delayed-ref.h | Explore in Territory

/* SPDX-License-Identifier: GPL-2.0 */
/*
 * Copyright (C) 2008 Oracle.  All rights reserved.
 */

#ifndef BTRFS_DELAYED_REF_H
#define BTRFS_DELAYED_REF_H

#include <linux/types.h>
#include <linux/refcount.h>
#include <linux/list.h>
#include <linux/rbtree.h>
#include <linux/mutex.h>
#include <linux/spinlock.h>
#include <linux/slab.h>
#include <uapi/linux/btrfs_tree.h>

struct btrfs_trans_handle;
struct btrfs_fs_info;

/* these are the possible values of struct btrfs_delayed_ref_node->action */
enum btrfs_delayed_ref_action { … } __packed;

struct btrfs_data_ref { … };

struct btrfs_tree_ref { … };

struct btrfs_delayed_ref_node { … };

struct btrfs_delayed_extent_op { … };

/*
 * the head refs are used to hold a lock on a given extent, which allows us
 * to make sure that only one process is running the delayed refs
 * at a time for a single extent.  They also store the sum of all the
 * reference count modifications we've queued up.
 */
struct btrfs_delayed_ref_head { … };

enum btrfs_delayed_ref_flags { … };

struct btrfs_delayed_ref_root { … };

enum btrfs_ref_type { … } __packed;

struct btrfs_ref { … };

extern struct kmem_cache *btrfs_delayed_ref_head_cachep;
extern struct kmem_cache *btrfs_delayed_ref_node_cachep;
extern struct kmem_cache *btrfs_delayed_extent_op_cachep;

int __init btrfs_delayed_ref_init(void);
void __cold btrfs_delayed_ref_exit(void);

static inline u64 btrfs_calc_delayed_ref_bytes(const struct btrfs_fs_info *fs_info,
					       int num_delayed_refs)
{ … }

static inline u64 btrfs_calc_delayed_ref_csum_bytes(const struct btrfs_fs_info *fs_info,
						    int num_csum_items)
{ … }

void btrfs_init_tree_ref(struct btrfs_ref *generic_ref, int level, u64 mod_root,
			 bool skip_qgroup);
void btrfs_init_data_ref(struct btrfs_ref *generic_ref, u64 ino, u64 offset,
			 u64 mod_root, bool skip_qgroup);

static inline struct btrfs_delayed_extent_op *
btrfs_alloc_delayed_extent_op(void)
{ … }

static inline void
btrfs_free_delayed_extent_op(struct btrfs_delayed_extent_op *op)
{ … }

void btrfs_put_delayed_ref(struct btrfs_delayed_ref_node *ref);

static inline u64 btrfs_ref_head_to_space_flags(
				struct btrfs_delayed_ref_head *head_ref)
{ … }

static inline void btrfs_put_delayed_ref_head(struct btrfs_delayed_ref_head *head)
{ … }

int btrfs_add_delayed_tree_ref(struct btrfs_trans_handle *trans,
			       struct btrfs_ref *generic_ref,
			       struct btrfs_delayed_extent_op *extent_op);
int btrfs_add_delayed_data_ref(struct btrfs_trans_handle *trans,
			       struct btrfs_ref *generic_ref,
			       u64 reserved);
int btrfs_add_delayed_extent_op(struct btrfs_trans_handle *trans,
				u64 bytenr, u64 num_bytes, u8 level,
				struct btrfs_delayed_extent_op *extent_op);
void btrfs_merge_delayed_refs(struct btrfs_fs_info *fs_info,
			      struct btrfs_delayed_ref_root *delayed_refs,
			      struct btrfs_delayed_ref_head *head);

struct btrfs_delayed_ref_head *
btrfs_find_delayed_ref_head(struct btrfs_delayed_ref_root *delayed_refs,
			    u64 bytenr);
int btrfs_delayed_ref_lock(struct btrfs_delayed_ref_root *delayed_refs,
			   struct btrfs_delayed_ref_head *head);
static inline void btrfs_delayed_ref_unlock(struct btrfs_delayed_ref_head *head)
{ … }
void btrfs_delete_ref_head(struct btrfs_delayed_ref_root *delayed_refs,
			   struct btrfs_delayed_ref_head *head);

struct btrfs_delayed_ref_head *btrfs_select_ref_head(
		struct btrfs_delayed_ref_root *delayed_refs);

int btrfs_check_delayed_seq(struct btrfs_fs_info *fs_info, u64 seq);

void btrfs_delayed_refs_rsv_release(struct btrfs_fs_info *fs_info, int nr_refs, int nr_csums);
void btrfs_update_delayed_refs_rsv(struct btrfs_trans_handle *trans);
void btrfs_inc_delayed_refs_rsv_bg_inserts(struct btrfs_fs_info *fs_info);
void btrfs_dec_delayed_refs_rsv_bg_inserts(struct btrfs_fs_info *fs_info);
void btrfs_inc_delayed_refs_rsv_bg_updates(struct btrfs_fs_info *fs_info);
void btrfs_dec_delayed_refs_rsv_bg_updates(struct btrfs_fs_info *fs_info);
int btrfs_delayed_refs_rsv_refill(struct btrfs_fs_info *fs_info,
				  enum btrfs_reserve_flush_enum flush);
bool btrfs_check_space_for_delayed_refs(struct btrfs_fs_info *fs_info);

static inline u64 btrfs_delayed_ref_owner(struct btrfs_delayed_ref_node *node)
{ … }

static inline u64 btrfs_delayed_ref_offset(struct btrfs_delayed_ref_node *node)
{ … }

static inline u8 btrfs_ref_type(struct btrfs_ref *ref)
{ … }

#endif
linux/fs/btrfs/delayed-ref.h
