commit 956a45485a96b3cc3e7d946bc2e5b067e76c5c30
author Yi-yo Chiang <yochiang@google.com> Tue Oct 11 10:47:24 2022 +0000
committer Yi-yo Chiang <yochiang@google.com> Tue Oct 18 09:43:20 2022 +0000
tree 0cf21426a74c1836c97e73ff2315498f11605d25
parent c540ab9bf8b0dbdb18d580506ac28de2a3ef6673

Revert "fs_mgr_overlayfs: Revert to use /data only if VAB"

This reverts commit c540ab9bf8b0dbdb18d580506ac28de2a3ef6673.

Reason for revert: root cause is fixed

Bug: 253207748
Test: TH run g3-app-compat-main
Change-Id: I44c2535508a5718a823cdd61ad1938bba739c2a0

fs_mgr/fs_mgr_overlayfs.cpp

diff --git a/fs_mgr/fs_mgr_overlayfs.cpp b/fs_mgr/fs_mgr_overlayfs.cpp
index 6fbccf4..cc09d09 100644
--- a/fs_mgr/fs_mgr_overlayfs.cpp
+++ b/fs_mgr/fs_mgr_overlayfs.cpp
@@ -1089,7 +1089,7 @@
     return true;
 }
 
-static bool CanUseSuperPartition(const Fstab& fstab, bool* is_virtual_ab) {
+static bool CanUseSuperPartition(const Fstab& fstab) {
     auto slot_number = fs_mgr_overlayfs_slot_number();
     auto super_device = fs_mgr_overlayfs_super_device(slot_number);
     if (!fs_mgr_rw_access(super_device) || !fs_mgr_overlayfs_has_logical(fstab)) {
@@ -1099,7 +1099,6 @@
     if (!metadata) {
         return false;
     }
-    *is_virtual_ab = !!(metadata->header.flags & LP_HEADER_FLAG_VIRTUAL_AB_DEVICE);
     return true;
 }
 
@@ -1112,12 +1111,13 @@
         return *partition_exists;
     }
 
-    bool is_virtual_ab = false;
-    if (CanUseSuperPartition(fstab, &is_virtual_ab)) {
-        bool can_use_data = false;
-        if (is_virtual_ab && FilesystemHasReliablePinning("/data", &can_use_data) && can_use_data) {
-            return CreateScratchOnData(scratch_device, partition_exists);
-        }
+    // Try ImageManager on /data first.
+    bool can_use_data = false;
+    if (FilesystemHasReliablePinning("/data", &can_use_data) && can_use_data) {
+        return CreateScratchOnData(scratch_device, partition_exists);
+    }
+    // If that fails, see if we can land on super.
+    if (CanUseSuperPartition(fstab)) {
         return CreateDynamicScratch(scratch_device, partition_exists);
     }
     return false;