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![David Sterba](/assets/img/avatar_default.png)
Use the wrappers and reduce the amount of low-level details about the waitqueue management. Reviewed-by: Nikolay Borisov <nborisov@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
1969 lines
51 KiB
C
1969 lines
51 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2011 Fujitsu. All rights reserved.
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* Written by Miao Xie <miaox@cn.fujitsu.com>
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*/
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#include <linux/slab.h>
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#include <linux/iversion.h>
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#include "delayed-inode.h"
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#include "disk-io.h"
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#include "transaction.h"
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#include "ctree.h"
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#include "qgroup.h"
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#define BTRFS_DELAYED_WRITEBACK 512
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#define BTRFS_DELAYED_BACKGROUND 128
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#define BTRFS_DELAYED_BATCH 16
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static struct kmem_cache *delayed_node_cache;
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int __init btrfs_delayed_inode_init(void)
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{
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delayed_node_cache = kmem_cache_create("btrfs_delayed_node",
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sizeof(struct btrfs_delayed_node),
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0,
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SLAB_MEM_SPREAD,
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NULL);
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if (!delayed_node_cache)
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return -ENOMEM;
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return 0;
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}
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void __cold btrfs_delayed_inode_exit(void)
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{
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kmem_cache_destroy(delayed_node_cache);
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}
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static inline void btrfs_init_delayed_node(
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struct btrfs_delayed_node *delayed_node,
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struct btrfs_root *root, u64 inode_id)
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{
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delayed_node->root = root;
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delayed_node->inode_id = inode_id;
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refcount_set(&delayed_node->refs, 0);
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delayed_node->ins_root = RB_ROOT;
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delayed_node->del_root = RB_ROOT;
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mutex_init(&delayed_node->mutex);
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INIT_LIST_HEAD(&delayed_node->n_list);
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INIT_LIST_HEAD(&delayed_node->p_list);
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}
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static inline int btrfs_is_continuous_delayed_item(
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struct btrfs_delayed_item *item1,
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struct btrfs_delayed_item *item2)
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{
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if (item1->key.type == BTRFS_DIR_INDEX_KEY &&
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item1->key.objectid == item2->key.objectid &&
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item1->key.type == item2->key.type &&
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item1->key.offset + 1 == item2->key.offset)
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return 1;
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return 0;
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}
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static struct btrfs_delayed_node *btrfs_get_delayed_node(
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struct btrfs_inode *btrfs_inode)
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{
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struct btrfs_root *root = btrfs_inode->root;
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u64 ino = btrfs_ino(btrfs_inode);
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struct btrfs_delayed_node *node;
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node = READ_ONCE(btrfs_inode->delayed_node);
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if (node) {
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refcount_inc(&node->refs);
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return node;
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}
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spin_lock(&root->inode_lock);
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node = radix_tree_lookup(&root->delayed_nodes_tree, ino);
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if (node) {
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if (btrfs_inode->delayed_node) {
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refcount_inc(&node->refs); /* can be accessed */
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BUG_ON(btrfs_inode->delayed_node != node);
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spin_unlock(&root->inode_lock);
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return node;
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}
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/*
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* It's possible that we're racing into the middle of removing
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* this node from the radix tree. In this case, the refcount
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* was zero and it should never go back to one. Just return
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* NULL like it was never in the radix at all; our release
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* function is in the process of removing it.
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*
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* Some implementations of refcount_inc refuse to bump the
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* refcount once it has hit zero. If we don't do this dance
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* here, refcount_inc() may decide to just WARN_ONCE() instead
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* of actually bumping the refcount.
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*
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* If this node is properly in the radix, we want to bump the
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* refcount twice, once for the inode and once for this get
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* operation.
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*/
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if (refcount_inc_not_zero(&node->refs)) {
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refcount_inc(&node->refs);
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btrfs_inode->delayed_node = node;
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} else {
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node = NULL;
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}
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spin_unlock(&root->inode_lock);
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return node;
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}
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spin_unlock(&root->inode_lock);
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return NULL;
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}
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/* Will return either the node or PTR_ERR(-ENOMEM) */
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static struct btrfs_delayed_node *btrfs_get_or_create_delayed_node(
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struct btrfs_inode *btrfs_inode)
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{
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struct btrfs_delayed_node *node;
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struct btrfs_root *root = btrfs_inode->root;
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u64 ino = btrfs_ino(btrfs_inode);
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int ret;
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again:
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node = btrfs_get_delayed_node(btrfs_inode);
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if (node)
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return node;
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node = kmem_cache_zalloc(delayed_node_cache, GFP_NOFS);
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if (!node)
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return ERR_PTR(-ENOMEM);
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btrfs_init_delayed_node(node, root, ino);
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/* cached in the btrfs inode and can be accessed */
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refcount_set(&node->refs, 2);
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ret = radix_tree_preload(GFP_NOFS);
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if (ret) {
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kmem_cache_free(delayed_node_cache, node);
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return ERR_PTR(ret);
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}
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spin_lock(&root->inode_lock);
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ret = radix_tree_insert(&root->delayed_nodes_tree, ino, node);
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if (ret == -EEXIST) {
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spin_unlock(&root->inode_lock);
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kmem_cache_free(delayed_node_cache, node);
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radix_tree_preload_end();
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goto again;
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}
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btrfs_inode->delayed_node = node;
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spin_unlock(&root->inode_lock);
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radix_tree_preload_end();
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return node;
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}
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/*
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* Call it when holding delayed_node->mutex
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*
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* If mod = 1, add this node into the prepared list.
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*/
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static void btrfs_queue_delayed_node(struct btrfs_delayed_root *root,
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struct btrfs_delayed_node *node,
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int mod)
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{
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spin_lock(&root->lock);
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if (test_bit(BTRFS_DELAYED_NODE_IN_LIST, &node->flags)) {
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if (!list_empty(&node->p_list))
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list_move_tail(&node->p_list, &root->prepare_list);
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else if (mod)
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list_add_tail(&node->p_list, &root->prepare_list);
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} else {
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list_add_tail(&node->n_list, &root->node_list);
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list_add_tail(&node->p_list, &root->prepare_list);
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refcount_inc(&node->refs); /* inserted into list */
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root->nodes++;
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set_bit(BTRFS_DELAYED_NODE_IN_LIST, &node->flags);
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}
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spin_unlock(&root->lock);
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}
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/* Call it when holding delayed_node->mutex */
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static void btrfs_dequeue_delayed_node(struct btrfs_delayed_root *root,
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struct btrfs_delayed_node *node)
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{
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spin_lock(&root->lock);
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if (test_bit(BTRFS_DELAYED_NODE_IN_LIST, &node->flags)) {
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root->nodes--;
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refcount_dec(&node->refs); /* not in the list */
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list_del_init(&node->n_list);
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if (!list_empty(&node->p_list))
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list_del_init(&node->p_list);
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clear_bit(BTRFS_DELAYED_NODE_IN_LIST, &node->flags);
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}
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spin_unlock(&root->lock);
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}
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static struct btrfs_delayed_node *btrfs_first_delayed_node(
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struct btrfs_delayed_root *delayed_root)
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{
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struct list_head *p;
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struct btrfs_delayed_node *node = NULL;
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spin_lock(&delayed_root->lock);
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if (list_empty(&delayed_root->node_list))
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goto out;
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p = delayed_root->node_list.next;
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node = list_entry(p, struct btrfs_delayed_node, n_list);
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refcount_inc(&node->refs);
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out:
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spin_unlock(&delayed_root->lock);
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return node;
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}
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static struct btrfs_delayed_node *btrfs_next_delayed_node(
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struct btrfs_delayed_node *node)
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{
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struct btrfs_delayed_root *delayed_root;
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struct list_head *p;
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struct btrfs_delayed_node *next = NULL;
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delayed_root = node->root->fs_info->delayed_root;
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spin_lock(&delayed_root->lock);
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if (!test_bit(BTRFS_DELAYED_NODE_IN_LIST, &node->flags)) {
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/* not in the list */
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if (list_empty(&delayed_root->node_list))
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goto out;
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p = delayed_root->node_list.next;
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} else if (list_is_last(&node->n_list, &delayed_root->node_list))
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goto out;
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else
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p = node->n_list.next;
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next = list_entry(p, struct btrfs_delayed_node, n_list);
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refcount_inc(&next->refs);
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out:
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spin_unlock(&delayed_root->lock);
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return next;
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}
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static void __btrfs_release_delayed_node(
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struct btrfs_delayed_node *delayed_node,
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int mod)
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{
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struct btrfs_delayed_root *delayed_root;
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if (!delayed_node)
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return;
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delayed_root = delayed_node->root->fs_info->delayed_root;
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mutex_lock(&delayed_node->mutex);
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if (delayed_node->count)
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btrfs_queue_delayed_node(delayed_root, delayed_node, mod);
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else
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btrfs_dequeue_delayed_node(delayed_root, delayed_node);
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mutex_unlock(&delayed_node->mutex);
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if (refcount_dec_and_test(&delayed_node->refs)) {
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struct btrfs_root *root = delayed_node->root;
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spin_lock(&root->inode_lock);
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/*
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* Once our refcount goes to zero, nobody is allowed to bump it
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* back up. We can delete it now.
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*/
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ASSERT(refcount_read(&delayed_node->refs) == 0);
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radix_tree_delete(&root->delayed_nodes_tree,
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delayed_node->inode_id);
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spin_unlock(&root->inode_lock);
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kmem_cache_free(delayed_node_cache, delayed_node);
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}
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}
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static inline void btrfs_release_delayed_node(struct btrfs_delayed_node *node)
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{
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__btrfs_release_delayed_node(node, 0);
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}
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static struct btrfs_delayed_node *btrfs_first_prepared_delayed_node(
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struct btrfs_delayed_root *delayed_root)
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{
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struct list_head *p;
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struct btrfs_delayed_node *node = NULL;
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spin_lock(&delayed_root->lock);
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if (list_empty(&delayed_root->prepare_list))
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goto out;
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p = delayed_root->prepare_list.next;
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list_del_init(p);
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node = list_entry(p, struct btrfs_delayed_node, p_list);
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refcount_inc(&node->refs);
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out:
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spin_unlock(&delayed_root->lock);
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return node;
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}
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static inline void btrfs_release_prepared_delayed_node(
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struct btrfs_delayed_node *node)
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{
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__btrfs_release_delayed_node(node, 1);
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}
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static struct btrfs_delayed_item *btrfs_alloc_delayed_item(u32 data_len)
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{
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struct btrfs_delayed_item *item;
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item = kmalloc(sizeof(*item) + data_len, GFP_NOFS);
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if (item) {
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item->data_len = data_len;
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item->ins_or_del = 0;
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item->bytes_reserved = 0;
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item->delayed_node = NULL;
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refcount_set(&item->refs, 1);
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}
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return item;
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}
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/*
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* __btrfs_lookup_delayed_item - look up the delayed item by key
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* @delayed_node: pointer to the delayed node
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* @key: the key to look up
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* @prev: used to store the prev item if the right item isn't found
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* @next: used to store the next item if the right item isn't found
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*
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* Note: if we don't find the right item, we will return the prev item and
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* the next item.
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*/
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static struct btrfs_delayed_item *__btrfs_lookup_delayed_item(
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struct rb_root *root,
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struct btrfs_key *key,
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struct btrfs_delayed_item **prev,
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struct btrfs_delayed_item **next)
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{
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struct rb_node *node, *prev_node = NULL;
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struct btrfs_delayed_item *delayed_item = NULL;
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int ret = 0;
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node = root->rb_node;
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while (node) {
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delayed_item = rb_entry(node, struct btrfs_delayed_item,
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rb_node);
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prev_node = node;
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ret = btrfs_comp_cpu_keys(&delayed_item->key, key);
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if (ret < 0)
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node = node->rb_right;
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else if (ret > 0)
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node = node->rb_left;
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else
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return delayed_item;
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}
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if (prev) {
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if (!prev_node)
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*prev = NULL;
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else if (ret < 0)
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*prev = delayed_item;
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else if ((node = rb_prev(prev_node)) != NULL) {
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*prev = rb_entry(node, struct btrfs_delayed_item,
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rb_node);
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} else
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*prev = NULL;
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}
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if (next) {
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if (!prev_node)
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*next = NULL;
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else if (ret > 0)
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*next = delayed_item;
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else if ((node = rb_next(prev_node)) != NULL) {
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*next = rb_entry(node, struct btrfs_delayed_item,
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rb_node);
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} else
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*next = NULL;
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}
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return NULL;
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}
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static struct btrfs_delayed_item *__btrfs_lookup_delayed_insertion_item(
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struct btrfs_delayed_node *delayed_node,
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struct btrfs_key *key)
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{
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return __btrfs_lookup_delayed_item(&delayed_node->ins_root, key,
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NULL, NULL);
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}
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static int __btrfs_add_delayed_item(struct btrfs_delayed_node *delayed_node,
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struct btrfs_delayed_item *ins,
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int action)
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{
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struct rb_node **p, *node;
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struct rb_node *parent_node = NULL;
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struct rb_root *root;
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struct btrfs_delayed_item *item;
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int cmp;
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if (action == BTRFS_DELAYED_INSERTION_ITEM)
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root = &delayed_node->ins_root;
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else if (action == BTRFS_DELAYED_DELETION_ITEM)
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root = &delayed_node->del_root;
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else
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BUG();
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p = &root->rb_node;
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node = &ins->rb_node;
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while (*p) {
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parent_node = *p;
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item = rb_entry(parent_node, struct btrfs_delayed_item,
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rb_node);
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cmp = btrfs_comp_cpu_keys(&item->key, &ins->key);
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if (cmp < 0)
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p = &(*p)->rb_right;
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else if (cmp > 0)
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p = &(*p)->rb_left;
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else
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return -EEXIST;
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}
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rb_link_node(node, parent_node, p);
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rb_insert_color(node, root);
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ins->delayed_node = delayed_node;
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ins->ins_or_del = action;
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if (ins->key.type == BTRFS_DIR_INDEX_KEY &&
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action == BTRFS_DELAYED_INSERTION_ITEM &&
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ins->key.offset >= delayed_node->index_cnt)
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delayed_node->index_cnt = ins->key.offset + 1;
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delayed_node->count++;
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atomic_inc(&delayed_node->root->fs_info->delayed_root->items);
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return 0;
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}
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static int __btrfs_add_delayed_insertion_item(struct btrfs_delayed_node *node,
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struct btrfs_delayed_item *item)
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{
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return __btrfs_add_delayed_item(node, item,
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BTRFS_DELAYED_INSERTION_ITEM);
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}
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static int __btrfs_add_delayed_deletion_item(struct btrfs_delayed_node *node,
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struct btrfs_delayed_item *item)
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{
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return __btrfs_add_delayed_item(node, item,
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BTRFS_DELAYED_DELETION_ITEM);
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}
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static void finish_one_item(struct btrfs_delayed_root *delayed_root)
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{
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int seq = atomic_inc_return(&delayed_root->items_seq);
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/* atomic_dec_return implies a barrier */
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if ((atomic_dec_return(&delayed_root->items) <
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BTRFS_DELAYED_BACKGROUND || seq % BTRFS_DELAYED_BATCH == 0))
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cond_wake_up_nomb(&delayed_root->wait);
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}
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static void __btrfs_remove_delayed_item(struct btrfs_delayed_item *delayed_item)
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{
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struct rb_root *root;
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struct btrfs_delayed_root *delayed_root;
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delayed_root = delayed_item->delayed_node->root->fs_info->delayed_root;
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BUG_ON(!delayed_root);
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BUG_ON(delayed_item->ins_or_del != BTRFS_DELAYED_DELETION_ITEM &&
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delayed_item->ins_or_del != BTRFS_DELAYED_INSERTION_ITEM);
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if (delayed_item->ins_or_del == BTRFS_DELAYED_INSERTION_ITEM)
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root = &delayed_item->delayed_node->ins_root;
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else
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root = &delayed_item->delayed_node->del_root;
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rb_erase(&delayed_item->rb_node, root);
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delayed_item->delayed_node->count--;
|
|
|
|
finish_one_item(delayed_root);
|
|
}
|
|
|
|
static void btrfs_release_delayed_item(struct btrfs_delayed_item *item)
|
|
{
|
|
if (item) {
|
|
__btrfs_remove_delayed_item(item);
|
|
if (refcount_dec_and_test(&item->refs))
|
|
kfree(item);
|
|
}
|
|
}
|
|
|
|
static struct btrfs_delayed_item *__btrfs_first_delayed_insertion_item(
|
|
struct btrfs_delayed_node *delayed_node)
|
|
{
|
|
struct rb_node *p;
|
|
struct btrfs_delayed_item *item = NULL;
|
|
|
|
p = rb_first(&delayed_node->ins_root);
|
|
if (p)
|
|
item = rb_entry(p, struct btrfs_delayed_item, rb_node);
|
|
|
|
return item;
|
|
}
|
|
|
|
static struct btrfs_delayed_item *__btrfs_first_delayed_deletion_item(
|
|
struct btrfs_delayed_node *delayed_node)
|
|
{
|
|
struct rb_node *p;
|
|
struct btrfs_delayed_item *item = NULL;
|
|
|
|
p = rb_first(&delayed_node->del_root);
|
|
if (p)
|
|
item = rb_entry(p, struct btrfs_delayed_item, rb_node);
|
|
|
|
return item;
|
|
}
|
|
|
|
static struct btrfs_delayed_item *__btrfs_next_delayed_item(
|
|
struct btrfs_delayed_item *item)
|
|
{
|
|
struct rb_node *p;
|
|
struct btrfs_delayed_item *next = NULL;
|
|
|
|
p = rb_next(&item->rb_node);
|
|
if (p)
|
|
next = rb_entry(p, struct btrfs_delayed_item, rb_node);
|
|
|
|
return next;
|
|
}
|
|
|
|
static int btrfs_delayed_item_reserve_metadata(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root,
|
|
struct btrfs_delayed_item *item)
|
|
{
|
|
struct btrfs_block_rsv *src_rsv;
|
|
struct btrfs_block_rsv *dst_rsv;
|
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
|
u64 num_bytes;
|
|
int ret;
|
|
|
|
if (!trans->bytes_reserved)
|
|
return 0;
|
|
|
|
src_rsv = trans->block_rsv;
|
|
dst_rsv = &fs_info->delayed_block_rsv;
|
|
|
|
num_bytes = btrfs_calc_trans_metadata_size(fs_info, 1);
|
|
|
|
/*
|
|
* Here we migrate space rsv from transaction rsv, since have already
|
|
* reserved space when starting a transaction. So no need to reserve
|
|
* qgroup space here.
|
|
*/
|
|
ret = btrfs_block_rsv_migrate(src_rsv, dst_rsv, num_bytes, 1);
|
|
if (!ret) {
|
|
trace_btrfs_space_reservation(fs_info, "delayed_item",
|
|
item->key.objectid,
|
|
num_bytes, 1);
|
|
item->bytes_reserved = num_bytes;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void btrfs_delayed_item_release_metadata(struct btrfs_root *root,
|
|
struct btrfs_delayed_item *item)
|
|
{
|
|
struct btrfs_block_rsv *rsv;
|
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
|
|
|
if (!item->bytes_reserved)
|
|
return;
|
|
|
|
rsv = &fs_info->delayed_block_rsv;
|
|
/*
|
|
* Check btrfs_delayed_item_reserve_metadata() to see why we don't need
|
|
* to release/reserve qgroup space.
|
|
*/
|
|
trace_btrfs_space_reservation(fs_info, "delayed_item",
|
|
item->key.objectid, item->bytes_reserved,
|
|
0);
|
|
btrfs_block_rsv_release(fs_info, rsv,
|
|
item->bytes_reserved);
|
|
}
|
|
|
|
static int btrfs_delayed_inode_reserve_metadata(
|
|
struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root,
|
|
struct btrfs_inode *inode,
|
|
struct btrfs_delayed_node *node)
|
|
{
|
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
|
struct btrfs_block_rsv *src_rsv;
|
|
struct btrfs_block_rsv *dst_rsv;
|
|
u64 num_bytes;
|
|
int ret;
|
|
|
|
src_rsv = trans->block_rsv;
|
|
dst_rsv = &fs_info->delayed_block_rsv;
|
|
|
|
num_bytes = btrfs_calc_trans_metadata_size(fs_info, 1);
|
|
|
|
/*
|
|
* btrfs_dirty_inode will update the inode under btrfs_join_transaction
|
|
* which doesn't reserve space for speed. This is a problem since we
|
|
* still need to reserve space for this update, so try to reserve the
|
|
* space.
|
|
*
|
|
* Now if src_rsv == delalloc_block_rsv we'll let it just steal since
|
|
* we always reserve enough to update the inode item.
|
|
*/
|
|
if (!src_rsv || (!trans->bytes_reserved &&
|
|
src_rsv->type != BTRFS_BLOCK_RSV_DELALLOC)) {
|
|
ret = btrfs_qgroup_reserve_meta_prealloc(root,
|
|
fs_info->nodesize, true);
|
|
if (ret < 0)
|
|
return ret;
|
|
ret = btrfs_block_rsv_add(root, dst_rsv, num_bytes,
|
|
BTRFS_RESERVE_NO_FLUSH);
|
|
/*
|
|
* Since we're under a transaction reserve_metadata_bytes could
|
|
* try to commit the transaction which will make it return
|
|
* EAGAIN to make us stop the transaction we have, so return
|
|
* ENOSPC instead so that btrfs_dirty_inode knows what to do.
|
|
*/
|
|
if (ret == -EAGAIN) {
|
|
ret = -ENOSPC;
|
|
btrfs_qgroup_free_meta_prealloc(root, num_bytes);
|
|
}
|
|
if (!ret) {
|
|
node->bytes_reserved = num_bytes;
|
|
trace_btrfs_space_reservation(fs_info,
|
|
"delayed_inode",
|
|
btrfs_ino(inode),
|
|
num_bytes, 1);
|
|
} else {
|
|
btrfs_qgroup_free_meta_prealloc(root, fs_info->nodesize);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
ret = btrfs_block_rsv_migrate(src_rsv, dst_rsv, num_bytes, 1);
|
|
if (!ret) {
|
|
trace_btrfs_space_reservation(fs_info, "delayed_inode",
|
|
btrfs_ino(inode), num_bytes, 1);
|
|
node->bytes_reserved = num_bytes;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void btrfs_delayed_inode_release_metadata(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_delayed_node *node,
|
|
bool qgroup_free)
|
|
{
|
|
struct btrfs_block_rsv *rsv;
|
|
|
|
if (!node->bytes_reserved)
|
|
return;
|
|
|
|
rsv = &fs_info->delayed_block_rsv;
|
|
trace_btrfs_space_reservation(fs_info, "delayed_inode",
|
|
node->inode_id, node->bytes_reserved, 0);
|
|
btrfs_block_rsv_release(fs_info, rsv,
|
|
node->bytes_reserved);
|
|
if (qgroup_free)
|
|
btrfs_qgroup_free_meta_prealloc(node->root,
|
|
node->bytes_reserved);
|
|
else
|
|
btrfs_qgroup_convert_reserved_meta(node->root,
|
|
node->bytes_reserved);
|
|
node->bytes_reserved = 0;
|
|
}
|
|
|
|
/*
|
|
* This helper will insert some continuous items into the same leaf according
|
|
* to the free space of the leaf.
|
|
*/
|
|
static int btrfs_batch_insert_items(struct btrfs_root *root,
|
|
struct btrfs_path *path,
|
|
struct btrfs_delayed_item *item)
|
|
{
|
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
|
struct btrfs_delayed_item *curr, *next;
|
|
int free_space;
|
|
int total_data_size = 0, total_size = 0;
|
|
struct extent_buffer *leaf;
|
|
char *data_ptr;
|
|
struct btrfs_key *keys;
|
|
u32 *data_size;
|
|
struct list_head head;
|
|
int slot;
|
|
int nitems;
|
|
int i;
|
|
int ret = 0;
|
|
|
|
BUG_ON(!path->nodes[0]);
|
|
|
|
leaf = path->nodes[0];
|
|
free_space = btrfs_leaf_free_space(fs_info, leaf);
|
|
INIT_LIST_HEAD(&head);
|
|
|
|
next = item;
|
|
nitems = 0;
|
|
|
|
/*
|
|
* count the number of the continuous items that we can insert in batch
|
|
*/
|
|
while (total_size + next->data_len + sizeof(struct btrfs_item) <=
|
|
free_space) {
|
|
total_data_size += next->data_len;
|
|
total_size += next->data_len + sizeof(struct btrfs_item);
|
|
list_add_tail(&next->tree_list, &head);
|
|
nitems++;
|
|
|
|
curr = next;
|
|
next = __btrfs_next_delayed_item(curr);
|
|
if (!next)
|
|
break;
|
|
|
|
if (!btrfs_is_continuous_delayed_item(curr, next))
|
|
break;
|
|
}
|
|
|
|
if (!nitems) {
|
|
ret = 0;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* we need allocate some memory space, but it might cause the task
|
|
* to sleep, so we set all locked nodes in the path to blocking locks
|
|
* first.
|
|
*/
|
|
btrfs_set_path_blocking(path);
|
|
|
|
keys = kmalloc_array(nitems, sizeof(struct btrfs_key), GFP_NOFS);
|
|
if (!keys) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
data_size = kmalloc_array(nitems, sizeof(u32), GFP_NOFS);
|
|
if (!data_size) {
|
|
ret = -ENOMEM;
|
|
goto error;
|
|
}
|
|
|
|
/* get keys of all the delayed items */
|
|
i = 0;
|
|
list_for_each_entry(next, &head, tree_list) {
|
|
keys[i] = next->key;
|
|
data_size[i] = next->data_len;
|
|
i++;
|
|
}
|
|
|
|
/* reset all the locked nodes in the patch to spinning locks. */
|
|
btrfs_clear_path_blocking(path, NULL, 0);
|
|
|
|
/* insert the keys of the items */
|
|
setup_items_for_insert(root, path, keys, data_size,
|
|
total_data_size, total_size, nitems);
|
|
|
|
/* insert the dir index items */
|
|
slot = path->slots[0];
|
|
list_for_each_entry_safe(curr, next, &head, tree_list) {
|
|
data_ptr = btrfs_item_ptr(leaf, slot, char);
|
|
write_extent_buffer(leaf, &curr->data,
|
|
(unsigned long)data_ptr,
|
|
curr->data_len);
|
|
slot++;
|
|
|
|
btrfs_delayed_item_release_metadata(root, curr);
|
|
|
|
list_del(&curr->tree_list);
|
|
btrfs_release_delayed_item(curr);
|
|
}
|
|
|
|
error:
|
|
kfree(data_size);
|
|
kfree(keys);
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* This helper can just do simple insertion that needn't extend item for new
|
|
* data, such as directory name index insertion, inode insertion.
|
|
*/
|
|
static int btrfs_insert_delayed_item(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root,
|
|
struct btrfs_path *path,
|
|
struct btrfs_delayed_item *delayed_item)
|
|
{
|
|
struct extent_buffer *leaf;
|
|
char *ptr;
|
|
int ret;
|
|
|
|
ret = btrfs_insert_empty_item(trans, root, path, &delayed_item->key,
|
|
delayed_item->data_len);
|
|
if (ret < 0 && ret != -EEXIST)
|
|
return ret;
|
|
|
|
leaf = path->nodes[0];
|
|
|
|
ptr = btrfs_item_ptr(leaf, path->slots[0], char);
|
|
|
|
write_extent_buffer(leaf, delayed_item->data, (unsigned long)ptr,
|
|
delayed_item->data_len);
|
|
btrfs_mark_buffer_dirty(leaf);
|
|
|
|
btrfs_delayed_item_release_metadata(root, delayed_item);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* we insert an item first, then if there are some continuous items, we try
|
|
* to insert those items into the same leaf.
|
|
*/
|
|
static int btrfs_insert_delayed_items(struct btrfs_trans_handle *trans,
|
|
struct btrfs_path *path,
|
|
struct btrfs_root *root,
|
|
struct btrfs_delayed_node *node)
|
|
{
|
|
struct btrfs_delayed_item *curr, *prev;
|
|
int ret = 0;
|
|
|
|
do_again:
|
|
mutex_lock(&node->mutex);
|
|
curr = __btrfs_first_delayed_insertion_item(node);
|
|
if (!curr)
|
|
goto insert_end;
|
|
|
|
ret = btrfs_insert_delayed_item(trans, root, path, curr);
|
|
if (ret < 0) {
|
|
btrfs_release_path(path);
|
|
goto insert_end;
|
|
}
|
|
|
|
prev = curr;
|
|
curr = __btrfs_next_delayed_item(prev);
|
|
if (curr && btrfs_is_continuous_delayed_item(prev, curr)) {
|
|
/* insert the continuous items into the same leaf */
|
|
path->slots[0]++;
|
|
btrfs_batch_insert_items(root, path, curr);
|
|
}
|
|
btrfs_release_delayed_item(prev);
|
|
btrfs_mark_buffer_dirty(path->nodes[0]);
|
|
|
|
btrfs_release_path(path);
|
|
mutex_unlock(&node->mutex);
|
|
goto do_again;
|
|
|
|
insert_end:
|
|
mutex_unlock(&node->mutex);
|
|
return ret;
|
|
}
|
|
|
|
static int btrfs_batch_delete_items(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root,
|
|
struct btrfs_path *path,
|
|
struct btrfs_delayed_item *item)
|
|
{
|
|
struct btrfs_delayed_item *curr, *next;
|
|
struct extent_buffer *leaf;
|
|
struct btrfs_key key;
|
|
struct list_head head;
|
|
int nitems, i, last_item;
|
|
int ret = 0;
|
|
|
|
BUG_ON(!path->nodes[0]);
|
|
|
|
leaf = path->nodes[0];
|
|
|
|
i = path->slots[0];
|
|
last_item = btrfs_header_nritems(leaf) - 1;
|
|
if (i > last_item)
|
|
return -ENOENT; /* FIXME: Is errno suitable? */
|
|
|
|
next = item;
|
|
INIT_LIST_HEAD(&head);
|
|
btrfs_item_key_to_cpu(leaf, &key, i);
|
|
nitems = 0;
|
|
/*
|
|
* count the number of the dir index items that we can delete in batch
|
|
*/
|
|
while (btrfs_comp_cpu_keys(&next->key, &key) == 0) {
|
|
list_add_tail(&next->tree_list, &head);
|
|
nitems++;
|
|
|
|
curr = next;
|
|
next = __btrfs_next_delayed_item(curr);
|
|
if (!next)
|
|
break;
|
|
|
|
if (!btrfs_is_continuous_delayed_item(curr, next))
|
|
break;
|
|
|
|
i++;
|
|
if (i > last_item)
|
|
break;
|
|
btrfs_item_key_to_cpu(leaf, &key, i);
|
|
}
|
|
|
|
if (!nitems)
|
|
return 0;
|
|
|
|
ret = btrfs_del_items(trans, root, path, path->slots[0], nitems);
|
|
if (ret)
|
|
goto out;
|
|
|
|
list_for_each_entry_safe(curr, next, &head, tree_list) {
|
|
btrfs_delayed_item_release_metadata(root, curr);
|
|
list_del(&curr->tree_list);
|
|
btrfs_release_delayed_item(curr);
|
|
}
|
|
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static int btrfs_delete_delayed_items(struct btrfs_trans_handle *trans,
|
|
struct btrfs_path *path,
|
|
struct btrfs_root *root,
|
|
struct btrfs_delayed_node *node)
|
|
{
|
|
struct btrfs_delayed_item *curr, *prev;
|
|
int ret = 0;
|
|
|
|
do_again:
|
|
mutex_lock(&node->mutex);
|
|
curr = __btrfs_first_delayed_deletion_item(node);
|
|
if (!curr)
|
|
goto delete_fail;
|
|
|
|
ret = btrfs_search_slot(trans, root, &curr->key, path, -1, 1);
|
|
if (ret < 0)
|
|
goto delete_fail;
|
|
else if (ret > 0) {
|
|
/*
|
|
* can't find the item which the node points to, so this node
|
|
* is invalid, just drop it.
|
|
*/
|
|
prev = curr;
|
|
curr = __btrfs_next_delayed_item(prev);
|
|
btrfs_release_delayed_item(prev);
|
|
ret = 0;
|
|
btrfs_release_path(path);
|
|
if (curr) {
|
|
mutex_unlock(&node->mutex);
|
|
goto do_again;
|
|
} else
|
|
goto delete_fail;
|
|
}
|
|
|
|
btrfs_batch_delete_items(trans, root, path, curr);
|
|
btrfs_release_path(path);
|
|
mutex_unlock(&node->mutex);
|
|
goto do_again;
|
|
|
|
delete_fail:
|
|
btrfs_release_path(path);
|
|
mutex_unlock(&node->mutex);
|
|
return ret;
|
|
}
|
|
|
|
static void btrfs_release_delayed_inode(struct btrfs_delayed_node *delayed_node)
|
|
{
|
|
struct btrfs_delayed_root *delayed_root;
|
|
|
|
if (delayed_node &&
|
|
test_bit(BTRFS_DELAYED_NODE_INODE_DIRTY, &delayed_node->flags)) {
|
|
BUG_ON(!delayed_node->root);
|
|
clear_bit(BTRFS_DELAYED_NODE_INODE_DIRTY, &delayed_node->flags);
|
|
delayed_node->count--;
|
|
|
|
delayed_root = delayed_node->root->fs_info->delayed_root;
|
|
finish_one_item(delayed_root);
|
|
}
|
|
}
|
|
|
|
static void btrfs_release_delayed_iref(struct btrfs_delayed_node *delayed_node)
|
|
{
|
|
struct btrfs_delayed_root *delayed_root;
|
|
|
|
ASSERT(delayed_node->root);
|
|
clear_bit(BTRFS_DELAYED_NODE_DEL_IREF, &delayed_node->flags);
|
|
delayed_node->count--;
|
|
|
|
delayed_root = delayed_node->root->fs_info->delayed_root;
|
|
finish_one_item(delayed_root);
|
|
}
|
|
|
|
static int __btrfs_update_delayed_inode(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root,
|
|
struct btrfs_path *path,
|
|
struct btrfs_delayed_node *node)
|
|
{
|
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
|
struct btrfs_key key;
|
|
struct btrfs_inode_item *inode_item;
|
|
struct extent_buffer *leaf;
|
|
int mod;
|
|
int ret;
|
|
|
|
key.objectid = node->inode_id;
|
|
key.type = BTRFS_INODE_ITEM_KEY;
|
|
key.offset = 0;
|
|
|
|
if (test_bit(BTRFS_DELAYED_NODE_DEL_IREF, &node->flags))
|
|
mod = -1;
|
|
else
|
|
mod = 1;
|
|
|
|
ret = btrfs_lookup_inode(trans, root, path, &key, mod);
|
|
if (ret > 0) {
|
|
btrfs_release_path(path);
|
|
return -ENOENT;
|
|
} else if (ret < 0) {
|
|
return ret;
|
|
}
|
|
|
|
leaf = path->nodes[0];
|
|
inode_item = btrfs_item_ptr(leaf, path->slots[0],
|
|
struct btrfs_inode_item);
|
|
write_extent_buffer(leaf, &node->inode_item, (unsigned long)inode_item,
|
|
sizeof(struct btrfs_inode_item));
|
|
btrfs_mark_buffer_dirty(leaf);
|
|
|
|
if (!test_bit(BTRFS_DELAYED_NODE_DEL_IREF, &node->flags))
|
|
goto no_iref;
|
|
|
|
path->slots[0]++;
|
|
if (path->slots[0] >= btrfs_header_nritems(leaf))
|
|
goto search;
|
|
again:
|
|
btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
|
|
if (key.objectid != node->inode_id)
|
|
goto out;
|
|
|
|
if (key.type != BTRFS_INODE_REF_KEY &&
|
|
key.type != BTRFS_INODE_EXTREF_KEY)
|
|
goto out;
|
|
|
|
/*
|
|
* Delayed iref deletion is for the inode who has only one link,
|
|
* so there is only one iref. The case that several irefs are
|
|
* in the same item doesn't exist.
|
|
*/
|
|
btrfs_del_item(trans, root, path);
|
|
out:
|
|
btrfs_release_delayed_iref(node);
|
|
no_iref:
|
|
btrfs_release_path(path);
|
|
err_out:
|
|
btrfs_delayed_inode_release_metadata(fs_info, node, (ret < 0));
|
|
btrfs_release_delayed_inode(node);
|
|
|
|
return ret;
|
|
|
|
search:
|
|
btrfs_release_path(path);
|
|
|
|
key.type = BTRFS_INODE_EXTREF_KEY;
|
|
key.offset = -1;
|
|
ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
|
|
if (ret < 0)
|
|
goto err_out;
|
|
ASSERT(ret);
|
|
|
|
ret = 0;
|
|
leaf = path->nodes[0];
|
|
path->slots[0]--;
|
|
goto again;
|
|
}
|
|
|
|
static inline int btrfs_update_delayed_inode(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root,
|
|
struct btrfs_path *path,
|
|
struct btrfs_delayed_node *node)
|
|
{
|
|
int ret;
|
|
|
|
mutex_lock(&node->mutex);
|
|
if (!test_bit(BTRFS_DELAYED_NODE_INODE_DIRTY, &node->flags)) {
|
|
mutex_unlock(&node->mutex);
|
|
return 0;
|
|
}
|
|
|
|
ret = __btrfs_update_delayed_inode(trans, root, path, node);
|
|
mutex_unlock(&node->mutex);
|
|
return ret;
|
|
}
|
|
|
|
static inline int
|
|
__btrfs_commit_inode_delayed_items(struct btrfs_trans_handle *trans,
|
|
struct btrfs_path *path,
|
|
struct btrfs_delayed_node *node)
|
|
{
|
|
int ret;
|
|
|
|
ret = btrfs_insert_delayed_items(trans, path, node->root, node);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = btrfs_delete_delayed_items(trans, path, node->root, node);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = btrfs_update_delayed_inode(trans, node->root, path, node);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Called when committing the transaction.
|
|
* Returns 0 on success.
|
|
* Returns < 0 on error and returns with an aborted transaction with any
|
|
* outstanding delayed items cleaned up.
|
|
*/
|
|
static int __btrfs_run_delayed_items(struct btrfs_trans_handle *trans, int nr)
|
|
{
|
|
struct btrfs_fs_info *fs_info = trans->fs_info;
|
|
struct btrfs_delayed_root *delayed_root;
|
|
struct btrfs_delayed_node *curr_node, *prev_node;
|
|
struct btrfs_path *path;
|
|
struct btrfs_block_rsv *block_rsv;
|
|
int ret = 0;
|
|
bool count = (nr > 0);
|
|
|
|
if (trans->aborted)
|
|
return -EIO;
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
path->leave_spinning = 1;
|
|
|
|
block_rsv = trans->block_rsv;
|
|
trans->block_rsv = &fs_info->delayed_block_rsv;
|
|
|
|
delayed_root = fs_info->delayed_root;
|
|
|
|
curr_node = btrfs_first_delayed_node(delayed_root);
|
|
while (curr_node && (!count || (count && nr--))) {
|
|
ret = __btrfs_commit_inode_delayed_items(trans, path,
|
|
curr_node);
|
|
if (ret) {
|
|
btrfs_release_delayed_node(curr_node);
|
|
curr_node = NULL;
|
|
btrfs_abort_transaction(trans, ret);
|
|
break;
|
|
}
|
|
|
|
prev_node = curr_node;
|
|
curr_node = btrfs_next_delayed_node(curr_node);
|
|
btrfs_release_delayed_node(prev_node);
|
|
}
|
|
|
|
if (curr_node)
|
|
btrfs_release_delayed_node(curr_node);
|
|
btrfs_free_path(path);
|
|
trans->block_rsv = block_rsv;
|
|
|
|
return ret;
|
|
}
|
|
|
|
int btrfs_run_delayed_items(struct btrfs_trans_handle *trans)
|
|
{
|
|
return __btrfs_run_delayed_items(trans, -1);
|
|
}
|
|
|
|
int btrfs_run_delayed_items_nr(struct btrfs_trans_handle *trans, int nr)
|
|
{
|
|
return __btrfs_run_delayed_items(trans, nr);
|
|
}
|
|
|
|
int btrfs_commit_inode_delayed_items(struct btrfs_trans_handle *trans,
|
|
struct btrfs_inode *inode)
|
|
{
|
|
struct btrfs_delayed_node *delayed_node = btrfs_get_delayed_node(inode);
|
|
struct btrfs_path *path;
|
|
struct btrfs_block_rsv *block_rsv;
|
|
int ret;
|
|
|
|
if (!delayed_node)
|
|
return 0;
|
|
|
|
mutex_lock(&delayed_node->mutex);
|
|
if (!delayed_node->count) {
|
|
mutex_unlock(&delayed_node->mutex);
|
|
btrfs_release_delayed_node(delayed_node);
|
|
return 0;
|
|
}
|
|
mutex_unlock(&delayed_node->mutex);
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path) {
|
|
btrfs_release_delayed_node(delayed_node);
|
|
return -ENOMEM;
|
|
}
|
|
path->leave_spinning = 1;
|
|
|
|
block_rsv = trans->block_rsv;
|
|
trans->block_rsv = &delayed_node->root->fs_info->delayed_block_rsv;
|
|
|
|
ret = __btrfs_commit_inode_delayed_items(trans, path, delayed_node);
|
|
|
|
btrfs_release_delayed_node(delayed_node);
|
|
btrfs_free_path(path);
|
|
trans->block_rsv = block_rsv;
|
|
|
|
return ret;
|
|
}
|
|
|
|
int btrfs_commit_inode_delayed_inode(struct btrfs_inode *inode)
|
|
{
|
|
struct btrfs_fs_info *fs_info = btrfs_sb(inode->vfs_inode.i_sb);
|
|
struct btrfs_trans_handle *trans;
|
|
struct btrfs_delayed_node *delayed_node = btrfs_get_delayed_node(inode);
|
|
struct btrfs_path *path;
|
|
struct btrfs_block_rsv *block_rsv;
|
|
int ret;
|
|
|
|
if (!delayed_node)
|
|
return 0;
|
|
|
|
mutex_lock(&delayed_node->mutex);
|
|
if (!test_bit(BTRFS_DELAYED_NODE_INODE_DIRTY, &delayed_node->flags)) {
|
|
mutex_unlock(&delayed_node->mutex);
|
|
btrfs_release_delayed_node(delayed_node);
|
|
return 0;
|
|
}
|
|
mutex_unlock(&delayed_node->mutex);
|
|
|
|
trans = btrfs_join_transaction(delayed_node->root);
|
|
if (IS_ERR(trans)) {
|
|
ret = PTR_ERR(trans);
|
|
goto out;
|
|
}
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path) {
|
|
ret = -ENOMEM;
|
|
goto trans_out;
|
|
}
|
|
path->leave_spinning = 1;
|
|
|
|
block_rsv = trans->block_rsv;
|
|
trans->block_rsv = &fs_info->delayed_block_rsv;
|
|
|
|
mutex_lock(&delayed_node->mutex);
|
|
if (test_bit(BTRFS_DELAYED_NODE_INODE_DIRTY, &delayed_node->flags))
|
|
ret = __btrfs_update_delayed_inode(trans, delayed_node->root,
|
|
path, delayed_node);
|
|
else
|
|
ret = 0;
|
|
mutex_unlock(&delayed_node->mutex);
|
|
|
|
btrfs_free_path(path);
|
|
trans->block_rsv = block_rsv;
|
|
trans_out:
|
|
btrfs_end_transaction(trans);
|
|
btrfs_btree_balance_dirty(fs_info);
|
|
out:
|
|
btrfs_release_delayed_node(delayed_node);
|
|
|
|
return ret;
|
|
}
|
|
|
|
void btrfs_remove_delayed_node(struct btrfs_inode *inode)
|
|
{
|
|
struct btrfs_delayed_node *delayed_node;
|
|
|
|
delayed_node = READ_ONCE(inode->delayed_node);
|
|
if (!delayed_node)
|
|
return;
|
|
|
|
inode->delayed_node = NULL;
|
|
btrfs_release_delayed_node(delayed_node);
|
|
}
|
|
|
|
struct btrfs_async_delayed_work {
|
|
struct btrfs_delayed_root *delayed_root;
|
|
int nr;
|
|
struct btrfs_work work;
|
|
};
|
|
|
|
static void btrfs_async_run_delayed_root(struct btrfs_work *work)
|
|
{
|
|
struct btrfs_async_delayed_work *async_work;
|
|
struct btrfs_delayed_root *delayed_root;
|
|
struct btrfs_trans_handle *trans;
|
|
struct btrfs_path *path;
|
|
struct btrfs_delayed_node *delayed_node = NULL;
|
|
struct btrfs_root *root;
|
|
struct btrfs_block_rsv *block_rsv;
|
|
int total_done = 0;
|
|
|
|
async_work = container_of(work, struct btrfs_async_delayed_work, work);
|
|
delayed_root = async_work->delayed_root;
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
goto out;
|
|
|
|
do {
|
|
if (atomic_read(&delayed_root->items) <
|
|
BTRFS_DELAYED_BACKGROUND / 2)
|
|
break;
|
|
|
|
delayed_node = btrfs_first_prepared_delayed_node(delayed_root);
|
|
if (!delayed_node)
|
|
break;
|
|
|
|
path->leave_spinning = 1;
|
|
root = delayed_node->root;
|
|
|
|
trans = btrfs_join_transaction(root);
|
|
if (IS_ERR(trans)) {
|
|
btrfs_release_path(path);
|
|
btrfs_release_prepared_delayed_node(delayed_node);
|
|
total_done++;
|
|
continue;
|
|
}
|
|
|
|
block_rsv = trans->block_rsv;
|
|
trans->block_rsv = &root->fs_info->delayed_block_rsv;
|
|
|
|
__btrfs_commit_inode_delayed_items(trans, path, delayed_node);
|
|
|
|
trans->block_rsv = block_rsv;
|
|
btrfs_end_transaction(trans);
|
|
btrfs_btree_balance_dirty_nodelay(root->fs_info);
|
|
|
|
btrfs_release_path(path);
|
|
btrfs_release_prepared_delayed_node(delayed_node);
|
|
total_done++;
|
|
|
|
} while ((async_work->nr == 0 && total_done < BTRFS_DELAYED_WRITEBACK)
|
|
|| total_done < async_work->nr);
|
|
|
|
btrfs_free_path(path);
|
|
out:
|
|
wake_up(&delayed_root->wait);
|
|
kfree(async_work);
|
|
}
|
|
|
|
|
|
static int btrfs_wq_run_delayed_node(struct btrfs_delayed_root *delayed_root,
|
|
struct btrfs_fs_info *fs_info, int nr)
|
|
{
|
|
struct btrfs_async_delayed_work *async_work;
|
|
|
|
async_work = kmalloc(sizeof(*async_work), GFP_NOFS);
|
|
if (!async_work)
|
|
return -ENOMEM;
|
|
|
|
async_work->delayed_root = delayed_root;
|
|
btrfs_init_work(&async_work->work, btrfs_delayed_meta_helper,
|
|
btrfs_async_run_delayed_root, NULL, NULL);
|
|
async_work->nr = nr;
|
|
|
|
btrfs_queue_work(fs_info->delayed_workers, &async_work->work);
|
|
return 0;
|
|
}
|
|
|
|
void btrfs_assert_delayed_root_empty(struct btrfs_fs_info *fs_info)
|
|
{
|
|
WARN_ON(btrfs_first_delayed_node(fs_info->delayed_root));
|
|
}
|
|
|
|
static int could_end_wait(struct btrfs_delayed_root *delayed_root, int seq)
|
|
{
|
|
int val = atomic_read(&delayed_root->items_seq);
|
|
|
|
if (val < seq || val >= seq + BTRFS_DELAYED_BATCH)
|
|
return 1;
|
|
|
|
if (atomic_read(&delayed_root->items) < BTRFS_DELAYED_BACKGROUND)
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
void btrfs_balance_delayed_items(struct btrfs_fs_info *fs_info)
|
|
{
|
|
struct btrfs_delayed_root *delayed_root = fs_info->delayed_root;
|
|
|
|
if ((atomic_read(&delayed_root->items) < BTRFS_DELAYED_BACKGROUND) ||
|
|
btrfs_workqueue_normal_congested(fs_info->delayed_workers))
|
|
return;
|
|
|
|
if (atomic_read(&delayed_root->items) >= BTRFS_DELAYED_WRITEBACK) {
|
|
int seq;
|
|
int ret;
|
|
|
|
seq = atomic_read(&delayed_root->items_seq);
|
|
|
|
ret = btrfs_wq_run_delayed_node(delayed_root, fs_info, 0);
|
|
if (ret)
|
|
return;
|
|
|
|
wait_event_interruptible(delayed_root->wait,
|
|
could_end_wait(delayed_root, seq));
|
|
return;
|
|
}
|
|
|
|
btrfs_wq_run_delayed_node(delayed_root, fs_info, BTRFS_DELAYED_BATCH);
|
|
}
|
|
|
|
/* Will return 0 or -ENOMEM */
|
|
int btrfs_insert_delayed_dir_index(struct btrfs_trans_handle *trans,
|
|
struct btrfs_fs_info *fs_info,
|
|
const char *name, int name_len,
|
|
struct btrfs_inode *dir,
|
|
struct btrfs_disk_key *disk_key, u8 type,
|
|
u64 index)
|
|
{
|
|
struct btrfs_delayed_node *delayed_node;
|
|
struct btrfs_delayed_item *delayed_item;
|
|
struct btrfs_dir_item *dir_item;
|
|
int ret;
|
|
|
|
delayed_node = btrfs_get_or_create_delayed_node(dir);
|
|
if (IS_ERR(delayed_node))
|
|
return PTR_ERR(delayed_node);
|
|
|
|
delayed_item = btrfs_alloc_delayed_item(sizeof(*dir_item) + name_len);
|
|
if (!delayed_item) {
|
|
ret = -ENOMEM;
|
|
goto release_node;
|
|
}
|
|
|
|
delayed_item->key.objectid = btrfs_ino(dir);
|
|
delayed_item->key.type = BTRFS_DIR_INDEX_KEY;
|
|
delayed_item->key.offset = index;
|
|
|
|
dir_item = (struct btrfs_dir_item *)delayed_item->data;
|
|
dir_item->location = *disk_key;
|
|
btrfs_set_stack_dir_transid(dir_item, trans->transid);
|
|
btrfs_set_stack_dir_data_len(dir_item, 0);
|
|
btrfs_set_stack_dir_name_len(dir_item, name_len);
|
|
btrfs_set_stack_dir_type(dir_item, type);
|
|
memcpy((char *)(dir_item + 1), name, name_len);
|
|
|
|
ret = btrfs_delayed_item_reserve_metadata(trans, dir->root, delayed_item);
|
|
/*
|
|
* we have reserved enough space when we start a new transaction,
|
|
* so reserving metadata failure is impossible
|
|
*/
|
|
BUG_ON(ret);
|
|
|
|
|
|
mutex_lock(&delayed_node->mutex);
|
|
ret = __btrfs_add_delayed_insertion_item(delayed_node, delayed_item);
|
|
if (unlikely(ret)) {
|
|
btrfs_err(fs_info,
|
|
"err add delayed dir index item(name: %.*s) into the insertion tree of the delayed node(root id: %llu, inode id: %llu, errno: %d)",
|
|
name_len, name, delayed_node->root->objectid,
|
|
delayed_node->inode_id, ret);
|
|
BUG();
|
|
}
|
|
mutex_unlock(&delayed_node->mutex);
|
|
|
|
release_node:
|
|
btrfs_release_delayed_node(delayed_node);
|
|
return ret;
|
|
}
|
|
|
|
static int btrfs_delete_delayed_insertion_item(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_delayed_node *node,
|
|
struct btrfs_key *key)
|
|
{
|
|
struct btrfs_delayed_item *item;
|
|
|
|
mutex_lock(&node->mutex);
|
|
item = __btrfs_lookup_delayed_insertion_item(node, key);
|
|
if (!item) {
|
|
mutex_unlock(&node->mutex);
|
|
return 1;
|
|
}
|
|
|
|
btrfs_delayed_item_release_metadata(node->root, item);
|
|
btrfs_release_delayed_item(item);
|
|
mutex_unlock(&node->mutex);
|
|
return 0;
|
|
}
|
|
|
|
int btrfs_delete_delayed_dir_index(struct btrfs_trans_handle *trans,
|
|
struct btrfs_fs_info *fs_info,
|
|
struct btrfs_inode *dir, u64 index)
|
|
{
|
|
struct btrfs_delayed_node *node;
|
|
struct btrfs_delayed_item *item;
|
|
struct btrfs_key item_key;
|
|
int ret;
|
|
|
|
node = btrfs_get_or_create_delayed_node(dir);
|
|
if (IS_ERR(node))
|
|
return PTR_ERR(node);
|
|
|
|
item_key.objectid = btrfs_ino(dir);
|
|
item_key.type = BTRFS_DIR_INDEX_KEY;
|
|
item_key.offset = index;
|
|
|
|
ret = btrfs_delete_delayed_insertion_item(fs_info, node, &item_key);
|
|
if (!ret)
|
|
goto end;
|
|
|
|
item = btrfs_alloc_delayed_item(0);
|
|
if (!item) {
|
|
ret = -ENOMEM;
|
|
goto end;
|
|
}
|
|
|
|
item->key = item_key;
|
|
|
|
ret = btrfs_delayed_item_reserve_metadata(trans, dir->root, item);
|
|
/*
|
|
* we have reserved enough space when we start a new transaction,
|
|
* so reserving metadata failure is impossible.
|
|
*/
|
|
BUG_ON(ret);
|
|
|
|
mutex_lock(&node->mutex);
|
|
ret = __btrfs_add_delayed_deletion_item(node, item);
|
|
if (unlikely(ret)) {
|
|
btrfs_err(fs_info,
|
|
"err add delayed dir index item(index: %llu) into the deletion tree of the delayed node(root id: %llu, inode id: %llu, errno: %d)",
|
|
index, node->root->objectid, node->inode_id, ret);
|
|
BUG();
|
|
}
|
|
mutex_unlock(&node->mutex);
|
|
end:
|
|
btrfs_release_delayed_node(node);
|
|
return ret;
|
|
}
|
|
|
|
int btrfs_inode_delayed_dir_index_count(struct btrfs_inode *inode)
|
|
{
|
|
struct btrfs_delayed_node *delayed_node = btrfs_get_delayed_node(inode);
|
|
|
|
if (!delayed_node)
|
|
return -ENOENT;
|
|
|
|
/*
|
|
* Since we have held i_mutex of this directory, it is impossible that
|
|
* a new directory index is added into the delayed node and index_cnt
|
|
* is updated now. So we needn't lock the delayed node.
|
|
*/
|
|
if (!delayed_node->index_cnt) {
|
|
btrfs_release_delayed_node(delayed_node);
|
|
return -EINVAL;
|
|
}
|
|
|
|
inode->index_cnt = delayed_node->index_cnt;
|
|
btrfs_release_delayed_node(delayed_node);
|
|
return 0;
|
|
}
|
|
|
|
bool btrfs_readdir_get_delayed_items(struct inode *inode,
|
|
struct list_head *ins_list,
|
|
struct list_head *del_list)
|
|
{
|
|
struct btrfs_delayed_node *delayed_node;
|
|
struct btrfs_delayed_item *item;
|
|
|
|
delayed_node = btrfs_get_delayed_node(BTRFS_I(inode));
|
|
if (!delayed_node)
|
|
return false;
|
|
|
|
/*
|
|
* We can only do one readdir with delayed items at a time because of
|
|
* item->readdir_list.
|
|
*/
|
|
inode_unlock_shared(inode);
|
|
inode_lock(inode);
|
|
|
|
mutex_lock(&delayed_node->mutex);
|
|
item = __btrfs_first_delayed_insertion_item(delayed_node);
|
|
while (item) {
|
|
refcount_inc(&item->refs);
|
|
list_add_tail(&item->readdir_list, ins_list);
|
|
item = __btrfs_next_delayed_item(item);
|
|
}
|
|
|
|
item = __btrfs_first_delayed_deletion_item(delayed_node);
|
|
while (item) {
|
|
refcount_inc(&item->refs);
|
|
list_add_tail(&item->readdir_list, del_list);
|
|
item = __btrfs_next_delayed_item(item);
|
|
}
|
|
mutex_unlock(&delayed_node->mutex);
|
|
/*
|
|
* This delayed node is still cached in the btrfs inode, so refs
|
|
* must be > 1 now, and we needn't check it is going to be freed
|
|
* or not.
|
|
*
|
|
* Besides that, this function is used to read dir, we do not
|
|
* insert/delete delayed items in this period. So we also needn't
|
|
* requeue or dequeue this delayed node.
|
|
*/
|
|
refcount_dec(&delayed_node->refs);
|
|
|
|
return true;
|
|
}
|
|
|
|
void btrfs_readdir_put_delayed_items(struct inode *inode,
|
|
struct list_head *ins_list,
|
|
struct list_head *del_list)
|
|
{
|
|
struct btrfs_delayed_item *curr, *next;
|
|
|
|
list_for_each_entry_safe(curr, next, ins_list, readdir_list) {
|
|
list_del(&curr->readdir_list);
|
|
if (refcount_dec_and_test(&curr->refs))
|
|
kfree(curr);
|
|
}
|
|
|
|
list_for_each_entry_safe(curr, next, del_list, readdir_list) {
|
|
list_del(&curr->readdir_list);
|
|
if (refcount_dec_and_test(&curr->refs))
|
|
kfree(curr);
|
|
}
|
|
|
|
/*
|
|
* The VFS is going to do up_read(), so we need to downgrade back to a
|
|
* read lock.
|
|
*/
|
|
downgrade_write(&inode->i_rwsem);
|
|
}
|
|
|
|
int btrfs_should_delete_dir_index(struct list_head *del_list,
|
|
u64 index)
|
|
{
|
|
struct btrfs_delayed_item *curr;
|
|
int ret = 0;
|
|
|
|
list_for_each_entry(curr, del_list, readdir_list) {
|
|
if (curr->key.offset > index)
|
|
break;
|
|
if (curr->key.offset == index) {
|
|
ret = 1;
|
|
break;
|
|
}
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* btrfs_readdir_delayed_dir_index - read dir info stored in the delayed tree
|
|
*
|
|
*/
|
|
int btrfs_readdir_delayed_dir_index(struct dir_context *ctx,
|
|
struct list_head *ins_list)
|
|
{
|
|
struct btrfs_dir_item *di;
|
|
struct btrfs_delayed_item *curr, *next;
|
|
struct btrfs_key location;
|
|
char *name;
|
|
int name_len;
|
|
int over = 0;
|
|
unsigned char d_type;
|
|
|
|
if (list_empty(ins_list))
|
|
return 0;
|
|
|
|
/*
|
|
* Changing the data of the delayed item is impossible. So
|
|
* we needn't lock them. And we have held i_mutex of the
|
|
* directory, nobody can delete any directory indexes now.
|
|
*/
|
|
list_for_each_entry_safe(curr, next, ins_list, readdir_list) {
|
|
list_del(&curr->readdir_list);
|
|
|
|
if (curr->key.offset < ctx->pos) {
|
|
if (refcount_dec_and_test(&curr->refs))
|
|
kfree(curr);
|
|
continue;
|
|
}
|
|
|
|
ctx->pos = curr->key.offset;
|
|
|
|
di = (struct btrfs_dir_item *)curr->data;
|
|
name = (char *)(di + 1);
|
|
name_len = btrfs_stack_dir_name_len(di);
|
|
|
|
d_type = btrfs_filetype_table[di->type];
|
|
btrfs_disk_key_to_cpu(&location, &di->location);
|
|
|
|
over = !dir_emit(ctx, name, name_len,
|
|
location.objectid, d_type);
|
|
|
|
if (refcount_dec_and_test(&curr->refs))
|
|
kfree(curr);
|
|
|
|
if (over)
|
|
return 1;
|
|
ctx->pos++;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void fill_stack_inode_item(struct btrfs_trans_handle *trans,
|
|
struct btrfs_inode_item *inode_item,
|
|
struct inode *inode)
|
|
{
|
|
btrfs_set_stack_inode_uid(inode_item, i_uid_read(inode));
|
|
btrfs_set_stack_inode_gid(inode_item, i_gid_read(inode));
|
|
btrfs_set_stack_inode_size(inode_item, BTRFS_I(inode)->disk_i_size);
|
|
btrfs_set_stack_inode_mode(inode_item, inode->i_mode);
|
|
btrfs_set_stack_inode_nlink(inode_item, inode->i_nlink);
|
|
btrfs_set_stack_inode_nbytes(inode_item, inode_get_bytes(inode));
|
|
btrfs_set_stack_inode_generation(inode_item,
|
|
BTRFS_I(inode)->generation);
|
|
btrfs_set_stack_inode_sequence(inode_item,
|
|
inode_peek_iversion(inode));
|
|
btrfs_set_stack_inode_transid(inode_item, trans->transid);
|
|
btrfs_set_stack_inode_rdev(inode_item, inode->i_rdev);
|
|
btrfs_set_stack_inode_flags(inode_item, BTRFS_I(inode)->flags);
|
|
btrfs_set_stack_inode_block_group(inode_item, 0);
|
|
|
|
btrfs_set_stack_timespec_sec(&inode_item->atime,
|
|
inode->i_atime.tv_sec);
|
|
btrfs_set_stack_timespec_nsec(&inode_item->atime,
|
|
inode->i_atime.tv_nsec);
|
|
|
|
btrfs_set_stack_timespec_sec(&inode_item->mtime,
|
|
inode->i_mtime.tv_sec);
|
|
btrfs_set_stack_timespec_nsec(&inode_item->mtime,
|
|
inode->i_mtime.tv_nsec);
|
|
|
|
btrfs_set_stack_timespec_sec(&inode_item->ctime,
|
|
inode->i_ctime.tv_sec);
|
|
btrfs_set_stack_timespec_nsec(&inode_item->ctime,
|
|
inode->i_ctime.tv_nsec);
|
|
|
|
btrfs_set_stack_timespec_sec(&inode_item->otime,
|
|
BTRFS_I(inode)->i_otime.tv_sec);
|
|
btrfs_set_stack_timespec_nsec(&inode_item->otime,
|
|
BTRFS_I(inode)->i_otime.tv_nsec);
|
|
}
|
|
|
|
int btrfs_fill_inode(struct inode *inode, u32 *rdev)
|
|
{
|
|
struct btrfs_delayed_node *delayed_node;
|
|
struct btrfs_inode_item *inode_item;
|
|
|
|
delayed_node = btrfs_get_delayed_node(BTRFS_I(inode));
|
|
if (!delayed_node)
|
|
return -ENOENT;
|
|
|
|
mutex_lock(&delayed_node->mutex);
|
|
if (!test_bit(BTRFS_DELAYED_NODE_INODE_DIRTY, &delayed_node->flags)) {
|
|
mutex_unlock(&delayed_node->mutex);
|
|
btrfs_release_delayed_node(delayed_node);
|
|
return -ENOENT;
|
|
}
|
|
|
|
inode_item = &delayed_node->inode_item;
|
|
|
|
i_uid_write(inode, btrfs_stack_inode_uid(inode_item));
|
|
i_gid_write(inode, btrfs_stack_inode_gid(inode_item));
|
|
btrfs_i_size_write(BTRFS_I(inode), btrfs_stack_inode_size(inode_item));
|
|
inode->i_mode = btrfs_stack_inode_mode(inode_item);
|
|
set_nlink(inode, btrfs_stack_inode_nlink(inode_item));
|
|
inode_set_bytes(inode, btrfs_stack_inode_nbytes(inode_item));
|
|
BTRFS_I(inode)->generation = btrfs_stack_inode_generation(inode_item);
|
|
BTRFS_I(inode)->last_trans = btrfs_stack_inode_transid(inode_item);
|
|
|
|
inode_set_iversion_queried(inode,
|
|
btrfs_stack_inode_sequence(inode_item));
|
|
inode->i_rdev = 0;
|
|
*rdev = btrfs_stack_inode_rdev(inode_item);
|
|
BTRFS_I(inode)->flags = btrfs_stack_inode_flags(inode_item);
|
|
|
|
inode->i_atime.tv_sec = btrfs_stack_timespec_sec(&inode_item->atime);
|
|
inode->i_atime.tv_nsec = btrfs_stack_timespec_nsec(&inode_item->atime);
|
|
|
|
inode->i_mtime.tv_sec = btrfs_stack_timespec_sec(&inode_item->mtime);
|
|
inode->i_mtime.tv_nsec = btrfs_stack_timespec_nsec(&inode_item->mtime);
|
|
|
|
inode->i_ctime.tv_sec = btrfs_stack_timespec_sec(&inode_item->ctime);
|
|
inode->i_ctime.tv_nsec = btrfs_stack_timespec_nsec(&inode_item->ctime);
|
|
|
|
BTRFS_I(inode)->i_otime.tv_sec =
|
|
btrfs_stack_timespec_sec(&inode_item->otime);
|
|
BTRFS_I(inode)->i_otime.tv_nsec =
|
|
btrfs_stack_timespec_nsec(&inode_item->otime);
|
|
|
|
inode->i_generation = BTRFS_I(inode)->generation;
|
|
BTRFS_I(inode)->index_cnt = (u64)-1;
|
|
|
|
mutex_unlock(&delayed_node->mutex);
|
|
btrfs_release_delayed_node(delayed_node);
|
|
return 0;
|
|
}
|
|
|
|
int btrfs_delayed_update_inode(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root, struct inode *inode)
|
|
{
|
|
struct btrfs_delayed_node *delayed_node;
|
|
int ret = 0;
|
|
|
|
delayed_node = btrfs_get_or_create_delayed_node(BTRFS_I(inode));
|
|
if (IS_ERR(delayed_node))
|
|
return PTR_ERR(delayed_node);
|
|
|
|
mutex_lock(&delayed_node->mutex);
|
|
if (test_bit(BTRFS_DELAYED_NODE_INODE_DIRTY, &delayed_node->flags)) {
|
|
fill_stack_inode_item(trans, &delayed_node->inode_item, inode);
|
|
goto release_node;
|
|
}
|
|
|
|
ret = btrfs_delayed_inode_reserve_metadata(trans, root, BTRFS_I(inode),
|
|
delayed_node);
|
|
if (ret)
|
|
goto release_node;
|
|
|
|
fill_stack_inode_item(trans, &delayed_node->inode_item, inode);
|
|
set_bit(BTRFS_DELAYED_NODE_INODE_DIRTY, &delayed_node->flags);
|
|
delayed_node->count++;
|
|
atomic_inc(&root->fs_info->delayed_root->items);
|
|
release_node:
|
|
mutex_unlock(&delayed_node->mutex);
|
|
btrfs_release_delayed_node(delayed_node);
|
|
return ret;
|
|
}
|
|
|
|
int btrfs_delayed_delete_inode_ref(struct btrfs_inode *inode)
|
|
{
|
|
struct btrfs_fs_info *fs_info = btrfs_sb(inode->vfs_inode.i_sb);
|
|
struct btrfs_delayed_node *delayed_node;
|
|
|
|
/*
|
|
* we don't do delayed inode updates during log recovery because it
|
|
* leads to enospc problems. This means we also can't do
|
|
* delayed inode refs
|
|
*/
|
|
if (test_bit(BTRFS_FS_LOG_RECOVERING, &fs_info->flags))
|
|
return -EAGAIN;
|
|
|
|
delayed_node = btrfs_get_or_create_delayed_node(inode);
|
|
if (IS_ERR(delayed_node))
|
|
return PTR_ERR(delayed_node);
|
|
|
|
/*
|
|
* We don't reserve space for inode ref deletion is because:
|
|
* - We ONLY do async inode ref deletion for the inode who has only
|
|
* one link(i_nlink == 1), it means there is only one inode ref.
|
|
* And in most case, the inode ref and the inode item are in the
|
|
* same leaf, and we will deal with them at the same time.
|
|
* Since we are sure we will reserve the space for the inode item,
|
|
* it is unnecessary to reserve space for inode ref deletion.
|
|
* - If the inode ref and the inode item are not in the same leaf,
|
|
* We also needn't worry about enospc problem, because we reserve
|
|
* much more space for the inode update than it needs.
|
|
* - At the worst, we can steal some space from the global reservation.
|
|
* It is very rare.
|
|
*/
|
|
mutex_lock(&delayed_node->mutex);
|
|
if (test_bit(BTRFS_DELAYED_NODE_DEL_IREF, &delayed_node->flags))
|
|
goto release_node;
|
|
|
|
set_bit(BTRFS_DELAYED_NODE_DEL_IREF, &delayed_node->flags);
|
|
delayed_node->count++;
|
|
atomic_inc(&fs_info->delayed_root->items);
|
|
release_node:
|
|
mutex_unlock(&delayed_node->mutex);
|
|
btrfs_release_delayed_node(delayed_node);
|
|
return 0;
|
|
}
|
|
|
|
static void __btrfs_kill_delayed_node(struct btrfs_delayed_node *delayed_node)
|
|
{
|
|
struct btrfs_root *root = delayed_node->root;
|
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
|
struct btrfs_delayed_item *curr_item, *prev_item;
|
|
|
|
mutex_lock(&delayed_node->mutex);
|
|
curr_item = __btrfs_first_delayed_insertion_item(delayed_node);
|
|
while (curr_item) {
|
|
btrfs_delayed_item_release_metadata(root, curr_item);
|
|
prev_item = curr_item;
|
|
curr_item = __btrfs_next_delayed_item(prev_item);
|
|
btrfs_release_delayed_item(prev_item);
|
|
}
|
|
|
|
curr_item = __btrfs_first_delayed_deletion_item(delayed_node);
|
|
while (curr_item) {
|
|
btrfs_delayed_item_release_metadata(root, curr_item);
|
|
prev_item = curr_item;
|
|
curr_item = __btrfs_next_delayed_item(prev_item);
|
|
btrfs_release_delayed_item(prev_item);
|
|
}
|
|
|
|
if (test_bit(BTRFS_DELAYED_NODE_DEL_IREF, &delayed_node->flags))
|
|
btrfs_release_delayed_iref(delayed_node);
|
|
|
|
if (test_bit(BTRFS_DELAYED_NODE_INODE_DIRTY, &delayed_node->flags)) {
|
|
btrfs_delayed_inode_release_metadata(fs_info, delayed_node, false);
|
|
btrfs_release_delayed_inode(delayed_node);
|
|
}
|
|
mutex_unlock(&delayed_node->mutex);
|
|
}
|
|
|
|
void btrfs_kill_delayed_inode_items(struct btrfs_inode *inode)
|
|
{
|
|
struct btrfs_delayed_node *delayed_node;
|
|
|
|
delayed_node = btrfs_get_delayed_node(inode);
|
|
if (!delayed_node)
|
|
return;
|
|
|
|
__btrfs_kill_delayed_node(delayed_node);
|
|
btrfs_release_delayed_node(delayed_node);
|
|
}
|
|
|
|
void btrfs_kill_all_delayed_nodes(struct btrfs_root *root)
|
|
{
|
|
u64 inode_id = 0;
|
|
struct btrfs_delayed_node *delayed_nodes[8];
|
|
int i, n;
|
|
|
|
while (1) {
|
|
spin_lock(&root->inode_lock);
|
|
n = radix_tree_gang_lookup(&root->delayed_nodes_tree,
|
|
(void **)delayed_nodes, inode_id,
|
|
ARRAY_SIZE(delayed_nodes));
|
|
if (!n) {
|
|
spin_unlock(&root->inode_lock);
|
|
break;
|
|
}
|
|
|
|
inode_id = delayed_nodes[n - 1]->inode_id + 1;
|
|
|
|
for (i = 0; i < n; i++)
|
|
refcount_inc(&delayed_nodes[i]->refs);
|
|
spin_unlock(&root->inode_lock);
|
|
|
|
for (i = 0; i < n; i++) {
|
|
__btrfs_kill_delayed_node(delayed_nodes[i]);
|
|
btrfs_release_delayed_node(delayed_nodes[i]);
|
|
}
|
|
}
|
|
}
|
|
|
|
void btrfs_destroy_delayed_inodes(struct btrfs_fs_info *fs_info)
|
|
{
|
|
struct btrfs_delayed_node *curr_node, *prev_node;
|
|
|
|
curr_node = btrfs_first_delayed_node(fs_info->delayed_root);
|
|
while (curr_node) {
|
|
__btrfs_kill_delayed_node(curr_node);
|
|
|
|
prev_node = curr_node;
|
|
curr_node = btrfs_next_delayed_node(curr_node);
|
|
btrfs_release_delayed_node(prev_node);
|
|
}
|
|
}
|
|
|