1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * Copyright (C) 2011 Fujitsu.  All rights reserved.
4 * Written by Miao Xie <miaox@cn.fujitsu.com>
5 */
6
7#ifndef BTRFS_DELAYED_INODE_H
8#define BTRFS_DELAYED_INODE_H
9
10#include <linux/rbtree.h>
11#include <linux/spinlock.h>
12#include <linux/mutex.h>
13#include <linux/list.h>
14#include <linux/wait.h>
15#include <linux/atomic.h>
16#include <linux/refcount.h>
17#include "ctree.h"
18
19/* types of the delayed item */
20#define BTRFS_DELAYED_INSERTION_ITEM	1
21#define BTRFS_DELAYED_DELETION_ITEM	2
22
23struct btrfs_delayed_root {
24	spinlock_t lock;
25	struct list_head node_list;
26	/*
27	 * Used for delayed nodes which is waiting to be dealt with by the
28	 * worker. If the delayed node is inserted into the work queue, we
29	 * drop it from this list.
30	 */
31	struct list_head prepare_list;
32	atomic_t items;		/* for delayed items */
33	atomic_t items_seq;	/* for delayed items */
34	int nodes;		/* for delayed nodes */
35	wait_queue_head_t wait;
36};
37
38#define BTRFS_DELAYED_NODE_IN_LIST	0
39#define BTRFS_DELAYED_NODE_INODE_DIRTY	1
40#define BTRFS_DELAYED_NODE_DEL_IREF	2
41
42struct btrfs_delayed_node {
43	u64 inode_id;
44	u64 bytes_reserved;
45	struct btrfs_root *root;
46	/* Used to add the node into the delayed root's node list. */
47	struct list_head n_list;
48	/*
49	 * Used to add the node into the prepare list, the nodes in this list
50	 * is waiting to be dealt with by the async worker.
51	 */
52	struct list_head p_list;
53	struct rb_root_cached ins_root;
54	struct rb_root_cached del_root;
55	struct mutex mutex;
56	struct btrfs_inode_item inode_item;
57	refcount_t refs;
58	u64 index_cnt;
59	unsigned long flags;
60	int count;
61};
62
63struct btrfs_delayed_item {
64	struct rb_node rb_node;
65	struct btrfs_key key;
66	struct list_head tree_list;	/* used for batch insert/delete items */
67	struct list_head readdir_list;	/* used for readdir items */
68	u64 bytes_reserved;
69	struct btrfs_delayed_node *delayed_node;
70	refcount_t refs;
71	int ins_or_del;
72	u32 data_len;
73	char data[];
74};
75
76static inline void btrfs_init_delayed_root(
77				struct btrfs_delayed_root *delayed_root)
78{
79	atomic_set(&delayed_root->items, 0);
80	atomic_set(&delayed_root->items_seq, 0);
81	delayed_root->nodes = 0;
82	spin_lock_init(&delayed_root->lock);
83	init_waitqueue_head(&delayed_root->wait);
84	INIT_LIST_HEAD(&delayed_root->node_list);
85	INIT_LIST_HEAD(&delayed_root->prepare_list);
86}
87
88int btrfs_insert_delayed_dir_index(struct btrfs_trans_handle *trans,
89				   const char *name, int name_len,
90				   struct btrfs_inode *dir,
91				   struct btrfs_disk_key *disk_key, u8 type,
92				   u64 index);
93
94int btrfs_delete_delayed_dir_index(struct btrfs_trans_handle *trans,
95				   struct btrfs_inode *dir, u64 index);
96
97int btrfs_inode_delayed_dir_index_count(struct btrfs_inode *inode);
98
99int btrfs_run_delayed_items(struct btrfs_trans_handle *trans);
100int btrfs_run_delayed_items_nr(struct btrfs_trans_handle *trans, int nr);
101
102void btrfs_balance_delayed_items(struct btrfs_fs_info *fs_info);
103
104int btrfs_commit_inode_delayed_items(struct btrfs_trans_handle *trans,
105				     struct btrfs_inode *inode);
106/* Used for evicting the inode. */
107void btrfs_remove_delayed_node(struct btrfs_inode *inode);
108void btrfs_kill_delayed_inode_items(struct btrfs_inode *inode);
109int btrfs_commit_inode_delayed_inode(struct btrfs_inode *inode);
110
111
112int btrfs_delayed_update_inode(struct btrfs_trans_handle *trans,
113			       struct btrfs_root *root, struct inode *inode);
114int btrfs_fill_inode(struct inode *inode, u32 *rdev);
115int btrfs_delayed_delete_inode_ref(struct btrfs_inode *inode);
116
117/* Used for drop dead root */
118void btrfs_kill_all_delayed_nodes(struct btrfs_root *root);
119
120/* Used for clean the transaction */
121void btrfs_destroy_delayed_inodes(struct btrfs_fs_info *fs_info);
122
123/* Used for readdir() */
124bool btrfs_readdir_get_delayed_items(struct inode *inode,
125				     struct list_head *ins_list,
126				     struct list_head *del_list);
127void btrfs_readdir_put_delayed_items(struct inode *inode,
128				     struct list_head *ins_list,
129				     struct list_head *del_list);
130int btrfs_should_delete_dir_index(struct list_head *del_list,
131				  u64 index);
132int btrfs_readdir_delayed_dir_index(struct dir_context *ctx,
133				    struct list_head *ins_list);
134
135/* for init */
136int __init btrfs_delayed_inode_init(void);
137void __cold btrfs_delayed_inode_exit(void);
138
139/* for debugging */
140void btrfs_assert_delayed_root_empty(struct btrfs_fs_info *fs_info);
141
142#endif
143