volume_id.c revision b5e694267142042228a6cac99ecad6c4b4ef8759
/*
* volume_id - reads volume label and uuid
*
* Copyright (C) 2005 Kay Sievers <kay.sievers@vrfy.org>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation version 2 of the License.
*/
#ifndef _GNU_SOURCE
#define _GNU_SOURCE 1
#endif
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <errno.h>
#include <ctype.h>
#include <fcntl.h>
#include <sys/stat.h>
#include "libvolume_id.h"
#include "util.h"
/* the user can overwrite this log function */
static void default_log(int priority, const char *file, int line, const char *format, ...)
{
return;
}
volume_id_log_fn volume_id_log = default_log;
int volume_id_probe_raid(struct volume_id *id, uint64_t off, uint64_t size)
{
if (id == NULL)
return -EINVAL;
/* probe for raid first, cause fs probes may be successful on raid members */
if (size) {
if (volume_id_probe_linux_raid(id, off, size) == 0)
goto found;
if (volume_id_probe_intel_software_raid(id, off, size) == 0)
goto found;
if (volume_id_probe_lsi_mega_raid(id, off, size) == 0)
goto found;
if (volume_id_probe_via_raid(id, off, size) == 0)
goto found;
if (volume_id_probe_silicon_medley_raid(id, off, size) == 0)
goto found;
if (volume_id_probe_nvidia_raid(id, off, size) == 0)
goto found;
if (volume_id_probe_promise_fasttrack_raid(id, off, size) == 0)
goto found;
if (volume_id_probe_highpoint_45x_raid(id, off, size) == 0)
goto found;
}
if (volume_id_probe_lvm1(id, off) == 0)
goto found;
if (volume_id_probe_lvm2(id, off) == 0)
goto found;
if (volume_id_probe_highpoint_37x_raid(id, off) == 0)
goto found;
return -1;
found:
/* If recognized, we free the allocated buffers */
volume_id_free_buffer(id);
return 0;
}
int volume_id_probe_filesystem(struct volume_id *id, uint64_t off, uint64_t size)
{
if (id == NULL)
return -EINVAL;
if (volume_id_probe_luks(id, off) == 0)
goto found;
/* signature in the first block, only small buffer needed */
if (volume_id_probe_vfat(id, off) == 0)
goto found;
if (volume_id_probe_xfs(id, off) == 0)
goto found;
/* fill buffer with maximum */
volume_id_get_buffer(id, 0, SB_BUFFER_SIZE);
if (volume_id_probe_linux_swap(id, off) == 0)
goto found;
if (volume_id_probe_ext(id, off) == 0)
goto found;
if (volume_id_probe_reiserfs(id, off) == 0)
goto found;
if (volume_id_probe_jfs(id, off) == 0)
goto found;
if (volume_id_probe_udf(id, off) == 0)
goto found;
if (volume_id_probe_iso9660(id, off) == 0)
goto found;
if (volume_id_probe_hfs_hfsplus(id, off) == 0)
goto found;
if (volume_id_probe_ufs(id, off) == 0)
goto found;
if (volume_id_probe_ntfs(id, off) == 0)
goto found;
if (volume_id_probe_cramfs(id, off) == 0)
goto found;
if (volume_id_probe_romfs(id, off) == 0)
goto found;
if (volume_id_probe_hpfs(id, off) == 0)
goto found;
if (volume_id_probe_sysv(id, off) == 0)
goto found;
if (volume_id_probe_minix(id, off) == 0)
goto found;
if (volume_id_probe_ocfs1(id, off) == 0)
goto found;
if (volume_id_probe_ocfs2(id, off) == 0)
goto found;
if (volume_id_probe_vxfs(id, off) == 0)
goto found;
if (volume_id_probe_squashfs(id, off) == 0)
goto found;
return -1;
found:
/* If recognized, we free the allocated buffers */
volume_id_free_buffer(id);
return 0;
}
int volume_id_probe_all(struct volume_id *id, uint64_t off, uint64_t size)
{
if (id == NULL)
return -EINVAL;
if (volume_id_probe_raid(id, off, size) == 0)
return 0;
if (volume_id_probe_filesystem(id, off, size) == 0)
return 0;
return -1;
}
/* open volume by already open file descriptor */
struct volume_id *volume_id_open_fd(int fd)
{
struct volume_id *id;
id = malloc(sizeof(struct volume_id));
if (id == NULL)
return NULL;
memset(id, 0x00, sizeof(struct volume_id));
id->fd = fd;
return id;
}
/* open volume by device node */
struct volume_id *volume_id_open_node(const char *path)
{
struct volume_id *id;
int fd;
fd = open(path, O_RDONLY);
if (fd < 0) {
dbg("unable to open '%s'", path);
return NULL;
}
id = volume_id_open_fd(fd);
if (id == NULL)
return NULL;
/* close fd on device close */
id->fd_close = 1;
return id;
}
void volume_id_close(struct volume_id *id)
{
if (id == NULL)
return;
if (id->fd_close != 0)
close(id->fd);
volume_id_free_buffer(id);
free(id);
}