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* BSD/OSF partition parsing code
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* Copyright (C) 2009 Karel Zak <kzak@redhat.com>
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* This file may be redistributed under the terms of the
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* GNU Lesser General Public License.
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* Inspired by fdisk, partx, Linux kernel, libparted and openbsd header files.
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#include "partitions.h"
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#define BSD_MAXPARTITIONS 16
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#define BSD_FS_UNUSED 0
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struct bsd_disklabel {
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uint32_t d_magic; /* the magic number */
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int16_t d_type; /* drive type */
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int16_t d_subtype; /* controller/d_type specific */
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char d_typename[16]; /* type name, e.g. "eagle" */
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char d_packname[16]; /* pack identifier */
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uint32_t d_secsize; /* # of bytes per sector */
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uint32_t d_nsectors; /* # of data sectors per track */
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uint32_t d_ntracks; /* # of tracks per cylinder */
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uint32_t d_ncylinders; /* # of data cylinders per unit */
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uint32_t d_secpercyl; /* # of data sectors per cylinder */
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uint32_t d_secperunit; /* # of data sectors per unit */
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* Spares (bad sector replacements) below
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* are not counted in d_nsectors or d_secpercyl.
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* Spare sectors are assumed to be physical sectors
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* which occupy space at the end of each track and/or cylinder.
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uint16_t d_sparespertrack; /* # of spare sectors per track */
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uint16_t d_sparespercyl; /* # of spare sectors per cylinder */
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* Alternate cylinders include maintenance, replacement,
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* configuration description areas, etc.
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uint32_t d_acylinders; /* # of alt. cylinders per unit */
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/* hardware characteristics: */
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* d_interleave, d_trackskew and d_cylskew describe perturbations
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* in the media format used to compensate for a slow controller.
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* Interleave is physical sector interleave, set up by the formatter
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* or controller when formatting. When interleaving is in use,
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* logically adjacent sectors are not physically contiguous,
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* but instead are separated by some number of sectors.
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* It is specified as the ratio of physical sectors traversed
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* per logical sector. Thus an interleave of 1:1 implies contiguous
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* layout, while 2:1 implies that logical sector 0 is separated
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* by one sector from logical sector 1.
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* d_trackskew is the offset of sector 0 on track N
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* relative to sector 0 on track N-1 on the same cylinder.
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* Finally, d_cylskew is the offset of sector 0 on cylinder N
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* relative to sector 0 on cylinder N-1.
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uint16_t d_rpm; /* rotational speed */
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uint16_t d_interleave; /* hardware sector interleave */
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uint16_t d_trackskew; /* sector 0 skew, per track */
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uint16_t d_cylskew; /* sector 0 skew, per cylinder */
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uint32_t d_headswitch; /* head switch time, usec */
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uint32_t d_trkseek; /* track-to-track seek, usec */
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uint32_t d_flags; /* generic flags */
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uint32_t d_drivedata[5]; /* drive-type specific information */
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uint32_t d_spare[5]; /* reserved for future use */
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uint32_t d_magic2; /* the magic number (again) */
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uint16_t d_checksum; /* xor of data incl. partitions */
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/* filesystem and partition information: */
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uint16_t d_npartitions; /* number of partitions in following */
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uint32_t d_bbsize; /* size of boot area at sn0, bytes */
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uint32_t d_sbsize; /* max size of fs superblock, bytes */
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struct bsd_partition { /* the partition table */
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uint32_t p_size; /* number of sectors in partition */
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uint32_t p_offset; /* starting sector */
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uint32_t p_fsize; /* filesystem basic fragment size */
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uint8_t p_fstype; /* filesystem type, see below */
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uint8_t p_frag; /* filesystem fragments per block */
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uint16_t p_cpg; /* filesystem cylinders per group */
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} __attribute__((packed)) d_partitions[BSD_MAXPARTITIONS]; /* actually may be more */
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} __attribute__((packed));
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/* Returns 'blkid_idmag' in 512-sectors */
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#define BLKID_MAG_SECTOR(_mag) (((_mag)->kboff * 2) + ((_mag)->sboff >> 9))
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/* Returns 'blkid_idmag' in bytes */
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#define BLKID_MAG_OFFSET(_mag) ((_mag)->kboff >> 10) + ((_mag)->sboff)
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/* Returns 'blkid_idmag' offset in bytes within the last sector */
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#define BLKID_MAG_LASTOFFSET(_mag) \
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(BLKID_MAG_OFFSET(_mag) - (BLKID_MAG_SECTOR(_mag) << 9))
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static int probe_bsd_pt(blkid_probe pr, const struct blkid_idmag *mag)
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struct bsd_disklabel *l;
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struct bsd_partition *p;
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const char *name = "bsd" ;
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blkid_parttable tab = NULL;
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blkid_partition parent;
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int i, nparts = BSD_MAXPARTITIONS;
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if (blkid_partitions_need_typeonly(pr))
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/* caller does not ask for details about partitions */
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data = blkid_probe_get_sector(pr, BLKID_MAG_SECTOR(mag));
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l = (struct bsd_disklabel *) data + BLKID_MAG_LASTOFFSET(mag);
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ls = blkid_probe_get_partlist(pr);
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/* try to determine the real type of BSD system according to
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* (parental) primary partition */
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parent = blkid_partlist_get_parent(ls);
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switch(blkid_partition_get_type(parent)) {
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case BLKID_FREEBSD_PARTITION:
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case BLKID_NETBSD_PARTITION:
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case BLKID_OPENBSD_PARTITION:
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DBG(DEBUG_LOWPROBE, printf(
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"WARNING: BSD label detected on unknown (0x%x) "
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"primary partition\n",
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blkid_partition_get_type(parent)));
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tab = blkid_partlist_new_parttable(ls, name, BLKID_MAG_OFFSET(mag));
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if (le16_to_cpu(l->d_npartitions) < BSD_MAXPARTITIONS)
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nparts = le16_to_cpu(l->d_npartitions);
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else if (le16_to_cpu(l->d_npartitions) > BSD_MAXPARTITIONS)
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DBG(DEBUG_LOWPROBE, printf(
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"WARNING: ignore %d more BSD partitions\n",
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le16_to_cpu(l->d_npartitions) - BSD_MAXPARTITIONS));
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for (i = 0, p = l->d_partitions; i < nparts; i++, p++) {
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uint32_t start, size;
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/* TODO: in fdisk-mode returns all non-zero (p_size) partitions */
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if (p->p_fstype == BSD_FS_UNUSED)
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start = le32_to_cpu(p->p_offset);
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size = le32_to_cpu(p->p_size);
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if (parent && !blkid_is_nested_dimension(parent, start, size)) {
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DBG(DEBUG_LOWPROBE, printf(
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"WARNING: BSD partition (%d) overflow "
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"detected, ignore\n", i));
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par = blkid_partlist_add_partition(ls, tab, start, size);
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blkid_partition_set_type(par, p->p_fstype);
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* All BSD variants use the same magic string (little-endian),
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* and the same disklabel.
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* The difference between {Free,Open,...}BSD is in the (parental)
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* primary partition type.
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* See also: http://en.wikipedia.org/wiki/BSD_disklabel
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* The location of BSD disk label is architecture specific and in defined by
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* LABELSECTOR and LABELOFFSET macros in the disklabel.h file. The location
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* also depends on BSD variant, FreeBSD uses only one location, NetBSD and
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* OpenBSD are more creative...
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* The basic overview:
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* arch | LABELSECTOR | LABELOFFSET
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* ------------------------+-------------+------------
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* amd64 arm hppa hppa64 | |
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* i386, macppc, mvmeppc | 1 | 0
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* sgi, aviion, sh, socppc | |
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* ------------------------+-------------+------------
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* alpha luna88k mac68k | 0 | 64
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* sparc(OpenBSD) vax | |
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* ------------------------+-------------+------------
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* spark64 sparc(NetBSD) | 0 | 128
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* ------------------------+-------------+------------
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* ...and more (see http://fxr.watson.org/fxr/ident?v=NETBSD;i=LABELSECTOR)
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const struct blkid_idinfo bsd_pt_idinfo =
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.probefunc = probe_bsd_pt,
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{ .magic = "\x57\x45\x56\x82", .len = 4, .sboff = 512 },
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{ .magic = "\x57\x45\x56\x82", .len = 4, .sboff = 64 },
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{ .magic = "\x57\x45\x56\x82", .len = 4, .sboff = 128 },
added
removed
libblkid/src/partitions/bsd.c
