linux/fs/btrfs/tree-mod-log.h

/* 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 btrfs_path *path,
						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