2 * getsize.c --- get the size of a partition.
4 * Copyright (C) 1995, 1995 Theodore Ts'o.
5 * Copyright (C) 2003 VMware, Inc.
7 * Windows version of ext2fs_get_device_size by Chris Li, VMware.
10 * This file may be redistributed under the terms of the GNU Library
11 * General Public License, version 2.
15 #ifndef _LARGEFILE_SOURCE
16 #define _LARGEFILE_SOURCE
18 #ifndef _LARGEFILE64_SOURCE
19 #define _LARGEFILE64_SOURCE
31 #ifdef HAVE_SYS_IOCTL_H
32 #include <sys/ioctl.h>
34 #ifdef HAVE_LINUX_FD_H
37 #ifdef HAVE_SYS_DISKLABEL_H
38 #include <sys/disklabel.h>
40 #ifdef HAVE_SYS_DISK_H
44 #include <sys/utsname.h>
51 #if defined(__linux__) && defined(_IO) && !defined(BLKGETSIZE)
52 #define BLKGETSIZE _IO(0x12,96) /* return device size */
55 #if defined(__linux__) && defined(_IOR) && !defined(BLKGETSIZE64)
56 #define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size in bytes (u64 *arg) */
60 #define BLKGETSIZE DKIOCGETBLOCKCOUNT32
61 #endif /* APPLE_DARWIN */
66 #if defined(__CYGWIN__) || defined (WIN32)
70 #if (_WIN32_WINNT >= 0x0500)
71 #define HAVE_GET_FILE_SIZE_EX 1
74 errcode_t ext2fs_get_device_size(const char *file, int blocksize,
78 PARTITION_INFORMATION pi;
81 #ifdef HAVE_GET_FILE_SIZE_EX
82 LARGE_INTEGER filesize;
85 #endif /* HAVE_GET_FILE_SIZE_EX */
87 dev = CreateFile(file, GENERIC_READ,
88 FILE_SHARE_READ | FILE_SHARE_WRITE ,
89 NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
91 if (dev == INVALID_HANDLE_VALUE)
93 if (DeviceIoControl(dev, IOCTL_DISK_GET_PARTITION_INFO,
94 &pi, sizeof(PARTITION_INFORMATION),
95 &pi, sizeof(PARTITION_INFORMATION),
98 *retblocks = pi.PartitionLength.QuadPart / blocksize;
100 } else if (DeviceIoControl(dev, IOCTL_DISK_GET_DRIVE_GEOMETRY,
101 &gi, sizeof(DISK_GEOMETRY),
102 &gi, sizeof(DISK_GEOMETRY),
105 *retblocks = gi.BytesPerSector *
107 gi.TracksPerCylinder *
108 gi.Cylinders.QuadPart / blocksize;
110 #ifdef HAVE_GET_FILE_SIZE_EX
111 } else if (GetFileSizeEx(dev, &filesize)) {
112 *retblocks = filesize.QuadPart / blocksize;
116 filesize = GetFileSize(dev, NULL);
117 if (INVALID_FILE_SIZE != filesize) {
118 *retblocks = filesize / blocksize;
121 #endif /* HAVE_GET_FILE_SIZE_EX */
129 static int valid_offset (int fd, ext2_loff_t offset)
133 if (ext2fs_llseek (fd, offset, 0) < 0)
135 if (read (fd, &ch, 1) < 1)
141 * Returns the number of blocks in a partition
143 errcode_t ext2fs_get_device_size2(const char *file, int blocksize,
147 unsigned long long size64;
148 ext2_loff_t high, low;
150 fd = ext2fs_open_file(file, O_RDONLY, 0);
154 #ifdef DKIOCGETBLOCKCOUNT /* For Apple Darwin */
155 if (ioctl(fd, DKIOCGETBLOCKCOUNT, &size64) >= 0) {
156 *retblocks = size64 / (blocksize / 512);
163 int valid_blkgetsize64 = 1;
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;
172 if (valid_blkgetsize64 &&
173 ioctl(fd, BLKGETSIZE64, &size64) >= 0) {
174 *retblocks = size64 / blocksize;
178 #endif /* BLKGETSIZE64 */
184 if (ioctl(fd, BLKGETSIZE, &size) >= 0) {
185 *retblocks = size / (blocksize / 512);
193 struct floppy_struct this_floppy;
195 if (ioctl(fd, FDGETPRM, &this_floppy) >= 0) {
196 *retblocks = this_floppy.size / (blocksize / 512);
202 #ifdef HAVE_SYS_DISKLABEL_H
205 struct disklabel lab;
206 struct partition *pp;
209 #if defined(DIOCGMEDIASIZE)
213 if (ioctl(fd, DIOCGMEDIASIZE, &ms) >= 0) {
214 *retblocks = ms / blocksize;
218 #elif defined(DIOCGDINFO)
219 /* old disklabel interface */
220 part = strlen(file) - 1;
225 else if (ch >= 'a' && ch <= 'h')
230 if (part >= 0 && (ioctl(fd, DIOCGDINFO, (char *)&lab) >= 0)) {
231 pp = &lab.d_partitions[part];
233 *retblocks = pp->p_size / (blocksize / 512);
237 #endif /* defined(DIOCG*) */
239 #endif /* HAVE_SYS_DISKLABEL_H */
242 ext2fs_struct_stat st;
244 if (ext2fs_fstat(fd, &st) == 0)
245 if (S_ISREG(st.st_mode)) {
246 *retblocks = st.st_size / blocksize;
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.
257 for (high = 1024; valid_offset(fd, high); high *= 2)
259 while (low < high - 1) {
260 const ext2_loff_t mid = (low + high) / 2;
262 if (valid_offset (fd, mid))
269 *retblocks = size64 / blocksize;
275 errcode_t ext2fs_get_device_size(const char *file, int blocksize,
281 retval = ext2fs_get_device_size2(file, blocksize, &blocks);
284 if (blocks >= (1ULL << 32))
286 *retblocks = (blk_t) blocks;
293 int main(int argc, char **argv)
299 fprintf(stderr, "Usage: %s device\n", argv[0]);
303 retval = ext2fs_get_device_size(argv[1], 1024, &blocks);
305 com_err(argv[0], retval,
306 "while calling ext2fs_get_device_size");
309 printf("Device %s has %u 1k blocks.\n", argv[1], blocks);