Line data    Source code

       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             : enum btrfs_delayed_item_type {
      20             :         BTRFS_DELAYED_INSERTION_ITEM,
      21             :         BTRFS_DELAYED_DELETION_ITEM
      22             : };
      23             : 
      24             : struct btrfs_delayed_root {
      25             :         spinlock_t lock;
      26             :         struct list_head node_list;
      27             :         /*
      28             :          * Used for delayed nodes which is waiting to be dealt with by the
      29             :          * worker. If the delayed node is inserted into the work queue, we
      30             :          * drop it from this list.
      31             :          */
      32             :         struct list_head prepare_list;
      33             :         atomic_t items;         /* for delayed items */
      34             :         atomic_t items_seq;     /* for delayed items */
      35             :         int nodes;              /* for delayed nodes */
      36             :         wait_queue_head_t wait;
      37             : };
      38             : 
      39             : #define BTRFS_DELAYED_NODE_IN_LIST      0
      40             : #define BTRFS_DELAYED_NODE_INODE_DIRTY  1
      41             : #define BTRFS_DELAYED_NODE_DEL_IREF     2
      42             : 
      43             : struct btrfs_delayed_node {
      44             :         u64 inode_id;
      45             :         u64 bytes_reserved;
      46             :         struct btrfs_root *root;
      47             :         /* Used to add the node into the delayed root's node list. */
      48             :         struct list_head n_list;
      49             :         /*
      50             :          * Used to add the node into the prepare list, the nodes in this list
      51             :          * is waiting to be dealt with by the async worker.
      52             :          */
      53             :         struct list_head p_list;
      54             :         struct rb_root_cached ins_root;
      55             :         struct rb_root_cached del_root;
      56             :         struct mutex mutex;
      57             :         struct btrfs_inode_item inode_item;
      58             :         refcount_t refs;
      59             :         u64 index_cnt;
      60             :         unsigned long flags;
      61             :         int count;
      62             :         /*
      63             :          * The size of the next batch of dir index items to insert (if this
      64             :          * node is from a directory inode). Protected by @mutex.
      65             :          */
      66             :         u32 curr_index_batch_size;
      67             :         /*
      68             :          * Number of leaves reserved for inserting dir index items (if this
      69             :          * node belongs to a directory inode). This may be larger then the
      70             :          * actual number of leaves we end up using. Protected by @mutex.
      71             :          */
      72             :         u32 index_item_leaves;
      73             : };
      74             : 
      75             : struct btrfs_delayed_item {
      76             :         struct rb_node rb_node;
      77             :         /* Offset value of the corresponding dir index key. */
      78             :         u64 index;
      79             :         struct list_head tree_list;     /* used for batch insert/delete items */
      80             :         struct list_head readdir_list;  /* used for readdir items */
      81             :         /*
      82             :          * Used when logging a directory.
      83             :          * Insertions and deletions to this list are protected by the parent
      84             :          * delayed node's mutex.
      85             :          */
      86             :         struct list_head log_list;
      87             :         u64 bytes_reserved;
      88             :         struct btrfs_delayed_node *delayed_node;
      89             :         refcount_t refs;
      90             :         enum btrfs_delayed_item_type type:8;
      91             :         /*
      92             :          * Track if this delayed item was already logged.
      93             :          * Protected by the mutex of the parent delayed inode.
      94             :          */
      95             :         bool logged;
      96             :         /* The maximum leaf size is 64K, so u16 is more than enough. */
      97             :         u16 data_len;
      98             :         char data[];
      99             : };
     100             : 
     101           0 : static inline void btrfs_init_delayed_root(
     102             :                                 struct btrfs_delayed_root *delayed_root)
     103             : {
     104           0 :         atomic_set(&delayed_root->items, 0);
     105           0 :         atomic_set(&delayed_root->items_seq, 0);
     106           0 :         delayed_root->nodes = 0;
     107           0 :         spin_lock_init(&delayed_root->lock);
     108           0 :         init_waitqueue_head(&delayed_root->wait);
     109           0 :         INIT_LIST_HEAD(&delayed_root->node_list);
     110           0 :         INIT_LIST_HEAD(&delayed_root->prepare_list);
     111           0 : }
     112             : 
     113             : int btrfs_insert_delayed_dir_index(struct btrfs_trans_handle *trans,
     114             :                                    const char *name, int name_len,
     115             :                                    struct btrfs_inode *dir,
     116             :                                    struct btrfs_disk_key *disk_key, u8 flags,
     117             :                                    u64 index);
     118             : 
     119             : int btrfs_delete_delayed_dir_index(struct btrfs_trans_handle *trans,
     120             :                                    struct btrfs_inode *dir, u64 index);
     121             : 
     122             : int btrfs_inode_delayed_dir_index_count(struct btrfs_inode *inode);
     123             : 
     124             : int btrfs_run_delayed_items(struct btrfs_trans_handle *trans);
     125             : int btrfs_run_delayed_items_nr(struct btrfs_trans_handle *trans, int nr);
     126             : 
     127             : void btrfs_balance_delayed_items(struct btrfs_fs_info *fs_info);
     128             : 
     129             : int btrfs_commit_inode_delayed_items(struct btrfs_trans_handle *trans,
     130             :                                      struct btrfs_inode *inode);
     131             : /* Used for evicting the inode. */
     132             : void btrfs_remove_delayed_node(struct btrfs_inode *inode);
     133             : void btrfs_kill_delayed_inode_items(struct btrfs_inode *inode);
     134             : int btrfs_commit_inode_delayed_inode(struct btrfs_inode *inode);
     135             : 
     136             : 
     137             : int btrfs_delayed_update_inode(struct btrfs_trans_handle *trans,
     138             :                                struct btrfs_root *root,
     139             :                                struct btrfs_inode *inode);
     140             : int btrfs_fill_inode(struct inode *inode, u32 *rdev);
     141             : int btrfs_delayed_delete_inode_ref(struct btrfs_inode *inode);
     142             : 
     143             : /* Used for drop dead root */
     144             : void btrfs_kill_all_delayed_nodes(struct btrfs_root *root);
     145             : 
     146             : /* Used for clean the transaction */
     147             : void btrfs_destroy_delayed_inodes(struct btrfs_fs_info *fs_info);
     148             : 
     149             : /* Used for readdir() */
     150             : bool btrfs_readdir_get_delayed_items(struct inode *inode,
     151             :                                      struct list_head *ins_list,
     152             :                                      struct list_head *del_list);
     153             : void btrfs_readdir_put_delayed_items(struct inode *inode,
     154             :                                      struct list_head *ins_list,
     155             :                                      struct list_head *del_list);
     156             : int btrfs_should_delete_dir_index(struct list_head *del_list,
     157             :                                   u64 index);
     158             : int btrfs_readdir_delayed_dir_index(struct dir_context *ctx,
     159             :                                     struct list_head *ins_list);
     160             : 
     161             : /* Used during directory logging. */
     162             : void btrfs_log_get_delayed_items(struct btrfs_inode *inode,
     163             :                                  struct list_head *ins_list,
     164             :                                  struct list_head *del_list);
     165             : void btrfs_log_put_delayed_items(struct btrfs_inode *inode,
     166             :                                  struct list_head *ins_list,
     167             :                                  struct list_head *del_list);
     168             : 
     169             : /* for init */
     170             : int __init btrfs_delayed_inode_init(void);
     171             : void __cold btrfs_delayed_inode_exit(void);
     172             : 
     173             : /* for debugging */
     174             : void btrfs_assert_delayed_root_empty(struct btrfs_fs_info *fs_info);
     175             : 
     176             : #endif