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
12 * notice, this list of conditions and the following disclaimer.
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14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
17 * 3. Neither the name of The DragonFly Project nor the names of its
18 * contributors may be used to endorse or promote products derived
19 * from this software without specific, prior written permission.
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24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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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47 * the permission of UNIX System Laboratories, Inc.
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
58 * Copyright (c) 1982, 1986, 1988 Regents of the University of California.
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62 * modification, are permitted provided that the following conditions
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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.
77 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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
81 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
82 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
83 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
84 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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 $
92 * $DragonFly: src/sys/kern/subr_disklabel32.c,v 1.4 2007/06/19 06:07:57 dillon Exp $
95 #include <sys/param.h>
96 #include <sys/systm.h>
97 #include <sys/kernel.h>
99 #include <sys/sysctl.h>
101 #include <sys/conf.h>
102 #include <sys/disklabel.h>
103 #include <sys/disklabel32.h>
104 #include <sys/diskslice.h>
105 #include <sys/disk.h>
106 #include <sys/dtype.h> /* DTYPE_* constants */
107 #include <sys/sysctl.h>
108 #include <machine/md_var.h>
109 #include <sys/ctype.h>
110 #include <sys/syslog.h>
111 #include <sys/device.h>
112 #include <sys/msgport.h>
113 #include <sys/msgport2.h>
114 #include <sys/buf2.h>
116 #include <vfs/ufs/dinode.h> /* XXX used only for fs.h */
117 #include <vfs/ufs/fs.h> /* XXX used only to get BBSIZE/SBSIZE */
119 static void partition_info(const char *sname, int part, struct partition32 *pp);
120 static void slice_info(const char *sname, struct diskslice *sp);
121 static const char *l32_fixlabel(const char *sname, struct diskslice *sp,
122 disklabel_t lpx, int writeflag);
125 * Retrieve the partition start and extent, in blocks. Return 0 on success,
129 l32_getpartbounds(struct diskslices *ssp, disklabel_t lp, u_int32_t part,
130 u_int64_t *start, u_int64_t *blocks)
132 struct partition32 *pp;
134 if (part >= lp.lab32->d_npartitions)
136 pp = &lp.lab32->d_partitions[part];
137 *start = pp->p_offset;
138 *blocks = pp->p_size;
143 l32_loadpartinfo(disklabel_t lp, u_int32_t part, struct partinfo *dpart)
145 struct partition32 *pp;
146 const size_t uuid_size = sizeof(struct uuid);
148 bzero(&dpart->fstype_uuid, uuid_size);
149 bzero(&dpart->storage_uuid, uuid_size);
150 if (part < lp.lab32->d_npartitions) {
151 pp = &lp.lab32->d_partitions[part];
152 dpart->fstype = pp->p_fstype;
159 l32_getnumparts(disklabel_t lp)
161 return(lp.lab32->d_npartitions);
165 * Attempt to read a disk label from a device.
167 * Returns NULL on sucess, and an error string on failure
170 l32_readdisklabel(cdev_t dev, struct diskslice *sp, disklabel_t *lpp,
171 struct disk_info *info)
175 struct disklabel32 *dlp;
176 const char *msg = NULL;
177 int secsize = info->d_media_blksize;
179 bp = geteblk(secsize);
180 bp->b_bio1.bio_offset = (off_t)LABELSECTOR32 * secsize;
181 bp->b_bio1.bio_done = biodone_sync;
182 bp->b_bio1.bio_flags |= BIO_SYNC;
183 bp->b_bcount = secsize;
184 bp->b_flags &= ~B_INVAL;
185 bp->b_cmd = BUF_CMD_READ;
186 dev_dstrategy(dev, &bp->b_bio1);
187 if (biowait(&bp->b_bio1, "labrd"))
189 else for (dlp = (struct disklabel32 *)bp->b_data;
190 dlp <= (struct disklabel32 *)((char *)bp->b_data +
191 secsize - sizeof(*dlp));
192 dlp = (struct disklabel32 *)((char *)dlp + sizeof(long))) {
193 if (dlp->d_magic != DISKMAGIC32 ||
194 dlp->d_magic2 != DISKMAGIC32) {
196 * NOTE! dsreadandsetlabel() does a strcmp() on
200 msg = "no disk label";
201 } else if (dlp->d_npartitions > MAXPARTITIONS32 ||
202 dkcksum32(dlp) != 0) {
203 msg = "disk label corrupted";
206 msg = l32_fixlabel(NULL, sp, lpx, FALSE);
208 (*lpp).lab32 = kmalloc(sizeof(*dlp),
209 M_DEVBUF, M_WAITOK|M_ZERO);
210 *(*lpp).lab32 = *dlp;
215 bp->b_flags |= B_INVAL | B_AGE;
221 * Check new disk label for sensibility before setting it.
224 l32_setdisklabel(disklabel_t olpx, disklabel_t nlpx, struct diskslices *ssp,
225 struct diskslice *sp, u_int32_t *openmask)
227 struct disklabel32 *olp, *nlp;
228 struct partition32 *opp, *npp;
236 * Check it is actually a disklabel we are looking at.
238 if (nlp->d_magic != DISKMAGIC32 || nlp->d_magic2 != DISKMAGIC32 ||
243 * For each partition that we think is open, check the new disklabel
244 * for compatibility. Ignore special partitions (>= 128).
248 if (openmask[i >> 5] == 0) {
252 if ((openmask[i >> 5] & (1 << (i & 31))) == 0) {
256 if (nlp->d_npartitions <= i)
258 opp = &olp->d_partitions[i];
259 npp = &nlp->d_partitions[i];
260 if (npp->p_offset != opp->p_offset || npp->p_size < opp->p_size)
263 * Copy internally-set partition information
264 * if new label doesn't include it. XXX
265 * (If we are using it then we had better stay the same type)
266 * This is possibly dubious, as someone else noted (XXX)
268 if (npp->p_fstype == FS_UNUSED && opp->p_fstype != FS_UNUSED) {
269 npp->p_fstype = opp->p_fstype;
270 npp->p_fsize = opp->p_fsize;
271 npp->p_frag = opp->p_frag;
272 npp->p_cpg = opp->p_cpg;
277 nlp->d_checksum = dkcksum32(nlp);
280 if (olp->d_partitions[RAW_PART].p_offset)
282 if (olp->d_secperunit > sp->ds_size)
284 for (part = 0; part < olp->d_npartitions; ++part) {
285 if (olp->d_partitions[part].p_size > sp->ds_size)
292 * Write disk label back to device after modification.
295 l32_writedisklabel(cdev_t dev, struct diskslices *ssp, struct diskslice *sp,
298 struct disklabel32 *lp;
299 struct disklabel32 *dlp;
306 if (lp->d_partitions[RAW_PART].p_offset != 0)
307 return (EXDEV); /* not quite right */
308 bp = geteblk((int)lp->d_secsize);
309 bp->b_bio1.bio_offset = (off_t)LABELSECTOR32 * lp->d_secsize;
310 bp->b_bio1.bio_done = biodone_sync;
311 bp->b_bio1.bio_flags |= BIO_SYNC;
312 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 dev_dstrategy(dkmodpart(dev, WHOLE_SLICE_PART), &bp->b_bio1);
324 error = biowait(&bp->b_bio1, "labrd");
327 for (dlp = (struct disklabel32 *)bp->b_data;
328 dlp <= (struct disklabel32 *)
329 ((char *)bp->b_data + lp->d_secsize - sizeof(*dlp));
330 dlp = (struct disklabel32 *)((char *)dlp + sizeof(long))) {
331 if (dlp->d_magic == DISKMAGIC32 &&
332 dlp->d_magic2 == DISKMAGIC32 && dkcksum32(dlp) == 0) {
335 msg = l32_fixlabel(NULL, sp, lpx, TRUE);
339 bp->b_cmd = BUF_CMD_WRITE;
340 bp->b_bio1.bio_done = biodone_sync;
341 bp->b_bio1.bio_flags |= BIO_SYNC;
342 dev_dstrategy(dkmodpart(dev, WHOLE_SLICE_PART),
344 error = biowait(&bp->b_bio1, "labwr");
352 bzero(bp->b_data, lp->d_secsize);
353 dlp = (struct disklabel32 *)bp->b_data;
355 bp->b_flags &= ~B_INVAL;
356 bp->b_cmd = BUF_CMD_WRITE;
357 bp->b_bio1.bio_done = biodone_sync;
358 bp->b_bio1.bio_flags |= BIO_SYNC;
360 error = biowait(&bp->b_bio1, "labwr");
362 bp->b_flags |= B_INVAL | B_AGE;
368 * Create a disklabel based on a disk_info structure, initializing
369 * the appropriate fields and creating a raw partition that covers the
372 * If a diskslice is passed, the label is truncated to the slice
375 l32_clone_label(struct disk_info *info, struct diskslice *sp)
377 struct disklabel32 *lp;
380 lp = kmalloc(sizeof *lp, M_DEVBUF, M_WAITOK | M_ZERO);
381 lp->d_nsectors = info->d_secpertrack;
382 lp->d_ntracks = info->d_nheads;
383 lp->d_secpercyl = info->d_secpercyl;
384 lp->d_secsize = info->d_media_blksize;
387 lp->d_secperunit = (u_int)sp->ds_size;
389 lp->d_secperunit = (u_int)info->d_media_blocks;
391 if (lp->d_typename[0] == '\0')
392 strncpy(lp->d_typename, "amnesiac", sizeof(lp->d_typename));
393 if (lp->d_packname[0] == '\0')
394 strncpy(lp->d_packname, "fictitious", sizeof(lp->d_packname));
395 if (lp->d_nsectors == 0)
397 if (lp->d_ntracks == 0)
399 lp->d_secpercyl = lp->d_nsectors * lp->d_ntracks;
400 lp->d_ncylinders = lp->d_secperunit / lp->d_secpercyl;
403 if (lp->d_interleave == 0)
404 lp->d_interleave = 1;
405 if (lp->d_npartitions < RAW_PART + 1)
406 lp->d_npartitions = MAXPARTITIONS32;
407 if (lp->d_bbsize == 0)
408 lp->d_bbsize = BBSIZE;
409 if (lp->d_sbsize == 0)
410 lp->d_sbsize = SBSIZE;
413 * Used by various devices to create a compatibility slice which
414 * allows us to mount root from devices which do not have a
415 * disklabel. Particularly: CDs.
417 lp->d_partitions[RAW_PART].p_size = lp->d_secperunit;
418 if (info->d_dsflags & DSO_COMPATPARTA) {
419 lp->d_partitions[0].p_size = lp->d_secperunit;
420 lp->d_partitions[0].p_fstype = FS_OTHER;
422 lp->d_magic = DISKMAGIC32;
423 lp->d_magic2 = DISKMAGIC32;
424 lp->d_checksum = dkcksum32(lp);
430 l32_makevirginlabel(disklabel_t lpx, struct diskslices *ssp,
431 struct diskslice *sp, struct disk_info *info)
433 struct disklabel32 *lp = lpx.lab32;
434 struct partition32 *pp;
435 disklabel_t template;
437 template = l32_clone_label(info, NULL);
438 bcopy(template.opaque, lp, sizeof(struct disklabel32));
440 lp->d_magic = DISKMAGIC32;
441 lp->d_magic2 = DISKMAGIC32;
443 lp->d_npartitions = MAXPARTITIONS32;
444 if (lp->d_interleave == 0)
445 lp->d_interleave = 1;
448 if (lp->d_nsectors == 0) /* sectors per track */
450 if (lp->d_ntracks == 0) /* heads */
452 lp->d_ncylinders = 0;
453 lp->d_bbsize = BBSIZE;
454 lp->d_sbsize = SBSIZE;
457 * If the slice or GPT partition is really small we could
458 * wind up with an absurd calculation for ncylinders.
460 while (lp->d_ncylinders < 4) {
461 if (lp->d_ntracks > 1)
463 else if (lp->d_nsectors > 1)
464 lp->d_nsectors >>= 1;
467 lp->d_secpercyl = lp->d_nsectors * lp->d_ntracks;
468 lp->d_ncylinders = sp->ds_size / lp->d_secpercyl;
472 * Set or Modify the partition sizes to accomodate the slice,
473 * since we started with a copy of the virgin label stored
474 * in the whole-disk-slice and we are probably not a
477 lp->d_secperunit = sp->ds_size;
478 pp = &lp->d_partitions[RAW_PART];
480 pp->p_size = lp->d_secperunit;
481 if (info->d_dsflags & DSO_COMPATPARTA) {
482 pp = &lp->d_partitions[0];
484 pp->p_size = lp->d_secperunit;
485 pp->p_fstype = FS_OTHER;
488 lp->d_checksum = dkcksum32(lp);
490 kfree(template.opaque, M_DEVBUF);
494 l32_fixlabel(const char *sname, struct diskslice *sp,
495 disklabel_t lpx, int writeflag)
497 struct disklabel32 *lp;
498 struct partition32 *pp;
507 /* These errors "can't happen" so don't bother reporting details. */
508 if (lp->d_magic != DISKMAGIC32 || lp->d_magic2 != DISKMAGIC32)
509 return ("fixlabel: invalid magic");
510 if (dkcksum32(lp) != 0)
511 return ("fixlabel: invalid checksum");
513 pp = &lp->d_partitions[RAW_PART];
516 * What a mess. For ages old backwards compatibility the disklabel
517 * on-disk stores absolute offsets instead of slice-relative offsets.
518 * So fix it up when reading, writing, or snooping.
520 * The in-core label is always slice-relative.
524 offset = sp->ds_offset;
526 start = sp->ds_offset;
527 offset = -sp->ds_offset;
529 if (pp->p_offset != start) {
532 "%s: rejecting BSD label: raw partition offset != slice offset\n",
534 slice_info(sname, sp);
535 partition_info(sname, RAW_PART, pp);
537 return ("fixlabel: raw partition offset != slice offset");
539 if (pp->p_size != sp->ds_size) {
541 kprintf("%s: raw partition size != slice size\n", sname);
542 slice_info(sname, sp);
543 partition_info(sname, RAW_PART, pp);
545 if (pp->p_size > sp->ds_size) {
547 return ("fixlabel: raw partition size > slice size");
548 kprintf("%s: truncating raw partition\n", sname);
549 pp->p_size = sp->ds_size;
552 end = start + sp->ds_size;
554 return ("fixlabel: slice wraps");
555 if (lp->d_secpercyl <= 0)
556 return ("fixlabel: d_secpercyl <= 0");
559 for (part = 0; part < lp->d_npartitions; part++, pp++) {
560 if (pp->p_offset != 0 || pp->p_size != 0) {
561 if (pp->p_offset < start
562 || pp->p_offset + pp->p_size > end
563 || pp->p_offset + pp->p_size < pp->p_offset) {
566 "%s: rejecting partition in BSD label: it isn't entirely within the slice\n",
569 slice_info(sname, sp);
572 partition_info(sname, part, pp);
574 /* XXX else silently discard junk. */
575 bzero(pp, sizeof *pp);
577 pp->p_offset += offset;
581 lp->d_ncylinders = sp->ds_size / lp->d_secpercyl;
582 lp->d_secperunit = sp->ds_size;
584 lp->d_checksum = dkcksum32(lp);
589 * Set the number of blocks at the beginning of the slice which have
590 * been reserved for label operations. This area will be write-protected
591 * when accessed via the slice.
594 l32_adjust_label_reserved(struct diskslices *ssp, int slice,
595 struct diskslice *sp)
597 /*struct disklabel32 *lp = sp->ds_label.lab32;*/
598 sp->ds_reserved = SBSIZE / ssp->dss_secsize;
602 partition_info(const char *sname, int part, struct partition32 *pp)
604 kprintf("%s%c: start %lu, end %lu, size %lu\n", sname, 'a' + part,
605 (u_long)pp->p_offset, (u_long)(pp->p_offset + pp->p_size - 1),
610 slice_info(const char *sname, struct diskslice *sp)
612 kprintf("%s: start %llu, end %llu, size %llu\n", sname,
613 (long long)sp->ds_offset,
614 (long long)sp->ds_offset + sp->ds_size - 1,
615 (long long)sp->ds_size);
618 struct disklabel_ops disklabel32_ops = {
619 .labelsize = sizeof(struct disklabel32),
620 .op_readdisklabel = l32_readdisklabel,
621 .op_setdisklabel = l32_setdisklabel,
622 .op_writedisklabel = l32_writedisklabel,
623 .op_clone_label = l32_clone_label,
624 .op_adjust_label_reserved = l32_adjust_label_reserved,
625 .op_getpartbounds = l32_getpartbounds,
626 .op_loadpartinfo = l32_loadpartinfo,
627 .op_getnumparts = l32_getnumparts,
628 .op_makevirginlabel = l32_makevirginlabel