fix monitor disk used space underreported for spun-down disks

Unraid API returns fsUsed=0 when a disk's filesystem is unmounted (spun
down). disks.ini keeps the last-known value in KB even after spindown —
use it as fallback when isSpinning=false and fsUsed=0. Also remove the
mounted-only guard in the ini fallback path (vv_disk_entry) for the same
reason. Stale comments in user_script_plug-in.sh and partnership_manager.sh
also cleaned up.

Plugin/unraid/include/common.php

@@ -345,7 +345,7 @@ function vv_disk_entry(array $d, string $key, string $role = 'data'): ?array {
     $mounted   = ($d['fsStatus'] ?? '') === 'Mounted';
     // Parity has no filesystem — use raw size only
     $size_kb   = (int)($isParity ? ($d['size'] ?? 0) : ($mounted ? ($d['fsSize'] ?? 0) : ($d['size'] ?? 0)));
-    $used_kb   = (int)($isParity ? 0             : ($mounted ? ($d['fsUsed'] ?? 0) : 0));
+    $used_kb   = (int)($isParity ? 0 : ($d['fsUsed'] ?? 0));
     if ($size_kb <= 0) return null;
     $tempRaw   = trim($d['temp'] ?? '');
     return [
@@ -472,13 +472,27 @@ function vv_parity_status(): array {
     ];
 }
 
+// Returns a map of disk name → fsUsed in KB from disks.ini.
+// Unraid keeps this updated even after spindown, so it's the authoritative source
+// for used space when the API reports 0 because the filesystem is unmounted.
+function _vv_ini_used_kb(): array {
+    $ini = @parse_ini_file('/var/local/emhttp/disks.ini', true) ?: [];
+    $out = [];
+    foreach ($ini as $key => $d) {
+        $name = $d['name'] ?? $key;
+        $out[$name] = (int)($d['fsUsed'] ?? 0);
+    }
+    return $out;
+}
+
 function vv_storage_pools(): array {
     // ── API path ──────────────────────────────────────────────────────────────
     $api = vv_api_data();
     if ($api && isset($api['array']['caches'])) {
+        $ini_used = _vv_ini_used_kb();
         $out = [];
         foreach ($api['array']['caches'] as $d) {
-            $entry = vv_api_disk_entry($d, 'data');
+            $entry = vv_api_disk_entry($d, 'data', $ini_used[$d['name'] ?? ''] ?? 0);
             if ($entry) $out[] = $entry;
         }
         if (!empty($out)) {
@@ -505,6 +519,7 @@ function vv_array_disks(): array {
     // ── API path ──────────────────────────────────────────────────────────────
     $api = vv_api_data();
     if ($api && (isset($api['array']['parities']) || isset($api['array']['disks']))) {
+        $ini_used = _vv_ini_used_kb();
         $parity = [];
         $data   = [];
         foreach ($api['array']['parities'] ?? [] as $d) {
@@ -512,7 +527,7 @@ function vv_array_disks(): array {
             if ($entry) $parity[] = $entry;
         }
         foreach ($api['array']['disks'] ?? [] as $d) {
-            $entry = vv_api_disk_entry($d, 'data');
+            $entry = vv_api_disk_entry($d, 'data', $ini_used[$d['name'] ?? ''] ?? 0);
             if ($entry) $data[] = $entry;
         }
         if (!empty($parity) || !empty($data)) {

Plugin/unraid/include/unraid_api.php

@@ -111,7 +111,9 @@ function _vv_api_disk_role(string $type): string {
 
 // Build a normalised disk entry from API data, matching the shape vv_disk_entry() produces.
 // $role may be overridden; if empty it is derived from the disk's type field.
-function vv_api_disk_entry(array $d, string $role = ''): ?array {
+// $ini_used_kb: last-known fsUsed in KB from disks.ini — used when the disk is
+// spun down and the API returns fsUsed=0 because the filesystem is unmounted.
+function vv_api_disk_entry(array $d, string $role = '', int $ini_used_kb = 0): ?array {
     if (!$role) $role = _vv_api_disk_role((string)($d['type'] ?? 'DATA'));
 
     if ($role === 'parity') {
@@ -127,7 +129,13 @@ function vv_api_disk_entry(array $d, string $role = ''): ?array {
         if ($sizeRaw <= 0) return null;
         $usedRaw = (float)($d['fsUsed'] ?? 0);
         $sizeGb  = _vv_api_bytes_to_gb($sizeRaw);
-        $usedGb  = _vv_api_bytes_to_gb($usedRaw);
+        if ($usedRaw > 0.0) {
+            $usedGb = _vv_api_bytes_to_gb($usedRaw);
+        } elseif (!($d['isSpinning'] ?? true) && $ini_used_kb > 0) {
+            $usedGb = round($ini_used_kb / 1048576, 1);
+        } else {
+            $usedGb = 0.0;
+        }
         $pct     = $sizeGb > 0 ? round($usedGb / $sizeGb * 100, 1) : null;
     }