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 | ␊ |
73 | int␊ |
74 | DISK_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 | ␊ |
92 | int␊ |
93 | DISK_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 | ␊ |
121 | int␊ |
122 | DISK_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 | */␊ |
132 | void␊ |
133 | DISK_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 | */␊ |
157 | DISK_metrics *␊ |
158 | DISK_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, §or_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 | */␊ |
201 | DISK_metrics *␊ |
202 | DISK_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 | */␊ |
217 | int␊ |
218 | DISK_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␊ |
264 | DISK_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, §or_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 | ␊ |
291 | int␊ |
292 | DISK_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 | |