1 /* 2 * getsize.c --- get the size of a partition. 3 * 4 * Copyright (C) 1995, 1995 Theodore Ts'o. 5 * Copyright (C) 2003 VMware, Inc. 6 * 7 * Windows version of ext2fs_get_device_size by Chris Li, VMware. 8 * 9 * %Begin-Header% 10 * This file may be redistributed under the terms of the GNU Library 11 * General Public License, version 2. 12 * %End-Header% 13 */ 14 15 #ifndef _LARGEFILE_SOURCE 16 #define _LARGEFILE_SOURCE 17 #endif 18 #ifndef _LARGEFILE64_SOURCE 19 #define _LARGEFILE64_SOURCE 20 #endif 21 22 #include "config.h" 23 #include <stdio.h> 24 #if HAVE_UNISTD_H 25 #include <unistd.h> 26 #endif 27 #if HAVE_ERRNO_H 28 #include <errno.h> 29 #endif 30 #include <fcntl.h> 31 #ifdef HAVE_SYS_IOCTL_H 32 #include <sys/ioctl.h> 33 #endif 34 #ifdef HAVE_LINUX_FD_H 35 #include <linux/fd.h> 36 #endif 37 #ifdef HAVE_SYS_DISKLABEL_H 38 #include <sys/disklabel.h> 39 #endif 40 #ifdef HAVE_SYS_DISK_H 41 #include <sys/disk.h> 42 #endif 43 #ifdef __linux__ 44 #include <sys/utsname.h> 45 #endif 46 #if HAVE_SYS_STAT_H 47 #include <sys/stat.h> 48 #endif 49 #include <ctype.h> 50 51 #if defined(__linux__) && defined(_IO) && !defined(BLKGETSIZE) 52 #define BLKGETSIZE _IO(0x12,96) /* return device size */ 53 #endif 54 55 #if defined(__linux__) && defined(_IOR) && !defined(BLKGETSIZE64) 56 #define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size in bytes (u64 *arg) */ 57 #endif 58 59 #ifdef APPLE_DARWIN 60 #define BLKGETSIZE DKIOCGETBLOCKCOUNT32 61 #endif /* APPLE_DARWIN */ 62 63 #include "ext2_fs.h" 64 #include "ext2fs.h" 65 66 #if defined(__CYGWIN__) || defined (WIN32) 67 #include "windows.h" 68 #include "winioctl.h" 69 70 #if (_WIN32_WINNT >= 0x0500) 71 #define HAVE_GET_FILE_SIZE_EX 1 72 #endif 73 74 errcode_t ext2fs_get_device_size(const char *file, int blocksize, 75 blk_t *retblocks) 76 { 77 HANDLE dev; 78 PARTITION_INFORMATION pi; 79 DISK_GEOMETRY gi; 80 DWORD retbytes; 81 #ifdef HAVE_GET_FILE_SIZE_EX 82 LARGE_INTEGER filesize; 83 #else 84 DWORD filesize; 85 #endif /* HAVE_GET_FILE_SIZE_EX */ 86 87 dev = CreateFile(file, GENERIC_READ, 88 FILE_SHARE_READ | FILE_SHARE_WRITE , 89 NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL); 90 91 if (dev == INVALID_HANDLE_VALUE) 92 return EBADF; 93 if (DeviceIoControl(dev, IOCTL_DISK_GET_PARTITION_INFO, 94 &pi, sizeof(PARTITION_INFORMATION), 95 &pi, sizeof(PARTITION_INFORMATION), 96 &retbytes, NULL)) { 97 98 *retblocks = pi.PartitionLength.QuadPart / blocksize; 99 100 } else if (DeviceIoControl(dev, IOCTL_DISK_GET_DRIVE_GEOMETRY, 101 &gi, sizeof(DISK_GEOMETRY), 102 &gi, sizeof(DISK_GEOMETRY), 103 &retbytes, NULL)) { 104 105 *retblocks = gi.BytesPerSector * 106 gi.SectorsPerTrack * 107 gi.TracksPerCylinder * 108 gi.Cylinders.QuadPart / blocksize; 109 110 #ifdef HAVE_GET_FILE_SIZE_EX 111 } else if (GetFileSizeEx(dev, &filesize)) { 112 *retblocks = filesize.QuadPart / blocksize; 113 } 114 #else 115 } else { 116 filesize = GetFileSize(dev, NULL); 117 if (INVALID_FILE_SIZE != filesize) { 118 *retblocks = filesize / blocksize; 119 } 120 } 121 #endif /* HAVE_GET_FILE_SIZE_EX */ 122 123 CloseHandle(dev); 124 return 0; 125 } 126 127 #else 128 129 static int valid_offset (int fd, ext2_loff_t offset) 130 { 131 char ch; 132 133 if (ext2fs_llseek (fd, offset, 0) < 0) 134 return 0; 135 if (read (fd, &ch, 1) < 1) 136 return 0; 137 return 1; 138 } 139 140 /* 141 * Returns the number of blocks in a partition 142 */ 143 errcode_t ext2fs_get_device_size2(const char *file, int blocksize, 144 blk64_t *retblocks) 145 { 146 int fd, rc = 0; 147 unsigned long long size64; 148 ext2_loff_t high, low; 149 150 fd = ext2fs_open_file(file, O_RDONLY, 0); 151 if (fd < 0) 152 return errno; 153 154 #ifdef DKIOCGETBLOCKCOUNT /* For Apple Darwin */ 155 if (ioctl(fd, DKIOCGETBLOCKCOUNT, &size64) >= 0) { 156 *retblocks = size64 / (blocksize / 512); 157 goto out; 158 } 159 #endif 160 161 #ifdef BLKGETSIZE64 162 { 163 int valid_blkgetsize64 = 1; 164 #ifdef __linux__ 165 struct utsname ut; 166 167 if ((uname(&ut) == 0) && 168 ((ut.release[0] == '2') && (ut.release[1] == '.') && 169 (ut.release[2] < '6') && (ut.release[3] == '.'))) 170 valid_blkgetsize64 = 0; 171 #endif 172 if (valid_blkgetsize64 && 173 ioctl(fd, BLKGETSIZE64, &size64) >= 0) { 174 *retblocks = size64 / blocksize; 175 goto out; 176 } 177 } 178 #endif /* BLKGETSIZE64 */ 179 180 #ifdef BLKGETSIZE 181 { 182 unsigned long size; 183 184 if (ioctl(fd, BLKGETSIZE, &size) >= 0) { 185 *retblocks = size / (blocksize / 512); 186 goto out; 187 } 188 } 189 #endif 190 191 #ifdef FDGETPRM 192 { 193 struct floppy_struct this_floppy; 194 195 if (ioctl(fd, FDGETPRM, &this_floppy) >= 0) { 196 *retblocks = this_floppy.size / (blocksize / 512); 197 goto out; 198 } 199 } 200 #endif 201 202 #ifdef HAVE_SYS_DISKLABEL_H 203 { 204 int part; 205 struct disklabel lab; 206 struct partition *pp; 207 char ch; 208 209 #if defined(DIOCGMEDIASIZE) 210 { 211 off_t ms; 212 u_int bs; 213 if (ioctl(fd, DIOCGMEDIASIZE, &ms) >= 0) { 214 *retblocks = ms / blocksize; 215 goto out; 216 } 217 } 218 #elif defined(DIOCGDINFO) 219 /* old disklabel interface */ 220 part = strlen(file) - 1; 221 if (part >= 0) { 222 ch = file[part]; 223 if (isdigit(ch)) 224 part = 0; 225 else if (ch >= 'a' && ch <= 'h') 226 part = ch - 'a'; 227 else 228 part = -1; 229 } 230 if (part >= 0 && (ioctl(fd, DIOCGDINFO, (char *)&lab) >= 0)) { 231 pp = &lab.d_partitions[part]; 232 if (pp->p_size) { 233 *retblocks = pp->p_size / (blocksize / 512); 234 goto out; 235 } 236 } 237 #endif /* defined(DIOCG*) */ 238 } 239 #endif /* HAVE_SYS_DISKLABEL_H */ 240 241 { 242 ext2fs_struct_stat st; 243 244 if (ext2fs_fstat(fd, &st) == 0) 245 if (S_ISREG(st.st_mode)) { 246 *retblocks = st.st_size / blocksize; 247 goto out; 248 } 249 } 250 251 /* 252 * OK, we couldn't figure it out by using a specialized ioctl, 253 * which is generally the best way. So do binary search to 254 * find the size of the partition. 255 */ 256 low = 0; 257 for (high = 1024; valid_offset(fd, high); high *= 2) 258 low = high; 259 while (low < high - 1) { 260 const ext2_loff_t mid = (low + high) / 2; 261 262 if (valid_offset (fd, mid)) 263 low = mid; 264 else 265 high = mid; 266 } 267 valid_offset(fd, 0); 268 size64 = low + 1; 269 *retblocks = size64 / blocksize; 270 out: 271 close(fd); 272 return rc; 273 } 274 275 errcode_t ext2fs_get_device_size(const char *file, int blocksize, 276 blk_t *retblocks) 277 { 278 errcode_t retval; 279 blk64_t blocks; 280 281 retval = ext2fs_get_device_size2(file, blocksize, &blocks); 282 if (retval) 283 return retval; 284 if (blocks >= (1ULL << 32)) 285 return EFBIG; 286 *retblocks = (blk_t) blocks; 287 return 0; 288 } 289 290 #endif /* WIN32 */ 291 292 #ifdef DEBUG 293 int main(int argc, char **argv) 294 { 295 blk_t blocks; 296 int retval; 297 298 if (argc < 2) { 299 fprintf(stderr, "Usage: %s device\n", argv[0]); 300 exit(1); 301 } 302 303 retval = ext2fs_get_device_size(argv[1], 1024, &blocks); 304 if (retval) { 305 com_err(argv[0], retval, 306 "while calling ext2fs_get_device_size"); 307 exit(1); 308 } 309 printf("Device %s has %u 1k blocks.\n", argv[1], blocks); 310 exit(0); 311 } 312 #endif 313
