linux-kernel - [PATCH 09/14] libnvdimm, namespace: expand pmem device naming scheme for multi-pmem

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Date:   Fri, 07 Oct 2016 09:39:29 -0700
From:   Dan Williams <dan.j.williams@...el.com>
To:     linux-nvdimm@...ts.01.org
Cc:     linux-kernel@...r.kernel.org
Subject: [PATCH 09/14] libnvdimm,
 namespace: expand pmem device naming scheme for multi-pmem

pmem devices are currently named /dev/pmem<region-index>. Preserve the
naming of the 0th device, but add a ".<namespace-index>" for other
devices.

Signed-off-by: Dan Williams <dan.j.williams@...el.com>
---
 drivers/nvdimm/namespace_devs.c |   16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/drivers/nvdimm/namespace_devs.c b/drivers/nvdimm/namespace_devs.c
index f0536c2789e9..132c5b8b5366 100644
--- a/drivers/nvdimm/namespace_devs.c
+++ b/drivers/nvdimm/namespace_devs.c
@@ -173,7 +173,21 @@ const char *nvdimm_namespace_disk_name(struct nd_namespace_common *ndns,
 		suffix = "s";
 
 	if (is_namespace_pmem(&ndns->dev) || is_namespace_io(&ndns->dev)) {
-		sprintf(name, "pmem%d%s", nd_region->id, suffix ? suffix : "");
+		int nsidx = 0;
+
+		if (is_namespace_pmem(&ndns->dev)) {
+			struct nd_namespace_pmem *nspm;
+
+			nspm = to_nd_namespace_pmem(&ndns->dev);
+			nsidx = nspm->id;
+		}
+
+		if (nsidx)
+			sprintf(name, "pmem%d.%d%s", nd_region->id, nsidx,
+					suffix ? suffix : "");
+		else
+			sprintf(name, "pmem%d%s", nd_region->id,
+					suffix ? suffix : "");
 	} else if (is_namespace_blk(&ndns->dev)) {
 		struct nd_namespace_blk *nsblk;