getsectsize.c revision c859cb1de0d624caa0779fb17d1a53766143136e 
1/*
2 * getsectsize.c --- get the sector size of a device.
3 *
4 * Copyright (C) 1995, 1995 Theodore Ts'o.
5 * Copyright (C) 2003 VMware, Inc.
6 *
7 * %Begin-Header%
8 * This file may be redistributed under the terms of the GNU Library
9 * General Public License, version 2.
10 * %End-Header%
11 */
12
13#define _LARGEFILE_SOURCE
14#define _LARGEFILE64_SOURCE
15
16#include <stdio.h>
17#if HAVE_UNISTD_H
18#include <unistd.h>
19#endif
20#if HAVE_ERRNO_H
21#include <errno.h>
22#endif
23#include <fcntl.h>
24#ifdef HAVE_LINUX_FD_H
25#include <sys/ioctl.h>
26#include <linux/fd.h>
27#endif
28
29#if defined(__linux__) && defined(_IO)
30#if !defined(BLKSSZGET)
31#define BLKSSZGET  _IO(0x12,104)/* get block device sector size */
32#endif
33#if !defined(BLKPBSZGET)
34#define BLKPBSZGET _IO(0x12,123)/* get block physical sector size */
35#endif
36#endif
37
38#include "ext2_fs.h"
39#include "ext2fs.h"
40
41/*
42 * Returns the logical sector size of a device
43 */
44errcode_t ext2fs_get_device_sectsize(const char *file, int *sectsize)
45{
46	int	fd;
47
48	fd = ext2fs_open_file(file, O_RDONLY);
49	if (fd < 0)
50		return errno;
51
52#ifdef BLKSSZGET
53	if (ioctl(fd, BLKSSZGET, sectsize) >= 0) {
54		close(fd);
55		return 0;
56	}
57#endif
58	*sectsize = 0;
59	close(fd);
60	return 0;
61}
62
63/*
64 * Returns the physical sector size of a device
65 */
66errcode_t ext2fs_get_device_phys_sectsize(const char *file, int *sectsize)
67{
68	int	fd;
69
70	fd = ext2fs_open_file(file, O_RDONLY);
71	if (fd < 0)
72		return errno;
73
74#ifdef BLKPBSZGET
75	if (ioctl(fd, BLKPBSZGET, sectsize) >= 0) {
76		close(fd);
77		return 0;
78	}
79#endif
80	*sectsize = 0;
81	close(fd);
82	return 0;
83}
84