Using the mdconfig(8) program you can now configure memory disks on malloc(9), swap or a file/vnode. preloaded md disks also work as usual.
154 lines
3.9 KiB
C
154 lines
3.9 KiB
C
/*
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* ----------------------------------------------------------------------------
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* "THE BEER-WARE LICENSE" (Revision 42):
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* <phk@FreeBSD.ORG> wrote this file. As long as you retain this notice you
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* can do whatever you want with this stuff. If we meet some day, and you think
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* this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp
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* ----------------------------------------------------------------------------
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*
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* $FreeBSD$
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <string.h>
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#include <err.h>
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#include <sys/ioctl.h>
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#include <sys/param.h>
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#include <sys/mdioctl.h>
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struct md_ioctl mdio;
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enum {UNSET, ATTACH, DETACH} action = UNSET;
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void
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usage()
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{
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fprintf(stderr, "Usage:\n");
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fprintf(stderr, "\tmdconfig -a -t type [-o [no]option]... [ -f file] [-s size] [-u unit]\n");
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fprintf(stderr, "\tmdconfig -d -u unit\n");
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fprintf(stderr, "\t\ttype = {malloc, preload, vnode, swap}\n");
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fprintf(stderr, "\t\toption = {cluster, compress, reserve, autounit}\n");
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fprintf(stderr, "\t\tsize = %%d (512 byte blocks), %%dk (kB), %%dm (MB) or %%dg (GB)\n");
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exit(1);
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}
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int
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main(int argc, char **argv)
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{
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int ch, fd, i;
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char *p;
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int cmdline = 0;
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for (;;) {
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ch = getopt(argc, argv, "adf:o:s:t:u:");
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if (ch == -1)
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break;
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switch (ch) {
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case 'a':
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if (cmdline != 0)
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usage();
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action = ATTACH;
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cmdline = 1;
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break;
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case 'd':
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if (cmdline != 0)
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usage();
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action = DETACH;
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mdio.md_options = MD_AUTOUNIT;
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cmdline = 3;
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break;
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case 't':
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if (cmdline != 1)
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usage();
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if (!strcmp(optarg, "malloc")) {
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mdio.md_type = MD_MALLOC;
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mdio.md_options = MD_AUTOUNIT | MD_COMPRESS;
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} else if (!strcmp(optarg, "preload")) {
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mdio.md_type = MD_PRELOAD;
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mdio.md_options = 0;
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} else if (!strcmp(optarg, "vnode")) {
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mdio.md_type = MD_VNODE;
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mdio.md_options = MD_CLUSTER | MD_AUTOUNIT | MD_COMPRESS;
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} else if (!strcmp(optarg, "swap")) {
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mdio.md_type = MD_SWAP;
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mdio.md_options = MD_CLUSTER | MD_AUTOUNIT | MD_COMPRESS;
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} else {
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usage();
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}
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cmdline=2;
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break;
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case 'f':
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if (cmdline != 2)
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usage();
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strncpy(mdio.md_file, optarg, sizeof(mdio.md_file) - 1);
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break;
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case 'o':
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if (cmdline != 2)
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usage();
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if (!strcmp(optarg, "cluster"))
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mdio.md_options |= MD_CLUSTER;
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else if (!strcmp(optarg, "nocluster"))
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mdio.md_options &= ~MD_CLUSTER;
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else if (!strcmp(optarg, "compress"))
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mdio.md_options |= MD_COMPRESS;
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else if (!strcmp(optarg, "nocompress"))
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mdio.md_options &= ~MD_COMPRESS;
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else if (!strcmp(optarg, "reserve"))
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mdio.md_options |= MD_RESERVE;
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else if (!strcmp(optarg, "noreserve"))
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mdio.md_options &= ~MD_RESERVE;
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else if (!strcmp(optarg, "autounit"))
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mdio.md_options |= MD_AUTOUNIT;
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else if (!strcmp(optarg, "noautounit"))
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mdio.md_options &= ~MD_AUTOUNIT;
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else
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errx(1, "Unknown option.");
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break;
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case 's':
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if (cmdline != 2)
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usage();
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mdio.md_size = strtoul(optarg, &p, 0);
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if (p == NULL || *p == '\0')
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;
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else if (*p == 'k' || *p == 'K')
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mdio.md_size *= (1024 / DEV_BSIZE);
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else if (*p == 'm' || *p == 'M')
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mdio.md_size *= (1024 * 1024 / DEV_BSIZE);
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else if (*p == 'g' || *p == 'G')
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mdio.md_size *= (1024 * 1024 * 1024 / DEV_BSIZE);
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else
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errx(1, "Unknown suffix on -s argument");
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break;
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case 'u':
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if (cmdline != 2 && cmdline != 3)
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usage();
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mdio.md_unit = strtoul(optarg, NULL, 0);
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mdio.md_options &= ~MD_AUTOUNIT;
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break;
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default:
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usage();
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}
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}
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fd = open("/dev/mdctl", O_RDWR, 0);
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if (fd < 0)
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err(1, "open(/dev/mdctl)");
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if (action == ATTACH) {
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i = ioctl(fd, MDIOCATTACH, &mdio);
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} else {
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if (mdio.md_options & MD_AUTOUNIT)
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usage();
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i = ioctl(fd, MDIOCDETACH, &mdio);
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}
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if (i < 0)
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err(1, "ioctl(/dev/mdctl)");
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if (mdio.md_options & MD_AUTOUNIT)
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printf("md%d\n", mdio.md_unit);
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return (0);
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}
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