26a0ee75c6
bypass some extra anti-foot-shooting measures. Currently, its only effect is to allow detaching a device while it's still open (e.g., mounted). This is useful for testing how the system reacts to a disk suddenly going away, which can happen with some removeable media. At this point, the force option is only checked on detach, so it would've been possible to allow the option to be passed with the MDIOCDETACH operation. This was not done to allow the possibility of having the force flag influence other tests in the future, which may not necessarily deal with detaching the device. Reviewed by: sobomax Approved by: phk
316 lines
7.9 KiB
C
316 lines
7.9 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/module.h>
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#include <sys/linker.h>
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#include <sys/mdioctl.h>
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#include <sys/sysctl.h>
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#include <sys/queue.h>
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int list(const int);
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int query(const int, const int);
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struct md_ioctl mdio;
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enum {UNSET, ATTACH, DETACH, LIST} action = UNSET;
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void mdmaybeload(void);
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void usage(void);
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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, "\tmdconfig -l [-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}\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, "ab:df:lo: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 'l':
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if (cmdline != 0)
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usage();
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action = LIST;
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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 != 1 && cmdline != 2)
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usage();
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if (cmdline == 1) {
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/* Imply ``-t 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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}
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mdio.md_file = optarg;
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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, "force"))
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mdio.md_options |= MD_FORCE;
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else if (!strcmp(optarg, "noforce"))
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mdio.md_options &= ~MD_FORCE;
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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
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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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if (!strncmp(optarg, "/dev/", 5))
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optarg += 5;
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if (!strncmp(optarg, MD_NAME, sizeof(MD_NAME) - 1))
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optarg += sizeof(MD_NAME) - 1;
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mdio.md_unit = strtoul(optarg, &p, 0);
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if ((unsigned)mdio.md_unit == ULONG_MAX || *p != '\0')
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errx(1, "bad unit: %s", optarg);
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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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mdmaybeload();
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fd = open("/dev/" MDCTL_NAME, O_RDWR, 0);
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if (fd < 0)
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err(1, "open(/dev/%s)", MDCTL_NAME);
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if (cmdline == 2
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&& (mdio.md_type == MD_MALLOC || mdio.md_type == MD_SWAP))
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if (mdio.md_size == 0)
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errx(1, "must specify -s for -t malloc or -t swap");
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if (action == LIST) {
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if (mdio.md_options & MD_AUTOUNIT)
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list(fd);
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else
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query(fd, mdio.md_unit);
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} else if (action == ATTACH) {
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i = ioctl(fd, MDIOCATTACH, &mdio);
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if (i < 0)
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err(1, "ioctl(/dev/%s)", MDCTL_NAME);
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if (mdio.md_options & MD_AUTOUNIT)
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printf("%s%d\n", MD_NAME, mdio.md_unit);
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} else if (action == DETACH) {
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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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if (i < 0)
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err(1, "ioctl(/dev/%s)", MDCTL_NAME);
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} else
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usage();
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close (fd);
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return (0);
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}
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struct dl {
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int unit;
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SLIST_ENTRY(dl) slist;
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};
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SLIST_HEAD(, dl) dlist = SLIST_HEAD_INITIALIZER(&dlist);
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int
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list(const int fd)
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{
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char *disklist, *p, *p2, *p3;
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int unit;
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size_t dll;
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struct dl *dp, *di, *dn;
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if (sysctlbyname("kern.disks", NULL, &dll, NULL, 0) == -1)
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err(1, "sysctlbyname: kern.disks");
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if ( (disklist = malloc(dll)) == NULL)
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err(1, "malloc");
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if (sysctlbyname("kern.disks", disklist, &dll, NULL, NULL) == -1)
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err(1, "sysctlbyname: kern.disks");
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for (p = disklist;
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(p2 = strsep(&p, " ")) != NULL;) {
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if (strncmp(p2, MD_NAME, sizeof(MD_NAME) - 1) != 0)
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continue;
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p2 += sizeof(MD_NAME) - 1;
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unit = strtoul(p2, &p3, 10);
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if (p2 == p3)
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continue;
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dp = calloc(sizeof *dp, 1);
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dp->unit = unit;
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dn = SLIST_FIRST(&dlist);
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if (dn == NULL || dn->unit > unit) {
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SLIST_INSERT_HEAD(&dlist, dp, slist);
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} else {
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SLIST_FOREACH(di, &dlist, slist) {
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dn = SLIST_NEXT(di, slist);
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if (dn == NULL || dn->unit > unit) {
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SLIST_INSERT_AFTER(di, dp, slist);
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break;
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}
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}
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}
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}
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SLIST_FOREACH(di, &dlist, slist)
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query(fd, di->unit);
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while (!SLIST_EMPTY(&dlist)) {
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di = SLIST_FIRST(&dlist);
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SLIST_REMOVE_HEAD(&dlist, slist);
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free(di);
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}
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free(disklist);
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return (0);
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}
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int
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query(const int fd, const int unit)
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{
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mdio.md_unit = unit;
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if (ioctl(fd, MDIOCQUERY, &mdio) < 0)
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err(1, "ioctl(/dev/%s)", MDCTL_NAME);
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switch (mdio.md_type) {
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case MD_MALLOC:
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(void)printf("%s%d\tmalloc\t%d KBytes\n", MD_NAME,
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mdio.md_unit, mdio.md_size / 2);
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break;
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case MD_PRELOAD:
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(void)printf("%s%d\tpreload\t%d KBytes\n", MD_NAME,
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mdio.md_unit, mdio.md_size / 2);
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break;
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case MD_SWAP:
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(void)printf("%s%d\tswap\t%d KBytes\n", MD_NAME,
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mdio.md_unit, mdio.md_size / 2);
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break;
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case MD_VNODE:
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(void)printf("%s%d\tvnode\t%d KBytes\n", MD_NAME,
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mdio.md_unit, mdio.md_size / 2);
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break;
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}
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return (0);
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}
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void
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mdmaybeload(void)
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{
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struct module_stat mstat;
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int fileid, modid;
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const char *name;
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char *cp;
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name = MD_NAME;
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/* scan files in kernel */
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mstat.version = sizeof(struct module_stat);
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for (fileid = kldnext(0); fileid > 0; fileid = kldnext(fileid)) {
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/* scan modules in file */
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for (modid = kldfirstmod(fileid); modid > 0;
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modid = modfnext(modid)) {
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if (modstat(modid, &mstat) < 0)
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continue;
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/* strip bus name if present */
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if ((cp = strchr(mstat.name, '/')) != NULL) {
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cp++;
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} else {
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cp = mstat.name;
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}
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/* already loaded? */
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if (!strcmp(name, cp))
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return;
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}
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}
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/* not present, we should try to load it */
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kldload(name);
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}
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