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Attempt gctl verb "write MBR" when updating.

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This should solve the problem of modifying the MBR while running.
This commit is contained in:
Poul-Henning Kamp 2005-07-15 08:04:32 +00:00
parent de78c288db
commit dfa5ad9421
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=148036
2 changed files with 25 additions and 1 deletions
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3
usr.sbin/boot0cfg/Makefile
View File

@ -5,4 +5,7 @@ MAN= boot0cfg.8
WARNS?= 2
DPADD= ${LIBGEOM}
LDADD= -lgeom
.include <bsd.prog.mk>

23
usr.sbin/boot0cfg/boot0cfg.c
View File

@ -35,6 +35,7 @@ __FBSDID("$FreeBSD$");
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <libgeom.h>
#include <paths.h>
#include <stdio.h>
#include <stdlib.h>
@ -256,6 +257,8 @@ write_mbr(const char *fname, int flags, u_int8_t *mbr, int mbr_size)
int fd, p;
ssize_t n;
char *s;
const char *q;
struct gctl_req *grq;
fd = open(fname, O_WRONLY | flags, 0666);
if (fd != -1) {
@ -265,12 +268,30 @@ write_mbr(const char *fname, int flags, u_int8_t *mbr, int mbr_size)
errx(1, "%s: short write", fname);
return;
}
if (flags != 0)
err(1, "%s", fname);
grq = gctl_get_handle();
gctl_ro_param(grq, "verb", -1, "write MBR");
gctl_ro_param(grq, "class", -1, "MBR");
q = strrchr(fname, '/');
if (q == NULL)
q = fname;
else
q++;
gctl_ro_param(grq, "geom", -1, q);
gctl_ro_param(grq, "data", mbr_size, mbr);
q = gctl_issue(grq);
if (q == NULL)
return;
warnx("%s: %s", fname, q);
gctl_free(grq);
#ifdef DIOCSMBR
for (p = 1; p < 5; p++) {
asprintf(&s, "%ss%d", fname, p);
fd = open(s, O_RDWR);
fd = open(s, O_RDONLY);
if (fd < 0) {
free(s);
continue;