1 files changed, 10 insertions, 2 deletions
diff --git a/llvm/lib/Support/VirtualFileSystem.cpp b/llvm/lib/Support/VirtualFileSystem.cpp
index cb34fa60..14e9f02 100644
--- a/llvm/lib/Support/VirtualFileSystem.cpp
+++ b/llvm/lib/Support/VirtualFileSystem.cpp
@@ -2163,10 +2163,16 @@ RedirectingFileSystem::lookupPathImpl(
 static Status getRedirectedFileStatus(const Twine &OriginalPath,
                                       bool UseExternalNames,
                                       Status ExternalStatus) {
+  // The path has been mapped by some nested VFS, don't override it with the
+  // original path.
+  if (ExternalStatus.ExposesExternalVFSPath)
+    return ExternalStatus;
+
   Status S = ExternalStatus;
   if (!UseExternalNames)
     S = Status::copyWithNewName(S, OriginalPath);
-  S.IsVFSMapped = true;
+  else
+    S.ExposesExternalVFSPath = true;
   return S;
 }
 
@@ -2268,7 +2274,9 @@ public:
 
 ErrorOr<std::unique_ptr<File>>
 File::getWithPath(ErrorOr<std::unique_ptr<File>> Result, const Twine &P) {
-  if (!Result)
+  // See \c getRedirectedFileStatus - don't update path if it's already been
+  // mapped.
+  if (!Result || (*Result)->status()->ExposesExternalVFSPath)
     return Result;
 
   ErrorOr<std::unique_ptr<File>> F = std::move(*Result);