862 lines
19 KiB
C
862 lines
19 KiB
C
/*
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* Mach Operating System
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* Copyright (c) 1992 Carnegie Mellon University
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* All Rights Reserved.
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*
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* Permission to use, copy, modify and distribute this software and its
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* documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
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* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie Mellon
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* the rights to redistribute these changes.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/disk.h>
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#include <sys/disklabel.h>
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#include <sys/diskpc98.h>
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#include <sys/param.h>
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#include <sys/stat.h>
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#include <sys/mount.h>
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#include <ctype.h>
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#include <fcntl.h>
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#include <err.h>
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#include <errno.h>
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#include <libgeom.h>
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#include <paths.h>
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#include <regex.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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int iotest;
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#define LBUF 100
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static char lbuf[LBUF];
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/*
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*
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* Ported to 386bsd by Julian Elischer Thu Oct 15 20:26:46 PDT 1992
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*
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* 14-Dec-89 Robert Baron (rvb) at Carnegie-Mellon University
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* Copyright (c) 1989 Robert. V. Baron
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* Created.
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*/
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#define Decimal(str, ans, tmp) if (decimal(str, &tmp, ans)) ans = tmp
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#define String(str, ans, len) {char *z = ans; char **dflt = &z; if (string(str, dflt)) strncpy(ans, *dflt, len); }
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#define RoundCyl(x) ((((x) + cylsecs - 1) / cylsecs) * cylsecs)
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#define MAX_SEC_SIZE 2048 /* maximum section size that is supported */
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#define MIN_SEC_SIZE 512 /* the sector size to start sensing at */
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static int secsize = 0; /* the sensed sector size */
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static char *disk;
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static int cyls, sectors, heads, cylsecs, disksecs;
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struct mboot {
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unsigned char padding[2]; /* force the longs to be long aligned */
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unsigned char bootinst[510];
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unsigned short int signature;
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struct pc98_partition parts[8];
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unsigned char large_sector_overflow[MAX_SEC_SIZE-MIN_SEC_SIZE];
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};
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static struct mboot mboot;
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static int fd;
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#define ACTIVE 0x80
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static uint dos_cyls;
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static uint dos_heads;
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static uint dos_sectors;
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static uint dos_cylsecs;
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#define MAX_ARGS 10
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typedef struct cmd {
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char cmd;
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int n_args;
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struct arg {
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char argtype;
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int arg_val;
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} args[MAX_ARGS];
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} CMD;
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static int B_flag = 0; /* replace boot code */
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static int a_flag = 0; /* set active partition */
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static int i_flag = 0; /* replace partition data */
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static int u_flag = 0; /* update partition data */
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static int s_flag = 0; /* Print a summary and exit */
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static int t_flag = 0; /* test only */
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static char *f_flag = NULL; /* Read config info from file */
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static int v_flag = 0; /* Be verbose */
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static struct part_type
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{
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unsigned char type;
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const char *name;
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} part_types[] = {
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{0x00, "unused"}
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,{0x01, "Primary DOS with 12 bit FAT"}
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,{0x11, "MSDOS"}
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,{0x20, "MSDOS"}
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,{0x21, "MSDOS"}
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,{0x22, "MSDOS"}
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,{0x23, "MSDOS"}
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,{0x02, "XENIX / file system"}
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,{0x03, "XENIX /usr file system"}
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,{0x04, "PC-UX"}
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,{0x05, "Extended DOS"}
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,{0x06, "Primary 'big' DOS (> 32MB)"}
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,{0x07, "OS/2 HPFS, QNX or Advanced UNIX"}
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,{0x08, "AIX file system"}
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,{0x09, "AIX boot partition or Coherent"}
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,{0x0A, "OS/2 Boot Manager or OPUS"}
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,{0x10, "OPUS"}
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,{0x14, "FreeBSD/NetBSD/386BSD"}
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,{0x94, "FreeBSD/NetBSD/386BSD"}
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,{0x40, "VENIX 286"}
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,{0x50, "DM"}
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,{0x51, "DM"}
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,{0x52, "CP/M or Microport SysV/AT"}
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,{0x56, "GB"}
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,{0x61, "Speed"}
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,{0x63, "ISC UNIX, other System V/386, GNU HURD or Mach"}
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,{0x64, "Novell Netware 2.xx"}
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,{0x65, "Novell Netware 3.xx"}
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,{0x75, "PCIX"}
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,{0x40, "Minix"}
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};
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static void print_s0(int which);
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static void print_part(int i);
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static void init_sector0(unsigned long start);
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static void init_boot(void);
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static void change_part(int i);
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static void print_params(void);
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static void change_active(int which);
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static void change_code(void);
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static void get_params_to_use(void);
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static char *get_rootdisk(void);
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static void dos(u_int32_t start, u_int32_t size, struct pc98_partition *partp);
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static int open_disk(int flag);
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static ssize_t read_disk(off_t sector, void *buf);
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static int write_disk(off_t sector, void *buf);
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static int get_params(void);
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static int read_s0(void);
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static int write_s0(void);
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static int ok(const char *str);
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static int decimal(const char *str, int *num, int deflt);
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static const char *get_type(int type);
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static void usage(void);
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static int string(const char *str, char **ans);
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int
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main(int argc, char *argv[])
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{
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struct stat sb;
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int c, i;
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int partition = -1;
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struct pc98_partition *partp;
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while ((c = getopt(argc, argv, "Ba:f:istuv12345678")) != -1)
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switch (c) {
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case 'B':
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B_flag = 1;
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break;
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case 'a':
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a_flag = 1;
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break;
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case 'f':
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f_flag = optarg;
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break;
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case 'i':
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i_flag = 1;
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break;
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case 's':
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s_flag = 1;
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break;
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case 't':
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t_flag = 1;
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break;
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case 'u':
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u_flag = 1;
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break;
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case 'v':
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v_flag = 1;
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break;
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case '1':
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case '2':
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case '3':
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case '4':
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case '5':
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case '6':
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case '7':
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case '8':
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partition = c - '0';
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break;
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default:
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usage();
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}
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if (f_flag || i_flag)
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u_flag = 1;
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if (t_flag)
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v_flag = 1;
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argc -= optind;
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argv += optind;
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if (argc == 0) {
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disk = get_rootdisk();
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} else {
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if (stat(argv[0], &sb) == 0) {
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/* OK, full pathname given */
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disk = argv[0];
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} else if (errno == ENOENT && argv[0][0] != '/') {
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/* Try prepending "/dev" */
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asprintf(&disk, "%s%s", _PATH_DEV, argv[0]);
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if (disk == NULL)
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errx(1, "out of memory");
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} else {
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/* other stat error, let it fail below */
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disk = argv[0];
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}
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}
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if (open_disk(u_flag) < 0)
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err(1, "cannot open disk %s", disk);
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if (s_flag) {
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if (read_s0())
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err(1, "read_s0");
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printf("%s: %d cyl %d hd %d sec\n", disk, dos_cyls, dos_heads,
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dos_sectors);
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printf("Part %11s %11s SID\n", "Start", "Size");
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for (i = 0; i < NDOSPART; i++) {
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partp = ((struct pc98_partition *) &mboot.parts) + i;
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if (partp->dp_sid == 0)
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continue;
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printf("%4d: %11u %11u 0x%02x\n", i + 1,
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partp->dp_scyl * cylsecs,
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(partp->dp_ecyl - partp->dp_scyl + 1) * cylsecs,
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partp->dp_sid);
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}
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exit(0);
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}
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printf("******* Working on device %s *******\n",disk);
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if (f_flag) {
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if (v_flag)
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print_s0(-1);
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if (!t_flag)
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write_s0();
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} else {
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if(u_flag)
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get_params_to_use();
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else
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print_params();
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if (read_s0())
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init_sector0(dos_sectors);
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printf("Media sector size is %d\n", secsize);
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printf("Warning: BIOS sector numbering starts with sector 1\n");
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printf("Information from DOS bootblock is:\n");
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if (partition == -1)
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for (i = 1; i <= NDOSPART; i++)
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change_part(i);
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else
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change_part(partition);
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if (u_flag || a_flag)
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change_active(partition);
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if (B_flag)
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change_code();
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if (u_flag || a_flag || B_flag) {
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if (!t_flag) {
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printf("\nWe haven't changed the partition table yet. ");
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printf("This is your last chance.\n");
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}
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print_s0(-1);
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if (!t_flag) {
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if (ok("Should we write new partition table?"))
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write_s0();
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} else {
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printf("\n-t flag specified -- partition table not written.\n");
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}
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}
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}
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exit(0);
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}
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static void
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usage()
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{
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fprintf(stderr, "%s%s",
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"usage: fdisk [-Baistu] [-12345678] [disk]\n",
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" fdisk -f configfile [-itv] [disk]\n");
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exit(1);
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}
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static void
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print_s0(int which)
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{
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int i;
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print_params();
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printf("Information from DOS bootblock is:\n");
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if (which == -1)
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for (i = 1; i <= NDOSPART; i++)
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printf("%d: ", i), print_part(i);
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else
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print_part(which);
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}
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static struct pc98_partition mtpart;
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static void
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print_part(int i)
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{
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struct pc98_partition *partp;
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u_int64_t part_sz, part_mb;
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partp = ((struct pc98_partition *) &mboot.parts) + i - 1;
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if (!bcmp(partp, &mtpart, sizeof (struct pc98_partition))) {
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printf("<UNUSED>\n");
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return;
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}
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/*
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* Be careful not to overflow.
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*/
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part_sz = (partp->dp_ecyl - partp->dp_scyl + 1) * cylsecs;
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part_mb = part_sz * secsize;
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part_mb /= (1024 * 1024);
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printf("sysmid %d (%#04x),(%s)\n", partp->dp_mid, partp->dp_mid,
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get_type(partp->dp_mid));
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printf(" start %lu, size %lu (%ju Meg), sid %d\n",
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(u_long)(partp->dp_scyl * cylsecs), (u_long)part_sz,
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(uintmax_t)part_mb, partp->dp_sid);
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printf("\tbeg: cyl %d/ head %d/ sector %d;\n\tend: cyl %d/ head %d/ sector %d\n"
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,partp->dp_scyl
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,partp->dp_shd
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,partp->dp_ssect
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,partp->dp_ecyl
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,partp->dp_ehd
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,partp->dp_esect);
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printf ("\tsystem Name %.16s\n", partp->dp_name);
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}
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static void
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init_boot(void)
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{
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mboot.signature = DOSMAGIC;
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}
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static void
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init_sector0(unsigned long start)
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{
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struct pc98_partition *partp =
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(struct pc98_partition *)(&mboot.parts[0]);
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init_boot();
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partp->dp_mid = DOSMID_386BSD;
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partp->dp_sid = DOSSID_386BSD;
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dos(start, disksecs - start, partp);
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}
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static void
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change_part(int i)
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{
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struct pc98_partition *partp =
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((struct pc98_partition *) &mboot.parts) + i - 1;
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printf("The data for partition %d is:\n", i);
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print_part(i);
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if (u_flag && ok("Do you want to change it?")) {
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int tmp;
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if (i_flag) {
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bzero((char *)partp, sizeof (struct pc98_partition));
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if (i == 1) {
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init_sector0(1);
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printf("\nThe static data for the slice 1 has been reinitialized to:\n");
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print_part(i);
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}
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}
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do {
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int x_start = partp->dp_scyl * cylsecs ;
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int x_size = (partp->dp_ecyl - partp->dp_scyl + 1) * cylsecs;
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Decimal("sysmid", partp->dp_mid, tmp);
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Decimal("syssid", partp->dp_sid, tmp);
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String ("system name", partp->dp_name, 16);
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Decimal("start", x_start, tmp);
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Decimal("size", x_size, tmp);
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if (ok("Explicitly specify beg/end address ?"))
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{
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int tsec,tcyl,thd;
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tcyl = partp->dp_scyl;
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thd = partp->dp_shd;
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tsec = partp->dp_ssect;
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Decimal("beginning cylinder", tcyl, tmp);
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Decimal("beginning head", thd, tmp);
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Decimal("beginning sector", tsec, tmp);
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partp->dp_scyl = tcyl;
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partp->dp_ssect = tsec;
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partp->dp_shd = thd;
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partp->dp_ipl_cyl = partp->dp_scyl;
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partp->dp_ipl_sct = partp->dp_ssect;
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partp->dp_ipl_head = partp->dp_shd;
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tcyl = partp->dp_ecyl;
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thd = partp->dp_ehd;
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tsec = partp->dp_esect;
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Decimal("ending cylinder", tcyl, tmp);
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Decimal("ending head", thd, tmp);
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Decimal("ending sector", tsec, tmp);
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partp->dp_ecyl = tcyl;
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partp->dp_esect = tsec;
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partp->dp_ehd = thd;
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} else
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dos(x_start, x_size, partp);
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print_part(i);
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} while (!ok("Are we happy with this entry?"));
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}
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}
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static void
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print_params()
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{
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printf("parameters extracted from in-core disklabel are:\n");
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printf("cylinders=%d heads=%d sectors/track=%d (%d blks/cyl)\n\n"
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,cyls,heads,sectors,cylsecs);
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if (dos_cyls > 65535 || dos_heads > 255 || dos_sectors > 255)
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printf("Figures below won't work with BIOS for partitions not in cyl 1\n");
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printf("parameters to be used for BIOS calculations are:\n");
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printf("cylinders=%d heads=%d sectors/track=%d (%d blks/cyl)\n\n"
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,dos_cyls,dos_heads,dos_sectors,dos_cylsecs);
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}
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static void
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change_active(int which)
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{
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struct pc98_partition *partp = &mboot.parts[0];
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int active, i, new, tmp;
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active = -1;
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for (i = 0; i < NDOSPART; i++) {
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if ((partp[i].dp_sid & ACTIVE) == 0)
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continue;
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printf("Partition %d is marked active\n", i + 1);
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if (active == -1)
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active = i + 1;
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}
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if (a_flag && which != -1)
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active = which;
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else if (active == -1)
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active = 1;
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if (!ok("Do you want to change the active partition?"))
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return;
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setactive:
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do {
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new = active;
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Decimal("active partition", new, tmp);
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if (new < 1 || new > 8) {
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printf("Active partition number must be in range 1-8."
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" Try again.\n");
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goto setactive;
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}
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active = new;
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} while (!ok("Are you happy with this choice"));
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if (active > 0 && active <= 8)
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partp[active-1].dp_sid |= ACTIVE;
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}
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static void
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change_code()
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{
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if (ok("Do you want to change the boot code?"))
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init_boot();
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}
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void
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get_params_to_use()
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{
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int tmp;
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print_params();
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if (ok("Do you want to change our idea of what BIOS thinks ?"))
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{
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do
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{
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Decimal("BIOS's idea of #cylinders", dos_cyls, tmp);
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Decimal("BIOS's idea of #heads", dos_heads, tmp);
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Decimal("BIOS's idea of #sectors", dos_sectors, tmp);
|
||
dos_cylsecs = dos_heads * dos_sectors;
|
||
print_params();
|
||
}
|
||
while(!ok("Are you happy with this choice"));
|
||
}
|
||
}
|
||
|
||
|
||
/***********************************************\
|
||
* Change real numbers into strange dos numbers *
|
||
\***********************************************/
|
||
static void
|
||
dos(u_int32_t start, u_int32_t size, struct pc98_partition *partp)
|
||
{
|
||
u_int32_t end;
|
||
|
||
if (partp->dp_mid == 0 && partp->dp_sid == 0 &&
|
||
start == 0 && size == 0) {
|
||
memcpy(partp, &mtpart, sizeof(*partp));
|
||
return;
|
||
}
|
||
|
||
/* Start c/h/s. */
|
||
partp->dp_scyl = partp->dp_ipl_cyl = start / dos_cylsecs;
|
||
partp->dp_shd = partp->dp_ipl_head = start % dos_cylsecs / dos_sectors;
|
||
partp->dp_ssect = partp->dp_ipl_sct = start % dos_sectors;
|
||
|
||
/* End c/h/s. */
|
||
end = start + size - cylsecs;
|
||
partp->dp_ecyl = end / dos_cylsecs;
|
||
partp->dp_ehd = end % dos_cylsecs / dos_sectors;
|
||
partp->dp_esect = end % dos_sectors;
|
||
}
|
||
|
||
static int
|
||
open_disk(int flag)
|
||
{
|
||
struct stat st;
|
||
int rwmode;
|
||
|
||
if (stat(disk, &st) == -1) {
|
||
if (errno == ENOENT)
|
||
return -2;
|
||
warnx("can't get file status of %s", disk);
|
||
return -1;
|
||
}
|
||
if ( !(st.st_mode & S_IFCHR) )
|
||
warnx("device %s is not character special", disk);
|
||
rwmode = a_flag || B_flag || flag ? O_RDWR : O_RDONLY;
|
||
fd = open(disk, rwmode);
|
||
if (fd == -1 && errno == EPERM && rwmode == O_RDWR)
|
||
fd = open(disk, O_RDONLY);
|
||
if (fd == -1 && errno == ENXIO)
|
||
return -2;
|
||
if (fd == -1) {
|
||
warnx("can't open device %s", disk);
|
||
return -1;
|
||
}
|
||
if (get_params() == -1) {
|
||
warnx("can't get disk parameters on %s", disk);
|
||
return -1;
|
||
}
|
||
return fd;
|
||
}
|
||
|
||
static ssize_t
|
||
read_disk(off_t sector, void *buf)
|
||
{
|
||
|
||
lseek(fd, (sector * 512), 0);
|
||
return read(fd, buf,
|
||
secsize > MIN_SEC_SIZE ? secsize : MIN_SEC_SIZE * 2);
|
||
}
|
||
|
||
static int
|
||
write_disk(off_t sector, void *buf)
|
||
{
|
||
int error;
|
||
struct gctl_req *grq;
|
||
const char *q;
|
||
char fbuf[BUFSIZ];
|
||
int i, fdw;
|
||
|
||
grq = gctl_get_handle();
|
||
gctl_ro_param(grq, "verb", -1, "write PC98");
|
||
gctl_ro_param(grq, "class", -1, "PC98");
|
||
q = strrchr(disk, '/');
|
||
if (q == NULL)
|
||
q = disk;
|
||
else
|
||
q++;
|
||
gctl_ro_param(grq, "geom", -1, q);
|
||
gctl_ro_param(grq, "data", secsize, buf);
|
||
q = gctl_issue(grq);
|
||
if (q == NULL) {
|
||
gctl_free(grq);
|
||
return(0);
|
||
}
|
||
warnx("%s", q);
|
||
gctl_free(grq);
|
||
|
||
error = pwrite(fd, buf, secsize, (sector * 512));
|
||
if (error == secsize)
|
||
return (0);
|
||
|
||
for (i = 0; i < NDOSPART; i++) {
|
||
sprintf(fbuf, "%ss%d", disk, i + 1);
|
||
fdw = open(fbuf, O_RDWR, 0);
|
||
if (fdw < 0)
|
||
continue;
|
||
error = ioctl(fdw, DIOCSPC98, buf);
|
||
close(fdw);
|
||
if (error == 0)
|
||
return (0);
|
||
}
|
||
warnx("Failed to write sector zero");
|
||
return(EINVAL);
|
||
}
|
||
|
||
static int
|
||
get_params()
|
||
{
|
||
int error;
|
||
u_int u;
|
||
off_t o;
|
||
|
||
error = ioctl(fd, DIOCGFWSECTORS, &u);
|
||
if (error == 0)
|
||
sectors = dos_sectors = u;
|
||
else
|
||
sectors = dos_sectors = 17;
|
||
|
||
error = ioctl(fd, DIOCGFWHEADS, &u);
|
||
if (error == 0)
|
||
heads = dos_heads = u;
|
||
else
|
||
heads = dos_heads = 8;
|
||
|
||
dos_cylsecs = cylsecs = heads * sectors;
|
||
disksecs = cyls * heads * sectors;
|
||
|
||
error = ioctl(fd, DIOCGSECTORSIZE, &u);
|
||
if (error != 0 || u == 0)
|
||
u = 512;
|
||
secsize = u;
|
||
|
||
error = ioctl(fd, DIOCGMEDIASIZE, &o);
|
||
if (error == 0) {
|
||
disksecs = o / u;
|
||
cyls = dos_cyls = o / (u * dos_heads * dos_sectors);
|
||
}
|
||
|
||
return (disksecs);
|
||
}
|
||
|
||
|
||
static int
|
||
read_s0()
|
||
{
|
||
|
||
if (read_disk(0, (char *) mboot.bootinst) == -1) {
|
||
warnx("can't read fdisk partition table");
|
||
return -1;
|
||
}
|
||
if (mboot.signature != DOSMAGIC) {
|
||
warnx("invalid fdisk partition table found");
|
||
/* So should we initialize things */
|
||
return -1;
|
||
}
|
||
|
||
return 0;
|
||
}
|
||
|
||
static int
|
||
write_s0()
|
||
{
|
||
|
||
if (iotest) {
|
||
print_s0(-1);
|
||
return 0;
|
||
}
|
||
|
||
/*
|
||
* write enable label sector before write (if necessary),
|
||
* disable after writing.
|
||
* needed if the disklabel protected area also protects
|
||
* sector 0. (e.g. empty disk)
|
||
*/
|
||
if (write_disk(0, (char *) mboot.bootinst) == -1) {
|
||
warn("can't write fdisk partition table");
|
||
return -1;
|
||
}
|
||
|
||
return(0);
|
||
}
|
||
|
||
|
||
static int
|
||
ok(const char *str)
|
||
{
|
||
printf("%s [n] ", str);
|
||
fflush(stdout);
|
||
if (fgets(lbuf, LBUF, stdin) == NULL)
|
||
exit(1);
|
||
lbuf[strlen(lbuf)-1] = 0;
|
||
|
||
if (*lbuf &&
|
||
(!strcmp(lbuf, "yes") || !strcmp(lbuf, "YES") ||
|
||
!strcmp(lbuf, "y") || !strcmp(lbuf, "Y")))
|
||
return 1;
|
||
else
|
||
return 0;
|
||
}
|
||
|
||
static int
|
||
decimal(const char *str, int *num, int deflt)
|
||
{
|
||
int acc = 0, c;
|
||
char *cp;
|
||
|
||
while (1) {
|
||
printf("Supply a decimal value for \"%s\" [%d] ", str, deflt);
|
||
fflush(stdout);
|
||
if (fgets(lbuf, LBUF, stdin) == NULL)
|
||
exit(1);
|
||
lbuf[strlen(lbuf)-1] = 0;
|
||
|
||
if (!*lbuf)
|
||
return 0;
|
||
|
||
cp = lbuf;
|
||
while ((c = *cp) && (c == ' ' || c == '\t')) cp++;
|
||
if (!c)
|
||
return 0;
|
||
while ((c = *cp++)) {
|
||
if (c <= '9' && c >= '0')
|
||
acc = acc * 10 + c - '0';
|
||
else
|
||
break;
|
||
}
|
||
if (c == ' ' || c == '\t')
|
||
while ((c = *cp) && (c == ' ' || c == '\t')) cp++;
|
||
if (!c) {
|
||
*num = acc;
|
||
return 1;
|
||
} else
|
||
printf("%s is an invalid decimal number. Try again.\n",
|
||
lbuf);
|
||
}
|
||
|
||
}
|
||
|
||
static int
|
||
string(const char *str, char **ans)
|
||
{
|
||
int i, c;
|
||
char *cp = lbuf;
|
||
|
||
while (1) {
|
||
printf("Supply a string value for \"%s\" [%s] ", str, *ans);
|
||
fgets(lbuf, LBUF, stdin);
|
||
lbuf[strlen(lbuf)-1] = 0;
|
||
|
||
if (!*lbuf)
|
||
return 0;
|
||
|
||
while ((c = *cp) && (c == ' ' || c == '\t')) cp++;
|
||
if (c == '"') {
|
||
c = *++cp;
|
||
*ans = cp;
|
||
while ((c = *cp) && c != '"') cp++;
|
||
} else {
|
||
*ans = cp;
|
||
while ((c = *cp) && c != ' ' && c != '\t') cp++;
|
||
}
|
||
|
||
for (i = strlen(*ans); i < 16; i++)
|
||
(*ans)[i] = ' ';
|
||
(*ans)[16] = 0;
|
||
|
||
return 1;
|
||
}
|
||
}
|
||
|
||
static const char *
|
||
get_type(int type)
|
||
{
|
||
int numentries = (sizeof(part_types)/sizeof(struct part_type));
|
||
int counter = 0;
|
||
struct part_type *ptr = part_types;
|
||
|
||
|
||
while(counter < numentries) {
|
||
if(ptr->type == (type & 0x7f))
|
||
return(ptr->name);
|
||
ptr++;
|
||
counter++;
|
||
}
|
||
return("unknown");
|
||
}
|
||
|
||
/*
|
||
* Try figuring out the root device's canonical disk name.
|
||
* The following choices are considered:
|
||
* /dev/ad0s1a => /dev/ad0
|
||
* /dev/da0a => /dev/da0
|
||
* /dev/vinum/root => /dev/vinum/root
|
||
*/
|
||
static char *
|
||
get_rootdisk(void)
|
||
{
|
||
struct statfs rootfs;
|
||
regex_t re;
|
||
#define NMATCHES 2
|
||
regmatch_t rm[NMATCHES];
|
||
char *s;
|
||
int rv;
|
||
|
||
if (statfs("/", &rootfs) == -1)
|
||
err(1, "statfs(\"/\")");
|
||
|
||
if ((rv = regcomp(&re, "^(/dev/[a-z]+[0-9]+)([sp][0-9]+)?[a-h]?$",
|
||
REG_EXTENDED)) != 0)
|
||
errx(1, "regcomp() failed (%d)", rv);
|
||
if ((rv = regexec(&re, rootfs.f_mntfromname, NMATCHES, rm, 0)) != 0)
|
||
errx(1,
|
||
"mounted root fs resource doesn't match expectations (regexec returned %d)",
|
||
rv);
|
||
if ((s = malloc(rm[1].rm_eo - rm[1].rm_so + 1)) == NULL)
|
||
errx(1, "out of memory");
|
||
memcpy(s, rootfs.f_mntfromname + rm[1].rm_so,
|
||
rm[1].rm_eo - rm[1].rm_so);
|
||
s[rm[1].rm_eo - rm[1].rm_so] = 0;
|
||
|
||
return s;
|
||
}
|