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 Public 9 * License. 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) && !defined(BLKSSZGET) 30 #define BLKSSZGET _IO(0x12,104)/* get block device sector size */ 31 #endif 32 33 #include "ext2_fs.h" 34 #include "ext2fs.h" 35 36 /* 37 * Returns the number of blocks in a partition 38 */ 39 errcode_t ext2fs_get_device_sectsize(const char *file, int *sectsize) 40 { 41 int fd; 42 43 #ifdef HAVE_OPEN64 44 fd = open64(file, O_RDONLY); 45 #else 46 fd = open(file, O_RDONLY); 47 #endif 48 if (fd < 0) 49 return errno; 50 51 #ifdef BLKSSZGET 52 if (ioctl(fd, BLKSSZGET, sectsize) >= 0) { 53 close(fd); 54 return 0; 55 } 56 #endif 57 *sectsize = 0; 58 close(fd); 59 return 0; 60 } 61
