text: #ifndef MDBOX_STORAGE_H
  #define MDBOX_STORAGE_H
  
  #include "index-storage.h"
  #include "dbox-storage.h"
  #include "mdbox-settings.h"
  
  #define MDBOX_STORAGE_NAME "mdbox"
  #define MDBOX_DELETED_STORAGE_NAME "mdbox_deleted"
  #define MDBOX_GLOBAL_INDEX_PREFIX "dovecot.map.index"
  #define MDBOX_GLOBAL_DIR_NAME "storage"
  #define MDBOX_MAIL_FILE_PREFIX "m."
  #define MDBOX_MAIL_FILE_FORMAT MDBOX_MAIL_FILE_PREFIX"%u"
  #define MDBOX_MAX_OPEN_UNUSED_FILES 2
  #define MDBOX_CLOSE_UNUSED_FILES_TIMEOUT_SECS 30
  
  #define MDBOX_INDEX_HEADER_MIN_SIZE (sizeof(uint32_t))
  struct mdbox_index_header {
  	uint32_t map_uid_validity;
  	guid_128_t mailbox_guid;
  	uint8_t flags; /* enum dbox_index_header_flags */
  	uint8_t unused[3];
  };
  
  struct mdbox_storage {
  	struct dbox_storage storage;
  	const struct mdbox_settings *set;
  
  	/* paths for storage directories */
  	const char *storage_dir, *alt_storage_dir;
  	struct mdbox_map *map;
  
  	ARRAY(struct mdbox_file *) open_files;
  	struct timeout *to_close_unused_files;
  
  	ARRAY_TYPE(uint32_t) move_to_alt_map_uids;
  	ARRAY_TYPE(uint32_t) move_from_alt_map_uids;
  
  	/* if non-zero, storage should be rebuilt (except if rebuild_count
  	   has changed from this value) */
  	uint32_t corrupted_rebuild_count;
  
  	unsigned int corrupted:1;
  	unsigned int rebuilding_storage:1;
  	unsigned int preallocate_space:1;
  };
  
  struct mdbox_mail_index_record {
  	uint32_t map_uid;
  	/* UNIX timestamp of when the message was saved/copied to this
  	   mailbox */
  	uint32_t save_date;
  };
  
  struct mdbox_mailbox {
  	struct mailbox box;
  	struct mdbox_storage *storage;
  
  	uint32_t map_uid_validity;
  	uint32_t ext_id, hdr_ext_id, guid_ext_id;
  
  	unsigned int mdbox_deleted_synced:1;
  	unsigned int creating:1;
  };
  
  extern struct dbox_storage_vfuncs mdbox_dbox_storage_vfuncs;
  extern struct mail_vfuncs mdbox_mail_vfuncs;
  
  int mdbox_mail_open(struct dbox_mail *mail, uoff_t *offset_r,
  		    struct dbox_file **file_r);
  
  /* Get map_uid for wanted message. */
  int mdbox_mail_lookup(struct mdbox_mailbox *mbox, struct mail_index_view *view,
  		      uint32_t seq, uint32_t *map_uid_r);
  uint32_t dbox_get_uidvalidity_next(struct mailbox_list *list);
  int mdbox_read_header(struct mdbox_mailbox *mbox,
  		      struct mdbox_index_header *hdr, bool *need_resize_r);
  void mdbox_update_header(struct mdbox_mailbox *mbox,
  			 struct mail_index_transaction *trans,
  			 const struct mailbox_update *update) ATTR_NULL(3);
  int mdbox_mailbox_create_indexes(struct mailbox *box,
  				 const struct mailbox_update *update,
  				 struct mail_index_transaction *trans);
  
  struct mail_save_context *
  mdbox_save_alloc(struct mailbox_transaction_context *_t);
  int mdbox_save_begin(struct mail_save_context *ctx, struct istream *input);
  int mdbox_save_finish(struct mail_save_context *ctx);
  void mdbox_save_cancel(struct mail_save_context *ctx);
  
  struct dbox_file *
  mdbox_save_file_get_file(struct mailbox_transaction_context *t,
  			 uint32_t seq, uoff_t *offset_r);
  
  int mdbox_transaction_save_commit_pre(struct mail_save_context *ctx);
  void mdbox_transaction_save_commit_post(struct mail_save_context *ctx,
  					struct mail_index_transaction_commit_result *result);
  void mdbox_transaction_save_rollback(struct mail_save_context *ctx);
  
  int mdbox_copy(struct mail_save_context *ctx, struct mail *mail);
  
  void mdbox_purge_alt_flag_change(struct mail *mail, bool move_to_alt);
  int mdbox_purge(struct mail_storage *storage);
  
  int mdbox_storage_create(struct mail_storage *_storage,
  			 struct mail_namespace *ns, const char **error_r);
  void mdbox_storage_destroy(struct mail_storage *_storage);
  int mdbox_mailbox_open(struct mailbox *box);
  
  void mdbox_storage_set_corrupted(struct mdbox_storage *storage);
  void mdbox_set_mailbox_corrupted(struct mailbox *box);
  void mdbox_set_file_corrupted(struct dbox_file *file);
  
  #endif
  