Fix verity discarded bug am: 9105f4baeb am: 15242fd179 am: 5465b60e7b

Original change: https://android-review.googlesource.com/c/platform/system/update_engine/+/1686865

Change-Id: I3012b932910d78275c91559a3b3ddcb1032746e3

1 files changed, 23 insertions, 0 deletions

diff --git a/payload_consumer/filesystem_verifier_action.cc b/payload_consumer/filesystem_verifier_action.cc
index 09dc638b..b14cbc8d 100644
--- a/payload_consumer/filesystem_verifier_action.cc
+++ b/payload_consumer/filesystem_verifier_action.cc
@@ -112,6 +112,14 @@ void FilesystemVerifierAction::Cleanup(ErrorCode code) {
   // This memory is not used anymore.
   buffer_.clear();
 
+  // If we didn't write verity, partitions were maped. Releaase resource now.
+  if (!install_plan_.write_verity &&
+      dynamic_control_->UpdateUsesSnapshotCompression()) {
+    LOG(INFO) << "Not writing verity and VABC is enabled, unmapping all "
+                 "partitions";
+    dynamic_control_->UnmapAllPartitions();
+  }
+
   if (cancelled_)
     return;
   if (code == ErrorCode::kSuccess && HasOutputPipe())
@@ -130,6 +138,21 @@ bool FilesystemVerifierAction::InitializeFdVABC() {
   const InstallPlan::Partition& partition =
       install_plan_.partitions[partition_index_];
 
+  if (!ShouldWriteVerity()) {
+    // In VABC, if we are not writing verity, just map all partitions,
+    // and read using regular fd on |postinstall_mount_device| .
+    // All read will go through snapuserd, which provides a consistent
+    // view: device will use snapuserd to read partition during boot.
+    // b/186196758
+    // Call UnmapAllPartitions() first, because if we wrote verity before, these
+    // writes won't be visible to previously opened snapuserd daemon. To ensure
+    // that we will see the most up to date data from partitions, call Unmap()
+    // then Map() to re-spin daemon.
+    dynamic_control_->UnmapAllPartitions();
+    dynamic_control_->MapAllPartitions();
+    return InitializeFd(partition.readonly_target_path);
+  }
+
   // FilesystemVerifierAction need the read_fd_.
   partition_fd_ =
       dynamic_control_->OpenCowFd(partition.name, partition.source_path, true);