| /* |
| * 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% |
| */ |
| |
| #define _LARGEFILE_SOURCE |
| #define _LARGEFILE64_SOURCE |
| |
| #include <stdio.h> |
| #if HAVE_UNISTD_H |
| #include <unistd.h> |
| #endif |
| #if HAVE_ERRNO_H |
| #include <errno.h> |
| #endif |
| #include <fcntl.h> |
| #ifdef HAVE_LINUX_FD_H |
| #include <sys/ioctl.h> |
| #include <linux/fd.h> |
| #endif |
| #ifdef HAVE_SYS_DISKLABEL_H |
| #include <sys/ioctl.h> |
| #include <sys/disklabel.h> |
| #endif /* HAVE_SYS_DISKLABEL_H */ |
| |
| #if defined(__linux__) && defined(_IO) && !defined(BLKGETSIZE) |
| #define BLKGETSIZE _IO(0x12,96) /* return device size */ |
| #endif |
| |
| #ifdef APPLE_DARWIN |
| #include <sys/ioctl.h> |
| #include <sys/disk.h> |
| |
| #define BLKGETSIZE DKIOCGETBLOCKCOUNT32 |
| #endif /* APPLE_DARWIN */ |
| |
| #include "ext2_fs.h" |
| #include "ext2fs.h" |
| |
| #if defined(__CYGWIN__) || defined (WIN32) |
| #include "windows.h" |
| #include "winioctl.h" |
| |
| errcode_t ext2fs_get_device_size(const char *file, int blocksize, |
| blk_t *retblocks) |
| { |
| HANDLE dev; |
| PARTITION_INFORMATION pi; |
| DISK_GEOMETRY gi; |
| DWORD retbytes; |
| |
| 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; |
| } |
| |
| 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; |
| #ifdef BLKGETSIZE |
| unsigned long size; |
| #endif |
| 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 HAVE_OPEN64 |
| fd = open64(file, O_RDONLY); |
| #else |
| fd = open(file, O_RDONLY); |
| #endif |
| if (fd < 0) |
| return errno; |
| |
| #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 |
| 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 /* 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); |
| *retblocks = (low + 1) / 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 |