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Reorganize write_mbr() function to be able write bootcode with different

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ways. Improve error reporting and also fix indenting.
Now we are trying to write bootcode:
 1. Directly to provider (if we can open it for writing);
 2. Via GEOM_PART (if it is available);
 3. Via GEOM_MBR.

MFC after:	2 weeks
This commit is contained in:
Andrey V. Elsukov 2011-11-07 09:21:18 +00:00
parent b06ce6855c
commit 7411f128dd
1 changed files with 80 additions and 51 deletions
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131
usr.sbin/boot0cfg/boot0cfg.c
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@ -96,6 +96,7 @@ static const char fmt0[] = "# flag start chs type"
static const char fmt1[] = "%d 0x%02x %4u:%3u:%2u 0x%02x"
" %4u:%3u:%2u %10u %10u\n";
static int geom_class_available(const char *);
static int read_mbr(const char *, u_int8_t **, int);
static void write_mbr(const char *, int, u_int8_t *, int);
static void display_mbr(u_int8_t *);
@ -337,67 +338,95 @@ read_mbr(const char *disk, u_int8_t **mbr, int check_version)
return sizeof(buf);
}
static int
geom_class_available(const char *name)
{
struct gclass *class;
struct gmesh mesh;
int error;
error = geom_gettree(&mesh);
if (error != 0)
errc(1, error, "Cannot get GEOM tree");
LIST_FOREACH(class, &mesh.lg_class, lg_class) {
if (strcmp(class->lg_name, name) == 0) {
geom_deletetree(&mesh);
return (1);
}
}
geom_deletetree(&mesh);
return (0);
}
/*
* Write out the mbr to the specified file.
*/
static void
write_mbr(const char *fname, int flags, u_int8_t *mbr, int mbr_size)
{
int fd;
ssize_t n;
const char *errmsg;
char *pname;
struct gctl_req *grq;
fd = open(fname, O_WRONLY | flags, 0666);
if (fd != -1) {
n = write(fd, mbr, mbr_size);
close(fd);
if (n != mbr_size)
errx(1, "%s: short write", fname);
return;
}
struct gctl_req *grq;
const char *errmsg;
char *pname;
ssize_t n;
int fd;
/*
* If we're called to write to a backup file, don't try to
* write through GEOM. It only generates additional errors.
*/
if (flags != 0)
return;
fd = open(fname, O_WRONLY | flags, 0666);
if (fd != -1) {
n = write(fd, mbr, mbr_size);
close(fd);
if (n != mbr_size)
errx(1, "%s: short write", fname);
return;
}
/* Try open it read only. */
fd = open(fname, O_RDONLY);
if (fd == -1) {
warn("error opening %s", fname);
return;
}
pname = g_providername(fd);
if (pname == NULL) {
warn("error getting providername for %s", fname);
return;
}
grq = gctl_get_handle();
gctl_ro_param(grq, "class", -1, "PART");
gctl_ro_param(grq, "arg0", -1, pname);
gctl_ro_param(grq, "verb", -1, "bootcode");
gctl_ro_param(grq, "bootcode", mbr_size, mbr);
gctl_ro_param(grq, "flags", -1, "C");
errmsg = gctl_issue(grq);
if (errmsg == NULL)
goto out;
/*
* If we're called to write to a backup file, don't try to
* write through GEOM.
*/
if (flags != 0)
err(1, "can't open file %s to write backup", fname);
grq = gctl_get_handle();
gctl_ro_param(grq, "verb", -1, "write MBR");
gctl_ro_param(grq, "class", -1, "MBR");
gctl_ro_param(grq, "geom", -1, pname);
gctl_ro_param(grq, "data", mbr_size, mbr);
errmsg = gctl_issue(grq);
if (errmsg != NULL)
err(1, "write_mbr: %s", fname);
/* Try open it read only. */
fd = open(fname, O_RDONLY);
if (fd == -1) {
warn("error opening %s", fname);
return;
}
out:
free(pname);
gctl_free(grq);
pname = g_providername(fd);
if (pname == NULL) {
warn("error getting providername for %s", fname);
return;
}
/* First check that GEOM_PART is available */
if (geom_class_available("PART") != 0) {
grq = gctl_get_handle();
gctl_ro_param(grq, "class", -1, "PART");
gctl_ro_param(grq, "arg0", -1, pname);
gctl_ro_param(grq, "verb", -1, "bootcode");
gctl_ro_param(grq, "bootcode", mbr_size, mbr);
gctl_ro_param(grq, "flags", -1, "C");
errmsg = gctl_issue(grq);
if (errmsg != NULL && errmsg[0] != '\0')
errx(1, "GEOM_PART: write bootcode to %s failed: %s",
fname, errmsg);
gctl_free(grq);
} else if (geom_class_available("MBR") != 0) {
grq = gctl_get_handle();
gctl_ro_param(grq, "verb", -1, "write MBR");
gctl_ro_param(grq, "class", -1, "MBR");
gctl_ro_param(grq, "geom", -1, pname);
gctl_ro_param(grq, "data", mbr_size, mbr);
errmsg = gctl_issue(grq);
if (errmsg != NULL)
err(1, "GEOM_MBR: write MBR to %s failed", fname);
gctl_free(grq);
} else
errx(1, "can't write MBR to %s", fname);
free(pname);
}
/*