diff options
author | phk <phk@FreeBSD.org> | 2002-09-20 09:18:31 +0000 |
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committer | phk <phk@FreeBSD.org> | 2002-09-20 09:18:31 +0000 |
commit | 2f9ce7f609dfad2d63b5ecc1dac003accf2a5758 (patch) | |
tree | 7ccc283573b553325fc84d03c5efb421d0dc3e03 /sbin/bsdlabel/bsdlabel.c | |
parent | a33d7be6d91b82aecdb4f7f084eb48e928ba376e (diff) | |
download | FreeBSD-src-2f9ce7f609dfad2d63b5ecc1dac003accf2a5758.zip FreeBSD-src-2f9ce7f609dfad2d63b5ecc1dac003accf2a5758.tar.gz |
Construct new disklabels based on the medias stated parameters in
userland, rather than expect all possible GEOMetries to know about
BSD disklabels.
Sponsored by: DARPA & NAI Labs
Diffstat (limited to 'sbin/bsdlabel/bsdlabel.c')
-rw-r--r-- | sbin/bsdlabel/bsdlabel.c | 67 |
1 files changed, 47 insertions, 20 deletions
diff --git a/sbin/bsdlabel/bsdlabel.c b/sbin/bsdlabel/bsdlabel.c index 4a364ac..17c24d9 100644 --- a/sbin/bsdlabel/bsdlabel.c +++ b/sbin/bsdlabel/bsdlabel.c @@ -60,6 +60,7 @@ __FBSDID("$FreeBSD$"); #include <sys/file.h> #include <sys/stat.h> #include <sys/wait.h> +#include <sys/disk.h> #define DKTYPENAMES #define FSTYPENAMES #include <sys/disklabel.h> @@ -1573,8 +1574,11 @@ struct disklabel * getvirginlabel(void) { static struct disklabel loclab; + struct partition *dp; char lnamebuf[BBSIZE]; int f; + u_int secsize, u; + off_t mediasize; if (dkname[0] == '/') { warnx("\"auto\" requires the usage of a canonical disk name"); @@ -1586,28 +1590,51 @@ getvirginlabel(void) return (NULL); } - /* - * Try to use the new get-virgin-label ioctl. If it fails, - * fallback to the old get-disdk-info ioctl. - */ - if (ioctl(f, DIOCGDVIRGIN, &loclab) == 0) - goto out; - if (ioctl(f, DIOCGDINFO, &loclab) == 0) - goto out; - close(f); - (void)snprintf(lnamebuf, BBSIZE, "%s%s%c", _PATH_DEV, dkname, - 'a' + RAW_PART); - if ((f = open(lnamebuf, O_RDONLY)) == -1) { - warn("cannot open %s", lnamebuf); + /* New world order */ + if ((ioctl(f, DIOCGMEDIASIZE, &mediasize) != 0) || + (ioctl(f, DIOCGSECTORSIZE, &secsize) != 0)) { + close (f); return (NULL); } - if (ioctl(f, DIOCGDINFO, &loclab) == 0) - goto out; - close(f); - warn("No virgin disklabel found %s", lnamebuf); - return (NULL); - out: - close(f); + memset(&loclab, 0, sizeof loclab); + loclab.d_magic = DISKMAGIC; + loclab.d_magic2 = DISKMAGIC; + loclab.d_secsize = secsize; + loclab.d_secperunit = mediasize / secsize; + + /* + * Nobody in these enligthened days uses the CHS geometry for + * anything, but nontheless try to get it right. If we fail + * to get any good ideas from the device, construct something + * which is IBM-PC friendly. + */ + if (ioctl(f, DIOCGFWSECTORS, &u) == 0) + loclab.d_nsectors = u; + else + loclab.d_nsectors = 63; + if (ioctl(f, DIOCGFWHEADS, &u) == 0) + loclab.d_ntracks = u; + else if (loclab.d_secperunit <= 63*1*1024) + loclab.d_ntracks = 1; + else if (loclab.d_secperunit <= 63*16*1024) + loclab.d_ntracks = 16; + else + loclab.d_ntracks = 255; + loclab.d_secpercyl = loclab.d_ntracks * loclab.d_nsectors; + loclab.d_ncylinders = loclab.d_secperunit / loclab.d_secpercyl; + loclab.d_npartitions = MAXPARTITIONS; + + /* Various (unneeded) compat stuff */ + loclab.d_rpm = 3600; + loclab.d_bbsize = BBSIZE; + loclab.d_interleave = 1;; + strncpy(loclab.d_typename, "amnesiac", + sizeof(loclab.d_typename)); + + dp = &loclab.d_partitions[RAW_PART]; + dp->p_size = loclab.d_secperunit; + loclab.d_checksum = dkcksum(&loclab); + close (f); return (&loclab); } |