1/* 2 * volume_id - reads filesystem label and uuid 3 * 4 * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org> 5 * 6 * This program is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License as published by the 8 * Free Software Foundation version 2 of the License. 9 */ 10 11#ifndef _GNU_SOURCE 12#define _GNU_SOURCE 1 13#endif 14 15#ifdef HAVE_CONFIG_H 16# include <config.h> 17#endif 18 19#include <stdio.h> 20#include <stdlib.h> 21#include <unistd.h> 22#include <string.h> 23#include <errno.h> 24#include <ctype.h> 25 26#include "libvolume_id.h" 27#include "util.h" 28 29#define VXFS_SUPER_MAGIC 0xa501FCF5 30 31struct vxfs_super { 32 uint32_t vs_magic; 33 int32_t vs_version; 34} PACKED; 35 36int volume_id_probe_vxfs(struct volume_id *id, uint64_t off, uint64_t size) 37{ 38 struct vxfs_super *vxs; 39 40 info("probing at offset 0x%llx", (unsigned long long) off); 41 42 vxs = (struct vxfs_super *) volume_id_get_buffer(id, off + 0x200, 0x200); 43 if (vxs == NULL) 44 return -1; 45 46 if (vxs->vs_magic == cpu_to_le32(VXFS_SUPER_MAGIC)) { 47 snprintf(id->type_version, sizeof(id->type_version)-1, "%u", (unsigned int) vxs->vs_version); 48 volume_id_set_usage(id, VOLUME_ID_FILESYSTEM); 49 id->type = "vxfs"; 50 return 0; 51 } 52 53 return -1; 54} 55