[ndctl PATCH v4 6/7] ndctl/namespace: Continue region search on 'missing seed' event

[Dan Williams <dan.j.williams@intel.com>]

Consider a scenario where one region is in an error state but another is
not:

    # ndctl list -Ru
    [
      {
        "dev":"region3",
        "size":"127.00 GiB (136.37 GB)",
        "available_size":0,
        "max_available_extent":0,
        "type":"pmem",
        "persistence_domain":"unknown"
      },
      {
        "dev":"region2",
        "size":"127.00 GiB (136.37 GB)",
        "available_size":"127.00 GiB (136.37 GB)",
        "max_available_extent":"127.00 GiB (136.37 GB)",
        "type":"pmem",
        "iset_id":"0xba90120012b4dc",
        "persistence_domain":"unknown"
      }
    ]

    # ndctl create-namespace -m devdax -v
    [..]
    namespace_create:887: region3: no idle namespace seed
    failed to create namespace: No such device

Instead of failing when probing region3 for capacity, fallback to
region2.

    # ndctl create-namespace -m devdax
    {
      "dev":"namespace2.0",
      "mode":"devdax",
      "map":"dev",
      "size":"125.01 GiB (134.23 GB)",
      "uuid":"c3fa7d2f-6c20-4762-9aa8-627d06275e03",
      "daxregion":{
        "id":2,
        "size":"125.01 GiB (134.23 GB)",
        "align":2097152,
        "devices":[
          {
            "chardev":"dax2.0",
            "size":"125.01 GiB (134.23 GB)"
          }
        ]
      },
      "align":2097152
    }

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
 ndctl/namespace.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/ndctl/namespace.c b/ndctl/namespace.c
index 26d03358c80d..5c457224cb13 100644
--- a/ndctl/namespace.c
+++ b/ndctl/namespace.c
@@ -811,7 +811,7 @@ static int namespace_create(struct ndctl_region *region)
 	if (!ndns || is_namespace_active(ndns)) {
 		debug("%s: no %s namespace seed\n", devname,
 				ndns ? "idle" : "available");
-		return -ENODEV;
+		return -EAGAIN;
 	}
 
 	rc = setup_namespace(region, ndns, &p);

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