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