Differential D15360 Diff 44440 head/lib/geom/sched/geom_sched.c

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head/lib/geom/sched/geom_sched.c

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svn:keywords	null	FreeBSD=%H \ No newline at end of property

				/*-
				* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
				*
				* Copyright (c) 2009 Fabio Checconi
				* Copyright (c) 2010 Luigi Rizzo, Universita` di Pisa
				* All rights reserved.
				*
				* Redistribution and use in source and binary forms, with or without
				* modification, are permitted provided that the following conditions
				* are met:
				* 1. Redistributions of source code must retain the above copyright
				* notice, this list of conditions and the following disclaimer.
				* 2. Redistributions in binary form must reproduce the above copyright
				* notice, this list of conditions and the following disclaimer in the
				* documentation and/or other materials provided with the distribution.
				*
				* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
				* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
				* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
				* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
				* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
				* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
				* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
				* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
				* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
				* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
				* SUCH DAMAGE.
				*/

				/*
				* $Id$
				* $FreeBSD$
				*
				* This file implements the userspace library used by the 'geom'
				* command to load and manipulate disk schedulers.
				*/

				#include <sys/cdefs.h>
				#include <sys/param.h>
				#include <sys/linker.h>
				#include <sys/module.h>

				#include <stdio.h>
				#include <stdint.h>
				#include <libgeom.h>

				#include "core/geom.h"
				#include "misc/subr.h"

				#define G_SCHED_VERSION 0

				uint32_t lib_version = G_LIB_VERSION;
				uint32_t version = G_SCHED_VERSION;

				/*
				* storage for parameters used by this geom class.
				* Right now only the scheduler name is used.
				*/
				#define GSCHED_ALGO "rr" /* default scheduler */

				/*
				* Adapt to differences in geom library.
				* in V1 struct g_command misses gc_argname, eld, and G_BOOL is undefined
				*/
				#if G_LIB_VERSION <= 1
				#define G_TYPE_BOOL G_TYPE_NUMBER
				#endif
				#if G_LIB_VERSION >= 3 && G_LIB_VERSION <= 4
				#define G_ARGNAME NULL,
				#else
				#define G_ARGNAME
				#endif

				static void
				gcmd_createinsert(struct gctl_req *req, unsigned flags __unused)
				{
				const char *reqalgo;
				char name[64];

				if (gctl_has_param(req, "algo"))
				reqalgo = gctl_get_ascii(req, "algo");
				else
				reqalgo = GSCHED_ALGO;

				snprintf(name, sizeof(name), "gsched_%s", reqalgo);
				/*
				* Do not complain about errors here, gctl_issue()
				* will fail anyway.
				*/
				if (modfind(name) < 0)
				kldload(name);
				gctl_issue(req);
				}

				struct g_command class_commands[] = {
				{ "create", G_FLAG_VERBOSE \| G_FLAG_LOADKLD, gcmd_createinsert,
				{
				{ 'a', "algo", GSCHED_ALGO, G_TYPE_STRING },
				G_OPT_SENTINEL
				},
				G_ARGNAME "[-v] [-a algorithm_name] dev ..."
				},
				{ "insert", G_FLAG_VERBOSE \| G_FLAG_LOADKLD, gcmd_createinsert,
				{
				{ 'a', "algo", GSCHED_ALGO, G_TYPE_STRING },
				G_OPT_SENTINEL
				},
				G_ARGNAME "[-v] [-a algorithm_name] dev ..."
				},
				{ "configure", G_FLAG_VERBOSE, NULL,
				{
				{ 'a', "algo", GSCHED_ALGO, G_TYPE_STRING },
				G_OPT_SENTINEL
				},
				G_ARGNAME "[-v] [-a algorithm_name] prov ..."
				},
				{ "destroy", G_FLAG_VERBOSE, NULL,
				{
				{ 'f', "force", NULL, G_TYPE_BOOL },
				G_OPT_SENTINEL
				},
				G_ARGNAME "[-fv] prov ..."
				},
				{ "reset", G_FLAG_VERBOSE, NULL, G_NULL_OPTS,
				G_ARGNAME "[-v] prov ..."
				},
				G_CMD_SENTINEL
				};