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 <linux/list.h>
   7
   8 struct extent_buffer;
   9 struct btrfs_fs_info;
  10 struct btrfs_path;
  11 struct btrfs_root;
  12 struct btrfs_seq_list;
  13
  14 /* Represents a tree mod log user. */
  15 struct btrfs_seq_list {
  16         struct list_head list;
  17         u64 seq;
  18 };
  19
  20 #define BTRFS_SEQ_LIST_INIT(name) { .list = LIST_HEAD_INIT((name).list), .seq = 0 }
  21 #define BTRFS_SEQ_LAST            ((u64)-1)
  22
  23 enum btrfs_mod_log_op {
  24         BTRFS_MOD_LOG_KEY_REPLACE,
  25         BTRFS_MOD_LOG_KEY_ADD,
  26         BTRFS_MOD_LOG_KEY_REMOVE,
  27         BTRFS_MOD_LOG_KEY_REMOVE_WHILE_FREEING,
  28         BTRFS_MOD_LOG_KEY_REMOVE_WHILE_MOVING,
  29         BTRFS_MOD_LOG_MOVE_KEYS,
  30         BTRFS_MOD_LOG_ROOT_REPLACE,
  31 };
  32
  33 u64 btrfs_get_tree_mod_seq(struct btrfs_fs_info *fs_info,
  34                            struct btrfs_seq_list *elem);
  35 void btrfs_put_tree_mod_seq(struct btrfs_fs_info *fs_info,
  36                             struct btrfs_seq_list *elem);
  37 int btrfs_tree_mod_log_insert_root(struct extent_buffer *old_root,
  38                                    struct extent_buffer *new_root,
  39                                    bool log_removal);
  40 int btrfs_tree_mod_log_insert_key(const struct extent_buffer *eb, int slot,
  41                                   enum btrfs_mod_log_op op);
  42 int btrfs_tree_mod_log_free_eb(struct extent_buffer *eb);
  43 struct extent_buffer *btrfs_tree_mod_log_rewind(struct btrfs_fs_info *fs_info,
  44                                                 struct extent_buffer *eb,
  45                                                 u64 time_seq);
  46 struct extent_buffer *btrfs_get_old_root(struct btrfs_root *root, u64 time_seq);
  47 int btrfs_old_root_level(struct btrfs_root *root, u64 time_seq);
  48 int btrfs_tree_mod_log_eb_copy(struct extent_buffer *dst,
  49                                const struct extent_buffer *src,
  50                                unsigned long dst_offset,
  51                                unsigned long src_offset,
  52                                int nr_items);
  53 int btrfs_tree_mod_log_insert_move(const struct extent_buffer *eb,
  54                                    int dst_slot, int src_slot,
  55                                    int nr_items);
  56 u64 btrfs_tree_mod_log_lowest_seq(struct btrfs_fs_info *fs_info);
  57
  58 #endif