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,
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27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * $DragonFly: src/sys/kern/subr_disklabel64.c,v 1.4 2007/06/19 06:39:06 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 * Retrieve the partition start and extent, in blocks. Return 0 on success,
53 l64_getpartbounds(struct diskslices *ssp, disklabel_t lp, u_int32_t part,
54 u_int64_t *start, u_int64_t *blocks)
56 struct partition64 *pp;
58 if (part >= lp.lab64->d_npartitions)
61 pp = &lp.lab64->d_partitions[part];
63 if ((pp->p_boffset & (ssp->dss_secsize - 1)) ||
64 (pp->p_bsize & (ssp->dss_secsize - 1))) {
67 *start = pp->p_boffset / ssp->dss_secsize;
68 *blocks = pp->p_bsize / ssp->dss_secsize;
73 * Get the filesystem type XXX - diskslices code needs to use uuids
76 l64_loadpartinfo(disklabel_t lp, u_int32_t part, struct partinfo *dpart)
78 struct partition64 *pp;
79 const size_t uuid_size = sizeof(struct uuid);
81 if (part < lp.lab64->d_npartitions) {
82 pp = &lp.lab64->d_partitions[part];
83 dpart->fstype_uuid = pp->p_type_uuid;
84 dpart->storage_uuid = pp->p_stor_uuid;
85 dpart->fstype = pp->p_fstype;
87 bzero(&dpart->fstype_uuid, uuid_size);
88 bzero(&dpart->storage_uuid, uuid_size);
94 * Get the number of partitions
97 l64_getnumparts(disklabel_t lp)
99 return(lp.lab64->d_npartitions);
103 * Attempt to read a disk label from a device. 64 bit disklabels are
104 * sector-agnostic and begin at offset 0 on the device. 64 bit disklabels
105 * may only be used with GPT partitioning schemes.
107 * Returns NULL on sucess, and an error string on failure.
110 l64_readdisklabel(cdev_t dev, struct diskslice *sp, disklabel_t *lpp,
111 struct disk_info *info)
114 struct disklabel64 *dlp;
121 secsize = info->d_media_blksize;
122 bpsize = (sizeof(*dlp) + secsize - 1) & ~(secsize - 1);
124 bp = geteblk(bpsize);
125 bp->b_bio1.bio_offset = 0;
126 bp->b_bcount = bpsize;
127 bp->b_flags &= ~B_INVAL;
128 bp->b_cmd = BUF_CMD_READ;
129 dev_dstrategy(dev, &bp->b_bio1);
134 dlp = (struct disklabel64 *)bp->b_data;
135 dlpcrcsize = offsetof(struct disklabel64,
136 d_partitions[dlp->d_npartitions]) -
137 offsetof(struct disklabel64, d_magic);
138 savecrc = dlp->d_crc;
140 if (dlp->d_magic != DISKMAGIC64) {
141 msg = "no disk label";
142 } else if (dlp->d_npartitions > MAXPARTITIONS64) {
143 msg = "disklabel64 corrupted, too many partitions";
144 } else if (savecrc != crc32(&dlp->d_magic, dlpcrcsize)) {
145 msg = "disklabel64 corrupted, bad CRC";
147 dlp->d_crc = savecrc;
148 (*lpp).lab64 = kmalloc(sizeof(*dlp),
149 M_DEVBUF, M_WAITOK|M_ZERO);
150 *(*lpp).lab64 = *dlp;
154 bp->b_flags |= B_INVAL | B_AGE;
160 * If everything is good, copy olpx to nlpx. Check to see if any
161 * open partitions would change.
164 l64_setdisklabel(disklabel_t olpx, disklabel_t nlpx, struct diskslices *ssp,
165 struct diskslice *sp, u_int32_t *openmask)
167 struct disklabel64 *olp, *nlp;
168 struct partition64 *opp, *npp;
178 slicebsize = (uint64_t)sp->ds_size * ssp->dss_secsize;
180 if (nlp->d_magic != DISKMAGIC64)
182 if (nlp->d_npartitions > MAXPARTITIONS64)
184 savecrc = nlp->d_crc;
186 nlpcrcsize = offsetof(struct disklabel64,
187 d_partitions[nlp->d_npartitions]) -
188 offsetof(struct disklabel64, d_magic);
189 if (crc32(&nlp->d_magic, nlpcrcsize) != savecrc) {
190 nlp->d_crc = savecrc;
193 nlp->d_crc = savecrc;
196 * Check if open partitions have changed
200 if (openmask[i >> 5] == 0) {
204 if ((openmask[i >> 5] & (1 << (i & 31))) == 0) {
208 if (nlp->d_npartitions <= i)
210 opp = &olp->d_partitions[i];
211 npp = &nlp->d_partitions[i];
212 if (npp->p_boffset != opp->p_boffset ||
213 npp->p_bsize < opp->p_bsize) {
218 * Do not allow p_type_uuid or p_stor_uuid to change if
219 * the partition is currently open.
221 if (bcmp(&npp->p_type_uuid, &opp->p_type_uuid,
222 sizeof(npp->p_type_uuid)) != 0) {
225 if (bcmp(&npp->p_stor_uuid, &opp->p_stor_uuid,
226 sizeof(npp->p_stor_uuid)) != 0) {
233 * Make sure the label and partition offsets and sizes are sane.
235 if (nlp->d_total_size > slicebsize)
237 if (nlp->d_total_size & (ssp->dss_secsize - 1))
239 if (nlp->d_bbase & (ssp->dss_secsize - 1))
241 if (nlp->d_pbase & (ssp->dss_secsize - 1))
243 if (nlp->d_pstop & (ssp->dss_secsize - 1))
245 if (nlp->d_abase & (ssp->dss_secsize - 1))
248 for (part = 0; part < nlp->d_npartitions; ++part) {
249 npp = &nlp->d_partitions[i];
250 if (npp->p_bsize == 0) {
251 if (npp->p_boffset != 0)
255 if (npp->p_boffset & (ssp->dss_secsize - 1))
257 if (npp->p_bsize & (ssp->dss_secsize - 1))
259 if (npp->p_boffset < nlp->d_pbase)
261 if (npp->p_boffset + npp->p_bsize > nlp->d_total_size)
266 * Structurally we may add code to make modifications above in the
267 * future, so regenerate the crc anyway.
270 nlp->d_crc = crc32(&nlp->d_magic, nlpcrcsize);
277 * Write disk label back to device after modification.
280 l64_writedisklabel(cdev_t dev, struct diskslices *ssp,
281 struct diskslice *sp, disklabel_t lpx)
283 struct disklabel64 *lp;
284 struct disklabel64 *dlp;
292 secsize = ssp->dss_secsize;
293 bpsize = (sizeof(*lp) + secsize - 1) & ~(secsize - 1);
295 bp = geteblk(bpsize);
296 bp->b_bio1.bio_offset = 0;
297 bp->b_bcount = bpsize;
300 * Because our I/O is larger then the label, and because we do not
301 * write the d_reserved0[] area, do a read-modify-write.
303 bp->b_flags &= ~B_INVAL;
304 bp->b_cmd = BUF_CMD_READ;
305 dev_dstrategy(dkmodpart(dev, WHOLE_SLICE_PART), &bp->b_bio1);
310 dlp = (void *)bp->b_data;
311 bcopy(&lp->d_magic, &dlp->d_magic,
312 sizeof(*lp) - offsetof(struct disklabel64, d_magic));
313 bp->b_cmd = BUF_CMD_WRITE;
314 dev_dstrategy(dkmodpart(dev, WHOLE_SLICE_PART), &bp->b_bio1);
317 bp->b_flags |= B_INVAL | B_AGE;
323 * Create a disklabel based on a disk_info structure for the purposes of
324 * DSO_COMPATLABEL - cases where no real label exists on the storage medium.
326 * If a diskslice is passed, the label is truncated to the slice.
328 * NOTE! This is not a legal label because d_bbase and d_pbase are both
332 l64_clone_label(struct disk_info *info, struct diskslice *sp)
334 struct disklabel64 *lp;
336 uint32_t blksize = info->d_media_blksize;
339 lp = kmalloc(sizeof *lp, M_DEVBUF, M_WAITOK | M_ZERO);
342 lp->d_total_size = (uint64_t)sp->ds_size * blksize;
344 lp->d_total_size = info->d_media_blocks * blksize;
346 lp->d_magic = DISKMAGIC64;
347 lp->d_align = blksize;
348 lp->d_npartitions = MAXPARTITIONS64;
349 lp->d_pstop = lp->d_total_size;
352 * Create a dummy 'c' part and a dummy 'a' part (if requested).
353 * Note that the 'c' part is really a hack. 64 bit disklabels
354 * do not use 'c' to mean the raw partition.
357 lp->d_partitions[2].p_boffset = 0;
358 lp->d_partitions[2].p_bsize = lp->d_total_size;
359 /* XXX SET FS TYPE */
361 if (info->d_dsflags & DSO_COMPATPARTA) {
362 lp->d_partitions[0].p_boffset = 0;
363 lp->d_partitions[0].p_bsize = lp->d_total_size;
364 /* XXX SET FS TYPE */
367 lpcrcsize = offsetof(struct disklabel64,
368 d_partitions[lp->d_npartitions]) -
369 offsetof(struct disklabel64, d_magic);
371 lp->d_crc = crc32(&lp->d_magic, lpcrcsize);
377 * Create a virgin disklabel64 suitable for writing to the media.
379 * disklabel64 always reserves 32KB for a boot area and leaves room
380 * for up to RESPARTITIONS64 partitions.
383 l64_makevirginlabel(disklabel_t lpx, struct diskslices *ssp,
384 struct diskslice *sp, struct disk_info *info)
386 struct disklabel64 *lp = lpx.lab64;
387 struct partition64 *pp;
390 uint64_t blkmask; /* 64 bits so we can ~ */
394 * Setup the initial label. Use of a block size of at least 4KB
395 * for calculating the initial reserved areas to allow some degree
396 * of portability between media with different sector sizes.
398 * Note that the modified blksize is stored in d_align as a hint
399 * to the disklabeling program.
401 bzero(lp, sizeof(*lp));
402 if ((blksize = info->d_media_blksize) < 4096)
404 blkmask = blksize - 1;
407 lp->d_total_size = (uint64_t)sp->ds_size * ssp->dss_secsize;
409 lp->d_total_size = info->d_media_blocks * info->d_media_blksize;
411 lp->d_magic = DISKMAGIC64;
412 lp->d_align = blksize;
413 lp->d_npartitions = MAXPARTITIONS64;
414 kern_uuidgen(&lp->d_stor_uuid, 1);
416 ressize = offsetof(struct disklabel64, d_partitions[RESPARTITIONS64]);
417 ressize = (ressize + (uint32_t)blkmask) & ~blkmask;
419 lp->d_bbase = ressize;
420 lp->d_pbase = lp->d_bbase + ((32768 + blkmask) & ~blkmask);
421 lp->d_pstop = (lp->d_total_size - lp->d_bbase) & ~blkmask;
422 lp->d_abase = lp->d_pstop;
425 * All partitions are left empty unless DSO_COMPATPARTA is set
428 if (info->d_dsflags & DSO_COMPATPARTA) {
429 pp = &lp->d_partitions[0];
430 pp->p_boffset = lp->d_pbase;
431 pp->p_bsize = lp->d_pstop - lp->d_pbase;
432 /* XXX SET FS TYPE */
435 lpcrcsize = offsetof(struct disklabel64,
436 d_partitions[lp->d_npartitions]) -
437 offsetof(struct disklabel64, d_magic);
438 lp->d_crc = crc32(&lp->d_magic, lpcrcsize);
442 * Set the number of blocks at the beginning of the slice which have
443 * been reserved for label operations. This area will be write-protected
444 * when accessed via the slice.
446 * For now just protect the label area proper. Do not protect the
447 * boot area. Note partitions in 64 bit disklabels do not overlap
448 * the disklabel or boot area.
451 l64_adjust_label_reserved(struct diskslices *ssp, int slice,
452 struct diskslice *sp)
454 struct disklabel64 *lp = sp->ds_label.lab64;
456 sp->ds_reserved = lp->d_bbase / ssp->dss_secsize;
459 struct disklabel_ops disklabel64_ops = {
460 .labelsize = sizeof(struct disklabel64),
461 .op_readdisklabel = l64_readdisklabel,
462 .op_setdisklabel = l64_setdisklabel,
463 .op_writedisklabel = l64_writedisklabel,
464 .op_clone_label = l64_clone_label,
465 .op_adjust_label_reserved = l64_adjust_label_reserved,
466 .op_getpartbounds = l64_getpartbounds,
467 .op_loadpartinfo = l64_loadpartinfo,
468 .op_getnumparts = l64_getnumparts,
469 .op_makevirginlabel = l64_makevirginlabel