fs/btrfs/delayed-inode.h

   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         atomic_t items_seq;     /* for delayed items */
  47         int nodes;              /* for delayed nodes */
  48         wait_queue_head_t wait;
  49 };
  50
  51 #define BTRFS_DELAYED_NODE_IN_LIST      0
  52 #define BTRFS_DELAYED_NODE_INODE_DIRTY  1
  53 #define BTRFS_DELAYED_NODE_DEL_IREF     2
  54
  55 struct btrfs_delayed_node {
  56         u64 inode_id;
  57         u64 bytes_reserved;
  58         struct btrfs_root *root;
  59         /* Used to add the node into the delayed root's node list. */
  60         struct list_head n_list;
  61         /*
  62          * Used to add the node into the prepare list, the nodes in this list
  63          * is waiting to be dealt with by the async worker.
  64          */
  65         struct list_head p_list;
  66         struct rb_root ins_root;
  67         struct rb_root del_root;
  68         struct mutex mutex;
  69         struct btrfs_inode_item inode_item;
  70         atomic_t refs;
  71         u64 index_cnt;
  72         unsigned long flags;
  73         int count;
  74 };
  75
  76 struct btrfs_delayed_item {
  77         struct rb_node rb_node;
  78         struct btrfs_key key;
  79         struct list_head tree_list;     /* used for batch insert/delete items */
  80         struct list_head readdir_list;  /* used for readdir items */
  81         u64 bytes_reserved;
  82         struct btrfs_delayed_node *delayed_node;
  83         atomic_t refs;
  84         int ins_or_del;
  85         u32 data_len;
  86         char data[0];
  87 };
  88
  89 static inline void btrfs_init_delayed_root(
  90                                 struct btrfs_delayed_root *delayed_root)
  91 {
  92         atomic_set(&delayed_root->items, 0);
  93         atomic_set(&delayed_root->items_seq, 0);
  94         delayed_root->nodes = 0;
  95         spin_lock_init(&delayed_root->lock);
  96         init_waitqueue_head(&delayed_root->wait);
  97         INIT_LIST_HEAD(&delayed_root->node_list);
  98         INIT_LIST_HEAD(&delayed_root->prepare_list);
  99 }
 100
 101 int btrfs_insert_delayed_dir_index(struct btrfs_trans_handle *trans,
 102                                    struct btrfs_root *root, const char *name,
 103                                    int name_len, struct inode *dir,
 104                                    struct btrfs_disk_key *disk_key, u8 type,
 105                                    u64 index);
 106
 107 int btrfs_delete_delayed_dir_index(struct btrfs_trans_handle *trans,
 108                                    struct btrfs_root *root, struct inode *dir,
 109                                    u64 index);
 110
 111 int btrfs_inode_delayed_dir_index_count(struct inode *inode);
 112
 113 int btrfs_run_delayed_items(struct btrfs_trans_handle *trans,
 114                             struct btrfs_root *root);
 115 int btrfs_run_delayed_items_nr(struct btrfs_trans_handle *trans,
 116                                struct btrfs_root *root, int nr);
 117
 118 void btrfs_balance_delayed_items(struct btrfs_root *root);
 119
 120 int btrfs_commit_inode_delayed_items(struct btrfs_trans_handle *trans,
 121                                      struct inode *inode);
 122 /* Used for evicting the inode. */
 123 void btrfs_remove_delayed_node(struct inode *inode);
 124 void btrfs_kill_delayed_inode_items(struct inode *inode);
 125 int btrfs_commit_inode_delayed_inode(struct inode *inode);
 126
 127
 128 int btrfs_delayed_update_inode(struct btrfs_trans_handle *trans,
 129                                struct btrfs_root *root, struct inode *inode);
 130 int btrfs_fill_inode(struct inode *inode, u32 *rdev);
 131 int btrfs_delayed_delete_inode_ref(struct inode *inode);
 132
 133 /* Used for drop dead root */
 134 void btrfs_kill_all_delayed_nodes(struct btrfs_root *root);
 135
 136 /* Used for clean the transaction */
 137 void btrfs_destroy_delayed_inodes(struct btrfs_root *root);
 138
 139 /* Used for readdir() */
 140 bool btrfs_readdir_get_delayed_items(struct inode *inode,
 141                                      struct list_head *ins_list,
 142                                      struct list_head *del_list);
 143 void btrfs_readdir_put_delayed_items(struct inode *inode,
 144                                      struct list_head *ins_list,
 145                                      struct list_head *del_list);
 146 int btrfs_should_delete_dir_index(struct list_head *del_list,
 147                                   u64 index);
 148 int btrfs_readdir_delayed_dir_index(struct dir_context *ctx,
 149                                     struct list_head *ins_list, bool *emitted);
 150
 151 /* for init */
 152 int __init btrfs_delayed_inode_init(void);
 153 void btrfs_delayed_inode_exit(void);
 154
 155 /* for debugging */
 156 void btrfs_assert_delayed_root_empty(struct btrfs_root *root);
 157
 158 #endif