Introduce btr_node_status() and add btr support to the file writer.

[paraslash.git] / buffer_tree.c

diff --git a/buffer_tree.c b/buffer_tree.c
index c826e8fa26a97c9036595ddf188bb984a7b4ec4e..3b00154183d9c19ba0e4895c6fcdec2e03010a96 100644 (file)
--- 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);
 }
 {
        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;
+}