libnvdimm, namespace: do not delete namespace-id 0

Given that the naming of pmem devices changes from the pmemX form to the
pmemX.Y form when namespace id is greater than 0, arrange for namespaces
with id-0 to be exempt from deletion. Otherwise a simple reconfiguration
of an existing namespace to a new mode results in a name change of the
resulting block device:

    # ndctl list --namespace=namespace1.0
    {
      "dev":"namespace1.0",
      "mode":"raw",
      "size":2147483648,
      "uuid":"3dadf3dc-89b9-4b24-b20e-abc8a4707ce3",
      "blockdev":"pmem1"
    }

    # ndctl create-namespace --reconfig=namespace1.0 --mode=memory --force
    {
      "dev":"namespace1.1",
      "mode":"memory",
      "size":2111832064,
      "uuid":"7b4a6341-7318-4219-a02c-fb57c0bbf613",
      "blockdev":"pmem1.1"
    }

This change does require tooling changes to explicitly look for
namespaceX.0 if the seed has already advanced to another namespace.

Cc: <stable@vger.kernel.org>
Fixes: 98a29c39dc68 ("libnvdimm, namespace: allow creation of multiple pmem-namespaces per region")
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

1 files changed, 7 insertions, 4 deletions

diff --git a/drivers/nvdimm/namespace_devs.c b/drivers/nvdimm/namespace_devs.c
index eda027db0918..ce3e8dfa10ad 100644
--- a/drivers/nvdimm/namespace_devs.c
+++ b/drivers/nvdimm/namespace_devs.c
@@ -962,8 +962,8 @@ static ssize_t __size_store(struct device *dev, unsigned long long val)
         struct nvdimm_drvdata *ndd;
         struct nd_label_id label_id;
         u32 flags = 0, remainder;
+        int rc, i, id = -1;
         u8 *uuid = NULL;
-        int rc, i;
 
         if (dev->driver || ndns->claim)
                 return -EBUSY;
@@ -972,11 +972,13 @@ static ssize_t __size_store(struct device *dev, unsigned long long val)
                 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
 
                 uuid = nspm->uuid;
+                id = nspm->id;
         } else if (is_namespace_blk(dev)) {
                 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
 
                 uuid = nsblk->uuid;
                 flags = NSLABEL_FLAG_LOCAL;
+                id = nsblk->id;
         }
 
         /*
@@ -1039,10 +1041,11 @@ static ssize_t __size_store(struct device *dev, unsigned long long val)
 
         /*
          * Try to delete the namespace if we deleted all of its
-         * allocation, this is not the seed device for the region, and
-         * it is not actively claimed by a btt instance.
+         * allocation, this is not the seed or 0th device for the
+         * region, and it is not actively claimed by a btt, pfn, or dax
+         * instance.
          */
-        if (val == 0 && nd_region->ns_seed != dev && !ndns->claim)
+        if (val == 0 && id != 0 && nd_region->ns_seed != dev && !ndns->claim)
                 nd_device_unregister(dev, ND_ASYNC);
 
         return rc;