X-Git-Url: http://git.tuebingen.mpg.de/?p=paraslash.git;a=blobdiff_plain;f=buffer_tree.c;h=3b00154183d9c19ba0e4895c6fcdec2e03010a96;hp=c826e8fa26a97c9036595ddf188bb984a7b4ec4e;hb=d0f36435b0f81368a778fda33f3a7df86830f5ac;hpb=015055963d095abd0e153832f5b3f0fda3ac8306

diff --git a/buffer_tree.c b/buffer_tree.c
index c826e8fa..3b001541 100644
--- a/buffer_tree.c
+++ b/buffer_tree.c
@@ -404,3 +404,22 @@ void btr_log_tree(struct btr_node *btrn, int loglevel)
 {
 	return log_tree_recursively(btrn, loglevel, 0);
 }
+
+/** 640K ought to be enough for everybody ;) */
+#define BTRN_MAX_PENDING (640 * 1024)
+
+int btr_node_status(struct btr_node *btrn, size_t min_iqs)
+{
+	size_t iqs;
+
+	if (btr_eof(btrn))
+		return -E_BTR_EOF;
+	if (btr_bytes_pending(btrn) > BTRN_MAX_PENDING)
+		return 0;
+	iqs = btr_get_input_queue_size(btrn);
+	if (iqs == 0) /* we have a parent, because not eof */
+		return 0;
+	if (iqs < min_iqs && !btr_no_parent(btrn))
+		return 0;
+	return 1;
+}