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 * Attempt to read a disk label from a device. 64 bit disklabels are
117 * sector-agnostic and begin at offset 0 on the device. 64 bit disklabels
118 * may only be used with GPT partitioning schemes.
120 * Returns NULL on sucess, and an error string on failure.
123 l64_readdisklabel(cdev_t dev, struct diskslice *sp, disklabel_t *lpp,
124 struct disk_info *info)
127 struct disklabel64 *dlp;
135 * XXX I/O size is subject to device DMA limitations
137 secsize = info->d_media_blksize;
138 bpsize = (sizeof(*dlp) + secsize - 1) & ~(secsize - 1);
140 bp = geteblk(bpsize);
141 bp->b_bio1.bio_offset = 0;
142 bp->b_bio1.bio_done = biodone_sync;
143 bp->b_bio1.bio_flags |= BIO_SYNC;
144 bp->b_bcount = bpsize;
145 bp->b_flags &= ~B_INVAL;
146 bp->b_cmd = BUF_CMD_READ;
147 dev_dstrategy(dev, &bp->b_bio1);
149 if (biowait(&bp->b_bio1, "labrd")) {
152 dlp = (struct disklabel64 *)bp->b_data;
153 dlpcrcsize = offsetof(struct disklabel64,
154 d_partitions[dlp->d_npartitions]) -
155 offsetof(struct disklabel64, d_magic);
156 savecrc = dlp->d_crc;
158 if (dlp->d_magic != DISKMAGIC64) {
159 msg = "no disk label";
160 } else if (dlp->d_npartitions > MAXPARTITIONS64) {
161 msg = "disklabel64 corrupted, too many partitions";
162 } else if (savecrc != crc32(&dlp->d_magic, dlpcrcsize)) {
163 msg = "disklabel64 corrupted, bad CRC";
165 dlp->d_crc = savecrc;
166 (*lpp).lab64 = kmalloc(sizeof(*dlp),
167 M_DEVBUF, M_WAITOK|M_ZERO);
168 *(*lpp).lab64 = *dlp;
172 bp->b_flags |= B_INVAL | B_AGE;
178 * If everything is good, copy olpx to nlpx. Check to see if any
179 * open partitions would change.
182 l64_setdisklabel(disklabel_t olpx, disklabel_t nlpx, struct diskslices *ssp,
183 struct diskslice *sp, u_int32_t *openmask)
185 struct disklabel64 *olp, *nlp;
186 struct partition64 *opp, *npp;
195 slicebsize = (uint64_t)sp->ds_size * ssp->dss_secsize;
197 if (nlp->d_magic != DISKMAGIC64)
199 if (nlp->d_npartitions > MAXPARTITIONS64)
201 savecrc = nlp->d_crc;
203 nlpcrcsize = offsetof(struct disklabel64,
204 d_partitions[nlp->d_npartitions]) -
205 offsetof(struct disklabel64, d_magic);
206 if (crc32(&nlp->d_magic, nlpcrcsize) != savecrc) {
207 nlp->d_crc = savecrc;
210 nlp->d_crc = savecrc;
213 * Check if open partitions have changed
216 while (i < MAXPARTITIONS64) {
217 if (openmask[i >> 5] == 0) {
221 if ((openmask[i >> 5] & (1 << (i & 31))) == 0) {
225 if (nlp->d_npartitions <= i)
227 opp = &olp->d_partitions[i];
228 npp = &nlp->d_partitions[i];
229 if (npp->p_boffset != opp->p_boffset ||
230 npp->p_bsize < opp->p_bsize) {
235 * Do not allow p_type_uuid or p_stor_uuid to change if
236 * the partition is currently open.
238 if (bcmp(&npp->p_type_uuid, &opp->p_type_uuid,
239 sizeof(npp->p_type_uuid)) != 0) {
242 if (bcmp(&npp->p_stor_uuid, &opp->p_stor_uuid,
243 sizeof(npp->p_stor_uuid)) != 0) {
250 * Make sure the label and partition offsets and sizes are sane.
252 if (nlp->d_total_size > slicebsize)
254 if (nlp->d_total_size & (ssp->dss_secsize - 1))
256 if (nlp->d_bbase & (ssp->dss_secsize - 1))
258 if (nlp->d_pbase & (ssp->dss_secsize - 1))
260 if (nlp->d_pstop & (ssp->dss_secsize - 1))
262 if (nlp->d_abase & (ssp->dss_secsize - 1))
265 for (i = 0; i < nlp->d_npartitions; ++i) {
266 npp = &nlp->d_partitions[i];
267 if (npp->p_bsize == 0) {
268 if (npp->p_boffset != 0)
272 if (npp->p_boffset & (ssp->dss_secsize - 1))
274 if (npp->p_bsize & (ssp->dss_secsize - 1))
276 if (npp->p_boffset < nlp->d_pbase)
278 if (npp->p_boffset + npp->p_bsize > nlp->d_total_size)
283 * Structurally we may add code to make modifications above in the
284 * future, so regenerate the crc anyway.
287 nlp->d_crc = crc32(&nlp->d_magic, nlpcrcsize);
294 * Write disk label back to device after modification.
297 l64_writedisklabel(cdev_t dev, struct diskslices *ssp,
298 struct diskslice *sp, disklabel_t lpx)
300 struct disklabel64 *lp;
301 struct disklabel64 *dlp;
310 * XXX I/O size is subject to device DMA limitations
312 secsize = ssp->dss_secsize;
313 bpsize = (sizeof(*lp) + secsize - 1) & ~(secsize - 1);
315 bp = geteblk(bpsize);
316 bp->b_bio1.bio_offset = 0;
317 bp->b_bio1.bio_done = biodone_sync;
318 bp->b_bio1.bio_flags |= BIO_SYNC;
319 bp->b_bcount = bpsize;
322 * Because our I/O is larger then the label, and because we do not
323 * write the d_reserved0[] area, do a read-modify-write.
325 bp->b_flags &= ~B_INVAL;
326 bp->b_cmd = BUF_CMD_READ;
327 KKASSERT(dkpart(dev) == WHOLE_SLICE_PART);
328 dev_dstrategy(dev, &bp->b_bio1);
329 error = biowait(&bp->b_bio1, "labrd");
333 dlp = (void *)bp->b_data;
334 bcopy(&lp->d_magic, &dlp->d_magic,
335 sizeof(*lp) - offsetof(struct disklabel64, d_magic));
336 bp->b_cmd = BUF_CMD_WRITE;
337 bp->b_bio1.bio_done = biodone_sync;
338 bp->b_bio1.bio_flags |= BIO_SYNC;
339 KKASSERT(dkpart(dev) == WHOLE_SLICE_PART);
340 dev_dstrategy(dev, &bp->b_bio1);
341 error = biowait(&bp->b_bio1, "labwr");
343 bp->b_flags |= B_INVAL | B_AGE;
349 * Create a disklabel based on a disk_info structure for the purposes of
350 * DSO_COMPATLABEL - cases where no real label exists on the storage medium.
352 * If a diskslice is passed, the label is truncated to the slice.
354 * NOTE! This is not a legal label because d_bbase and d_pbase are both
358 l64_clone_label(struct disk_info *info, struct diskslice *sp)
360 struct disklabel64 *lp;
362 uint32_t blksize = info->d_media_blksize;
365 lp = kmalloc(sizeof *lp, M_DEVBUF, M_WAITOK | M_ZERO);
368 lp->d_total_size = (uint64_t)sp->ds_size * blksize;
370 lp->d_total_size = info->d_media_blocks * blksize;
372 lp->d_magic = DISKMAGIC64;
373 lp->d_align = blksize;
374 lp->d_npartitions = MAXPARTITIONS64;
375 lp->d_pstop = lp->d_total_size;
378 * Create a dummy 'c' part and a dummy 'a' part (if requested).
379 * Note that the 'c' part is really a hack. 64 bit disklabels
380 * do not use 'c' to mean the raw partition.
383 lp->d_partitions[2].p_boffset = 0;
384 lp->d_partitions[2].p_bsize = lp->d_total_size;
385 /* XXX SET FS TYPE */
387 if (info->d_dsflags & DSO_COMPATPARTA) {
388 lp->d_partitions[0].p_boffset = 0;
389 lp->d_partitions[0].p_bsize = lp->d_total_size;
390 /* XXX SET FS TYPE */
393 lpcrcsize = offsetof(struct disklabel64,
394 d_partitions[lp->d_npartitions]) -
395 offsetof(struct disklabel64, d_magic);
397 lp->d_crc = crc32(&lp->d_magic, lpcrcsize);
403 * Create a virgin disklabel64 suitable for writing to the media.
405 * disklabel64 always reserves 32KB for a boot area and leaves room
406 * for up to RESPARTITIONS64 partitions.
409 l64_makevirginlabel(disklabel_t lpx, struct diskslices *ssp,
410 struct diskslice *sp, struct disk_info *info)
412 struct disklabel64 *lp = lpx.lab64;
413 struct partition64 *pp;
416 uint64_t blkmask; /* 64 bits so we can ~ */
420 * Setup the initial label. Use of a block size of at least 4KB
421 * for calculating the initial reserved areas to allow some degree
422 * of portability between media with different sector sizes.
424 * Note that the modified blksize is stored in d_align as a hint
425 * to the disklabeling program.
427 bzero(lp, sizeof(*lp));
428 if ((blksize = info->d_media_blksize) < 4096)
430 blkmask = blksize - 1;
433 lp->d_total_size = (uint64_t)sp->ds_size * ssp->dss_secsize;
435 lp->d_total_size = info->d_media_blocks * info->d_media_blksize;
437 lp->d_magic = DISKMAGIC64;
438 lp->d_align = blksize;
439 lp->d_npartitions = MAXPARTITIONS64;
440 kern_uuidgen(&lp->d_stor_uuid, 1);
442 ressize = offsetof(struct disklabel64, d_partitions[RESPARTITIONS64]);
443 ressize = (ressize + (uint32_t)blkmask) & ~blkmask;
446 * NOTE: When calculating pbase take into account the slice offset
447 * so the partitions are at least 32K-aligned relative to the
448 * start of the physical disk. This will accomodate efficient
449 * access to 4096 byte physical sector drives.
451 lp->d_bbase = ressize;
452 lp->d_pbase = lp->d_bbase + ((32768 + blkmask) & ~blkmask);
453 lp->d_pbase = (lp->d_pbase + PALIGN_MASK) & ~(uint64_t)PALIGN_MASK;
455 /* adjust for slice offset so we are physically aligned */
456 lp->d_pbase += 32768 - (sp->ds_offset * info->d_media_blksize) % 32768;
458 lp->d_pstop = (lp->d_total_size - lp->d_bbase) & ~blkmask;
459 lp->d_abase = lp->d_pstop;
462 * All partitions are left empty unless DSO_COMPATPARTA is set
465 if (info->d_dsflags & DSO_COMPATPARTA) {
466 pp = &lp->d_partitions[0];
467 pp->p_boffset = lp->d_pbase;
468 pp->p_bsize = lp->d_pstop - lp->d_pbase;
469 /* XXX SET FS TYPE */
472 lpcrcsize = offsetof(struct disklabel64,
473 d_partitions[lp->d_npartitions]) -
474 offsetof(struct disklabel64, d_magic);
475 lp->d_crc = crc32(&lp->d_magic, lpcrcsize);
479 * Set the number of blocks at the beginning of the slice which have
480 * been reserved for label operations. This area will be write-protected
481 * when accessed via the slice.
483 * For now just protect the label area proper. Do not protect the
484 * boot area. Note partitions in 64 bit disklabels do not overlap
485 * the disklabel or boot area.
488 l64_adjust_label_reserved(struct diskslices *ssp, int slice,
489 struct diskslice *sp)
491 struct disklabel64 *lp = sp->ds_label.lab64;
493 sp->ds_reserved = lp->d_bbase / ssp->dss_secsize;
496 struct disklabel_ops disklabel64_ops = {
497 .labelsize = sizeof(struct disklabel64),
498 .op_readdisklabel = l64_readdisklabel,
499 .op_setdisklabel = l64_setdisklabel,
500 .op_writedisklabel = l64_writedisklabel,
501 .op_clone_label = l64_clone_label,
502 .op_adjust_label_reserved = l64_adjust_label_reserved,
503 .op_getpartbounds = l64_getpartbounds,
504 .op_loadpartinfo = l64_loadpartinfo,
505 .op_getnumparts = l64_getnumparts,
506 .op_makevirginlabel = l64_makevirginlabel