LXR linux/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
  23struct 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
  42struct 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_cached ins_root;
  54        struct rb_root_cached 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
  63struct 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
  76static 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
  88int btrfs_insert_delayed_dir_index(struct btrfs_trans_handle *trans,
  89                                   const char *name, int name_len,
  90                                   struct btrfs_inode *dir,
  91                                   struct btrfs_disk_key *disk_key, u8 type,
  92                                   u64 index);
  93
  94int btrfs_delete_delayed_dir_index(struct btrfs_trans_handle *trans,
  95                                   struct btrfs_inode *dir, u64 index);
  96
  97int btrfs_inode_delayed_dir_index_count(struct btrfs_inode *inode);
  98
  99int btrfs_run_delayed_items(struct btrfs_trans_handle *trans);
 100int btrfs_run_delayed_items_nr(struct btrfs_trans_handle *trans, int nr);
 101
 102void btrfs_balance_delayed_items(struct btrfs_fs_info *fs_info);
 103
 104int btrfs_commit_inode_delayed_items(struct btrfs_trans_handle *trans,
 105                                     struct btrfs_inode *inode);
 106/* Used for evicting the inode. */
 107void btrfs_remove_delayed_node(struct btrfs_inode *inode);
 108void btrfs_kill_delayed_inode_items(struct btrfs_inode *inode);
 109int btrfs_commit_inode_delayed_inode(struct btrfs_inode *inode);
 110
 111
 112int btrfs_delayed_update_inode(struct btrfs_trans_handle *trans,
 113                               struct btrfs_root *root, struct inode *inode);
 114int btrfs_fill_inode(struct inode *inode, u32 *rdev);
 115int btrfs_delayed_delete_inode_ref(struct btrfs_inode *inode);
 116
 117/* Used for drop dead root */
 118void btrfs_kill_all_delayed_nodes(struct btrfs_root *root);
 119
 120/* Used for clean the transaction */
 121void btrfs_destroy_delayed_inodes(struct btrfs_fs_info *fs_info);
 122
 123/* Used for readdir() */
 124bool btrfs_readdir_get_delayed_items(struct inode *inode,
 125                                     struct list_head *ins_list,
 126                                     struct list_head *del_list);
 127void btrfs_readdir_put_delayed_items(struct inode *inode,
 128                                     struct list_head *ins_list,
 129                                     struct list_head *del_list);
 130int btrfs_should_delete_dir_index(struct list_head *del_list,
 131                                  u64 index);
 132int btrfs_readdir_delayed_dir_index(struct dir_context *ctx,
 133                                    struct list_head *ins_list);
 134
 135/* for init */
 136int __init btrfs_delayed_inode_init(void);
 137void __cold btrfs_delayed_inode_exit(void);
 138
 139/* for debugging */
 140void btrfs_assert_delayed_root_empty(struct btrfs_fs_info *fs_info);
 141
 142#endif
 143