Annotation of sys/arch/mac68k/mac68k/disksubr.c, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: disksubr.c,v 1.51 2007/07/11 04:53:42 miod Exp $ */
2: /* $NetBSD: disksubr.c,v 1.22 1997/11/26 04:18:20 briggs Exp $ */
3:
4: /*
5: * Copyright (c) 1982, 1986, 1988 Regents of the University of California.
6: * All rights reserved.
7: *
8: * Redistribution and use in source and binary forms, with or without
9: * modification, are permitted provided that the following conditions
10: * are met:
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 the
15: * documentation and/or other materials provided with the distribution.
16: * 3. Neither the name of the University nor the names of its contributors
17: * may be used to endorse or promote products derived from this software
18: * without specific prior written permission.
19: *
20: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30: * SUCH DAMAGE.
31: */
32:
33: /*-
34: * Copyright (C) 1993 Allen K. Briggs, Chris P. Caputo,
35: * Michael L. Finch, Bradley A. Grantham, and
36: * Lawrence A. Kesteloot
37: * All rights reserved.
38: *
39: * Redistribution and use in source and binary forms, with or without
40: * modification, are permitted provided that the following conditions
41: * are met:
42: * 1. Redistributions of source code must retain the above copyright
43: * notice, this list of conditions and the following disclaimer.
44: * 2. Redistributions in binary form must reproduce the above copyright
45: * notice, this list of conditions and the following disclaimer in the
46: * documentation and/or other materials provided with the distribution.
47: * 3. All advertising materials mentioning features or use of this software
48: * must display the following acknowledgement:
49: * This product includes software developed by the Alice Group.
50: * 4. The names of the Alice Group or any of its members may not be used
51: * to endorse or promote products derived from this software without
52: * specific prior written permission.
53: *
54: * THIS SOFTWARE IS PROVIDED BY THE ALICE GROUP ``AS IS'' AND ANY EXPRESS OR
55: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
56: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
57: * IN NO EVENT SHALL THE ALICE GROUP BE LIABLE FOR ANY DIRECT, INDIRECT,
58: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
59: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
60: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
61: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
62: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
63: * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
64: *
65: */
66:
67: /* rewritten, 2-5-93 MLF */
68: /* it's a lot cleaner now, and adding support for new partition types
69: * isn't a bitch anymore
70: * known bugs:
71: * 1) when only an HFS_PART part exists on a drive it gets assigned to "B"
72: * this is because of line 623 of sd.c, I think this line should go.
73: * 2) /sbin/disklabel expects the whole disk to be in "D", we put it in
74: * "C" (I think) and we don't set that position in the disklabel structure
75: * as used. Again, not my fault.
76: */
77: #include <sys/param.h>
78: #include <sys/systm.h>
79: #include <sys/buf.h>
80: #include <sys/disk.h>
81: #include <sys/disklabel.h>
82: #include <sys/malloc.h>
83: #include <sys/syslog.h>
84:
85: #include <mac68k/mac68k/dpme.h> /* MF the structure of a mac partition entry */
86:
87: #define NUM_PARTS_PROBED 32
88:
89: #define ROOT_PART 1
90: #define UFS_PART 2
91: #define SWAP_PART 3
92: #define HFS_PART 4
93: #define SCRATCH_PART 5
94:
95: int getFreeLabelEntry(struct disklabel *);
96: int whichType(struct partmapentry *);
97: int fixPartTable(struct partmapentry *, long, char *);
98: void setPart(struct partmapentry *, struct disklabel *, int, int);
99: int getNamedType(struct partmapentry *, int, struct disklabel *, int, int, int *);
100: char *read_mac_label(char *, struct disklabel *);
101:
102: /*
103: * Find an entry in the disk label that is unused and return it
104: * or -1 if no entry
105: */
106: int
107: getFreeLabelEntry(struct disklabel *lp)
108: {
109: int i;
110:
111: for (i = 0; i < MAXPARTITIONS; i++) {
112: if (i != RAW_PART &&
113: lp->d_partitions[i].p_fstype == FS_UNUSED)
114: return i;
115: }
116: return -1;
117: }
118:
119: /*
120: * figure out what the type of the given part is and return it
121: */
122: int
123: whichType(struct partmapentry *part)
124: {
125: struct blockzeroblock *bzb;
126:
127: if (part->pmPartType[0] == '\0')
128: return 0;
129:
130: if (strcmp(PART_DRIVER_TYPE, (char *)part->pmPartType) == 0 ||
131: strcmp(PART_DRIVER43_TYPE, (char *)part->pmPartType) == 0 ||
132: strcmp(PART_DRIVERATA_TYPE, (char *)part->pmPartType) == 0 ||
133: strcmp(PART_FWB_COMPONENT_TYPE, (char *)part->pmPartType) == 0 ||
134: strcmp(PART_PARTMAP_TYPE, (char *)part->pmPartType) == 0)
135: return 0;
136: if (strcmp(PART_UNIX_TYPE, (char *)part->pmPartType) == 0) {
137: /* unix part, swap, root, usr */
138: bzb = (struct blockzeroblock *)(&part->pmBootArgs);
139: if (bzb->bzbMagic != BZB_MAGIC)
140: return 0;
141:
142: if (bzb->bzbFlags & BZB_ROOTFS)
143: return ROOT_PART;
144:
145: if ((bzb->bzbFlags & BZB_USRFS) ||
146: (bzb->bzbFlags & BZB_EXFS4) ||
147: (bzb->bzbFlags & BZB_EXFS5) ||
148: (bzb->bzbFlags & BZB_EXFS6))
149: return UFS_PART;
150:
151: if (bzb->bzbType == BZB_TYPESWAP)
152: return SWAP_PART;
153:
154: return SCRATCH_PART;
155: }
156: if (strcmp(PART_MAC_TYPE, (char *)part->pmPartType) == 0)
157: return HFS_PART;
158: /*
159: if (strcmp(PART_SCRATCH, (char *)part->pmPartType) == 0)
160: return SCRATCH_PART;
161: */
162: return SCRATCH_PART; /* no known type, but label it, anyway */
163: }
164:
165: /*
166: * Take part table in crappy form, place it in a structure we can depend
167: * upon. Make sure names are NUL terminated. Capitalize the names
168: * of part types.
169: */
170: int
171: fixPartTable(struct partmapentry *partTable, long size, char *base)
172: {
173: struct partmapentry *pmap;
174: char *s;
175: int i;
176:
177: for (i = 0; i < NUM_PARTS_PROBED; i++) {
178: pmap = (struct partmapentry *)((i * size) + base + DEV_BSIZE);
179: partTable[i] = *pmap;
180: pmap = &partTable[i];
181:
182: if (pmap->pmSig != DPME_MAGIC) { /* this is not valid */
183: pmap->pmPartType[0] = '\0';
184: return i;
185: }
186:
187: pmap->pmPartName[31] = '\0';
188: pmap->pmPartType[31] = '\0';
189:
190: for (s = pmap->pmPartType; *s; s++)
191: if ((*s >= 'a') && (*s <= 'z'))
192: *s = (*s - 'a' + 'A');
193: }
194: return NUM_PARTS_PROBED;
195: }
196:
197: void
198: setPart(struct partmapentry *part, struct disklabel *lp, int fstype, int slot)
199: {
200: DL_SETPSIZE(&lp->d_partitions[slot], part->pmPartBlkCnt);
201: DL_SETPOFFSET(&lp->d_partitions[slot], part->pmPyPartStart);
202: lp->d_partitions[slot].p_fstype = fstype;
203: part->pmPartType[0] = '\0';
204: }
205:
206: int
207: getNamedType(struct partmapentry *part, int num_parts, struct disklabel *lp,
208: int type, int alt, int *maxslot)
209: {
210: struct blockzeroblock *bzb;
211: int i;
212:
213: for (i = 0; i < num_parts; i++) {
214: if (whichType(&(part[i])) == type) {
215: switch (type) {
216: case ROOT_PART:
217: bzb = (struct blockzeroblock *)
218: (&part[i].pmBootArgs);
219: if (alt >= 0 && alt != bzb->bzbCluster)
220: goto skip;
221: setPart(&(part[i]), lp, FS_BSDFFS, 0);
222: break;
223: case UFS_PART:
224: bzb = (struct blockzeroblock *)
225: (&part[i].pmBootArgs);
226: if (alt >= 0 && alt != bzb->bzbCluster)
227: goto skip;
228: setPart(&(part[i]), lp, FS_BSDFFS, 6);
229: if (*maxslot < 6)
230: *maxslot = 6;
231: break;
232: case SWAP_PART:
233: setPart(&(part[i]), lp, FS_SWAP, 1);
234: if (*maxslot < 1)
235: *maxslot = 1;
236: break;
237: default:
238: printf("disksubr.c: can't do type %d\n", type);
239: break;
240: }
241: return 0;
242: }
243: skip:
244: }
245: return -1;
246: }
247:
248: /*
249: * read in the entire diskpartition table, it may be bigger or smaller
250: * than NUM_PARTS_PROBED but read that many entries. Each entry has a magic
251: * number so we'll know if an entry is crap.
252: * next fill in the disklabel with info like this
253: * next fill in the root, usr, and swap parts.
254: * then look for anything else and fit it in.
255: * A: root
256: * B: Swap
257: * C: Whole disk
258: *
259: * AKB -- I added to Mike's original algorithm by searching for a bzbCluster
260: * of zero for root, first. This allows A/UX to live on cluster 1 and
261: * NetBSD to live on cluster 0--regardless of the actual order on the
262: * disk. This whole algorithm should probably be changed in the future.
263: */
264: char *
265: read_mac_label(char *dlbuf, struct disklabel *lp)
266: {
267: int i, num_parts, maxslot = RAW_PART;
268: struct partmapentry *pmap;
269:
270: MALLOC(pmap, struct partmapentry *,
271: NUM_PARTS_PROBED * sizeof(struct partmapentry), M_DEVBUF, M_NOWAIT);
272: if (pmap == NULL)
273: return ("out of memory");
274:
275: num_parts = fixPartTable(pmap, lp->d_secsize, dlbuf);
276: if (getNamedType(pmap, num_parts, lp, ROOT_PART, 0, &maxslot))
277: getNamedType(pmap, num_parts, lp, ROOT_PART, -1, &maxslot);
278: getNamedType(pmap, num_parts, lp, SWAP_PART, -1, &maxslot);
279: if (getNamedType(pmap, num_parts, lp, UFS_PART, 0, &maxslot))
280: getNamedType(pmap, num_parts, lp, UFS_PART, -1, &maxslot);
281: for (i = 0; i < num_parts; i++) {
282: int partType, slot;
283:
284: slot = getFreeLabelEntry(lp);
285: if (slot < 0)
286: break;
287:
288: partType = whichType(&(pmap[i]));
289:
290: switch (partType) {
291: case ROOT_PART:
292: case UFS_PART:
293: setPart(&(pmap[i]), lp, FS_BSDFFS, slot);
294: if (slot > maxslot)
295: maxslot = slot;
296: break;
297: case SWAP_PART:
298: setPart(&(pmap[i]), lp, FS_SWAP, slot);
299: if (slot > maxslot)
300: maxslot = slot;
301: break;
302: case HFS_PART:
303: setPart(&(pmap[i]), lp, FS_HFS, slot);
304: if (slot > maxslot)
305: maxslot = slot;
306: break;
307: case SCRATCH_PART:
308: setPart(&(pmap[i]), lp, FS_OTHER, slot);
309: if (slot > maxslot)
310: maxslot = slot;
311: break;
312: default:
313: break;
314: }
315: }
316: lp->d_npartitions = maxslot + 1;
317: lp->d_version = 1;
318: lp->d_checksum = 0;
319: lp->d_checksum = dkcksum(lp);
320: FREE(pmap, M_DEVBUF);
321: return NULL;
322: }
323:
324: /*
325: * Attempt to read a disk label from a device using the indicated strategy
326: * routine. The label must be partly set up before this: secpercyl and
327: * anything required in the strategy routine (e.g., sector size) must be
328: * filled in before calling us. Returns null on success and an error
329: * string on failure.
330: */
331: char *
332: readdisklabel(dev_t dev, void (*strat)(struct buf *),
333: struct disklabel *lp, int spoofonly)
334: {
335: struct buf *bp = NULL;
336: u_int16_t *sbSigp;
337: int size;
338: char *msg;
339:
340: if ((msg = initdisklabel(lp)))
341: goto done;
342:
343: size = roundup((NUM_PARTS_PROBED + 1) << DEV_BSHIFT, lp->d_secsize);
344: bp = geteblk(size);
345: bp->b_dev = dev;
346:
347: if (spoofonly)
348: goto doslabel;
349:
350: bp->b_blkno = LABELSECTOR;
351: bp->b_bcount = size;
352: bp->b_flags = B_BUSY | B_READ;
353: (*strat)(bp);
354: if (biowait(bp)) {
355: msg = "disk label I/O error";
356: goto done;
357: }
358:
359: sbSigp = (u_int16_t *)bp->b_data;
360: if (*sbSigp == 0x4552) {
361: msg = read_mac_label(bp->b_data, lp);
362: if (msg == NULL)
363: goto done;
364: }
365:
366: /* Get a MI label */
367: bp->b_blkno = LABELSECTOR;
368: bp->b_bcount = lp->d_secsize;
369: bp->b_flags = B_BUSY | B_READ;
370: (*strat)(bp);
371: if (biowait(bp)) {
372: msg = "disk label I/O error";
373: goto done;
374: }
375:
376: msg = checkdisklabel(bp->b_data + LABELOFFSET, lp);
377: if (msg == NULL)
378: goto done;
379:
380: doslabel:
381: msg = readdoslabel(bp, strat, lp, NULL, spoofonly);
382: if (msg == NULL)
383: goto done;
384:
385: #if defined(CD9660)
386: if (iso_disklabelspoof(dev, strat, lp) == 0) {
387: msg = NULL;
388: goto done;
389: }
390: #endif
391: #if defined(UDF)
392: if (udf_disklabelspoof(dev, strat, lp) == 0) {
393: msg = NULL;
394: goto done;
395: }
396: #endif
397:
398: done:
399: if (bp) {
400: bp->b_flags |= B_INVAL;
401: brelse(bp);
402: }
403: return (msg);
404: }
405:
406: /*
407: * Write disk label back to device after modification.
408: *
409: * To avoid spreading havoc into the MacOS partition structures, we will
410: * refuse to write a disklabel if the media has a MacOS signature.
411: */
412: int
413: writedisklabel(dev_t dev, void (*strat)(struct buf *), struct disklabel *lp)
414: {
415: struct buf *bp = NULL;
416: struct disklabel *dlp;
417: int error = 0;
418: u_int16_t *sbSigp;
419:
420: /* get a buffer and initialize it */
421: bp = geteblk((int)lp->d_secsize);
422: bp->b_dev = dev;
423:
424: bp->b_blkno = LABELSECTOR;
425: bp->b_bcount = lp->d_secsize;
426: bp->b_flags = B_BUSY | B_READ;
427: (*strat)(bp);
428: if ((error = biowait(bp)) != 0)
429: goto done;
430:
431: /* Check for MacOS fingerprints */
432: sbSigp = (u_int16_t *)bp->b_data;
433: if (*sbSigp == 0x4552) {
434: /* XXX AND THEN DO NOT WRITE?? */
435: goto done;
436: }
437:
438: dlp = (struct disklabel *)(bp->b_data + LABELOFFSET);
439: *dlp = *lp;
440: bp->b_flags = B_BUSY | B_WRITE;
441: (*strat)(bp);
442: error = biowait(bp);
443:
444: done:
445: if (bp) {
446: bp->b_flags |= B_INVAL;
447: brelse(bp);
448: }
449: return (error);
450: }
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