blob: b10eacdb16200e686b3519a46747b706b927761f [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;
39 int orig_level;
Chris Masone9d0b132007-08-10 14:06:19 -040040 int is_extent = 0;
Chris Masone7a84562008-06-25 16:01:31 -040041 int next_key_ret = 0;
Chris Masone9d0b132007-08-10 14:06:19 -040042 u64 last_ret = 0;
Chris Mason3f157a22008-06-25 16:01:31 -040043 u64 min_trans = 0;
44
45 if (cache_only)
46 goto out;
Chris Mason6702ed42007-08-07 16:15:09 -040047
Chris Masone7a84562008-06-25 16:01:31 -040048 if (root->fs_info->extent_root == root) {
Chris Mason1b1e2132008-06-25 16:01:31 -040049 /*
50 * there's recursion here right now in the tree locking,
51 * we can't defrag the extent root without deadlock
52 */
53 goto out;
Chris Masone7a84562008-06-25 16:01:31 -040054 }
Chris Mason925baed2008-06-25 16:01:30 -040055
Chris Masone9d0b132007-08-10 14:06:19 -040056 if (root->ref_cows == 0 && !is_extent)
Chris Mason6702ed42007-08-07 16:15:09 -040057 goto out;
Chris Mason5f39d392007-10-15 16:14:19 -040058
Chris Mason9afbb0b2008-02-15 13:19:35 -050059 if (btrfs_test_opt(root, SSD))
60 goto out;
61
Chris Mason6702ed42007-08-07 16:15:09 -040062 path = btrfs_alloc_path();
63 if (!path)
64 return -ENOMEM;
65
Chris Mason5f39d392007-10-15 16:14:19 -040066 level = btrfs_header_level(root->node);
Chris Mason6702ed42007-08-07 16:15:09 -040067 orig_level = level;
Chris Mason0f1ebbd2007-10-15 16:19:46 -040068
Chris Masond3977122009-01-05 21:25:51 -050069 if (level == 0)
Chris Mason6702ed42007-08-07 16:15:09 -040070 goto out;
Chris Masond3977122009-01-05 21:25:51 -050071
Chris Mason6702ed42007-08-07 16:15:09 -040072 if (root->defrag_progress.objectid == 0) {
Chris Masone7a84562008-06-25 16:01:31 -040073 struct extent_buffer *root_node;
Chris Mason0ef3e662008-05-24 14:04:53 -040074 u32 nritems;
75
Chris Masone7a84562008-06-25 16:01:31 -040076 root_node = btrfs_lock_root_node(root);
Chris Masonb4ce94d2009-02-04 09:25:08 -050077 btrfs_set_lock_blocking(root_node);
Chris Masone7a84562008-06-25 16:01:31 -040078 nritems = btrfs_header_nritems(root_node);
Chris Mason0ef3e662008-05-24 14:04:53 -040079 root->defrag_max.objectid = 0;
80 /* from above we know this is not a leaf */
Chris Masone7a84562008-06-25 16:01:31 -040081 btrfs_node_key_to_cpu(root_node, &root->defrag_max,
Chris Mason0ef3e662008-05-24 14:04:53 -040082 nritems - 1);
Chris Masone7a84562008-06-25 16:01:31 -040083 btrfs_tree_unlock(root_node);
84 free_extent_buffer(root_node);
85 memset(&key, 0, sizeof(key));
Chris Mason6702ed42007-08-07 16:15:09 -040086 } else {
Chris Masone7a84562008-06-25 16:01:31 -040087 memcpy(&key, &root->defrag_progress, sizeof(key));
Chris Mason6702ed42007-08-07 16:15:09 -040088 }
89
Chris Masone7a84562008-06-25 16:01:31 -040090 path->keep_locks = 1;
Chris Mason3f157a22008-06-25 16:01:31 -040091 if (cache_only)
92 min_trans = root->defrag_trans_start;
93
Chris Masone02119d2008-09-05 16:13:11 -040094 ret = btrfs_search_forward(root, &key, NULL, path,
95 cache_only, min_trans);
Chris Mason3f157a22008-06-25 16:01:31 -040096 if (ret < 0)
97 goto out;
98 if (ret > 0) {
99 ret = 0;
100 goto out;
101 }
102 btrfs_release_path(root, path);
Chris Masone7a84562008-06-25 16:01:31 -0400103 wret = btrfs_search_slot(trans, root, &key, path, 0, 1);
Chris Mason6702ed42007-08-07 16:15:09 -0400104
Chris Masone7a84562008-06-25 16:01:31 -0400105 if (wret < 0) {
106 ret = wret;
107 goto out;
Chris Mason6702ed42007-08-07 16:15:09 -0400108 }
Chris Masone7a84562008-06-25 16:01:31 -0400109 if (!path->nodes[1]) {
110 ret = 0;
111 goto out;
112 }
113 path->slots[1] = btrfs_header_nritems(path->nodes[1]);
Chris Mason3f157a22008-06-25 16:01:31 -0400114 next_key_ret = btrfs_find_next_key(root, path, &key, 1, cache_only,
115 min_trans);
Chris Masone7a84562008-06-25 16:01:31 -0400116 ret = btrfs_realloc_node(trans, root,
117 path->nodes[1], 0,
118 cache_only, &last_ret,
119 &root->defrag_progress);
120 WARN_ON(ret && ret != -EAGAIN);
121 if (next_key_ret == 0) {
122 memcpy(&root->defrag_progress, &key, sizeof(key));
123 ret = -EAGAIN;
124 }
125
Chris Mason3f157a22008-06-25 16:01:31 -0400126 btrfs_release_path(root, path);
Chris Mason6702ed42007-08-07 16:15:09 -0400127out:
128 if (path)
129 btrfs_free_path(path);
Chris Mason0ef3e662008-05-24 14:04:53 -0400130 if (ret == -EAGAIN) {
131 if (root->defrag_max.objectid > root->defrag_progress.objectid)
132 goto done;
133 if (root->defrag_max.type > root->defrag_progress.type)
134 goto done;
135 if (root->defrag_max.offset > root->defrag_progress.offset)
136 goto done;
137 ret = 0;
138 }
139done:
Chris Mason6702ed42007-08-07 16:15:09 -0400140 if (ret != -EAGAIN) {
141 memset(&root->defrag_progress, 0,
142 sizeof(root->defrag_progress));
Chris Mason3f157a22008-06-25 16:01:31 -0400143 root->defrag_trans_start = trans->transid;
Chris Mason6702ed42007-08-07 16:15:09 -0400144 }
145 return ret;
146}