Merge pull request #21945 from rhvgoyal/export-min-free-space

Export Mininum Thin Pool Free Space through docker info

daemon/graphdriver/devmapper/deviceset.go

@@ -167,6 +167,7 @@ type Status struct {
 	// thin pool and it can't be activated again.
 	DeferredDeleteEnabled      bool
 	DeferredDeletedDeviceCount uint
+	MinFreeSpace               uint64
 }
 
 // Structure used to export image/container metadata in docker inspect.
@@ -2469,6 +2470,9 @@ func (devices *DeviceSet) Status() *Status {
 				status.Metadata.Available = actualSpace
 			}
 		}
+
+		minFreeData := (dataTotal * uint64(devices.minFreeSpacePercent)) / 100
+		status.MinFreeSpace = minFreeData * blockSizeInSectors * 512
 	}
 
 	return status

daemon/graphdriver/devmapper/driver.go

@@ -76,6 +76,7 @@ func (d *Driver) Status() [][2]string {
 		{"Metadata Space Used", fmt.Sprintf("%s", units.HumanSize(float64(s.Metadata.Used)))},
 		{"Metadata Space Total", fmt.Sprintf("%s", units.HumanSize(float64(s.Metadata.Total)))},
 		{"Metadata Space Available", fmt.Sprintf("%s", units.HumanSize(float64(s.Metadata.Available)))},
+		{"Thin Pool Minimum Free Space", fmt.Sprintf("%s", units.HumanSize(float64(s.MinFreeSpace)))},
 		{"Udev Sync Supported", fmt.Sprintf("%v", s.UdevSyncSupported)},
 		{"Deferred Removal Enabled", fmt.Sprintf("%v", s.DeferredRemoveEnabled)},
 		{"Deferred Deletion Enabled", fmt.Sprintf("%v", s.DeferredDeleteEnabled)},

docs/userguide/storagedriver/selectadriver.md

@@ -109,6 +109,7 @@ The following command shows how to start the Docker daemon with the
      Metadata Space Used: 1.479 MB
      Metadata Space Total: 2.147 GB
      Metadata Space Available: 2.146 GB
+     Thin Pool Minimum Free Space: 10.74 GB
      Udev Sync Supported: true
      Deferred Removal Enabled: false
      Data loop file: /var/lib/docker/devicemapper/devicemapper/data