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 Public 11 * License. 12 * %End-Header% 13 */ 14 15 #define _LARGEFILE_SOURCE 16 #define _LARGEFILE64_SOURCE 17 18 #include <stdio.h> 19 #if HAVE_UNISTD_H 20 #include <unistd.h> 21 #endif 22 #if HAVE_ERRNO_H 23 #include <errno.h> 24 #endif 25 #include <fcntl.h> 26 #ifdef HAVE_SYS_IOCTL_H 27 #include <sys/ioctl.h> 28 #endif 29 #ifdef HAVE_LINUX_FD_H 30 #include <linux/fd.h> 31 #endif 32 #ifdef HAVE_SYS_DISKLABEL_H 33 #include <sys/disklabel.h> 34 #endif 35 #ifdef HAVE_SYS_DISK_H 36 #ifdef HAVE_SYS_QUEUE_H 37 #include <sys/queue.h> /* for LIST_HEAD */ 38 #endif 39 #include <sys/disk.h> 40 #endif 41 #ifdef __linux__ 42 #include <sys/utsname.h> 43 #endif 44 #if HAVE_SYS_STAT_H 45 #include <sys/stat.h> 46 #endif 47 #include <ctype.h> 48 49 #if defined(__linux__) && defined(_IO) && !defined(BLKGETSIZE) 50 #define BLKGETSIZE _IO(0x12,96) /* return device size */ 51 #endif 52 53 #if defined(__linux__) && defined(_IOR) && !defined(BLKGETSIZE64) 54 #define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size in bytes (u64 *arg) */ 55 #endif 56 57 #ifdef APPLE_DARWIN 58 #define BLKGETSIZE DKIOCGETBLOCKCOUNT32 59 #endif /* APPLE_DARWIN */ 60 61 #include "ext2_fs.h" 62 #include "ext2fs.h" 63 64 #if defined(__CYGWIN__) || defined (WIN32) 65 #include "windows.h" 66 #include "winioctl.h" 67 68 #if (_WIN32_WINNT >= 0x0500) 69 #define HAVE_GET_FILE_SIZE_EX 1 70 #endif 71 72 errcode_t ext2fs_get_device_size(const char *file, int blocksize, 73 blk_t *retblocks) 74 { 75 HANDLE dev; 76 PARTITION_INFORMATION pi; 77 DISK_GEOMETRY gi; 78 DWORD retbytes; 79 #ifdef HAVE_GET_FILE_SIZE_EX 80 LARGE_INTEGER filesize; 81 #else 82 DWORD filesize; 83 #endif /* HAVE_GET_FILE_SIZE_EX */ 84 85 dev = CreateFile(file, GENERIC_READ, 86 FILE_SHARE_READ | FILE_SHARE_WRITE , 87 NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL); 88 89 if (dev == INVALID_HANDLE_VALUE) 90 return EBADF; 91 if (DeviceIoControl(dev, IOCTL_DISK_GET_PARTITION_INFO, 92 &pi, sizeof(PARTITION_INFORMATION), 93 &pi, sizeof(PARTITION_INFORMATION), 94 &retbytes, NULL)) { 95 96 *retblocks = pi.PartitionLength.QuadPart / blocksize; 97 98 } else if (DeviceIoControl(dev, IOCTL_DISK_GET_DRIVE_GEOMETRY, 99 &gi, sizeof(DISK_GEOMETRY), 100 &gi, sizeof(DISK_GEOMETRY), 101 &retbytes, NULL)) { 102 103 *retblocks = gi.BytesPerSector * 104 gi.SectorsPerTrack * 105 gi.TracksPerCylinder * 106 gi.Cylinders.QuadPart / blocksize; 107 108 #ifdef HAVE_GET_FILE_SIZE_EX 109 } else if (GetFileSizeEx(dev, &filesize)) { 110 *retblocks = filesize.QuadPart / blocksize; 111 } 112 #else 113 } else { 114 filesize = GetFileSize(dev, NULL); 115 if (INVALID_FILE_SIZE != filesize) { 116 *retblocks = filesize / blocksize; 117 } 118 } 119 #endif /* HAVE_GET_FILE_SIZE_EX */ 120 121 CloseHandle(dev); 122 return 0; 123 } 124 125 #else 126 127 static int valid_offset (int fd, ext2_loff_t offset) 128 { 129 char ch; 130 131 if (ext2fs_llseek (fd, offset, 0) < 0) 132 return 0; 133 if (read (fd, &ch, 1) < 1) 134 return 0; 135 return 1; 136 } 137 138 /* 139 * Returns the number of blocks in a partition 140 */ 141 errcode_t ext2fs_get_device_size2(const char *file, int blocksize, 142 blk64_t *retblocks) 143 { 144 int fd, rc = 0; 145 int valid_blkgetsize64 = 1; 146 #ifdef __linux__ 147 struct utsname ut; 148 #endif 149 unsigned long long size64; 150 unsigned long size; 151 ext2_loff_t high, low; 152 #ifdef FDGETPRM 153 struct floppy_struct this_floppy; 154 #endif 155 #ifdef HAVE_SYS_DISKLABEL_H 156 int part; 157 struct disklabel lab; 158 struct partition *pp; 159 char ch; 160 #endif /* HAVE_SYS_DISKLABEL_H */ 161 162 #ifdef HAVE_OPEN64 163 fd = open64(file, O_RDONLY); 164 #else 165 fd = open(file, O_RDONLY); 166 #endif 167 if (fd < 0) 168 return errno; 169 170 #ifdef DKIOCGETBLOCKCOUNT /* For Apple Darwin */ 171 if (ioctl(fd, DKIOCGETBLOCKCOUNT, &size64) >= 0) { 172 *retblocks = size64 / (blocksize / 512); 173 goto out; 174 } 175 #endif 176 177 #ifdef BLKGETSIZE64 178 #ifdef __linux__ 179 if ((uname(&ut) == 0) && 180 ((ut.release[0] == '2') && (ut.release[1] == '.') && 181 (ut.release[2] < '6') && (ut.release[3] == '.'))) 182 valid_blkgetsize64 = 0; 183 #endif 184 if (valid_blkgetsize64 && 185 ioctl(fd, BLKGETSIZE64, &size64) >= 0) { 186 *retblocks = size64 / blocksize; 187 goto out; 188 } 189 #endif 190 191 #ifdef BLKGETSIZE 192 if (ioctl(fd, BLKGETSIZE, &size) >= 0) { 193 *retblocks = size / (blocksize / 512); 194 goto out; 195 } 196 #endif 197 198 #ifdef FDGETPRM 199 if (ioctl(fd, FDGETPRM, &this_floppy) >= 0) { 200 *retblocks = this_floppy.size / (blocksize / 512); 201 goto out; 202 } 203 #endif 204 205 #ifdef HAVE_SYS_DISKLABEL_H 206 #if defined(DIOCGMEDIASIZE) 207 { 208 off_t ms; 209 u_int bs; 210 if (ioctl(fd, DIOCGMEDIASIZE, &ms) >= 0) { 211 *retblocks = ms / blocksize; 212 goto out; 213 } 214 } 215 #elif defined(DIOCGDINFO) 216 /* old disklabel interface */ 217 part = strlen(file) - 1; 218 if (part >= 0) { 219 ch = file[part]; 220 if (isdigit(ch)) 221 part = 0; 222 else if (ch >= 'a' && ch <= 'h') 223 part = ch - 'a'; 224 else 225 part = -1; 226 } 227 if (part >= 0 && (ioctl(fd, DIOCGDINFO, (char *)&lab) >= 0)) { 228 pp = &lab.d_partitions[part]; 229 if (pp->p_size) { 230 *retblocks = pp->p_size / (blocksize / 512); 231 goto out; 232 } 233 } 234 #endif /* defined(DIOCG*) */ 235 #endif /* HAVE_SYS_DISKLABEL_H */ 236 237 { 238 #ifdef HAVE_FSTAT64 239 struct stat64 st; 240 if (fstat64(fd, &st) == 0) 241 #else 242 struct stat st; 243 if (fstat(fd, &st) == 0) 244 #endif 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 { 261 const ext2_loff_t mid = (low + high) / 2; 262 263 if (valid_offset (fd, mid)) 264 low = mid; 265 else 266 high = mid; 267 } 268 valid_offset (fd, 0); 269 size64 = low + 1; 270 *retblocks = size64 / blocksize; 271 out: 272 close(fd); 273 return rc; 274 } 275 276 errcode_t ext2fs_get_device_size(const char *file, int blocksize, 277 blk_t *retblocks) 278 { 279 errcode_t retval; 280 blk64_t blocks; 281 282 retval = ext2fs_get_device_size2(file, blocksize, &blocks); 283 if (retval) 284 return retval; 285 if (blocks >= (1ULL << 32)) 286 return EFBIG; 287 *retblocks = (blk_t) blocks; 288 return 0; 289 } 290 291 #endif /* WIN32 */ 292 293 #ifdef DEBUG 294 int main(int argc, char **argv) 295 { 296 blk_t blocks; 297 int retval; 298 299 if (argc < 2) { 300 fprintf(stderr, "Usage: %s device\n", argv[0]); 301 exit(1); 302 } 303 304 retval = ext2fs_get_device_size(argv[1], 1024, &blocks); 305 if (retval) { 306 com_err(argv[0], retval, 307 "while calling ext2fs_get_device_size"); 308 exit(1); 309 } 310 printf("Device %s has %u 1k blocks.\n", argv[1], blocks); 311 exit(0); 312 } 313 #endif 314
