2 * Copyright (c) 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.
13 * 2. Redistributions in binary form must reproduce the above copyright
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.
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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;
28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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 * $DragonFly: src/sys/kern/subr_disklabel64.c,v 1.5 2007/07/20 17:21:51 dillon Exp $
37 #include <sys/param.h>
38 #include <sys/systm.h>
39 #include <sys/kernel.h>
41 #include <sys/disklabel.h>
42 #include <sys/disklabel64.h>
43 #include <sys/diskslice.h>
45 #include <sys/kern_syscall.h>
49 * Alignment against physical start (verses slice start). We use a megabyte
50 * here. Why do we use a megabyte? Because SSDs already use large 128K
51 * blocks internally (for MLC) and who the hell knows in the future.
53 * This way if the sysop picks sane values for partition sizes everything
54 * will be nicely aligned, particularly swap for e.g. swapcache, and
55 * clustered operations against larger physical sector sizes for newer HDs,
58 #define PALIGN_SIZE (1024 * 1024)
59 #define PALIGN_MASK (PALIGN_SIZE - 1)
62 * Retrieve the partition start and extent, in blocks. Return 0 on success,
66 l64_getpartbounds(struct diskslices *ssp, disklabel_t lp, u_int32_t part,
67 u_int64_t *start, u_int64_t *blocks)
69 struct partition64 *pp;
71 if (part >= lp.lab64->d_npartitions)
74 pp = &lp.lab64->d_partitions[part];
76 if ((pp->p_boffset & (ssp->dss_secsize - 1)) ||
77 (pp->p_bsize & (ssp->dss_secsize - 1))) {
80 *start = pp->p_boffset / ssp->dss_secsize;
81 *blocks = pp->p_bsize / ssp->dss_secsize;
86 * Get the filesystem type XXX - diskslices code needs to use uuids
89 l64_loadpartinfo(disklabel_t lp, u_int32_t part, struct partinfo *dpart)
91 struct partition64 *pp;
92 const size_t uuid_size = sizeof(struct uuid);
94 if (part < lp.lab64->d_npartitions) {
95 pp = &lp.lab64->d_partitions[part];
96 dpart->fstype_uuid = pp->p_type_uuid;
97 dpart->storage_uuid = pp->p_stor_uuid;
98 dpart->fstype = pp->p_fstype;
100 bzero(&dpart->fstype_uuid, uuid_size);
101 bzero(&dpart->storage_uuid, uuid_size);
107 * Get the number of partitions
110 l64_getnumparts(disklabel_t lp)
112 return(lp.lab64->d_npartitions);
116 l64_freedisklabel(disklabel_t *lpp)
118 kfree((*lpp).lab64, M_DEVBUF);
123 * Attempt to read a disk label from a device. 64 bit disklabels are
124 * sector-agnostic and begin at offset 0 on the device. 64 bit disklabels
125 * may only be used with GPT partitioning schemes.
127 * Returns NULL on sucess, and an error string on failure.
130 l64_readdisklabel(cdev_t dev, struct diskslice *sp, disklabel_t *lpp,
131 struct disk_info *info)
134 struct disklabel64 *dlp;
142 * XXX I/O size is subject to device DMA limitations
144 secsize = info->d_media_blksize;
145 bpsize = (sizeof(*dlp) + secsize - 1) & ~(secsize - 1);
147 bp = geteblk(bpsize);
148 bp->b_bio1.bio_offset = 0;
149 bp->b_bio1.bio_done = biodone_sync;
150 bp->b_bio1.bio_flags |= BIO_SYNC;
151 bp->b_bcount = bpsize;
152 bp->b_flags &= ~B_INVAL;
153 bp->b_flags |= B_FAILONDIS;
154 bp->b_cmd = BUF_CMD_READ;
155 dev_dstrategy(dev, &bp->b_bio1);
157 if (biowait(&bp->b_bio1, "labrd")) {
160 dlp = (struct disklabel64 *)bp->b_data;
161 dlpcrcsize = offsetof(struct disklabel64,
162 d_partitions[dlp->d_npartitions]) -
163 offsetof(struct disklabel64, d_magic);
164 savecrc = dlp->d_crc;
166 if (dlp->d_magic != DISKMAGIC64) {
167 msg = "no disk label";
168 } else if (dlp->d_npartitions > MAXPARTITIONS64) {
169 msg = "disklabel64 corrupted, too many partitions";
170 } else if (savecrc != crc32(&dlp->d_magic, dlpcrcsize)) {
171 msg = "disklabel64 corrupted, bad CRC";
173 dlp->d_crc = savecrc;
174 (*lpp).lab64 = kmalloc(sizeof(*dlp),
175 M_DEVBUF, M_WAITOK|M_ZERO);
176 *(*lpp).lab64 = *dlp;
180 bp->b_flags |= B_INVAL | B_AGE;
186 * If everything is good, copy olpx to nlpx. Check to see if any
187 * open partitions would change.
190 l64_setdisklabel(disklabel_t olpx, disklabel_t nlpx, struct diskslices *ssp,
191 struct diskslice *sp, u_int32_t *openmask)
193 struct disklabel64 *olp, *nlp;
194 struct partition64 *opp, *npp;
203 slicebsize = (uint64_t)sp->ds_size * ssp->dss_secsize;
205 if (nlp->d_magic != DISKMAGIC64)
207 if (nlp->d_npartitions > MAXPARTITIONS64)
209 savecrc = nlp->d_crc;
211 nlpcrcsize = offsetof(struct disklabel64,
212 d_partitions[nlp->d_npartitions]) -
213 offsetof(struct disklabel64, d_magic);
214 if (crc32(&nlp->d_magic, nlpcrcsize) != savecrc) {
215 nlp->d_crc = savecrc;
218 nlp->d_crc = savecrc;
221 * Check if open partitions have changed
224 while (i < MAXPARTITIONS64) {
225 if (openmask[i >> 5] == 0) {
229 if ((openmask[i >> 5] & (1 << (i & 31))) == 0) {
233 if (nlp->d_npartitions <= i)
235 opp = &olp->d_partitions[i];
236 npp = &nlp->d_partitions[i];
237 if (npp->p_boffset != opp->p_boffset ||
238 npp->p_bsize < opp->p_bsize) {
243 * Do not allow p_type_uuid or p_stor_uuid to change if
244 * the partition is currently open.
246 if (bcmp(&npp->p_type_uuid, &opp->p_type_uuid,
247 sizeof(npp->p_type_uuid)) != 0) {
250 if (bcmp(&npp->p_stor_uuid, &opp->p_stor_uuid,
251 sizeof(npp->p_stor_uuid)) != 0) {
258 * Make sure the label and partition offsets and sizes are sane.
260 if (nlp->d_total_size > slicebsize)
262 if (nlp->d_total_size & (ssp->dss_secsize - 1))
264 if (nlp->d_bbase & (ssp->dss_secsize - 1))
266 if (nlp->d_pbase & (ssp->dss_secsize - 1))
268 if (nlp->d_pstop & (ssp->dss_secsize - 1))
270 if (nlp->d_abase & (ssp->dss_secsize - 1))
273 for (i = 0; i < nlp->d_npartitions; ++i) {
274 npp = &nlp->d_partitions[i];
275 if (npp->p_bsize == 0) {
276 if (npp->p_boffset != 0)
280 if (npp->p_boffset & (ssp->dss_secsize - 1))
282 if (npp->p_bsize & (ssp->dss_secsize - 1))
284 if (npp->p_boffset < nlp->d_pbase)
286 if (npp->p_boffset + npp->p_bsize > nlp->d_total_size)
291 * Structurally we may add code to make modifications above in the
292 * future, so regenerate the crc anyway.
295 nlp->d_crc = crc32(&nlp->d_magic, nlpcrcsize);
302 * Write disk label back to device after modification.
305 l64_writedisklabel(cdev_t dev, struct diskslices *ssp,
306 struct diskslice *sp, disklabel_t lpx)
308 struct disklabel64 *lp;
309 struct disklabel64 *dlp;
318 * XXX I/O size is subject to device DMA limitations
320 secsize = ssp->dss_secsize;
321 bpsize = (sizeof(*lp) + secsize - 1) & ~(secsize - 1);
323 bp = geteblk(bpsize);
324 bp->b_bio1.bio_offset = 0;
325 bp->b_bio1.bio_done = biodone_sync;
326 bp->b_bio1.bio_flags |= BIO_SYNC;
327 bp->b_bcount = bpsize;
328 bp->b_flags |= B_FAILONDIS;
331 * Because our I/O is larger then the label, and because we do not
332 * write the d_reserved0[] area, do a read-modify-write.
334 bp->b_flags &= ~B_INVAL;
335 bp->b_cmd = BUF_CMD_READ;
336 KKASSERT(dkpart(dev) == WHOLE_SLICE_PART);
337 dev_dstrategy(dev, &bp->b_bio1);
338 error = biowait(&bp->b_bio1, "labrd");
342 dlp = (void *)bp->b_data;
343 bcopy(&lp->d_magic, &dlp->d_magic,
344 sizeof(*lp) - offsetof(struct disklabel64, d_magic));
345 bp->b_cmd = BUF_CMD_WRITE;
346 bp->b_bio1.bio_done = biodone_sync;
347 bp->b_bio1.bio_flags |= BIO_SYNC;
348 KKASSERT(dkpart(dev) == WHOLE_SLICE_PART);
349 dev_dstrategy(dev, &bp->b_bio1);
350 error = biowait(&bp->b_bio1, "labwr");
352 bp->b_flags |= B_INVAL | B_AGE;
358 * Create a disklabel based on a disk_info structure for the purposes of
359 * DSO_COMPATLABEL - cases where no real label exists on the storage medium.
361 * If a diskslice is passed, the label is truncated to the slice.
363 * NOTE! This is not a legal label because d_bbase and d_pbase are both
367 l64_clone_label(struct disk_info *info, struct diskslice *sp)
369 struct disklabel64 *lp;
371 uint32_t blksize = info->d_media_blksize;
374 lp = kmalloc(sizeof *lp, M_DEVBUF, M_WAITOK | M_ZERO);
377 lp->d_total_size = (uint64_t)sp->ds_size * blksize;
379 lp->d_total_size = info->d_media_blocks * blksize;
381 lp->d_magic = DISKMAGIC64;
382 lp->d_align = blksize;
383 lp->d_npartitions = MAXPARTITIONS64;
384 lp->d_pstop = lp->d_total_size;
387 * Create a dummy 'c' part and a dummy 'a' part (if requested).
388 * Note that the 'c' part is really a hack. 64 bit disklabels
389 * do not use 'c' to mean the raw partition.
392 lp->d_partitions[2].p_boffset = 0;
393 lp->d_partitions[2].p_bsize = lp->d_total_size;
394 /* XXX SET FS TYPE */
396 if (info->d_dsflags & DSO_COMPATPARTA) {
397 lp->d_partitions[0].p_boffset = 0;
398 lp->d_partitions[0].p_bsize = lp->d_total_size;
399 /* XXX SET FS TYPE */
402 lpcrcsize = offsetof(struct disklabel64,
403 d_partitions[lp->d_npartitions]) -
404 offsetof(struct disklabel64, d_magic);
406 lp->d_crc = crc32(&lp->d_magic, lpcrcsize);
412 * Create a virgin disklabel64 suitable for writing to the media.
414 * disklabel64 always reserves 32KB for a boot area and leaves room
415 * for up to RESPARTITIONS64 partitions.
418 l64_makevirginlabel(disklabel_t lpx, struct diskslices *ssp,
419 struct diskslice *sp, struct disk_info *info)
421 struct disklabel64 *lp = lpx.lab64;
422 struct partition64 *pp;
425 uint64_t blkmask; /* 64 bits so we can ~ */
429 * Setup the initial label. Use of a block size of at least 4KB
430 * for calculating the initial reserved areas to allow some degree
431 * of portability between media with different sector sizes.
433 * Note that the modified blksize is stored in d_align as a hint
434 * to the disklabeling program.
436 bzero(lp, sizeof(*lp));
437 if ((blksize = info->d_media_blksize) < 4096)
439 blkmask = blksize - 1;
442 lp->d_total_size = (uint64_t)sp->ds_size * ssp->dss_secsize;
444 lp->d_total_size = info->d_media_blocks * info->d_media_blksize;
446 lp->d_magic = DISKMAGIC64;
447 lp->d_align = blksize;
448 lp->d_npartitions = MAXPARTITIONS64;
449 kern_uuidgen(&lp->d_stor_uuid, 1);
451 ressize = offsetof(struct disklabel64, d_partitions[RESPARTITIONS64]);
452 ressize = (ressize + (uint32_t)blkmask) & ~blkmask;
455 * NOTE: When calculating pbase take into account the slice offset
456 * so the partitions are at least 32K-aligned relative to the
457 * start of the physical disk. This will accomodate efficient
458 * access to 4096 byte physical sector drives.
460 lp->d_bbase = ressize;
461 lp->d_pbase = lp->d_bbase + ((32768 + blkmask) & ~blkmask);
462 lp->d_pbase = (lp->d_pbase + PALIGN_MASK) & ~(uint64_t)PALIGN_MASK;
464 /* adjust for slice offset so we are physically aligned */
465 lp->d_pbase += 32768 - (sp->ds_offset * info->d_media_blksize) % 32768;
467 lp->d_pstop = (lp->d_total_size - lp->d_bbase) & ~blkmask;
468 lp->d_abase = lp->d_pstop;
471 * All partitions are left empty unless DSO_COMPATPARTA is set
474 if (info->d_dsflags & DSO_COMPATPARTA) {
475 pp = &lp->d_partitions[0];
476 pp->p_boffset = lp->d_pbase;
477 pp->p_bsize = lp->d_pstop - lp->d_pbase;
478 /* XXX SET FS TYPE */
481 lpcrcsize = offsetof(struct disklabel64,
482 d_partitions[lp->d_npartitions]) -
483 offsetof(struct disklabel64, d_magic);
484 lp->d_crc = crc32(&lp->d_magic, lpcrcsize);
488 * Set the number of blocks at the beginning of the slice which have
489 * been reserved for label operations. This area will be write-protected
490 * when accessed via the slice.
492 * For now just protect the label area proper. Do not protect the
493 * boot area. Note partitions in 64 bit disklabels do not overlap
494 * the disklabel or boot area.
497 l64_adjust_label_reserved(struct diskslices *ssp, int slice,
498 struct diskslice *sp)
500 struct disklabel64 *lp = sp->ds_label.lab64;
502 sp->ds_reserved = lp->d_bbase / ssp->dss_secsize;
505 struct disklabel_ops disklabel64_ops = {
506 .labelsize = sizeof(struct disklabel64),
507 .op_readdisklabel = l64_readdisklabel,
508 .op_setdisklabel = l64_setdisklabel,
509 .op_writedisklabel = l64_writedisklabel,
510 .op_clone_label = l64_clone_label,
511 .op_adjust_label_reserved = l64_adjust_label_reserved,
512 .op_getpartbounds = l64_getpartbounds,
513 .op_loadpartinfo = l64_loadpartinfo,
514 .op_getnumparts = l64_getnumparts,
515 .op_makevirginlabel = l64_makevirginlabel,
516 .op_freedisklabel = l64_freedisklabel