[PATCH] D97850: Fix PCM read from ModuleCache for ext4 filesystem

[Ilya Kuteev via Phabricator via cfe-commits]

ilyakuteev created this revision.
ilyakuteev requested review of this revision.
Herald added a project: clang.
Herald added a subscriber: cfe-commits.

Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D97850

Files:
  clang/lib/Serialization/ModuleManager.cpp


Index: clang/lib/Serialization/ModuleManager.cpp
===================================================================
--- clang/lib/Serialization/ModuleManager.cpp
+++ clang/lib/Serialization/ModuleManager.cpp
@@ -470,6 +470,12 @@
   Optional<FileEntryRef> FileOrErr =
       expectedToOptional(FileMgr.getFileRef(FileName, /*OpenFile=*/true,
                                             /*CacheFailure=*/false));
+  if (FileOrErr) {
+    // On Linux ext4 FileManager's inode caching system does not
+    // provide us correct behaviour for ModuleCache directories.
+    // inode can be reused after PCM delete resulting in cache misleading.
+    FileOrErr = FileMgr.getBypassFile(*FileOrErr);
+  }
   if (!FileOrErr)
     return false;
 


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