delayed-ref.c

/*
 * Copyright (C) 2009 Oracle.  All rights reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public
 * License v2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public
 * License along with this program; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 021110-1307, USA.
 */

#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/sort.h>
#include "ctree.h"
#include "delayed-ref.h"
#include "transaction.h"
#include "qgroup.h"

struct kmem_cache *btrfs_delayed_ref_head_cachep;
struct kmem_cache *btrfs_delayed_tree_ref_cachep;
struct kmem_cache *btrfs_delayed_data_ref_cachep;
struct kmem_cache *btrfs_delayed_extent_op_cachep;
/*
 * delayed back reference update tracking.  For subvolume trees
 * we queue up extent allocations and backref maintenance for
 * delayed processing.   This avoids deep call chains where we
 * add extents in the middle of btrfs_search_slot, and it allows
 * us to buffer up frequently modified backrefs in an rb tree instead
 * of hammering updates on the extent allocation tree.
 */

/*
 * compare two delayed tree backrefs with same bytenr and type
 */
static int comp_tree_refs(struct btrfs_delayed_tree_ref *ref2,
			  struct btrfs_delayed_tree_ref *ref1, int type)
{
	if (type == BTRFS_TREE_BLOCK_REF_KEY) {
		if (ref1->root < ref2->root)
			return -1;
		if (ref1->root > ref2->root)
			return 1;
	} else {
		if (ref1->parent < ref2->parent)
			return -1;
		if (ref1->parent > ref2->parent)
			return 1;
	}
	return 0;
}

/*
 * compare two delayed data backrefs with same bytenr and type
 */
static int comp_data_refs(struct btrfs_delayed_data_ref *ref2,
			  struct btrfs_delayed_data_ref *ref1)
{
	if (ref1->node.type == BTRFS_EXTENT_DATA_REF_KEY) {
		if (ref1->root < ref2->root)
			return -1;
		if (ref1->root > ref2->root)
			return 1;
		if (ref1->objectid < ref2->objectid)
			return -1;
		if (ref1->objectid > ref2->objectid)
			return 1;
		if (ref1->offset < ref2->offset)
			return -1;
		if (ref1->offset > ref2->offset)
			return 1;
	} else {
		if (ref1->parent < ref2->parent)
			return -1;
		if (ref1->parent > ref2->parent)
			return 1;
	}
	return 0;
}

/* insert a new ref to head ref rbtree */
static struct btrfs_delayed_ref_head *htree_insert(struct rb_root *root,
						   struct rb_node *node)
{
	struct rb_node **p = &root->rb_node;
	struct rb_node *parent_node = NULL;
	struct btrfs_delayed_ref_head *entry;
	struct btrfs_delayed_ref_head *ins;
	u64 bytenr;

	ins = rb_entry(node, struct btrfs_delayed_ref_head, href_node);
	bytenr = ins->node.bytenr;
	while (*p) {
		parent_node = *p;
		entry = rb_entry(parent_node, struct btrfs_delayed_ref_head,
				 href_node);

		if (bytenr < entry->node.bytenr)
			p = &(*p)->rb_left;
		else if (bytenr > entry->node.bytenr)
			p = &(*p)->rb_right;
		else
			return entry;
	}

	rb_link_node(node, parent_node, p);
	rb_insert_color(node, root);
	return NULL;
}

/*
 * find an head entry based on bytenr. This returns the delayed ref
 * head if it was able to find one, or NULL if nothing was in that spot.
 * If return_bigger is given, the next bigger entry is returned if no exact
 * match is found.
 */
static struct btrfs_delayed_ref_head *
find_ref_head(struct rb_root *root, u64 bytenr,
	      int return_bigger)
{
	struct rb_node *n;
	struct btrfs_delayed_ref_head *entry;

	n = root->rb_node;
	entry = NULL;
	while (n) {
		entry = rb_entry(n, struct btrfs_delayed_ref_head, href_node);

		if (bytenr < entry->node.bytenr)
			n = n->rb_left;
		else if (bytenr > entry->node.bytenr)
			n = n->rb_right;
		else
			return entry;
	}
	if (entry && return_bigger) {
		if (bytenr > entry->node.bytenr) {
			n = rb_next(&entry->href_node);
			if (!n)
				n = rb_first(root);
			entry = rb_entry(n, struct btrfs_delayed_ref_head,
					 href_node);
			return entry;
		}
		return entry;
	}
	return NULL;
}

int btrfs_delayed_ref_lock(struct btrfs_trans_handle *trans,
			   struct btrfs_delayed_ref_head *head)
{
	struct btrfs_delayed_ref_root *delayed_refs;

	delayed_refs = &trans->transaction->delayed_refs;
	assert_spin_locked(&delayed_refs->lock);
	if (mutex_trylock(&head->mutex))
		return 0;

	atomic_inc(&head->node.refs);
	spin_unlock(&delayed_refs->lock);

	mutex_lock(&head->mutex);
	spin_lock(&delayed_refs->lock);
	if (!head->node.in_tree) {
		mutex_unlock(&head->mutex);
		btrfs_put_delayed_ref(&head->node);
		return -EAGAIN;
	}
	btrfs_put_delayed_ref(&head->node);
	return 0;
}

static inline void drop_delayed_ref(struct btrfs_trans_handle *trans,
				    struct btrfs_delayed_ref_root *delayed_refs,
				    struct btrfs_delayed_ref_head *head,
				    struct btrfs_delayed_ref_node *ref)
{
	if (btrfs_delayed_ref_is_head(ref)) {
		head = btrfs_delayed_node_to_head(ref);
		rb_erase(&head->href_node, &delayed_refs->href_root);
	} else {
		assert_spin_locked(&head->lock);
		list_del(&ref->list);
	}
	ref->in_tree = 0;
	btrfs_put_delayed_ref(ref);
	atomic_dec(&delayed_refs->num_entries);
	if (trans->delayed_ref_updates)
		trans->delayed_ref_updates--;
}

static bool merge_ref(struct btrfs_trans_handle *trans,
		      struct btrfs_delayed_ref_root *delayed_refs,
		      struct btrfs_delayed_ref_head *head,
		      struct btrfs_delayed_ref_node *ref,
		      u64 seq)
{
	struct btrfs_delayed_ref_node *next;
	bool done = false;

	next = list_first_entry(&head->ref_list, struct btrfs_delayed_ref_node,
				list);
	while (!done && &next->list != &head->ref_list) {
		int mod;
		struct btrfs_delayed_ref_node *next2;

		next2 = list_next_entry(next, list);

		if (next == ref)
			goto next;

		if (seq && next->seq >= seq)
			goto next;

		if (next->type != ref->type)
			goto next;

		if ((ref->type == BTRFS_TREE_BLOCK_REF_KEY ||
		     ref->type == BTRFS_SHARED_BLOCK_REF_KEY) &&
		    comp_tree_refs(btrfs_delayed_node_to_tree_ref(ref),
				   btrfs_delayed_node_to_tree_ref(next),
				   ref->type))
			goto next;
		if ((ref->type == BTRFS_EXTENT_DATA_REF_KEY ||
		     ref->type == BTRFS_SHARED_DATA_REF_KEY) &&
		    comp_data_refs(btrfs_delayed_node_to_data_ref(ref),
				   btrfs_delayed_node_to_data_ref(next)))
			goto next;

		if (ref->action == next->action) {
			mod = next->ref_mod;
		} else {
			if (ref->ref_mod < next->ref_mod) {
				swap(ref, next);
				done = true;
			}
			mod = -next->ref_mod;
		}

		drop_delayed_ref(trans, delayed_refs, head, next);
		ref->ref_mod += mod;
		if (ref->ref_mod == 0) {
			drop_delayed_ref(trans, delayed_refs, head, ref);
			done = true;
		} else {
			/*
			 * Can't have multiples of the same ref on a tree block.
			 */
			WARN_ON(ref->type == BTRFS_TREE_BLOCK_REF_KEY ||
				ref->type == BTRFS_SHARED_BLOCK_REF_KEY);
		}
next:
		next = next2;
	}

	return done;
}

void btrfs_merge_delayed_refs(struct btrfs_trans_handle *trans,
			      struct btrfs_fs_info *fs_info,
			      struct btrfs_delayed_ref_root *delayed_refs,
			      struct btrfs_delayed_ref_head *head)
{
	struct btrfs_delayed_ref_node *ref;
	u64 seq = 0;

	assert_spin_locked(&head->lock);

	if (list_empty(&head->ref_list))
		return;

	/* We don't have too many refs to merge for data. */
	if (head->is_data)
		return;

	spin_lock(&fs_info->tree_mod_seq_lock);
	if (!list_empty(&fs_info->tree_mod_seq_list)) {
		struct seq_list *elem;

		elem = list_first_entry(&fs_info->tree_mod_seq_list,
					struct seq_list, list);
		seq = elem->seq;
	}
	spin_unlock(&fs_info->tree_mod_seq_lock);

	ref = list_first_entry(&head->ref_list, struct btrfs_delayed_ref_node,
			       list);
	while (&ref->list != &head->ref_list) {
		if (seq && ref->seq >= seq)
			goto next;

		if (merge_ref(trans, delayed_refs, head, ref, seq)) {
			if (list_empty(&head->ref_list))
				break;
			ref = list_first_entry(&head->ref_list,
					       struct btrfs_delayed_ref_node,
					       list);
			continue;
		}
next:
		ref = list_next_entry(ref, list);
	}
}

int btrfs_check_delayed_seq(struct btrfs_fs_info *fs_info,
			    struct btrfs_delayed_ref_root *delayed_refs,
			    u64 seq)
{
	struct seq_list *elem;
	int ret = 0;

	spin_lock(&fs_info->tree_mod_seq_lock);
	if (!list_empty(&fs_info->tree_mod_seq_list)) {
		elem = list_first_entry(&fs_info->tree_mod_seq_list,
					struct seq_list, list);
		if (seq >= elem->seq) {
			pr_debug("holding back delayed_ref %#x.%x, lowest is %#x.%x (%p)\n",
				 (u32)(seq >> 32), (u32)seq,
				 (u32)(elem->seq >> 32), (u32)elem->seq,
				 delayed_refs);
			ret = 1;
		}
	}

	spin_unlock(&fs_info->tree_mod_seq_lock);
	return ret;
}

struct btrfs_delayed_ref_head *
btrfs_select_ref_head(struct btrfs_trans_handle *trans)
{
	struct btrfs_delayed_ref_root *delayed_refs;
	struct btrfs_delayed_ref_head *head;
	u64 start;
	bool loop = false;

	delayed_refs = &trans->transaction->delayed_refs;

again:
	start = delayed_refs->run_delayed_start;
	head = find_ref_head(&delayed_refs->href_root, start, 1);
	if (!head && !loop) {
		delayed_refs->run_delayed_start = 0;
		start = 0;
		loop = true;
		head = find_ref_head(&delayed_refs->href_root, start, 1);
		if (!head)
			return NULL;
	} else if (!head && loop) {
		return NULL;
	}

	while (head->processing) {
		struct rb_node *node;

		node = rb_next(&head->href_node);
		if (!node) {
			if (loop)
				return NULL;
			delayed_refs->run_delayed_start = 0;
			start = 0;
			loop = true;
			goto again;
		}
		head = rb_entry(node, struct btrfs_delayed_ref_head,
				href_node);
	}

	head->processing = 1;
	WARN_ON(delayed_refs->num_heads_ready == 0);
	delayed_refs->num_heads_ready--;
	delayed_refs->run_delayed_start = head->node.bytenr +
		head->node.num_bytes;
	return head;
}

/*
 * Helper to insert the ref_node to the tail or merge with tail.
 *
 * Return 0 for insert.
 * Return >0 for merge.
 */
static int
add_delayed_ref_tail_merge(struct btrfs_trans_handle *trans,
			   struct btrfs_delayed_ref_root *root,
			   struct btrfs_delayed_ref_head *href,
			   struct btrfs_delayed_ref_node *ref)
{
	struct btrfs_delayed_ref_node *exist;
	int mod;
	int ret = 0;

	spin_lock(&href->lock);
	/* Check whether we can merge the tail node with ref */
	if (list_empty(&href->ref_list))
		goto add_tail;
	exist = list_entry(href->ref_list.prev, struct btrfs_delayed_ref_node,
			   list);
	/* No need to compare bytenr nor is_head */
	if (exist->type != ref->type || exist->seq != ref->seq)
		goto add_tail;

	if ((exist->type == BTRFS_TREE_BLOCK_REF_KEY ||
	     exist->type == BTRFS_SHARED_BLOCK_REF_KEY) &&
	    comp_tree_refs(btrfs_delayed_node_to_tree_ref(exist),
			   btrfs_delayed_node_to_tree_ref(ref),
			   ref->type))
		goto add_tail;
	if ((exist->type == BTRFS_EXTENT_DATA_REF_KEY ||
	     exist->type == BTRFS_SHARED_DATA_REF_KEY) &&
	    comp_data_refs(btrfs_delayed_node_to_data_ref(exist),
			   btrfs_delayed_node_to_data_ref(ref)))
		goto add_tail;

	/* Now we are sure we can merge */
	ret = 1;
	if (exist->action == ref->action) {
		mod = ref->ref_mod;
	} else {
		/* Need to change action */
		if (exist->ref_mod < ref->ref_mod) {
			exist->action = ref->action;
			mod = -exist->ref_mod;
			exist->ref_mod = ref->ref_mod;
		} else
			mod = -ref->ref_mod;
	}
	exist->ref_mod += mod;

	/* remove existing tail if its ref_mod is zero */
	if (exist->ref_mod == 0)
		drop_delayed_ref(trans, root, href, exist);
	spin_unlock(&href->lock);
	return ret;

add_tail:
	list_add_tail(&ref->list, &href->ref_list);
	atomic_inc(&root->num_entries);
	trans->delayed_ref_updates++;
	spin_unlock(&href->lock);
	return ret;
}

/*
 * helper function to update the accounting in the head ref
 * existing and update must have the same bytenr
 */
static noinline void
update_existing_head_ref(struct btrfs_delayed_ref_root *delayed_refs,
			 struct btrfs_delayed_ref_node *existing,
			 struct btrfs_delayed_ref_node *update)
{
	struct btrfs_delayed_ref_head *existing_ref;
	struct btrfs_delayed_ref_head *ref;
	int old_ref_mod;

	existing_ref = btrfs_delayed_node_to_head(existing);
	ref = btrfs_delayed_node_to_head(update);
	BUG_ON(existing_ref->is_data != ref->is_data);

	spin_lock(&existing_ref->lock);
	if (ref->must_insert_reserved) {
		/* if the extent was freed and then
		 * reallocated before the delayed ref
		 * entries were processed, we can end up
		 * with an existing head ref without
		 * the must_insert_reserved flag set.
		 * Set it again here
		 */
		existing_ref->must_insert_reserved = ref->must_insert_reserved;

		/*
		 * update the num_bytes so we make sure the accounting
		 * is done correctly
		 */
		existing->num_bytes = update->num_bytes;

	}

	if (ref->extent_op) {
		if (!existing_ref->extent_op) {
			existing_ref->extent_op = ref->extent_op;
		} else {
			if (ref->extent_op->update_key) {
				memcpy(&existing_ref->extent_op->key,
				       &ref->extent_op->key,
				       sizeof(ref->extent_op->key));
				existing_ref->extent_op->update_key = true;
			}
			if (ref->extent_op->update_flags) {
				existing_ref->extent_op->flags_to_set |=
					ref->extent_op->flags_to_set;
				existing_ref->extent_op->update_flags = true;
			}
			btrfs_free_delayed_extent_op(ref->extent_op);
		}
	}
	/*
	 * update the reference mod on the head to reflect this new operation,
	 * only need the lock for this case cause we could be processing it
	 * currently, for refs we just added we know we're a-ok.
	 */
	old_ref_mod = existing_ref->total_ref_mod;
	existing->ref_mod += update->ref_mod;
	existing_ref->total_ref_mod += update->ref_mod;

	/*
	 * If we are going to from a positive ref mod to a negative or vice
	 * versa we need to make sure to adjust pending_csums accordingly.
	 */
	if (existing_ref->is_data) {
		if (existing_ref->total_ref_mod >= 0 && old_ref_mod < 0)
			delayed_refs->pending_csums -= existing->num_bytes;
		if (existing_ref->total_ref_mod < 0 && old_ref_mod >= 0)
			delayed_refs->pending_csums += existing->num_bytes;
	}
	spin_unlock(&existing_ref->lock);
}

/*
 * helper function to actually insert a head node into the rbtree.
 * this does all the dirty work in terms of maintaining the correct
 * overall modification count.
 */
static noinline struct btrfs_delayed_ref_head *
add_delayed_ref_head(struct btrfs_fs_info *fs_info,
		     struct btrfs_trans_handle *trans,
		     struct btrfs_delayed_ref_node *ref,
		     struct btrfs_qgroup_extent_record *qrecord,
		     u64 bytenr, u64 num_bytes, u64 ref_root, u64 reserved,
		     int action, int is_data)
{
	struct btrfs_delayed_ref_head *existing;
	struct btrfs_delayed_ref_head *head_ref = NULL;
	struct btrfs_delayed_ref_root *delayed_refs;
	struct btrfs_qgroup_extent_record *qexisting;
	int count_mod = 1;
	int must_insert_reserved = 0;

	/* If reserved is provided, it must be a data extent. */
	BUG_ON(!is_data && reserved);

	/*
	 * the head node stores the sum of all the mods, so dropping a ref
	 * should drop the sum in the head node by one.
	 */
	if (action == BTRFS_UPDATE_DELAYED_HEAD)
		count_mod = 0;
	else if (action == BTRFS_DROP_DELAYED_REF)
		count_mod = -1;

	/*
	 * BTRFS_ADD_DELAYED_EXTENT means that we need to update
	 * the reserved accounting when the extent is finally added, or
	 * if a later modification deletes the delayed ref without ever
	 * inserting the extent into the extent allocation tree.
	 * ref->must_insert_reserved is the flag used to record
	 * that accounting mods are required.
	 *
	 * Once we record must_insert_reserved, switch the action to
	 * BTRFS_ADD_DELAYED_REF because other special casing is not required.
	 */
	if (action == BTRFS_ADD_DELAYED_EXTENT)
		must_insert_reserved = 1;
	else
		must_insert_reserved = 0;

	delayed_refs = &trans->transaction->delayed_refs;

	/* first set the basic ref node struct up */
	atomic_set(&ref->refs, 1);
	ref->bytenr = bytenr;
	ref->num_bytes = num_bytes;
	ref->ref_mod = count_mod;
	ref->type  = 0;
	ref->action  = 0;
	ref->is_head = 1;
	ref->in_tree = 1;
	ref->seq = 0;

	head_ref = btrfs_delayed_node_to_head(ref);
	head_ref->must_insert_reserved = must_insert_reserved;
	head_ref->is_data = is_data;
	INIT_LIST_HEAD(&head_ref->ref_list);
	head_ref->processing = 0;
	head_ref->total_ref_mod = count_mod;
	head_ref->qgroup_reserved = 0;
	head_ref->qgroup_ref_root = 0;

	/* Record qgroup extent info if provided */
	if (qrecord) {
		if (ref_root && reserved) {
			head_ref->qgroup_ref_root = ref_root;
			head_ref->qgroup_reserved = reserved;
		}

		qrecord->bytenr = bytenr;
		qrecord->num_bytes = num_bytes;
		qrecord->old_roots = NULL;

		qexisting = btrfs_qgroup_insert_dirty_extent(fs_info,
							     delayed_refs,
							     qrecord);
		if (qexisting)
			kfree(qrecord);
	}

	spin_lock_init(&head_ref->lock);
	mutex_init(&head_ref->mutex);

	trace_add_delayed_ref_head(fs_info, ref, head_ref, action);

	existing = htree_insert(&delayed_refs->href_root,
				&head_ref->href_node);
	if (existing) {
		WARN_ON(ref_root && reserved && existing->qgroup_ref_root
			&& existing->qgroup_reserved);
		update_existing_head_ref(delayed_refs, &existing->node, ref);
		/*
		 * we've updated the existing ref, free the newly
		 * allocated ref
		 */
		kmem_cache_free(btrfs_delayed_ref_head_cachep, head_ref);
		head_ref = existing;
	} else {
		if (is_data && count_mod < 0)
			delayed_refs->pending_csums += num_bytes;
		delayed_refs->num_heads++;
		delayed_refs->num_heads_ready++;
		atomic_inc(&delayed_refs->num_entries);
		trans->delayed_ref_updates++;
	}
	return head_ref;
}

/*
 * helper to insert a delayed tree ref into the rbtree.
 */
static noinline void
add_delayed_tree_ref(struct btrfs_fs_info *fs_info,
		     struct btrfs_trans_handle *trans,
		     struct btrfs_delayed_ref_head *head_ref,
		     struct btrfs_delayed_ref_node *ref, u64 bytenr,
		     u64 num_bytes, u64 parent, u64 ref_root, int level,
		     int action)
{
	struct btrfs_delayed_tree_ref *full_ref;
	struct btrfs_delayed_ref_root *delayed_refs;
	u64 seq = 0;
	int ret;

	if (action == BTRFS_ADD_DELAYED_EXTENT)
		action = BTRFS_ADD_DELAYED_REF;

	if (is_fstree(ref_root))
		seq = atomic64_read(&fs_info->tree_mod_seq);
	delayed_refs = &trans->transaction->delayed_refs;

	/* first set the basic ref node struct up */
	atomic_set(&ref->refs, 1);
	ref->bytenr = bytenr;
	ref->num_bytes = num_bytes;
	ref->ref_mod = 1;
	ref->action = action;
	ref->is_head = 0;
	ref->in_tree = 1;
	ref->seq = seq;

	full_ref = btrfs_delayed_node_to_tree_ref(ref);
	full_ref->parent = parent;
	full_ref->root = ref_root;
	if (parent)
		ref->type = BTRFS_SHARED_BLOCK_REF_KEY;
	else
		ref->type = BTRFS_TREE_BLOCK_REF_KEY;
	full_ref->level = level;

	trace_add_delayed_tree_ref(fs_info, ref, full_ref, action);

	ret = add_delayed_ref_tail_merge(trans, delayed_refs, head_ref, ref);

	/*
	 * XXX: memory should be freed at the same level allocated.
	 * But bad practice is anywhere... Follow it now. Need cleanup.
	 */
	if (ret > 0)
		kmem_cache_free(btrfs_delayed_tree_ref_cachep, full_ref);
}

/*
 * helper to insert a delayed data ref into the rbtree.
 */
static noinline void
add_delayed_data_ref(struct btrfs_fs_info *fs_info,
		     struct btrfs_trans_handle *trans,
		     struct btrfs_delayed_ref_head *head_ref,
		     struct btrfs_delayed_ref_node *ref, u64 bytenr,
		     u64 num_bytes, u64 parent, u64 ref_root, u64 owner,
		     u64 offset, int action)
{
	struct btrfs_delayed_data_ref *full_ref;
	struct btrfs_delayed_ref_root *delayed_refs;
	u64 seq = 0;
	int ret;

	if (action == BTRFS_ADD_DELAYED_EXTENT)
		action = BTRFS_ADD_DELAYED_REF;

	delayed_refs = &trans->transaction->delayed_refs;

	if (is_fstree(ref_root))
		seq = atomic64_read(&fs_info->tree_mod_seq);

	/* first set the basic ref node struct up */
	atomic_set(&ref->refs, 1);
	ref->bytenr = bytenr;
	ref->num_bytes = num_bytes;
	ref->ref_mod = 1;
	ref->action = action;
	ref->is_head = 0;
	ref->in_tree = 1;
	ref->seq = seq;

	full_ref = btrfs_delayed_node_to_data_ref(ref);
	full_ref->parent = parent;
	full_ref->root = ref_root;
	if (parent)
		ref->type = BTRFS_SHARED_DATA_REF_KEY;
	else
		ref->type = BTRFS_EXTENT_DATA_REF_KEY;

	full_ref->objectid = owner;
	full_ref->offset = offset;

	trace_add_delayed_data_ref(fs_info, ref, full_ref, action);

	ret = add_delayed_ref_tail_merge(trans, delayed_refs, head_ref, ref);

	if (ret > 0)
		kmem_cache_free(btrfs_delayed_data_ref_cachep, full_ref);
}

/*
 * add a delayed tree ref.  This does all of the accounting required
 * to make sure the delayed ref is eventually processed before this
 * transaction commits.
 */
int btrfs_add_delayed_tree_ref(struct btrfs_fs_info *fs_info,
			       struct btrfs_trans_handle *trans,
			       u64 bytenr, u64 num_bytes, u64 parent,
			       u64 ref_root,  int level, int action,
			       struct btrfs_delayed_extent_op *extent_op)
{
	struct btrfs_delayed_tree_ref *ref;
	struct btrfs_delayed_ref_head *head_ref;
	struct btrfs_delayed_ref_root *delayed_refs;
	struct btrfs_qgroup_extent_record *record = NULL;

	BUG_ON(extent_op && extent_op->is_data);
	ref = kmem_cache_alloc(btrfs_delayed_tree_ref_cachep, GFP_NOFS);
	if (!ref)
		return -ENOMEM;

	head_ref = kmem_cache_alloc(btrfs_delayed_ref_head_cachep, GFP_NOFS);
	if (!head_ref)
		goto free_ref;

	if (fs_info->quota_enabled && is_fstree(ref_root)) {
		record = kmalloc(sizeof(*record), GFP_NOFS);
		if (!record)
			goto free_head_ref;
	}

	head_ref->extent_op = extent_op;

	delayed_refs = &trans->transaction->delayed_refs;
	spin_lock(&delayed_refs->lock);

	/*
	 * insert both the head node and the new ref without dropping
	 * the spin lock
	 */
	head_ref = add_delayed_ref_head(fs_info, trans, &head_ref->node, record,
					bytenr, num_bytes, 0, 0, action, 0);

	add_delayed_tree_ref(fs_info, trans, head_ref, &ref->node, bytenr,
			     num_bytes, parent, ref_root, level, action);
	spin_unlock(&delayed_refs->lock);

	return 0;

free_head_ref:
	kmem_cache_free(btrfs_delayed_ref_head_cachep, head_ref);
free_ref:
	kmem_cache_free(btrfs_delayed_tree_ref_cachep, ref);

	return -ENOMEM;
}

/*
 * add a delayed data ref. it's similar to btrfs_add_delayed_tree_ref.
 */
int btrfs_add_delayed_data_ref(struct btrfs_fs_info *fs_info,
			       struct btrfs_trans_handle *trans,
			       u64 bytenr, u64 num_bytes,
			       u64 parent, u64 ref_root,
			       u64 owner, u64 offset, u64 reserved, int action,
			       struct btrfs_delayed_extent_op *extent_op)
{
	struct btrfs_delayed_data_ref *ref;
	struct btrfs_delayed_ref_head *head_ref;
	struct btrfs_delayed_ref_root *delayed_refs;
	struct btrfs_qgroup_extent_record *record = NULL;

	BUG_ON(extent_op && !extent_op->is_data);
	ref = kmem_cache_alloc(btrfs_delayed_data_ref_cachep, GFP_NOFS);
	if (!ref)
		return -ENOMEM;

	head_ref = kmem_cache_alloc(btrfs_delayed_ref_head_cachep, GFP_NOFS);
	if (!head_ref) {
		kmem_cache_free(btrfs_delayed_data_ref_cachep, ref);
		return -ENOMEM;
	}

	if (fs_info->quota_enabled && is_fstree(ref_root)) {
		record = kmalloc(sizeof(*record), GFP_NOFS);
		if (!record) {
			kmem_cache_free(btrfs_delayed_data_ref_cachep, ref);
			kmem_cache_free(btrfs_delayed_ref_head_cachep,
					head_ref);
			return -ENOMEM;
		}
	}

	head_ref->extent_op = extent_op;

	delayed_refs = &trans->transaction->delayed_refs;
	spin_lock(&delayed_refs->lock);

	/*
	 * insert both the head node and the new ref without dropping
	 * the spin lock
	 */
	head_ref = add_delayed_ref_head(fs_info, trans, &head_ref->node, record,
					bytenr, num_bytes, ref_root, reserved,
					action, 1);

	add_delayed_data_ref(fs_info, trans, head_ref, &ref->node, bytenr,
				   num_bytes, parent, ref_root, owner, offset,
				   action);
	spin_unlock(&delayed_refs->lock);

	return 0;
}

int btrfs_add_delayed_extent_op(struct btrfs_fs_info *fs_info,
				struct btrfs_trans_handle *trans,
				u64 bytenr, u64 num_bytes,
				struct btrfs_delayed_extent_op *extent_op)
{
	struct btrfs_delayed_ref_head *head_ref;
	struct btrfs_delayed_ref_root *delayed_refs;

	head_ref = kmem_cache_alloc(btrfs_delayed_ref_head_cachep, GFP_NOFS);
	if (!head_ref)
		return -ENOMEM;

	head_ref->extent_op = extent_op;

	delayed_refs = &trans->transaction->delayed_refs;
	spin_lock(&delayed_refs->lock);

	add_delayed_ref_head(fs_info, trans, &head_ref->node, NULL, bytenr,
			     num_bytes, 0, 0, BTRFS_UPDATE_DELAYED_HEAD,
			     extent_op->is_data);

	spin_unlock(&delayed_refs->lock);
	return 0;
}

/*
 * this does a simple search for the head node for a given extent.
 * It must be called with the delayed ref spinlock held, and it returns
 * the head node if any where found, or NULL if not.
 */
struct btrfs_delayed_ref_head *
btrfs_find_delayed_ref_head(struct btrfs_trans_handle *trans, u64 bytenr)
{
	struct btrfs_delayed_ref_root *delayed_refs;

	delayed_refs = &trans->transaction->delayed_refs;
	return find_ref_head(&delayed_refs->href_root, bytenr, 0);
}

void btrfs_delayed_ref_exit(void)
{
	kmem_cache_destroy(btrfs_delayed_ref_head_cachep);
	kmem_cache_destroy(btrfs_delayed_tree_ref_cachep);
	kmem_cache_destroy(btrfs_delayed_data_ref_cachep);
	kmem_cache_destroy(btrfs_delayed_extent_op_cachep);
}

int btrfs_delayed_ref_init(void)
{
	btrfs_delayed_ref_head_cachep = kmem_cache_create(
				"btrfs_delayed_ref_head",
				sizeof(struct btrfs_delayed_ref_head), 0,
				SLAB_MEM_SPREAD, NULL);
	if (!btrfs_delayed_ref_head_cachep)
		goto fail;

	btrfs_delayed_tree_ref_cachep = kmem_cache_create(
				"btrfs_delayed_tree_ref",
				sizeof(struct btrfs_delayed_tree_ref), 0,
				SLAB_MEM_SPREAD, NULL);
	if (!btrfs_delayed_tree_ref_cachep)
		goto fail;

	btrfs_delayed_data_ref_cachep = kmem_cache_create(
				"btrfs_delayed_data_ref",
				sizeof(struct btrfs_delayed_data_ref), 0,
				SLAB_MEM_SPREAD, NULL);
	if (!btrfs_delayed_data_ref_cachep)
		goto fail;

	btrfs_delayed_extent_op_cachep = kmem_cache_create(
				"btrfs_delayed_extent_op",
				sizeof(struct btrfs_delayed_extent_op), 0,
				SLAB_MEM_SPREAD, NULL);
	if (!btrfs_delayed_extent_op_cachep)
		goto fail;

	return 0;
fail:
	btrfs_delayed_ref_exit();
	return -ENOMEM;
}