linux-imx

/* SPDX-License-Identifier: GPL-2.0 */

/*

 * Copyright (C) 2008 Oracle.  All rights reserved.

 */

​

#ifndef BTRFS_DELAYED_REF_H

#define BTRFS_DELAYED_REF_H

​

#include <linux/refcount.h>

​

/* these are the possible values of struct btrfs_delayed_ref_node->action */

#define BTRFS_ADD_DELAYED_REF    1 /* add one backref to the tree */

#define BTRFS_DROP_DELAYED_REF   2 /* delete one backref from the tree */

#define BTRFS_ADD_DELAYED_EXTENT 3 /* record a full extent allocation */

#define BTRFS_UPDATE_DELAYED_HEAD 4 /* not changing ref count on head ref */

​

struct btrfs_delayed_ref_node {

    struct rb_node ref_node;

    /*

     * If action is BTRFS_ADD_DELAYED_REF, also link this node to

     * ref_head->ref_add_list, then we do not need to iterate the

     * whole ref_head->ref_list to find BTRFS_ADD_DELAYED_REF nodes.

     */

    struct list_head add_list;

​

    /* the starting bytenr of the extent */

    u64 bytenr;

​

    /* the size of the extent */

    u64 num_bytes;

​

    /* seq number to keep track of insertion order */

    u64 seq;

​

    /* ref count on this data structure */

    refcount_t refs;

​

    /*

     * how many refs is this entry adding or deleting.  For

     * head refs, this may be a negative number because it is keeping

     * track of the total mods done to the reference count.

     * For individual refs, this will always be a positive number

     *

     * It may be more than one, since it is possible for a single

     * parent to have more than one ref on an extent

     */

    int ref_mod;

​

    unsigned int action:8;

    unsigned int type:8;

    /* is this node still in the rbtree? */

    unsigned int is_head:1;

    unsigned int in_tree:1;

};

​

struct btrfs_delayed_extent_op {

    struct btrfs_disk_key key;

    u8 level;

    bool update_key;

    bool update_flags;

    bool is_data;

    u64 flags_to_set;

};