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