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path: root/drivers/nvdimm/dimm_devs.c
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Diffstat (limited to 'drivers/nvdimm/dimm_devs.c')
-rw-r--r--drivers/nvdimm/dimm_devs.c25
1 files changed, 25 insertions, 0 deletions
diff --git a/drivers/nvdimm/dimm_devs.c b/drivers/nvdimm/dimm_devs.c
index 156d518..83b179e 100644
--- a/drivers/nvdimm/dimm_devs.c
+++ b/drivers/nvdimm/dimm_devs.c
@@ -19,6 +19,7 @@
#include <linux/fs.h>
#include <linux/mm.h>
#include "nd-core.h"
+#include "label.h"
#include "nd.h"
static DEFINE_IDA(dimm_ida);
@@ -296,9 +297,33 @@ static ssize_t state_show(struct device *dev, struct device_attribute *attr,
}
static DEVICE_ATTR_RO(state);
+static ssize_t available_slots_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct nvdimm_drvdata *ndd = dev_get_drvdata(dev);
+ ssize_t rc;
+ u32 nfree;
+
+ if (!ndd)
+ return -ENXIO;
+
+ nvdimm_bus_lock(dev);
+ nfree = nd_label_nfree(ndd);
+ if (nfree - 1 > nfree) {
+ dev_WARN_ONCE(dev, 1, "we ate our last label?\n");
+ nfree = 0;
+ } else
+ nfree--;
+ rc = sprintf(buf, "%d\n", nfree);
+ nvdimm_bus_unlock(dev);
+ return rc;
+}
+static DEVICE_ATTR_RO(available_slots);
+
static struct attribute *nvdimm_attributes[] = {
&dev_attr_state.attr,
&dev_attr_commands.attr,
+ &dev_attr_available_slots.attr,
NULL,
};