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135 lines
3.0 KiB
C
135 lines
3.0 KiB
C
/*
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* volume_id - reads filesystem label and uuid
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*
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* Copyright (C) 2005 Kay Sievers <kay.sievers@vrfy.org>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation version 2 of the License.
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*/
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#ifndef _GNU_SOURCE
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#define _GNU_SOURCE 1
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#endif
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <errno.h>
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#include <ctype.h>
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#include "volume_id.h"
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#include "logging.h"
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#include "util.h"
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#define SYSV_NICINOD 100
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#define SYSV_NICFREE 50
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struct sysv_super
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{
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uint16_t s_isize;
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uint16_t s_pad0;
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uint32_t s_fsize;
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uint16_t s_nfree;
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uint16_t s_pad1;
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uint32_t s_free[SYSV_NICFREE];
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uint16_t s_ninode;
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uint16_t s_pad2;
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uint16_t s_inode[SYSV_NICINOD];
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uint8_t s_flock;
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uint8_t s_ilock;
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uint8_t s_fmod;
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uint8_t s_ronly;
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uint32_t s_time;
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uint16_t s_dinfo[4];
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uint32_t s_tfree;
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uint16_t s_tinode;
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uint16_t s_pad3;
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uint8_t s_fname[6];
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uint8_t s_fpack[6];
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uint32_t s_fill[12];
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uint32_t s_state;
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uint32_t s_magic;
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uint32_t s_type;
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} __attribute__((__packed__));
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#define XENIX_NICINOD 100
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#define XENIX_NICFREE 100
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struct xenix_super {
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uint16_t s_isize;
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uint32_t s_fsize;
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uint16_t s_nfree;
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uint32_t s_free[XENIX_NICFREE];
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uint16_t s_ninode;
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uint16_t s_inode[XENIX_NICINOD];
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uint8_t s_flock;
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uint8_t s_ilock;
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uint8_t s_fmod;
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uint8_t s_ronly;
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uint32_t s_time;
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uint32_t s_tfree;
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uint16_t s_tinode;
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uint16_t s_dinfo[4];
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uint8_t s_fname[6];
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uint8_t s_fpack[6];
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uint8_t s_clean;
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uint8_t s_fill[371];
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uint32_t s_magic;
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uint32_t s_type;
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} __attribute__((__packed__));
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#define SYSV_SUPERBLOCK_BLOCK 0x01
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#define SYSV_MAGIC 0xfd187e20
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#define XENIX_SUPERBLOCK_BLOCK 0x18
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#define XENIX_MAGIC 0x2b5544
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#define SYSV_MAX_BLOCKSIZE 0x800
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int volume_id_probe_sysv(struct volume_id *id, uint64_t off)
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{
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struct sysv_super *vs;
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struct xenix_super *xs;
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unsigned int boff;
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dbg("probing at offset 0x%llx", (unsigned long long) off);
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for (boff = 0x200; boff <= SYSV_MAX_BLOCKSIZE; boff <<= 1) {
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vs = (struct sysv_super *)
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volume_id_get_buffer(id, off + (boff * SYSV_SUPERBLOCK_BLOCK), 0x200);
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if (vs == NULL)
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return -1;
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if (vs->s_magic == cpu_to_le32(SYSV_MAGIC) || vs->s_magic == cpu_to_be32(SYSV_MAGIC)) {
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volume_id_set_label_raw(id, vs->s_fname, 6);
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volume_id_set_label_string(id, vs->s_fname, 6);
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id->type = "sysv";
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goto found;
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}
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}
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for (boff = 0x200; boff <= SYSV_MAX_BLOCKSIZE; boff <<= 1) {
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xs = (struct xenix_super *)
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volume_id_get_buffer(id, off + (boff + XENIX_SUPERBLOCK_BLOCK), 0x200);
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if (xs == NULL)
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return -1;
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if (xs->s_magic == cpu_to_le32(XENIX_MAGIC) || xs->s_magic == cpu_to_be32(XENIX_MAGIC)) {
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volume_id_set_label_raw(id, xs->s_fname, 6);
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volume_id_set_label_string(id, xs->s_fname, 6);
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id->type = "xenix";
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goto found;
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}
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}
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return -1;
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found:
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volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
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return 0;
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}
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