AMD64 - Fix many compile-time warnings. int/ptr type mismatches, %llx, etc.
[dragonfly.git] / sys / kern / subr_diskmbr.c
CommitLineData
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1/*-
2 * Copyright (c) 1994 Bruce D. Evans.
3 * All rights reserved.
4 *
5 * Copyright (c) 1982, 1986, 1988 Regents of the University of California.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by the University of
19 * California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 *
36 * from: @(#)ufs_disksubr.c 7.16 (Berkeley) 5/4/91
37 * from: ufs_disksubr.c,v 1.8 1994/06/07 01:21:39 phk Exp $
38 * $FreeBSD: src/sys/kern/subr_diskmbr.c,v 1.45 2000/01/28 10:22:07 bde Exp $
18cb7add 39 * $DragonFly: src/sys/kern/subr_diskmbr.c,v 1.26 2007/06/19 06:07:57 dillon Exp $
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40 */
41
42#include <sys/param.h>
43#include <sys/systm.h>
44#include <sys/buf.h>
45#include <sys/conf.h>
154b688d 46#include <sys/diskslice.h>
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47#define DOSPTYP_EXTENDED 5
48#define DOSPTYP_EXTENDEDX 15
49#define DOSPTYP_ONTRACK 84
50#include <sys/diskslice.h>
dc62b251 51#include <sys/diskmbr.h>
84f8b009 52#include <sys/disk.h>
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53#include <sys/malloc.h>
54#include <sys/syslog.h>
335dda38 55#include <sys/device.h>
984263bc 56
6ea70f76 57#define TRACE(str) do { if (dsi_debug) kprintf str; } while (0)
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58
59static volatile u_char dsi_debug;
60
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61/*
62 * This is what we have embedded in every boot1 for supporting the bogus
63 * "Dangerously Dedicated" mode. However, the old table is broken because
64 * it has an illegal geometry in it - it specifies 256 heads (heads = end
65 * head + 1) which causes nasty stuff when that wraps to zero in bios code.
66 * eg: divide by zero etc. This caused the dead-thinkpad problem, numerous
67 * SCSI bios crashes, EFI to crash, etc.
68 *
69 * We still have to recognize the old table though, even though we stopped
70 * inflicting it upon the world.
71 */
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72static struct dos_partition historical_bogus_partition_table[NDOSPART] = {
73 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, },
74 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, },
75 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, },
76 { 0x80, 0, 1, 0, DOSPTYP_386BSD, 255, 255, 255, 0, 50000, },
77};
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78static struct dos_partition historical_bogus_partition_table_fixed[NDOSPART] = {
79 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, },
80 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, },
81 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, },
82 { 0x80, 0, 1, 0, DOSPTYP_386BSD, 254, 255, 255, 0, 50000, },
83};
984263bc 84
402ed7e1 85static int check_part (char *sname, struct dos_partition *dp,
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86 u_int64_t offset, int nsectors, int ntracks,
87 u_int64_t mbr_offset);
84f8b009 88static void mbr_extended (cdev_t dev, struct disk_info *info,
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89 struct diskslices *ssp, u_int64_t ext_offset,
90 u_int64_t ext_size, u_int64_t base_ext_offset,
91 int nsectors, int ntracks, u_int64_t mbr_offset,
402ed7e1 92 int level);
84f8b009 93static int mbr_setslice (char *sname, struct disk_info *info,
984263bc 94 struct diskslice *sp, struct dos_partition *dp,
e0fc5693 95 u_int64_t br_offset);
984263bc 96
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97
98int
84f8b009 99mbrinit(cdev_t dev, struct disk_info *info, struct diskslices **sspp)
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100{
101 struct buf *bp;
102 u_char *cp;
103 int dospart;
104 struct dos_partition *dp;
105 struct dos_partition *dp0;
106 struct dos_partition dpcopy[NDOSPART];
107 int error;
108 int max_ncyls;
109 int max_nsectors;
110 int max_ntracks;
e0fc5693 111 u_int64_t mbr_offset;
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112 char partname[2];
113 u_long secpercyl;
114 char *sname;
115 struct diskslice *sp;
116 struct diskslices *ssp;
b13267a5 117 cdev_t wdev;
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118
119 mbr_offset = DOSBBSECTOR;
120reread_mbr:
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121 if (info->d_media_blksize & DEV_BMASK)
122 return (EIO);
984263bc 123 /* Read master boot record. */
8a88e0d0 124 wdev = dkmodpart(dkmodslice(dev, WHOLE_DISK_SLICE), WHOLE_SLICE_PART);
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125 bp = geteblk((int)info->d_media_blksize);
126 bp->b_bio1.bio_offset = (off_t)mbr_offset * info->d_media_blksize;
127 bp->b_bcount = info->d_media_blksize;
10f3fee5 128 bp->b_cmd = BUF_CMD_READ;
81b5c339 129 dev_dstrategy(wdev, &bp->b_bio1);
984263bc 130 if (biowait(bp) != 0) {
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131 diskerr(&bp->b_bio1, wdev,
132 "reading primary partition table: error",
a688b15c 133 LOG_PRINTF, 0);
6ea70f76 134 kprintf("\n");
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135 error = EIO;
136 goto done;
137 }
138
139 /* Weakly verify it. */
140 cp = bp->b_data;
8a88e0d0 141 sname = dsname(dev, dkunit(dev), WHOLE_DISK_SLICE, WHOLE_SLICE_PART, partname);
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142 if (cp[0x1FE] != 0x55 || cp[0x1FF] != 0xAA) {
143 if (bootverbose)
6ea70f76 144 kprintf("%s: invalid primary partition table: no magic\n",
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145 sname);
146 error = EINVAL;
147 goto done;
148 }
149
150 /* Make a copy of the partition table to avoid alignment problems. */
151 memcpy(&dpcopy[0], cp + DOSPARTOFF, sizeof(dpcopy));
152
153 dp0 = &dpcopy[0];
154
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155 /*
156 * Check for "Ontrack Diskmanager" or GPT. If a GPT is found in
157 * the first dos partition, ignore the rest of the MBR and go
158 * to GPT processing.
159 */
984263bc 160 for (dospart = 0, dp = dp0; dospart < NDOSPART; dospart++, dp++) {
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161 if (dospart == 0 &&
162 (dp->dp_typ == DOSPTYP_PMBR || dp->dp_typ == DOSPTYP_GPT)) {
163 if (bootverbose)
164 kprintf(
165 "%s: Found GPT in slice #%d\n", sname, dospart + 1);
166 error = gptinit(dev, info, sspp);
167 goto done;
168 }
169
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170 if (dp->dp_typ == DOSPTYP_ONTRACK) {
171 if (bootverbose)
6ea70f76 172 kprintf(
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173 "%s: Found \"Ontrack Disk Manager\" on this disk.\n", sname);
174 bp->b_flags |= B_INVAL | B_AGE;
175 brelse(bp);
176 mbr_offset = 63;
177 goto reread_mbr;
178 }
179 }
180
181 if (bcmp(dp0, historical_bogus_partition_table,
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182 sizeof historical_bogus_partition_table) == 0 ||
183 bcmp(dp0, historical_bogus_partition_table_fixed,
184 sizeof historical_bogus_partition_table_fixed) == 0) {
185#if 0
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186 TRACE(("%s: invalid primary partition table: historical\n",
187 sname));
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188#endif /* 0 */
189 if (bootverbose)
6ea70f76 190 kprintf(
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191 "%s: invalid primary partition table: Dangerously Dedicated (ignored)\n",
192 sname);
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193 error = EINVAL;
194 goto done;
195 }
196
197 /* Guess the geometry. */
198 /*
199 * TODO:
200 * Perhaps skip entries with 0 size.
201 * Perhaps only look at entries of type DOSPTYP_386BSD.
202 */
203 max_ncyls = 0;
204 max_nsectors = 0;
205 max_ntracks = 0;
206 for (dospart = 0, dp = dp0; dospart < NDOSPART; dospart++, dp++) {
207 int ncyls;
208 int nsectors;
209 int ntracks;
210
211 ncyls = DPCYL(dp->dp_ecyl, dp->dp_esect) + 1;
212 if (max_ncyls < ncyls)
213 max_ncyls = ncyls;
214 nsectors = DPSECT(dp->dp_esect);
215 if (max_nsectors < nsectors)
216 max_nsectors = nsectors;
217 ntracks = dp->dp_ehd + 1;
218 if (max_ntracks < ntracks)
219 max_ntracks = ntracks;
220 }
221
222 /*
223 * Check that we have guessed the geometry right by checking the
224 * partition entries.
225 */
226 /*
227 * TODO:
228 * As above.
229 * Check for overlaps.
230 * Check against d_secperunit if the latter is reliable.
231 */
232 error = 0;
233 for (dospart = 0, dp = dp0; dospart < NDOSPART; dospart++, dp++) {
234 if (dp->dp_scyl == 0 && dp->dp_shd == 0 && dp->dp_ssect == 0
235 && dp->dp_start == 0 && dp->dp_size == 0)
236 continue;
237 sname = dsname(dev, dkunit(dev), BASE_SLICE + dospart,
8a88e0d0 238 WHOLE_SLICE_PART, partname);
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239
240 /*
241 * Temporarily ignore errors from this check. We could
242 * simplify things by accepting the table eariler if we
243 * always ignore errors here. Perhaps we should always
244 * accept the table if the magic is right but not let
245 * bad entries affect the geometry.
246 */
247 check_part(sname, dp, mbr_offset, max_nsectors, max_ntracks,
248 mbr_offset);
249 }
250 if (error != 0)
251 goto done;
252
253 /*
254 * Accept the DOS partition table.
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255 *
256 * Adjust the disk information structure with updated CHS
257 * conversion parameters, but only use values extracted from
258 * the primary partition table.
259 *
260 * NOTE! Regardless of our having to deal with this old cruft,
261 * we do not screw around with the info->d_media* parameters.
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262 */
263 secpercyl = (u_long)max_nsectors * max_ntracks;
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264 if (secpercyl != 0 && mbr_offset == DOSBBSECTOR) {
265 info->d_secpertrack = max_nsectors;
266 info->d_nheads = max_ntracks;
267 info->d_secpercyl = secpercyl;
268 info->d_ncylinders = info->d_media_blocks / secpercyl;
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269 }
270
271 /*
272 * We are passed a pointer to a suitably initialized minimal
273 * slices "struct" with no dangling pointers in it. Replace it
274 * by a maximal one. This usually oversizes the "struct", but
275 * enlarging it while searching for logical drives would be
276 * inconvenient.
277 */
efda3bd0 278 kfree(*sspp, M_DEVBUF);
84f8b009 279 ssp = dsmakeslicestruct(MAX_SLICES, info);
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280 *sspp = ssp;
281
282 /* Initialize normal slices. */
283 sp = &ssp->dss_slices[BASE_SLICE];
284 for (dospart = 0, dp = dp0; dospart < NDOSPART; dospart++, dp++, sp++) {
285 sname = dsname(dev, dkunit(dev), BASE_SLICE + dospart,
8a88e0d0 286 WHOLE_SLICE_PART, partname);
84f8b009 287 (void)mbr_setslice(sname, info, sp, dp, mbr_offset);
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288 }
289 ssp->dss_nslices = BASE_SLICE + NDOSPART;
290
291 /* Handle extended partitions. */
292 sp -= NDOSPART;
a0c19955 293 for (dospart = 0; dospart < NDOSPART; dospart++, sp++) {
984263bc 294 if (sp->ds_type == DOSPTYP_EXTENDED ||
a0c19955 295 sp->ds_type == DOSPTYP_EXTENDEDX) {
84f8b009 296 mbr_extended(wdev, info, ssp,
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297 sp->ds_offset, sp->ds_size, sp->ds_offset,
298 max_nsectors, max_ntracks, mbr_offset, 1);
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299 }
300 }
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301
302 /*
303 * mbr_extended() abuses ssp->dss_nslices for the number of slices
304 * that would be found if there were no limit on the number of slices
305 * in *ssp. Cut it back now.
306 */
307 if (ssp->dss_nslices > MAX_SLICES)
308 ssp->dss_nslices = MAX_SLICES;
309
310done:
311 bp->b_flags |= B_INVAL | B_AGE;
312 brelse(bp);
313 if (error == EINVAL)
314 error = 0;
315 return (error);
316}
317
84f8b009 318static int
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319check_part(char *sname, struct dos_partition *dp, u_int64_t offset,
320 int nsectors, int ntracks, u_int64_t mbr_offset)
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321{
322 int chs_ecyl;
323 int chs_esect;
324 int chs_scyl;
325 int chs_ssect;
326 int error;
84f8b009 327 u_long secpercyl;
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328 u_int64_t esector;
329 u_int64_t esector1;
330 u_int64_t ssector;
331 u_int64_t ssector1;
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332
333 secpercyl = (u_long)nsectors * ntracks;
334 chs_scyl = DPCYL(dp->dp_scyl, dp->dp_ssect);
335 chs_ssect = DPSECT(dp->dp_ssect);
336 ssector = chs_ssect - 1 + dp->dp_shd * nsectors + chs_scyl * secpercyl
337 + mbr_offset;
338 ssector1 = offset + dp->dp_start;
339
340 /*
341 * If ssector1 is on a cylinder >= 1024, then ssector can't be right.
342 * Allow the C/H/S for it to be 1023/ntracks-1/nsectors, or correct
343 * apart from the cylinder being reduced modulo 1024. Always allow
344 * 1023/255/63, because this is the official way to represent
345 * pure-LBA for the starting position.
346 */
347 if ((ssector < ssector1
348 && ((chs_ssect == nsectors && dp->dp_shd == ntracks - 1
349 && chs_scyl == 1023)
350 || (secpercyl != 0
351 && (ssector1 - ssector) % (1024 * secpercyl) == 0)))
352 || (dp->dp_scyl == 255 && dp->dp_shd == 255
353 && dp->dp_ssect == 255)) {
e0fc5693 354 TRACE(("%s: C/H/S start %d/%d/%d, start %llu: allow\n",
973c11b9
MD
355 sname, chs_scyl, dp->dp_shd, chs_ssect,
356 (long long)ssector1));
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357 ssector = ssector1;
358 }
359
360 chs_ecyl = DPCYL(dp->dp_ecyl, dp->dp_esect);
361 chs_esect = DPSECT(dp->dp_esect);
362 esector = chs_esect - 1 + dp->dp_ehd * nsectors + chs_ecyl * secpercyl
363 + mbr_offset;
364 esector1 = ssector1 + dp->dp_size - 1;
365
366 /*
367 * Allow certain bogus C/H/S values for esector, as above. However,
368 * heads == 255 isn't really legal and causes some BIOS crashes. The
369 * correct value to indicate a pure-LBA end is 1023/heads-1/sectors -
370 * usually 1023/254/63. "heads" is base 0, "sectors" is base 1.
371 */
372 if ((esector < esector1
373 && ((chs_esect == nsectors && dp->dp_ehd == ntracks - 1
374 && chs_ecyl == 1023)
375 || (secpercyl != 0
376 && (esector1 - esector) % (1024 * secpercyl) == 0)))
377 || (dp->dp_ecyl == 255 && dp->dp_ehd == 255
378 && dp->dp_esect == 255)) {
e0fc5693 379 TRACE(("%s: C/H/S end %d/%d/%d, end %llu: allow\n",
973c11b9
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380 sname, chs_ecyl, dp->dp_ehd, chs_esect,
381 (long long)esector1));
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382 esector = esector1;
383 }
384
385 error = (ssector == ssector1 && esector == esector1) ? 0 : EINVAL;
386 if (bootverbose)
e0fc5693 387 kprintf("%s: type 0x%x, start %llu, end = %llu, size %lu %s\n",
973c11b9
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388 sname, dp->dp_typ,
389 (long long)ssector1, (long long)esector1,
390 (u_long)dp->dp_size, (error ? "" : ": OK"));
84f8b009 391 if (ssector != ssector1 && bootverbose)
e0fc5693 392 kprintf("%s: C/H/S start %d/%d/%d (%llu) != start %llu: invalid\n",
84f8b009 393 sname, chs_scyl, dp->dp_shd, chs_ssect,
973c11b9 394 (long long)ssector, (long long)ssector1);
84f8b009 395 if (esector != esector1 && bootverbose)
e0fc5693 396 kprintf("%s: C/H/S end %d/%d/%d (%llu) != end %llu: invalid\n",
84f8b009 397 sname, chs_ecyl, dp->dp_ehd, chs_esect,
973c11b9 398 (long long)esector, (long long)esector1);
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MD
399 return (error);
400}
401
402static
984263bc 403void
84f8b009 404mbr_extended(cdev_t dev, struct disk_info *info, struct diskslices *ssp,
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405 u_int64_t ext_offset, u_int64_t ext_size, u_int64_t base_ext_offset,
406 int nsectors, int ntracks, u_int64_t mbr_offset, int level)
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407{
408 struct buf *bp;
409 u_char *cp;
410 int dospart;
411 struct dos_partition *dp;
412 struct dos_partition dpcopy[NDOSPART];
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413 u_int64_t ext_offsets[NDOSPART];
414 u_int64_t ext_sizes[NDOSPART];
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415 char partname[2];
416 int slice;
417 char *sname;
418 struct diskslice *sp;
419
420 if (level >= 16) {
6ea70f76 421 kprintf(
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422 "%s: excessive recursion in search for slices; aborting search\n",
423 devtoname(dev));
424 return;
425 }
426
427 /* Read extended boot record. */
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428 bp = geteblk((int)info->d_media_blksize);
429 bp->b_bio1.bio_offset = (off_t)ext_offset * info->d_media_blksize;
430 bp->b_bcount = info->d_media_blksize;
10f3fee5 431 bp->b_cmd = BUF_CMD_READ;
81b5c339 432 dev_dstrategy(dev, &bp->b_bio1);
984263bc 433 if (biowait(bp) != 0) {
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434 diskerr(&bp->b_bio1, dev,
435 "reading extended partition table: error",
a688b15c 436 LOG_PRINTF, 0);
6ea70f76 437 kprintf("\n");
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438 goto done;
439 }
440
441 /* Weakly verify it. */
442 cp = bp->b_data;
443 if (cp[0x1FE] != 0x55 || cp[0x1FF] != 0xAA) {
8a88e0d0 444 sname = dsname(dev, dkunit(dev), WHOLE_DISK_SLICE, WHOLE_SLICE_PART,
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445 partname);
446 if (bootverbose)
6ea70f76 447 kprintf("%s: invalid extended partition table: no magic\n",
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448 sname);
449 goto done;
450 }
451
452 /* Make a copy of the partition table to avoid alignment problems. */
453 memcpy(&dpcopy[0], cp + DOSPARTOFF, sizeof(dpcopy));
454
455 slice = ssp->dss_nslices;
456 for (dospart = 0, dp = &dpcopy[0]; dospart < NDOSPART;
457 dospart++, dp++) {
458 ext_sizes[dospart] = 0;
459 if (dp->dp_scyl == 0 && dp->dp_shd == 0 && dp->dp_ssect == 0
460 && dp->dp_start == 0 && dp->dp_size == 0)
461 continue;
462 if (dp->dp_typ == DOSPTYP_EXTENDED ||
463 dp->dp_typ == DOSPTYP_EXTENDEDX) {
464 static char buf[32];
465
466 sname = dsname(dev, dkunit(dev), WHOLE_DISK_SLICE,
8a88e0d0 467 WHOLE_SLICE_PART, partname);
f8c7a42d 468 ksnprintf(buf, sizeof(buf), "%s", sname);
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469 if (strlen(buf) < sizeof buf - 11)
470 strcat(buf, "<extended>");
471 check_part(buf, dp, base_ext_offset, nsectors,
472 ntracks, mbr_offset);
473 ext_offsets[dospart] = base_ext_offset + dp->dp_start;
474 ext_sizes[dospart] = dp->dp_size;
475 } else {
8a88e0d0 476 sname = dsname(dev, dkunit(dev), slice, WHOLE_SLICE_PART,
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477 partname);
478 check_part(sname, dp, ext_offset, nsectors, ntracks,
479 mbr_offset);
480 if (slice >= MAX_SLICES) {
6ea70f76 481 kprintf("%s: too many slices\n", sname);
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482 slice++;
483 continue;
484 }
485 sp = &ssp->dss_slices[slice];
84f8b009 486 if (mbr_setslice(sname, info, sp, dp, ext_offset) != 0)
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487 continue;
488 slice++;
489 }
490 }
491 ssp->dss_nslices = slice;
492
493 /* If we found any more slices, recursively find all the subslices. */
a0c19955
MD
494 for (dospart = 0; dospart < NDOSPART; dospart++) {
495 if (ext_sizes[dospart] != 0) {
84f8b009 496 mbr_extended(dev, info, ssp, ext_offsets[dospart],
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497 ext_sizes[dospart], base_ext_offset,
498 nsectors, ntracks, mbr_offset, ++level);
a0c19955
MD
499 }
500 }
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501
502done:
503 bp->b_flags |= B_INVAL | B_AGE;
504 brelse(bp);
505}
506
507static int
84f8b009 508mbr_setslice(char *sname, struct disk_info *info, struct diskslice *sp,
e0fc5693 509 struct dos_partition *dp, u_int64_t br_offset)
984263bc 510{
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511 u_int64_t offset;
512 u_int64_t size;
984263bc
MD
513
514 offset = br_offset + dp->dp_start;
84f8b009 515 if (offset > info->d_media_blocks || offset < br_offset) {
6ea70f76 516 kprintf(
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517 "%s: slice starts beyond end of the disk: rejecting it\n",
518 sname);
519 return (1);
520 }
84f8b009 521 size = info->d_media_blocks - offset;
34ea800d
MD
522 if (size >= dp->dp_size) {
523 if (dp->dp_size == 0xFFFFFFFFU) {
524 kprintf("%s: slice >2TB, using media size instead "
525 "of slice table size\n", sname);
526 } else {
527 size = dp->dp_size;
528 }
529 } else {
530 kprintf("%s: slice extends beyond end of disk: "
531 "truncating from %lu to %llu sectors\n",
973c11b9 532 sname, (long long)dp->dp_size, size);
34ea800d 533 }
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534 sp->ds_offset = offset;
535 sp->ds_size = size;
536 sp->ds_type = dp->dp_typ;
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537 bzero(&sp->ds_type_uuid, sizeof(sp->ds_type_uuid));
538 bzero(&sp->ds_stor_uuid, sizeof(sp->ds_type_uuid));
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539
540 /*
1c3c151b 541 * Slices do not overlap with the parent (if any).
154b688d 542 */
1c3c151b 543 sp->ds_reserved = 0;
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544 return (0);
545}