getsectsize.c revision d1154eb460efe588eaed3d439c1caaca149fa362
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 "config.h" 17#include <stdio.h> 18#if HAVE_UNISTD_H 19#include <unistd.h> 20#endif 21#if HAVE_ERRNO_H 22#include <errno.h> 23#endif 24#include <fcntl.h> 25#ifdef HAVE_LINUX_FD_H 26#include <sys/ioctl.h> 27#include <linux/fd.h> 28#endif 29 30#if defined(__linux__) && defined(_IO) 31#if !defined(BLKSSZGET) 32#define BLKSSZGET _IO(0x12,104)/* get block device sector size */ 33#endif 34#if !defined(BLKPBSZGET) 35#define BLKPBSZGET _IO(0x12,123)/* get block physical sector size */ 36#endif 37#endif 38 39#include "ext2_fs.h" 40#include "ext2fs.h" 41 42/* 43 * Returns the logical sector size of a device 44 */ 45errcode_t ext2fs_get_device_sectsize(const char *file, int *sectsize) 46{ 47 int fd; 48 49 fd = ext2fs_open_file(file, O_RDONLY); 50 if (fd < 0) 51 return errno; 52 53#ifdef BLKSSZGET 54 if (ioctl(fd, BLKSSZGET, sectsize) >= 0) { 55 close(fd); 56 return 0; 57 } 58#endif 59 *sectsize = 0; 60 close(fd); 61 return 0; 62} 63 64/* 65 * Returns the physical sector size of a device 66 */ 67errcode_t ext2fs_get_device_phys_sectsize(const char *file, int *sectsize) 68{ 69 int fd; 70 71 fd = ext2fs_open_file(file, O_RDONLY); 72 if (fd < 0) 73 return errno; 74 75#ifdef BLKPBSZGET 76 if (ioctl(fd, BLKPBSZGET, sectsize) >= 0) { 77 close(fd); 78 return 0; 79 } 80#endif 81 *sectsize = 0; 82 close(fd); 83 return 0; 84} 85