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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