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 #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 unsigned long long size64; 146 ext2_loff_t high, low; 147 148 fd = ext2fs_open_file(file, O_RDONLY, 0); 149 if (fd < 0) 150 return errno; 151 152 #ifdef DKIOCGETBLOCKCOUNT /* For Apple Darwin */ 153 if (ioctl(fd, DKIOCGETBLOCKCOUNT, &size64) >= 0) { 154 *retblocks = size64 / (blocksize / 512); 155 goto out; 156 } 157 #endif 158 159 #ifdef BLKGETSIZE64 160 { 161 int valid_blkgetsize64 = 1; 162 #ifdef __linux__ 163 struct utsname ut; 164 165 if ((uname(&ut) == 0) && 166 ((ut.release[0] == '2') && (ut.release[1] == '.') && 167 (ut.release[2] < '6') && (ut.release[3] == '.'))) 168 valid_blkgetsize64 = 0; 169 #endif 170 if (valid_blkgetsize64 && 171 ioctl(fd, BLKGETSIZE64, &size64) >= 0) { 172 *retblocks = size64 / blocksize; 173 goto out; 174 } 175 } 176 #endif /* BLKGETSIZE64 */ 177 178 #ifdef BLKGETSIZE 179 { 180 unsigned long size; 181 182 if (ioctl(fd, BLKGETSIZE, &size) >= 0) { 183 *retblocks = size / (blocksize / 512); 184 goto out; 185 } 186 } 187 #endif 188 189 #ifdef FDGETPRM 190 { 191 struct floppy_struct this_floppy; 192 193 if (ioctl(fd, FDGETPRM, &this_floppy) >= 0) { 194 *retblocks = this_floppy.size / (blocksize / 512); 195 goto out; 196 } 197 } 198 #endif 199 200 #ifdef HAVE_SYS_DISKLABEL_H 201 { 202 int part; 203 struct disklabel lab; 204 struct partition *pp; 205 char ch; 206 207 #if defined(DIOCGMEDIASIZE) 208 { 209 off_t ms; 210 u_int bs; 211 if (ioctl(fd, DIOCGMEDIASIZE, &ms) >= 0) { 212 *retblocks = ms / blocksize; 213 goto out; 214 } 215 } 216 #elif defined(DIOCGDINFO) 217 /* old disklabel interface */ 218 part = strlen(file) - 1; 219 if (part >= 0) { 220 ch = file[part]; 221 if (isdigit(ch)) 222 part = 0; 223 else if (ch >= 'a' && ch <= 'h') 224 part = ch - 'a'; 225 else 226 part = -1; 227 } 228 if (part >= 0 && (ioctl(fd, DIOCGDINFO, (char *)&lab) >= 0)) { 229 pp = &lab.d_partitions[part]; 230 if (pp->p_size) { 231 *retblocks = pp->p_size / (blocksize / 512); 232 goto out; 233 } 234 } 235 #endif /* defined(DIOCG*) */ 236 } 237 #endif /* HAVE_SYS_DISKLABEL_H */ 238 239 { 240 ext2fs_struct_stat st; 241 242 if (ext2fs_fstat(fd, &st) == 0) 243 if (S_ISREG(st.st_mode)) { 244 *retblocks = st.st_size / blocksize; 245 goto out; 246 } 247 } 248 249 /* 250 * OK, we couldn't figure it out by using a specialized ioctl, 251 * which is generally the best way. So do binary search to 252 * find the size of the partition. 253 */ 254 low = 0; 255 for (high = 1024; valid_offset(fd, high); high *= 2) 256 low = high; 257 while (low < high - 1) { 258 const ext2_loff_t mid = (low + high) / 2; 259 260 if (valid_offset (fd, mid)) 261 low = mid; 262 else 263 high = mid; 264 } 265 valid_offset(fd, 0); 266 size64 = low + 1; 267 *retblocks = size64 / blocksize; 268 out: 269 close(fd); 270 return rc; 271 } 272 273 errcode_t ext2fs_get_device_size(const char *file, int blocksize, 274 blk_t *retblocks) 275 { 276 errcode_t retval; 277 blk64_t blocks; 278 279 retval = ext2fs_get_device_size2(file, blocksize, &blocks); 280 if (retval) 281 return retval; 282 if (blocks >= (1ULL << 32)) 283 return EFBIG; 284 *retblocks = (blk_t) blocks; 285 return 0; 286 } 287 288 #endif /* WIN32 */ 289 290 #ifdef DEBUG 291 int main(int argc, char **argv) 292 { 293 blk_t blocks; 294 int retval; 295 296 if (argc < 2) { 297 fprintf(stderr, "Usage: %s device\n", argv[0]); 298 exit(1); 299 } 300 301 retval = ext2fs_get_device_size(argv[1], 1024, &blocks); 302 if (retval) { 303 com_err(argv[0], retval, 304 "while calling ext2fs_get_device_size"); 305 exit(1); 306 } 307 printf("Device %s has %u 1k blocks.\n", argv[1], blocks); 308 exit(0); 309 } 310 #endif 311
