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 HANDLE windows_get_handle(io_channel channel);
76 errcode_t ext2fs_get_device_size2(const char *file, int blocksize,
80 PARTITION_INFORMATION pi;
83 #ifdef HAVE_GET_FILE_SIZE_EX
84 LARGE_INTEGER filesize;
87 #endif /* HAVE_GET_FILE_SIZE_EX */
89 io_channel data_io = 0;
92 retval = windows_io_manager->open(file, 0, &data_io);
96 dev = windows_get_handle(data_io);
97 if (dev == INVALID_HANDLE_VALUE)
100 if (DeviceIoControl(dev, IOCTL_DISK_GET_PARTITION_INFO,
101 &pi, sizeof(PARTITION_INFORMATION),
102 &pi, sizeof(PARTITION_INFORMATION),
105 *retblocks = pi.PartitionLength.QuadPart / blocksize;
107 } else if (DeviceIoControl(dev, IOCTL_DISK_GET_DRIVE_GEOMETRY,
108 &gi, sizeof(DISK_GEOMETRY),
109 &gi, sizeof(DISK_GEOMETRY),
112 *retblocks = gi.BytesPerSector *
114 gi.TracksPerCylinder *
115 gi.Cylinders.QuadPart / blocksize;
117 #ifdef HAVE_GET_FILE_SIZE_EX
118 } else if (GetFileSizeEx(dev, &filesize)) {
119 *retblocks = filesize.QuadPart / blocksize;
123 filesize = GetFileSize(dev, NULL);
124 if (INVALID_FILE_SIZE != filesize) {
125 *retblocks = filesize / blocksize;
128 #endif /* HAVE_GET_FILE_SIZE_EX */
130 windows_io_manager->close(data_io);
137 static int valid_offset (int fd, ext2_loff_t offset)
141 if (ext2fs_llseek (fd, offset, 0) < 0)
143 if (read (fd, &ch, 1) < 1)
149 * Returns the number of blocks in a partition
151 errcode_t ext2fs_get_device_size2(const char *file, int blocksize,
155 unsigned long long size64;
156 ext2_loff_t high, low;
158 fd = ext2fs_open_file(file, O_RDONLY, 0);
162 #if defined DKIOCGETBLOCKCOUNT && defined DKIOCGETBLOCKSIZE /* For Apple Darwin */
165 if (ioctl(fd, DKIOCGETBLOCKCOUNT, &size64) >= 0 &&
166 ioctl(fd, DKIOCGETBLOCKSIZE, &size) >= 0) {
167 *retblocks = size64 * size / blocksize;
174 int valid_blkgetsize64 = 1;
178 if ((uname(&ut) == 0) &&
179 ((ut.release[0] == '2') && (ut.release[1] == '.') &&
180 (ut.release[2] < '6') && (ut.release[3] == '.')))
181 valid_blkgetsize64 = 0;
183 if (valid_blkgetsize64 &&
184 ioctl(fd, BLKGETSIZE64, &size64) >= 0) {
185 *retblocks = size64 / blocksize;
189 #endif /* BLKGETSIZE64 */
195 if (ioctl(fd, BLKGETSIZE, &size) >= 0) {
196 *retblocks = size / (blocksize / 512);
204 struct floppy_struct this_floppy;
206 if (ioctl(fd, FDGETPRM, &this_floppy) >= 0) {
207 *retblocks = this_floppy.size / (blocksize / 512);
213 #ifdef HAVE_SYS_DISKLABEL_H
216 struct disklabel lab;
217 struct partition *pp;
220 #if defined(DIOCGMEDIASIZE)
224 if (ioctl(fd, DIOCGMEDIASIZE, &ms) >= 0) {
225 *retblocks = ms / blocksize;
229 #elif defined(DIOCGDINFO)
230 /* old disklabel interface */
231 part = strlen(file) - 1;
236 else if (ch >= 'a' && ch <= 'h')
241 if (part >= 0 && (ioctl(fd, DIOCGDINFO, (char *)&lab) >= 0)) {
242 pp = &lab.d_partitions[part];
244 *retblocks = pp->p_size / (blocksize / 512);
248 #endif /* defined(DIOCG*) */
250 #endif /* HAVE_SYS_DISKLABEL_H */
253 ext2fs_struct_stat st;
255 if (ext2fs_fstat(fd, &st) == 0)
256 if (S_ISREG(st.st_mode)) {
257 *retblocks = st.st_size / blocksize;
263 * OK, we couldn't figure it out by using a specialized ioctl,
264 * which is generally the best way. So do binary search to
265 * find the size of the partition.
268 for (high = 1024; valid_offset(fd, high); high *= 2)
270 while (low < high - 1) {
271 const ext2_loff_t mid = (low + high) / 2;
273 if (valid_offset (fd, mid))
280 *retblocks = size64 / blocksize;
288 errcode_t ext2fs_get_device_size(const char *file, int blocksize,
294 retval = ext2fs_get_device_size2(file, blocksize, &blocks);
297 if (blocks >= (1ULL << 32))
299 *retblocks = (blk_t) blocks;
304 int main(int argc, char **argv)
310 fprintf(stderr, "Usage: %s device\n", argv[0]);
314 retval = ext2fs_get_device_size2(argv[1], 1024, &blocks);
316 com_err(argv[0], retval,
317 "while calling ext2fs_get_device_size");
320 printf("Device %s has %llu 1k blocks.\n", argv[1],
321 (unsigned long long) locks);