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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
Eric Sandeende78b512013-01-31 18:21:12 +000026/*
27 * Defrag all the leaves in a given btree.
28 * Read all the leaves and try to get key order to
Chris Masond352ac62008-09-29 15:18:18 -040029 * better reflect disk order
30 */
Chris Masond3977122009-01-05 21:25:51 -050031
Chris Mason6702ed42007-08-07 16:15:09 -040032int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
Eric Sandeende78b512013-01-31 18:21:12 +000033 struct btrfs_root *root)
Chris Mason6702ed42007-08-07 16:15:09 -040034{
35 struct btrfs_path *path = NULL;
Chris Masone7a84562008-06-25 16:01:31 -040036 struct btrfs_key key;
Chris Mason6702ed42007-08-07 16:15:09 -040037 int ret = 0;
38 int wret;
39 int level;
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
Chris Masone7a84562008-06-25 16:01:31 -040044 if (root->fs_info->extent_root == root) {
Chris Mason1b1e2132008-06-25 16:01:31 -040045 /*
46 * there's recursion here right now in the tree locking,
47 * we can't defrag the extent root without deadlock
48 */
49 goto out;
Chris Masone7a84562008-06-25 16:01:31 -040050 }
Chris Mason925baed2008-06-25 16:01:30 -040051
Miao Xie27cdeb72014-04-02 19:51:05 +080052 if (!test_bit(BTRFS_ROOT_REF_COWS, &root->state))
Chris Mason6702ed42007-08-07 16:15:09 -040053 goto out;
Chris Mason5f39d392007-10-15 16:14:19 -040054
Chris Mason6702ed42007-08-07 16:15:09 -040055 path = btrfs_alloc_path();
56 if (!path)
57 return -ENOMEM;
58
Chris Mason5f39d392007-10-15 16:14:19 -040059 level = btrfs_header_level(root->node);
Chris Mason0f1ebbd2007-10-15 16:19:46 -040060
Chris Masond3977122009-01-05 21:25:51 -050061 if (level == 0)
Chris Mason6702ed42007-08-07 16:15:09 -040062 goto out;
Chris Masond3977122009-01-05 21:25:51 -050063
Chris Mason6702ed42007-08-07 16:15:09 -040064 if (root->defrag_progress.objectid == 0) {
Chris Masone7a84562008-06-25 16:01:31 -040065 struct extent_buffer *root_node;
Chris Mason0ef3e662008-05-24 14:04:53 -040066 u32 nritems;
67
Chris Masone7a84562008-06-25 16:01:31 -040068 root_node = btrfs_lock_root_node(root);
Chris Masonb4ce94d2009-02-04 09:25:08 -050069 btrfs_set_lock_blocking(root_node);
Chris Masone7a84562008-06-25 16:01:31 -040070 nritems = btrfs_header_nritems(root_node);
Chris Mason0ef3e662008-05-24 14:04:53 -040071 root->defrag_max.objectid = 0;
72 /* from above we know this is not a leaf */
Chris Masone7a84562008-06-25 16:01:31 -040073 btrfs_node_key_to_cpu(root_node, &root->defrag_max,
Chris Mason0ef3e662008-05-24 14:04:53 -040074 nritems - 1);
Chris Masone7a84562008-06-25 16:01:31 -040075 btrfs_tree_unlock(root_node);
76 free_extent_buffer(root_node);
77 memset(&key, 0, sizeof(key));
Chris Mason6702ed42007-08-07 16:15:09 -040078 } else {
Chris Masone7a84562008-06-25 16:01:31 -040079 memcpy(&key, &root->defrag_progress, sizeof(key));
Chris Mason6702ed42007-08-07 16:15:09 -040080 }
81
Chris Masone7a84562008-06-25 16:01:31 -040082 path->keep_locks = 1;
Chris Mason3f157a22008-06-25 16:01:31 -040083
Filipe David Borba Manana6174d3c2013-10-01 16:13:42 +010084 ret = btrfs_search_forward(root, &key, path, min_trans);
Chris Mason3f157a22008-06-25 16:01:31 -040085 if (ret < 0)
86 goto out;
87 if (ret > 0) {
88 ret = 0;
89 goto out;
90 }
David Sterbab3b4aa72011-04-21 01:20:15 +020091 btrfs_release_path(path);
Chris Masone7a84562008-06-25 16:01:31 -040092 wret = btrfs_search_slot(trans, root, &key, path, 0, 1);
Chris Mason6702ed42007-08-07 16:15:09 -040093
Chris Masone7a84562008-06-25 16:01:31 -040094 if (wret < 0) {
95 ret = wret;
96 goto out;
Chris Mason6702ed42007-08-07 16:15:09 -040097 }
Chris Masone7a84562008-06-25 16:01:31 -040098 if (!path->nodes[1]) {
99 ret = 0;
100 goto out;
101 }
102 path->slots[1] = btrfs_header_nritems(path->nodes[1]);
Eric Sandeende78b512013-01-31 18:21:12 +0000103 next_key_ret = btrfs_find_next_key(root, path, &key, 1,
Chris Mason3f157a22008-06-25 16:01:31 -0400104 min_trans);
Chris Masone7a84562008-06-25 16:01:31 -0400105 ret = btrfs_realloc_node(trans, root,
106 path->nodes[1], 0,
Eric Sandeende78b512013-01-31 18:21:12 +0000107 &last_ret,
Chris Masone7a84562008-06-25 16:01:31 -0400108 &root->defrag_progress);
Yan, Zheng8929ecfa2010-05-16 10:49:58 -0400109 if (ret) {
110 WARN_ON(ret == -EAGAIN);
111 goto out;
112 }
Chris Masone7a84562008-06-25 16:01:31 -0400113 if (next_key_ret == 0) {
114 memcpy(&root->defrag_progress, &key, sizeof(key));
115 ret = -EAGAIN;
116 }
Chris Mason6702ed42007-08-07 16:15:09 -0400117out:
Tsutomu Itoh527afb42015-08-19 14:55:00 +0900118 btrfs_free_path(path);
Chris Mason0ef3e662008-05-24 14:04:53 -0400119 if (ret == -EAGAIN) {
120 if (root->defrag_max.objectid > root->defrag_progress.objectid)
121 goto done;
122 if (root->defrag_max.type > root->defrag_progress.type)
123 goto done;
124 if (root->defrag_max.offset > root->defrag_progress.offset)
125 goto done;
126 ret = 0;
127 }
128done:
Chris Mason6702ed42007-08-07 16:15:09 -0400129 if (ret != -EAGAIN) {
130 memset(&root->defrag_progress, 0,
131 sizeof(root->defrag_progress));
Chris Mason3f157a22008-06-25 16:01:31 -0400132 root->defrag_trans_start = trans->transid;
Chris Mason6702ed42007-08-07 16:15:09 -0400133 }
134 return ret;
135}