[RFC 1/2] dm dust: add interface to list all badblocks

[yangerkun <yangerkun@xxxxxxxxxx>]

This interface may help anyone want to know all badblocks without query
block one by one.

Signed-off-by: yangerkun <yangerkun@xxxxxxxxxx>
---
 drivers/md/dm-dust.c | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/drivers/md/dm-dust.c b/drivers/md/dm-dust.c
index ff03b90072c5..903c0d158c6e 100644
--- a/drivers/md/dm-dust.c
+++ b/drivers/md/dm-dust.c
@@ -280,6 +280,24 @@ static int dust_clear_badblocks(struct dust_device *dd)
 	return 0;
 }
 
+static void dust_list_badblocks(struct dust_device *dd)
+{
+	unsigned long flags;
+	struct rb_root badblocklist;
+	struct rb_node *node;
+	struct badblock *bblk;
+
+	DMINFO("%s: badblocks list as below:", __func__);
+	spin_lock_irqsave(&dd->dust_lock, flags);
+	badblocklist = dd->badblocklist;
+	for (node = rb_first(&badblocklist); node; node = rb_next(node)) {
+		bblk = rb_entry(node, struct badblock, node);
+		DMINFO("bad block: %llu", bblk->bb);
+	}
+	spin_unlock_irqrestore(&dd->dust_lock, flags);
+	DMINFO("%s: badblocks list end.", __func__);
+}
+
 /*
  * Target parameters:
  *
@@ -422,6 +440,9 @@ static int dust_message(struct dm_target *ti, unsigned int argc, char **argv,
 			else
 				dd->quiet_mode = false;
 			r = 0;
+		} else if (!strcasecmp(argv[0], "listbadblocks")) {
+			dust_list_badblocks(dd);
+			r = 0;
 		} else {
 			invalid_msg = true;
 		}
-- 
2.25.4


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