2001-02-27 Roland McGrath <roland@frob.com>

	Use a new, more flexible RPC interface to the default pager.
	This allows swapon to do its own interpretation of Linux swap
	signature pages, and to support partial-device stores such as
	store_open will return for regular files on disk filesystems.
	* swapon.c: Include <hurd/default_pager.h>, not <mach/default_pager.h>.
	(ignore_signature, require_signature, quiet): New variables.
	(options): Add --silent, --no-signature, --require-signature.
	(main: parse_opt): Parse them.
	(check_signature): New function.
	(swaponoff): Use it unless --no-signature set, to get a remapped store
	using the pages indicated by the Linux signature page.  Try new
	default_pager_paging_storage RPC first, using a possibly-remapped
	device store.  If the default pager does not support that, fall back
	to the old protocol that only supports whole devices (and wherein the
	default pager itself interprets a Linux signature page).
	* Makefile (swapon, swapoff): Depend on default_pagerUser.o.

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