[dm-devel] [PATCH v3 4/4] dm dust: introduce listbadblocks in the rst

[yangerkun]

Since we support the listbadblocks command, introduce the detail in the
doc.

Signed-off-by: yangerkun <yangerkun at huawei.com>
---
 .../admin-guide/device-mapper/dm-dust.rst        | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/Documentation/admin-guide/device-mapper/dm-dust.rst b/Documentation/admin-guide/device-mapper/dm-dust.rst
index 84149c08b68f..5c66a71e3442 100644
--- a/Documentation/admin-guide/device-mapper/dm-dust.rst
+++ b/Documentation/admin-guide/device-mapper/dm-dust.rst
@@ -205,6 +205,21 @@ If there were no bad blocks to clear, the following message will
 appear::
 
         no badblocks found
+Listing the bad block list
+--------------------------
+
+To list all bad blocks in the bad block list(using an example device
+with blocks 1 and 2 in the bad block list),run the following message
+command::
+
+        $ sudo dmsetup message dust1 0 listbadblocks
+        1
+        2
+
+No bad block exists, same message will get following report::
+
+        $ sudo dmsetup message dust1 0 listbadblocks
+        null
 
 Message commands list
 ---------------------
@@ -224,6 +239,7 @@ Single argument message commands::
 
         countbadblocks
         clearbadblocks
+        listbadblocks
         disable
         enable
         quiet
-- 
2.25.4