linux/fs/btrfs/space-info.h

/* SPDX-License-Identifier: GPL-2.0 */

#ifndef BTRFS_SPACE_INFO_H
#define BTRFS_SPACE_INFO_H

#include <trace/events/btrfs.h>
#include <linux/spinlock.h>
#include <linux/list.h>
#include <linux/kobject.h>
#include <linux/lockdep.h>
#include <linux/wait.h>
#include <linux/rwsem.h>
#include "volumes.h"

struct btrfs_fs_info;
struct btrfs_block_group;

/*
 * Different levels for to flush space when doing space reservations.
 *
 * The higher the level, the more methods we try to reclaim space.
 */
enum btrfs_reserve_flush_enum { … };

enum btrfs_flush_state { … };

struct btrfs_space_info { … };

struct reserve_ticket { … };

static inline bool btrfs_mixed_space_info(struct btrfs_space_info *space_info)
{ … }

/*
 *
 * Declare a helper function to detect underflow of various space info members
 */
#define DECLARE_SPACE_INFO_UPDATE(name, trace_name) …

DECLARE_SPACE_INFO_UPDATE(bytes_may_use, "space_info");
DECLARE_SPACE_INFO_UPDATE(bytes_pinned, "pinned");
DECLARE_SPACE_INFO_UPDATE(bytes_zone_unusable, "zone_unusable");

int btrfs_init_space_info(struct btrfs_fs_info *fs_info);
void btrfs_add_bg_to_space_info(struct btrfs_fs_info *info,
				struct btrfs_block_group *block_group);
void btrfs_update_space_info_chunk_size(struct btrfs_space_info *space_info,
					u64 chunk_size);
struct btrfs_space_info *btrfs_find_space_info(struct btrfs_fs_info *info,
					       u64 flags);
u64 __pure btrfs_space_info_used(struct btrfs_space_info *s_info,
			  bool may_use_included);
void btrfs_clear_space_info_full(struct btrfs_fs_info *info);
void btrfs_dump_space_info(struct btrfs_fs_info *fs_info,
			   struct btrfs_space_info *info, u64 bytes,
			   int dump_block_groups);
int btrfs_reserve_metadata_bytes(struct btrfs_fs_info *fs_info,
				 struct btrfs_space_info *space_info,
				 u64 orig_bytes,
				 enum btrfs_reserve_flush_enum flush);
void btrfs_try_granting_tickets(struct btrfs_fs_info *fs_info,
				struct btrfs_space_info *space_info);
int btrfs_can_overcommit(struct btrfs_fs_info *fs_info,
			 struct btrfs_space_info *space_info, u64 bytes,
			 enum btrfs_reserve_flush_enum flush);

static inline void btrfs_space_info_free_bytes_may_use(
				struct btrfs_fs_info *fs_info,
				struct btrfs_space_info *space_info,
				u64 num_bytes)
{ … }
int btrfs_reserve_data_bytes(struct btrfs_fs_info *fs_info, u64 bytes,
			     enum btrfs_reserve_flush_enum flush);
void btrfs_dump_space_info_for_trans_abort(struct btrfs_fs_info *fs_info);
void btrfs_init_async_reclaim_work(struct btrfs_fs_info *fs_info);
u64 btrfs_account_ro_block_groups_free_space(struct btrfs_space_info *sinfo);

void btrfs_space_info_update_reclaimable(struct btrfs_space_info *space_info, s64 bytes);
void btrfs_set_periodic_reclaim_ready(struct btrfs_space_info *space_info, bool ready);
bool btrfs_should_periodic_reclaim(struct btrfs_space_info *space_info);
int btrfs_calc_reclaim_threshold(struct btrfs_space_info *space_info);
int btrfs_reclaim_sweep(struct btrfs_fs_info *fs_info);

#endif /* BTRFS_SPACE_INFO_H */