[PATCH v3 3/4] dm dust: add interface to list all badblocks

[yangerkun <yangerkun@xxxxxxxxxx>]

This interface may help anyone who want to know all badblocks without
query block for each.

Signed-off-by: yangerkun <yangerkun@xxxxxxxxxx>
---
 drivers/md/dm-dust.c | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/drivers/md/dm-dust.c b/drivers/md/dm-dust.c
index a0c75c104de0..2ad8fc9293e0 100644
--- a/drivers/md/dm-dust.c
+++ b/drivers/md/dm-dust.c
@@ -284,6 +284,31 @@ static int dust_clear_badblocks(struct dust_device *dd, char *result, unsigned i
 	return 1;
 }
 
+static int dust_list_badblocks(struct dust_device *dd, char *result, unsigned int maxlen,
+				unsigned int *sz_ptr)
+{
+	unsigned long flags;
+	struct rb_root badblocklist;
+	struct rb_node *node;
+	struct badblock *bblk;
+	unsigned int sz = *sz_ptr;
+	unsigned long long num = 0;
+
+	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);
+		DMEMIT("%llu\n", bblk->bb);
+		num++;
+	}
+
+	spin_unlock_irqrestore(&dd->dust_lock, flags);
+	if (!num)
+		DMEMIT("null");
+
+	return 1;
+}
+
 /*
  * Target parameters:
  *
@@ -427,6 +452,8 @@ 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")) {
+			r = dust_list_badblocks(dd, result, maxlen, &sz);
 		} else {
 			invalid_msg = true;
 		}
-- 
2.25.4


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