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>
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8 * modification, are permitted provided that the following conditions
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14 * notice, this list of conditions and the following disclaimer in
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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
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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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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 l32_freedisklabel(disklabel_t *lpp)
165 kfree((*lpp).lab32, M_DEVBUF);
170 * Attempt to read a disk label from a device.
172 * Returns NULL on sucess, and an error string on failure
175 l32_readdisklabel(cdev_t dev, struct diskslice *sp, disklabel_t *lpp,
176 struct disk_info *info)
180 struct disklabel32 *dlp;
181 const char *msg = NULL;
182 int secsize = info->d_media_blksize;
184 bp = geteblk(secsize);
185 bp->b_bio1.bio_offset = (off_t)LABELSECTOR32 * secsize;
186 bp->b_bio1.bio_done = biodone_sync;
187 bp->b_bio1.bio_flags |= BIO_SYNC;
188 bp->b_bcount = secsize;
189 bp->b_flags &= ~B_INVAL;
190 bp->b_cmd = BUF_CMD_READ;
191 dev_dstrategy(dev, &bp->b_bio1);
192 if (biowait(&bp->b_bio1, "labrd"))
194 else for (dlp = (struct disklabel32 *)bp->b_data;
195 dlp <= (struct disklabel32 *)((char *)bp->b_data +
196 secsize - sizeof(*dlp));
197 dlp = (struct disklabel32 *)((char *)dlp + sizeof(long))) {
198 if (dlp->d_magic != DISKMAGIC32 ||
199 dlp->d_magic2 != DISKMAGIC32) {
201 * NOTE! dsreadandsetlabel() does a strcmp() on
205 msg = "no disk label";
206 } else if (dlp->d_npartitions > MAXPARTITIONS32 ||
207 dkcksum32(dlp) != 0) {
208 msg = "disk label corrupted";
211 msg = l32_fixlabel(NULL, sp, lpx, FALSE);
213 (*lpp).lab32 = kmalloc(sizeof(*dlp),
214 M_DEVBUF, M_WAITOK|M_ZERO);
215 *(*lpp).lab32 = *dlp;
220 bp->b_flags |= B_INVAL | B_AGE;
226 * Check new disk label for sensibility before setting it.
229 l32_setdisklabel(disklabel_t olpx, disklabel_t nlpx, struct diskslices *ssp,
230 struct diskslice *sp, u_int32_t *openmask)
232 struct disklabel32 *olp, *nlp;
233 struct partition32 *opp, *npp;
241 * Check it is actually a disklabel we are looking at.
243 if (nlp->d_magic != DISKMAGIC32 || nlp->d_magic2 != DISKMAGIC32 ||
248 * For each partition that we think is open, check the new disklabel
249 * for compatibility. Ignore special partitions (>= 128).
253 if (openmask[i >> 5] == 0) {
257 if ((openmask[i >> 5] & (1 << (i & 31))) == 0) {
261 if (nlp->d_npartitions <= i)
263 opp = &olp->d_partitions[i];
264 npp = &nlp->d_partitions[i];
265 if (npp->p_offset != opp->p_offset || npp->p_size < opp->p_size)
268 * Copy internally-set partition information
269 * if new label doesn't include it. XXX
270 * (If we are using it then we had better stay the same type)
271 * This is possibly dubious, as someone else noted (XXX)
273 if (npp->p_fstype == FS_UNUSED && opp->p_fstype != FS_UNUSED) {
274 npp->p_fstype = opp->p_fstype;
275 npp->p_fsize = opp->p_fsize;
276 npp->p_frag = opp->p_frag;
277 npp->p_cpg = opp->p_cpg;
282 nlp->d_checksum = dkcksum32(nlp);
285 if (olp->d_partitions[RAW_PART].p_offset)
287 if (olp->d_secperunit > sp->ds_size)
289 for (part = 0; part < olp->d_npartitions; ++part) {
290 if (olp->d_partitions[part].p_size > sp->ds_size)
297 * Write disk label back to device after modification.
300 l32_writedisklabel(cdev_t dev, struct diskslices *ssp, struct diskslice *sp,
303 struct disklabel32 *lp;
304 struct disklabel32 *dlp;
311 if (lp->d_partitions[RAW_PART].p_offset != 0)
312 return (EXDEV); /* not quite right */
314 bp = geteblk((int)lp->d_secsize);
315 bp->b_bio1.bio_offset = (off_t)LABELSECTOR32 * lp->d_secsize;
316 bp->b_bio1.bio_done = biodone_sync;
317 bp->b_bio1.bio_flags |= BIO_SYNC;
318 bp->b_bcount = lp->d_secsize;
322 * We read the label first to see if it's there,
323 * in which case we will put ours at the same offset into the block..
324 * (I think this is stupid [Julian])
325 * Note that you can't write a label out over a corrupted label!
326 * (also stupid.. how do you write the first one? by raw writes?)
328 bp->b_flags &= ~B_INVAL;
329 bp->b_cmd = BUF_CMD_READ;
330 KKASSERT(dkpart(dev) == WHOLE_SLICE_PART);
331 dev_dstrategy(dev, &bp->b_bio1);
332 error = biowait(&bp->b_bio1, "labrd");
335 for (dlp = (struct disklabel32 *)bp->b_data;
336 dlp <= (struct disklabel32 *)
337 ((char *)bp->b_data + lp->d_secsize - sizeof(*dlp));
338 dlp = (struct disklabel32 *)((char *)dlp + sizeof(long))) {
339 if (dlp->d_magic == DISKMAGIC32 &&
340 dlp->d_magic2 == DISKMAGIC32 && dkcksum32(dlp) == 0) {
343 msg = l32_fixlabel(NULL, sp, lpx, TRUE);
347 bp->b_cmd = BUF_CMD_WRITE;
348 bp->b_bio1.bio_done = biodone_sync;
349 bp->b_bio1.bio_flags |= BIO_SYNC;
350 KKASSERT(dkpart(dev) == WHOLE_SLICE_PART);
351 dev_dstrategy(dev, &bp->b_bio1);
352 error = biowait(&bp->b_bio1, "labwr");
360 bzero(bp->b_data, lp->d_secsize);
361 dlp = (struct disklabel32 *)bp->b_data;
363 bp->b_flags &= ~B_INVAL;
364 bp->b_cmd = BUF_CMD_WRITE;
365 bp->b_bio1.bio_done = biodone_sync;
366 bp->b_bio1.bio_flags |= BIO_SYNC;
368 error = biowait(&bp->b_bio1, "labwr");
370 bp->b_flags |= B_INVAL | B_AGE;
376 * Create a disklabel based on a disk_info structure, initializing
377 * the appropriate fields and creating a raw partition that covers the
380 * If a diskslice is passed, the label is truncated to the slice
383 l32_clone_label(struct disk_info *info, struct diskslice *sp)
385 struct disklabel32 *lp;
388 lp = kmalloc(sizeof *lp, M_DEVBUF, M_WAITOK | M_ZERO);
389 lp->d_nsectors = info->d_secpertrack;
390 lp->d_ntracks = info->d_nheads;
391 lp->d_secpercyl = info->d_secpercyl;
392 lp->d_secsize = info->d_media_blksize;
395 lp->d_secperunit = (u_int)sp->ds_size;
397 lp->d_secperunit = (u_int)info->d_media_blocks;
399 if (lp->d_typename[0] == '\0')
400 strncpy(lp->d_typename, "amnesiac", sizeof(lp->d_typename));
401 if (lp->d_packname[0] == '\0')
402 strncpy(lp->d_packname, "fictitious", sizeof(lp->d_packname));
403 if (lp->d_nsectors == 0)
405 if (lp->d_ntracks == 0)
407 lp->d_secpercyl = lp->d_nsectors * lp->d_ntracks;
408 lp->d_ncylinders = lp->d_secperunit / lp->d_secpercyl;
411 if (lp->d_interleave == 0)
412 lp->d_interleave = 1;
413 if (lp->d_npartitions < RAW_PART + 1)
414 lp->d_npartitions = MAXPARTITIONS32;
415 if (lp->d_bbsize == 0)
416 lp->d_bbsize = BBSIZE;
417 if (lp->d_sbsize == 0)
418 lp->d_sbsize = SBSIZE;
421 * Used by various devices to create a compatibility slice which
422 * allows us to mount root from devices which do not have a
423 * disklabel. Particularly: CDs.
425 lp->d_partitions[RAW_PART].p_size = lp->d_secperunit;
426 if (info->d_dsflags & DSO_COMPATPARTA) {
427 lp->d_partitions[0].p_size = lp->d_secperunit;
428 lp->d_partitions[0].p_fstype = FS_OTHER;
430 lp->d_magic = DISKMAGIC32;
431 lp->d_magic2 = DISKMAGIC32;
432 lp->d_checksum = dkcksum32(lp);
438 l32_makevirginlabel(disklabel_t lpx, struct diskslices *ssp,
439 struct diskslice *sp, struct disk_info *info)
441 struct disklabel32 *lp = lpx.lab32;
442 struct partition32 *pp;
443 disklabel_t template;
445 template = l32_clone_label(info, NULL);
446 bcopy(template.opaque, lp, sizeof(struct disklabel32));
448 lp->d_magic = DISKMAGIC32;
449 lp->d_magic2 = DISKMAGIC32;
451 lp->d_npartitions = MAXPARTITIONS32;
452 if (lp->d_interleave == 0)
453 lp->d_interleave = 1;
456 if (lp->d_nsectors == 0) /* sectors per track */
458 if (lp->d_ntracks == 0) /* heads */
460 lp->d_ncylinders = 0;
461 lp->d_bbsize = BBSIZE;
462 lp->d_sbsize = SBSIZE;
465 * If the slice or GPT partition is really small we could
466 * wind up with an absurd calculation for ncylinders.
468 while (lp->d_ncylinders < 4) {
469 if (lp->d_ntracks > 1)
471 else if (lp->d_nsectors > 1)
472 lp->d_nsectors >>= 1;
475 lp->d_secpercyl = lp->d_nsectors * lp->d_ntracks;
476 lp->d_ncylinders = sp->ds_size / lp->d_secpercyl;
480 * Set or Modify the partition sizes to accomodate the slice,
481 * since we started with a copy of the virgin label stored
482 * in the whole-disk-slice and we are probably not a
485 lp->d_secperunit = sp->ds_size;
486 pp = &lp->d_partitions[RAW_PART];
488 pp->p_size = lp->d_secperunit;
489 if (info->d_dsflags & DSO_COMPATPARTA) {
490 pp = &lp->d_partitions[0];
492 pp->p_size = lp->d_secperunit;
493 pp->p_fstype = FS_OTHER;
496 lp->d_checksum = dkcksum32(lp);
498 kfree(template.opaque, M_DEVBUF);
502 l32_fixlabel(const char *sname, struct diskslice *sp,
503 disklabel_t lpx, int writeflag)
505 struct disklabel32 *lp;
506 struct partition32 *pp;
515 /* These errors "can't happen" so don't bother reporting details. */
516 if (lp->d_magic != DISKMAGIC32 || lp->d_magic2 != DISKMAGIC32)
517 return ("fixlabel: invalid magic");
518 if (dkcksum32(lp) != 0)
519 return ("fixlabel: invalid checksum");
521 pp = &lp->d_partitions[RAW_PART];
524 * What a mess. For ages old backwards compatibility the disklabel
525 * on-disk stores absolute offsets instead of slice-relative offsets.
526 * So fix it up when reading, writing, or snooping.
528 * The in-core label is always slice-relative.
532 offset = sp->ds_offset;
534 start = sp->ds_offset;
535 offset = -sp->ds_offset;
537 if (pp->p_offset != start) {
540 "%s: rejecting BSD label: raw partition offset != slice offset\n",
542 slice_info(sname, sp);
543 partition_info(sname, RAW_PART, pp);
545 return ("fixlabel: raw partition offset != slice offset");
547 if (pp->p_size != sp->ds_size) {
549 kprintf("%s: raw partition size != slice size\n", sname);
550 slice_info(sname, sp);
551 partition_info(sname, RAW_PART, pp);
553 if (pp->p_size > sp->ds_size) {
555 return ("fixlabel: raw partition size > slice size");
556 kprintf("%s: truncating raw partition\n", sname);
557 pp->p_size = sp->ds_size;
560 end = start + sp->ds_size;
562 return ("fixlabel: slice wraps");
563 if (lp->d_secpercyl <= 0)
564 return ("fixlabel: d_secpercyl <= 0");
567 for (part = 0; part < lp->d_npartitions; part++, pp++) {
568 if (pp->p_offset != 0 || pp->p_size != 0) {
569 if (pp->p_offset < start
570 || pp->p_offset + pp->p_size > end
571 || pp->p_offset + pp->p_size < pp->p_offset) {
574 "%s: rejecting partition in BSD label: it isn't entirely within the slice\n",
577 slice_info(sname, sp);
580 partition_info(sname, part, pp);
582 /* XXX else silently discard junk. */
583 bzero(pp, sizeof *pp);
585 pp->p_offset += offset;
589 lp->d_ncylinders = sp->ds_size / lp->d_secpercyl;
590 lp->d_secperunit = sp->ds_size;
592 lp->d_checksum = dkcksum32(lp);
597 * Set the number of blocks at the beginning of the slice which have
598 * been reserved for label operations. This area will be write-protected
599 * when accessed via the slice.
602 l32_adjust_label_reserved(struct diskslices *ssp, int slice,
603 struct diskslice *sp)
605 /*struct disklabel32 *lp = sp->ds_label.lab32;*/
606 sp->ds_reserved = SBSIZE / ssp->dss_secsize;
610 partition_info(const char *sname, int part, struct partition32 *pp)
612 kprintf("%s%c: start %lu, end %lu, size %lu\n", sname, 'a' + part,
613 (u_long)pp->p_offset, (u_long)(pp->p_offset + pp->p_size - 1),
618 slice_info(const char *sname, struct diskslice *sp)
620 kprintf("%s: start %llu, end %llu, size %llu\n", sname,
621 (long long)sp->ds_offset,
622 (long long)sp->ds_offset + sp->ds_size - 1,
623 (long long)sp->ds_size);
626 struct disklabel_ops disklabel32_ops = {
627 .labelsize = sizeof(struct disklabel32),
628 .op_readdisklabel = l32_readdisklabel,
629 .op_setdisklabel = l32_setdisklabel,
630 .op_writedisklabel = l32_writedisklabel,
631 .op_clone_label = l32_clone_label,
632 .op_adjust_label_reserved = l32_adjust_label_reserved,
633 .op_getpartbounds = l32_getpartbounds,
634 .op_loadpartinfo = l32_loadpartinfo,
635 .op_getnumparts = l32_getnumparts,
636 .op_makevirginlabel = l32_makevirginlabel,
637 .op_freedisklabel = l32_freedisklabel