+++ /dev/null
-.\"
-.\" Copyright (c) 2010
-.\" The DragonFly Project. 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.
-.\" 3. Neither the name of The DragonFly Project nor the names of its
-.\" contributors may be used to endorse or promote products derived
-.\" from this software without specific, prior written permission.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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
-.\" COPYRIGHT HOLDERS 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.
-.\"
-.Dd April 20, 2010
-.Os
-.Dt DSCHEDCTL 8
-.Sh NAME
-.Nm dschedctl
-.Nd manipulate disk policies
-.Sh SYNOPSIS
-.Nm
-.Fl l
-.Op Ar disk
-.Nm
-.Fl p
-.Nm
-.Op Fl v
-.Fl s Ar policy
-.Op Ar disk
-.Nm
-.Fl h
-.Sh DESCRIPTION
-The
-.Nm
-provides an interface to manipulate the in-kernel
-disk scheduler framework.
-.Pp
-The options are as follows:
-.Bl -tag -width indent
-.It Fl h
-Shows a usage message with a short description of
-.Nm Ap s
-options.
-.It Fl l Op Ar disk
-If
-.Ar disk
-is specified, the policy currently assigned to
-.Ar disk
-is shown.
-Otherwise all disks and their respective policies are shown.
-.It Fl p
-List all available dsched policies.
-Any of these policies can be set on any disk.
-.It Fl s Ar policy Op Ar disk
-Sets the dsched policy of
-.Ar disk
-if specified, or all disks if not, to
-.Ar policy .
-If the verbose mode is enabled, a message will be printed for each successful
-policy change.
-.It Fl v
-Enables verbose mode.
-.El
-.Sh HISTORY
-The
-.Nm
-utility appeared in
-.Dx 2.7 .
-.Sh AUTHORS
-.An Alex Hornung
+++ /dev/null
-/*
- * Copyright (c) 2010 The DragonFly Project. All rights reserved.
- *
- * This code is derived from software contributed to The DragonFly Project
- * by Alex Hornung <ahornung@gmail.com>
- *
- * 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.
- * 3. Neither the name of The DragonFly Project nor the names of its
- * contributors may be used to endorse or promote products derived
- * from this software without specific, prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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
- * COPYRIGHT HOLDERS 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.
- */
-
-#include <sys/types.h>
-#include <sys/cdefs.h>
-#include <sys/syslimits.h>
-#include <sys/ioctl.h>
-#include <sys/device.h>
-#include <sys/queue.h>
-#include <sys/stat.h>
-#include <sys/dsched.h>
-
-#include <err.h>
-#include <fcntl.h>
-#include <libgen.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-
-#define DSCHED_FOREACH_DISK(dev_fd, diocp) \
- for ((diocp)->num_elem = 0; \
- (ioctl((dev_fd), \
- DSCHED_LIST_DISKS, (diocp)) != -1); \
- ++(diocp)->num_elem)
-
-#define DSCHED_FOREACH_POLICY(dev_fd, diocp) \
- for ((diocp)->num_elem = 0; \
- (ioctl((dev_fd), \
- DSCHED_LIST_POLICIES, (diocp)) != -1); \
- ++(diocp)->num_elem)
-
-static int dev_fd;
-static int verbose = 0;
-
-static void
-usage(void)
-{
- fprintf(stderr,
- "Usage: dschedctl <commands>\n"
- "Valid commands are:\n"
- " -l [disk]\n"
- "\t Lists all disks and their policies, or just for [disk]\n"
- " -p\n"
- "\t Lists all available I/O scheduling policies\n"
- " -s <policy> [disk]\n"
- "\t Switches the policy of [disk] or otherwise all disks to "
- "<policy>\n");
-
- exit(1);
-}
-
-static int
-dsched_ioctl(unsigned long cmd, struct dsched_ioctl *pdioc)
-{
- if (ioctl(dev_fd, cmd, pdioc) == -1)
- err(1, "ioctl");
-
- return 0;
-}
-
-static int
-dsched_set_disk_policy(char *disk_name, char *policy)
-{
- struct dsched_ioctl dioc;
- int error;
-
- bzero(&dioc, sizeof(dioc));
- strncpy(dioc.dev_name, disk_name, DSCHED_NAME_LENGTH);
- strncpy(dioc.pol_name, policy, DSCHED_NAME_LENGTH);
- error = dsched_ioctl(DSCHED_SET_DEVICE_POLICY, &dioc);
-
- if ((!error) && verbose) {
- printf("Switched scheduler policy of %s successfully to %s\n",
- disk_name, policy);
- }
-
- return error;
-}
-
-int
-main(int argc, char *argv[])
-{
- struct dsched_ioctl dioc;
- char *disk_name = NULL;
- char *policy = NULL;
- int dflag = 0, lflag = 0, pflag = 0, sflag = 0;
- int ch, error = 0, found;
-
- while ((ch = getopt(argc, argv, "hlps:v")) != -1) {
- switch (ch) {
- case 'l':
- lflag = 1;
- break;
- case 'p':
- pflag = 1;
- break;
- case 's':
- sflag = 1;
- policy = optarg;
- break;
- case 'v':
- verbose = 1;
- break;
- case 'h':
- case '?':
- default:
- usage();
- /* NOT REACHED */
- }
- }
-
- argc -= optind;
- argv += optind;
-
- if (argc == 1) {
- dflag = 1;
- disk_name = basename(argv[0]);
- if (!disk_name)
- err(1, "basename");
- } else if (argc > 1) {
- usage();
- /* NOT REACHED */
- }
-
- /*
- * Check arguments:
- * - need to use at least one mode
- */
- if (!(lflag || pflag || sflag)) {
- usage();
- /* NOT REACHED */
- }
-
- dev_fd = open("/dev/dsched", O_RDWR);
- if (dev_fd == -1)
- err(1, "open(/dev/dsched)");
-
- if (lflag) {
- if (dflag) {
- strncpy(dioc.dev_name, disk_name, DSCHED_NAME_LENGTH);
- error = dsched_ioctl(DSCHED_LIST_DISK, &dioc);
- if (!error) {
- printf("%s\t=>\t%s\n",
- disk_name, dioc.pol_name);
- }
- } else {
- DSCHED_FOREACH_DISK(dev_fd, &dioc) {
- printf("%s\t=>\t%s\n",
- dioc.dev_name, dioc.pol_name);
- }
- }
- }
-
- if (pflag) {
- DSCHED_FOREACH_POLICY(dev_fd, &dioc) {
- printf("%s\n", dioc.pol_name);
- }
- }
-
- if (sflag) {
- found = 0;
- DSCHED_FOREACH_POLICY(dev_fd, &dioc) {
- if (strcmp(policy, dioc.pol_name) == 0) {
- found = 1;
- break;
- }
- }
- if (!found)
- errx(1, "Policy '%s' not available", policy);
-
- if (dflag) {
- error = dsched_set_disk_policy(disk_name, policy);
- } else {
- DSCHED_FOREACH_DISK(dev_fd, &dioc) {
- error = dsched_set_disk_policy(dioc.dev_name,
- policy);
- }
- }
- }
-
- close(dev_fd);
-
- return (error);
-}
projects / dragonfly.git / commitdiff