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/proc/self/mountinfo displays the source for the mount, but statmount() doesn't yet have a way to return it. Add a new STATMOUNT_SB_SOURCE flag, claim the 32-bit __spare1 field to hold the offset into the str[] array. Reviewed-by: Jan Kara <jack@suse.cz> Signed-off-by: Jeff Layton <jlayton@kernel.org> Link: https://lore.kernel.org/r/20241111-statmount-v4-3-2eaf35d07a80@kernel.org Acked-by: Miklos Szeredi <mszeredi@redhat.com> Signed-off-by: Christian Brauner <brauner@kernel.org>