v4.19.13 snapshot.
diff --git a/fs/btrfs/delayed-inode.h b/fs/btrfs/delayed-inode.h
new file mode 100644
index 0000000..33536cd
--- /dev/null
+++ b/fs/btrfs/delayed-inode.h
@@ -0,0 +1,142 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2011 Fujitsu. All rights reserved.
+ * Written by Miao Xie <miaox@cn.fujitsu.com>
+ */
+
+#ifndef BTRFS_DELAYED_INODE_H
+#define BTRFS_DELAYED_INODE_H
+
+#include <linux/rbtree.h>
+#include <linux/spinlock.h>
+#include <linux/mutex.h>
+#include <linux/list.h>
+#include <linux/wait.h>
+#include <linux/atomic.h>
+#include <linux/refcount.h>
+#include "ctree.h"
+
+/* types of the delayed item */
+#define BTRFS_DELAYED_INSERTION_ITEM 1
+#define BTRFS_DELAYED_DELETION_ITEM 2
+
+struct btrfs_delayed_root {
+ spinlock_t lock;
+ struct list_head node_list;
+ /*
+ * Used for delayed nodes which is waiting to be dealt with by the
+ * worker. If the delayed node is inserted into the work queue, we
+ * drop it from this list.
+ */
+ struct list_head prepare_list;
+ atomic_t items; /* for delayed items */
+ atomic_t items_seq; /* for delayed items */
+ int nodes; /* for delayed nodes */
+ wait_queue_head_t wait;
+};
+
+#define BTRFS_DELAYED_NODE_IN_LIST 0
+#define BTRFS_DELAYED_NODE_INODE_DIRTY 1
+#define BTRFS_DELAYED_NODE_DEL_IREF 2
+
+struct btrfs_delayed_node {
+ u64 inode_id;
+ u64 bytes_reserved;
+ struct btrfs_root *root;
+ /* Used to add the node into the delayed root's node list. */
+ struct list_head n_list;
+ /*
+ * Used to add the node into the prepare list, the nodes in this list
+ * is waiting to be dealt with by the async worker.
+ */
+ struct list_head p_list;
+ struct rb_root ins_root;
+ struct rb_root del_root;
+ struct mutex mutex;
+ struct btrfs_inode_item inode_item;
+ refcount_t refs;
+ u64 index_cnt;
+ unsigned long flags;
+ int count;
+};
+
+struct btrfs_delayed_item {
+ struct rb_node rb_node;
+ struct btrfs_key key;
+ struct list_head tree_list; /* used for batch insert/delete items */
+ struct list_head readdir_list; /* used for readdir items */
+ u64 bytes_reserved;
+ struct btrfs_delayed_node *delayed_node;
+ refcount_t refs;
+ int ins_or_del;
+ u32 data_len;
+ char data[0];
+};
+
+static inline void btrfs_init_delayed_root(
+ struct btrfs_delayed_root *delayed_root)
+{
+ atomic_set(&delayed_root->items, 0);
+ atomic_set(&delayed_root->items_seq, 0);
+ delayed_root->nodes = 0;
+ spin_lock_init(&delayed_root->lock);
+ init_waitqueue_head(&delayed_root->wait);
+ INIT_LIST_HEAD(&delayed_root->node_list);
+ INIT_LIST_HEAD(&delayed_root->prepare_list);
+}
+
+int btrfs_insert_delayed_dir_index(struct btrfs_trans_handle *trans,
+ const char *name, int name_len,
+ struct btrfs_inode *dir,
+ struct btrfs_disk_key *disk_key, u8 type,
+ u64 index);
+
+int btrfs_delete_delayed_dir_index(struct btrfs_trans_handle *trans,
+ struct btrfs_inode *dir, u64 index);
+
+int btrfs_inode_delayed_dir_index_count(struct btrfs_inode *inode);
+
+int btrfs_run_delayed_items(struct btrfs_trans_handle *trans);
+int btrfs_run_delayed_items_nr(struct btrfs_trans_handle *trans, int nr);
+
+void btrfs_balance_delayed_items(struct btrfs_fs_info *fs_info);
+
+int btrfs_commit_inode_delayed_items(struct btrfs_trans_handle *trans,
+ struct btrfs_inode *inode);
+/* Used for evicting the inode. */
+void btrfs_remove_delayed_node(struct btrfs_inode *inode);
+void btrfs_kill_delayed_inode_items(struct btrfs_inode *inode);
+int btrfs_commit_inode_delayed_inode(struct btrfs_inode *inode);
+
+
+int btrfs_delayed_update_inode(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root, struct inode *inode);
+int btrfs_fill_inode(struct inode *inode, u32 *rdev);
+int btrfs_delayed_delete_inode_ref(struct btrfs_inode *inode);
+
+/* Used for drop dead root */
+void btrfs_kill_all_delayed_nodes(struct btrfs_root *root);
+
+/* Used for clean the transaction */
+void btrfs_destroy_delayed_inodes(struct btrfs_fs_info *fs_info);
+
+/* Used for readdir() */
+bool btrfs_readdir_get_delayed_items(struct inode *inode,
+ struct list_head *ins_list,
+ struct list_head *del_list);
+void btrfs_readdir_put_delayed_items(struct inode *inode,
+ struct list_head *ins_list,
+ struct list_head *del_list);
+int btrfs_should_delete_dir_index(struct list_head *del_list,
+ u64 index);
+int btrfs_readdir_delayed_dir_index(struct dir_context *ctx,
+ struct list_head *ins_list);
+
+/* for init */
+int __init btrfs_delayed_inode_init(void);
+void __cold btrfs_delayed_inode_exit(void);
+
+/* for debugging */
+void btrfs_assert_delayed_root_empty(struct btrfs_fs_info *fs_info);
+
+#endif