| /* |
| * 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 Library |
| * General Public License, version 2. |
| * %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_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 HAVE_SYS_STAT_H |
| #include <sys/stat.h> |
| #endif |
| #include <ctype.h> |
| |
| #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_size2(const char *file, int blocksize, |
| blk64_t *retblocks) |
| { |
| int fd, rc = 0; |
| unsigned long long size64; |
| ext2_loff_t high, low; |
| |
| fd = ext2fs_open_file(file, O_RDONLY, 0); |
| if (fd < 0) |
| return errno; |
| |
| #ifdef DKIOCGETBLOCKCOUNT /* For Apple Darwin */ |
| if (ioctl(fd, DKIOCGETBLOCKCOUNT, &size64) >= 0) { |
| *retblocks = size64 / (blocksize / 512); |
| goto out; |
| } |
| #endif |
| |
| #ifdef BLKGETSIZE64 |
| { |
| int valid_blkgetsize64 = 1; |
| #ifdef __linux__ |
| struct utsname ut; |
| |
| 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) { |
| *retblocks = size64 / blocksize; |
| goto out; |
| } |
| } |
| #endif /* BLKGETSIZE64 */ |
| |
| #ifdef BLKGETSIZE |
| { |
| unsigned long size; |
| |
| if (ioctl(fd, BLKGETSIZE, &size) >= 0) { |
| *retblocks = size / (blocksize / 512); |
| goto out; |
| } |
| } |
| #endif |
| |
| #ifdef FDGETPRM |
| { |
| struct floppy_struct this_floppy; |
| |
| if (ioctl(fd, FDGETPRM, &this_floppy) >= 0) { |
| *retblocks = this_floppy.size / (blocksize / 512); |
| goto out; |
| } |
| } |
| #endif |
| |
| #ifdef HAVE_SYS_DISKLABEL_H |
| { |
| int part; |
| struct disklabel lab; |
| struct partition *pp; |
| char ch; |
| |
| #if defined(DIOCGMEDIASIZE) |
| { |
| off_t ms; |
| u_int bs; |
| if (ioctl(fd, DIOCGMEDIASIZE, &ms) >= 0) { |
| *retblocks = ms / blocksize; |
| goto out; |
| } |
| } |
| #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) { |
| *retblocks = pp->p_size / (blocksize / 512); |
| goto out; |
| } |
| } |
| #endif /* defined(DIOCG*) */ |
| } |
| #endif /* HAVE_SYS_DISKLABEL_H */ |
| |
| { |
| ext2fs_struct_stat st; |
| |
| if (ext2fs_fstat(fd, &st) == 0) |
| if (S_ISREG(st.st_mode)) { |
| *retblocks = st.st_size / blocksize; |
| goto out; |
| } |
| } |
| |
| /* |
| * 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); |
| size64 = low + 1; |
| *retblocks = size64 / blocksize; |
| out: |
| close(fd); |
| return rc; |
| } |
| |
| errcode_t ext2fs_get_device_size(const char *file, int blocksize, |
| blk_t *retblocks) |
| { |
| errcode_t retval; |
| blk64_t blocks; |
| |
| retval = ext2fs_get_device_size2(file, blocksize, &blocks); |
| if (retval) |
| return retval; |
| if (blocks >= (1ULL << 32)) |
| return EFBIG; |
| *retblocks = (blk_t) blocks; |
| 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 %u 1k blocks.\n", argv[1], blocks); |
| exit(0); |
| } |
| #endif |