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Root/tags/2.0/i386/util/fdisk/disk.c

Source at commit 1808 created 12 years 4 months ago.
By blackosx, Revise layout of package installer 'Welcome' file so it looks cleaner. Change the copyright notice to begin from 2009 as seen in the Chameleon 2.0 r431 installer. Should this date be set earlier?
1/*␊
2 * Copyright (c) 2002 Apple Computer, Inc. All rights reserved.␊
3 *␊
4 * @APPLE_LICENSE_HEADER_START@␊
5 * ␊
6 * This file contains Original Code and/or Modifications of Original Code␊
7 * as defined in and that are subject to the Apple Public Source License␊
8 * Version 2.0 (the 'License'). You may not use this file except in␊
9 * compliance with the License. Please obtain a copy of the License at␊
10 * http://www.opensource.apple.com/apsl/ and read it before using this␊
11 * file.␊
12 * ␊
13 * The Original Code and all software distributed under the License are␊
14 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER␊
15 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,␊
16 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,␊
17 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.␊
18 * Please see the License for the specific language governing rights and␊
19 * limitations under the License.␊
20 * ␊
21 * @APPLE_LICENSE_HEADER_END@␊
22 */␊
23␊
24/*␊
25 * Copyright (c) 1997, 2001 Tobias Weingartner␊
26 * All rights reserved.␊
27 *␊
28 * Redistribution and use in source and binary forms, with or without␊
29 * modification, are permitted provided that the following conditions␊
30 * are met:␊
31 * 1. Redistributions of source code must retain the above copyright␊
32 * notice, this list of conditions and the following disclaimer.␊
33 * 2. Redistributions in binary form must reproduce the above copyright␊
34 * notice, this list of conditions and the following disclaimer in the␊
35 * documentation and/or other materials provided with the distribution.␊
36 * 3. All advertising materials mentioning features or use of this software␊
37 * must display the following acknowledgement:␊
38 * This product includes software developed by Tobias Weingartner.␊
39 * 4. The name of the author may not be used to endorse or promote products␊
40 * derived from this software without specific prior written permission.␊
41 *␊
42 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR␊
43 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES␊
44 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.␊
45 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,␊
46 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT␊
47 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,␊
48 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY␊
49 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT␊
50 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF␊
51 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.␊
52 */␊
53␊
54#include <err.h>␊
55#include <util.h>␊
56#include <stdio.h>␊
57#include <stdlib.h>␊
58#include <unistd.h>␊
59#include <string.h>␊
60#include <sys/fcntl.h>␊
61#include <sys/ioctl.h>␊
62#include <sys/types.h>␊
63#include <sys/stat.h>␊
64#include <sys/reboot.h>␊
65#include <sys/disk.h>␊
66#include <sys/param.h>␊
67#include <sys/sysctl.h>␊
68#ifdef __i386__␊
69#include <pexpert/i386/boot.h>␊
70#endif␊
71#include "disk.h"␊
72␊
73int␊
74DISK_open(disk, mode)␊
75␉char *disk;␊
76␉int mode;␊
77{␊
78␉int fd;␊
79␉struct stat st;␊
80␊
81␉fd = open(disk, mode);␊
82␉if (fd == -1)␊
83␉␉err(1, "%s", disk);␊
84␉if (fstat(fd, &st) == -1)␊
85␉␉err(1, "%s", disk);␊
86␉/* Don't be so picky about needing a character device */␊
87␉if (!S_ISCHR(st.st_mode) && !S_ISBLK(st.st_mode) && !S_ISREG(st.st_mode))␊
88␉␉errx(1, "%s is not a character device or a regular file", disk);␊
89␉return (fd);␊
90}␊
91␊
92int␊
93DISK_openshared(disk, mode, shared)␊
94␉char *disk;␊
95␉int mode;␊
96␉int *shared;␊
97{␊
98␉int fd;␊
99␉struct stat st;␊
100␉*shared = 0;␊
101␊
102␉fd = open(disk, mode|O_EXLOCK);␊
103␉if (fd == -1) {␊
104␉ // if we can't have exclusive access, attempt␊
105␉ // to gracefully degrade to shared access␊
106␉ fd = open(disk, mode|O_SHLOCK);␊
107␉ if(fd == -1)␊
108␉␉err(1, "%s", disk);␊
109␊
110␉ *shared = 1;␊
111␉}␊
112␊
113␉if (fstat(fd, &st) == -1)␊
114␉␉err(1, "%s", disk);␊
115␉/* Don't be so picky about needing a character device */␊
116␉if (!S_ISCHR(st.st_mode) && !S_ISBLK(st.st_mode) && !S_ISREG(st.st_mode))␊
117␉␉errx(1, "%s is not a character device or a regular file", disk);␊
118␉return (fd);␊
119}␊
120␊
121int␊
122DISK_close(fd)␊
123␉int fd;␊
124{␊
125␊
126␉return (close(fd));␊
127}␊
128␊
129/* Given a size in the metrics,␊
130 * fake up a CHS geometry.␊
131 */␊
132void␊
133DISK_fake_CHS(DISK_metrics *lm)␊
134{␊
135 int heads = 4;␊
136 int spt = 63;␊
137 int cylinders = (lm->size / heads / spt);␊
138␊
139 while (cylinders > 1024 && heads < 256) {␊
140 heads *= 2;␊
141 cylinders /= 2;␊
142 }␊
143 if (heads == 256) {␊
144 heads = 255;␊
145 cylinders = (lm->size / heads / spt);␊
146 }␉␊
147 lm->cylinders = cylinders;␊
148 lm->heads = heads;␊
149 lm->sectors = spt;␊
150}␊
151␊
152/* Routine to go after the disklabel for geometry␊
153 * information. This should work everywhere, but␊
154 * in the land of PC, things are not always what␊
155 * they seem.␊
156 */␊
157DISK_metrics *␊
158DISK_getlabelmetrics(name)␊
159␉char *name;␊
160{␊
161␉DISK_metrics *lm = NULL;␊
162␉long long size;␊
163␉uint32_t sector_size;␊
164␉int fd;␊
165␉struct stat st;␊
166␊
167␉/* Get label metrics */␊
168␉if ((fd = DISK_open(name, O_RDONLY)) != -1) {␊
169␉␉lm = malloc(sizeof(DISK_metrics));␊
170␊
171␉␉if (fstat(fd, &st) == -1)␊
172␉␉ err(1, "%s", name);␊
173␉␉if (!S_ISREG(st.st_mode) || S_ISBLK(st.st_mode)) {␊
174␉␉ if (ioctl(fd, DKIOCGETBLOCKCOUNT, &size) == -1) {␊
175␉␉ err(1, "Could not get disk block count");␊
176␉␉ free(lm);␊
177␉␉ return NULL;␊
178␉␉ }␊
179␉␉ if (ioctl(fd, DKIOCGETBLOCKSIZE, &sector_size) == -1) {␊
180␉␉ err(1, "Could not get disk block size");␊
181␉␉ free(lm);␊
182␉␉ return NULL;␊
183␉␉ }␊
184␉␉} else {␊
185␉␉ sector_size = 512;␊
186␉␉ size = st.st_size / sector_size;␊
187␉␉}␊
188␊
189␉␉lm->sector_size = sector_size;␊
190␉␉lm->size = size;␊
191␉␉DISK_fake_CHS(lm);␊
192␉␉DISK_close(fd);␊
193␉}␊
194␊
195␉return (lm);␊
196}␊
197␊
198/*␊
199 * Don't try to get BIOS disk metrics.␊
200 */␊
201DISK_metrics *␊
202DISK_getbiosmetrics(name)␊
203␉char *name;␊
204{␊
205␉return (NULL);␊
206}␊
207␊
208/* This is ugly, and convoluted. All the magic␊
209 * for disk geo/size happens here. Basically,␊
210 * the real size is the one we will use in the␊
211 * rest of the program, the label size is what we␊
212 * got from the disklabel. If the disklabel fails,␊
213 * we assume we are working with a normal file,␊
214 * and should request the user to specify the␊
215 * geometry he/she wishes to use.␊
216 */␊
217int␊
218DISK_getmetrics(disk, user)␊
219␉disk_t *disk;␊
220␉DISK_metrics *user;␊
221{␊
222␊
223␉disk->label = DISK_getlabelmetrics(disk->name);␊
224␉disk->bios = DISK_getbiosmetrics(disk->name);␊
225␊
226␉/* If user supplied, use that */␊
227␉if (user) {␊
228␉␉disk->real = user;␊
229␉␉return (0);␊
230␉}␊
231␊
232␉/* Fixup bios metrics to include cylinders past 1023 boundary */␊
233␉if(disk->label && disk->bios){␊
234␉␉int cyls, secs;␊
235␊
236␉␉cyls = disk->label->size / (disk->bios->heads * disk->bios->sectors);␊
237␉␉secs = cyls * (disk->bios->heads * disk->bios->sectors);␊
238␉␉if ((disk->label->size - secs) < 0)␊
239␉␉␉errx(1, "BIOS fixup botch (%d sectors)", disk->label->size - secs);␊
240␉␉disk->bios->cylinders = cyls;␊
241␉␉disk->bios->size = secs;␊
242␉}␊
243␊
244␉/* If we have a (fixed) BIOS geometry, use that */␊
245␉if (disk->bios) {␊
246␉␉disk->real = disk->bios;␊
247␉␉return (0);␊
248␉}␊
249␊
250␉/* If we have a label, use that */␊
251␉if (disk->label) {␊
252␉␉disk->real = disk->label;␊
253␉␉return (0);␊
254␉}␊
255␊
256␉/* Can not get geometry, punt */␊
257␉disk->real = NULL;␊
258␉return (1);␊
259}␊
260␊
261/* Get the disk's native sector size, updating the metrics' sector_size field.␊
262 */␊
263 int␊
264DISK_get_sector_size(disk, user)␊
265 disk_t *disk;␊
266 DISK_metrics *user;␊
267{␊
268 int ret;␊
269 int fd;␊
270 uint32_t sector_size;␊
271 ␊
272 /* Default to 512 bytes per sector, in case of failure. */␊
273 user->sector_size = 512;␊
274 ret = 1;␊
275 ␊
276 fd = DISK_open(disk->name, O_RDONLY);␊
277 if (fd == -1) {␊
278␉err(1, "Could not open %s", disk->name);␊
279 } else {␊
280 if (ioctl(fd, DKIOCGETBLOCKSIZE, &sector_size) == -1) {␊
281 err(1, "Could not get disk block size");␊
282 } else {␊
283 user->sector_size = sector_size;␊
284 ret = 0;␊
285 }␊
286 }␊
287 ␊
288 return ret;␊
289}␊
290␊
291int␊
292DISK_printmetrics(disk)␊
293␉disk_t *disk;␊
294{␊
295␊
296␉printf("Disk: %s\t", disk->name);␊
297␉if (disk->real) {␊
298␉␉printf("geometry: %d/%d/%d [%d sectors]\n", disk->real->cylinders,␊
299␉␉ disk->real->heads, disk->real->sectors, disk->real->size);␊
300␉␉if (disk->real->sector_size != 512)␊
301␉␉␉printf("Sector size: %d bytes\n", disk->real->sector_size);␊
302␉} else {␊
303␉␉printf("geometry: <none>\n");␊
304␉}␊
305␊
306␉return (0);␊
307}␊
308␊
309

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