/* vi: set sw=4 ts=4: *//* * getsize.c --- get the size of a partition. * * Copyright (C) 1995, 1995 Theodore Ts'o. * Copyright (C) 2003 VMware, Inc. * * Windows version of ext2fs_get_device_size by Chris Li, VMware. * * %Begin-Header% * This file may be redistributed under the terms of the GNU Public * License. * %End-Header% */#include <stdio.h>#if HAVE_UNISTD_H#include <unistd.h>#endif#if HAVE_ERRNO_H#include <errno.h>#endif#include <fcntl.h>#ifdef HAVE_SYS_IOCTL_H#include <sys/ioctl.h>#endif#ifdef HAVE_LINUX_FD_H#include <linux/fd.h>#endif#ifdef HAVE_SYS_DISKLABEL_H#include <sys/disklabel.h>#endif#ifdef HAVE_SYS_DISK_H#ifdef HAVE_SYS_QUEUE_H#include <sys/queue.h> /* for LIST_HEAD */#endif#include <sys/disk.h>#endif#ifdef __linux__#include <sys/utsname.h>#endif#if defined(__linux__) && defined(_IO) && !defined(BLKGETSIZE)#define BLKGETSIZE _IO(0x12,96)	/* return device size */#endif#if defined(__linux__) && defined(_IOR) && !defined(BLKGETSIZE64)#define BLKGETSIZE64 _IOR(0x12,114,size_t)	/* return device size in bytes (u64 *arg) */#endif#ifdef APPLE_DARWIN#define BLKGETSIZE DKIOCGETBLOCKCOUNT32#endif /* APPLE_DARWIN */#include "ext2_fs.h"#include "ext2fs.h"#if defined(__CYGWIN__) || defined(WIN32)#include <windows.h>#include <winioctl.h>#if (_WIN32_WINNT >= 0x0500)#define HAVE_GET_FILE_SIZE_EX 1#endiferrcode_t ext2fs_get_device_size(const char *file, int blocksize,				 blk_t *retblocks){	HANDLE dev;	PARTITION_INFORMATION pi;	DISK_GEOMETRY gi;	DWORD retbytes;#ifdef HAVE_GET_FILE_SIZE_EX	LARGE_INTEGER filesize;#else	DWORD filesize;#endif /* HAVE_GET_FILE_SIZE_EX */	dev = CreateFile(file, GENERIC_READ,			 FILE_SHARE_READ | FILE_SHARE_WRITE ,			 NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);	if (dev == INVALID_HANDLE_VALUE)		return EBADF;	if (DeviceIoControl(dev, IOCTL_DISK_GET_PARTITION_INFO,			    &pi, sizeof(PARTITION_INFORMATION),			    &pi, sizeof(PARTITION_INFORMATION),			    &retbytes, NULL)) {		*retblocks = pi.PartitionLength.QuadPart / blocksize;	} else if (DeviceIoControl(dev, IOCTL_DISK_GET_DRIVE_GEOMETRY,				&gi, sizeof(DISK_GEOMETRY),				&gi, sizeof(DISK_GEOMETRY),				&retbytes, NULL)) {		*retblocks = gi.BytesPerSector *			     gi.SectorsPerTrack *			     gi.TracksPerCylinder *			     gi.Cylinders.QuadPart / blocksize;#ifdef HAVE_GET_FILE_SIZE_EX	} else if (GetFileSizeEx(dev, &filesize)) {		*retblocks = filesize.QuadPart / blocksize;	}#else	} else {		filesize = GetFileSize(dev, NULL);		if (INVALID_FILE_SIZE != filesize) {			*retblocks = filesize / blocksize;		}	}#endif /* HAVE_GET_FILE_SIZE_EX */	CloseHandle(dev);	return 0;}#elsestatic int valid_offset (int fd, ext2_loff_t offset){	char ch;	if (ext2fs_llseek (fd, offset, 0) < 0)		return 0;	if (read (fd, &ch, 1) < 1)		return 0;	return 1;}/* * Returns the number of blocks in a partition */errcode_t ext2fs_get_device_size(const char *file, int blocksize,				 blk_t *retblocks){	int	fd;	int valid_blkgetsize64 = 1;#ifdef __linux__	struct		utsname ut;#endif	unsigned long long size64;	unsigned long	size;	ext2_loff_t high, low;#ifdef FDGETPRM	struct floppy_struct this_floppy;#endif#ifdef HAVE_SYS_DISKLABEL_H	int part;	struct disklabel lab;	struct partition *pp;	char ch;#endif /* HAVE_SYS_DISKLABEL_H */#ifdef CONFIG_LFS	fd = open64(file, O_RDONLY);#else	fd = open(file, O_RDONLY);#endif	if (fd < 0)		return errno;#ifdef DKIOCGETBLOCKCOUNT	/* For Apple Darwin */	if (ioctl(fd, DKIOCGETBLOCKCOUNT, &size64) >= 0) {		if ((sizeof(*retblocks) < sizeof(unsigned long long))		    && ((size64 / (blocksize / 512)) > 0xFFFFFFFF))			return EFBIG;		close(fd);		*retblocks = size64 / (blocksize / 512);		return 0;	}#endif#ifdef BLKGETSIZE64#ifdef __linux__	if ((uname(&ut) == 0) &&	    ((ut.release[0] == '2') && (ut.release[1] == '.') &&	     (ut.release[2] < '6') && (ut.release[3] == '.')))		valid_blkgetsize64 = 0;#endif	if (valid_blkgetsize64 &&	    ioctl(fd, BLKGETSIZE64, &size64) >= 0) {		if ((sizeof(*retblocks) < sizeof(unsigned long long))		    && ((size64 / blocksize) > 0xFFFFFFFF))			return EFBIG;		close(fd);		*retblocks = size64 / blocksize;		return 0;	}#endif#ifdef BLKGETSIZE	if (ioctl(fd, BLKGETSIZE, &size) >= 0) {		close(fd);		*retblocks = size / (blocksize / 512);		return 0;	}#endif#ifdef FDGETPRM	if (ioctl(fd, FDGETPRM, &this_floppy) >= 0) {		close(fd);		*retblocks = this_floppy.size / (blocksize / 512);		return 0;	}#endif#ifdef HAVE_SYS_DISKLABEL_H#if defined(DIOCGMEDIASIZE)	{	    off_t ms;	    u_int bs;	    if (ioctl(fd, DIOCGMEDIASIZE, &ms) >= 0) {		*retblocks = ms / blocksize;		return 0;	    }	}#elif defined(DIOCGDINFO)	/* old disklabel interface */	part = strlen(file) - 1;	if (part >= 0) {		ch = file[part];		if (isdigit(ch))			part = 0;		else if (ch >= 'a' && ch <= 'h')			part = ch - 'a';		else			part = -1;	}	if (part >= 0 && (ioctl(fd, DIOCGDINFO, (char *)&lab) >= 0)) {		pp = &lab.d_partitions[part];		if (pp->p_size) {			close(fd);			*retblocks = pp->p_size / (blocksize / 512);			return 0;		}	}#endif /* defined(DIOCG*) */#endif /* HAVE_SYS_DISKLABEL_H */	/*	 * OK, we couldn't figure it out by using a specialized ioctl,	 * which is generally the best way.  So do binary search to	 * find the size of the partition.	 */	low = 0;	for (high = 1024; valid_offset (fd, high); high *= 2)		low = high;	while (low < high - 1)	{		const ext2_loff_t mid = (low + high) / 2;		if (valid_offset (fd, mid))			low = mid;		else			high = mid;	}	valid_offset (fd, 0);	close(fd);	size64 = low + 1;	if ((sizeof(*retblocks) < sizeof(unsigned long long))	    && ((size64 / blocksize) > 0xFFFFFFFF))		return EFBIG;	*retblocks = size64 / blocksize;	return 0;}#endif /* WIN32 */#ifdef DEBUGint main(int argc, char **argv){	blk_t	blocks;	int	retval;	if (argc < 2) {		fprintf(stderr, "Usage: %s device\n", argv[0]);		exit(1);	}	retval = ext2fs_get_device_size(argv[1], 1024, &blocks);	if (retval) {		com_err(argv[0], retval,			"while calling ext2fs_get_device_size");		exit(1);	}	printf("Device %s has %d 1k blocks.\n", argv[1], blocks);	exit(0);}#endif