btrfs: move btrfs_account_ro_block_groups_free_space into space-info.c

This was prototyped in ctree.h and the code existed in extent-tree.c,
but it's space-info related so move it into space-info.c.
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/ctree.h

@@ -576,7 +576,6 @@ void btrfs_delalloc_release_extents(struct btrfs_inode *inode, u64 num_bytes);
 
 int btrfs_delalloc_reserve_metadata(struct btrfs_inode *inode, u64 num_bytes,
 				    u64 disk_num_bytes, bool noflush);
-u64 btrfs_account_ro_block_groups_free_space(struct btrfs_space_info *sinfo);
 int btrfs_error_unpin_extent_range(struct btrfs_fs_info *fs_info,
 				   u64 start, u64 end);
 int btrfs_discard_extent(struct btrfs_fs_info *fs_info, u64 bytenr,

fs/btrfs/extent-tree.c

@@ -5975,40 +5975,6 @@ int btrfs_drop_subtree(struct btrfs_trans_handle *trans,
 	return ret;
 }
 
-/*
- * helper to account the unused space of all the readonly block group in the
- * space_info. takes mirrors into account.
- */
-u64 btrfs_account_ro_block_groups_free_space(struct btrfs_space_info *sinfo)
-{
-	struct btrfs_block_group *block_group;
-	u64 free_bytes = 0;
-	int factor;
-
-	/* It's df, we don't care if it's racy */
-	if (list_empty(&sinfo->ro_bgs))
-		return 0;
-
-	spin_lock(&sinfo->lock);
-	list_for_each_entry(block_group, &sinfo->ro_bgs, ro_list) {
-		spin_lock(&block_group->lock);
-
-		if (!block_group->ro) {
-			spin_unlock(&block_group->lock);
-			continue;
-		}
-
-		factor = btrfs_bg_type_to_factor(block_group->flags);
-		free_bytes += (block_group->length -
-			       block_group->used) * factor;
-
-		spin_unlock(&block_group->lock);
-	}
-	spin_unlock(&sinfo->lock);
-
-	return free_bytes;
-}
-
 int btrfs_error_unpin_extent_range(struct btrfs_fs_info *fs_info,
 				   u64 start, u64 end)
 {

fs/btrfs/space-info.c

@@ -1814,3 +1814,37 @@ __cold void btrfs_dump_space_info_for_trans_abort(struct btrfs_fs_info *fs_info)
 	}
 	dump_global_block_rsv(fs_info);
 }
+
+/*
+ * Account the unused space of all the readonly block group in the space_info.
+ * takes mirrors into account.
+ */
+u64 btrfs_account_ro_block_groups_free_space(struct btrfs_space_info *sinfo)
+{
+	struct btrfs_block_group *block_group;
+	u64 free_bytes = 0;
+	int factor;
+
+	/* It's df, we don't care if it's racy */
+	if (list_empty(&sinfo->ro_bgs))
+		return 0;
+
+	spin_lock(&sinfo->lock);
+	list_for_each_entry(block_group, &sinfo->ro_bgs, ro_list) {
+		spin_lock(&block_group->lock);
+
+		if (!block_group->ro) {
+			spin_unlock(&block_group->lock);
+			continue;
+		}
+
+		factor = btrfs_bg_type_to_factor(block_group->flags);
+		free_bytes += (block_group->length -
+			       block_group->used) * factor;
+
+		spin_unlock(&block_group->lock);
+	}
+	spin_unlock(&sinfo->lock);
+
+	return free_bytes;
+}

fs/btrfs/space-info.h

@@ -236,5 +236,6 @@ 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);
 
 #endif /* BTRFS_SPACE_INFO_H */