geom_sched.c revision 212554
1206497Sluigi/*- 2206552Sluigi * Copyright (c) 2009 Fabio Checconi 3206552Sluigi * Copyright (c) 2010 Luigi Rizzo, Universita` di Pisa 4206497Sluigi * All rights reserved. 5206497Sluigi * 6206497Sluigi * Redistribution and use in source and binary forms, with or without 7206497Sluigi * modification, are permitted provided that the following conditions 8206497Sluigi * are met: 9206497Sluigi * 1. Redistributions of source code must retain the above copyright 10206497Sluigi * notice, this list of conditions and the following disclaimer. 11206497Sluigi * 2. Redistributions in binary form must reproduce the above copyright 12206497Sluigi * notice, this list of conditions and the following disclaimer in the 13206497Sluigi * documentation and/or other materials provided with the distribution. 14206497Sluigi * 15206497Sluigi * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND 16206497Sluigi * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17206497Sluigi * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18206497Sluigi * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE 19206497Sluigi * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20206497Sluigi * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21206497Sluigi * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22206497Sluigi * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23206497Sluigi * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24206497Sluigi * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25206497Sluigi * SUCH DAMAGE. 26206497Sluigi */ 27206497Sluigi 28206497Sluigi/* 29206497Sluigi * $Id$ 30206497Sluigi * $FreeBSD: head/sbin/geom/class/sched/geom_sched.c 212554 2010-09-13 13:48:18Z pjd $ 31206497Sluigi * 32206497Sluigi * This file implements the userspace library used by the 'geom' 33206497Sluigi * command to load and manipulate disk schedulers. 34206497Sluigi */ 35206497Sluigi 36206497Sluigi#include <sys/cdefs.h> 37206497Sluigi#include <sys/param.h> 38206497Sluigi#include <sys/linker.h> 39206497Sluigi#include <sys/module.h> 40206497Sluigi 41206497Sluigi#include <stdio.h> 42206497Sluigi#include <stdint.h> 43206497Sluigi#include <libgeom.h> 44206497Sluigi 45206497Sluigi#include "core/geom.h" 46206497Sluigi#include "misc/subr.h" 47206497Sluigi 48206497Sluigi#define G_SCHED_VERSION 0 49206497Sluigi 50206497Sluigiuint32_t lib_version = G_LIB_VERSION; 51206497Sluigiuint32_t version = G_SCHED_VERSION; 52206497Sluigi 53206497Sluigi/* 54206497Sluigi * storage for parameters used by this geom class. 55206497Sluigi * Right now only the scheduler name is used. 56206497Sluigi */ 57212547Spjd#define GSCHED_ALGO "rr" /* default scheduler */ 58206497Sluigi 59206497Sluigi/* 60206497Sluigi * Adapt to differences in geom library. 61206497Sluigi * in V1 struct g_command misses gc_argname, eld, and G_BOOL is undefined 62206497Sluigi */ 63212554Spjd#if G_LIB_VERSION <= 1 64206497Sluigi#define G_TYPE_BOOL G_TYPE_NUMBER 65212554Spjd#endif 66212554Spjd#if G_LIB_VERSION >= 3 && G_LIB_VERSION <= 4 67212554Spjd#define G_ARGNAME NULL, 68206497Sluigi#else 69212554Spjd#define G_ARGNAME 70206497Sluigi#endif 71206497Sluigi 72206497Sluigistatic void 73206497Sluigigcmd_createinsert(struct gctl_req *req, unsigned flags __unused) 74206497Sluigi{ 75206497Sluigi const char *reqalgo; 76206497Sluigi char name[64]; 77206497Sluigi 78206497Sluigi if (gctl_has_param(req, "algo")) 79206497Sluigi reqalgo = gctl_get_ascii(req, "algo"); 80206497Sluigi else 81212547Spjd reqalgo = GSCHED_ALGO; 82206497Sluigi 83206497Sluigi snprintf(name, sizeof(name), "gsched_%s", reqalgo); 84206497Sluigi /* 85206497Sluigi * Do not complain about errors here, gctl_issue() 86206497Sluigi * will fail anyway. 87206497Sluigi */ 88206497Sluigi if (modfind(name) < 0) 89206497Sluigi kldload(name); 90206497Sluigi gctl_issue(req); 91206497Sluigi} 92206497Sluigi 93206497Sluigistruct g_command class_commands[] = { 94206497Sluigi { "create", G_FLAG_VERBOSE | G_FLAG_LOADKLD, gcmd_createinsert, 95206497Sluigi { 96212547Spjd { 'a', "algo", GSCHED_ALGO, G_TYPE_STRING }, 97206497Sluigi G_OPT_SENTINEL 98206497Sluigi }, 99206497Sluigi G_ARGNAME "[-v] [-a algorithm_name] dev ..." 100206497Sluigi }, 101206497Sluigi { "insert", G_FLAG_VERBOSE | G_FLAG_LOADKLD, gcmd_createinsert, 102206497Sluigi { 103212547Spjd { 'a', "algo", GSCHED_ALGO, G_TYPE_STRING }, 104206497Sluigi G_OPT_SENTINEL 105206497Sluigi }, 106206497Sluigi G_ARGNAME "[-v] [-a algorithm_name] dev ..." 107206497Sluigi }, 108206497Sluigi { "configure", G_FLAG_VERBOSE, NULL, 109206497Sluigi { 110212547Spjd { 'a', "algo", GSCHED_ALGO, G_TYPE_STRING }, 111206497Sluigi G_OPT_SENTINEL 112206497Sluigi }, 113206497Sluigi G_ARGNAME "[-v] [-a algorithm_name] prov ..." 114206497Sluigi }, 115206497Sluigi { "destroy", G_FLAG_VERBOSE, NULL, 116206497Sluigi { 117206497Sluigi { 'f', "force", NULL, G_TYPE_BOOL }, 118206497Sluigi G_OPT_SENTINEL 119206497Sluigi }, 120206497Sluigi G_ARGNAME "[-fv] prov ..." 121206497Sluigi }, 122206497Sluigi { "reset", G_FLAG_VERBOSE, NULL, G_NULL_OPTS, 123206497Sluigi G_ARGNAME "[-v] prov ..." 124206497Sluigi }, 125206497Sluigi G_CMD_SENTINEL 126206497Sluigi}; 127