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
ext2fs_get_device_size(const char * file,int blocksize,blk_t * retblocks)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
valid_offset(int fd,ext2_loff_t offset)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 */
ext2fs_get_device_size2(const char * file,int blocksize,blk64_t * retblocks)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
ext2fs_get_device_size(const char * file,int blocksize,blk_t * retblocks)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
main(int argc,char ** argv)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