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/types.h> 11 #include <linux/rbtree.h> 12 #include <linux/spinlock.h> 13 #include <linux/mutex.h> 14 #include <linux/list.h> 15 #include <linux/wait.h> 16 #include <linux/fs.h> 17 #include <linux/atomic.h> 18 #include <linux/refcount.h> 19 #include "ctree.h" 20 21 struct btrfs_disk_key; 22 struct btrfs_fs_info; 23 struct btrfs_inode; 24 struct btrfs_root; 25 struct btrfs_trans_handle; 26 27 enum btrfs_delayed_item_type { 28 BTRFS_DELAYED_INSERTION_ITEM, 29 BTRFS_DELAYED_DELETION_ITEM 30 }; 31 32 struct btrfs_delayed_root { 33 spinlock_t lock; 34 struct list_head node_list; 35 /* 36 * Used for delayed nodes which is waiting to be dealt with by the 37 * worker. If the delayed node is inserted into the work queue, we 38 * drop it from this list. 39 */ 40 struct list_head prepare_list; 41 atomic_t items; /* for delayed items */ 42 atomic_t items_seq; /* for delayed items */ 43 int nodes; /* for delayed nodes */ 44 wait_queue_head_t wait; 45 }; 46 47 #define BTRFS_DELAYED_NODE_IN_LIST 0 48 #define BTRFS_DELAYED_NODE_INODE_DIRTY 1 49 #define BTRFS_DELAYED_NODE_DEL_IREF 2 50 51 struct btrfs_delayed_node { 52 u64 inode_id; 53 u64 bytes_reserved; 54 struct btrfs_root *root; 55 /* Used to add the node into the delayed root's node list. */ 56 struct list_head n_list; 57 /* 58 * Used to add the node into the prepare list, the nodes in this list 59 * is waiting to be dealt with by the async worker. 60 */ 61 struct list_head p_list; 62 struct rb_root_cached ins_root; 63 struct rb_root_cached del_root; 64 struct mutex mutex; 65 struct btrfs_inode_item inode_item; 66 refcount_t refs; 67 int count; 68 u64 index_cnt; 69 unsigned long flags; 70 /* 71 * The size of the next batch of dir index items to insert (if this 72 * node is from a directory inode). Protected by @mutex. 73 */ 74 u32 curr_index_batch_size; 75 /* 76 * Number of leaves reserved for inserting dir index items (if this 77 * node belongs to a directory inode). This may be larger then the 78 * actual number of leaves we end up using. Protected by @mutex. 79 */ 80 u32 index_item_leaves; 81 }; 82 83 struct btrfs_delayed_item { 84 struct rb_node rb_node; 85 /* Offset value of the corresponding dir index key. */ 86 u64 index; 87 struct list_head tree_list; /* used for batch insert/delete items */ 88 struct list_head readdir_list; /* used for readdir items */ 89 /* 90 * Used when logging a directory. 91 * Insertions and deletions to this list are protected by the parent 92 * delayed node's mutex. 93 */ 94 struct list_head log_list; 95 u64 bytes_reserved; 96 struct btrfs_delayed_node *delayed_node; 97 refcount_t refs; 98 enum btrfs_delayed_item_type type:8; 99 /* 100 * Track if this delayed item was already logged. 101 * Protected by the mutex of the parent delayed inode. 102 */ 103 bool logged; 104 /* The maximum leaf size is 64K, so u16 is more than enough. */ 105 u16 data_len; 106 char data[] __counted_by(data_len); 107 }; 108 109 void btrfs_init_delayed_root(struct btrfs_delayed_root *delayed_root); 110 int btrfs_insert_delayed_dir_index(struct btrfs_trans_handle *trans, 111 const char *name, int name_len, 112 struct btrfs_inode *dir, 113 const struct btrfs_disk_key *disk_key, u8 flags, 114 u64 index); 115 116 int btrfs_delete_delayed_dir_index(struct btrfs_trans_handle *trans, 117 struct btrfs_inode *dir, u64 index); 118 119 int btrfs_inode_delayed_dir_index_count(struct btrfs_inode *inode); 120 121 int btrfs_run_delayed_items(struct btrfs_trans_handle *trans); 122 int btrfs_run_delayed_items_nr(struct btrfs_trans_handle *trans, int nr); 123 124 void btrfs_balance_delayed_items(struct btrfs_fs_info *fs_info); 125 126 int btrfs_commit_inode_delayed_items(struct btrfs_trans_handle *trans, 127 struct btrfs_inode *inode); 128 /* Used for evicting the inode. */ 129 void btrfs_remove_delayed_node(struct btrfs_inode *inode); 130 void btrfs_kill_delayed_inode_items(struct btrfs_inode *inode); 131 int btrfs_commit_inode_delayed_inode(struct btrfs_inode *inode); 132 133 134 int btrfs_delayed_update_inode(struct btrfs_trans_handle *trans, 135 struct btrfs_inode *inode); 136 int btrfs_fill_inode(struct btrfs_inode *inode, u32 *rdev); 137 int btrfs_delayed_delete_inode_ref(struct btrfs_inode *inode); 138 139 /* Used for drop dead root */ 140 void btrfs_kill_all_delayed_nodes(struct btrfs_root *root); 141 142 /* Used for clean the transaction */ 143 void btrfs_destroy_delayed_inodes(struct btrfs_fs_info *fs_info); 144 145 /* Used for readdir() */ 146 bool btrfs_readdir_get_delayed_items(struct btrfs_inode *inode, 147 u64 last_index, 148 struct list_head *ins_list, 149 struct list_head *del_list); 150 void btrfs_readdir_put_delayed_items(struct btrfs_inode *inode, 151 struct list_head *ins_list, 152 struct list_head *del_list); 153 int btrfs_should_delete_dir_index(const struct list_head *del_list, 154 u64 index); 155 int btrfs_readdir_delayed_dir_index(struct dir_context *ctx, 156 const struct list_head *ins_list); 157 158 /* Used during directory logging. */ 159 void btrfs_log_get_delayed_items(struct btrfs_inode *inode, 160 struct list_head *ins_list, 161 struct list_head *del_list); 162 void btrfs_log_put_delayed_items(struct btrfs_inode *inode, 163 struct list_head *ins_list, 164 struct list_head *del_list); 165 166 /* for init */ 167 int __init btrfs_delayed_inode_init(void); 168 void __cold btrfs_delayed_inode_exit(void); 169 170 /* for debugging */ 171 void btrfs_assert_delayed_root_empty(struct btrfs_fs_info *fs_info); 172 173 #endif 174