text: /* SPDX-License-Identifier: GPL-2.0 */
  
  #ifndef BTRFS_DISCARD_H
  #define BTRFS_DISCARD_H
  
  #include <linux/sizes.h>
  
  struct btrfs_fs_info;
  struct btrfs_discard_ctl;
  struct btrfs_block_group;
  
  /* Discard size limits */
  #define BTRFS_ASYNC_DISCARD_DEFAULT_MAX_SIZE		(SZ_64M)
  #define BTRFS_ASYNC_DISCARD_MAX_FILTER			(SZ_1M)
  #define BTRFS_ASYNC_DISCARD_MIN_FILTER			(SZ_32K)
  
  /* List operations */
  void btrfs_discard_check_filter(struct btrfs_block_group *block_group, u64 bytes);
  
  /* Work operations */
  void btrfs_discard_cancel_work(struct btrfs_discard_ctl *discard_ctl,
  			       struct btrfs_block_group *block_group);
  void btrfs_discard_queue_work(struct btrfs_discard_ctl *discard_ctl,
  			      struct btrfs_block_group *block_group);
  void btrfs_discard_schedule_work(struct btrfs_discard_ctl *discard_ctl,
  				 bool override);
  bool btrfs_run_discard_work(struct btrfs_discard_ctl *discard_ctl);
  
  /* Update operations */
  void btrfs_discard_calc_delay(struct btrfs_discard_ctl *discard_ctl);
  void btrfs_discard_update_discardable(struct btrfs_block_group *block_group,
  				      struct btrfs_free_space_ctl *ctl);
  
  /* Setup/cleanup operations */
  void btrfs_discard_punt_unused_bgs_list(struct btrfs_fs_info *fs_info);
  void btrfs_discard_resume(struct btrfs_fs_info *fs_info);
  void btrfs_discard_stop(struct btrfs_fs_info *fs_info);
  void btrfs_discard_init(struct btrfs_fs_info *fs_info);
  void btrfs_discard_cleanup(struct btrfs_fs_info *fs_info);
  
  #endif
  