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

#ifndef BTRFS_TREE_MOD_LOG_H
#define BTRFS_TREE_MOD_LOG_H

#include <linux/list.h>

struct extent_buffer;
struct btrfs_fs_info;
struct btrfs_path;
struct btrfs_root;
struct btrfs_seq_list;

/* Represents a tree mod log user. */
struct btrfs_seq_list {
        struct list_head list;
        u64 seq;
};

#define BTRFS_SEQ_LIST_INIT(name) { .list = LIST_HEAD_INIT((name).list), .seq = 0 }
#define BTRFS_SEQ_LAST            ((u64)-1)

enum btrfs_mod_log_op {
        BTRFS_MOD_LOG_KEY_REPLACE,
        BTRFS_MOD_LOG_KEY_ADD,
        BTRFS_MOD_LOG_KEY_REMOVE,
        BTRFS_MOD_LOG_KEY_REMOVE_WHILE_FREEING,
        BTRFS_MOD_LOG_KEY_REMOVE_WHILE_MOVING,
        BTRFS_MOD_LOG_MOVE_KEYS,
        BTRFS_MOD_LOG_ROOT_REPLACE,
};

u64 btrfs_get_tree_mod_seq(struct btrfs_fs_info *fs_info,
                           struct btrfs_seq_list *elem);
void btrfs_put_tree_mod_seq(struct btrfs_fs_info *fs_info,
                            struct btrfs_seq_list *elem);
int btrfs_tree_mod_log_insert_root(struct extent_buffer *old_root,
                                   struct extent_buffer *new_root,
                                   bool log_removal);
int btrfs_tree_mod_log_insert_key(const struct extent_buffer *eb, int slot,
                                  enum btrfs_mod_log_op op);
int btrfs_tree_mod_log_free_eb(struct extent_buffer *eb);
struct extent_buffer *btrfs_tree_mod_log_rewind(struct btrfs_fs_info *fs_info,
                                                struct extent_buffer *eb,
                                                u64 time_seq);
struct extent_buffer *btrfs_get_old_root(struct btrfs_root *root, u64 time_seq);
int btrfs_old_root_level(struct btrfs_root *root, u64 time_seq);
int btrfs_tree_mod_log_eb_copy(struct extent_buffer *dst,
                               const struct extent_buffer *src,
                               unsigned long dst_offset,
                               unsigned long src_offset,
                               int nr_items);
int btrfs_tree_mod_log_insert_move(const struct extent_buffer *eb,
                                   int dst_slot, int src_slot,
                                   int nr_items);
u64 btrfs_tree_mod_log_lowest_seq(struct btrfs_fs_info *fs_info);

#endif