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The bug only appears when: - windows 11 copies a file that has an alternate data stream - streams_xattr is enabled on the share configuration. Microsoft Edge adds a ZoneIdentifier data stream containing the URL for files it downloads. Another way to create a test file: - open cmd.exe - echo "hello from default data stream" > hello.txt - echo "hello again from ads" > hello.txt:ads.txt If you open the file using notepad, we'll see the first message. If you run "notepad hello.txt:ads.txt" in cmd.exe, we should see the second message. dir /s /r should least all streams for the file. The truncation happens because the windows 11 client sends a SetInfo/EndOfFile message on the ADS, but it is instead applied on the main file, because we don't check fp->stream. When receiving set/get info file for a stream file, Change to process requests using stream position and size. Truncate is unnecessary for stream files, so we skip set_file_allocation_info and set_end_of_file_info operations. Reported-by: Marios Makassikis <mmakassikis@freebox.fr> Signed-off-by: Namjae Jeon <linkinjeon@kernel.org> Signed-off-by: Steve French <stfrench@microsoft.com>