QFileSystemEngine: a file only exists if its link count is not 0

QFileSystemMetaData::fillFromStatBuf is used when filling in the results
from both stat() as well as fstat(). Obviously the file exists if it was
stat()ed but not necessarily so by fstat(): we could be operating on a
file descriptor referring to an unlinked file or an O_TMPFILE.

Change-Id: I8d96dea9955d4c749b99fffd14cd52a8c8dd9ca1
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>

1 files changed, 6 insertions, 2 deletions

diff --git a/src/corelib/io/qfsfileengine_unix.cpp b/src/corelib/io/qfsfileengine_unix.cpp
index 69961ff76a..dadd5d9bcf 100644
--- a/src/corelib/io/qfsfileengine_unix.cpp
+++ b/src/corelib/io/qfsfileengine_unix.cpp
@@ -495,11 +495,14 @@ QAbstractFileEngine::FileFlags QFSFileEngine::fileFlags(FileFlags type) const
                     | QFileSystemMetaData::LinkType
                     | QFileSystemMetaData::FileType
                     | QFileSystemMetaData::DirectoryType
-                    | QFileSystemMetaData::BundleType;
+                    | QFileSystemMetaData::BundleType
+                    | QFileSystemMetaData::WasDeletedAttribute;
 
         if (type & FlagsMask)
             queryFlags |= QFileSystemMetaData::HiddenAttribute
                     | QFileSystemMetaData::ExistsAttribute;
+        else if (type & ExistsFlag)
+            queryFlags |= QFileSystemMetaData::WasDeletedAttribute;
 
         queryFlags |= QFileSystemMetaData::LinkType;
 
@@ -531,7 +534,8 @@ QAbstractFileEngine::FileFlags QFSFileEngine::fileFlags(FileFlags type) const
     }
 
     if (type & FlagsMask) {
-        if (exists)
+        // the inode existing does not mean the file exists
+        if (!d->metaData.wasDeleted())
             ret |= ExistsFlag;
         if (d->fileEntry.isRoot())
             ret |= RootFlag;