LXR linux/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. */
   9struct 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
  17enum 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
  27u64 btrfs_get_tree_mod_seq(struct btrfs_fs_info *fs_info,
  28                           struct btrfs_seq_list *elem);
  29void btrfs_put_tree_mod_seq(struct btrfs_fs_info *fs_info,
  30                            struct btrfs_seq_list *elem);
  31int btrfs_tree_mod_log_insert_root(struct extent_buffer *old_root,
  32                                   struct extent_buffer *new_root,
  33                                   bool log_removal);
  34int btrfs_tree_mod_log_insert_key(struct extent_buffer *eb, int slot,
  35                                  enum btrfs_mod_log_op op, gfp_t flags);
  36int btrfs_tree_mod_log_free_eb(struct extent_buffer *eb);
  37struct 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);
  41struct extent_buffer *btrfs_get_old_root(struct btrfs_root *root, u64 time_seq);
  42int btrfs_old_root_level(struct btrfs_root *root, u64 time_seq);
  43int 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);
  48int btrfs_tree_mod_log_insert_move(struct extent_buffer *eb,
  49                                   int dst_slot, int src_slot,
  50                                   int nr_items);
  51u64 btrfs_tree_mod_log_lowest_seq(struct btrfs_fs_info *fs_info);
  52
  53#endif
  54