/* 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_cached ins_root;
  	struct rb_root_cached 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[];

  };
  
  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