140 lines
3.3 KiB
C
140 lines
3.3 KiB
C
/*
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* Copyright (C) 2007 Oracle. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License v2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 021110-1307, USA.
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*/
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#include <linux/sched.h>
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#include "ctree.h"
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#include "disk-io.h"
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#include "print-tree.h"
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#include "transaction.h"
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#include "locking.h"
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/*
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* Defrag all the leaves in a given btree.
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* Read all the leaves and try to get key order to
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* better reflect disk order
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*/
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int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
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struct btrfs_root *root)
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{
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struct btrfs_path *path = NULL;
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struct btrfs_key key;
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int ret = 0;
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int wret;
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int level;
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int next_key_ret = 0;
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u64 last_ret = 0;
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u64 min_trans = 0;
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if (root->fs_info->extent_root == root) {
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/*
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* there's recursion here right now in the tree locking,
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* we can't defrag the extent root without deadlock
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*/
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goto out;
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}
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if (!test_bit(BTRFS_ROOT_REF_COWS, &root->state))
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goto out;
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if (btrfs_test_opt(root, SSD))
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goto out;
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path = btrfs_alloc_path();
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if (!path)
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return -ENOMEM;
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level = btrfs_header_level(root->node);
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if (level == 0)
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goto out;
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if (root->defrag_progress.objectid == 0) {
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struct extent_buffer *root_node;
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u32 nritems;
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root_node = btrfs_lock_root_node(root);
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btrfs_set_lock_blocking(root_node);
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nritems = btrfs_header_nritems(root_node);
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root->defrag_max.objectid = 0;
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/* from above we know this is not a leaf */
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btrfs_node_key_to_cpu(root_node, &root->defrag_max,
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nritems - 1);
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btrfs_tree_unlock(root_node);
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free_extent_buffer(root_node);
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memset(&key, 0, sizeof(key));
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} else {
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memcpy(&key, &root->defrag_progress, sizeof(key));
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}
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path->keep_locks = 1;
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ret = btrfs_search_forward(root, &key, path, min_trans);
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if (ret < 0)
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goto out;
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if (ret > 0) {
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ret = 0;
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goto out;
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}
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btrfs_release_path(path);
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wret = btrfs_search_slot(trans, root, &key, path, 0, 1);
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if (wret < 0) {
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ret = wret;
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goto out;
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}
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if (!path->nodes[1]) {
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ret = 0;
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goto out;
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}
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path->slots[1] = btrfs_header_nritems(path->nodes[1]);
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next_key_ret = btrfs_find_next_key(root, path, &key, 1,
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min_trans);
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ret = btrfs_realloc_node(trans, root,
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path->nodes[1], 0,
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&last_ret,
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&root->defrag_progress);
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if (ret) {
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WARN_ON(ret == -EAGAIN);
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goto out;
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}
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if (next_key_ret == 0) {
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memcpy(&root->defrag_progress, &key, sizeof(key));
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ret = -EAGAIN;
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}
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out:
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if (path)
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btrfs_free_path(path);
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if (ret == -EAGAIN) {
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if (root->defrag_max.objectid > root->defrag_progress.objectid)
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goto done;
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if (root->defrag_max.type > root->defrag_progress.type)
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goto done;
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if (root->defrag_max.offset > root->defrag_progress.offset)
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goto done;
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ret = 0;
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}
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done:
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if (ret != -EAGAIN) {
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memset(&root->defrag_progress, 0,
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sizeof(root->defrag_progress));
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root->defrag_trans_start = trans->transid;
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}
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return ret;
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}
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