On Mon, 2 Jun 2025 at 19:17, Amir Goldstein <amir73il@xxxxxxxxx> wrote: > > Case folding is often applied to subtrees and not on an entire > filesystem. > > Disallowing layers from filesystems that support case folding is over > limiting. > > Replace the rule that case-folding capable are not allowed as layers > with a rule that case folded directories are not allowed in a merged > directory stack. > > Should case folding be enabled on an underlying directory while > overlayfs is mounted the outcome is generally undefined. > > Specifically in ovl_lookup(), we check the base underlying directory > and fail with -ESTALE and write a warning to kmsg if an underlying > directory case folding is enabled. > > Suggested-by: Kent Overstreet <kent.overstreet@xxxxxxxxx> > Link: https://lore.kernel.org/linux-fsdevel/20250520051600.1903319-1-kent.overstreet@xxxxxxxxx/ > Signed-off-by: Amir Goldstein <amir73il@xxxxxxxxx> Acked-by: Miklos Szeredi <mszeredi@xxxxxxxxxx> Looks good. Thanks for taking care of this. The only think I don't like is the pr_warn_ratelimited(). I totally understand why you did it, and I'd love to have generic infrastructure for returning extra error info without spamming dmesg. Oh well. Thanks, Miklos
