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/* 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
#endif
errcode_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;
}
#else
static 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 DEBUG
int 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
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