f2fs: issue discard commands if gc_urgent is set

It's time to issue all the discard commands, if user sets the idle time.

Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

fs/f2fs/segment.c

@@ -21,6 +21,7 @@
 #include "f2fs.h"
 #include "segment.h"
 #include "node.h"
+#include "gc.h"
 #include "trace.h"
 #include <trace/events/f2fs.h>
 
@@ -1194,8 +1195,11 @@ static int issue_discard_thread(void *data)
 		if (kthread_should_stop())
 			return 0;
 
-		if (dcc->discard_wake)
+		if (dcc->discard_wake) {
 			dcc->discard_wake = 0;
+			if (sbi->gc_thread && sbi->gc_thread->gc_urgent)
+				mark_discard_range_all(sbi);
+		}
 
 		sb_start_intwrite(sbi->sb);