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* Copyright (C) 2008 Karel Zak <>
* Inspired by libvolume_id by
* Kay Sievers <>
* This file may be redistributed under the terms of the
* GNU Lesser General Public License.
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <ctype.h>
#include <stdint.h>
#include <stddef.h>
#include "superblocks.h"
struct ufs_super_block {
uint32_t fs_link;
uint32_t fs_rlink;
uint32_t fs_sblkno;
uint32_t fs_cblkno;
uint32_t fs_iblkno;
uint32_t fs_dblkno;
uint32_t fs_cgoffset;
uint32_t fs_cgmask;
uint32_t fs_time;
uint32_t fs_size;
uint32_t fs_dsize;
uint32_t fs_ncg;
uint32_t fs_bsize;
uint32_t fs_fsize;
uint32_t fs_frag;
uint32_t fs_minfree;
uint32_t fs_rotdelay;
uint32_t fs_rps;
uint32_t fs_bmask;
uint32_t fs_fmask;
uint32_t fs_bshift;
uint32_t fs_fshift;
uint32_t fs_maxcontig;
uint32_t fs_maxbpg;
uint32_t fs_fragshift;
uint32_t fs_fsbtodb;
uint32_t fs_sbsize;
uint32_t fs_csmask;
uint32_t fs_csshift;
uint32_t fs_nindir;
uint32_t fs_inopb;
uint32_t fs_nspf;
uint32_t fs_optim;
uint32_t fs_npsect_state;
uint32_t fs_interleave;
uint32_t fs_trackskew;
uint32_t fs_id[2];
uint32_t fs_csaddr;
uint32_t fs_cssize;
uint32_t fs_cgsize;
uint32_t fs_ntrak;
uint32_t fs_nsect;
uint32_t fs_spc;
uint32_t fs_ncyl;
uint32_t fs_cpg;
uint32_t fs_ipg;
uint32_t fs_fpg;
struct ufs_csum {
uint32_t cs_ndir;
uint32_t cs_nbfree;
uint32_t cs_nifree;
uint32_t cs_nffree;
} fs_cstotal;
int8_t fs_fmod;
int8_t fs_clean;
int8_t fs_ronly;
int8_t fs_flags;
union {
struct {
int8_t fs_fsmnt[512];
uint32_t fs_cgrotor;
uint32_t fs_csp[31];
uint32_t fs_maxcluster;
uint32_t fs_cpc;
uint16_t fs_opostbl[16][8];
} fs_u1;
struct {
int8_t fs_fsmnt[468];
uint8_t fs_volname[32];
uint64_t fs_swuid;
int32_t fs_pad;
uint32_t fs_cgrotor;
uint32_t fs_ocsp[28];
uint32_t fs_contigdirs;
uint32_t fs_csp;
uint32_t fs_maxcluster;
uint32_t fs_active;
int32_t fs_old_cpc;
int32_t fs_maxbsize;
int64_t fs_sparecon64[17];
int64_t fs_sblockloc;
struct ufs2_csum_total {
uint64_t cs_ndir;
uint64_t cs_nbfree;
uint64_t cs_nifree;
uint64_t cs_nffree;
uint64_t cs_numclusters;
uint64_t cs_spare[3];
} fs_cstotal;
struct ufs_timeval {
int32_t tv_sec;
int32_t tv_usec;
} fs_time;
int64_t fs_size;
int64_t fs_dsize;
uint64_t fs_csaddr;
int64_t fs_pendingblocks;
int32_t fs_pendinginodes;
} __attribute__((packed)) fs_u2;
} fs_u11;
union {
struct {
int32_t fs_sparecon[53];
int32_t fs_reclaim;
int32_t fs_sparecon2[1];
int32_t fs_state;
uint32_t fs_qbmask[2];
uint32_t fs_qfmask[2];
} fs_sun;
struct {
int32_t fs_sparecon[53];
int32_t fs_reclaim;
int32_t fs_sparecon2[1];
uint32_t fs_npsect;
uint32_t fs_qbmask[2];
uint32_t fs_qfmask[2];
} fs_sunx86;
struct {
int32_t fs_sparecon[50];
int32_t fs_contigsumsize;
int32_t fs_maxsymlinklen;
int32_t fs_inodefmt;
uint32_t fs_maxfilesize[2];
uint32_t fs_qbmask[2];
uint32_t fs_qfmask[2];
int32_t fs_state;
} fs_44;
} fs_u2;
int32_t fs_postblformat;
int32_t fs_nrpos;
int32_t fs_postbloff;
int32_t fs_rotbloff;
uint32_t fs_magic;
uint8_t fs_space[1];
} __attribute__((packed));
#define UFS_MAGIC 0x00011954
#define UFS2_MAGIC 0x19540119
#define UFS_MAGIC_FEA 0x00195612
#define UFS_MAGIC_LFN 0x00095014
#define UFS_MAGIC_SEC 0x00612195
#define UFS_MAGIC_4GB 0x05231994
static int probe_ufs(blkid_probe pr,
const struct blkid_idmag *mag __attribute__((__unused__)))
int offsets[] = { 0, 8, 64, 256 };
uint32_t mags[] = {
size_t i;
uint32_t magic;
struct ufs_super_block *ufs;
int is_be;
for (i = 0; i < ARRAY_SIZE(offsets); i++) {
uint32_t magLE, magBE;
size_t y;
ufs = (struct ufs_super_block *)
offsets[i] * 1024,
sizeof(struct ufs_super_block));
if (!ufs)
return -1;
magBE = be32_to_cpu(ufs->fs_magic);
magLE = le32_to_cpu(ufs->fs_magic);
for (y = 0; y < ARRAY_SIZE(mags); y++) {
if (magLE == mags[y] || magBE == mags[y]) {
magic = mags[y];
is_be = (magBE == mags[y]);
goto found;
return 1;
if (magic == UFS2_MAGIC) {
blkid_probe_set_version(pr, "2");
blkid_probe_set_label(pr, ufs->fs_u11.fs_u2.fs_volname,
} else
blkid_probe_set_version(pr, "1");
if (ufs->fs_id[0] || ufs->fs_id[1])
if (is_be)
(unsigned char *) &ufs->fs_id,
(unsigned char *) &ufs->fs_id,
if (blkid_probe_set_magic(pr,
(offsets[i] * 1024) +
offsetof(struct ufs_super_block, fs_magic),
(unsigned char *) &ufs->fs_magic))
return -1;
return 0;
* According to libvolume_id the UFS superblock could be on four positions.
* The original libblkid has checked one position (.kboff=8) only.
* We know four UFS magic strings and UFS could be both little-endian and
* big-endian. ... so we have:
* 4 position * 4 string * 2 version = 32 magic strings
* It seems simpler to check for these string in probing function that hardcode
* all in the .magic array.
const struct blkid_idinfo ufs_idinfo =
.name = "ufs",
.probefunc = probe_ufs,