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Upper layers such as NFSD need a way to query whether a filesystem handles filenames in a case-sensitive manner. Report VirtualBox shared folder case handling behavior via the FS_XFLAG_CASEFOLD flag. The case sensitivity property is queried from the VirtualBox host service at mount time and cached in struct vboxsf_sbi. The host determines case sensitivity based on the underlying host filesystem (for example, Windows NTFS is case-insensitive while Linux ext4 is case-sensitive). VirtualBox shared folders always preserve filename case exactly as provided by the guest. The host interface does not expose a separate case-preserving property; leaving FS_XFLAG_CASENONPRESERVING unset reports the POSIX-default case-preserving behavior, which matches vboxsf semantics. The callback is registered in all three inode_operations structures (directory, file, and symlink) to ensure consistent reporting across all inode types. Reviewed-by: Roland Mainz <roland.mainz@nrubsig.org> Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Link: https://patch.msgid.link/20260507-case-sensitivity-v14-11-e62cc8200435@oracle.com Signed-off-by: Christian Brauner <brauner@kernel.org>