| #include <stdio.h> |
| #include "partx.h" |
| |
| #define BSD_DISKMAGIC (0x82564557UL) /* The disk magic number */ |
| #define XBSD_MAXPARTITIONS 16 |
| #define BSD_FS_UNUSED 0 |
| |
| struct bsd_disklabel { |
| unsigned int d_magic; /* the magic number */ |
| short int d_type; /* drive type */ |
| short int 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 */ |
| unsigned int d_drivedata[5]; /* drive-type specific information */ |
| unsigned int d_spare[5]; /* 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[XBSD_MAXPARTITIONS];/* actually may be more */ |
| }; |
| |
| int |
| read_bsd_pt(int fd, struct slice all, struct slice *sp, int ns) { |
| struct bsd_disklabel *l; |
| struct bsd_partition *p; |
| unsigned int offset = all.start; |
| int max_partitions; |
| unsigned char *bp; |
| int n = 0; |
| |
| bp = getblock(fd, offset+1); /* 1 sector suffices */ |
| if (bp == NULL) |
| return -1; |
| |
| l = (struct bsd_disklabel *) bp; |
| if (l->d_magic != BSD_DISKMAGIC) |
| return -1; |
| |
| max_partitions = 16; |
| if (l->d_npartitions < max_partitions) |
| max_partitions = l->d_npartitions; |
| for (p = l->d_partitions; p - l->d_partitions < max_partitions; p++) { |
| if (p->p_fstype == BSD_FS_UNUSED) |
| /* nothing */; |
| else if (n < ns) { |
| sp[n].start = p->p_offset; |
| sp[n].size = p->p_size; |
| n++; |
| } else { |
| fprintf(stderr, |
| "bsd_partition: too many slices\n"); |
| break; |
| } |
| } |
| return n; |
| } |
