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 * 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
;
122 * XXX I/O size is subject to device DMA limitations
124 secsize
= info
->d_media_blksize
;
125 bpsize
= (sizeof(*dlp
) + secsize
- 1) & ~(secsize
- 1);
127 bp
= geteblk(bpsize
);
128 bp
->b_bio1
.bio_offset
= 0;
129 bp
->b_bio1
.bio_done
= biodone_sync
;
130 bp
->b_bio1
.bio_flags
|= BIO_SYNC
;
131 bp
->b_bcount
= bpsize
;
132 bp
->b_flags
&= ~B_INVAL
;
133 bp
->b_cmd
= BUF_CMD_READ
;
134 dev_dstrategy(dev
, &bp
->b_bio1
);
136 if (biowait(&bp
->b_bio1
, "labrd")) {
139 dlp
= (struct disklabel64
*)bp
->b_data
;
140 dlpcrcsize
= offsetof(struct disklabel64
,
141 d_partitions
[dlp
->d_npartitions
]) -
142 offsetof(struct disklabel64
, d_magic
);
143 savecrc
= dlp
->d_crc
;
145 if (dlp
->d_magic
!= DISKMAGIC64
) {
146 msg
= "no disk label";
147 } else if (dlp
->d_npartitions
> MAXPARTITIONS64
) {
148 msg
= "disklabel64 corrupted, too many partitions";
149 } else if (savecrc
!= crc32(&dlp
->d_magic
, dlpcrcsize
)) {
150 msg
= "disklabel64 corrupted, bad CRC";
152 dlp
->d_crc
= savecrc
;
153 (*lpp
).lab64
= kmalloc(sizeof(*dlp
),
154 M_DEVBUF
, M_WAITOK
|M_ZERO
);
155 *(*lpp
).lab64
= *dlp
;
159 bp
->b_flags
|= B_INVAL
| B_AGE
;
165 * If everything is good, copy olpx to nlpx. Check to see if any
166 * open partitions would change.
169 l64_setdisklabel(disklabel_t olpx
, disklabel_t nlpx
, struct diskslices
*ssp
,
170 struct diskslice
*sp
, u_int32_t
*openmask
)
172 struct disklabel64
*olp
, *nlp
;
173 struct partition64
*opp
, *npp
;
182 slicebsize
= (uint64_t)sp
->ds_size
* ssp
->dss_secsize
;
184 if (nlp
->d_magic
!= DISKMAGIC64
)
186 if (nlp
->d_npartitions
> MAXPARTITIONS64
)
188 savecrc
= nlp
->d_crc
;
190 nlpcrcsize
= offsetof(struct disklabel64
,
191 d_partitions
[nlp
->d_npartitions
]) -
192 offsetof(struct disklabel64
, d_magic
);
193 if (crc32(&nlp
->d_magic
, nlpcrcsize
) != savecrc
) {
194 nlp
->d_crc
= savecrc
;
197 nlp
->d_crc
= savecrc
;
200 * Check if open partitions have changed
203 while (i
< MAXPARTITIONS64
) {
204 if (openmask
[i
>> 5] == 0) {
208 if ((openmask
[i
>> 5] & (1 << (i
& 31))) == 0) {
212 if (nlp
->d_npartitions
<= i
)
214 opp
= &olp
->d_partitions
[i
];
215 npp
= &nlp
->d_partitions
[i
];
216 if (npp
->p_boffset
!= opp
->p_boffset
||
217 npp
->p_bsize
< opp
->p_bsize
) {
222 * Do not allow p_type_uuid or p_stor_uuid to change if
223 * the partition is currently open.
225 if (bcmp(&npp
->p_type_uuid
, &opp
->p_type_uuid
,
226 sizeof(npp
->p_type_uuid
)) != 0) {
229 if (bcmp(&npp
->p_stor_uuid
, &opp
->p_stor_uuid
,
230 sizeof(npp
->p_stor_uuid
)) != 0) {
237 * Make sure the label and partition offsets and sizes are sane.
239 if (nlp
->d_total_size
> slicebsize
)
241 if (nlp
->d_total_size
& (ssp
->dss_secsize
- 1))
243 if (nlp
->d_bbase
& (ssp
->dss_secsize
- 1))
245 if (nlp
->d_pbase
& (ssp
->dss_secsize
- 1))
247 if (nlp
->d_pstop
& (ssp
->dss_secsize
- 1))
249 if (nlp
->d_abase
& (ssp
->dss_secsize
- 1))
252 for (i
= 0; i
< nlp
->d_npartitions
; ++i
) {
253 npp
= &nlp
->d_partitions
[i
];
254 if (npp
->p_bsize
== 0) {
255 if (npp
->p_boffset
!= 0)
259 if (npp
->p_boffset
& (ssp
->dss_secsize
- 1))
261 if (npp
->p_bsize
& (ssp
->dss_secsize
- 1))
263 if (npp
->p_boffset
< nlp
->d_pbase
)
265 if (npp
->p_boffset
+ npp
->p_bsize
> nlp
->d_total_size
)
270 * Structurally we may add code to make modifications above in the
271 * future, so regenerate the crc anyway.
274 nlp
->d_crc
= crc32(&nlp
->d_magic
, nlpcrcsize
);
281 * Write disk label back to device after modification.
284 l64_writedisklabel(cdev_t dev
, struct diskslices
*ssp
,
285 struct diskslice
*sp
, disklabel_t lpx
)
287 struct disklabel64
*lp
;
288 struct disklabel64
*dlp
;
297 * XXX I/O size is subject to device DMA limitations
299 secsize
= ssp
->dss_secsize
;
300 bpsize
= (sizeof(*lp
) + secsize
- 1) & ~(secsize
- 1);
302 bp
= geteblk(bpsize
);
303 bp
->b_bio1
.bio_offset
= 0;
304 bp
->b_bio1
.bio_done
= biodone_sync
;
305 bp
->b_bio1
.bio_flags
|= BIO_SYNC
;
306 bp
->b_bcount
= bpsize
;
309 * Because our I/O is larger then the label, and because we do not
310 * write the d_reserved0[] area, do a read-modify-write.
312 bp
->b_flags
&= ~B_INVAL
;
313 bp
->b_cmd
= BUF_CMD_READ
;
314 KKASSERT(dkpart(dev
) == WHOLE_SLICE_PART
);
315 dev_dstrategy(dev
, &bp
->b_bio1
);
316 error
= biowait(&bp
->b_bio1
, "labrd");
320 dlp
= (void *)bp
->b_data
;
321 bcopy(&lp
->d_magic
, &dlp
->d_magic
,
322 sizeof(*lp
) - offsetof(struct disklabel64
, d_magic
));
323 bp
->b_cmd
= BUF_CMD_WRITE
;
324 bp
->b_bio1
.bio_done
= biodone_sync
;
325 bp
->b_bio1
.bio_flags
|= BIO_SYNC
;
326 KKASSERT(dkpart(dev
) == WHOLE_SLICE_PART
);
327 dev_dstrategy(dev
, &bp
->b_bio1
);
328 error
= biowait(&bp
->b_bio1
, "labwr");
330 bp
->b_flags
|= B_INVAL
| B_AGE
;
336 * Create a disklabel based on a disk_info structure for the purposes of
337 * DSO_COMPATLABEL - cases where no real label exists on the storage medium.
339 * If a diskslice is passed, the label is truncated to the slice.
341 * NOTE! This is not a legal label because d_bbase and d_pbase are both
345 l64_clone_label(struct disk_info
*info
, struct diskslice
*sp
)
347 struct disklabel64
*lp
;
349 uint32_t blksize
= info
->d_media_blksize
;
352 lp
= kmalloc(sizeof *lp
, M_DEVBUF
, M_WAITOK
| M_ZERO
);
355 lp
->d_total_size
= (uint64_t)sp
->ds_size
* blksize
;
357 lp
->d_total_size
= info
->d_media_blocks
* blksize
;
359 lp
->d_magic
= DISKMAGIC64
;
360 lp
->d_align
= blksize
;
361 lp
->d_npartitions
= MAXPARTITIONS64
;
362 lp
->d_pstop
= lp
->d_total_size
;
365 * Create a dummy 'c' part and a dummy 'a' part (if requested).
366 * Note that the 'c' part is really a hack. 64 bit disklabels
367 * do not use 'c' to mean the raw partition.
370 lp
->d_partitions
[2].p_boffset
= 0;
371 lp
->d_partitions
[2].p_bsize
= lp
->d_total_size
;
372 /* XXX SET FS TYPE */
374 if (info
->d_dsflags
& DSO_COMPATPARTA
) {
375 lp
->d_partitions
[0].p_boffset
= 0;
376 lp
->d_partitions
[0].p_bsize
= lp
->d_total_size
;
377 /* XXX SET FS TYPE */
380 lpcrcsize
= offsetof(struct disklabel64
,
381 d_partitions
[lp
->d_npartitions
]) -
382 offsetof(struct disklabel64
, d_magic
);
384 lp
->d_crc
= crc32(&lp
->d_magic
, lpcrcsize
);
390 * Create a virgin disklabel64 suitable for writing to the media.
392 * disklabel64 always reserves 32KB for a boot area and leaves room
393 * for up to RESPARTITIONS64 partitions.
396 l64_makevirginlabel(disklabel_t lpx
, struct diskslices
*ssp
,
397 struct diskslice
*sp
, struct disk_info
*info
)
399 struct disklabel64
*lp
= lpx
.lab64
;
400 struct partition64
*pp
;
403 uint64_t blkmask
; /* 64 bits so we can ~ */
407 * Setup the initial label. Use of a block size of at least 4KB
408 * for calculating the initial reserved areas to allow some degree
409 * of portability between media with different sector sizes.
411 * Note that the modified blksize is stored in d_align as a hint
412 * to the disklabeling program.
414 bzero(lp
, sizeof(*lp
));
415 if ((blksize
= info
->d_media_blksize
) < 4096)
417 blkmask
= blksize
- 1;
420 lp
->d_total_size
= (uint64_t)sp
->ds_size
* ssp
->dss_secsize
;
422 lp
->d_total_size
= info
->d_media_blocks
* info
->d_media_blksize
;
424 lp
->d_magic
= DISKMAGIC64
;
425 lp
->d_align
= blksize
;
426 lp
->d_npartitions
= MAXPARTITIONS64
;
427 kern_uuidgen(&lp
->d_stor_uuid
, 1);
429 ressize
= offsetof(struct disklabel64
, d_partitions
[RESPARTITIONS64
]);
430 ressize
= (ressize
+ (uint32_t)blkmask
) & ~blkmask
;
432 lp
->d_bbase
= ressize
;
433 lp
->d_pbase
= lp
->d_bbase
+ ((32768 + blkmask
) & ~blkmask
);
434 lp
->d_pstop
= (lp
->d_total_size
- lp
->d_bbase
) & ~blkmask
;
435 lp
->d_abase
= lp
->d_pstop
;
438 * All partitions are left empty unless DSO_COMPATPARTA is set
441 if (info
->d_dsflags
& DSO_COMPATPARTA
) {
442 pp
= &lp
->d_partitions
[0];
443 pp
->p_boffset
= lp
->d_pbase
;
444 pp
->p_bsize
= lp
->d_pstop
- lp
->d_pbase
;
445 /* XXX SET FS TYPE */
448 lpcrcsize
= offsetof(struct disklabel64
,
449 d_partitions
[lp
->d_npartitions
]) -
450 offsetof(struct disklabel64
, d_magic
);
451 lp
->d_crc
= crc32(&lp
->d_magic
, lpcrcsize
);
455 * Set the number of blocks at the beginning of the slice which have
456 * been reserved for label operations. This area will be write-protected
457 * when accessed via the slice.
459 * For now just protect the label area proper. Do not protect the
460 * boot area. Note partitions in 64 bit disklabels do not overlap
461 * the disklabel or boot area.
464 l64_adjust_label_reserved(struct diskslices
*ssp
, int slice
,
465 struct diskslice
*sp
)
467 struct disklabel64
*lp
= sp
->ds_label
.lab64
;
469 sp
->ds_reserved
= lp
->d_bbase
/ ssp
->dss_secsize
;
472 struct disklabel_ops disklabel64_ops
= {
473 .labelsize
= sizeof(struct disklabel64
),
474 .op_readdisklabel
= l64_readdisklabel
,
475 .op_setdisklabel
= l64_setdisklabel
,
476 .op_writedisklabel
= l64_writedisklabel
,
477 .op_clone_label
= l64_clone_label
,
478 .op_adjust_label_reserved
= l64_adjust_label_reserved
,
479 .op_getpartbounds
= l64_getpartbounds
,
480 .op_loadpartinfo
= l64_loadpartinfo
,
481 .op_getnumparts
= l64_getnumparts
,
482 .op_makevirginlabel
= l64_makevirginlabel