'available' field in rrd data in the API and change usage of 'total'

The API now exposes the field 'available' as well, with which the
unprivileged total is calculated in all corresponsing views in the
frontend.
The rrd charts now also display the total as the unprivileged total
if available, otherwise the absolute total is used.

Signed-off-by: Daniel Tschlatscher <d.tschlatscher@proxmox.com>

src/api2/admin/datastore.rs

@@ -1804,6 +1804,7 @@ pub fn get_rrd_stats(
 
     let mut rrd_fields = vec![
         "total",
+        "available",
         "used",
         "read_ios",
         "read_bytes",

www/dashboard/DataStoreStatistics.js

@@ -3,7 +3,12 @@ Ext.define('pbs-datastore-statistics', {
 
     fields: [
 	'store',
-	'total',
+	{
+	    name: 'total',
+	    calculate: function(data) {
+		return data.avail + data.used;
+	    },
+	},
 	'used',
 	'avail',
 	'estimated-full-date',

www/datastore/DataStoreListSummary.js

@@ -52,10 +52,11 @@ Ext.define('PBS.datastore.DataStoreListSummary', {
 	    vm.set('maintenance', '');
 	}
 
-	let usage = statusData.used/statusData.total;
+	let total = statusData.avail + statusData.used;
+	let usage = statusData.used / total;
 	let usagetext = Ext.String.format(gettext('{0} of {1}'),
 	    Proxmox.Utils.format_size(statusData.used, true),
-	    Proxmox.Utils.format_size(statusData.total, true),
+	    Proxmox.Utils.format_size(total, true),
 	);
 
 	let usagePanel = me.lookup('usage');

www/datastore/Summary.js

@@ -3,6 +3,20 @@ Ext.define('pve-rrd-datastore', {
     fields: [
 	'used',
 	'total',
+	{
+	    name: 'unpriv-total', // Can't resuse 'total' here as that creates a stack overflow
+	    calculate: function(data) {
+		let used = data.used;
+		let avail = data.available;
+
+		if (avail && used) {
+		    return avail + used;
+		}
+
+		return data.total;
+	    },
+	},
+	'available',
 	'read_ios',
 	'read_bytes',
 	'write_ios',
@@ -66,8 +80,8 @@ Ext.define('PBS.DataStoreInfo', {
 	    let vm = me.getViewModel();
 
 	    let counts = store.getById('counts').data.value;
-	    let total = store.getById('total').data.value;
 	    let used = store.getById('used').data.value;
+	    let total = store.getById('avail').data.value + used;
 
 	    let usage = Proxmox.Utils.render_size_usage(used, total, true);
 	    vm.set('usagetext', usage);
@@ -236,7 +250,7 @@ Ext.define('PBS.DataStoreSummary', {
 	{
 	    xtype: 'proxmoxRRDChart',
 	    title: gettext('Storage usage (bytes)'),
-	    fields: ['total', 'used'],
+	    fields: ['unpriv-total', 'used'],
 	    fieldTitles: [gettext('Total'), gettext('Storage usage')],
 	},
 	{