Convert a chunk of usage.h to USE_ and SKIP_ (more to do there), and fix a
[oweals/busybox.git] / e2fsprogs / ext2fs / getsize.c
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 Public
11  * License.
12  * %End-Header%
13  */
14
15 #include <stdio.h>
16 #if HAVE_UNISTD_H
17 #include <unistd.h>
18 #endif
19 #if HAVE_ERRNO_H
20 #include <errno.h>
21 #endif
22 #include <fcntl.h>
23 #ifdef HAVE_SYS_IOCTL_H
24 #include <sys/ioctl.h>
25 #endif
26 #ifdef HAVE_LINUX_FD_H
27 #include <linux/fd.h>
28 #endif
29 #ifdef HAVE_SYS_DISKLABEL_H
30 #include <sys/disklabel.h>
31 #endif
32 #ifdef HAVE_SYS_DISK_H
33 #ifdef HAVE_SYS_QUEUE_H
34 #include <sys/queue.h> /* for LIST_HEAD */
35 #endif
36 #include <sys/disk.h>
37 #endif
38 #ifdef __linux__
39 #include <sys/utsname.h>
40 #endif
41
42 #if defined(__linux__) && defined(_IO) && !defined(BLKGETSIZE)
43 #define BLKGETSIZE _IO(0x12,96) /* return device size */
44 #endif
45
46 #if defined(__linux__) && defined(_IOR) && !defined(BLKGETSIZE64)
47 #define BLKGETSIZE64 _IOR(0x12,114,size_t)      /* return device size in bytes (u64 *arg) */
48 #endif
49
50 #ifdef APPLE_DARWIN
51 #define BLKGETSIZE DKIOCGETBLOCKCOUNT32
52 #endif /* APPLE_DARWIN */
53
54 #include "ext2_fs.h"
55 #include "ext2fs.h"
56
57 #if defined(__CYGWIN__) || defined (WIN32)
58 #include <windows.h>
59 #include <winioctl.h>
60
61 #if (_WIN32_WINNT >= 0x0500)
62 #define HAVE_GET_FILE_SIZE_EX 1
63 #endif
64
65 errcode_t ext2fs_get_device_size(const char *file, int blocksize,
66                                  blk_t *retblocks)
67 {
68         HANDLE dev;
69         PARTITION_INFORMATION pi;
70         DISK_GEOMETRY gi;
71         DWORD retbytes;
72 #ifdef HAVE_GET_FILE_SIZE_EX
73         LARGE_INTEGER filesize;
74 #else
75         DWORD filesize;
76 #endif /* HAVE_GET_FILE_SIZE_EX */
77
78         dev = CreateFile(file, GENERIC_READ,
79                          FILE_SHARE_READ | FILE_SHARE_WRITE ,
80                          NULL,  OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL,  NULL);
81
82         if (dev == INVALID_HANDLE_VALUE)
83                 return EBADF;
84         if (DeviceIoControl(dev, IOCTL_DISK_GET_PARTITION_INFO,
85                             &pi, sizeof(PARTITION_INFORMATION),
86                             &pi, sizeof(PARTITION_INFORMATION),
87                             &retbytes, NULL)) {
88
89                 *retblocks = pi.PartitionLength.QuadPart / blocksize;
90
91         } else if (DeviceIoControl(dev, IOCTL_DISK_GET_DRIVE_GEOMETRY,
92                                 &gi, sizeof(DISK_GEOMETRY),
93                                 &gi, sizeof(DISK_GEOMETRY),
94                                 &retbytes, NULL)) {
95
96                 *retblocks = gi.BytesPerSector *
97                              gi.SectorsPerTrack *
98                              gi.TracksPerCylinder *
99                              gi.Cylinders.QuadPart / blocksize;
100
101 #ifdef HAVE_GET_FILE_SIZE_EX
102         } else if (GetFileSizeEx(dev, &filesize)) {
103                 *retblocks = filesize.QuadPart / blocksize;
104         }
105 #else
106         } else {
107                 filesize = GetFileSize(dev, NULL);
108                 if (INVALID_FILE_SIZE != filesize) {
109                         *retblocks = filesize / blocksize;
110                 }
111         }
112 #endif /* HAVE_GET_FILE_SIZE_EX */
113
114         CloseHandle(dev);
115         return 0;
116 }
117
118 #else
119
120 static int valid_offset (int fd, ext2_loff_t offset)
121 {
122         char ch;
123
124         if (ext2fs_llseek (fd, offset, 0) < 0)
125                 return 0;
126         if (read (fd, &ch, 1) < 1)
127                 return 0;
128         return 1;
129 }
130
131 /*
132  * Returns the number of blocks in a partition
133  */
134 errcode_t ext2fs_get_device_size(const char *file, int blocksize,
135                                  blk_t *retblocks)
136 {
137         int     fd;
138         int valid_blkgetsize64 = 1;
139 #ifdef __linux__
140         struct          utsname ut;
141 #endif
142         unsigned long long size64;
143         unsigned long   size;
144         ext2_loff_t high, low;
145 #ifdef FDGETPRM
146         struct floppy_struct this_floppy;
147 #endif
148 #ifdef HAVE_SYS_DISKLABEL_H
149         int part;
150         struct disklabel lab;
151         struct partition *pp;
152         char ch;
153 #endif /* HAVE_SYS_DISKLABEL_H */
154
155 #ifdef CONFIG_LFS
156         fd = open64(file, O_RDONLY);
157 #else
158         fd = open(file, O_RDONLY);
159 #endif
160         if (fd < 0)
161                 return errno;
162
163 #ifdef DKIOCGETBLOCKCOUNT       /* For Apple Darwin */
164         if (ioctl(fd, DKIOCGETBLOCKCOUNT, &size64) >= 0) {
165                 if ((sizeof(*retblocks) < sizeof(unsigned long long))
166                     && ((size64 / (blocksize / 512)) > 0xFFFFFFFF))
167                         return EFBIG;
168                 close(fd);
169                 *retblocks = size64 / (blocksize / 512);
170                 return 0;
171         }
172 #endif
173
174 #ifdef BLKGETSIZE64
175 #ifdef __linux__
176         if ((uname(&ut) == 0) &&
177             ((ut.release[0] == '2') && (ut.release[1] == '.') &&
178              (ut.release[2] < '6') && (ut.release[3] == '.')))
179                 valid_blkgetsize64 = 0;
180 #endif
181         if (valid_blkgetsize64 &&
182             ioctl(fd, BLKGETSIZE64, &size64) >= 0) {
183                 if ((sizeof(*retblocks) < sizeof(unsigned long long))
184                     && ((size64 / blocksize) > 0xFFFFFFFF))
185                         return EFBIG;
186                 close(fd);
187                 *retblocks = size64 / blocksize;
188                 return 0;
189         }
190 #endif
191
192 #ifdef BLKGETSIZE
193         if (ioctl(fd, BLKGETSIZE, &size) >= 0) {
194                 close(fd);
195                 *retblocks = size / (blocksize / 512);
196                 return 0;
197         }
198 #endif
199
200 #ifdef FDGETPRM
201         if (ioctl(fd, FDGETPRM, &this_floppy) >= 0) {
202                 close(fd);
203                 *retblocks = this_floppy.size / (blocksize / 512);
204                 return 0;
205         }
206 #endif
207
208 #ifdef HAVE_SYS_DISKLABEL_H
209 #if defined(DIOCGMEDIASIZE)
210         {
211             off_t ms;
212             u_int bs;
213             if (ioctl(fd, DIOCGMEDIASIZE, &ms) >= 0) {
214                 *retblocks = ms / blocksize;
215                 return 0;
216             }
217         }
218 #elif defined(DIOCGDINFO)
219         /* old disklabel interface */
220         part = strlen(file) - 1;
221         if (part >= 0) {
222                 ch = file[part];
223                 if (isdigit(ch))
224                         part = 0;
225                 else if (ch >= 'a' && ch <= 'h')
226                         part = ch - 'a';
227                 else
228                         part = -1;
229         }
230         if (part >= 0 && (ioctl(fd, DIOCGDINFO, (char *)&lab) >= 0)) {
231                 pp = &lab.d_partitions[part];
232                 if (pp->p_size) {
233                         close(fd);
234                         *retblocks = pp->p_size / (blocksize / 512);
235                         return 0;
236                 }
237         }
238 #endif /* defined(DIOCG*) */
239 #endif /* HAVE_SYS_DISKLABEL_H */
240
241         /*
242          * OK, we couldn't figure it out by using a specialized ioctl,
243          * which is generally the best way.  So do binary search to
244          * find the size of the partition.
245          */
246         low = 0;
247         for (high = 1024; valid_offset (fd, high); high *= 2)
248                 low = high;
249         while (low < high - 1)
250         {
251                 const ext2_loff_t mid = (low + high) / 2;
252
253                 if (valid_offset (fd, mid))
254                         low = mid;
255                 else
256                         high = mid;
257         }
258         valid_offset (fd, 0);
259         close(fd);
260         size64 = low + 1;
261         if ((sizeof(*retblocks) < sizeof(unsigned long long))
262             && ((size64 / blocksize) > 0xFFFFFFFF))
263                 return EFBIG;
264         *retblocks = size64 / blocksize;
265         return 0;
266 }
267
268 #endif /* WIN32 */
269
270 #ifdef DEBUG
271 int main(int argc, char **argv)
272 {
273         blk_t   blocks;
274         int     retval;
275
276         if (argc < 2) {
277                 fprintf(stderr, "Usage: %s device\n", argv[0]);
278                 exit(1);
279         }
280
281         retval = ext2fs_get_device_size(argv[1], 1024, &blocks);
282         if (retval) {
283                 com_err(argv[0], retval,
284                         "while calling ext2fs_get_device_size");
285                 exit(1);
286         }
287         printf("Device %s has %d 1k blocks.\n", argv[1], blocks);
288         exit(0);
289 }
290 #endif