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: NChao Yu <yuchao0@huawei.com>
Signed-off-by: NJaegeuk 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);
 

fs/f2fs/sysfs.c

@@ -178,8 +178,13 @@ static ssize_t f2fs_sbi_store(struct f2fs_attr *a,
 	if (!strcmp(a->attr.name, "iostat_enable") && *ui == 0)
 		f2fs_reset_iostat(sbi);
 	if (!strcmp(a->attr.name, "gc_urgent") && t == 1 && sbi->gc_thread) {
+		struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
+
 		sbi->gc_thread->gc_wake = 1;
 		wake_up_interruptible_all(&sbi->gc_thread->gc_wait_queue_head);
+
+		dcc->discard_wake = 1;
+		wake_up_interruptible_all(&dcc->discard_wait_queue);
 	}
 
 	return count;