1 /* 2 * Copyright (C) 2011 Fujitsu. All rights reserved. 3 * Written by Miao Xie <miaox@cn.fujitsu.com> 4 * 5 * This program is free software; you can redistribute it and/or 6 * modify it under the terms of the GNU General Public 7 * License v2 as published by the Free Software Foundation. 8 * 9 * This program is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12 * General Public License for more details. 13 * 14 * You should have received a copy of the GNU General Public 15 * License along with this program; if not, write to the 16 * Free Software Foundation, Inc., 59 Temple Place - Suite 330, 17 * Boston, MA 021110-1307, USA. 18 */ 19 20 #ifndef __DELAYED_TREE_OPERATION_H 21 #define __DELAYED_TREE_OPERATION_H 22 23 #include <linux/rbtree.h> 24 #include <linux/spinlock.h> 25 #include <linux/mutex.h> 26 #include <linux/list.h> 27 #include <linux/wait.h> 28 #include <linux/atomic.h> 29 30 #include "ctree.h" 31 32 /* types of the delayed item */ 33 #define BTRFS_DELAYED_INSERTION_ITEM 1 34 #define BTRFS_DELAYED_DELETION_ITEM 2 35 36 struct btrfs_delayed_root { 37 spinlock_t lock; 38 struct list_head node_list; 39 /* 40 * Used for delayed nodes which is waiting to be dealt with by the 41 * worker. If the delayed node is inserted into the work queue, we 42 * drop it from this list. 43 */ 44 struct list_head prepare_list; 45 atomic_t items; /* for delayed items */ 46 int nodes; /* for delayed nodes */ 47 wait_queue_head_t wait; 48 }; 49 50 struct btrfs_delayed_node { 51 u64 inode_id; 52 u64 bytes_reserved; 53 struct btrfs_root *root; 54 /* Used to add the node into the delayed root's node list. */ 55 struct list_head n_list; 56 /* 57 * Used to add the node into the prepare list, the nodes in this list 58 * is waiting to be dealt with by the async worker. 59 */ 60 struct list_head p_list; 61 struct rb_root ins_root; 62 struct rb_root del_root; 63 struct mutex mutex; 64 struct btrfs_inode_item inode_item; 65 atomic_t refs; 66 u64 index_cnt; 67 bool in_list; 68 bool inode_dirty; 69 int count; 70 }; 71 72 struct btrfs_delayed_item { 73 struct rb_node rb_node; 74 struct btrfs_key key; 75 struct list_head tree_list; /* used for batch insert/delete items */ 76 struct list_head readdir_list; /* used for readdir items */ 77 u64 bytes_reserved; 78 struct btrfs_delayed_node *delayed_node; 79 atomic_t refs; 80 int ins_or_del; 81 u32 data_len; 82 char data[0]; 83 }; 84 85 static inline void btrfs_init_delayed_root( 86 struct btrfs_delayed_root *delayed_root) 87 { 88 atomic_set(&delayed_root->items, 0); 89 delayed_root->nodes = 0; 90 spin_lock_init(&delayed_root->lock); 91 init_waitqueue_head(&delayed_root->wait); 92 INIT_LIST_HEAD(&delayed_root->node_list); 93 INIT_LIST_HEAD(&delayed_root->prepare_list); 94 } 95 96 int btrfs_insert_delayed_dir_index(struct btrfs_trans_handle *trans, 97 struct btrfs_root *root, const char *name, 98 int name_len, struct inode *dir, 99 struct btrfs_disk_key *disk_key, u8 type, 100 u64 index); 101 102 int btrfs_delete_delayed_dir_index(struct btrfs_trans_handle *trans, 103 struct btrfs_root *root, struct inode *dir, 104 u64 index); 105 106 int btrfs_inode_delayed_dir_index_count(struct inode *inode); 107 108 int btrfs_run_delayed_items(struct btrfs_trans_handle *trans, 109 struct btrfs_root *root); 110 111 void btrfs_balance_delayed_items(struct btrfs_root *root); 112 113 int btrfs_commit_inode_delayed_items(struct btrfs_trans_handle *trans, 114 struct inode *inode); 115 /* Used for evicting the inode. */ 116 void btrfs_remove_delayed_node(struct inode *inode); 117 void btrfs_kill_delayed_inode_items(struct inode *inode); 118 119 120 int btrfs_delayed_update_inode(struct btrfs_trans_handle *trans, 121 struct btrfs_root *root, struct inode *inode); 122 int btrfs_fill_inode(struct inode *inode, u32 *rdev); 123 124 /* Used for drop dead root */ 125 void btrfs_kill_all_delayed_nodes(struct btrfs_root *root); 126 127 /* Used for readdir() */ 128 void btrfs_get_delayed_items(struct inode *inode, struct list_head *ins_list, 129 struct list_head *del_list); 130 void btrfs_put_delayed_items(struct list_head *ins_list, 131 struct list_head *del_list); 132 int btrfs_should_delete_dir_index(struct list_head *del_list, 133 u64 index); 134 int btrfs_readdir_delayed_dir_index(struct file *filp, void *dirent, 135 filldir_t filldir, 136 struct list_head *ins_list); 137 138 /* for init */ 139 int __init btrfs_delayed_inode_init(void); 140 void btrfs_delayed_inode_exit(void); 141 142 /* for debugging */ 143 void btrfs_assert_delayed_root_empty(struct btrfs_root *root); 144 145 #endif 146