try_to_free_disk_space(): Explain what is going on.

This adds a comment which explains the conditions that must be
satisfied to get to this point in the function.

1 files changed, 4 insertions, 0 deletions

diff --git a/dss.c b/dss.c
index 07a6042..979ff13 100644
--- a/dss.c
+++ b/dss.c
@@ -606,6 +606,10 @@ static int try_to_free_disk_space(void)
 		if (next_snapshot_is_due())
 			return 0;
 	}
+	/*
+	 * Idle and --keep_redundant not given, or low disk space. Look at
+	 * existing snapshots.
+	 */
 	dss_get_snapshot_list(&sl);
 	ret = 0;
 	if (!low_disk_space && sl.num_snapshots <= 1)