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 int fd;
78 HANDLE h;
79 PARTITION_INFORMATION pi;
80 DISK_GEOMETRY gi;
81 DWORD retbytes;
82 #ifdef HAVE_GET_FILE_SIZE_EX
83 LARGE_INTEGER filesize;
84 #else
85 DWORD filesize;
86 #endif /* HAVE_GET_FILE_SIZE_EX */
87
88 fd = ext2fs_open_file(file, O_RDONLY, 0);
89 if (fd < 0)
90 return errno;
91 h = (HANDLE)_get_osfhandle(fd);
92 if (DeviceIoControl(h, IOCTL_DISK_GET_PARTITION_INFO,
93 &pi, sizeof(PARTITION_INFORMATION),
94 &pi, sizeof(PARTITION_INFORMATION),
95 &retbytes, NULL)) {
96
97 *retblocks = pi.PartitionLength.QuadPart / blocksize;
98
99 } else if (DeviceIoControl(h, IOCTL_DISK_GET_DRIVE_GEOMETRY,
100 &gi, sizeof(DISK_GEOMETRY),
101 &gi, sizeof(DISK_GEOMETRY),
102 &retbytes, NULL)) {
103
104 *retblocks = gi.BytesPerSector *
105 gi.SectorsPerTrack *
106 gi.TracksPerCylinder *
107 gi.Cylinders.QuadPart / blocksize;
108
109 #ifdef HAVE_GET_FILE_SIZE_EX
110 } else if (GetFileSizeEx(h, &filesize)) {
111 *retblocks = filesize.QuadPart / blocksize;
112 }
113 #else
114 } else {
115 filesize = GetFileSize(h, NULL);
116 if (INVALID_FILE_SIZE != filesize) {
117 *retblocks = filesize / blocksize;
118 }
119 }
120 #endif /* HAVE_GET_FILE_SIZE_EX */
121
122 close(fd);
123 return 0;
124 }
125
126 #else
127
valid_offset(int fd,ext2_loff_t offset)128 static int valid_offset (int fd, ext2_loff_t offset)
129 {
130 char ch;
131
132 if (ext2fs_llseek (fd, offset, 0) < 0)
133 return 0;
134 if (read (fd, &ch, 1) < 1)
135 return 0;
136 return 1;
137 }
138
139 /*
140 * Returns the number of blocks in a partition
141 */
ext2fs_get_device_size2(const char * file,int blocksize,blk64_t * retblocks)142 errcode_t ext2fs_get_device_size2(const char *file, int blocksize,
143 blk64_t *retblocks)
144 {
145 int fd, rc = 0;
146 unsigned long long size64;
147 ext2_loff_t high, low;
148
149 fd = ext2fs_open_file(file, O_RDONLY, 0);
150 if (fd < 0)
151 return errno;
152
153 #if defined DKIOCGETBLOCKCOUNT && defined DKIOCGETBLOCKSIZE /* For Apple Darwin */
154 unsigned int size;
155
156 if (ioctl(fd, DKIOCGETBLOCKCOUNT, &size64) >= 0 &&
157 ioctl(fd, DKIOCGETBLOCKSIZE, &size) >= 0) {
158 *retblocks = size64 * size / blocksize;
159 goto out;
160 }
161 #endif
162
163 #ifdef BLKGETSIZE64
164 {
165 int valid_blkgetsize64 = 1;
166 #ifdef __linux__
167 struct utsname ut;
168
169 if ((uname(&ut) == 0) &&
170 ((ut.release[0] == '2') && (ut.release[1] == '.') &&
171 (ut.release[2] < '6') && (ut.release[3] == '.')))
172 valid_blkgetsize64 = 0;
173 #endif
174 if (valid_blkgetsize64 &&
175 ioctl(fd, BLKGETSIZE64, &size64) >= 0) {
176 *retblocks = size64 / blocksize;
177 goto out;
178 }
179 }
180 #endif /* BLKGETSIZE64 */
181
182 #ifdef BLKGETSIZE
183 {
184 unsigned long size;
185
186 if (ioctl(fd, BLKGETSIZE, &size) >= 0) {
187 *retblocks = size / (blocksize / 512);
188 goto out;
189 }
190 }
191 #endif
192
193 #ifdef FDGETPRM
194 {
195 struct floppy_struct this_floppy;
196
197 if (ioctl(fd, FDGETPRM, &this_floppy) >= 0) {
198 *retblocks = this_floppy.size / (blocksize / 512);
199 goto out;
200 }
201 }
202 #endif
203
204 #ifdef HAVE_SYS_DISKLABEL_H
205 {
206 int part;
207 struct disklabel lab;
208 struct partition *pp;
209 char ch;
210
211 #if defined(DIOCGMEDIASIZE)
212 {
213 off_t ms;
214 u_int bs;
215 if (ioctl(fd, DIOCGMEDIASIZE, &ms) >= 0) {
216 *retblocks = ms / blocksize;
217 goto out;
218 }
219 }
220 #elif defined(DIOCGDINFO)
221 /* old disklabel interface */
222 part = strlen(file) - 1;
223 if (part >= 0) {
224 ch = file[part];
225 if (isdigit(ch))
226 part = 0;
227 else if (ch >= 'a' && ch <= 'h')
228 part = ch - 'a';
229 else
230 part = -1;
231 }
232 if (part >= 0 && (ioctl(fd, DIOCGDINFO, (char *)&lab) >= 0)) {
233 pp = &lab.d_partitions[part];
234 if (pp->p_size) {
235 *retblocks = pp->p_size / (blocksize / 512);
236 goto out;
237 }
238 }
239 #endif /* defined(DIOCG*) */
240 }
241 #endif /* HAVE_SYS_DISKLABEL_H */
242
243 {
244 ext2fs_struct_stat st;
245
246 if (ext2fs_fstat(fd, &st) == 0)
247 if (S_ISREG(st.st_mode)) {
248 *retblocks = st.st_size / blocksize;
249 goto out;
250 }
251 }
252
253 /*
254 * OK, we couldn't figure it out by using a specialized ioctl,
255 * which is generally the best way. So do binary search to
256 * find the size of the partition.
257 */
258 low = 0;
259 for (high = 1024; valid_offset(fd, high); high *= 2)
260 low = high;
261 while (low < high - 1) {
262 const ext2_loff_t mid = (low + high) / 2;
263
264 if (valid_offset (fd, mid))
265 low = mid;
266 else
267 high = mid;
268 }
269 valid_offset(fd, 0);
270 size64 = low + 1;
271 *retblocks = size64 / blocksize;
272 out:
273 close(fd);
274 return rc;
275 }
276
277 #endif /* WIN32 */
278
ext2fs_get_device_size(const char * file,int blocksize,blk_t * retblocks)279 errcode_t ext2fs_get_device_size(const char *file, int blocksize,
280 blk_t *retblocks)
281 {
282 errcode_t retval;
283 blk64_t blocks;
284
285 retval = ext2fs_get_device_size2(file, blocksize, &blocks);
286 if (retval)
287 return retval;
288 if (blocks >= (1ULL << 32))
289 return EFBIG;
290 *retblocks = (blk_t) blocks;
291 return 0;
292 }
293
294 #ifdef DEBUG
main(int argc,char ** argv)295 int main(int argc, char **argv)
296 {
297 blk64_t blocks;
298 int retval;
299
300 if (argc < 2) {
301 fprintf(stderr, "Usage: %s device\n", argv[0]);
302 exit(1);
303 }
304
305 retval = ext2fs_get_device_size2(argv[1], 1024, &blocks);
306 if (retval) {
307 com_err(argv[0], retval,
308 "while calling ext2fs_get_device_size");
309 exit(1);
310 }
311 printf("Device %s has %llu 1k blocks.\n", argv[1],
312 (unsigned long long) locks);
313 exit(0);
314 }
315 #endif
316