Commit 1e687220 authored by Keith Busch's avatar Keith Busch Committed by Dave Jiang

libnvdimm: Export max available extent

The 'available_size' attribute showing the combined total of all
unallocated space isn't always useful to know how large of a namespace
a user may be able to allocate if the region is fragmented. This patch
will export the largest extent of unallocated space that may be allocated
to create a new namespace.
Signed-off-by: default avatarKeith Busch <keith.busch@intel.com>
Reviewed-by: default avatarVishal Verma <vishal.l.verma@intel.com>
Signed-off-by: default avatarDave Jiang <dave.jiang@intel.com>
parent 12e3129e
...@@ -434,6 +434,21 @@ static ssize_t available_size_show(struct device *dev, ...@@ -434,6 +434,21 @@ static ssize_t available_size_show(struct device *dev,
} }
static DEVICE_ATTR_RO(available_size); static DEVICE_ATTR_RO(available_size);
static ssize_t max_available_extent_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct nd_region *nd_region = to_nd_region(dev);
unsigned long long available = 0;
nvdimm_bus_lock(dev);
wait_nvdimm_bus_probe_idle(dev);
available = nd_region_allocatable_dpa(nd_region);
nvdimm_bus_unlock(dev);
return sprintf(buf, "%llu\n", available);
}
static DEVICE_ATTR_RO(max_available_extent);
static ssize_t init_namespaces_show(struct device *dev, static ssize_t init_namespaces_show(struct device *dev,
struct device_attribute *attr, char *buf) struct device_attribute *attr, char *buf)
{ {
...@@ -585,6 +600,7 @@ static struct attribute *nd_region_attributes[] = { ...@@ -585,6 +600,7 @@ static struct attribute *nd_region_attributes[] = {
&dev_attr_read_only.attr, &dev_attr_read_only.attr,
&dev_attr_set_cookie.attr, &dev_attr_set_cookie.attr,
&dev_attr_available_size.attr, &dev_attr_available_size.attr,
&dev_attr_max_available_extent.attr,
&dev_attr_namespace_seed.attr, &dev_attr_namespace_seed.attr,
&dev_attr_init_namespaces.attr, &dev_attr_init_namespaces.attr,
&dev_attr_badblocks.attr, &dev_attr_badblocks.attr,
......
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