[thirdparty/kernel/stable.git] / fs / btrfs / delayed-ref.h

/* 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/refcount.h>

/* these are the possible values of struct btrfs_delayed_ref_node->action */
#define BTRFS_ADD_DELAYED_REF    1 /* add one backref to the tree */
#define BTRFS_DROP_DELAYED_REF   2 /* delete one backref from the tree */
#define BTRFS_ADD_DELAYED_EXTENT 3 /* record a full extent allocation */
#define BTRFS_UPDATE_DELAYED_HEAD 4 /* not changing ref count on head ref */

struct btrfs_delayed_ref_node {
	struct rb_node ref_node;
	/*
	 * If action is BTRFS_ADD_DELAYED_REF, also link this node to
	 * ref_head->ref_add_list, then we do not need to iterate the
	 * whole ref_head->ref_list to find BTRFS_ADD_DELAYED_REF nodes.
	 */
	struct list_head add_list;

	/* the starting bytenr of the extent */
	u64 bytenr;

	/* the size of the extent */
	u64 num_bytes;

	/* seq number to keep track of insertion order */
	u64 seq;

	/* ref count on this data structure */
	refcount_t refs;

	/*
	 * how many refs is this entry adding or deleting.  For
	 * head refs, this may be a negative number because it is keeping
	 * track of the total mods done to the reference count.
	 * For individual refs, this will always be a positive number
	 *
	 * It may be more than one, since it is possible for a single
	 * parent to have more than one ref on an extent
	 */
	int ref_mod;

	unsigned int action:8;
	unsigned int type:8;
};

struct btrfs_delayed_extent_op {
	struct btrfs_disk_key key;
	u8 level;
	bool update_key;
	bool update_flags;
	u64 flags_to_set;
};

/*
 * 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 {
	u64 bytenr;
	u64 num_bytes;
	/*
	 * For insertion into struct btrfs_delayed_ref_root::href_root.
	 * Keep it in the same cache line as 'bytenr' for more efficient
	 * searches in the rbtree.
	 */
	struct rb_node href_node;
	/*
	 * the mutex is held while running the refs, and it is also
	 * held when checking the sum of reference modifications.
	 */
	struct mutex mutex;

	refcount_t refs;

	/* Protects 'ref_tree' and 'ref_add_list'. */
	spinlock_t lock;
	struct rb_root_cached ref_tree;
	/* accumulate add BTRFS_ADD_DELAYED_REF nodes to this ref_add_list. */
	struct list_head ref_add_list;

	struct btrfs_delayed_extent_op *extent_op;

	/*
	 * This is used to track the final ref_mod from all the refs associated
	 * with this head ref, this is not adjusted as delayed refs are run,
	 * this is meant to track if we need to do the csum accounting or not.
	 */
	int total_ref_mod;

	/*
	 * This is the current outstanding mod references for this bytenr.  This
	 * is used with lookup_extent_info to get an accurate reference count
	 * for a bytenr, so it is adjusted as delayed refs are run so that any
	 * on disk reference count + ref_mod is accurate.
	 */
	int ref_mod;

	/*
	 * when a new extent is allocated, it is just reserved in memory
	 * The actual extent isn't inserted into the extent allocation tree
	 * until the delayed ref is processed.  must_insert_reserved is
	 * used to flag a delayed ref so the accounting can be updated
	 * when a full insert is done.
	 *
	 * It is possible the extent will be freed before it is ever
	 * inserted into the extent allocation tree.  In this case
	 * we need to update the in ram accounting to properly reflect
	 * the free has happened.
	 */
	bool must_insert_reserved;
	bool is_data;
	bool is_system;
	bool processing;
};

struct btrfs_delayed_tree_ref {
	struct btrfs_delayed_ref_node node;
	u64 root;
	u64 parent;
	int level;
};

struct btrfs_delayed_data_ref {
	struct btrfs_delayed_ref_node node;
	u64 root;
	u64 parent;
	u64 objectid;
	u64 offset;
};

enum btrfs_delayed_ref_flags {
	/* Indicate that we are flushing delayed refs for the commit */
	BTRFS_DELAYED_REFS_FLUSHING,
};

struct btrfs_delayed_ref_root {
	/* head ref rbtree */
	struct rb_root_cached href_root;

	/* dirty extent records */
	struct rb_root dirty_extent_root;

	/* this spin lock protects the rbtree and the entries inside */
	spinlock_t lock;

	/* how many delayed ref updates we've queued, used by the
	 * throttling code
	 */
	atomic_t num_entries;

	/* total number of head nodes in tree */
	unsigned long num_heads;

	/* total number of head nodes ready for processing */
	unsigned long num_heads_ready;

	u64 pending_csums;

	unsigned long flags;

	u64 run_delayed_start;

	/*
	 * To make qgroup to skip given root.
	 * This is for snapshot, as btrfs_qgroup_inherit() will manually
	 * modify counters for snapshot and its source, so we should skip
	 * the snapshot in new_root/old_roots or it will get calculated twice
	 */
	u64 qgroup_to_skip;
};

enum btrfs_ref_type {
	BTRFS_REF_NOT_SET,
	BTRFS_REF_DATA,
	BTRFS_REF_METADATA,
	BTRFS_REF_LAST,
};

struct btrfs_data_ref {
	/* For EXTENT_DATA_REF */

	/* Original root this data extent belongs to */
	u64 owning_root;

	/* Inode which refers to this data extent */
	u64 ino;

	/*
	 * file_offset - extent_offset
	 *
	 * file_offset is the key.offset of the EXTENT_DATA key.
	 * extent_offset is btrfs_file_extent_offset() of the EXTENT_DATA data.
	 */
	u64 offset;
};

struct btrfs_tree_ref {
	/*
	 * Level of this tree block
	 *
	 * Shared for skinny (TREE_BLOCK_REF) and normal tree ref.
	 */
	int level;

	/*
	 * Root which owns this tree block.
	 *
	 * For TREE_BLOCK_REF (skinny metadata, either inline or keyed)
	 */
	u64 owning_root;

	/* For non-skinny metadata, no special member needed */
};

struct btrfs_ref {
	enum btrfs_ref_type type;
	int action;

	/*
	 * Whether this extent should go through qgroup record.
	 *
	 * Normally false, but for certain cases like delayed subtree scan,
	 * setting this flag can hugely reduce qgroup overhead.
	 */
	bool skip_qgroup;

#ifdef CONFIG_BTRFS_FS_REF_VERIFY
	/* Through which root is this modification. */
	u64 real_root;
#endif
	u64 bytenr;
	u64 len;

	/* Bytenr of the parent tree block */
	u64 parent;
	union {
		struct btrfs_data_ref data_ref;
		struct btrfs_tree_ref tree_ref;
	};
};

extern struct kmem_cache *btrfs_delayed_ref_head_cachep;
extern struct kmem_cache *btrfs_delayed_tree_ref_cachep;
extern struct kmem_cache *btrfs_delayed_data_ref_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)
{
	u64 num_bytes;

	num_bytes = btrfs_calc_insert_metadata_size(fs_info, num_delayed_refs);

	/*
	 * We have to check the mount option here because we could be enabling
	 * the free space tree for the first time and don't have the compat_ro
	 * option set yet.
	 *
	 * We need extra reservations if we have the free space tree because
	 * we'll have to modify that tree as well.
	 */
	if (btrfs_test_opt(fs_info, FREE_SPACE_TREE))
		num_bytes *= 2;

	return num_bytes;
}

static inline void btrfs_init_generic_ref(struct btrfs_ref *generic_ref,
				int action, u64 bytenr, u64 len, u64 parent)
{
	generic_ref->action = action;
	generic_ref->bytenr = bytenr;
	generic_ref->len = len;
	generic_ref->parent = parent;
}

static inline void btrfs_init_tree_ref(struct btrfs_ref *generic_ref,
				int level, u64 root, u64 mod_root, bool skip_qgroup)
{
#ifdef CONFIG_BTRFS_FS_REF_VERIFY
	/* If @real_root not set, use @root as fallback */
	generic_ref->real_root = mod_root ?: root;
#endif
	generic_ref->tree_ref.level = level;
	generic_ref->tree_ref.owning_root = root;
	generic_ref->type = BTRFS_REF_METADATA;
	if (skip_qgroup || !(is_fstree(root) &&
			     (!mod_root || is_fstree(mod_root))))
		generic_ref->skip_qgroup = true;
	else
		generic_ref->skip_qgroup = false;

}

static inline void btrfs_init_data_ref(struct btrfs_ref *generic_ref,
				u64 ref_root, u64 ino, u64 offset, u64 mod_root,
				bool skip_qgroup)
{
#ifdef CONFIG_BTRFS_FS_REF_VERIFY
	/* If @real_root not set, use @root as fallback */
	generic_ref->real_root = mod_root ?: ref_root;
#endif
	generic_ref->data_ref.owning_root = ref_root;
	generic_ref->data_ref.ino = ino;
	generic_ref->data_ref.offset = offset;
	generic_ref->type = BTRFS_REF_DATA;
	if (skip_qgroup || !(is_fstree(ref_root) &&
			     (!mod_root || is_fstree(mod_root))))
		generic_ref->skip_qgroup = true;
	else
		generic_ref->skip_qgroup = false;
}

static inline struct btrfs_delayed_extent_op *
btrfs_alloc_delayed_extent_op(void)
{
	return kmem_cache_alloc(btrfs_delayed_extent_op_cachep, GFP_NOFS);
}

static inline void
btrfs_free_delayed_extent_op(struct btrfs_delayed_extent_op *op)
{
	if (op)
		kmem_cache_free(btrfs_delayed_extent_op_cachep, op);
}

static inline void btrfs_put_delayed_ref(struct btrfs_delayed_ref_node *ref)
{
	WARN_ON(refcount_read(&ref->refs) == 0);
	if (refcount_dec_and_test(&ref->refs)) {
		WARN_ON(!RB_EMPTY_NODE(&ref->ref_node));
		switch (ref->type) {
		case BTRFS_TREE_BLOCK_REF_KEY:
		case BTRFS_SHARED_BLOCK_REF_KEY:
			kmem_cache_free(btrfs_delayed_tree_ref_cachep, ref);
			break;
		case BTRFS_EXTENT_DATA_REF_KEY:
		case BTRFS_SHARED_DATA_REF_KEY:
			kmem_cache_free(btrfs_delayed_data_ref_cachep, ref);
			break;
		default:
			BUG();
		}
	}
}

static inline u64 btrfs_ref_head_to_space_flags(
				struct btrfs_delayed_ref_head *head_ref)
{
	if (head_ref->is_data)
		return BTRFS_BLOCK_GROUP_DATA;
	else if (head_ref->is_system)
		return BTRFS_BLOCK_GROUP_SYSTEM;
	return BTRFS_BLOCK_GROUP_METADATA;
}

static inline void btrfs_put_delayed_ref_head(struct btrfs_delayed_ref_head *head)
{
	if (refcount_dec_and_test(&head->refs))
		kmem_cache_free(btrfs_delayed_ref_head_cachep, 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,
				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)
{
	mutex_unlock(&head->mutex);
}
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);
void btrfs_update_delayed_refs_rsv(struct btrfs_trans_handle *trans);
int btrfs_delayed_refs_rsv_refill(struct btrfs_fs_info *fs_info,
				  enum btrfs_reserve_flush_enum flush);
void btrfs_migrate_to_delayed_refs_rsv(struct btrfs_fs_info *fs_info,
				       u64 num_bytes);
bool btrfs_check_space_for_delayed_refs(struct btrfs_fs_info *fs_info);

/*
 * helper functions to cast a node into its container
 */
static inline struct btrfs_delayed_tree_ref *
btrfs_delayed_node_to_tree_ref(struct btrfs_delayed_ref_node *node)
{
	return container_of(node, struct btrfs_delayed_tree_ref, node);
}

static inline struct btrfs_delayed_data_ref *
btrfs_delayed_node_to_data_ref(struct btrfs_delayed_ref_node *node)
{
	return container_of(node, struct btrfs_delayed_data_ref, node);
}

#endif
Commit	Line	Data
9888c340	1	/* SPDX-License-Identifier: GPL-2.0 */
56bec294 CM	2	/*
56bec294 CM	3	* Copyright (C) 2008 Oracle. All rights reserved.
56bec294	4	*/
9888c340 DS	5
	6	#ifndef BTRFS_DELAYED_REF_H
	7	#define BTRFS_DELAYED_REF_H
56bec294	8
6df8cdf5 ER	9	#include <linux/refcount.h>
6df8cdf5 ER	10
44a075bd	11	/* these are the possible values of struct btrfs_delayed_ref_node->action */
56bec294 CM	12	#define BTRFS_ADD_DELAYED_REF 1 /* add one backref to the tree */
	13	#define BTRFS_DROP_DELAYED_REF 2 /* delete one backref from the tree */
	14	#define BTRFS_ADD_DELAYED_EXTENT 3 /* record a full extent allocation */
1a81af4d	15	#define BTRFS_UPDATE_DELAYED_HEAD 4 /* not changing ref count on head ref */
56bec294 CM	16
56bec294 CM	17	struct btrfs_delayed_ref_node {
0e0adbcf	18	struct rb_node ref_node;
1d57ee94 WX	19	/*
	20	* If action is BTRFS_ADD_DELAYED_REF, also link this node to
	21	* ref_head->ref_add_list, then we do not need to iterate the
	22	* whole ref_head->ref_list to find BTRFS_ADD_DELAYED_REF nodes.
	23	*/
	24	struct list_head add_list;
c6fc2454	25
56bec294 CM	26	/* the starting bytenr of the extent */
	27	u64 bytenr;
	28
56bec294 CM	29	/* the size of the extent */
	30	u64 num_bytes;
	31
00f04b88 AJ	32	/* seq number to keep track of insertion order */
	33	u64 seq;
	34
56bec294	35	/* ref count on this data structure */
6df8cdf5	36	refcount_t refs;
56bec294 CM	37
	38	/*
	39	* how many refs is this entry adding or deleting. For
	40	* head refs, this may be a negative number because it is keeping
	41	* track of the total mods done to the reference count.
	42	* For individual refs, this will always be a positive number
	43	*
	44	* It may be more than one, since it is possible for a single
	45	* parent to have more than one ref on an extent
	46	*/
	47	int ref_mod;
	48
5d4f98a2 YZ	49	unsigned int action:8;
5d4f98a2 YZ	50	unsigned int type:8;
56bec294 CM	51	};
56bec294 CM	52
5d4f98a2 YZ	53	struct btrfs_delayed_extent_op {
5d4f98a2 YZ	54	struct btrfs_disk_key key;
35b3ad50 DS	55	u8 level;
	56	bool update_key;
	57	bool update_flags;
5d4f98a2	58	u64 flags_to_set;
5d4f98a2 YZ	59	};
5d4f98a2 YZ	60
56bec294 CM	61	/*
	62	* the head refs are used to hold a lock on a given extent, which allows us
	63	* to make sure that only one process is running the delayed refs
	64	* at a time for a single extent. They also store the sum of all the
	65	* reference count modifications we've queued up.
	66	*/
	67	struct btrfs_delayed_ref_head {
d278850e JB	68	u64 bytenr;
d278850e JB	69	u64 num_bytes;
315dd5cc FM	70	/*
	71	* For insertion into struct btrfs_delayed_ref_root::href_root.
	72	* Keep it in the same cache line as 'bytenr' for more efficient
	73	* searches in the rbtree.
	74	*/
	75	struct rb_node href_node;
56bec294 CM	76	/*
	77	* the mutex is held while running the refs, and it is also
	78	* held when checking the sum of reference modifications.
	79	*/
	80	struct mutex mutex;
	81
315dd5cc FM	82	refcount_t refs;
	83
	84	/* Protects 'ref_tree' and 'ref_add_list'. */
d7df2c79	85	spinlock_t lock;
e3d03965	86	struct rb_root_cached ref_tree;
1d57ee94 WX	87	/* accumulate add BTRFS_ADD_DELAYED_REF nodes to this ref_add_list. */
1d57ee94 WX	88	struct list_head ref_add_list;
c3e69d58	89
5d4f98a2	90	struct btrfs_delayed_extent_op *extent_op;
1262133b JB	91
	92	/*
	93	* This is used to track the final ref_mod from all the refs associated
	94	* with this head ref, this is not adjusted as delayed refs are run,
	95	* this is meant to track if we need to do the csum accounting or not.
	96	*/
	97	int total_ref_mod;
	98
d278850e JB	99	/*
	100	* This is the current outstanding mod references for this bytenr. This
	101	* is used with lookup_extent_info to get an accurate reference count
	102	* for a bytenr, so it is adjusted as delayed refs are run so that any
	103	* on disk reference count + ref_mod is accurate.
	104	*/
	105	int ref_mod;
	106
56bec294 CM	107	/*
	108	* when a new extent is allocated, it is just reserved in memory
	109	* The actual extent isn't inserted into the extent allocation tree
	110	* until the delayed ref is processed. must_insert_reserved is
	111	* used to flag a delayed ref so the accounting can be updated
	112	* when a full insert is done.
	113	*
	114	* It is possible the extent will be freed before it is ever
	115	* inserted into the extent allocation tree. In this case
	116	* we need to update the in ram accounting to properly reflect
	117	* the free has happened.
	118	*/
61c681fe FM	119	bool must_insert_reserved;
	120	bool is_data;
	121	bool is_system;
	122	bool processing;
56bec294 CM	123	};
56bec294 CM	124
5d4f98a2	125	struct btrfs_delayed_tree_ref {
56bec294	126	struct btrfs_delayed_ref_node node;
eebe063b AJ	127	u64 root;
eebe063b AJ	128	u64 parent;
5d4f98a2 YZ	129	int level;
5d4f98a2 YZ	130	};
56bec294	131
5d4f98a2 YZ	132	struct btrfs_delayed_data_ref {
5d4f98a2 YZ	133	struct btrfs_delayed_ref_node node;
eebe063b AJ	134	u64 root;
eebe063b AJ	135	u64 parent;
5d4f98a2 YZ	136	u64 objectid;
5d4f98a2 YZ	137	u64 offset;
56bec294 CM	138	};
56bec294 CM	139
e19eb11f JB	140	enum btrfs_delayed_ref_flags {
	141	/* Indicate that we are flushing delayed refs for the commit */
	142	BTRFS_DELAYED_REFS_FLUSHING,
	143	};
	144
56bec294	145	struct btrfs_delayed_ref_root {
c46effa6	146	/* head ref rbtree */
5c9d028b	147	struct rb_root_cached href_root;
c46effa6	148
3368d001 QW	149	/* dirty extent records */
	150	struct rb_root dirty_extent_root;
	151
56bec294 CM	152	/* this spin lock protects the rbtree and the entries inside */
	153	spinlock_t lock;
	154
	155	/* how many delayed ref updates we've queued, used by the
	156	* throttling code
	157	*/
d7df2c79	158	atomic_t num_entries;
56bec294	159
c3e69d58 CM	160	/* total number of head nodes in tree */
	161	unsigned long num_heads;
	162
	163	/* total number of head nodes ready for processing */
	164	unsigned long num_heads_ready;
	165
1262133b JB	166	u64 pending_csums;
1262133b JB	167
e19eb11f	168	unsigned long flags;
c3e69d58 CM	169
c3e69d58 CM	170	u64 run_delayed_start;
9086db86 QW	171
	172	/*
	173	* To make qgroup to skip given root.
01327610	174	* This is for snapshot, as btrfs_qgroup_inherit() will manually
9086db86 QW	175	* modify counters for snapshot and its source, so we should skip
	176	* the snapshot in new_root/old_roots or it will get calculated twice
	177	*/
	178	u64 qgroup_to_skip;
56bec294 CM	179	};
56bec294 CM	180
b28b1f0c QW	181	enum btrfs_ref_type {
	182	BTRFS_REF_NOT_SET,
	183	BTRFS_REF_DATA,
	184	BTRFS_REF_METADATA,
	185	BTRFS_REF_LAST,
	186	};
	187
	188	struct btrfs_data_ref {
	189	/* For EXTENT_DATA_REF */
	190
113479d5 NB	191	/* Original root this data extent belongs to */
113479d5 NB	192	u64 owning_root;
b28b1f0c QW	193
	194	/* Inode which refers to this data extent */
	195	u64 ino;
	196
	197	/*
	198	* file_offset - extent_offset
	199	*
	200	* file_offset is the key.offset of the EXTENT_DATA key.
	201	* extent_offset is btrfs_file_extent_offset() of the EXTENT_DATA data.
	202	*/
	203	u64 offset;
	204	};
	205
	206	struct btrfs_tree_ref {
	207	/*
	208	* Level of this tree block
	209	*
	210	* Shared for skinny (TREE_BLOCK_REF) and normal tree ref.
	211	*/
	212	int level;
	213
	214	/*
113479d5	215	* Root which owns this tree block.
b28b1f0c QW	216	*
	217	* For TREE_BLOCK_REF (skinny metadata, either inline or keyed)
	218	*/
113479d5	219	u64 owning_root;
b28b1f0c QW	220
	221	/* For non-skinny metadata, no special member needed */
	222	};
	223
	224	struct btrfs_ref {
	225	enum btrfs_ref_type type;
	226	int action;
	227
	228	/*
	229	* Whether this extent should go through qgroup record.
	230	*
	231	* Normally false, but for certain cases like delayed subtree scan,
	232	* setting this flag can hugely reduce qgroup overhead.
	233	*/
	234	bool skip_qgroup;
	235
eed2037f NB	236	#ifdef CONFIG_BTRFS_FS_REF_VERIFY
eed2037f NB	237	/* Through which root is this modification. */
b28b1f0c	238	u64 real_root;
eed2037f	239	#endif
b28b1f0c QW	240	u64 bytenr;
	241	u64 len;
	242
	243	/* Bytenr of the parent tree block */
	244	u64 parent;
	245	union {
	246	struct btrfs_data_ref data_ref;
	247	struct btrfs_tree_ref tree_ref;
	248	};
	249	};
	250
78a6184a MX	251	extern struct kmem_cache *btrfs_delayed_ref_head_cachep;
	252	extern struct kmem_cache *btrfs_delayed_tree_ref_cachep;
	253	extern struct kmem_cache *btrfs_delayed_data_ref_cachep;
	254	extern struct kmem_cache *btrfs_delayed_extent_op_cachep;
	255
f5c29bd9	256	int __init btrfs_delayed_ref_init(void);
e67c718b	257	void __cold btrfs_delayed_ref_exit(void);
78a6184a	258
0e55a545 FM	259	static inline u64 btrfs_calc_delayed_ref_bytes(const struct btrfs_fs_info *fs_info,
	260	int num_delayed_refs)
	261	{
	262	u64 num_bytes;
	263
	264	num_bytes = btrfs_calc_insert_metadata_size(fs_info, num_delayed_refs);
	265
	266	/*
	267	* We have to check the mount option here because we could be enabling
	268	* the free space tree for the first time and don't have the compat_ro
	269	* option set yet.
	270	*
	271	* We need extra reservations if we have the free space tree because
	272	* we'll have to modify that tree as well.
	273	*/
	274	if (btrfs_test_opt(fs_info, FREE_SPACE_TREE))
	275	num_bytes *= 2;
	276
	277	return num_bytes;
	278	}
	279
b28b1f0c QW	280	static inline void btrfs_init_generic_ref(struct btrfs_ref *generic_ref,
	281	int action, u64 bytenr, u64 len, u64 parent)
	282	{
	283	generic_ref->action = action;
	284	generic_ref->bytenr = bytenr;
	285	generic_ref->len = len;
	286	generic_ref->parent = parent;
	287	}
	288
	289	static inline void btrfs_init_tree_ref(struct btrfs_ref *generic_ref,
f42c5da6	290	int level, u64 root, u64 mod_root, bool skip_qgroup)
b28b1f0c	291	{
eed2037f	292	#ifdef CONFIG_BTRFS_FS_REF_VERIFY
b28b1f0c	293	/* If @real_root not set, use @root as fallback */
eed2037f NB	294	generic_ref->real_root = mod_root ?: root;
eed2037f NB	295	#endif
b28b1f0c	296	generic_ref->tree_ref.level = level;
113479d5	297	generic_ref->tree_ref.owning_root = root;
b28b1f0c	298	generic_ref->type = BTRFS_REF_METADATA;
681145d4 NB	299	if (skip_qgroup \|\| !(is_fstree(root) &&
	300	(!mod_root \|\| is_fstree(mod_root))))
	301	generic_ref->skip_qgroup = true;
	302	else
	303	generic_ref->skip_qgroup = false;
	304
b28b1f0c QW	305	}
	306
	307	static inline void btrfs_init_data_ref(struct btrfs_ref *generic_ref,
f42c5da6 NB	308	u64 ref_root, u64 ino, u64 offset, u64 mod_root,
f42c5da6 NB	309	bool skip_qgroup)
b28b1f0c	310	{
eed2037f	311	#ifdef CONFIG_BTRFS_FS_REF_VERIFY
b28b1f0c	312	/* If @real_root not set, use @root as fallback */
eed2037f NB	313	generic_ref->real_root = mod_root ?: ref_root;
eed2037f NB	314	#endif
113479d5	315	generic_ref->data_ref.owning_root = ref_root;
b28b1f0c QW	316	generic_ref->data_ref.ino = ino;
	317	generic_ref->data_ref.offset = offset;
	318	generic_ref->type = BTRFS_REF_DATA;
681145d4 NB	319	if (skip_qgroup \|\| !(is_fstree(ref_root) &&
	320	(!mod_root \|\| is_fstree(mod_root))))
	321	generic_ref->skip_qgroup = true;
	322	else
	323	generic_ref->skip_qgroup = false;
b28b1f0c QW	324	}
b28b1f0c QW	325
78a6184a MX	326	static inline struct btrfs_delayed_extent_op *
	327	btrfs_alloc_delayed_extent_op(void)
	328	{
	329	return kmem_cache_alloc(btrfs_delayed_extent_op_cachep, GFP_NOFS);
	330	}
	331
	332	static inline void
	333	btrfs_free_delayed_extent_op(struct btrfs_delayed_extent_op *op)
	334	{
	335	if (op)
	336	kmem_cache_free(btrfs_delayed_extent_op_cachep, op);
	337	}
	338
56bec294 CM	339	static inline void btrfs_put_delayed_ref(struct btrfs_delayed_ref_node *ref)
56bec294 CM	340	{
6df8cdf5 ER	341	WARN_ON(refcount_read(&ref->refs) == 0);
6df8cdf5 ER	342	if (refcount_dec_and_test(&ref->refs)) {
4d34ad34	343	WARN_ON(!RB_EMPTY_NODE(&ref->ref_node));
78a6184a MX	344	switch (ref->type) {
	345	case BTRFS_TREE_BLOCK_REF_KEY:
	346	case BTRFS_SHARED_BLOCK_REF_KEY:
	347	kmem_cache_free(btrfs_delayed_tree_ref_cachep, ref);
	348	break;
	349	case BTRFS_EXTENT_DATA_REF_KEY:
	350	case BTRFS_SHARED_DATA_REF_KEY:
	351	kmem_cache_free(btrfs_delayed_data_ref_cachep, ref);
	352	break;
78a6184a MX	353	default:
	354	BUG();
	355	}
56bec294 CM	356	}
	357	}
	358
2187374f JB	359	static inline u64 btrfs_ref_head_to_space_flags(
	360	struct btrfs_delayed_ref_head *head_ref)
	361	{
	362	if (head_ref->is_data)
	363	return BTRFS_BLOCK_GROUP_DATA;
	364	else if (head_ref->is_system)
	365	return BTRFS_BLOCK_GROUP_SYSTEM;
	366	return BTRFS_BLOCK_GROUP_METADATA;
	367	}
	368
d278850e JB	369	static inline void btrfs_put_delayed_ref_head(struct btrfs_delayed_ref_head *head)
	370	{
	371	if (refcount_dec_and_test(&head->refs))
	372	kmem_cache_free(btrfs_delayed_ref_head_cachep, head);
	373	}
	374
44e1c47d	375	int btrfs_add_delayed_tree_ref(struct btrfs_trans_handle *trans,
ed4f255b	376	struct btrfs_ref *generic_ref,
2187374f	377	struct btrfs_delayed_extent_op *extent_op);
88a979c6	378	int btrfs_add_delayed_data_ref(struct btrfs_trans_handle *trans,
76675593	379	struct btrfs_ref *generic_ref,
2187374f	380	u64 reserved);
c6e340bc	381	int btrfs_add_delayed_extent_op(struct btrfs_trans_handle *trans,
5d4f98a2 YZ	382	u64 bytenr, u64 num_bytes,
5d4f98a2 YZ	383	struct btrfs_delayed_extent_op *extent_op);
0c555c97	384	void btrfs_merge_delayed_refs(struct btrfs_fs_info *fs_info,
ae1e206b JB	385	struct btrfs_delayed_ref_root *delayed_refs,
ae1e206b JB	386	struct btrfs_delayed_ref_head *head);
56bec294	387
1887be66	388	struct btrfs_delayed_ref_head *
f72ad18e LB	389	btrfs_find_delayed_ref_head(struct btrfs_delayed_ref_root *delayed_refs,
f72ad18e LB	390	u64 bytenr);
9e920a6f	391	int btrfs_delayed_ref_lock(struct btrfs_delayed_ref_root *delayed_refs,
c3e69d58	392	struct btrfs_delayed_ref_head *head);
093486c4 MX	393	static inline void btrfs_delayed_ref_unlock(struct btrfs_delayed_ref_head *head)
	394	{
	395	mutex_unlock(&head->mutex);
	396	}
d7baffda JB	397	void btrfs_delete_ref_head(struct btrfs_delayed_ref_root *delayed_refs,
d7baffda JB	398	struct btrfs_delayed_ref_head *head);
d7df2c79	399
5637c74b LF	400	struct btrfs_delayed_ref_head *btrfs_select_ref_head(
5637c74b LF	401	struct btrfs_delayed_ref_root *delayed_refs);
00f04b88	402
41d0bd3b	403	int btrfs_check_delayed_seq(struct btrfs_fs_info *fs_info, u64 seq);
00f04b88	404
6ef03deb JB	405	void btrfs_delayed_refs_rsv_release(struct btrfs_fs_info *fs_info, int nr);
	406	void btrfs_update_delayed_refs_rsv(struct btrfs_trans_handle *trans);
	407	int btrfs_delayed_refs_rsv_refill(struct btrfs_fs_info *fs_info,
	408	enum btrfs_reserve_flush_enum flush);
	409	void btrfs_migrate_to_delayed_refs_rsv(struct btrfs_fs_info *fs_info,
6ef03deb	410	u64 num_bytes);
6ef03deb JB	411	bool btrfs_check_space_for_delayed_refs(struct btrfs_fs_info *fs_info);
6ef03deb JB	412
56bec294 CM	413	/*
	414	* helper functions to cast a node into its container
	415	*/
5d4f98a2 YZ	416	static inline struct btrfs_delayed_tree_ref *
5d4f98a2 YZ	417	btrfs_delayed_node_to_tree_ref(struct btrfs_delayed_ref_node *node)
56bec294	418	{
5d4f98a2 YZ	419	return container_of(node, struct btrfs_delayed_tree_ref, node);
5d4f98a2 YZ	420	}
56bec294	421
5d4f98a2 YZ	422	static inline struct btrfs_delayed_data_ref *
	423	btrfs_delayed_node_to_data_ref(struct btrfs_delayed_ref_node *node)
	424	{
5d4f98a2	425	return container_of(node, struct btrfs_delayed_data_ref, node);
56bec294	426	}
9888c340	427
56bec294	428	#endif