Set quota project ID and inheritance on top-level storage directory.

When creating external storage directories like /data/media/0, make sure
we set the quota project ID correctly, and enable project ID
inheritance. This ensures that all directories/files under this will be
created with the correct project ID and inheritance as well.

Bug: 146419093
Test: lsattr -p on /data/media
Change-Id: I32bfced0d67eb8c1865897b085324f00c55926a0

FsCrypt.cpp

@@ -62,8 +62,11 @@
 using android::base::StringPrintf;
 using android::fs_mgr::GetEntryForMountPoint;
 using android::vold::BuildDataPath;
+using android::vold::IsFilesystemSupported;
 using android::vold::kEmptyAuthentication;
 using android::vold::KeyBuffer;
+using android::vold::SetQuotaInherit;
+using android::vold::SetQuotaProjectId;
 using android::vold::writeStringToFile;
 using namespace android::fscrypt;
 
@@ -783,6 +786,14 @@ bool fscrypt_prepare_user_storage(const std::string& volume_uuid, userid_t user_
             if (!prepare_dir(vendor_ce_path, 0771, AID_ROOT, AID_ROOT)) return false;
         }
         if (!prepare_dir(media_ce_path, 0770, AID_MEDIA_RW, AID_MEDIA_RW)) return false;
+        // Setup quota project ID and inheritance policy
+        if (!IsFilesystemSupported("sdcardfs")) {
+            if (SetQuotaInherit(media_ce_path) != 0) return false;
+            if (SetQuotaProjectId(media_ce_path, multiuser_get_uid(user_id, AID_MEDIA_RW)) != 0) {
+                return false;
+            }
+        }
+
         if (!prepare_dir(user_ce_path, 0771, AID_SYSTEM, AID_SYSTEM)) return false;
 
         if (fscrypt_is_native()) {