replace the default scheduler code with a udev rule

[Xose Vazquez Perez <xose.vazquez@xxxxxxxxx>]

hi,

udev can handle it, as do 60-readahead.rules with read_ahead_kb
in s390-tools.

change part of this, drivers/s390/block/dasd.c:

/*
 * Allocate and initialize request queue and default I/O scheduler.
 */
static int dasd_alloc_queue(struct dasd_block *block)
{
	int rc;

	block->request_queue = blk_init_queue(do_dasd_request,
					       &block->request_queue_lock);
	if (block->request_queue == NULL)
		return -ENOMEM;

	block->request_queue->queuedata = block;

	elevator_exit(block->request_queue->elevator);
	block->request_queue->elevator = NULL;
	rc = elevator_init(block->request_queue, "deadline");
	if (rc) {
		blk_cleanup_queue(block->request_queue);
		return rc;
	}
	return 0;
}


for this other, 61-scheduler.rules :

#
# Rules to change the default scheduler to deadline
# This file should be installed in /etc/udev/rules.d
#

SUBSYSTEM!="block", GOTO="ra_end"

ACTION!="add", GOTO="ra_end"
# on device add change the default scheduler to deadline
KERNEL=="sd*[!0-9]", ATTR{queue/scheduler}="deadline"
KERNEL=="dasd*[!0-9]", ATTR{queue/scheduler}="deadline"

LABEL="ra_end"


simpler, more flexible and less C code.

-thanks-
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