2 * Copyright (c) 2003-2007 The DragonFly Project. All rights reserved.
4 * This code is derived from software contributed to The DragonFly Project
5 * by Matthew Dillon <dillon@backplane.com>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
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14 * notice, this list of conditions and the following disclaimer in
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18 * contributors may be used to endorse or promote products derived
19 * from this software without specific, prior written permission.
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31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * ----------------------------------------------------------------------------
35 * "THE BEER-WARE LICENSE" (Revision 42):
36 * <phk@FreeBSD.ORG> wrote this file. As long as you retain this notice you
37 * can do whatever you want with this stuff. If we meet some day, and you think
38 * this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp
39 * ----------------------------------------------------------------------------
41 * Copyright (c) 1982, 1986, 1988, 1993
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43 * (c) UNIX System Laboratories, Inc.
44 * All or some portions of this file are derived from material licensed
45 * to the University of California by American Telephone and Telegraph
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49 * Copyright (c) 1994 Bruce D. Evans.
50 * All rights reserved.
52 * Copyright (c) 1990 The Regents of the University of California.
53 * All rights reserved.
55 * This code is derived from software contributed to Berkeley by
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62 * modification, are permitted provided that the following conditions
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65 * notice, this list of conditions and the following disclaimer.
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71 * This product includes software developed by the University of
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74 * may be used to endorse or promote products derived from this software
75 * without specific prior written permission.
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78 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
79 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
80 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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82 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
83 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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85 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
86 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
89 * @(#)ufs_disksubr.c 8.5 (Berkeley) 1/21/94
90 * $FreeBSD: src/sys/kern/subr_disk.c,v 1.20.2.6 2001/10/05 07:14:57 peter Exp $
91 * $FreeBSD: src/sys/ufs/ufs/ufs_disksubr.c,v 1.44.2.3 2001/03/05 05:42:19 obrien Exp $
94 #include <sys/param.h>
95 #include <sys/systm.h>
96 #include <sys/kernel.h>
98 #include <sys/sysctl.h>
100 #include <sys/conf.h>
101 #include <sys/disklabel.h>
102 #include <sys/disklabel32.h>
103 #include <sys/diskslice.h>
104 #include <sys/disk.h>
105 #include <sys/dtype.h> /* DTYPE_* constants */
106 #include <machine/md_var.h>
107 #include <sys/ctype.h>
108 #include <sys/syslog.h>
109 #include <sys/device.h>
110 #include <sys/msgport.h>
111 #include <sys/msgport2.h>
112 #include <sys/buf2.h>
114 #include <vfs/ufs/dinode.h> /* XXX used only for fs.h */
115 #include <vfs/ufs/fs.h> /* XXX used only to get BBSIZE/SBSIZE */
117 static void partition_info(const char *sname, int part, struct partition32 *pp);
118 static void slice_info(const char *sname, struct diskslice *sp);
119 static const char *l32_fixlabel(const char *sname, struct diskslice *sp,
120 disklabel_t lpx, int writeflag);
123 * Retrieve the partition start and extent, in blocks. Return 0 on success,
127 l32_getpartbounds(struct diskslices *ssp, disklabel_t lp, u_int32_t part,
128 u_int64_t *start, u_int64_t *blocks)
130 struct partition32 *pp;
132 if (part >= lp.lab32->d_npartitions)
134 pp = &lp.lab32->d_partitions[part];
135 *start = pp->p_offset;
136 *blocks = pp->p_size;
141 l32_loadpartinfo(disklabel_t lp, u_int32_t part, struct partinfo *dpart)
143 struct partition32 *pp;
144 const size_t uuid_size = sizeof(struct uuid);
146 bzero(&dpart->fstype_uuid, uuid_size);
147 bzero(&dpart->storage_uuid, uuid_size);
148 if (part < lp.lab32->d_npartitions) {
149 pp = &lp.lab32->d_partitions[part];
150 dpart->fstype = pp->p_fstype;
157 l32_getnumparts(disklabel_t lp)
159 return(lp.lab32->d_npartitions);
163 * Attempt to read a disk label from a device.
165 * Returns NULL on sucess, and an error string on failure
168 l32_readdisklabel(cdev_t dev, struct diskslice *sp, disklabel_t *lpp,
169 struct disk_info *info)
173 struct disklabel32 *dlp;
174 const char *msg = NULL;
175 int secsize = info->d_media_blksize;
177 bp = geteblk(secsize);
178 bp->b_bio1.bio_offset = (off_t)LABELSECTOR32 * secsize;
179 bp->b_bio1.bio_done = biodone_sync;
180 bp->b_bio1.bio_flags |= BIO_SYNC;
181 bp->b_bcount = secsize;
182 bp->b_flags &= ~B_INVAL;
183 bp->b_cmd = BUF_CMD_READ;
184 dev_dstrategy(dev, &bp->b_bio1);
185 if (biowait(&bp->b_bio1, "labrd"))
187 else for (dlp = (struct disklabel32 *)bp->b_data;
188 dlp <= (struct disklabel32 *)((char *)bp->b_data +
189 secsize - sizeof(*dlp));
190 dlp = (struct disklabel32 *)((char *)dlp + sizeof(long))) {
191 if (dlp->d_magic != DISKMAGIC32 ||
192 dlp->d_magic2 != DISKMAGIC32) {
194 * NOTE! dsreadandsetlabel() does a strcmp() on
198 msg = "no disk label";
199 } else if (dlp->d_npartitions > MAXPARTITIONS32 ||
200 dkcksum32(dlp) != 0) {
201 msg = "disk label corrupted";
204 msg = l32_fixlabel(NULL, sp, lpx, FALSE);
206 (*lpp).lab32 = kmalloc(sizeof(*dlp),
207 M_DEVBUF, M_WAITOK|M_ZERO);
208 *(*lpp).lab32 = *dlp;
213 bp->b_flags |= B_INVAL | B_AGE;
219 * Check new disk label for sensibility before setting it.
222 l32_setdisklabel(disklabel_t olpx, disklabel_t nlpx, struct diskslices *ssp,
223 struct diskslice *sp, u_int32_t *openmask)
225 struct disklabel32 *olp, *nlp;
226 struct partition32 *opp, *npp;
234 * Check it is actually a disklabel we are looking at.
236 if (nlp->d_magic != DISKMAGIC32 || nlp->d_magic2 != DISKMAGIC32 ||
241 * For each partition that we think is open, check the new disklabel
242 * for compatibility. Ignore special partitions (>= 128).
246 if (openmask[i >> 5] == 0) {
250 if ((openmask[i >> 5] & (1 << (i & 31))) == 0) {
254 if (nlp->d_npartitions <= i)
256 opp = &olp->d_partitions[i];
257 npp = &nlp->d_partitions[i];
258 if (npp->p_offset != opp->p_offset || npp->p_size < opp->p_size)
261 * Copy internally-set partition information
262 * if new label doesn't include it. XXX
263 * (If we are using it then we had better stay the same type)
264 * This is possibly dubious, as someone else noted (XXX)
266 if (npp->p_fstype == FS_UNUSED && opp->p_fstype != FS_UNUSED) {
267 npp->p_fstype = opp->p_fstype;
268 npp->p_fsize = opp->p_fsize;
269 npp->p_frag = opp->p_frag;
270 npp->p_cpg = opp->p_cpg;
275 nlp->d_checksum = dkcksum32(nlp);
278 if (olp->d_partitions[RAW_PART].p_offset)
280 if (olp->d_secperunit > sp->ds_size)
282 for (part = 0; part < olp->d_npartitions; ++part) {
283 if (olp->d_partitions[part].p_size > sp->ds_size)
290 * Write disk label back to device after modification.
293 l32_writedisklabel(cdev_t dev, struct diskslices *ssp, struct diskslice *sp,
296 struct disklabel32 *lp;
297 struct disklabel32 *dlp;
304 if (lp->d_partitions[RAW_PART].p_offset != 0)
305 return (EXDEV); /* not quite right */
307 bp = geteblk((int)lp->d_secsize);
308 bp->b_bio1.bio_offset = (off_t)LABELSECTOR32 * lp->d_secsize;
309 bp->b_bio1.bio_done = biodone_sync;
310 bp->b_bio1.bio_flags |= BIO_SYNC;
311 bp->b_bcount = lp->d_secsize;
315 * We read the label first to see if it's there,
316 * in which case we will put ours at the same offset into the block..
317 * (I think this is stupid [Julian])
318 * Note that you can't write a label out over a corrupted label!
319 * (also stupid.. how do you write the first one? by raw writes?)
321 bp->b_flags &= ~B_INVAL;
322 bp->b_cmd = BUF_CMD_READ;
323 KKASSERT(dkpart(dev) == WHOLE_SLICE_PART);
324 dev_dstrategy(dev, &bp->b_bio1);
325 error = biowait(&bp->b_bio1, "labrd");
328 for (dlp = (struct disklabel32 *)bp->b_data;
329 dlp <= (struct disklabel32 *)
330 ((char *)bp->b_data + lp->d_secsize - sizeof(*dlp));
331 dlp = (struct disklabel32 *)((char *)dlp + sizeof(long))) {
332 if (dlp->d_magic == DISKMAGIC32 &&
333 dlp->d_magic2 == DISKMAGIC32 && dkcksum32(dlp) == 0) {
336 msg = l32_fixlabel(NULL, sp, lpx, TRUE);
340 bp->b_cmd = BUF_CMD_WRITE;
341 bp->b_bio1.bio_done = biodone_sync;
342 bp->b_bio1.bio_flags |= BIO_SYNC;
343 KKASSERT(dkpart(dev) == WHOLE_SLICE_PART);
344 dev_dstrategy(dev, &bp->b_bio1);
345 error = biowait(&bp->b_bio1, "labwr");
353 bzero(bp->b_data, lp->d_secsize);
354 dlp = (struct disklabel32 *)bp->b_data;
356 bp->b_flags &= ~B_INVAL;
357 bp->b_cmd = BUF_CMD_WRITE;
358 bp->b_bio1.bio_done = biodone_sync;
359 bp->b_bio1.bio_flags |= BIO_SYNC;
361 error = biowait(&bp->b_bio1, "labwr");
363 bp->b_flags |= B_INVAL | B_AGE;
369 * Create a disklabel based on a disk_info structure, initializing
370 * the appropriate fields and creating a raw partition that covers the
373 * If a diskslice is passed, the label is truncated to the slice
376 l32_clone_label(struct disk_info *info, struct diskslice *sp)
378 struct disklabel32 *lp;
381 lp = kmalloc(sizeof *lp, M_DEVBUF, M_WAITOK | M_ZERO);
382 lp->d_nsectors = info->d_secpertrack;
383 lp->d_ntracks = info->d_nheads;
384 lp->d_secpercyl = info->d_secpercyl;
385 lp->d_secsize = info->d_media_blksize;
388 lp->d_secperunit = (u_int)sp->ds_size;
390 lp->d_secperunit = (u_int)info->d_media_blocks;
392 if (lp->d_typename[0] == '\0')
393 strncpy(lp->d_typename, "amnesiac", sizeof(lp->d_typename));
394 if (lp->d_packname[0] == '\0')
395 strncpy(lp->d_packname, "fictitious", sizeof(lp->d_packname));
396 if (lp->d_nsectors == 0)
398 if (lp->d_ntracks == 0)
400 lp->d_secpercyl = lp->d_nsectors * lp->d_ntracks;
401 lp->d_ncylinders = lp->d_secperunit / lp->d_secpercyl;
404 if (lp->d_interleave == 0)
405 lp->d_interleave = 1;
406 if (lp->d_npartitions < RAW_PART + 1)
407 lp->d_npartitions = MAXPARTITIONS32;
408 if (lp->d_bbsize == 0)
409 lp->d_bbsize = BBSIZE;
410 if (lp->d_sbsize == 0)
411 lp->d_sbsize = SBSIZE;
414 * Used by various devices to create a compatibility slice which
415 * allows us to mount root from devices which do not have a
416 * disklabel. Particularly: CDs.
418 lp->d_partitions[RAW_PART].p_size = lp->d_secperunit;
419 if (info->d_dsflags & DSO_COMPATPARTA) {
420 lp->d_partitions[0].p_size = lp->d_secperunit;
421 lp->d_partitions[0].p_fstype = FS_OTHER;
423 lp->d_magic = DISKMAGIC32;
424 lp->d_magic2 = DISKMAGIC32;
425 lp->d_checksum = dkcksum32(lp);
431 l32_makevirginlabel(disklabel_t lpx, struct diskslices *ssp,
432 struct diskslice *sp, struct disk_info *info)
434 struct disklabel32 *lp = lpx.lab32;
435 struct partition32 *pp;
436 disklabel_t template;
438 template = l32_clone_label(info, NULL);
439 bcopy(template.opaque, lp, sizeof(struct disklabel32));
441 lp->d_magic = DISKMAGIC32;
442 lp->d_magic2 = DISKMAGIC32;
444 lp->d_npartitions = MAXPARTITIONS32;
445 if (lp->d_interleave == 0)
446 lp->d_interleave = 1;
449 if (lp->d_nsectors == 0) /* sectors per track */
451 if (lp->d_ntracks == 0) /* heads */
453 lp->d_ncylinders = 0;
454 lp->d_bbsize = BBSIZE;
455 lp->d_sbsize = SBSIZE;
458 * If the slice or GPT partition is really small we could
459 * wind up with an absurd calculation for ncylinders.
461 while (lp->d_ncylinders < 4) {
462 if (lp->d_ntracks > 1)
464 else if (lp->d_nsectors > 1)
465 lp->d_nsectors >>= 1;
468 lp->d_secpercyl = lp->d_nsectors * lp->d_ntracks;
469 lp->d_ncylinders = sp->ds_size / lp->d_secpercyl;
473 * Set or Modify the partition sizes to accomodate the slice,
474 * since we started with a copy of the virgin label stored
475 * in the whole-disk-slice and we are probably not a
478 lp->d_secperunit = sp->ds_size;
479 pp = &lp->d_partitions[RAW_PART];
481 pp->p_size = lp->d_secperunit;
482 if (info->d_dsflags & DSO_COMPATPARTA) {
483 pp = &lp->d_partitions[0];
485 pp->p_size = lp->d_secperunit;
486 pp->p_fstype = FS_OTHER;
489 lp->d_checksum = dkcksum32(lp);
491 kfree(template.opaque, M_DEVBUF);
495 l32_fixlabel(const char *sname, struct diskslice *sp,
496 disklabel_t lpx, int writeflag)
498 struct disklabel32 *lp;
499 struct partition32 *pp;
508 /* These errors "can't happen" so don't bother reporting details. */
509 if (lp->d_magic != DISKMAGIC32 || lp->d_magic2 != DISKMAGIC32)
510 return ("fixlabel: invalid magic");
511 if (dkcksum32(lp) != 0)
512 return ("fixlabel: invalid checksum");
514 pp = &lp->d_partitions[RAW_PART];
517 * What a mess. For ages old backwards compatibility the disklabel
518 * on-disk stores absolute offsets instead of slice-relative offsets.
519 * So fix it up when reading, writing, or snooping.
521 * The in-core label is always slice-relative.
525 offset = sp->ds_offset;
527 start = sp->ds_offset;
528 offset = -sp->ds_offset;
530 if (pp->p_offset != start) {
533 "%s: rejecting BSD label: raw partition offset != slice offset\n",
535 slice_info(sname, sp);
536 partition_info(sname, RAW_PART, pp);
538 return ("fixlabel: raw partition offset != slice offset");
540 if (pp->p_size != sp->ds_size) {
542 kprintf("%s: raw partition size != slice size\n", sname);
543 slice_info(sname, sp);
544 partition_info(sname, RAW_PART, pp);
546 if (pp->p_size > sp->ds_size) {
548 return ("fixlabel: raw partition size > slice size");
549 kprintf("%s: truncating raw partition\n", sname);
550 pp->p_size = sp->ds_size;
553 end = start + sp->ds_size;
555 return ("fixlabel: slice wraps");
556 if (lp->d_secpercyl <= 0)
557 return ("fixlabel: d_secpercyl <= 0");
560 for (part = 0; part < lp->d_npartitions; part++, pp++) {
561 if (pp->p_offset != 0 || pp->p_size != 0) {
562 if (pp->p_offset < start
563 || pp->p_offset + pp->p_size > end
564 || pp->p_offset + pp->p_size < pp->p_offset) {
567 "%s: rejecting partition in BSD label: it isn't entirely within the slice\n",
570 slice_info(sname, sp);
573 partition_info(sname, part, pp);
575 /* XXX else silently discard junk. */
576 bzero(pp, sizeof *pp);
578 pp->p_offset += offset;
582 lp->d_ncylinders = sp->ds_size / lp->d_secpercyl;
583 lp->d_secperunit = sp->ds_size;
585 lp->d_checksum = dkcksum32(lp);
590 * Set the number of blocks at the beginning of the slice which have
591 * been reserved for label operations. This area will be write-protected
592 * when accessed via the slice.
595 l32_adjust_label_reserved(struct diskslices *ssp, int slice,
596 struct diskslice *sp)
598 /*struct disklabel32 *lp = sp->ds_label.lab32;*/
599 sp->ds_reserved = SBSIZE / ssp->dss_secsize;
603 partition_info(const char *sname, int part, struct partition32 *pp)
605 kprintf("%s%c: start %lu, end %lu, size %lu\n", sname, 'a' + part,
606 (u_long)pp->p_offset, (u_long)(pp->p_offset + pp->p_size - 1),
611 slice_info(const char *sname, struct diskslice *sp)
613 kprintf("%s: start %llu, end %llu, size %llu\n", sname,
614 (long long)sp->ds_offset,
615 (long long)sp->ds_offset + sp->ds_size - 1,
616 (long long)sp->ds_size);
619 struct disklabel_ops disklabel32_ops = {
620 .labelsize = sizeof(struct disklabel32),
621 .op_readdisklabel = l32_readdisklabel,
622 .op_setdisklabel = l32_setdisklabel,
623 .op_writedisklabel = l32_writedisklabel,
624 .op_clone_label = l32_clone_label,
625 .op_adjust_label_reserved = l32_adjust_label_reserved,
626 .op_getpartbounds = l32_getpartbounds,
627 .op_loadpartinfo = l32_loadpartinfo,
628 .op_getnumparts = l32_getnumparts,
629 .op_makevirginlabel = l32_makevirginlabel