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
ext2fs_get_device_size2(const char * file,int blocksize,blk64_t * retblocks)74 errcode_t ext2fs_get_device_size2(const char *file, int blocksize,
75 blk64_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
valid_offset(int fd,ext2_loff_t offset)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 */
ext2fs_get_device_size2(const char * file,int blocksize,blk64_t * retblocks)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 #if defined DKIOCGETBLOCKCOUNT && defined DKIOCGETBLOCKSIZE /* For Apple Darwin */
155 unsigned int size;
156
157 if (ioctl(fd, DKIOCGETBLOCKCOUNT, &size64) >= 0 &&
158 ioctl(fd, DKIOCGETBLOCKSIZE, &size) >= 0) {
159 *retblocks = size64 * size / blocksize;
160 goto out;
161 }
162 #endif
163
164 #ifdef BLKGETSIZE64
165 {
166 int valid_blkgetsize64 = 1;
167 #ifdef __linux__
168 struct utsname ut;
169
170 if ((uname(&ut) == 0) &&
171 ((ut.release[0] == '2') && (ut.release[1] == '.') &&
172 (ut.release[2] < '6') && (ut.release[3] == '.')))
173 valid_blkgetsize64 = 0;
174 #endif
175 if (valid_blkgetsize64 &&
176 ioctl(fd, BLKGETSIZE64, &size64) >= 0) {
177 *retblocks = size64 / blocksize;
178 goto out;
179 }
180 }
181 #endif /* BLKGETSIZE64 */
182
183 #ifdef BLKGETSIZE
184 {
185 unsigned long size;
186
187 if (ioctl(fd, BLKGETSIZE, &size) >= 0) {
188 *retblocks = size / (blocksize / 512);
189 goto out;
190 }
191 }
192 #endif
193
194 #ifdef FDGETPRM
195 {
196 struct floppy_struct this_floppy;
197
198 if (ioctl(fd, FDGETPRM, &this_floppy) >= 0) {
199 *retblocks = this_floppy.size / (blocksize / 512);
200 goto out;
201 }
202 }
203 #endif
204
205 #ifdef HAVE_SYS_DISKLABEL_H
206 {
207 int part;
208 struct disklabel lab;
209 struct partition *pp;
210 char ch;
211
212 #if defined(DIOCGMEDIASIZE)
213 {
214 off_t ms;
215 u_int bs;
216 if (ioctl(fd, DIOCGMEDIASIZE, &ms) >= 0) {
217 *retblocks = ms / blocksize;
218 goto out;
219 }
220 }
221 #elif defined(DIOCGDINFO)
222 /* old disklabel interface */
223 part = strlen(file) - 1;
224 if (part >= 0) {
225 ch = file[part];
226 if (isdigit(ch))
227 part = 0;
228 else if (ch >= 'a' && ch <= 'h')
229 part = ch - 'a';
230 else
231 part = -1;
232 }
233 if (part >= 0 && (ioctl(fd, DIOCGDINFO, (char *)&lab) >= 0)) {
234 pp = &lab.d_partitions[part];
235 if (pp->p_size) {
236 *retblocks = pp->p_size / (blocksize / 512);
237 goto out;
238 }
239 }
240 #endif /* defined(DIOCG*) */
241 }
242 #endif /* HAVE_SYS_DISKLABEL_H */
243
244 {
245 ext2fs_struct_stat st;
246
247 if (ext2fs_fstat(fd, &st) == 0)
248 if (S_ISREG(st.st_mode)) {
249 *retblocks = st.st_size / blocksize;
250 goto out;
251 }
252 }
253
254 /*
255 * OK, we couldn't figure it out by using a specialized ioctl,
256 * which is generally the best way. So do binary search to
257 * find the size of the partition.
258 */
259 low = 0;
260 for (high = 1024; valid_offset(fd, high); high *= 2)
261 low = high;
262 while (low < high - 1) {
263 const ext2_loff_t mid = (low + high) / 2;
264
265 if (valid_offset (fd, mid))
266 low = mid;
267 else
268 high = mid;
269 }
270 valid_offset(fd, 0);
271 size64 = low + 1;
272 *retblocks = size64 / blocksize;
273 out:
274 close(fd);
275 return rc;
276 }
277
278 #endif /* WIN32 */
279
ext2fs_get_device_size(const char * file,int blocksize,blk_t * retblocks)280 errcode_t ext2fs_get_device_size(const char *file, int blocksize,
281 blk_t *retblocks)
282 {
283 errcode_t retval;
284 blk64_t blocks;
285
286 retval = ext2fs_get_device_size2(file, blocksize, &blocks);
287 if (retval)
288 return retval;
289 if (blocks >= (1ULL << 32))
290 return EFBIG;
291 *retblocks = (blk_t) blocks;
292 return 0;
293 }
294
295 #ifdef DEBUG
main(int argc,char ** argv)296 int main(int argc, char **argv)
297 {
298 blk_t blocks;
299 int retval;
300
301 if (argc < 2) {
302 fprintf(stderr, "Usage: %s device\n", argv[0]);
303 exit(1);
304 }
305
306 retval = ext2fs_get_device_size(argv[1], 1024, &blocks);
307 if (retval) {
308 com_err(argv[0], retval,
309 "while calling ext2fs_get_device_size");
310 exit(1);
311 }
312 printf("Device %s has %u 1k blocks.\n", argv[1], blocks);
313 exit(0);
314 }
315 #endif
316