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22853e4a KZ |
1 | /* |
2 | * elvtune.c - I/O elevator tuner | |
3 | * | |
4 | * Copyright (C) 2000 Andrea Arcangeli <andrea@suse.de> SuSE | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
7cebf0bb SK |
16 | * You should have received a copy of the GNU General Public License along |
17 | * with this program; if not, write to the Free Software Foundation, Inc., | |
18 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
22853e4a KZ |
19 | */ |
20 | ||
ba0c9030 SK |
21 | /* |
22 | * This command is deprecated. The utility is in maintenance mode, | |
23 | * meaning we keep them in source tree for backward compatibility | |
24 | * only. Do not waste time making this command better, unless the | |
25 | * fix is about security or other very critical issue. | |
26 | * | |
27 | * See Documentation/deprecated.txt for more information. | |
28 | */ | |
29 | ||
22853e4a | 30 | #include <fcntl.h> |
d26aa358 | 31 | #include <errno.h> |
22853e4a | 32 | #include <stdio.h> |
d26aa358 | 33 | #include <getopt.h> |
22853e4a KZ |
34 | #include <unistd.h> |
35 | #include <stdlib.h> | |
d26aa358 KZ |
36 | #include <string.h> |
37 | #include <sys/ioctl.h> | |
38 | #include <sys/utsname.h> | |
66ee8158 | 39 | #include "nls.h" |
8505ff35 | 40 | #include "blkdev.h" |
45ca68ec | 41 | #include "closestream.h" |
8505ff35 | 42 | #include "linux_version.h" |
22853e4a KZ |
43 | |
44 | /* this has to match with the kernel structure */ | |
66ee8158 | 45 | /* current version for ac19 and 2.2.16 */ |
22853e4a | 46 | typedef struct blkelv_ioctl_arg_s { |
66ee8158 | 47 | int queue_ID; |
22853e4a KZ |
48 | int read_latency; |
49 | int write_latency; | |
50 | int max_bomb_segments; | |
51 | } blkelv_ioctl_arg_t; | |
52 | ||
53 | static void | |
54 | usage(void) { | |
8e522bb7 | 55 | fprintf(stderr, "elvtune (%s)\n", PACKAGE_STRING); |
66ee8158 KZ |
56 | fprintf(stderr, _("usage:\n")); |
57 | fprintf(stderr, "\telvtune [-r r_lat] [-w w_lat] [-b b_lat]" | |
58 | " /dev/blkdev1 [/dev/blkdev2...]\n"); | |
22853e4a KZ |
59 | fprintf(stderr, "\telvtune -h\n"); |
60 | fprintf(stderr, "\telvtune -v\n"); | |
90d43eca | 61 | fprintf(stderr, _("\tNOTE: elvtune only works with 2.4 kernels\n")); |
d26aa358 | 62 | /* (ioctls exist in 2.2.16 - 2.5.57) */ |
22853e4a KZ |
63 | } |
64 | ||
65 | static void | |
66 | version(void) { | |
e421313d | 67 | fprintf(stderr, UTIL_LINUX_VERSION); |
22853e4a KZ |
68 | } |
69 | ||
70 | int | |
71 | main(int argc, char * argv[]) { | |
72 | int read_value = 0xbeefbeef, write_value = 0xbeefbeef, bomb_value = 0xbeefbeef; | |
73 | int read_set, write_set, bomb_set, set; | |
74 | char * devname; | |
75 | int fd; | |
76 | blkelv_ioctl_arg_t elevator; | |
77 | ||
78 | read_set = write_set = bomb_set = set = 0; | |
79 | ||
90d43eca PR |
80 | setlocale(LC_MESSAGES, ""); |
81 | bindtextdomain(PACKAGE, LOCALEDIR); | |
82 | textdomain(PACKAGE); | |
45ca68ec | 83 | atexit(close_stdout); |
90d43eca | 84 | |
22853e4a KZ |
85 | for (;;) { |
86 | int opt; | |
87 | ||
88 | opt = getopt(argc, argv, "r:w:b:hv"); | |
ffc43748 | 89 | if (opt == -1) |
22853e4a KZ |
90 | break; |
91 | switch (opt) { | |
92 | case 'r': | |
93 | read_value = atoi(optarg); | |
94 | read_set = set = 1; | |
95 | break; | |
96 | case 'w': | |
97 | write_value = atoi(optarg); | |
98 | write_set = set = 1; | |
99 | break; | |
100 | case 'b': | |
101 | bomb_value = atoi(optarg); | |
102 | bomb_set = set = 1; | |
103 | break; | |
104 | ||
105 | case 'h': | |
106 | usage(), exit(0); | |
107 | case 'v': | |
108 | version(), exit(0); | |
109 | ||
22853e4a | 110 | default: |
9404cc7f | 111 | usage(), exit(1); |
22853e4a KZ |
112 | } |
113 | } | |
114 | ||
115 | if (optind >= argc) | |
90d43eca | 116 | fprintf(stderr, _("missing blockdevice, use -h for help\n")), exit(1); |
8505ff35 | 117 | |
22853e4a KZ |
118 | while (optind < argc) { |
119 | devname = argv[optind++]; | |
120 | ||
121 | fd = open(devname, O_RDONLY|O_NONBLOCK); | |
122 | if (fd < 0) { | |
123 | perror("open"); | |
124 | break; | |
125 | } | |
126 | ||
d26aa358 KZ |
127 | /* mmj: If we get EINVAL it's not a 2.4 kernel, so warn about |
128 | that and exit. It should return ENOTTY however, so check for | |
129 | that as well in case it gets corrected in the future */ | |
130 | ||
22853e4a | 131 | if (ioctl(fd, BLKELVGET, &elevator) < 0) { |
d26aa358 | 132 | int errsv = errno; |
22853e4a | 133 | perror("ioctl get"); |
d26aa358 | 134 | if ((errsv == EINVAL || errsv == ENOTTY) && |
8505ff35 | 135 | get_linux_version() >= KERNEL_VERSION(2,5,58)) { |
d26aa358 | 136 | fprintf(stderr, |
90d43eca | 137 | _("\nelvtune is only useful on older " |
d26aa358 | 138 | "kernels;\nfor 2.6 use IO scheduler " |
90d43eca | 139 | "sysfs tunables instead..\n")); |
d26aa358 | 140 | } |
22853e4a KZ |
141 | break; |
142 | } | |
143 | ||
144 | if (set) { | |
145 | if (read_set) | |
146 | elevator.read_latency = read_value; | |
147 | if (write_set) | |
148 | elevator.write_latency = write_value; | |
149 | if (bomb_set) | |
150 | elevator.max_bomb_segments = bomb_value; | |
151 | ||
152 | if (ioctl(fd, BLKELVSET, &elevator) < 0) { | |
153 | perror("ioctl set"); | |
154 | break; | |
155 | } | |
156 | if (ioctl(fd, BLKELVGET, &elevator) < 0) { | |
157 | perror("ioctl reget"); | |
158 | break; | |
159 | } | |
160 | } | |
161 | ||
66ee8158 | 162 | printf("\n%s elevator ID\t\t%d\n", devname, elevator.queue_ID); |
22853e4a KZ |
163 | printf("\tread_latency:\t\t%d\n", elevator.read_latency); |
164 | printf("\twrite_latency:\t\t%d\n", elevator.write_latency); | |
165 | printf("\tmax_bomb_segments:\t%d\n\n", elevator.max_bomb_segments); | |
166 | ||
167 | if (close(fd) < 0) { | |
168 | perror("close"); | |
169 | break; | |
170 | } | |
171 | } | |
172 | ||
173 | return 0; | |
174 | } |