GNU Linux-libre 5.19-rc6-gnu
[releases.git] / fs / btrfs / tree-mod-log.h
1 // SPDX-License-Identifier: GPL-2.0
2
3 #ifndef BTRFS_TREE_MOD_LOG_H
4 #define BTRFS_TREE_MOD_LOG_H
5
6 #include "ctree.h"
7
8 /* Represents a tree mod log user. */
9 struct btrfs_seq_list {
10         struct list_head list;
11         u64 seq;
12 };
13
14 #define BTRFS_SEQ_LIST_INIT(name) { .list = LIST_HEAD_INIT((name).list), .seq = 0 }
15 #define BTRFS_SEQ_LAST            ((u64)-1)
16
17 enum btrfs_mod_log_op {
18         BTRFS_MOD_LOG_KEY_REPLACE,
19         BTRFS_MOD_LOG_KEY_ADD,
20         BTRFS_MOD_LOG_KEY_REMOVE,
21         BTRFS_MOD_LOG_KEY_REMOVE_WHILE_FREEING,
22         BTRFS_MOD_LOG_KEY_REMOVE_WHILE_MOVING,
23         BTRFS_MOD_LOG_MOVE_KEYS,
24         BTRFS_MOD_LOG_ROOT_REPLACE,
25 };
26
27 u64 btrfs_get_tree_mod_seq(struct btrfs_fs_info *fs_info,
28                            struct btrfs_seq_list *elem);
29 void btrfs_put_tree_mod_seq(struct btrfs_fs_info *fs_info,
30                             struct btrfs_seq_list *elem);
31 int btrfs_tree_mod_log_insert_root(struct extent_buffer *old_root,
32                                    struct extent_buffer *new_root,
33                                    bool log_removal);
34 int btrfs_tree_mod_log_insert_key(struct extent_buffer *eb, int slot,
35                                   enum btrfs_mod_log_op op, gfp_t flags);
36 int btrfs_tree_mod_log_free_eb(struct extent_buffer *eb);
37 struct extent_buffer *btrfs_tree_mod_log_rewind(struct btrfs_fs_info *fs_info,
38                                                 struct btrfs_path *path,
39                                                 struct extent_buffer *eb,
40                                                 u64 time_seq);
41 struct extent_buffer *btrfs_get_old_root(struct btrfs_root *root, u64 time_seq);
42 int btrfs_old_root_level(struct btrfs_root *root, u64 time_seq);
43 int btrfs_tree_mod_log_eb_copy(struct extent_buffer *dst,
44                                struct extent_buffer *src,
45                                unsigned long dst_offset,
46                                unsigned long src_offset,
47                                int nr_items);
48 int btrfs_tree_mod_log_insert_move(struct extent_buffer *eb,
49                                    int dst_slot, int src_slot,
50                                    int nr_items);
51 u64 btrfs_tree_mod_log_lowest_seq(struct btrfs_fs_info *fs_info);
52
53 #endif