[3320] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * getsize.c --- get the size of a partition.
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| 4 | *
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| 5 | * Copyright (C) 1995, 1995 Theodore Ts'o.
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| 6 | * Copyright (C) 2003 VMware, Inc.
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| 7 | *
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| 8 | * Windows version of ext2fs_get_device_size by Chris Li, VMware.
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| 9 | *
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| 10 | * %Begin-Header%
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| 11 | * This file may be redistributed under the terms of the GNU Public
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| 12 | * License.
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| 13 | * %End-Header%
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| 14 | */
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| 15 |
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| 16 | #include <stdio.h>
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| 17 | #if HAVE_UNISTD_H
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| 18 | #include <unistd.h>
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| 19 | #endif
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| 20 | #if HAVE_ERRNO_H
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| 21 | #include <errno.h>
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| 22 | #endif
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| 23 | #include <fcntl.h>
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| 24 | #ifdef HAVE_SYS_IOCTL_H
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| 25 | #include <sys/ioctl.h>
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| 26 | #endif
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| 27 | #ifdef HAVE_LINUX_FD_H
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| 28 | #include <linux/fd.h>
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| 29 | #endif
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| 30 | #ifdef HAVE_SYS_DISKLABEL_H
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| 31 | #include <sys/disklabel.h>
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| 32 | #endif
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| 33 | #ifdef HAVE_SYS_DISK_H
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| 34 | #ifdef HAVE_SYS_QUEUE_H
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| 35 | #include <sys/queue.h> /* for LIST_HEAD */
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| 36 | #endif
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| 37 | #include <sys/disk.h>
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| 38 | #endif
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| 39 | #ifdef __linux__
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| 40 | #include <sys/utsname.h>
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| 41 | #endif
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| 42 |
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| 43 | #if defined(__linux__) && defined(_IO) && !defined(BLKGETSIZE)
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| 44 | #define BLKGETSIZE _IO(0x12,96) /* return device size */
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| 45 | #endif
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| 46 |
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| 47 | #if defined(__linux__) && defined(_IOR) && !defined(BLKGETSIZE64)
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| 48 | #define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size in bytes (u64 *arg) */
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| 49 | #endif
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| 50 |
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| 51 | #ifdef APPLE_DARWIN
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| 52 | #define BLKGETSIZE DKIOCGETBLOCKCOUNT32
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| 53 | #endif /* APPLE_DARWIN */
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| 54 |
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| 55 | #include "ext2_fs.h"
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| 56 | #include "ext2fs.h"
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| 57 |
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| 58 | #if defined(__CYGWIN__) || defined(WIN32)
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| 59 | #include <windows.h>
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| 60 | #include <winioctl.h>
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| 61 |
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| 62 | #if (_WIN32_WINNT >= 0x0500)
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| 63 | #define HAVE_GET_FILE_SIZE_EX 1
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| 64 | #endif
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| 65 |
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| 66 | errcode_t ext2fs_get_device_size(const char *file, int blocksize,
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| 67 | blk_t *retblocks)
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| 68 | {
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| 69 | HANDLE dev;
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| 70 | PARTITION_INFORMATION pi;
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| 71 | DISK_GEOMETRY gi;
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| 72 | DWORD retbytes;
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| 73 | #ifdef HAVE_GET_FILE_SIZE_EX
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| 74 | LARGE_INTEGER filesize;
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| 75 | #else
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| 76 | DWORD filesize;
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| 77 | #endif /* HAVE_GET_FILE_SIZE_EX */
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| 78 |
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| 79 | dev = CreateFile(file, GENERIC_READ,
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| 80 | FILE_SHARE_READ | FILE_SHARE_WRITE ,
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| 81 | NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
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| 82 |
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| 83 | if (dev == INVALID_HANDLE_VALUE)
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| 84 | return EBADF;
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| 85 | if (DeviceIoControl(dev, IOCTL_DISK_GET_PARTITION_INFO,
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| 86 | &pi, sizeof(PARTITION_INFORMATION),
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| 87 | &pi, sizeof(PARTITION_INFORMATION),
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| 88 | &retbytes, NULL)) {
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| 89 |
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| 90 | *retblocks = pi.PartitionLength.QuadPart / blocksize;
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| 91 |
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| 92 | } else if (DeviceIoControl(dev, IOCTL_DISK_GET_DRIVE_GEOMETRY,
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| 93 | &gi, sizeof(DISK_GEOMETRY),
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| 94 | &gi, sizeof(DISK_GEOMETRY),
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| 95 | &retbytes, NULL)) {
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| 96 |
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| 97 | *retblocks = gi.BytesPerSector *
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| 98 | gi.SectorsPerTrack *
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| 99 | gi.TracksPerCylinder *
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| 100 | gi.Cylinders.QuadPart / blocksize;
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| 101 |
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| 102 | #ifdef HAVE_GET_FILE_SIZE_EX
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| 103 | } else if (GetFileSizeEx(dev, &filesize)) {
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| 104 | *retblocks = filesize.QuadPart / blocksize;
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| 105 | }
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| 106 | #else
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| 107 | } else {
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| 108 | filesize = GetFileSize(dev, NULL);
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| 109 | if (INVALID_FILE_SIZE != filesize) {
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| 110 | *retblocks = filesize / blocksize;
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| 111 | }
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| 112 | }
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| 113 | #endif /* HAVE_GET_FILE_SIZE_EX */
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| 114 |
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| 115 | CloseHandle(dev);
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| 116 | return 0;
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| 117 | }
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| 118 |
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| 119 | #else
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| 120 |
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| 121 | static int valid_offset (int fd, ext2_loff_t offset)
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| 122 | {
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| 123 | char ch;
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| 124 |
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| 125 | if (ext2fs_llseek (fd, offset, 0) < 0)
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| 126 | return 0;
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| 127 | if (read (fd, &ch, 1) < 1)
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| 128 | return 0;
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| 129 | return 1;
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| 130 | }
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| 131 |
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| 132 | /*
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| 133 | * Returns the number of blocks in a partition
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| 134 | */
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| 135 | errcode_t ext2fs_get_device_size(const char *file, int blocksize,
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| 136 | blk_t *retblocks)
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| 137 | {
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| 138 | int fd;
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| 139 | int valid_blkgetsize64 = 1;
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| 140 | #ifdef __linux__
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| 141 | struct utsname ut;
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| 142 | #endif
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| 143 | unsigned long long size64;
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| 144 | unsigned long size;
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| 145 | ext2_loff_t high, low;
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| 146 | #ifdef FDGETPRM
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| 147 | struct floppy_struct this_floppy;
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| 148 | #endif
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| 149 | #ifdef HAVE_SYS_DISKLABEL_H
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| 150 | int part;
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| 151 | struct disklabel lab;
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| 152 | struct partition *pp;
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| 153 | char ch;
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| 154 | #endif /* HAVE_SYS_DISKLABEL_H */
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| 155 |
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| 156 | #ifdef CONFIG_LFS
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| 157 | fd = open64(file, O_RDONLY);
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| 158 | #else
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| 159 | fd = open(file, O_RDONLY);
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| 160 | #endif
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| 161 | if (fd < 0)
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| 162 | return errno;
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| 163 |
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| 164 | #ifdef DKIOCGETBLOCKCOUNT /* For Apple Darwin */
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| 165 | if (ioctl(fd, DKIOCGETBLOCKCOUNT, &size64) >= 0) {
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| 166 | if ((sizeof(*retblocks) < sizeof(unsigned long long))
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| 167 | && ((size64 / (blocksize / 512)) > 0xFFFFFFFF))
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| 168 | return EFBIG;
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| 169 | close(fd);
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| 170 | *retblocks = size64 / (blocksize / 512);
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| 171 | return 0;
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| 172 | }
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| 173 | #endif
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| 174 |
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| 175 | #ifdef BLKGETSIZE64
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| 176 | #ifdef __linux__
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| 177 | if ((uname(&ut) == 0) &&
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| 178 | ((ut.release[0] == '2') && (ut.release[1] == '.') &&
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| 179 | (ut.release[2] < '6') && (ut.release[3] == '.')))
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| 180 | valid_blkgetsize64 = 0;
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| 181 | #endif
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| 182 | if (valid_blkgetsize64 &&
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| 183 | ioctl(fd, BLKGETSIZE64, &size64) >= 0) {
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| 184 | if ((sizeof(*retblocks) < sizeof(unsigned long long))
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| 185 | && ((size64 / blocksize) > 0xFFFFFFFF))
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| 186 | return EFBIG;
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| 187 | close(fd);
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| 188 | *retblocks = size64 / blocksize;
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| 189 | return 0;
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| 190 | }
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| 191 | #endif
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| 192 |
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| 193 | #ifdef BLKGETSIZE
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| 194 | if (ioctl(fd, BLKGETSIZE, &size) >= 0) {
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| 195 | close(fd);
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| 196 | *retblocks = size / (blocksize / 512);
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| 197 | return 0;
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| 198 | }
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| 199 | #endif
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| 200 |
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| 201 | #ifdef FDGETPRM
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| 202 | if (ioctl(fd, FDGETPRM, &this_floppy) >= 0) {
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| 203 | close(fd);
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| 204 | *retblocks = this_floppy.size / (blocksize / 512);
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| 205 | return 0;
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| 206 | }
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| 207 | #endif
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| 208 |
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| 209 | #ifdef HAVE_SYS_DISKLABEL_H
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| 210 | #if defined(DIOCGMEDIASIZE)
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| 211 | {
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| 212 | off_t ms;
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| 213 | u_int bs;
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| 214 | if (ioctl(fd, DIOCGMEDIASIZE, &ms) >= 0) {
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| 215 | *retblocks = ms / blocksize;
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| 216 | return 0;
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| 217 | }
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| 218 | }
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| 219 | #elif defined(DIOCGDINFO)
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| 220 | /* old disklabel interface */
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| 221 | part = strlen(file) - 1;
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| 222 | if (part >= 0) {
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| 223 | ch = file[part];
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| 224 | if (isdigit(ch))
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| 225 | part = 0;
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| 226 | else if (ch >= 'a' && ch <= 'h')
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| 227 | part = ch - 'a';
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| 228 | else
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| 229 | part = -1;
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| 230 | }
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| 231 | if (part >= 0 && (ioctl(fd, DIOCGDINFO, (char *)&lab) >= 0)) {
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| 232 | pp = &lab.d_partitions[part];
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| 233 | if (pp->p_size) {
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| 234 | close(fd);
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| 235 | *retblocks = pp->p_size / (blocksize / 512);
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| 236 | return 0;
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| 237 | }
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| 238 | }
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| 239 | #endif /* defined(DIOCG*) */
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| 240 | #endif /* HAVE_SYS_DISKLABEL_H */
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| 241 |
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| 242 | /*
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| 243 | * OK, we couldn't figure it out by using a specialized ioctl,
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| 244 | * which is generally the best way. So do binary search to
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| 245 | * find the size of the partition.
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| 246 | */
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| 247 | low = 0;
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| 248 | for (high = 1024; valid_offset (fd, high); high *= 2)
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| 249 | low = high;
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| 250 | while (low < high - 1)
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| 251 | {
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| 252 | const ext2_loff_t mid = (low + high) / 2;
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| 253 |
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| 254 | if (valid_offset (fd, mid))
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| 255 | low = mid;
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| 256 | else
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| 257 | high = mid;
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| 258 | }
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| 259 | valid_offset (fd, 0);
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| 260 | close(fd);
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| 261 | size64 = low + 1;
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| 262 | if ((sizeof(*retblocks) < sizeof(unsigned long long))
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| 263 | && ((size64 / blocksize) > 0xFFFFFFFF))
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| 264 | return EFBIG;
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| 265 | *retblocks = size64 / blocksize;
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| 266 | return 0;
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| 267 | }
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| 268 |
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| 269 | #endif /* WIN32 */
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| 270 |
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| 271 | #ifdef DEBUG
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| 272 | int main(int argc, char **argv)
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| 273 | {
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| 274 | blk_t blocks;
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| 275 | int retval;
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| 276 |
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| 277 | if (argc < 2) {
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| 278 | fprintf(stderr, "Usage: %s device\n", argv[0]);
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| 279 | exit(1);
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| 280 | }
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| 281 |
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| 282 | retval = ext2fs_get_device_size(argv[1], 1024, &blocks);
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| 283 | if (retval) {
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| 284 | com_err(argv[0], retval,
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| 285 | "while calling ext2fs_get_device_size");
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| 286 | exit(1);
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| 287 | }
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| 288 | printf("Device %s has %d 1k blocks.\n", argv[1], blocks);
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| 289 | exit(0);
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| 290 | }
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| 291 | #endif
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