path: root/drivers/nvdimm
diff options
authorKeith Busch <keith.busch@intel.com>2018-07-24 15:07:58 -0600
committerDave Jiang <dave.jiang@intel.com>2018-07-25 14:11:43 -0700
commit1e687220ef2d95a582e13d8de79932bfe32fdfa8 (patch)
treef3e15d37cff8ebc26e86a679938f4a4f276b47cb /drivers/nvdimm
parent12e3129e29b406c41bc89231092a20d79dbf802c (diff)
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: Keith Busch <keith.busch@intel.com> Reviewed-by: Vishal Verma <vishal.l.verma@intel.com> Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Diffstat (limited to 'drivers/nvdimm')
1 files changed, 16 insertions, 0 deletions
diff --git a/drivers/nvdimm/region_devs.c b/drivers/nvdimm/region_devs.c
index c30d5af02cc2..fa37afcd43ff 100644
--- a/drivers/nvdimm/region_devs.c
+++ b/drivers/nvdimm/region_devs.c
@@ -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_max_available_extent.attr,

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