Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

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

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

drivers/nvdimm/region_devs.c

+16 −0
Original line number Diff line number Diff line
@@ -434,6 +434,21 @@ static ssize_t available_size_show(struct device *dev, 
}

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,

		struct device_attribute *attr, char *buf)

{
@@ -585,6 +600,7 @@ static struct attribute *nd_region_attributes[] = { 
	&dev_attr_read_only.attr,

	&dev_attr_set_cookie.attr,

	&dev_attr_available_size.attr,

	&dev_attr_max_available_extent.attr,

	&dev_attr_namespace_seed.attr,

	&dev_attr_init_namespaces.attr,

	&dev_attr_badblocks.attr,