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Message-ID: <147585833727.22349.4151646734474522098.stgit@dwillia2-desk3.amr.corp.intel.com>
Date: Fri, 07 Oct 2016 09:38:57 -0700
From: Dan Williams <dan.j.williams@...el.com>
To: linux-nvdimm@...ts.01.org
Cc: linux-kernel@...r.kernel.org
Subject: [PATCH 03/14] libnvdimm,
namespace: refactor uuid_show() into a namespace_to_uuid() helper
The ability to translate a generic struct device pointer into a
namespace uuid is a useful utility as we go to unify the blk and pmem
label scanning paths.
Signed-off-by: Dan Williams <dan.j.williams@...el.com>
---
drivers/nvdimm/namespace_devs.c | 19 ++++++++++++-------
1 file changed, 12 insertions(+), 7 deletions(-)
diff --git a/drivers/nvdimm/namespace_devs.c b/drivers/nvdimm/namespace_devs.c
index 9f4188c78120..0e62f46755e7 100644
--- a/drivers/nvdimm/namespace_devs.c
+++ b/drivers/nvdimm/namespace_devs.c
@@ -1032,22 +1032,27 @@ static ssize_t size_show(struct device *dev,
}
static DEVICE_ATTR(size, S_IRUGO, size_show, size_store);
-static ssize_t uuid_show(struct device *dev,
- struct device_attribute *attr, char *buf)
+static u8 *namespace_to_uuid(struct device *dev)
{
- u8 *uuid;
-
if (is_namespace_pmem(dev)) {
struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
- uuid = nspm->uuid;
+ return nspm->uuid;
} else if (is_namespace_blk(dev)) {
struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
- uuid = nsblk->uuid;
+ return nsblk->uuid;
} else
- return -ENXIO;
+ return ERR_PTR(-ENXIO);
+}
+
+static ssize_t uuid_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ u8 *uuid = namespace_to_uuid(dev);
+ if (IS_ERR(uuid))
+ return PTR_ERR(uuid);
if (uuid)
return sprintf(buf, "%pUb\n", uuid);
return sprintf(buf, "\n");
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