| 1 | /* |
| 2 | * Copyright (c) 2010 The DragonFly Project. All rights reserved. |
| 3 | * |
| 4 | * This code is derived from software contributed to The DragonFly Project |
| 5 | * by Alex Hornung <ahornung@gmail.com> |
| 6 | * |
| 7 | * Redistribution and use in source and binary forms, with or without |
| 8 | * modification, are permitted provided that the following conditions |
| 9 | * are met: |
| 10 | * |
| 11 | * 1. Redistributions of source code must retain the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer. |
| 13 | * 2. Redistributions in binary form must reproduce the above copyright |
| 14 | * notice, this list of conditions and the following disclaimer in |
| 15 | * the documentation and/or other materials provided with the |
| 16 | * distribution. |
| 17 | * 3. Neither the name of The DragonFly Project nor the names of its |
| 18 | * contributors may be used to endorse or promote products derived |
| 19 | * from this software without specific, prior written permission. |
| 20 | * |
| 21 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 22 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 23 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
| 24 | * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
| 25 | * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 26 | * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, |
| 27 | * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
| 28 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED |
| 29 | * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| 30 | * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
| 31 | * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 32 | * SUCH DAMAGE. |
| 33 | */ |
| 34 | |
| 35 | #include <sys/types.h> |
| 36 | #include <sys/cdefs.h> |
| 37 | #include <sys/syslimits.h> |
| 38 | #include <sys/ioctl.h> |
| 39 | #include <sys/device.h> |
| 40 | #include <sys/queue.h> |
| 41 | #include <sys/stat.h> |
| 42 | #include <sys/dsched.h> |
| 43 | |
| 44 | #include <ctype.h> |
| 45 | #include <err.h> |
| 46 | #include <errno.h> |
| 47 | #include <fcntl.h> |
| 48 | #include <grp.h> |
| 49 | #include <libgen.h> |
| 50 | #include <pwd.h> |
| 51 | #include <stdarg.h> |
| 52 | #include <stdio.h> |
| 53 | #include <stdlib.h> |
| 54 | #include <string.h> |
| 55 | #include <unistd.h> |
| 56 | |
| 57 | #define DSCHED_FOREACH_DISK(dev_fd, diocp) \ |
| 58 | for ((diocp)->num_elem = 0; \ |
| 59 | (ioctl((dev_fd), \ |
| 60 | DSCHED_LIST_DISKS, (diocp)) != -1); \ |
| 61 | ++(diocp)->num_elem) |
| 62 | |
| 63 | #define DSCHED_FOREACH_POLICY(dev_fd, diocp) \ |
| 64 | for ((diocp)->num_elem = 0; \ |
| 65 | (ioctl((dev_fd), \ |
| 66 | DSCHED_LIST_POLICIES, (diocp)) != -1); \ |
| 67 | ++(diocp)->num_elem) |
| 68 | |
| 69 | static int dev_fd; |
| 70 | static int verbose = 0; |
| 71 | |
| 72 | static void |
| 73 | usage(void) |
| 74 | { |
| 75 | fprintf(stderr, |
| 76 | "Usage: dschedctl <commands>\n" |
| 77 | "Valid commands are:\n" |
| 78 | " -l [disk]\n" |
| 79 | "\t Lists all disks and their policies, or just for [disk]\n" |
| 80 | " -p\n" |
| 81 | "\t Lists all available I/O scheduling policies\n" |
| 82 | " -s <policy> [disk]\n" |
| 83 | "\t Switches the policy of [disk] or otherwise all disks to " |
| 84 | "<policy>\n"); |
| 85 | |
| 86 | exit(1); |
| 87 | } |
| 88 | |
| 89 | static int |
| 90 | dsched_ioctl(unsigned long cmd, struct dsched_ioctl *pdioc) |
| 91 | { |
| 92 | if (ioctl(dev_fd, cmd, pdioc) == -1) |
| 93 | err(1, "ioctl"); |
| 94 | |
| 95 | return 0; |
| 96 | } |
| 97 | |
| 98 | static int dsched_set_disk_policy(char *disk_name, char *policy) |
| 99 | { |
| 100 | struct dsched_ioctl dioc; |
| 101 | int error; |
| 102 | |
| 103 | bzero(&dioc, sizeof(dioc)); |
| 104 | strncpy(dioc.dev_name, disk_name, DSCHED_NAME_LENGTH); |
| 105 | strncpy(dioc.pol_name, policy, DSCHED_NAME_LENGTH); |
| 106 | error = dsched_ioctl(DSCHED_SET_DEVICE_POLICY, &dioc); |
| 107 | |
| 108 | if ((!error) && verbose) { |
| 109 | printf("Switched scheduler policy of %s successfully to %s\n", |
| 110 | disk_name, policy); |
| 111 | } |
| 112 | |
| 113 | return error; |
| 114 | } |
| 115 | |
| 116 | int main(int argc, char *argv[]) |
| 117 | { |
| 118 | struct dsched_ioctl dioc; |
| 119 | char *disk_name = NULL; |
| 120 | char *policy = NULL; |
| 121 | int dflag = 0, lflag = 0, pflag = 0, sflag = 0; |
| 122 | int ch, error = 0; |
| 123 | |
| 124 | while ((ch = getopt(argc, argv, "hlps:v")) != -1) { |
| 125 | switch (ch) { |
| 126 | case 'l': |
| 127 | lflag = 1; |
| 128 | break; |
| 129 | case 'p': |
| 130 | pflag = 1; |
| 131 | break; |
| 132 | case 's': |
| 133 | sflag = 1; |
| 134 | policy = optarg; |
| 135 | break; |
| 136 | case 'v': |
| 137 | verbose = 1; |
| 138 | break; |
| 139 | case 'h': |
| 140 | case '?': |
| 141 | default: |
| 142 | usage(); |
| 143 | /* NOT REACHED */ |
| 144 | } |
| 145 | } |
| 146 | |
| 147 | argc -= optind; |
| 148 | argv += optind; |
| 149 | |
| 150 | if (argc == 1) { |
| 151 | dflag = 1; |
| 152 | if (strncmp(argv[0], "/dev/", 5) == 0) { |
| 153 | disk_name = argv[0] + 5; |
| 154 | } else { |
| 155 | disk_name = argv[0]; |
| 156 | } |
| 157 | } else if (argc > 1) { |
| 158 | usage(); |
| 159 | /* NOT REACHED */ |
| 160 | } |
| 161 | |
| 162 | /* |
| 163 | * Check arguments: |
| 164 | * - need to use at least one mode |
| 165 | */ |
| 166 | if (!(lflag || pflag || sflag)) { |
| 167 | usage(); |
| 168 | /* NOT REACHED */ |
| 169 | } |
| 170 | |
| 171 | dev_fd = open("/dev/dsched", O_RDWR); |
| 172 | if (dev_fd == -1) |
| 173 | err(1, "open(/dev/dsched)"); |
| 174 | |
| 175 | if (lflag) { |
| 176 | if (dflag) { |
| 177 | strncpy(dioc.dev_name, disk_name, DSCHED_NAME_LENGTH); |
| 178 | error = dsched_ioctl(DSCHED_LIST_DISK, &dioc); |
| 179 | if (!error) { |
| 180 | printf("%s\t=>\t%s\n", |
| 181 | disk_name, dioc.pol_name); |
| 182 | } |
| 183 | } else { |
| 184 | DSCHED_FOREACH_DISK(dev_fd, &dioc) { |
| 185 | printf("%s\t=>\t%s\n", |
| 186 | dioc.dev_name, dioc.pol_name); |
| 187 | } |
| 188 | } |
| 189 | } |
| 190 | |
| 191 | if (pflag) { |
| 192 | DSCHED_FOREACH_POLICY(dev_fd, &dioc) { |
| 193 | printf("%s\n", dioc.pol_name); |
| 194 | } |
| 195 | } |
| 196 | |
| 197 | if (sflag) { |
| 198 | if (dflag) { |
| 199 | error = dsched_set_disk_policy(disk_name, policy); |
| 200 | } else { |
| 201 | DSCHED_FOREACH_DISK(dev_fd, &dioc) { |
| 202 | error = dsched_set_disk_policy(dioc.dev_name, |
| 203 | policy); |
| 204 | } |
| 205 | } |
| 206 | } |
| 207 | |
| 208 | close(dev_fd); |
| 209 | |
| 210 | return (error); |
| 211 | } |