fs/btrfs/delayed-inode.h

   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 ins_root;
  54         struct rb_root 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[0];
  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                                    struct btrfs_fs_info *fs_info,
  90                                    const char *name, int name_len,
  91                                    struct btrfs_inode *dir,
  92                                    struct btrfs_disk_key *disk_key, u8 type,
  93                                    u64 index);
  94
  95 int btrfs_delete_delayed_dir_index(struct btrfs_trans_handle *trans,
  96                                    struct btrfs_fs_info *fs_info,
  97                                    struct btrfs_inode *dir, u64 index);
  98
  99 int btrfs_inode_delayed_dir_index_count(struct btrfs_inode *inode);
 100
 101 int btrfs_run_delayed_items(struct btrfs_trans_handle *trans);
 102 int btrfs_run_delayed_items_nr(struct btrfs_trans_handle *trans, int nr);
 103
 104 void btrfs_balance_delayed_items(struct btrfs_fs_info *fs_info);
 105
 106 int btrfs_commit_inode_delayed_items(struct btrfs_trans_handle *trans,
 107                                      struct btrfs_inode *inode);
 108 /* Used for evicting the inode. */
 109 void btrfs_remove_delayed_node(struct btrfs_inode *inode);
 110 void btrfs_kill_delayed_inode_items(struct btrfs_inode *inode);
 111 int btrfs_commit_inode_delayed_inode(struct btrfs_inode *inode);
 112
 113
 114 int btrfs_delayed_update_inode(struct btrfs_trans_handle *trans,
 115                                struct btrfs_root *root, struct inode *inode);
 116 int btrfs_fill_inode(struct inode *inode, u32 *rdev);
 117 int btrfs_delayed_delete_inode_ref(struct btrfs_inode *inode);
 118
 119 /* Used for drop dead root */
 120 void btrfs_kill_all_delayed_nodes(struct btrfs_root *root);
 121
 122 /* Used for clean the transaction */
 123 void btrfs_destroy_delayed_inodes(struct btrfs_fs_info *fs_info);
 124
 125 /* Used for readdir() */
 126 bool btrfs_readdir_get_delayed_items(struct inode *inode,
 127                                      struct list_head *ins_list,
 128                                      struct list_head *del_list);
 129 void btrfs_readdir_put_delayed_items(struct inode *inode,
 130                                      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 dir_context *ctx,
 135                                     struct list_head *ins_list);
 136
 137 /* for init */
 138 int __init btrfs_delayed_inode_init(void);
 139 void __cold btrfs_delayed_inode_exit(void);
 140
 141 /* for debugging */
 142 void btrfs_assert_delayed_root_empty(struct btrfs_fs_info *fs_info);
 143
 144 #endif