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/* Sun style partitioning */
#include <fcntl.h>
#include <unistd.h>
#include "balkan.h"
#define BSD_DISKMAGIC (0x82564557UL) /* The disk magic number */
#define BSD_MAXPARTITIONS 8
#define BSD_FS_UNUSED 0 /* disklabel unused partition entry ID */
#define BSD_LABEL_OFFSET 64
struct bsd_disklabel {
unsigned int d_magic; /* the magic number */
signed short d_type; /* drive type */
signed short d_subtype; /* controller/d_type specific */
char d_typename[16]; /* type name, e.g. "eagle" */
char d_packname[16]; /* pack identifier */
unsigned int d_secsize; /* # of bytes per sector */
unsigned int d_nsectors; /* # of data sectors per track */
unsigned int d_ntracks; /* # of tracks per cylinder */
unsigned int d_ncylinders; /* # of data cylinders per unit */
unsigned int d_secpercyl; /* # of data sectors per cylinder */
unsigned int d_secperunit; /* # of data sectors per unit */
unsigned short d_sparespertrack; /* # of spare sectors per track */
unsigned short d_sparespercyl; /* # of spare sectors per cylinder */
unsigned int d_acylinders; /* # of alt. cylinders per unit */
unsigned short d_rpm; /* rotational speed */
unsigned short d_interleave; /* hardware sector interleave */
unsigned short d_trackskew; /* sector 0 skew, per track */
unsigned short d_cylskew; /* sector 0 skew, per cylinder */
unsigned int d_headswitch; /* head switch time, usec */
unsigned int d_trkseek; /* track-to-track seek, usec */
unsigned int d_flags; /* generic flags */
#define NDDATA 5
unsigned int d_drivedata[NDDATA]; /* drive-type specific information */
#define NSPARE 5
unsigned int d_spare[NSPARE]; /* reserved for future use */
unsigned int d_magic2; /* the magic number (again) */
unsigned short d_checksum; /* xor of data incl. partitions */
/* filesystem and partition information: */
unsigned short d_npartitions; /* number of partitions in following */
unsigned int d_bbsize; /* size of boot area at sn0, bytes */
unsigned int d_sbsize; /* max size of fs superblock, bytes */
struct bsd_partition { /* the partition table */
unsigned int p_size; /* number of sectors in partition */
unsigned int p_offset; /* starting sector */
unsigned int p_fsize; /* filesystem basic fragment size */
unsigned char p_fstype; /* filesystem type, see below */
unsigned char p_frag; /* filesystem fragments per block */
unsigned short p_cpg; /* filesystem cylinders per group */
} d_partitions[BSD_MAXPARTITIONS]; /* actually may be more */
};
long long llseek(int fd, long long offset, int whence);
#if 0
static unsigned short xbsd_dkcksum (struct bsd_disklabel *lp) {
unsigned short *start, *end;
unsigned short sum = 0;
lp->d_checksum = 0;
start = (u_short *)lp;
end = (u_short *)&lp->d_partitions[lp->d_npartitions];
while (start < end)
sum ^= *start++;
return (sum);
}
#endif
int bsdlReadTable(int fd, struct partitionTable * table) {
struct bsd_disklabel label;
int i, rc;
unsigned short *p, csum;
int s;
table->maxNumPartitions = 8;
for (i = 0; i < table->maxNumPartitions; i++)
table->parts[i].type = -1;
table->sectorSize = 512;
if (lseek(fd, BSD_LABEL_OFFSET, SEEK_SET) < 0)
return BALKAN_ERROR_ERRNO;
if (read(fd, &label, sizeof(label)) != sizeof(label))
return BALKAN_ERROR_ERRNO;
if (label.d_magic != BSD_DISKMAGIC)
return BALKAN_ERROR_BADMAGIC;
#if 0
/* minlabel doens't write checksums :-( */
if (xbsd_dkcksum(&label))
return BALKAN_ERROR_BADMAGIC;
#endif
if (label.d_npartitions > 8)
label.d_npartitions = 8;
for (i = 0; i < label.d_npartitions; i++) {
if (label.d_partitions[i].p_size && label.d_partitions[i].p_fstype) {
table->parts[i].startSector = label.d_partitions[i].p_offset;
table->parts[i].size = label.d_partitions[i].p_size;
switch (label.d_partitions[i].p_fstype) {
case 1: s = BALKAN_PART_SWAP; break;
case 8: s = BALKAN_PART_EXT2; break;
default: s = BALKAN_PART_OTHER; break;
}
table->parts[i].type = s;
}
}
return 0;
}
#ifdef STANDALONE_TEST
void main() {
int fd;
int i;
struct partitionTable table;
fd = open("/dev/hda", O_RDONLY);
printf("rc= %d\n", bsdlReadTable(fd, &table));
for (i = 0; i < table.maxNumPartitions; i++) {
if (table.parts[i].type == -1) continue;
printf("%d: %x %d\n", i, table.parts[i].type, table.parts[i].size);
}
}
#endif
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