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 23 struct 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 42 struct 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 63 struct 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 76 static 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 88 int 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 94 int btrfs_delete_delayed_dir_index(struct btrfs_trans_handle *trans, 95 struct btrfs_inode *dir, u64 index); 96 97 int btrfs_inode_delayed_dir_index_count(struct btrfs_inode *inode); 98 99 int btrfs_run_delayed_items(struct btrfs_trans_handle *trans); 100 int btrfs_run_delayed_items_nr(struct btrfs_trans_handle *trans, int nr); 101 102 void btrfs_balance_delayed_items(struct btrfs_fs_info *fs_info); 103 104 int btrfs_commit_inode_delayed_items(struct btrfs_trans_handle *trans, 105 struct btrfs_inode *inode); 106 /* Used for evicting the inode. */ 107 void btrfs_remove_delayed_node(struct btrfs_inode *inode); 108 void btrfs_kill_delayed_inode_items(struct btrfs_inode *inode); 109 int btrfs_commit_inode_delayed_inode(struct btrfs_inode *inode); 110 111 112 int btrfs_delayed_update_inode(struct btrfs_trans_handle *trans, 113 struct btrfs_root *root, struct inode *inode); 114 int btrfs_fill_inode(struct inode *inode, u32 *rdev); 115 int btrfs_delayed_delete_inode_ref(struct btrfs_inode *inode); 116 117 /* Used for drop dead root */ 118 void btrfs_kill_all_delayed_nodes(struct btrfs_root *root); 119 120 /* Used for clean the transaction */ 121 void btrfs_destroy_delayed_inodes(struct btrfs_fs_info *fs_info); 122 123 /* Used for readdir() */ 124 bool btrfs_readdir_get_delayed_items(struct inode *inode, 125 struct list_head *ins_list, 126 struct list_head *del_list); 127 void btrfs_readdir_put_delayed_items(struct inode *inode, 128 struct list_head *ins_list, 129 struct list_head *del_list); 130 int btrfs_should_delete_dir_index(struct list_head *del_list, 131 u64 index); 132 int btrfs_readdir_delayed_dir_index(struct dir_context *ctx, 133 struct list_head *ins_list); 134 135 /* for init */ 136 int __init btrfs_delayed_inode_init(void); 137 void __cold btrfs_delayed_inode_exit(void); 138 139 /* for debugging */ 140 void btrfs_assert_delayed_root_empty(struct btrfs_fs_info *fs_info); 141 142 #endif 143