drbd: debugfs: add per volume oldest_requests

Show oldest requests
 * pending master bio completion and,
 * if different, local disk bio completion.

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>

1 files changed, 12 insertions, 9 deletions

diff --git a/lib/lru_cache.c b/lib/lru_cache.c
index 6111cd1..852c81e 100644
--- a/lib/lru_cache.c
+++ b/lib/lru_cache.c
@@ -643,9 +643,10 @@ void lc_set(struct lru_cache *lc, unsigned int enr, int index)
  * lc_dump - Dump a complete LRU cache to seq in textual form.
  * @lc: the lru cache to operate on
  * @seq: the &struct seq_file pointer to seq_printf into
- * @utext: user supplied "heading" or other info
+ * @utext: user supplied additional "heading" or other info
  * @detail: function pointer the user may provide to dump further details
- * of the object the lc_element is embedded in.
+ * of the object the lc_element is embedded in. May be NULL.
+ * Note: a leading space ' ' and trailing newline '\n' is implied.
  */
 void lc_seq_dump_details(struct seq_file *seq, struct lru_cache *lc, char *utext,
 	     void (*detail) (struct seq_file *, struct lc_element *))
@@ -654,16 +655,18 @@ void lc_seq_dump_details(struct seq_file *seq, struct lru_cache *lc, char *utext
 	struct lc_element *e;
 	int i;
 
-	seq_printf(seq, "\tnn: lc_number refcnt %s\n ", utext);
+	seq_printf(seq, "\tnn: lc_number (new nr) refcnt %s\n ", utext);
 	for (i = 0; i < nr_elements; i++) {
 		e = lc_element_by_index(lc, i);
-		if (e->lc_number == LC_FREE) {
-			seq_printf(seq, "\t%2d: FREE\n", i);
-		} else {
-			seq_printf(seq, "\t%2d: %4u %4u    ", i,
-				   e->lc_number, e->refcnt);
+		if (e->lc_number != e->lc_new_number)
+			seq_printf(seq, "\t%5d: %6d %8d %6d ",
+				i, e->lc_number, e->lc_new_number, e->refcnt);
+		else
+			seq_printf(seq, "\t%5d: %6d %-8s %6d ",
+				i, e->lc_number, "-\"-", e->refcnt);
+		if (detail)
 			detail(seq, e);
-		}
+		seq_putc(seq, '\n');
 	}
 }