Annotation of sys/arch/luna88k/luna88k/disksubr.c, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: disksubr.c,v 1.33 2007/06/20 18:15:45 deraadt Exp $ */
2: /* $NetBSD: disksubr.c,v 1.12 2002/02/19 17:09:44 wiz Exp $ */
3:
4: /*
5: * Copyright (c) 1994, 1995 Gordon W. Ross
6: * Copyright (c) 1994 Theo de Raadt
7: * Copyright (c) 1982, 1986, 1988 Regents of the University of California.
8: * All rights reserved.
9: *
10: * Redistribution and use in source and binary forms, with or without
11: * modification, are permitted provided that the following conditions
12: * are met:
13: * 1. Redistributions of source code must retain the above copyright
14: * notice, this list of conditions and the following disclaimer.
15: * 2. Redistributions in binary form must reproduce the above copyright
16: * notice, this list of conditions and the following disclaimer in the
17: * documentation and/or other materials provided with the distribution.
18: * 3. All advertising materials mentioning features or use of this software
19: * must display the following acknowledgement:
20: * This product includes software developed by the University of
21: * California, Berkeley and its contributors.
22: * 4. Neither the name of the University nor the names of its contributors
23: * may be used to endorse or promote products derived from this software
24: * without specific prior written permission.
25: *
26: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36: * SUCH DAMAGE.
37: */
38:
39: #include <sys/param.h>
40: #include <sys/systm.h>
41: #include <sys/buf.h>
42: #include <sys/device.h>
43: #include <sys/disklabel.h>
44: #include <sys/disk.h>
45:
46: #include <dev/sun/disklabel.h>
47:
48: /*
49: * UniOS disklabel (== ISI disklabel) is very similar to SunOS.
50: * SunOS UniOS/ISI
51: * text 128 128
52: * (pad) 292 294
53: * rpm 2 -
54: * pcyl 2 badchk 2
55: * sparecyl 2 maxblk 4
56: * (pad) 4 dtype 2
57: * interleave 2 ndisk 2
58: * ncyl 2 2
59: * acyl 2 2
60: * ntrack 2 2
61: * nsect 2 2
62: * (pad) 4 bhead 2
63: * - ppart 2
64: * dkpart[8] 64 64
65: * magic 2 2
66: * cksum 2 2
67: *
68: * Magic number value and checksum calculation are identical. Subtle
69: * difference is partition start address; UniOS/ISI maintains sector
70: * numbers while SunOS label has cylinder number.
71: *
72: * It is found that LUNA Mach2.5 has BSD label embedded at offset 64
73: * retaining UniOS/ISI label at the end of label block. LUNA Mach
74: * manipulates BSD disklabel in the same manner as 4.4BSD. It's
75: * uncertain LUNA Mach can create a disklabel on fresh disks since
76: * Mach writedisklabel logic seems to fail when no BSD label is found.
77: *
78: * Kernel handles disklabel in this way;
79: * - searchs BSD label at offset 64
80: * - if not found, searchs UniOS/ISI label at the end of block
81: * - kernel can distinguish whether it was SunOS label or UniOS/ISI
82: * label and understand both
83: * - kernel writes UniOS/ISI label combined with BSD label to update
84: * the label block
85: */
86:
87: #if LABELSECTOR != 0
88: #error "Default value of LABELSECTOR no longer zero?"
89: #endif
90:
91: char *disklabel_om_to_bsd(struct sun_disklabel *, struct disklabel *);
92: int disklabel_bsd_to_om(struct disklabel *, struct sun_disklabel *);
93:
94: /*
95: * Attempt to read a disk label from a device
96: * using the indicated strategy routine.
97: * The label must be partly set up before this:
98: * secpercyl, secsize and anything required for a block i/o read
99: * operation in the driver's strategy/start routines
100: * must be filled in before calling us.
101: *
102: * Return buffer for use in signalling errors if requested.
103: *
104: * Returns null on success and an error string on failure.
105: */
106: char *
107: readdisklabel(dev_t dev, void (*strat)(struct buf *),
108: struct disklabel *lp, int spoofonly)
109: {
110: struct sun_disklabel *slp;
111: struct buf *bp = NULL;
112: char *msg;
113:
114: if ((msg = initdisklabel(lp)))
115: goto done;
116:
117: /* get a buffer and initialize it */
118: bp = geteblk((int)lp->d_secsize);
119: bp->b_dev = dev;
120:
121: if (spoofonly)
122: goto done;
123:
124: bp->b_blkno = LABELSECTOR;
125: bp->b_cylinder = 0;
126: bp->b_bcount = lp->d_secsize;
127: bp->b_flags = B_BUSY | B_READ;
128: (*strat)(bp);
129: if (biowait(bp)) {
130: msg = "disk label read error";
131: goto done;
132: }
133:
134: slp = (struct sun_disklabel *)bp->b_data;
135: if (slp->sl_magic == SUN_DKMAGIC) {
136: msg = disklabel_om_to_bsd(slp, lp);
137: goto done;
138: }
139:
140: msg = checkdisklabel(bp->b_data + LABELOFFSET, lp);
141: if (msg == NULL)
142: goto done;
143:
144: #if defined(CD9660)
145: if (iso_disklabelspoof(dev, strat, lp) == 0) {
146: msg = NULL;
147: goto done;
148: }
149: #endif
150: #if defined(UDF)
151: if (udf_disklabelspoof(dev, strat, lp) == 0) {
152: msg = NULL;
153: goto done;
154: }
155: #endif
156:
157: done:
158: if (bp) {
159: bp->b_flags |= B_INVAL;
160: brelse(bp);
161: }
162: return (msg);
163: }
164:
165: /*
166: * Write disk label back to device after modification.
167: */
168: int
169: writedisklabel(dev_t dev, void (*strat)(struct buf *), struct disklabel *lp)
170: {
171: struct buf *bp = NULL;
172: int error;
173:
174: /* get a buffer and initialize it */
175: bp = geteblk((int)lp->d_secsize);
176: bp->b_dev = dev;
177:
178: /* Read the on disk label. */
179: bp->b_blkno = LABELSECTOR;
180: bp->b_cylinder = 0;
181: bp->b_bcount = lp->d_secsize;
182: bp->b_flags = B_BUSY | B_READ;
183:
184: (*strat)(bp);
185: error = biowait(bp);
186: if (error)
187: goto done;
188:
189: /* Write out the updated label. */
190: error = disklabel_bsd_to_om(lp, (struct sun_disklabel *)bp->b_data);
191: if (error)
192: goto done;
193:
194: bp->b_flags = B_BUSY | B_WRITE;
195: (*strat)(bp);
196: error = biowait(bp);
197:
198: done:
199: if (bp) {
200: bp->b_flags |= B_INVAL;
201: brelse(bp);
202: }
203: return (error);
204: }
205:
206: /************************************************************************
207: *
208: * The rest of this was taken from arch/sparc/scsi/sun_disklabel.c
209: * and then substantially rewritten by Gordon W. Ross
210: *
211: ************************************************************************/
212:
213: /* What partition types to assume for Sun disklabels: */
214: static const u_char
215: sun_fstypes[8] = {
216: FS_BSDFFS, /* a */
217: FS_SWAP, /* b */
218: FS_OTHER, /* c - whole disk */
219: FS_BSDFFS, /* d */
220: FS_BSDFFS, /* e */
221: FS_BSDFFS, /* f */
222: FS_BSDFFS, /* g */
223: FS_BSDFFS, /* h */
224: };
225:
226: /*
227: * Given a UniOS/ISI disk label, set lp to a BSD disk label.
228: * Returns NULL on success, else an error string.
229: *
230: * The BSD label is cleared out before this is called.
231: */
232: char *
233: disklabel_om_to_bsd(struct sun_disklabel *sl, struct disklabel *lp)
234: {
235: struct partition *npp;
236: struct sun_dkpart *spp;
237: int i, secpercyl;
238: u_short cksum = 0, *sp1, *sp2;
239:
240: /* Verify the XOR check. */
241: sp1 = (u_short *)sl;
242: sp2 = (u_short *)(sl + 1);
243: while (sp1 < sp2)
244: cksum ^= *sp1++;
245: if (cksum != 0)
246: return ("UniOS disk label, bad checksum");
247:
248: memset((caddr_t)lp, 0, sizeof(struct disklabel));
249: /* Format conversion. */
250: lp->d_magic = DISKMAGIC;
251: lp->d_magic2 = DISKMAGIC;
252: lp->d_flags = D_VENDOR;
253: memcpy(lp->d_packname, sl->sl_text, sizeof(lp->d_packname));
254:
255: lp->d_secsize = 512;
256: lp->d_nsectors = sl->sl_nsectors;
257: lp->d_ntracks = sl->sl_ntracks;
258: lp->d_ncylinders = sl->sl_ncylinders;
259:
260: secpercyl = sl->sl_nsectors * sl->sl_ntracks;
261: lp->d_secpercyl = secpercyl;
262: if (DL_GETDSIZE(lp) == 0)
263: DL_SETDSIZE(lp, (daddr64_t)secpercyl * sl->sl_ncylinders);
264: lp->d_version = 1;
265:
266: lp->d_sparespercyl = 0; /* no way to know */
267: lp->d_acylinders = sl->sl_acylinders;
268: lp->d_rpm = sl->sl_rpm; /* UniOS - (empty) */
269: lp->d_interleave = sl->sl_interleave; /* UniOS - ndisk */
270:
271: if (sl->sl_rpm == 0) {
272: /* UniOS label has blkoffset, not cyloffset */
273: secpercyl = 1;
274: }
275:
276: lp->d_npartitions = 8;
277: /* These are as defined in <ufs/ffs/fs.h> */
278: lp->d_bbsize = 8192; /* XXX */
279: lp->d_sbsize = 8192; /* XXX */
280:
281: for (i = 0; i < 8; i++) {
282: spp = &sl->sl_part[i];
283: npp = &lp->d_partitions[i];
284: DL_SETPOFFSET(npp, spp->sdkp_cyloffset * secpercyl);
285: DL_SETPSIZE(npp, spp->sdkp_nsectors);
286: if (DL_GETPSIZE(npp) == 0) {
287: npp->p_fstype = FS_UNUSED;
288: } else {
289: npp->p_fstype = sun_fstypes[i];
290: if (npp->p_fstype == FS_BSDFFS) {
291: /*
292: * The sun label does not store the FFS fields,
293: * so just set them with default values here.
294: */
295: npp->p_fragblock =
296: DISKLABELV1_FFS_FRAGBLOCK(1024, 8);
297: npp->p_cpg = 16;
298: }
299: }
300: }
301:
302: /*
303: * XXX BandAid XXX
304: * UniOS rootfs sits on part c which don't begin at sect 0,
305: * and impossible to mount. Thus, make it usable as part b.
306: */
307: if (sl->sl_rpm == 0 && DL_GETPOFFSET(&lp->d_partitions[2]) != 0) {
308: lp->d_partitions[1] = lp->d_partitions[2];
309: lp->d_partitions[1].p_fstype = FS_BSDFFS;
310: }
311:
312: lp->d_checksum = 0;
313: lp->d_checksum = dkcksum(lp);
314: return (NULL);
315: }
316:
317: /*
318: * Given a BSD disk label, update the UniOS disklabel
319: * pointed to by sl with the new info. Note that the
320: * UniOS disklabel may have other info we need to keep.
321: * Returns zero or error code.
322: */
323: int
324: disklabel_bsd_to_om(struct disklabel *lp, struct sun_disklabel *sl)
325: {
326: struct partition *npp;
327: struct sun_dkpart *spp;
328: int i;
329: u_short cksum, *sp1, *sp2;
330:
331: if (lp->d_secsize != 512)
332: return (EINVAL);
333:
334: /* Format conversion. */
335: memcpy(sl->sl_text, lp->d_packname, sizeof(lp->d_packname));
336: sl->sl_rpm = 0; /* UniOS */
337: #if 0 /* leave as was */
338: sl->sl_pcyl = lp->d_ncylinders + lp->d_acylinders; /* XXX */
339: sl->sl_sparespercyl = lp->d_sparespercyl;
340: #endif
341: sl->sl_interleave = lp->d_interleave;
342: sl->sl_ncylinders = lp->d_ncylinders;
343: sl->sl_acylinders = lp->d_acylinders;
344: sl->sl_ntracks = lp->d_ntracks;
345: sl->sl_nsectors = lp->d_nsectors;
346:
347: for (i = 0; i < 8; i++) {
348: spp = &sl->sl_part[i];
349: npp = &lp->d_partitions[i];
350:
351: spp->sdkp_cyloffset = DL_GETPOFFSET(npp); /* UniOS */
352: spp->sdkp_nsectors = DL_GETPSIZE(npp);
353: }
354: sl->sl_magic = SUN_DKMAGIC;
355:
356: /* Correct the XOR check. */
357: sp1 = (u_short *)sl;
358: sp2 = (u_short *)(sl + 1);
359: sl->sl_cksum = cksum = 0;
360: while (sp1 < sp2)
361: cksum ^= *sp1++;
362: sl->sl_cksum = cksum;
363:
364: return (0);
365: }
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