Remove the cap of max disk resize.

Instead, get the max resize from the available storage
from the host. Give 1GB additional room to the host.

Test: Check if resize option is available on guest based on host available storage.

Bug: 405398527
Test: Resize storage - Increase by 10G, followed by decrease by 5G
Change-Id: I201749302f4f31c4f345c69eb47444d6bdd0b54c
Signed-off-by: Akilesh Kailash <[email protected]>

Author: Akilesh Kailash

android/TerminalApp/java/com/android/virtualization/terminal/SettingsDiskResizeActivity.kt

@@ -15,13 +15,15 @@
  */
 package com.android.virtualization.terminal
 
+import android.content.Context
 import android.content.Intent
 import android.icu.text.MeasureFormat
 import android.icu.text.NumberFormat
 import android.icu.util.Measure
 import android.icu.util.MeasureUnit
 import android.os.Bundle
-import android.os.Environment
+import android.os.storage.StorageManager
+import android.os.storage.StorageManager.UUID_DEFAULT
 import android.text.SpannableString
 import android.text.Spanned
 import android.text.TextUtils
@@ -39,7 +41,7 @@ import java.util.regex.Pattern
 
 class SettingsDiskResizeActivity : AppCompatActivity() {
     private val numberPattern: Pattern = Pattern.compile("[\\d]*[\\٫.,]?[\\d]+")
-    private val defaultMaxDiskSizeMb: Long = 16 shl 10
+    private val defaultHostReserveSizeMb: Long = 5 shl 10
 
     private var diskSizeStepMb: Long = 0
     private var diskSizeMb: Long = 0
@@ -59,10 +61,10 @@ class SettingsDiskResizeActivity : AppCompatActivity() {
     }
 
     private fun getAvailableSizeMb(): Long {
-        val usableSpaceMb =
-            bytesToMb(Environment.getDataDirectory().getUsableSpace()) and
-                (diskSizeStepMb - 1).inv()
-        return diskSizeMb + usableSpaceMb
+        var storageManager =
+            applicationContext.getSystemService(Context.STORAGE_SERVICE) as StorageManager
+        val hostAllocatableMb = bytesToMb(storageManager.getAllocatableBytes(UUID_DEFAULT))
+        return diskSizeMb + hostAllocatableMb
     }
 
     private fun mbToProgress(bytes: Long): Int {
@@ -82,7 +84,10 @@ class SettingsDiskResizeActivity : AppCompatActivity() {
         val image = InstalledImage.getDefault(this)
         diskSizeMb = bytesToMb(image.getApparentSize())
         val minDiskSizeMb = bytesToMb(image.getSmallestSizePossible()).coerceAtMost(diskSizeMb)
-        val maxDiskSizeMb = defaultMaxDiskSizeMb.coerceAtMost(getAvailableSizeMb())
+        var maxDiskSizeMb = getAvailableSizeMb()
+        if (maxDiskSizeMb > defaultHostReserveSizeMb) {
+            maxDiskSizeMb -= defaultHostReserveSizeMb
+        }
 
         diskSizeText = findViewById<TextView>(R.id.settings_disk_resize_resize_gb_assigned)!!
         diskMaxSizeText = findViewById<TextView>(R.id.settings_disk_resize_resize_gb_max)