diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index d48b22f31182..851f2355f3c8 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -3448,7 +3448,7 @@ enum btrfs_reserve_flush_enum {
 	BTRFS_RESERVE_FLUSH_ALL,
 };
 
-int btrfs_check_data_free_space(struct inode *inode, u64 bytes);
+int btrfs_check_data_free_space(struct inode *inode, u64 bytes, u64 write_bytes);
 void btrfs_free_reserved_data_space(struct inode *inode, u64 bytes);
 void btrfs_trans_release_metadata(struct btrfs_trans_handle *trans,
 				struct btrfs_root *root);
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 4d3774605a85..1eef4ee01d1a 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -3331,7 +3331,7 @@ again:
 	num_pages *= 16;
 	num_pages *= PAGE_CACHE_SIZE;
 
-	ret = btrfs_check_data_free_space(inode, num_pages);
+	ret = btrfs_check_data_free_space(inode, num_pages, num_pages);
 	if (ret)
 		goto out_put;
 
@@ -3851,7 +3851,7 @@ u64 btrfs_get_alloc_profile(struct btrfs_root *root, int data)
  * This will check the space that the inode allocates from to make sure we have
  * enough space for bytes.
  */
-int btrfs_check_data_free_space(struct inode *inode, u64 bytes)
+int btrfs_check_data_free_space(struct inode *inode, u64 bytes, u64 write_bytes)
 {
 	struct btrfs_space_info *data_sinfo;
 	struct btrfs_root *root = BTRFS_I(inode)->root;
@@ -3969,7 +3969,7 @@ commit_trans:
 					      data_sinfo->flags, bytes, 1);
 		return -ENOSPC;
 	}
-	ret = btrfs_qgroup_reserve(root, bytes);
+	ret = btrfs_qgroup_reserve(root, write_bytes);
 	if (ret)
 		goto out;
 	data_sinfo->bytes_may_use += bytes;
@@ -3995,7 +3995,6 @@ void btrfs_free_reserved_data_space(struct inode *inode, u64 bytes)
 	data_sinfo = root->fs_info->data_sinfo;
 	spin_lock(&data_sinfo->lock);
 	WARN_ON(data_sinfo->bytes_may_use < bytes);
-	btrfs_qgroup_free(root, bytes);
 	data_sinfo->bytes_may_use -= bytes;
 	trace_btrfs_space_reservation(root->fs_info, "space_info",
 				      data_sinfo->flags, bytes, 0);
@@ -5243,8 +5242,6 @@ void btrfs_subvolume_release_metadata(struct btrfs_root *root,
 				      u64 qgroup_reserved)
 {
 	btrfs_block_rsv_release(root, rsv, (u64)-1);
-	if (qgroup_reserved)
-		btrfs_qgroup_free(root, qgroup_reserved);
 }
 
 /**
@@ -5478,11 +5475,8 @@ out_fail:
 			to_free = 0;
 	}
 	spin_unlock(&BTRFS_I(inode)->lock);
-	if (dropped) {
-		if (root->fs_info->quota_enabled)
-			btrfs_qgroup_free(root, dropped * root->nodesize);
+	if (dropped)
 		to_free += btrfs_calc_trans_metadata_size(root, dropped);
-	}
 
 	if (to_free) {
 		btrfs_block_rsv_release(root, block_rsv, to_free);
@@ -5524,9 +5518,6 @@ void btrfs_delalloc_release_metadata(struct inode *inode, u64 num_bytes)
 
 	trace_btrfs_space_reservation(root->fs_info, "delalloc",
 				      btrfs_ino(inode), to_free, 0);
-	if (root->fs_info->quota_enabled) {
-		btrfs_qgroup_free(root, dropped * root->nodesize);
-	}
 
 	btrfs_block_rsv_release(root, &root->fs_info->delalloc_block_rsv,
 				to_free);
@@ -5551,7 +5542,7 @@ int btrfs_delalloc_reserve_space(struct inode *inode, u64 num_bytes)
 {
 	int ret;
 
-	ret = btrfs_check_data_free_space(inode, num_bytes);
+	ret = btrfs_check_data_free_space(inode, num_bytes, num_bytes);
 	if (ret)
 		return ret;
 
@@ -5727,12 +5718,8 @@ static int pin_down_extent(struct btrfs_root *root,
 
 	set_extent_dirty(root->fs_info->pinned_extents, bytenr,
 			 bytenr + num_bytes - 1, GFP_NOFS | __GFP_NOFAIL);
-	if (reserved) {
-		btrfs_qgroup_update_reserved_bytes(root->fs_info,
-						   root->root_key.objectid,
-						   num_bytes, -1);
+	if (reserved)
 		trace_btrfs_reserved_extent_free(root, bytenr, num_bytes);
-	}
 	return 0;
 }
 
@@ -6470,9 +6457,6 @@ void btrfs_free_tree_block(struct btrfs_trans_handle *trans,
 		btrfs_put_block_group(cache);
 		trace_btrfs_reserved_extent_free(root, buf->start, buf->len);
 		pin = 0;
-		btrfs_qgroup_update_reserved_bytes(root->fs_info,
-						   root->root_key.objectid,
-						   buf->len, -1);
 	}
 out:
 	if (pin)
@@ -7205,9 +7189,6 @@ static int __btrfs_free_reserved_extent(struct btrfs_root *root,
 			ret = btrfs_discard_extent(root, start, len, NULL);
 		btrfs_add_free_space(cache, start, len);
 		btrfs_update_reserved_bytes(cache, len, RESERVE_FREE, delalloc);
-		btrfs_qgroup_update_reserved_bytes(root->fs_info,
-						   root->root_key.objectid,
-						   len, -1);
 	}
 
 	btrfs_put_block_group(cache);
@@ -7446,9 +7427,6 @@ int btrfs_alloc_logged_file_extent(struct btrfs_trans_handle *trans,
 	BUG_ON(ret); /* logic error */
 	ret = alloc_reserved_file_extent(trans, root, 0, root_objectid,
 					 0, owner, offset, ins, 1);
-	btrfs_qgroup_update_reserved_bytes(root->fs_info,
-					   root->root_key.objectid,
-					   ins->offset, 1);
 	btrfs_put_block_group(block_group);
 	return ret;
 }
@@ -7595,10 +7573,6 @@ struct extent_buffer *btrfs_alloc_tree_block(struct btrfs_trans_handle *trans,
 		return ERR_PTR(ret);
 	}
 
-	btrfs_qgroup_update_reserved_bytes(root->fs_info,
-					   root_objectid,
-					   ins.offset, 1);
-
 	buf = btrfs_init_new_buffer(trans, root, ins.objectid, level);
 	BUG_ON(IS_ERR(buf)); /* -ENOMEM */
 
diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index faef1d64394d..23b6e03f8465 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -1510,7 +1510,7 @@ static noinline ssize_t __btrfs_buffered_write(struct file *file,
 		}
 
 		reserve_bytes = num_pages << PAGE_CACHE_SHIFT;
-		ret = btrfs_check_data_free_space(inode, reserve_bytes);
+		ret = btrfs_check_data_free_space(inode, reserve_bytes, write_bytes);
 		if (ret == -ENOSPC &&
 		    (BTRFS_I(inode)->flags & (BTRFS_INODE_NODATACOW |
 					      BTRFS_INODE_PREALLOC))) {
@@ -2573,7 +2573,7 @@ static long btrfs_fallocate(struct file *file, int mode,
 	 * Make sure we have enough space before we do the
 	 * allocation.
 	 */
-	ret = btrfs_check_data_free_space(inode, alloc_end - alloc_start);
+	ret = btrfs_check_data_free_space(inode, alloc_end - alloc_start, alloc_end - alloc_start);
 	if (ret)
 		return ret;
 
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index a9f69a0d4b08..27b59b8362f9 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -754,9 +754,6 @@ retry:
 			}
 			goto out_free;
 		}
-		btrfs_qgroup_update_reserved_bytes(root->fs_info,
-						   root->root_key.objectid,
-						   ins.offset, 1);
 		/*
 		 * here we're doing allocation and writeback of the
 		 * compressed pages
@@ -981,10 +978,6 @@ static noinline int cow_file_range(struct inode *inode,
 		if (ret < 0)
 			goto out_unlock;
 
-		btrfs_qgroup_update_reserved_bytes(root->fs_info,
-						   root->root_key.objectid,
-						   ins.offset, 1);
-
 		em = alloc_extent_map();
 		if (!em) {
 			ret = -ENOMEM;
@@ -7037,10 +7030,6 @@ static struct extent_map *btrfs_new_extent_direct(struct inode *inode,
 		return ERR_PTR(ret);
 	}
 
-	btrfs_qgroup_update_reserved_bytes(root->fs_info,
-					   root->root_key.objectid,
-					   ins.offset, 1);
-
 	return em;
 }
 
@@ -9595,10 +9584,6 @@ static int __btrfs_prealloc_file_range(struct inode *inode, int mode,
 			break;
 		}
 
-		btrfs_qgroup_update_reserved_bytes(root->fs_info,
-						   root->root_key.objectid,
-						   ins.offset, 1);
-
 		btrfs_drop_extent_cache(inode, cur_offset,
 					cur_offset + ins.offset -1, 0);
 
diff --git a/fs/btrfs/qgroup.c b/fs/btrfs/qgroup.c
index cd291733dc3e..17881ad8ed96 100644
--- a/fs/btrfs/qgroup.c
+++ b/fs/btrfs/qgroup.c
@@ -72,7 +72,6 @@ struct btrfs_qgroup {
 	/*
 	 * reservation tracking
 	 */
-	u64 may_use;
 	u64 reserved;
 
 	/*
@@ -2383,67 +2382,6 @@ out:
 	return ret;
 }
 
-int btrfs_qgroup_update_reserved_bytes(struct btrfs_fs_info *fs_info,
-					    u64 ref_root,
-					    u64 num_bytes,
-					    int sign)
-{
-	struct btrfs_root *quota_root;
-	struct btrfs_qgroup *qgroup;
-	int ret = 0;
-	struct ulist_node *unode;
-	struct ulist_iterator uiter;
-
-	if (!is_fstree(ref_root) || !fs_info->quota_enabled)
-		return 0;
-
-	if (num_bytes == 0)
-		return 0;
-
-	spin_lock(&fs_info->qgroup_lock);
-	quota_root = fs_info->quota_root;
-	if (!quota_root)
-		goto out;
-
-	qgroup = find_qgroup_rb(fs_info, ref_root);
-	if (!qgroup)
-		goto out;
-
-	ulist_reinit(fs_info->qgroup_ulist);
-	ret = ulist_add(fs_info->qgroup_ulist, qgroup->qgroupid,
-			(uintptr_t)qgroup, GFP_ATOMIC);
-	if (ret < 0)
-		goto out;
-
-	ULIST_ITER_INIT(&uiter);
-	while ((unode = ulist_next(fs_info->qgroup_ulist, &uiter))) {
-		struct btrfs_qgroup *qg;
-		struct btrfs_qgroup_list *glist;
-
-		qg = u64_to_ptr(unode->aux);
-
-		qg->reserved += sign * num_bytes;
-
-		list_for_each_entry(glist, &qg->groups, next_group) {
-			ret = ulist_add(fs_info->qgroup_ulist,
-					glist->group->qgroupid,
-					(uintptr_t)glist->group, GFP_ATOMIC);
-			if (ret < 0)
-				goto out;
-		}
-	}
-
-out:
-	spin_unlock(&fs_info->qgroup_lock);
-	return ret;
-}
-
-/*
- * reserve some space for a qgroup and all its parents. The reservation takes
- * place with start_transaction or dealloc_reserve, similar to ENOSPC
- * accounting. If not enough space is available, EDQUOT is returned.
- * We assume that the requested space is new for all qgroups.
- */
 int btrfs_qgroup_reserve(struct btrfs_root *root, u64 num_bytes)
 {
 	struct btrfs_root *quota_root;
@@ -2486,14 +2424,14 @@ int btrfs_qgroup_reserve(struct btrfs_root *root, u64 num_bytes)
 		qg = u64_to_ptr(unode->aux);
 
 		if ((qg->lim_flags & BTRFS_QGROUP_LIMIT_MAX_RFER) &&
-		    qg->reserved + qg->may_use + (s64)qg->rfer + num_bytes >
+		    qg->reserved + (s64)qg->rfer + num_bytes >
 		    qg->max_rfer) {
 			ret = -EDQUOT;
 			goto out;
 		}
 
 		if ((qg->lim_flags & BTRFS_QGROUP_LIMIT_MAX_EXCL) &&
-		    qg->reserved + qg->may_use + (s64)qg->excl + num_bytes >
+		    qg->reserved + (s64)qg->excl + num_bytes >
 		    qg->max_excl) {
 			ret = -EDQUOT;
 			goto out;
@@ -2517,7 +2455,7 @@ int btrfs_qgroup_reserve(struct btrfs_root *root, u64 num_bytes)
 
 		qg = u64_to_ptr(unode->aux);
 
-		qg->may_use += num_bytes;
+		qg->reserved += num_bytes;
 	}
 
 out:
@@ -2563,7 +2501,7 @@ void btrfs_qgroup_free(struct btrfs_root *root, u64 num_bytes)
 
 		qg = u64_to_ptr(unode->aux);
 
-		qg->may_use -= num_bytes;
+		qg->reserved -= num_bytes;
 
 		list_for_each_entry(glist, &qg->groups, next_group) {
 			ret = ulist_add(fs_info->qgroup_ulist,
diff --git a/fs/btrfs/qgroup.h b/fs/btrfs/qgroup.h
index 64d49b8482b3..c5242aa9a4b2 100644
--- a/fs/btrfs/qgroup.h
+++ b/fs/btrfs/qgroup.h
@@ -94,10 +94,6 @@ int btrfs_run_qgroups(struct btrfs_trans_handle *trans,
 int btrfs_qgroup_inherit(struct btrfs_trans_handle *trans,
 			 struct btrfs_fs_info *fs_info, u64 srcid, u64 objectid,
 			 struct btrfs_qgroup_inherit *inherit);
-int btrfs_qgroup_update_reserved_bytes(struct btrfs_fs_info *fs_info,
-				       u64 ref_root,
-				       u64 num_bytes,
-				       int sign);
 int btrfs_qgroup_reserve(struct btrfs_root *root, u64 num_bytes);
 void btrfs_qgroup_free(struct btrfs_root *root, u64 num_bytes);
 
diff --git a/fs/btrfs/relocation.c b/fs/btrfs/relocation.c
index 840a4eb0f396..74b24b01d574 100644
--- a/fs/btrfs/relocation.c
+++ b/fs/btrfs/relocation.c
@@ -3027,7 +3027,7 @@ int prealloc_file_extent_cluster(struct inode *inode,
 	mutex_lock(&inode->i_mutex);
 
 	ret = btrfs_check_data_free_space(inode, cluster->end +
-					  1 - cluster->start);
+					  1 - cluster->start, 0);
 	if (ret)
 		goto out;