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subr_diskslice.c
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Mon Nov 10 06:12:13 2003 UTC (9 years, 7 months ago) by
dillon
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Fully synchronize sys/boot from FreeBSD-5.x, but add / to the module path
so /kernel will be found and loaded instead of /boot/kernel. This will
give us all the capabilities of the FreeBSD-5 boot code including AMD64 and
ELF64 support.
As part of this work, rather then try to adjust ufs/fs.h and friends to get
UFS2 info I instead copied the fs.h and friends from FreeBSD-5 into the
sys/boot subtree
Additionally, import Peter Wemm's linker set improvements from FreeBSD-5.x.
They happen to be compatible with GCC 2.95.x and it allows very few changes
to be made to the boot code.
Additionally import a number of other elements from FreeBSD-5 including
sys/diskmbr.h separation.
1: /*-
2: * Copyright (c) 1994 Bruce D. Evans.
3: * All rights reserved.
4: *
5: * Copyright (c) 1990 The Regents of the University of California.
6: * All rights reserved.
7: *
8: * This code is derived from software contributed to Berkeley by
9: * William Jolitz.
10: *
11: * Copyright (c) 1982, 1986, 1988 Regents of the University of California.
12: * All rights reserved.
13: *
14: * Redistribution and use in source and binary forms, with or without
15: * modification, are permitted provided that the following conditions
16: * are met:
17: * 1. Redistributions of source code must retain the above copyright
18: * notice, this list of conditions and the following disclaimer.
19: * 2. Redistributions in binary form must reproduce the above copyright
20: * notice, this list of conditions and the following disclaimer in the
21: * documentation and/or other materials provided with the distribution.
22: * 3. All advertising materials mentioning features or use of this software
23: * must display the following acknowledgement:
24: * This product includes software developed by the University of
25: * California, Berkeley and its contributors.
26: * 4. Neither the name of the University nor the names of its contributors
27: * may be used to endorse or promote products derived from this software
28: * without specific prior written permission.
29: *
30: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
31: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
32: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
33: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
34: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
35: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
36: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
37: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
38: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
39: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
40: * SUCH DAMAGE.
41: *
42: * from: @(#)wd.c 7.2 (Berkeley) 5/9/91
43: * from: wd.c,v 1.55 1994/10/22 01:57:12 phk Exp $
44: * from: @(#)ufs_disksubr.c 7.16 (Berkeley) 5/4/91
45: * from: ufs_disksubr.c,v 1.8 1994/06/07 01:21:39 phk Exp $
46: * $FreeBSD: src/sys/kern/subr_diskslice.c,v 1.82.2.6 2001/07/24 09:49:41 dd Exp $
47: * $DragonFly: src/sys/kern/subr_diskslice.c,v 1.7 2003/11/10 06:12:13 dillon Exp $
48: */
49:
50: #include <sys/param.h>
51: #include <sys/systm.h>
52: #include <sys/buf.h>
53: #include <sys/conf.h>
54: #include <sys/disklabel.h>
55: #include <sys/diskslice.h>
56: #include <sys/diskmbr.h>
57: #include <sys/fcntl.h>
58: #include <sys/malloc.h>
59: #include <sys/stat.h>
60: #include <sys/syslog.h>
61: #include <sys/vnode.h>
62: #include <sys/device.h>
63:
64: #include <vfs/ufs/fs.h>
65:
66: #define TRACE(str) do { if (ds_debug) printf str; } while (0)
67:
68: typedef u_char bool_t;
69:
70: static volatile bool_t ds_debug;
71:
72: static struct disklabel *clone_label (struct disklabel *lp);
73: static void dsiodone (struct buf *bp);
74: static char *fixlabel (char *sname, struct diskslice *sp,
75: struct disklabel *lp, int writeflag);
76: static void free_ds_label (struct diskslices *ssp, int slice);
77: static void partition_info (char *sname, int part, struct partition *pp);
78: static void slice_info (char *sname, struct diskslice *sp);
79: static void set_ds_label (struct diskslices *ssp, int slice,
80: struct disklabel *lp);
81: static void set_ds_labeldevs (dev_t dev, struct diskslices *ssp);
82: static void set_ds_wlabel (struct diskslices *ssp, int slice,
83: int wlabel);
84:
85: /*
86: * Duplicate a label for the whole disk, and initialize defaults in the
87: * copy for fields that are not already initialized. The caller only
88: * needs to initialize d_secsize and d_secperunit, and zero the fields
89: * that are to be defaulted.
90: */
91: static struct disklabel *
92: clone_label(lp)
93: struct disklabel *lp;
94: {
95: struct disklabel *lp1;
96:
97: lp1 = malloc(sizeof *lp1, M_DEVBUF, M_WAITOK);
98: *lp1 = *lp;
99: lp = NULL;
100: if (lp1->d_typename[0] == '\0')
101: strncpy(lp1->d_typename, "amnesiac", sizeof(lp1->d_typename));
102: if (lp1->d_packname[0] == '\0')
103: strncpy(lp1->d_packname, "fictitious", sizeof(lp1->d_packname));
104: if (lp1->d_nsectors == 0)
105: lp1->d_nsectors = 32;
106: if (lp1->d_ntracks == 0)
107: lp1->d_ntracks = 64;
108: lp1->d_secpercyl = lp1->d_nsectors * lp1->d_ntracks;
109: lp1->d_ncylinders = lp1->d_secperunit / lp1->d_secpercyl;
110: if (lp1->d_rpm == 0)
111: lp1->d_rpm = 3600;
112: if (lp1->d_interleave == 0)
113: lp1->d_interleave = 1;
114: if (lp1->d_npartitions < RAW_PART + 1)
115: lp1->d_npartitions = MAXPARTITIONS;
116: if (lp1->d_bbsize == 0)
117: lp1->d_bbsize = BBSIZE;
118: if (lp1->d_sbsize == 0)
119: lp1->d_sbsize = SBSIZE;
120: lp1->d_partitions[RAW_PART].p_size = lp1->d_secperunit;
121: lp1->d_magic = DISKMAGIC;
122: lp1->d_magic2 = DISKMAGIC;
123: lp1->d_checksum = dkcksum(lp1);
124: return (lp1);
125: }
126:
127: /*
128: * Determine the size of the transfer, and make sure it is
129: * within the boundaries of the partition. Adjust transfer
130: * if needed, and signal errors or early completion.
131: *
132: * XXX TODO:
133: * o Split buffers that are too big for the device.
134: * o Check for overflow.
135: * o Finish cleaning this up.
136: */
137: int
138: dscheck(bp, ssp)
139: struct buf *bp;
140: struct diskslices *ssp;
141: {
142: daddr_t blkno;
143: u_long endsecno;
144: daddr_t labelsect;
145: struct disklabel *lp;
146: char *msg;
147: long nsec;
148: struct partition *pp;
149: daddr_t secno;
150: daddr_t slicerel_secno;
151: struct diskslice *sp;
152: int s;
153:
154: blkno = bp->b_blkno;
155: if (blkno < 0) {
156: printf("dscheck(%s): negative b_blkno %ld\n",
157: devtoname(bp->b_dev), (long)blkno);
158: bp->b_error = EINVAL;
159: goto bad;
160: }
161: sp = &ssp->dss_slices[dkslice(bp->b_dev)];
162: lp = sp->ds_label;
163: if (ssp->dss_secmult == 1) {
164: if (bp->b_bcount % (u_long)DEV_BSIZE)
165: goto bad_bcount;
166: secno = blkno;
167: nsec = bp->b_bcount >> DEV_BSHIFT;
168: } else if (ssp->dss_secshift != -1) {
169: if (bp->b_bcount & (ssp->dss_secsize - 1))
170: goto bad_bcount;
171: if (blkno & (ssp->dss_secmult - 1))
172: goto bad_blkno;
173: secno = blkno >> ssp->dss_secshift;
174: nsec = bp->b_bcount >> (DEV_BSHIFT + ssp->dss_secshift);
175: } else {
176: if (bp->b_bcount % ssp->dss_secsize)
177: goto bad_bcount;
178: if (blkno % ssp->dss_secmult)
179: goto bad_blkno;
180: secno = blkno / ssp->dss_secmult;
181: nsec = bp->b_bcount / ssp->dss_secsize;
182: }
183: if (lp == NULL) {
184: labelsect = -LABELSECTOR - 1;
185: endsecno = sp->ds_size;
186: slicerel_secno = secno;
187: } else {
188: labelsect = lp->d_partitions[LABEL_PART].p_offset;
189: if (labelsect != 0) Debugger("labelsect != 0 in dscheck()");
190: pp = &lp->d_partitions[dkpart(bp->b_dev)];
191: endsecno = pp->p_size;
192: slicerel_secno = pp->p_offset + secno;
193: }
194:
195: /* overwriting disk label ? */
196: /* XXX should also protect bootstrap in first 8K */
197: if (slicerel_secno <= LABELSECTOR + labelsect &&
198: #if LABELSECTOR != 0
199: slicerel_secno + nsec > LABELSECTOR + labelsect &&
200: #endif
201: (bp->b_flags & B_READ) == 0 && sp->ds_wlabel == 0) {
202: bp->b_error = EROFS;
203: goto bad;
204: }
205:
206: #if defined(DOSBBSECTOR) && defined(notyet)
207: /* overwriting master boot record? */
208: if (slicerel_secno <= DOSBBSECTOR && (bp->b_flags & B_READ) == 0 &&
209: sp->ds_wlabel == 0) {
210: bp->b_error = EROFS;
211: goto bad;
212: }
213: #endif
214:
215: /* beyond partition? */
216: if (secno + nsec > endsecno) {
217: /* if exactly at end of disk, return an EOF */
218: if (secno == endsecno) {
219: bp->b_resid = bp->b_bcount;
220: return (0);
221: }
222: /* or truncate if part of it fits */
223: nsec = endsecno - secno;
224: if (nsec <= 0) {
225: bp->b_error = EINVAL;
226: goto bad;
227: }
228: bp->b_bcount = nsec * ssp->dss_secsize;
229: }
230:
231: bp->b_pblkno = sp->ds_offset + slicerel_secno;
232:
233: /*
234: * Snoop on label accesses if the slice offset is nonzero. Fudge
235: * offsets in the label to keep the in-core label coherent with
236: * the on-disk one.
237: */
238: if (slicerel_secno <= LABELSECTOR + labelsect
239: #if LABELSECTOR != 0
240: && slicerel_secno + nsec > LABELSECTOR + labelsect
241: #endif
242: && sp->ds_offset != 0) {
243: struct iodone_chain *ic;
244:
245: ic = malloc(sizeof *ic , M_DEVBUF, M_WAITOK);
246: ic->ic_prev_flags = bp->b_flags;
247: ic->ic_prev_iodone = bp->b_iodone;
248: ic->ic_prev_iodone_chain = bp->b_iodone_chain;
249: ic->ic_args[0].ia_long = (LABELSECTOR + labelsect -
250: slicerel_secno) * ssp->dss_secsize;
251: ic->ic_args[1].ia_ptr = sp;
252: bp->b_flags |= B_CALL;
253: bp->b_iodone = dsiodone;
254: bp->b_iodone_chain = ic;
255: if (!(bp->b_flags & B_READ)) {
256: /*
257: * XXX even disklabel(8) writes directly so we need
258: * to adjust writes. Perhaps we should drop support
259: * for DIOCWLABEL (always write protect labels) and
260: * require the use of DIOCWDINFO.
261: *
262: * XXX probably need to copy the data to avoid even
263: * temporarily corrupting the in-core copy.
264: */
265: if (bp->b_vp != NULL) {
266: s = splbio();
267: bp->b_vp->v_numoutput++;
268: splx(s);
269: }
270: /* XXX need name here. */
271: msg = fixlabel((char *)NULL, sp,
272: (struct disklabel *)
273: (bp->b_data + ic->ic_args[0].ia_long),
274: TRUE);
275: if (msg != NULL) {
276: printf("dscheck(%s): %s\n",
277: devtoname(bp->b_dev), msg);
278: bp->b_error = EROFS;
279: goto bad;
280: }
281: }
282: }
283: return (1);
284:
285: bad_bcount:
286: printf(
287: "dscheck(%s): b_bcount %ld is not on a sector boundary (ssize %d)\n",
288: devtoname(bp->b_dev), bp->b_bcount, ssp->dss_secsize);
289: bp->b_error = EINVAL;
290: goto bad;
291:
292: bad_blkno:
293: printf(
294: "dscheck(%s): b_blkno %ld is not on a sector boundary (ssize %d)\n",
295: devtoname(bp->b_dev), (long)blkno, ssp->dss_secsize);
296: bp->b_error = EINVAL;
297: goto bad;
298:
299: bad:
300: bp->b_resid = bp->b_bcount;
301: bp->b_flags |= B_ERROR;
302: return (-1);
303: }
304:
305: void
306: dsclose(dev, mode, ssp)
307: dev_t dev;
308: int mode;
309: struct diskslices *ssp;
310: {
311: u_char mask;
312: struct diskslice *sp;
313:
314: sp = &ssp->dss_slices[dkslice(dev)];
315: mask = 1 << dkpart(dev);
316: sp->ds_openmask &= ~mask;
317: }
318:
319: void
320: dsgone(sspp)
321: struct diskslices **sspp;
322: {
323: int slice;
324: struct diskslice *sp;
325: struct diskslices *ssp;
326:
327: for (slice = 0, ssp = *sspp; slice < ssp->dss_nslices; slice++) {
328: sp = &ssp->dss_slices[slice];
329: free_ds_label(ssp, slice);
330: }
331: free(ssp, M_DEVBUF);
332: *sspp = NULL;
333: }
334:
335: /*
336: * For the "write" commands (DIOCSDINFO and DIOCWDINFO), this
337: * is subject to the same restriction as dsopen().
338: */
339: int
340: dsioctl(dev, cmd, data, flags, sspp)
341: dev_t dev;
342: u_long cmd;
343: caddr_t data;
344: int flags;
345: struct diskslices **sspp;
346: {
347: int error;
348: struct disklabel *lp;
349: int old_wlabel;
350: u_char openmask;
351: int part;
352: int slice;
353: struct diskslice *sp;
354: struct diskslices *ssp;
355: struct partition *pp;
356:
357: slice = dkslice(dev);
358: ssp = *sspp;
359: sp = &ssp->dss_slices[slice];
360: lp = sp->ds_label;
361: switch (cmd) {
362:
363: case DIOCGDVIRGIN:
364: lp = (struct disklabel *)data;
365: if (ssp->dss_slices[WHOLE_DISK_SLICE].ds_label) {
366: *lp = *ssp->dss_slices[WHOLE_DISK_SLICE].ds_label;
367: } else {
368: bzero(lp, sizeof(struct disklabel));
369: }
370:
371: lp->d_magic = DISKMAGIC;
372: lp->d_magic2 = DISKMAGIC;
373: pp = &lp->d_partitions[RAW_PART];
374: pp->p_offset = 0;
375: pp->p_size = sp->ds_size;
376:
377: lp->d_npartitions = MAXPARTITIONS;
378: if (lp->d_interleave == 0)
379: lp->d_interleave = 1;
380: if (lp->d_rpm == 0)
381: lp->d_rpm = 3600;
382: if (lp->d_nsectors == 0)
383: lp->d_nsectors = 32;
384: if (lp->d_ntracks == 0)
385: lp->d_ntracks = 64;
386:
387: lp->d_bbsize = BBSIZE;
388: lp->d_sbsize = SBSIZE;
389: lp->d_secpercyl = lp->d_nsectors * lp->d_ntracks;
390: lp->d_ncylinders = sp->ds_size / lp->d_secpercyl;
391: lp->d_secperunit = sp->ds_size;
392: lp->d_checksum = 0;
393: lp->d_checksum = dkcksum(lp);
394: return (0);
395:
396: case DIOCGDINFO:
397: if (lp == NULL)
398: return (EINVAL);
399: *(struct disklabel *)data = *lp;
400: return (0);
401:
402: #ifdef notyet
403: case DIOCGDINFOP:
404: if (lp == NULL)
405: return (EINVAL);
406: *(struct disklabel **)data = lp;
407: return (0);
408: #endif
409:
410: case DIOCGPART:
411: if (lp == NULL)
412: return (EINVAL);
413: ((struct partinfo *)data)->disklab = lp;
414: ((struct partinfo *)data)->part
415: = &lp->d_partitions[dkpart(dev)];
416: return (0);
417:
418: case DIOCGSLICEINFO:
419: bcopy(ssp, data, (char *)&ssp->dss_slices[ssp->dss_nslices] -
420: (char *)ssp);
421: return (0);
422:
423: case DIOCSDINFO:
424: if (slice == WHOLE_DISK_SLICE)
425: return (ENODEV);
426: if (!(flags & FWRITE))
427: return (EBADF);
428: lp = malloc(sizeof *lp, M_DEVBUF, M_WAITOK);
429: if (sp->ds_label == NULL)
430: bzero(lp, sizeof *lp);
431: else
432: bcopy(sp->ds_label, lp, sizeof *lp);
433: if (sp->ds_label == NULL)
434: openmask = 0;
435: else {
436: openmask = sp->ds_openmask;
437: if (slice == COMPATIBILITY_SLICE)
438: openmask |= ssp->dss_slices[
439: ssp->dss_first_bsd_slice].ds_openmask;
440: else if (slice == ssp->dss_first_bsd_slice)
441: openmask |= ssp->dss_slices[
442: COMPATIBILITY_SLICE].ds_openmask;
443: }
444: error = setdisklabel(lp, (struct disklabel *)data,
445: (u_long)openmask);
446: /* XXX why doesn't setdisklabel() check this? */
447: if (error == 0 && lp->d_partitions[RAW_PART].p_offset != 0)
448: error = EXDEV;
449: if (error == 0) {
450: if (lp->d_secperunit > sp->ds_size)
451: error = ENOSPC;
452: for (part = 0; part < lp->d_npartitions; part++)
453: if (lp->d_partitions[part].p_size > sp->ds_size)
454: error = ENOSPC;
455: }
456: if (error != 0) {
457: free(lp, M_DEVBUF);
458: return (error);
459: }
460: free_ds_label(ssp, slice);
461: set_ds_label(ssp, slice, lp);
462: set_ds_labeldevs(dev, ssp);
463: return (0);
464:
465: case DIOCSYNCSLICEINFO:
466: if (slice != WHOLE_DISK_SLICE || dkpart(dev) != RAW_PART)
467: return (EINVAL);
468: if (!*(int *)data)
469: for (slice = 0; slice < ssp->dss_nslices; slice++) {
470: openmask = ssp->dss_slices[slice].ds_openmask;
471: if (openmask
472: && (slice != WHOLE_DISK_SLICE
473: || openmask & ~(1 << RAW_PART)))
474: return (EBUSY);
475: }
476:
477: /*
478: * Temporarily forget the current slices struct and read
479: * the current one.
480: * XXX should wait for current accesses on this disk to
481: * complete, then lock out future accesses and opens.
482: */
483: *sspp = NULL;
484: lp = malloc(sizeof *lp, M_DEVBUF, M_WAITOK);
485: *lp = *ssp->dss_slices[WHOLE_DISK_SLICE].ds_label;
486: error = dsopen(dev, S_IFCHR, ssp->dss_oflags, sspp, lp);
487: if (error != 0) {
488: free(lp, M_DEVBUF);
489: *sspp = ssp;
490: return (error);
491: }
492:
493: /*
494: * Reopen everything. This is a no-op except in the "force"
495: * case and when the raw bdev and cdev are both open. Abort
496: * if anything fails.
497: */
498: for (slice = 0; slice < ssp->dss_nslices; slice++) {
499: for (openmask = ssp->dss_slices[slice].ds_openmask,
500: part = 0; openmask; openmask >>= 1, part++) {
501: if (!(openmask & 1))
502: continue;
503: error = dsopen(dkmodslice(dkmodpart(dev, part),
504: slice),
505: S_IFCHR, ssp->dss_oflags, sspp,
506: lp);
507: if (error != 0) {
508: free(lp, M_DEVBUF);
509: *sspp = ssp;
510: return (EBUSY);
511: }
512: }
513: }
514:
515: free(lp, M_DEVBUF);
516: dsgone(&ssp);
517: return (0);
518:
519: case DIOCWDINFO:
520: error = dsioctl(dev, DIOCSDINFO, data, flags, &ssp);
521: if (error != 0)
522: return (error);
523: /*
524: * XXX this used to hack on dk_openpart to fake opening
525: * partition 0 in case that is used instead of dkpart(dev).
526: */
527: old_wlabel = sp->ds_wlabel;
528: set_ds_wlabel(ssp, slice, TRUE);
529: error = writedisklabel(dev, sp->ds_label);
530: /* XXX should invalidate in-core label if write failed. */
531: set_ds_wlabel(ssp, slice, old_wlabel);
532: return (error);
533:
534: case DIOCWLABEL:
535: #ifndef __alpha__
536: if (slice == WHOLE_DISK_SLICE)
537: return (ENODEV);
538: #endif
539: if (!(flags & FWRITE))
540: return (EBADF);
541: set_ds_wlabel(ssp, slice, *(int *)data != 0);
542: return (0);
543:
544: default:
545: return (ENOIOCTL);
546: }
547: }
548:
549: static void
550: dsiodone(bp)
551: struct buf *bp;
552: {
553: struct iodone_chain *ic;
554: char *msg;
555:
556: ic = bp->b_iodone_chain;
557: bp->b_flags = (ic->ic_prev_flags & B_CALL)
558: | (bp->b_flags & ~(B_CALL | B_DONE));
559: bp->b_iodone = ic->ic_prev_iodone;
560: bp->b_iodone_chain = ic->ic_prev_iodone_chain;
561: if (!(bp->b_flags & B_READ)
562: || (!(bp->b_flags & B_ERROR) && bp->b_error == 0)) {
563: msg = fixlabel((char *)NULL, ic->ic_args[1].ia_ptr,
564: (struct disklabel *)
565: (bp->b_data + ic->ic_args[0].ia_long),
566: FALSE);
567: if (msg != NULL)
568: printf("%s\n", msg);
569: }
570: free(ic, M_DEVBUF);
571: biodone(bp);
572: }
573:
574: int
575: dsisopen(ssp)
576: struct diskslices *ssp;
577: {
578: int slice;
579:
580: if (ssp == NULL)
581: return (0);
582: for (slice = 0; slice < ssp->dss_nslices; slice++)
583: if (ssp->dss_slices[slice].ds_openmask)
584: return (1);
585: return (0);
586: }
587:
588: /*
589: * Allocate a slices "struct" and initialize it to contain only an empty
590: * compatibility slice (pointing to itself), a whole disk slice (covering
591: * the disk as described by the label), and (nslices - BASE_SLICES) empty
592: * slices beginning at BASE_SLICE.
593: */
594: struct diskslices *
595: dsmakeslicestruct(nslices, lp)
596: int nslices;
597: struct disklabel *lp;
598: {
599: struct diskslice *sp;
600: struct diskslices *ssp;
601:
602: ssp = malloc(offsetof(struct diskslices, dss_slices) +
603: nslices * sizeof *sp, M_DEVBUF, M_WAITOK);
604: ssp->dss_first_bsd_slice = COMPATIBILITY_SLICE;
605: ssp->dss_nslices = nslices;
606: ssp->dss_oflags = 0;
607: ssp->dss_secmult = lp->d_secsize / DEV_BSIZE;
608: if (ssp->dss_secmult & (ssp->dss_secmult - 1))
609: ssp->dss_secshift = -1;
610: else
611: ssp->dss_secshift = ffs(ssp->dss_secmult) - 1;
612: ssp->dss_secsize = lp->d_secsize;
613: sp = &ssp->dss_slices[0];
614: bzero(sp, nslices * sizeof *sp);
615: sp[WHOLE_DISK_SLICE].ds_size = lp->d_secperunit;
616: return (ssp);
617: }
618:
619: char *
620: dsname(dev, unit, slice, part, partname)
621: dev_t dev;
622: int unit;
623: int slice;
624: int part;
625: char *partname;
626: {
627: static char name[32];
628: const char *dname;
629:
630: dname = dev_dname(dev);
631: if (strlen(dname) > 16)
632: dname = "nametoolong";
633: snprintf(name, sizeof(name), "%s%d", dname, unit);
634: partname[0] = '\0';
635: if (slice != WHOLE_DISK_SLICE || part != RAW_PART) {
636: partname[0] = 'a' + part;
637: partname[1] = '\0';
638: if (slice != COMPATIBILITY_SLICE)
639: snprintf(name + strlen(name),
640: sizeof(name) - strlen(name), "s%d", slice - 1);
641: }
642: return (name);
643: }
644:
645: /*
646: * This should only be called when the unit is inactive and the strategy
647: * routine should not allow it to become active unless we call it. Our
648: * strategy routine must be special to allow activity.
649: */
650: int
651: dsopen(dev, mode, flags, sspp, lp)
652: dev_t dev;
653: int mode;
654: u_int flags;
655: struct diskslices **sspp;
656: struct disklabel *lp;
657: {
658: dev_t dev1;
659: int error;
660: struct disklabel *lp1;
661: char *msg;
662: u_char mask;
663: bool_t need_init;
664: int part;
665: char partname[2];
666: int slice;
667: char *sname;
668: struct diskslice *sp;
669: struct diskslices *ssp;
670: int unit;
671:
672: dev->si_bsize_phys = lp->d_secsize;
673:
674: unit = dkunit(dev);
675: if (lp->d_secsize % DEV_BSIZE) {
676: printf("%s: invalid sector size %lu\n", devtoname(dev),
677: (u_long)lp->d_secsize);
678: return (EINVAL);
679: }
680:
681: /*
682: * XXX reinitialize the slice table unless there is an open device
683: * on the unit. This should only be done if the media has changed.
684: */
685: ssp = *sspp;
686: need_init = !dsisopen(ssp);
687: if (ssp != NULL && need_init)
688: dsgone(sspp);
689: if (need_init) {
690: /*
691: * Allocate a minimal slices "struct". This will become
692: * the final slices "struct" if we don't want real slices
693: * or if we can't find any real slices.
694: */
695: *sspp = dsmakeslicestruct(BASE_SLICE, lp);
696:
697: if (!(flags & DSO_ONESLICE)) {
698: TRACE(("dsinit\n"));
699: error = dsinit(dev, lp, sspp);
700: if (error != 0) {
701: dsgone(sspp);
702: return (error);
703: }
704: }
705: ssp = *sspp;
706: ssp->dss_oflags = flags;
707:
708: /*
709: * If there are no real slices, then make the compatiblity
710: * slice cover the whole disk.
711: */
712: if (ssp->dss_nslices == BASE_SLICE)
713: ssp->dss_slices[COMPATIBILITY_SLICE].ds_size
714: = lp->d_secperunit;
715:
716: /* Point the compatibility slice at the BSD slice, if any. */
717: for (slice = BASE_SLICE; slice < ssp->dss_nslices; slice++) {
718: sp = &ssp->dss_slices[slice];
719: if (sp->ds_type == DOSPTYP_386BSD /* XXX */) {
720: ssp->dss_first_bsd_slice = slice;
721: ssp->dss_slices[COMPATIBILITY_SLICE].ds_offset
722: = sp->ds_offset;
723: ssp->dss_slices[COMPATIBILITY_SLICE].ds_size
724: = sp->ds_size;
725: ssp->dss_slices[COMPATIBILITY_SLICE].ds_type
726: = sp->ds_type;
727: break;
728: }
729: }
730:
731: ssp->dss_slices[WHOLE_DISK_SLICE].ds_label = clone_label(lp);
732: ssp->dss_slices[WHOLE_DISK_SLICE].ds_wlabel = TRUE;
733: }
734:
735: /*
736: * Initialize secondary info for all slices. It is needed for more
737: * than the current slice in the DEVFS case. XXX DEVFS is no more.
738: */
739: for (slice = 0; slice < ssp->dss_nslices; slice++) {
740: sp = &ssp->dss_slices[slice];
741: if (sp->ds_label != NULL
742: #ifdef __alpha__
743: && slice != WHOLE_DISK_SLICE
744: #endif
745: )
746: continue;
747: dev1 = dkmodslice(dkmodpart(dev, RAW_PART), slice);
748: sname = dsname(dev, unit, slice, RAW_PART, partname);
749: /*
750: * XXX this should probably only be done for the need_init
751: * case, but there may be a problem with DIOCSYNCSLICEINFO.
752: */
753: set_ds_wlabel(ssp, slice, TRUE); /* XXX invert */
754: lp1 = clone_label(lp);
755: TRACE(("readdisklabel\n"));
756: if (flags & DSO_NOLABELS)
757: msg = NULL;
758: else {
759: msg = readdisklabel(dev1, lp1);
760:
761: /*
762: * readdisklabel() returns NULL for success, and an
763: * error string for failure.
764: *
765: * If there isn't a label on the disk, and if the
766: * DSO_COMPATLABEL is set, we want to use the
767: * faked-up label provided by the caller.
768: *
769: * So we set msg to NULL to indicate that there is
770: * no failure (since we have a faked-up label),
771: * free lp1, and then clone it again from lp.
772: * (In case readdisklabel() modified lp1.)
773: */
774: if (msg != NULL && (flags & DSO_COMPATLABEL)) {
775: msg = NULL;
776: free(lp1, M_DEVBUF);
777: lp1 = clone_label(lp);
778: }
779: }
780: if (msg == NULL)
781: msg = fixlabel(sname, sp, lp1, FALSE);
782: if (msg == NULL && lp1->d_secsize != ssp->dss_secsize)
783: msg = "inconsistent sector size";
784: if (msg != NULL) {
785: if (sp->ds_type == DOSPTYP_386BSD /* XXX */)
786: log(LOG_WARNING, "%s: cannot find label (%s)\n",
787: sname, msg);
788: free(lp1, M_DEVBUF);
789: continue;
790: }
791: if (lp1->d_flags & D_BADSECT) {
792: log(LOG_ERR, "%s: bad sector table not supported\n",
793: sname);
794: free(lp1, M_DEVBUF);
795: continue;
796: }
797: set_ds_label(ssp, slice, lp1);
798: set_ds_labeldevs(dev1, ssp);
799: set_ds_wlabel(ssp, slice, FALSE);
800: }
801:
802: slice = dkslice(dev);
803: if (slice >= ssp->dss_nslices)
804: return (ENXIO);
805: sp = &ssp->dss_slices[slice];
806: part = dkpart(dev);
807: if (part != RAW_PART
808: && (sp->ds_label == NULL || part >= sp->ds_label->d_npartitions))
809: return (EINVAL); /* XXX needs translation */
810: mask = 1 << part;
811: sp->ds_openmask |= mask;
812: return (0);
813: }
814:
815: int
816: dssize(dev, sspp)
817: dev_t dev;
818: struct diskslices **sspp;
819: {
820: struct disklabel *lp;
821: int part;
822: int slice;
823: struct diskslices *ssp;
824:
825: slice = dkslice(dev);
826: part = dkpart(dev);
827: ssp = *sspp;
828: if (ssp == NULL || slice >= ssp->dss_nslices
829: || !(ssp->dss_slices[slice].ds_openmask & (1 << part))) {
830: if (dev_dopen(dev, FREAD, S_IFCHR, NULL) != 0)
831: return (-1);
832: dev_dclose(dev, FREAD, S_IFCHR, NULL);
833: ssp = *sspp;
834: }
835: lp = ssp->dss_slices[slice].ds_label;
836: if (lp == NULL)
837: return (-1);
838: return ((int)lp->d_partitions[part].p_size);
839: }
840:
841: static void
842: free_ds_label(ssp, slice)
843: struct diskslices *ssp;
844: int slice;
845: {
846: struct disklabel *lp;
847: struct diskslice *sp;
848:
849: sp = &ssp->dss_slices[slice];
850: lp = sp->ds_label;
851: if (lp == NULL)
852: return;
853: free(lp, M_DEVBUF);
854: set_ds_label(ssp, slice, (struct disklabel *)NULL);
855: }
856:
857: static char *
858: fixlabel(sname, sp, lp, writeflag)
859: char *sname;
860: struct diskslice *sp;
861: struct disklabel *lp;
862: int writeflag;
863: {
864: u_long end;
865: u_long offset;
866: int part;
867: struct partition *pp;
868: u_long start;
869: bool_t warned;
870:
871: /* These errors "can't happen" so don't bother reporting details. */
872: if (lp->d_magic != DISKMAGIC || lp->d_magic2 != DISKMAGIC)
873: return ("fixlabel: invalid magic");
874: if (dkcksum(lp) != 0)
875: return ("fixlabel: invalid checksum");
876:
877: pp = &lp->d_partitions[RAW_PART];
878: if (writeflag) {
879: start = 0;
880: offset = sp->ds_offset;
881: } else {
882: start = sp->ds_offset;
883: offset = -sp->ds_offset;
884: }
885: if (pp->p_offset != start) {
886: if (sname != NULL) {
887: printf(
888: "%s: rejecting BSD label: raw partition offset != slice offset\n",
889: sname);
890: slice_info(sname, sp);
891: partition_info(sname, RAW_PART, pp);
892: }
893: return ("fixlabel: raw partition offset != slice offset");
894: }
895: if (pp->p_size != sp->ds_size) {
896: if (sname != NULL) {
897: printf("%s: raw partition size != slice size\n", sname);
898: slice_info(sname, sp);
899: partition_info(sname, RAW_PART, pp);
900: }
901: if (pp->p_size > sp->ds_size) {
902: if (sname == NULL)
903: return ("fixlabel: raw partition size > slice size");
904: printf("%s: truncating raw partition\n", sname);
905: pp->p_size = sp->ds_size;
906: }
907: }
908: end = start + sp->ds_size;
909: if (start > end)
910: return ("fixlabel: slice wraps");
911: if (lp->d_secpercyl <= 0)
912: return ("fixlabel: d_secpercyl <= 0");
913: pp -= RAW_PART;
914: warned = FALSE;
915: for (part = 0; part < lp->d_npartitions; part++, pp++) {
916: if (pp->p_offset != 0 || pp->p_size != 0) {
917: if (pp->p_offset < start
918: || pp->p_offset + pp->p_size > end
919: || pp->p_offset + pp->p_size < pp->p_offset) {
920: if (sname != NULL) {
921: printf(
922: "%s: rejecting partition in BSD label: it isn't entirely within the slice\n",
923: sname);
924: if (!warned) {
925: slice_info(sname, sp);
926: warned = TRUE;
927: }
928: partition_info(sname, part, pp);
929: }
930: /* XXX else silently discard junk. */
931: bzero(pp, sizeof *pp);
932: } else
933: pp->p_offset += offset;
934: }
935: }
936: lp->d_ncylinders = sp->ds_size / lp->d_secpercyl;
937: lp->d_secperunit = sp->ds_size;
938: lp->d_checksum = 0;
939: lp->d_checksum = dkcksum(lp);
940: return (NULL);
941: }
942:
943: static void
944: partition_info(sname, part, pp)
945: char *sname;
946: int part;
947: struct partition *pp;
948: {
949: printf("%s%c: start %lu, end %lu, size %lu\n", sname, 'a' + part,
950: (u_long)pp->p_offset, (u_long)(pp->p_offset + pp->p_size - 1),
951: (u_long)pp->p_size);
952: }
953:
954: static void
955: slice_info(sname, sp)
956: char *sname;
957: struct diskslice *sp;
958: {
959: printf("%s: start %lu, end %lu, size %lu\n", sname,
960: sp->ds_offset, sp->ds_offset + sp->ds_size - 1, sp->ds_size);
961: }
962:
963: static void
964: set_ds_label(ssp, slice, lp)
965: struct diskslices *ssp;
966: int slice;
967: struct disklabel *lp;
968: {
969: ssp->dss_slices[slice].ds_label = lp;
970: if (slice == COMPATIBILITY_SLICE)
971: ssp->dss_slices[ssp->dss_first_bsd_slice].ds_label = lp;
972: else if (slice == ssp->dss_first_bsd_slice)
973: ssp->dss_slices[COMPATIBILITY_SLICE].ds_label = lp;
974: }
975:
976: /* XXX remove this? */
977: static void
978: set_ds_labeldevs(dev, ssp)
979: dev_t dev;
980: struct diskslices *ssp;
981: {
982: }
983:
984: static void
985: set_ds_wlabel(ssp, slice, wlabel)
986: struct diskslices *ssp;
987: int slice;
988: int wlabel;
989: {
990: ssp->dss_slices[slice].ds_wlabel = wlabel;
991: if (slice == COMPATIBILITY_SLICE)
992: ssp->dss_slices[ssp->dss_first_bsd_slice].ds_wlabel = wlabel;
993: else if (slice == ssp->dss_first_bsd_slice)
994: ssp->dss_slices[COMPATIBILITY_SLICE].ds_wlabel = wlabel;
995: }
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