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| author | Dan Williams <dan.j.williams@intel.com> | 2016-09-21 18:16:21 -0700 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2016-10-05 20:24:18 -0700 |
| commit | f95b4bca9e7d29db284f9b175edf8deca1489def (patch) | |
| tree | dfe75bf0ef883c9c84ececaf336cb16972c19449 /drivers/nvdimm | |
| parent | ae8219f186d8e98a3239afc6ea49bb46f2871d2f (diff) | |
| download | linux-f95b4bca9e7d29db284f9b175edf8deca1489def.tar.bz2 | |
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@intel.com>
Diffstat (limited to 'drivers/nvdimm')
| -rw-r--r-- | drivers/nvdimm/namespace_devs.c | 19 |
1 files 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"); |