From fb13dfb8d84c4f0a749665c8f07179450b199f3e Mon Sep 17 00:00:00 2001
From: Jeff Moyer <jmoyer@redhat.com>
Date: Tue, 9 Feb 2021 16:51:53 -0500
Subject: [PATCH] zero_info_block: skip seed devices

Currently, ndctl destroy-namespace -f all will output errors of the
form:

  Error: destroy namespace: namespace0.0 failed to enable for zeroing, continuing

for any zero-sized namespace.  That particular namespace looks like this:

  {
    "dev":"namespace0.0",
    "mode":"raw",
    "size":0,
    "uuid":"00000000-0000-0000-0000-000000000000",
    "sector_size":512,
    "state":"disabled"
  }

This patch skips over namespaces with size=0 when zeroing out info
blocks.

Fixes: 46654c2d60b70 ("ndctl/namespace: Always zero info-blocks")
Reported-by: Zhang Yi <yizhan@redhat.com>
Signed-off-by: Jeff Moyer <jmoyer@redhat.com>
Signed-off-by: Vishal Verma <vishal.l.verma@intel.com>
Link: https://lore.kernel.org/r/x49r1lohpty.fsf@segfault.boston.devel.redhat.com
---
 ndctl/namespace.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/ndctl/namespace.c b/ndctl/namespace.c
index 1feb74d..1e8a2cd 100644
--- a/ndctl/namespace.c
+++ b/ndctl/namespace.c
@@ -1052,6 +1052,9 @@ static int zero_info_block(struct ndctl_namespace *ndns)
 	void *buf = NULL, *read_buf = NULL;
 	char path[50];
 
+	if (ndctl_namespace_get_size(ndns) == 0)
+		return 1;
+
 	ndctl_namespace_set_raw_mode(ndns, 1);
 	rc = ndctl_namespace_enable(ndns);
 	if (rc < 0) {
-- 
2.37.0.windows.1