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Commitc31f91c6af("fuse: don't allow signals to interrupt getdents copying") introduced the use of high bits in d_type as flags. However, overlayfs was not adapted to handle this change. In ovl_cache_entry_new(), the code checks if d_type == DT_CHR to determine if an entry might be a whiteout. When fuse is used as the lower layer and sets high bits in d_type, this comparison fails, causing whiteout files to not be recognized properly and resulting in incorrect overlayfs behavior. Fix this by requiring callers of iterate_dir() to opt-in for getting flag bits in d_type outside of S_DT_MASK. Fixes:c31f91c6af("fuse: don't allow signals to interrupt getdents copying") Link: https://lore.kernel.org/all/20260107034551.439-1-luochunsheng@ustc.edu/ Link: https://github.com/containerd/stargz-snapshotter/issues/2214 Reported-by: Chunsheng Luo <luochunsheng@ustc.edu> Reviewed-by: Chunsheng Luo <luochunsheng@ustc.edu> Tested-by: Chunsheng Luo <luochunsheng@ustc.edu> Signed-off-by: Amir Goldstein <amir73il@gmail.com> Link: https://patch.msgid.link/20260108074522.3400998-1-amir73il@gmail.com Signed-off-by: Christian Brauner <brauner@kernel.org>