LXR linux/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
  36struct 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
  55struct 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
  76struct 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
  89static 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
 101int 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
 107int btrfs_delete_delayed_dir_index(struct btrfs_trans_handle *trans,
 108                                   struct btrfs_root *root, struct inode *dir,
 109                                   u64 index);
 110
 111int btrfs_inode_delayed_dir_index_count(struct inode *inode);
 112
 113int btrfs_run_delayed_items(struct btrfs_trans_handle *trans,
 114                            struct btrfs_root *root);
 115int btrfs_run_delayed_items_nr(struct btrfs_trans_handle *trans,
 116                               struct btrfs_root *root, int nr);
 117
 118void btrfs_balance_delayed_items(struct btrfs_root *root);
 119
 120int btrfs_commit_inode_delayed_items(struct btrfs_trans_handle *trans,
 121                                     struct inode *inode);
 122/* Used for evicting the inode. */
 123void btrfs_remove_delayed_node(struct inode *inode);
 124void btrfs_kill_delayed_inode_items(struct inode *inode);
 125int btrfs_commit_inode_delayed_inode(struct inode *inode);
 126
 127
 128int btrfs_delayed_update_inode(struct btrfs_trans_handle *trans,
 129                               struct btrfs_root *root, struct inode *inode);
 130int btrfs_fill_inode(struct inode *inode, u32 *rdev);
 131int btrfs_delayed_delete_inode_ref(struct inode *inode);
 132
 133/* Used for drop dead root */
 134void btrfs_kill_all_delayed_nodes(struct btrfs_root *root);
 135
 136/* Used for clean the transaction */
 137void btrfs_destroy_delayed_inodes(struct btrfs_root *root);
 138
 139/* Used for readdir() */
 140void btrfs_get_delayed_items(struct inode *inode, struct list_head *ins_list,
 141                             struct list_head *del_list);
 142void btrfs_put_delayed_items(struct list_head *ins_list,
 143                             struct list_head *del_list);
 144int btrfs_should_delete_dir_index(struct list_head *del_list,
 145                                  u64 index);
 146int btrfs_readdir_delayed_dir_index(struct dir_context *ctx,
 147                                    struct list_head *ins_list, bool *emitted);
 148
 149/* for init */
 150int __init btrfs_delayed_inode_init(void);
 151void btrfs_delayed_inode_exit(void);
 152
 153/* for debugging */
 154void btrfs_assert_delayed_root_empty(struct btrfs_root *root);
 155
 156#endif
 157