2000-03-19 Roland McGrath <roland@baalperazim.frob.com>

	* dev.h (struct dev): New members store_name, readonly, rdev.
	(dev_is_readonly): New inline function.
	* dev.c (dev_open): Take just one arg, a struct dev whose store==0.
	(dev_close): Shut down the store, but leave DEV intact with store==0.
	* storeio.c (struct storeio_argp_params): New type.
	(device, device_lock, store_name): Variables removed.
	(readonly, inhibit_cache, enforce_store, rdev): Likewise.
	These are all now members in struct storeio_argp_params or struct dev;
	rdev now uses dev_t instead of int.
	(parse_opt): Find a struct storeio_argp_params in STATE->input
	and fill it in accordingly.  Use makedev macro to construct rdev.
	(trivfs_append_args): Find options in struct dev off control hook.
	Use major, minor macros.
	(main): Make DEVICE a local here, and point FSYS->hook at it.
	Don't modify trivfs_allow_open.
	(getroot_hook): New static function.
	(trivfs_getroot_hook): New variable, initialized to that.
	(check_open_hook): Find struct dev in CNTL->hook and
	use new dev_open interface.  Use dev_is_readonly.
	(open_hook): Find struct dev in PEROPEN->cntl->hook and
	check DEV->store.
	(trivfs_modify_stat): Find struct dev in CRED->po->cntl->hook.
	Use dev_is_readonly.
	(trivfs_goaway): Find struct dev in FSYS->hook and use its lock.
	(trivfs_S_fsys_syncfs): Find struct dev in CNTL->hook.

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