4 #define BSD_DISKMAGIC (0x82564557UL) /* The disk magic number */
5 #define XBSD_MAXPARTITIONS 16
6 #define BSD_FS_UNUSED 0
9 unsigned int d_magic; /* the magic number */
10 short int d_type; /* drive type */
11 short int d_subtype; /* controller/d_type specific */
12 char d_typename[16]; /* type name, e.g. "eagle" */
13 char d_packname[16]; /* pack identifier */
14 unsigned int d_secsize; /* # of bytes per sector */
15 unsigned int d_nsectors; /* # of data sectors per track */
16 unsigned int d_ntracks; /* # of tracks per cylinder */
17 unsigned int d_ncylinders; /* # of data cylinders per unit */
18 unsigned int d_secpercyl; /* # of data sectors per cylinder */
19 unsigned int d_secperunit; /* # of data sectors per unit */
20 unsigned short d_sparespertrack;/* # of spare sectors per track */
21 unsigned short d_sparespercyl; /* # of spare sectors per cylinder */
22 unsigned int d_acylinders; /* # of alt. cylinders per unit */
23 unsigned short d_rpm; /* rotational speed */
24 unsigned short d_interleave; /* hardware sector interleave */
25 unsigned short d_trackskew; /* sector 0 skew, per track */
26 unsigned short d_cylskew; /* sector 0 skew, per cylinder */
27 unsigned int d_headswitch; /* head switch time, usec */
28 unsigned int d_trkseek; /* track-to-track seek, usec */
29 unsigned int d_flags; /* generic flags */
30 unsigned int d_drivedata[5]; /* drive-type specific information */
31 unsigned int d_spare[5]; /* reserved for future use */
32 unsigned int d_magic2; /* the magic number (again) */
33 unsigned short d_checksum; /* xor of data incl. partitions */
35 /* filesystem and partition information: */
36 unsigned short d_npartitions; /* number of partitions in following */
37 unsigned int d_bbsize; /* size of boot area at sn0, bytes */
38 unsigned int d_sbsize; /* max size of fs superblock, bytes */
39 struct bsd_partition { /* the partition table */
40 unsigned int p_size; /* number of sectors in partition */
41 unsigned int p_offset; /* starting sector */
42 unsigned int p_fsize; /* filesystem basic fragment size */
43 unsigned char p_fstype; /* filesystem type, see below */
44 unsigned char p_frag; /* filesystem fragments per block */
45 unsigned short p_cpg; /* filesystem cylinders per group */
46 } d_partitions[XBSD_MAXPARTITIONS];/* actually may be more */
50 read_bsd_pt(int fd, struct slice all, struct slice *sp, int ns) {
51 struct bsd_disklabel *l;
52 struct bsd_partition *p;
53 unsigned int offset = all.start;
58 bp = getblock(fd, offset+1); /* 1 sector suffices */
62 l = (struct bsd_disklabel *) bp;
63 if (l->d_magic != BSD_DISKMAGIC)
67 if (l->d_npartitions < max_partitions)
68 max_partitions = l->d_npartitions;
69 for (p = l->d_partitions; p - l->d_partitions < max_partitions; p++) {
70 if (p->p_fstype == BSD_FS_UNUSED)
73 sp[n].start = p->p_offset;
74 sp[n].size = p->p_size;
78 "bsd_partition: too many slices\n");