree.h"
21#include "disk-io.h"
22#include "print-tree.h"
23#include "transaction.h"
Chris Masone7a84562008-06-25 16:01:31 -040024#include "locking.h"
Chris Mason6702ed42007-08-07 16:15:09 -040025
Chris Masond3977122009-01-05 21:25:51 -050026/* 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
Chris Masond352ac62008-09-29 15:18:18 -040028 * better reflect disk order
29 */
Chris Masond3977122009-01-05 21:25:51 -050030
Chris Mason6702ed42007-08-07 16:15:09 -040031int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
32 struct btrfs_root *root, int cache_only)
33{
34 struct btrfs_path *path = NULL;
Chris Masone7a84562008-06-25 16:01:31 -040035 struct btrfs_key key;
Chris Mason6702ed42007-08-07 16:15:09 -040036 int ret = 0;
37 int wret;
38 int level;
Chris Masone9d0b132007-08-10 14:06:19 -040039 int is_extent = 0;
Chris Masone7a84562008-06-25 16:01:31 -040040 int next_key_ret = 0;
Chris Masone9d0b132007-08-10 14:06:19 -040041 u64 last_ret = 0;
Chris Mason3f157a22008-06-25 16:01:31 -040042 u64 min_trans = 0;
43
44 if (cache_only)
45 goto out;
Chris Mason6702ed42007-08-07 16:15:09 -040046
Chris Masone7a84562008-06-25 16:01:31 -040047 if (root->fs_info->extent_root == root) {
Chris Mason1b1e2132008-06-25 16:01:31 -040048 /*
49 * there's recursion here right now in the tree locking,
50 * we can't defrag the extent root without deadlock
51 */
52 goto out;
Chris Masone7a84562008-06-25 16:01:31 -040053 }
Chris Mason925baed2008-06-25 16:01:30 -040054
Chris Masone9d0b132007-08-10 14:06:19 -040055 if (root->ref_cows == 0 && !is_extent)
Chris Mason6702ed42007-08-07 16:15:09 -040056 goto out;
Chris Mason5f39d392007-10-15 16:14:19 -040057
Chris Mason9afbb0b2008-02-15 13:19:35 -050058 if (btrfs_test_opt(root, SSD))
59 goto out;
60
Chris Mason6702ed42007-08-07 16:15:09 -040061 path = btrfs_alloc_path();
62 if (!path)
63 return -ENOMEM;
64
Chris Mason5f39d392007-10-15 16:14:19 -040065 level = btrfs_header_level(root->node);
Chris Mason0f1ebbd2007-10-15 16:19:46 -040066
Chris Masond3977122009-01-05 21:25:51 -050067 if (level == 0)
Chris Mason6702ed42007-08-07 16:15:09 -040068 goto out;
Chris Masond3977122009-01-05 21:25:51 -050069
Chris Mason6702ed42007-08-07 16:15:09 -040070 if (root->defrag_progress.objectid == 0) {
Chris Masone7a84562008-06-25 16:01:31 -040071 struct extent_buffer *root_node;
Chris Mason0ef3e662008-05-24 14:04:53 -040072 u32 nritems;
73
Chris Masone7a84562008-06-25 16:01:31 -040074 root_node = btrfs_lock_root_node(root);
Chris Masonb4ce94d2009-02-04 09:25:08 -050075 btrfs_set_lock_blocking(root_node);
Chris Masone7a84562008-06-25 16:01:31 -040076 nritems = btrfs_header_nritems(root_node);
Chris Mason0ef3e662008-05-24 14:04:53 -040077 root->defrag_max.objectid = 0;
78 /* from above we know this is not a leaf */
Chris Masone7a84562008-06-25 16:01:31 -040079 btrfs_node_key_to_cpu(root_node, &root->defrag_max,
Chris Mason0ef3e662008-05-24 14:04:53 -040080 nritems - 1);
Chris Masone7a84562008-06-25 16:01:31 -040081 btrfs_tree_unlock(root_node);
82 free_extent_buffer(root_node);
83 memset(&key, 0, sizeof(key));
Chris Mason6702ed42007-08-07 16:15:09 -040084 } else {
Chris Masone7a84562008-06-25 16:01:31 -040085 memcpy(&key, &root->defrag_progress, sizeof(key));
Chris Mason6702ed42007-08-07 16:15:09 -040086 }
87
Chris Masone7a84562008-06-25 16:01:31 -040088 path->keep_locks = 1;
Chris Mason3f157a22008-06-25 16:01:31 -040089 if (cache_only)
90 min_trans = root->defrag_trans_start;
91
Chris Masone02119d2008-09-05 16:13:11 -040092 ret = btrfs_search_forward(root, &key, NULL, path,
93 cache_only, min_trans);
Chris Mason3f157a22008-06-25 16:01:31 -040094 if (ret < 0)
95 goto out;
96 if (ret > 0) {
97 ret = 0;
98 goto out;
99 }
100 btrfs_release_path(root, path);
Chris Masone7a84562008-06-25 16:01:31 -0400101 wret = btrfs_search_slot(trans, root, &key, path, 0, 1);
Chris Mason6702ed42007-08-07 16:15:09 -0400102
Chris Masone7a84562008-06-25 16:01:31 -0400103 if (wret < 0) {
104 ret = wret;
105 goto out;
Chris Mason6702ed42007-08-07 16:15:09 -0400106 }
Chris Masone7a84562008-06-25 16:01:31 -0400107 if (!path->nodes[1]) {
108 ret = 0;
109 goto out;
110 }
111 path->slots[1] = btrfs_header_nritems(path->nodes[1]);
Chris Mason3f157a22008-06-25 16:01:31 -0400112 next_key_ret = btrfs_find_next_key(root, path, &key, 1, cache_only,
113 min_trans);
Chris Masone7a84562008-06-25 16:01:31 -0400114 ret = btrfs_realloc_node(trans, root,
115 path->nodes[1], 0,
116 cache_only, &last_ret,
117 &root->defrag_progress);
Yan, Zheng8929ecfa2010-05-16 10:49:58 -0400118 if (ret) {
119 WARN_ON(ret == -EAGAIN);
120 goto out;
121 }
Chris Masone7a84562008-06-25 16:01:31 -0400122 if (next_key_ret == 0) {
123 memcpy(&root->defrag_progress, &key, sizeof(key));
124 ret = -EAGAIN;
125 }
Chris Mason6702ed42007-08-07 16:15:09 -0400126out:
127 if (path)
128 btrfs_free_path(path);
Chris Mason0ef3e662008-05-24 14:04:53 -0400129 if (ret == -EAGAIN) {
130 if (root->defrag_max.objectid > root->defrag_progress.objectid)
131 goto done;
132 if (root->defrag_max.type > root->defrag_progress.type)
133 goto done;
134 if (root->defrag_max.offset > root->defrag_progress.offset)
135 goto done;
136 ret = 0;
137 }
138done:
Chris Mason6702ed42007-08-07 16:15:09 -0400139 if (ret != -EAGAIN) {
140 memset(&root->defrag_progress, 0,
141 sizeof(root->defrag_progress));
Chris Mason3f157a22008-06-25 16:01:31 -0400142 root->defrag_trans_start = trans->transid;
Chris Mason6702ed42007-08-07 16:15:09 -0400143 }
144 return ret;
145}