delayed-inode.c

	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 && delayed_node->inode_dirty) {
		BUG_ON(!delayed_node->root);
		delayed_node->inode_dirty = 0;
		delayed_node->count--;

		delayed_root = delayed_node->root->fs_info->delayed_root;
		if (atomic_dec_return(&delayed_root->items) <
		    BTRFS_DELAYED_BACKGROUND &&
		    waitqueue_active(&delayed_root->wait))
			wake_up(&delayed_root->wait);
	}
}

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_key key;
	struct btrfs_inode_item *inode_item;
	struct extent_buffer *leaf;
	int ret;

	key.objectid = node->inode_id;
	btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY);
	key.offset = 0;

	ret = btrfs_lookup_inode(trans, root, path, &key, 1);
	if (ret > 0) {
		btrfs_release_path(path);
		return -ENOENT;
	} else if (ret < 0) {
		return ret;
	}

	btrfs_unlock_up_safe(path, 1);
	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);
	btrfs_release_path(path);

	btrfs_delayed_inode_release_metadata(root, node);
	btrfs_release_delayed_inode(node);

	return 0;
}

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 (!node->inode_dirty) {
		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,
				     struct btrfs_root *root, int nr)
{
	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 = &root->fs_info->delayed_block_rsv;

	delayed_root = btrfs_get_delayed_root(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, root, 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,
			    struct btrfs_root *root)
{
	return __btrfs_run_delayed_items(trans, root, -1);
}

int btrfs_run_delayed_items_nr(struct btrfs_trans_handle *trans,
			       struct btrfs_root *root, int nr)
{
	return __btrfs_run_delayed_items(trans, root, nr);
}

int btrfs_commit_inode_delayed_items(struct btrfs_trans_handle *trans,
				     struct 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)
		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 inode *inode)
{
	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 (!delayed_node->inode_dirty) {
		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 = &delayed_node->root->fs_info->delayed_block_rsv;

	mutex_lock(&delayed_node->mutex);
	if (delayed_node->inode_dirty)
		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, delayed_node->root);
	btrfs_btree_balance_dirty(delayed_node->root);
out:
	btrfs_release_delayed_node(delayed_node);

	return ret;
}

void btrfs_remove_delayed_node(struct inode *inode)
{
	struct btrfs_delayed_node *delayed_node;

	delayed_node = ACCESS_ONCE(BTRFS_I(inode)->delayed_node);
	if (!delayed_node)
		return;

	BTRFS_I(inode)->delayed_node = NULL;
	btrfs_release_delayed_node(delayed_node);
}

struct btrfs_async_delayed_node {
	struct btrfs_root *root;
	struct btrfs_delayed_node *delayed_node;
	struct btrfs_work work;
};

static void btrfs_async_run_delayed_node_done(struct btrfs_work *work)
{
	struct btrfs_async_delayed_node *async_node;
	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 need_requeue = 0;

	async_node = container_of(work, struct btrfs_async_delayed_node, work);

	path = btrfs_alloc_path();
	if (!path)
		goto out;
	path->leave_spinning = 1;

	delayed_node = async_node->delayed_node;
	root = delayed_node->root;

	trans = btrfs_join_transaction(root);
	if (IS_ERR(trans))
		goto free_path;

	block_rsv = trans->block_rsv;
	trans->block_rsv = &root->fs_info->delayed_block_rsv;

	__btrfs_commit_inode_delayed_items(trans, path, delayed_node);
	/*
	 * Maybe new delayed items have been inserted, so we need requeue
	 * the work. Besides that, we must dequeue the empty delayed nodes
	 * to avoid the race between delayed items balance and the worker.
	 * The race like this:
	 * 	Task1				Worker thread
	 * 					count == 0, needn't requeue
	 * 					  also needn't insert the
	 * 					  delayed node into prepare
	 * 					  list again.
	 * 	add lots of delayed items
	 * 	queue the delayed node
	 * 	  already in the list,
	 * 	  and not in the prepare
	 * 	  list, it means the delayed
	 * 	  node is being dealt with
	 * 	  by the worker.
	 * 	do delayed items balance
	 * 	  the delayed node is being
	 * 	  dealt with by the worker
	 * 	  now, just wait.
	 * 	  				the worker goto idle.
	 * Task1 will sleep until the transaction is commited.
	 */
	mutex_lock(&delayed_node->mutex);
	if (delayed_node->count)
		need_requeue = 1;
	else
		btrfs_dequeue_delayed_node(root->fs_info->delayed_root,
					   delayed_node);
	mutex_unlock(&delayed_node->mutex);

	trans->block_rsv = block_rsv;
	btrfs_end_transaction_dmeta(trans, root);
	btrfs_btree_balance_dirty_nodelay(root);
free_path:
	btrfs_free_path(path);
out:
	if (need_requeue)
		btrfs_requeue_work(&async_node->work);
	else {
		btrfs_release_prepared_delayed_node(delayed_node);
		kfree(async_node);
	}
}

static int btrfs_wq_run_delayed_node(struct btrfs_delayed_root *delayed_root,
				     struct btrfs_root *root, int all)
{
	struct btrfs_async_delayed_node *async_node;
	struct btrfs_delayed_node *curr;
	int count = 0;

again:
	curr = btrfs_first_prepared_delayed_node(delayed_root);
	if (!curr)
		return 0;

	async_node = kmalloc(sizeof(*async_node), GFP_NOFS);
	if (!async_node) {
		btrfs_release_prepared_delayed_node(curr);
		return -ENOMEM;
	}

	async_node->root = root;
	async_node->delayed_node = curr;

	async_node->work.func = btrfs_async_run_delayed_node_done;
	async_node->work.flags = 0;

	btrfs_queue_worker(&root->fs_info->delayed_workers, &async_node->work);
	count++;

	if (all || count < 4)
		goto again;

	return 0;
}

void btrfs_assert_delayed_root_empty(struct btrfs_root *root)
{
	struct btrfs_delayed_root *delayed_root;
	delayed_root = btrfs_get_delayed_root(root);
	WARN_ON(btrfs_first_delayed_node(delayed_root));
}

void btrfs_balance_delayed_items(struct btrfs_root *root)
{
	struct btrfs_delayed_root *delayed_root;

	delayed_root = btrfs_get_delayed_root(root);

	if (atomic_read(&delayed_root->items) < BTRFS_DELAYED_BACKGROUND)
		return;

	if (atomic_read(&delayed_root->items) >= BTRFS_DELAYED_WRITEBACK) {
		int ret;
		ret = btrfs_wq_run_delayed_node(delayed_root, root, 1);
		if (ret)
			return;

		wait_event_interruptible_timeout(
				delayed_root->wait,
				(atomic_read(&delayed_root->items) <
				 BTRFS_DELAYED_BACKGROUND),
				HZ);
		return;
	}

	btrfs_wq_run_delayed_node(delayed_root, root, 0);
}

/* Will return 0 or -ENOMEM */
int btrfs_insert_delayed_dir_index(struct btrfs_trans_handle *trans,
				   struct btrfs_root *root, const char *name,
				   int name_len, struct 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);
	btrfs_set_key_type(&delayed_item->key, BTRFS_DIR_INDEX_KEY);
	delayed_item->key.offset = index;

	dir_item = (struct btrfs_dir_item *)delayed_item->data;
	dir_item->location = *disk_key;
	dir_item->transid = cpu_to_le64(trans->transid);
	dir_item->data_len = 0;
	dir_item->name_len = cpu_to_le16(name_len);
	dir_item->type = type;
	memcpy((char *)(dir_item + 1), name, name_len);

	ret = btrfs_delayed_item_reserve_metadata(trans, 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)) {
		printk(KERN_ERR "err add delayed dir index item(name: %s) into "
				"the insertion tree of the delayed node"
				"(root id: %llu, inode id: %llu, errno: %d)\n",
				name,
				(unsigned long long)delayed_node->root->objectid,
				(unsigned long long)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_root *root,
					       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(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_root *root, struct 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);
	btrfs_set_key_type(&item_key, BTRFS_DIR_INDEX_KEY);
	item_key.offset = index;

	ret = btrfs_delete_delayed_insertion_item(root, 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, 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)) {
		printk(KERN_ERR "err add delayed dir index item(index: %llu) "
				"into the deletion tree of the delayed node"
				"(root id: %llu, inode id: %llu, errno: %d)\n",
				(unsigned long long)index,
				(unsigned long long)node->root->objectid,
				(unsigned long long)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 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;
	}

	BTRFS_I(inode)->index_cnt = delayed_node->index_cnt;
	btrfs_release_delayed_node(delayed_node);
	return 0;
}

void btrfs_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(inode);
	if (!delayed_node)
		return;

	mutex_lock(&delayed_node->mutex);
	item = __btrfs_first_delayed_insertion_item(delayed_node);
	while (item) {
		atomic_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) {
		atomic_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.
	 */
	atomic_dec(&delayed_node->refs);
}

void btrfs_put_delayed_items(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 (atomic_dec_and_test(&curr->refs))
			kfree(curr);
	}

	list_for_each_entry_safe(curr, next, del_list, readdir_list) {
		list_del(&curr->readdir_list);
		if (atomic_dec_and_test(&curr->refs))
			kfree(curr);
	}
}

int btrfs_should_delete_dir_index(struct list_head *del_list,
				  u64 index)
{
	struct btrfs_delayed_item *curr, *next;
	int ret;

	if (list_empty(del_list))
		return 0;

	list_for_each_entry_safe(curr, next, del_list, readdir_list) {
		if (curr->key.offset > index)
			break;

		list_del(&curr->readdir_list);
		ret = (curr->key.offset == index);

		if (atomic_dec_and_test(&curr->refs))
			kfree(curr);

		if (ret)
			return 1;
		else
			continue;
	}
	return 0;
}

/*
 * btrfs_readdir_delayed_dir_index - read dir info stored in the delayed tree
 *
 */
int btrfs_readdir_delayed_dir_index(struct file *filp, void *dirent,
				    filldir_t filldir,
				    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 < filp->f_pos) {
			if (atomic_dec_and_test(&curr->refs))
				kfree(curr);
			continue;
		}

		filp->f_pos = curr->key.offset;

		di = (struct btrfs_dir_item *)curr->data;
		name = (char *)(di + 1);
		name_len = le16_to_cpu(di->name_len);

		d_type = btrfs_filetype_table[di->type];
		btrfs_disk_key_to_cpu(&location, &di->location);

		over = filldir(dirent, name, name_len, curr->key.offset,
			       location.objectid, d_type);

		if (atomic_dec_and_test(&curr->refs))
			kfree(curr);

		if (over)
			return 1;
	}
	return 0;
}

BTRFS_SETGET_STACK_FUNCS(stack_inode_generation, struct btrfs_inode_item,
			 generation, 64);
BTRFS_SETGET_STACK_FUNCS(stack_inode_sequence, struct btrfs_inode_item,
			 sequence, 64);
BTRFS_SETGET_STACK_FUNCS(stack_inode_transid, struct btrfs_inode_item,
			 transid, 64);
BTRFS_SETGET_STACK_FUNCS(stack_inode_size, struct btrfs_inode_item, size, 64);
BTRFS_SETGET_STACK_FUNCS(stack_inode_nbytes, struct btrfs_inode_item,
			 nbytes, 64);
BTRFS_SETGET_STACK_FUNCS(stack_inode_block_group, struct btrfs_inode_item,
			 block_group, 64);
BTRFS_SETGET_STACK_FUNCS(stack_inode_nlink, struct btrfs_inode_item, nlink, 32);
BTRFS_SETGET_STACK_FUNCS(stack_inode_uid, struct btrfs_inode_item, uid, 32);
BTRFS_SETGET_STACK_FUNCS(stack_inode_gid, struct btrfs_inode_item, gid, 32);
BTRFS_SETGET_STACK_FUNCS(stack_inode_mode, struct btrfs_inode_item, mode, 32);
BTRFS_SETGET_STACK_FUNCS(stack_inode_rdev, struct btrfs_inode_item, rdev, 64);
BTRFS_SETGET_STACK_FUNCS(stack_inode_flags, struct btrfs_inode_item, flags, 64);

BTRFS_SETGET_STACK_FUNCS(stack_timespec_sec, struct btrfs_timespec, sec, 64);
BTRFS_SETGET_STACK_FUNCS(stack_timespec_nsec, struct btrfs_timespec, nsec, 32);

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->i_version);
	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(btrfs_inode_atime(inode_item),
				     inode->i_atime.tv_sec);
	btrfs_set_stack_timespec_nsec(btrfs_inode_atime(inode_item),
				      inode->i_atime.tv_nsec);

	btrfs_set_stack_timespec_sec(btrfs_inode_mtime(inode_item),
				     inode->i_mtime.tv_sec);
	btrfs_set_stack_timespec_nsec(btrfs_inode_mtime(inode_item),
				      inode->i_mtime.tv_nsec);

	btrfs_set_stack_timespec_sec(btrfs_inode_ctime(inode_item),
				     inode->i_ctime.tv_sec);
	btrfs_set_stack_timespec_nsec(btrfs_inode_ctime(inode_item),
				      inode->i_ctime.tv_nsec);
}

int btrfs_fill_inode(struct inode *inode, u32 *rdev)
{
	struct btrfs_delayed_node *delayed_node;
	struct btrfs_inode_item *inode_item;
	struct btrfs_timespec *tspec;

	delayed_node = btrfs_get_delayed_node(inode);
	if (!delayed_node)
		return -ENOENT;

	mutex_lock(&delayed_node->mutex);
	if (!delayed_node->inode_dirty) {
		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(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);
	inode->i_version = 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);

	tspec = btrfs_inode_atime(inode_item);
	inode->i_atime.tv_sec = btrfs_stack_timespec_sec(tspec);
	inode->i_atime.tv_nsec = btrfs_stack_timespec_nsec(tspec);

	tspec = btrfs_inode_mtime(inode_item);
	inode->i_mtime.tv_sec = btrfs_stack_timespec_sec(tspec);
	inode->i_mtime.tv_nsec = btrfs_stack_timespec_nsec(tspec);

	tspec = btrfs_inode_ctime(inode_item);
	inode->i_ctime.tv_sec = btrfs_stack_timespec_sec(tspec);
	inode->i_ctime.tv_nsec = btrfs_stack_timespec_nsec(tspec);

	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(inode);
	if (IS_ERR(delayed_node))
		return PTR_ERR(delayed_node);

	mutex_lock(&delayed_node->mutex);
	if (delayed_node->inode_dirty) {
		fill_stack_inode_item(trans, &delayed_node->inode_item, inode);
		goto release_node;
	}

	ret = btrfs_delayed_inode_reserve_metadata(trans, root, inode,
						   delayed_node);
	if (ret)
		goto release_node;

	fill_stack_inode_item(trans, &delayed_node->inode_item, inode);
	delayed_node->inode_dirty = 1;
	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;
}

static void __btrfs_kill_delayed_node(struct btrfs_delayed_node *delayed_node)
{
	struct btrfs_root *root = delayed_node->root;
	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 (delayed_node->inode_dirty) {
		btrfs_delayed_inode_release_metadata(root, delayed_node);
		btrfs_release_delayed_inode(delayed_node);
	}
	mutex_unlock(&delayed_node->mutex);
}

void btrfs_kill_delayed_inode_items(struct 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++)
			atomic_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_root *root)
{
	struct btrfs_delayed_root *delayed_root;
	struct btrfs_delayed_node *curr_node, *prev_node;

	delayed_root = btrfs_get_delayed_root(root);

	curr_node = btrfs_first_delayed_node(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);
	}
}