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subr_diskslice.c
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Wed Jun 2 17:18:43 2004 UTC (8 years, 11 months ago) by
dillon
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CVS tags:
HEAD,
DragonFly_Stable,
DragonFly_Snap29Sep2004,
DragonFly_Snap13Sep2004,
DragonFly_RELEASE_1_2_Slip,
DragonFly_RELEASE_1_2,
DragonFly_1_0_REL,
DragonFly_1_0_RC1,
DragonFly_1_0A_REL
ANSIfication and cleanup. No functional changes.
Submitted-by: Tim Wickberg <me@k9mach3.org>
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 1.8 2004/06/02 17:18:43 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_wlabel (struct diskslices *ssp, int slice, int wlabel);
82:
83: /*
84: * Duplicate a label for the whole disk, and initialize defaults in the
85: * copy for fields that are not already initialized. The caller only
86: * needs to initialize d_secsize and d_secperunit, and zero the fields
87: * that are to be defaulted.
88: */
89: static struct disklabel *
90: clone_label(struct disklabel *lp)
91: {
92: struct disklabel *lp1;
93:
94: lp1 = malloc(sizeof *lp1, M_DEVBUF, M_WAITOK);
95: *lp1 = *lp;
96: lp = NULL;
97: if (lp1->d_typename[0] == '\0')
98: strncpy(lp1->d_typename, "amnesiac", sizeof(lp1->d_typename));
99: if (lp1->d_packname[0] == '\0')
100: strncpy(lp1->d_packname, "fictitious", sizeof(lp1->d_packname));
101: if (lp1->d_nsectors == 0)
102: lp1->d_nsectors = 32;
103: if (lp1->d_ntracks == 0)
104: lp1->d_ntracks = 64;
105: lp1->d_secpercyl = lp1->d_nsectors * lp1->d_ntracks;
106: lp1->d_ncylinders = lp1->d_secperunit / lp1->d_secpercyl;
107: if (lp1->d_rpm == 0)
108: lp1->d_rpm = 3600;
109: if (lp1->d_interleave == 0)
110: lp1->d_interleave = 1;
111: if (lp1->d_npartitions < RAW_PART + 1)
112: lp1->d_npartitions = MAXPARTITIONS;
113: if (lp1->d_bbsize == 0)
114: lp1->d_bbsize = BBSIZE;
115: if (lp1->d_sbsize == 0)
116: lp1->d_sbsize = SBSIZE;
117: lp1->d_partitions[RAW_PART].p_size = lp1->d_secperunit;
118: lp1->d_magic = DISKMAGIC;
119: lp1->d_magic2 = DISKMAGIC;
120: lp1->d_checksum = dkcksum(lp1);
121: return (lp1);
122: }
123:
124: /*
125: * Determine the size of the transfer, and make sure it is
126: * within the boundaries of the partition. Adjust transfer
127: * if needed, and signal errors or early completion.
128: *
129: * XXX TODO:
130: * o Split buffers that are too big for the device.
131: * o Check for overflow.
132: * o Finish cleaning this up.
133: */
134: int
135: dscheck(struct buf *bp, struct diskslices *ssp)
136: {
137: daddr_t blkno;
138: u_long endsecno;
139: daddr_t labelsect;
140: struct disklabel *lp;
141: char *msg;
142: long nsec;
143: struct partition *pp;
144: daddr_t secno;
145: daddr_t slicerel_secno;
146: struct diskslice *sp;
147: int s;
148:
149: blkno = bp->b_blkno;
150: if (blkno < 0) {
151: printf("dscheck(%s): negative b_blkno %ld\n",
152: devtoname(bp->b_dev), (long)blkno);
153: bp->b_error = EINVAL;
154: goto bad;
155: }
156: sp = &ssp->dss_slices[dkslice(bp->b_dev)];
157: lp = sp->ds_label;
158: if (ssp->dss_secmult == 1) {
159: if (bp->b_bcount % (u_long)DEV_BSIZE)
160: goto bad_bcount;
161: secno = blkno;
162: nsec = bp->b_bcount >> DEV_BSHIFT;
163: } else if (ssp->dss_secshift != -1) {
164: if (bp->b_bcount & (ssp->dss_secsize - 1))
165: goto bad_bcount;
166: if (blkno & (ssp->dss_secmult - 1))
167: goto bad_blkno;
168: secno = blkno >> ssp->dss_secshift;
169: nsec = bp->b_bcount >> (DEV_BSHIFT + ssp->dss_secshift);
170: } else {
171: if (bp->b_bcount % ssp->dss_secsize)
172: goto bad_bcount;
173: if (blkno % ssp->dss_secmult)
174: goto bad_blkno;
175: secno = blkno / ssp->dss_secmult;
176: nsec = bp->b_bcount / ssp->dss_secsize;
177: }
178: if (lp == NULL) {
179: labelsect = -LABELSECTOR - 1;
180: endsecno = sp->ds_size;
181: slicerel_secno = secno;
182: } else {
183: labelsect = lp->d_partitions[LABEL_PART].p_offset;
184: if (labelsect != 0)
185: Debugger("labelsect != 0 in dscheck()");
186: pp = &lp->d_partitions[dkpart(bp->b_dev)];
187: endsecno = pp->p_size;
188: slicerel_secno = pp->p_offset + secno;
189: }
190:
191: /* overwriting disk label ? */
192: /* XXX should also protect bootstrap in first 8K */
193: if (slicerel_secno <= LABELSECTOR + labelsect &&
194: #if LABELSECTOR != 0
195: slicerel_secno + nsec > LABELSECTOR + labelsect &&
196: #endif
197: (bp->b_flags & B_READ) == 0 && sp->ds_wlabel == 0) {
198: bp->b_error = EROFS;
199: goto bad;
200: }
201:
202: #if defined(DOSBBSECTOR) && defined(notyet)
203: /* overwriting master boot record? */
204: if (slicerel_secno <= DOSBBSECTOR && (bp->b_flags & B_READ) == 0 &&
205: sp->ds_wlabel == 0) {
206: bp->b_error = EROFS;
207: goto bad;
208: }
209: #endif
210:
211: /* beyond partition? */
212: if (secno + nsec > endsecno) {
213: /* if exactly at end of disk, return an EOF */
214: if (secno == endsecno) {
215: bp->b_resid = bp->b_bcount;
216: return (0);
217: }
218: /* or truncate if part of it fits */
219: nsec = endsecno - secno;
220: if (nsec <= 0) {
221: bp->b_error = EINVAL;
222: goto bad;
223: }
224: bp->b_bcount = nsec * ssp->dss_secsize;
225: }
226:
227: bp->b_pblkno = sp->ds_offset + slicerel_secno;
228:
229: /*
230: * Snoop on label accesses if the slice offset is nonzero. Fudge
231: * offsets in the label to keep the in-core label coherent with
232: * the on-disk one.
233: */
234: if (slicerel_secno <= LABELSECTOR + labelsect
235: #if LABELSECTOR != 0
236: && slicerel_secno + nsec > LABELSECTOR + labelsect
237: #endif
238: && sp->ds_offset != 0) {
239: struct iodone_chain *ic;
240:
241: ic = malloc(sizeof *ic , M_DEVBUF, M_WAITOK);
242: ic->ic_prev_flags = bp->b_flags;
243: ic->ic_prev_iodone = bp->b_iodone;
244: ic->ic_prev_iodone_chain = bp->b_iodone_chain;
245: ic->ic_args[0].ia_long = (LABELSECTOR + labelsect -
246: slicerel_secno) * ssp->dss_secsize;
247: ic->ic_args[1].ia_ptr = sp;
248: bp->b_flags |= B_CALL;
249: bp->b_iodone = dsiodone;
250: bp->b_iodone_chain = ic;
251: if (!(bp->b_flags & B_READ)) {
252: /*
253: * XXX even disklabel(8) writes directly so we need
254: * to adjust writes. Perhaps we should drop support
255: * for DIOCWLABEL (always write protect labels) and
256: * require the use of DIOCWDINFO.
257: *
258: * XXX probably need to copy the data to avoid even
259: * temporarily corrupting the in-core copy.
260: */
261: if (bp->b_vp != NULL) {
262: s = splbio();
263: bp->b_vp->v_numoutput++;
264: splx(s);
265: }
266: /* XXX need name here. */
267: msg = fixlabel((char *)NULL, sp,
268: (struct disklabel *)
269: (bp->b_data + ic->ic_args[0].ia_long),
270: TRUE);
271: if (msg != NULL) {
272: printf("dscheck(%s): %s\n",
273: devtoname(bp->b_dev), msg);
274: bp->b_error = EROFS;
275: goto bad;
276: }
277: }
278: }
279: return (1);
280:
281: bad_bcount:
282: printf(
283: "dscheck(%s): b_bcount %ld is not on a sector boundary (ssize %d)\n",
284: devtoname(bp->b_dev), bp->b_bcount, ssp->dss_secsize);
285: bp->b_error = EINVAL;
286: goto bad;
287:
288: bad_blkno:
289: printf(
290: "dscheck(%s): b_blkno %ld is not on a sector boundary (ssize %d)\n",
291: devtoname(bp->b_dev), (long)blkno, ssp->dss_secsize);
292: bp->b_error = EINVAL;
293: goto bad;
294:
295: bad:
296: bp->b_resid = bp->b_bcount;
297: bp->b_flags |= B_ERROR;
298: return (-1);
299: }
300:
301: void
302: dsclose(dev_t dev, int mode, struct diskslices *ssp)
303: {
304: u_char mask;
305: struct diskslice *sp;
306:
307: sp = &ssp->dss_slices[dkslice(dev)];
308: mask = 1 << dkpart(dev);
309: sp->ds_openmask &= ~mask;
310: }
311:
312: void
313: dsgone(struct diskslices **sspp)
314: {
315: int slice;
316: struct diskslice *sp;
317: struct diskslices *ssp;
318:
319: for (slice = 0, ssp = *sspp; slice < ssp->dss_nslices; slice++) {
320: sp = &ssp->dss_slices[slice];
321: free_ds_label(ssp, slice);
322: }
323: free(ssp, M_DEVBUF);
324: *sspp = NULL;
325: }
326:
327: /*
328: * For the "write" commands (DIOCSDINFO and DIOCWDINFO), this
329: * is subject to the same restriction as dsopen().
330: */
331: int
332: dsioctl(dev_t dev, u_long cmd, caddr_t data,
333: int flags, struct diskslices **sspp)
334: {
335: int error;
336: struct disklabel *lp;
337: int old_wlabel;
338: u_char openmask;
339: int part;
340: int slice;
341: struct diskslice *sp;
342: struct diskslices *ssp;
343: struct partition *pp;
344:
345: slice = dkslice(dev);
346: ssp = *sspp;
347: sp = &ssp->dss_slices[slice];
348: lp = sp->ds_label;
349: switch (cmd) {
350:
351: case DIOCGDVIRGIN:
352: lp = (struct disklabel *)data;
353: if (ssp->dss_slices[WHOLE_DISK_SLICE].ds_label) {
354: *lp = *ssp->dss_slices[WHOLE_DISK_SLICE].ds_label;
355: } else {
356: bzero(lp, sizeof(struct disklabel));
357: }
358:
359: lp->d_magic = DISKMAGIC;
360: lp->d_magic2 = DISKMAGIC;
361: pp = &lp->d_partitions[RAW_PART];
362: pp->p_offset = 0;
363: pp->p_size = sp->ds_size;
364:
365: lp->d_npartitions = MAXPARTITIONS;
366: if (lp->d_interleave == 0)
367: lp->d_interleave = 1;
368: if (lp->d_rpm == 0)
369: lp->d_rpm = 3600;
370: if (lp->d_nsectors == 0)
371: lp->d_nsectors = 32;
372: if (lp->d_ntracks == 0)
373: lp->d_ntracks = 64;
374:
375: lp->d_bbsize = BBSIZE;
376: lp->d_sbsize = SBSIZE;
377: lp->d_secpercyl = lp->d_nsectors * lp->d_ntracks;
378: lp->d_ncylinders = sp->ds_size / lp->d_secpercyl;
379: lp->d_secperunit = sp->ds_size;
380: lp->d_checksum = 0;
381: lp->d_checksum = dkcksum(lp);
382: return (0);
383:
384: case DIOCGDINFO:
385: if (lp == NULL)
386: return (EINVAL);
387: *(struct disklabel *)data = *lp;
388: return (0);
389:
390: #ifdef notyet
391: case DIOCGDINFOP:
392: if (lp == NULL)
393: return (EINVAL);
394: *(struct disklabel **)data = lp;
395: return (0);
396: #endif
397:
398: case DIOCGPART:
399: if (lp == NULL)
400: return (EINVAL);
401: ((struct partinfo *)data)->disklab = lp;
402: ((struct partinfo *)data)->part
403: = &lp->d_partitions[dkpart(dev)];
404: return (0);
405:
406: case DIOCGSLICEINFO:
407: bcopy(ssp, data, (char *)&ssp->dss_slices[ssp->dss_nslices] -
408: (char *)ssp);
409: return (0);
410:
411: case DIOCSDINFO:
412: if (slice == WHOLE_DISK_SLICE)
413: return (ENODEV);
414: if (!(flags & FWRITE))
415: return (EBADF);
416: lp = malloc(sizeof *lp, M_DEVBUF, M_WAITOK);
417: if (sp->ds_label == NULL)
418: bzero(lp, sizeof *lp);
419: else
420: bcopy(sp->ds_label, lp, sizeof *lp);
421: if (sp->ds_label == NULL)
422: openmask = 0;
423: else {
424: openmask = sp->ds_openmask;
425: if (slice == COMPATIBILITY_SLICE)
426: openmask |= ssp->dss_slices[
427: ssp->dss_first_bsd_slice].ds_openmask;
428: else if (slice == ssp->dss_first_bsd_slice)
429: openmask |= ssp->dss_slices[
430: COMPATIBILITY_SLICE].ds_openmask;
431: }
432: error = setdisklabel(lp, (struct disklabel *)data,
433: (u_long)openmask);
434: /* XXX why doesn't setdisklabel() check this? */
435: if (error == 0 && lp->d_partitions[RAW_PART].p_offset != 0)
436: error = EXDEV;
437: if (error == 0) {
438: if (lp->d_secperunit > sp->ds_size)
439: error = ENOSPC;
440: for (part = 0; part < lp->d_npartitions; part++)
441: if (lp->d_partitions[part].p_size > sp->ds_size)
442: error = ENOSPC;
443: }
444: if (error != 0) {
445: free(lp, M_DEVBUF);
446: return (error);
447: }
448: free_ds_label(ssp, slice);
449: set_ds_label(ssp, slice, lp);
450: return (0);
451:
452: case DIOCSYNCSLICEINFO:
453: if (slice != WHOLE_DISK_SLICE || dkpart(dev) != RAW_PART)
454: return (EINVAL);
455: if (!*(int *)data)
456: for (slice = 0; slice < ssp->dss_nslices; slice++) {
457: openmask = ssp->dss_slices[slice].ds_openmask;
458: if (openmask
459: && (slice != WHOLE_DISK_SLICE
460: || openmask & ~(1 << RAW_PART)))
461: return (EBUSY);
462: }
463:
464: /*
465: * Temporarily forget the current slices struct and read
466: * the current one.
467: * XXX should wait for current accesses on this disk to
468: * complete, then lock out future accesses and opens.
469: */
470: *sspp = NULL;
471: lp = malloc(sizeof *lp, M_DEVBUF, M_WAITOK);
472: *lp = *ssp->dss_slices[WHOLE_DISK_SLICE].ds_label;
473: error = dsopen(dev, S_IFCHR, ssp->dss_oflags, sspp, lp);
474: if (error != 0) {
475: free(lp, M_DEVBUF);
476: *sspp = ssp;
477: return (error);
478: }
479:
480: /*
481: * Reopen everything. This is a no-op except in the "force"
482: * case and when the raw bdev and cdev are both open. Abort
483: * if anything fails.
484: */
485: for (slice = 0; slice < ssp->dss_nslices; slice++) {
486: for (openmask = ssp->dss_slices[slice].ds_openmask,
487: part = 0; openmask; openmask >>= 1, part++) {
488: if (!(openmask & 1))
489: continue;
490: error = dsopen(dkmodslice(dkmodpart(dev, part),
491: slice),
492: S_IFCHR, ssp->dss_oflags, sspp,
493: lp);
494: if (error != 0) {
495: free(lp, M_DEVBUF);
496: *sspp = ssp;
497: return (EBUSY);
498: }
499: }
500: }
501:
502: free(lp, M_DEVBUF);
503: dsgone(&ssp);
504: return (0);
505:
506: case DIOCWDINFO:
507: error = dsioctl(dev, DIOCSDINFO, data, flags, &ssp);
508: if (error != 0)
509: return (error);
510: /*
511: * XXX this used to hack on dk_openpart to fake opening
512: * partition 0 in case that is used instead of dkpart(dev).
513: */
514: old_wlabel = sp->ds_wlabel;
515: set_ds_wlabel(ssp, slice, TRUE);
516: error = writedisklabel(dev, sp->ds_label);
517: /* XXX should invalidate in-core label if write failed. */
518: set_ds_wlabel(ssp, slice, old_wlabel);
519: return (error);
520:
521: case DIOCWLABEL:
522: #ifndef __alpha__
523: if (slice == WHOLE_DISK_SLICE)
524: return (ENODEV);
525: #endif
526: if (!(flags & FWRITE))
527: return (EBADF);
528: set_ds_wlabel(ssp, slice, *(int *)data != 0);
529: return (0);
530:
531: default:
532: return (ENOIOCTL);
533: }
534: }
535:
536: static void
537: dsiodone(struct buf *bp)
538: {
539: struct iodone_chain *ic;
540: char *msg;
541:
542: ic = bp->b_iodone_chain;
543: bp->b_flags = (ic->ic_prev_flags & B_CALL)
544: | (bp->b_flags & ~(B_CALL | B_DONE));
545: bp->b_iodone = ic->ic_prev_iodone;
546: bp->b_iodone_chain = ic->ic_prev_iodone_chain;
547: if (!(bp->b_flags & B_READ)
548: || (!(bp->b_flags & B_ERROR) && bp->b_error == 0)) {
549: msg = fixlabel((char *)NULL, ic->ic_args[1].ia_ptr,
550: (struct disklabel *)
551: (bp->b_data + ic->ic_args[0].ia_long),
552: FALSE);
553: if (msg != NULL)
554: printf("%s\n", msg);
555: }
556: free(ic, M_DEVBUF);
557: biodone(bp);
558: }
559:
560: int
561: dsisopen(struct diskslices *ssp)
562: {
563: int slice;
564:
565: if (ssp == NULL)
566: return (0);
567: for (slice = 0; slice < ssp->dss_nslices; slice++) {
568: if (ssp->dss_slices[slice].ds_openmask)
569: return (1);
570: }
571: return (0);
572: }
573:
574: /*
575: * Allocate a slices "struct" and initialize it to contain only an empty
576: * compatibility slice (pointing to itself), a whole disk slice (covering
577: * the disk as described by the label), and (nslices - BASE_SLICES) empty
578: * slices beginning at BASE_SLICE.
579: */
580: struct diskslices *
581: dsmakeslicestruct(int nslices, struct disklabel *lp)
582: {
583: struct diskslice *sp;
584: struct diskslices *ssp;
585:
586: ssp = malloc(offsetof(struct diskslices, dss_slices) +
587: nslices * sizeof *sp, M_DEVBUF, M_WAITOK);
588: ssp->dss_first_bsd_slice = COMPATIBILITY_SLICE;
589: ssp->dss_nslices = nslices;
590: ssp->dss_oflags = 0;
591: ssp->dss_secmult = lp->d_secsize / DEV_BSIZE;
592: if (ssp->dss_secmult & (ssp->dss_secmult - 1))
593: ssp->dss_secshift = -1;
594: else
595: ssp->dss_secshift = ffs(ssp->dss_secmult) - 1;
596: ssp->dss_secsize = lp->d_secsize;
597: sp = &ssp->dss_slices[0];
598: bzero(sp, nslices * sizeof *sp);
599: sp[WHOLE_DISK_SLICE].ds_size = lp->d_secperunit;
600: return (ssp);
601: }
602:
603: char *
604: dsname(dev_t dev, int unit, int slice, int part, char *partname)
605: {
606: static char name[32];
607: const char *dname;
608:
609: dname = dev_dname(dev);
610: if (strlen(dname) > 16)
611: dname = "nametoolong";
612: snprintf(name, sizeof(name), "%s%d", dname, unit);
613: partname[0] = '\0';
614: if (slice != WHOLE_DISK_SLICE || part != RAW_PART) {
615: partname[0] = 'a' + part;
616: partname[1] = '\0';
617: if (slice != COMPATIBILITY_SLICE) {
618: snprintf(name + strlen(name),
619: sizeof(name) - strlen(name), "s%d", slice - 1);
620: }
621: }
622: return (name);
623: }
624:
625: /*
626: * This should only be called when the unit is inactive and the strategy
627: * routine should not allow it to become active unless we call it. Our
628: * strategy routine must be special to allow activity.
629: */
630: int
631: dsopen(dev_t dev, int mode, u_int flags,
632: struct diskslices **sspp, struct disklabel *lp)
633: {
634: dev_t dev1;
635: int error;
636: struct disklabel *lp1;
637: char *msg;
638: u_char mask;
639: bool_t need_init;
640: int part;
641: char partname[2];
642: int slice;
643: char *sname;
644: struct diskslice *sp;
645: struct diskslices *ssp;
646: int unit;
647:
648: dev->si_bsize_phys = lp->d_secsize;
649:
650: unit = dkunit(dev);
651: if (lp->d_secsize % DEV_BSIZE) {
652: printf("%s: invalid sector size %lu\n", devtoname(dev),
653: (u_long)lp->d_secsize);
654: return (EINVAL);
655: }
656:
657: /*
658: * XXX reinitialize the slice table unless there is an open device
659: * on the unit. This should only be done if the media has changed.
660: */
661: ssp = *sspp;
662: need_init = !dsisopen(ssp);
663: if (ssp != NULL && need_init)
664: dsgone(sspp);
665: if (need_init) {
666: /*
667: * Allocate a minimal slices "struct". This will become
668: * the final slices "struct" if we don't want real slices
669: * or if we can't find any real slices.
670: */
671: *sspp = dsmakeslicestruct(BASE_SLICE, lp);
672:
673: if (!(flags & DSO_ONESLICE)) {
674: TRACE(("dsinit\n"));
675: error = dsinit(dev, lp, sspp);
676: if (error != 0) {
677: dsgone(sspp);
678: return (error);
679: }
680: }
681: ssp = *sspp;
682: ssp->dss_oflags = flags;
683:
684: /*
685: * If there are no real slices, then make the compatiblity
686: * slice cover the whole disk.
687: */
688: if (ssp->dss_nslices == BASE_SLICE)
689: ssp->dss_slices[COMPATIBILITY_SLICE].ds_size
690: = lp->d_secperunit;
691:
692: /* Point the compatibility slice at the BSD slice, if any. */
693: for (slice = BASE_SLICE; slice < ssp->dss_nslices; slice++) {
694: sp = &ssp->dss_slices[slice];
695: if (sp->ds_type == DOSPTYP_386BSD /* XXX */) {
696: ssp->dss_first_bsd_slice = slice;
697: ssp->dss_slices[COMPATIBILITY_SLICE].ds_offset
698: = sp->ds_offset;
699: ssp->dss_slices[COMPATIBILITY_SLICE].ds_size
700: = sp->ds_size;
701: ssp->dss_slices[COMPATIBILITY_SLICE].ds_type
702: = sp->ds_type;
703: break;
704: }
705: }
706:
707: ssp->dss_slices[WHOLE_DISK_SLICE].ds_label = clone_label(lp);
708: ssp->dss_slices[WHOLE_DISK_SLICE].ds_wlabel = TRUE;
709: }
710:
711: /*
712: * Initialize secondary info for all slices. It is needed for more
713: * than the current slice in the DEVFS case. XXX DEVFS is no more.
714: */
715: for (slice = 0; slice < ssp->dss_nslices; slice++) {
716: sp = &ssp->dss_slices[slice];
717: if (sp->ds_label != NULL
718: #ifdef __alpha__
719: && slice != WHOLE_DISK_SLICE
720: #endif
721: )
722: continue;
723: dev1 = dkmodslice(dkmodpart(dev, RAW_PART), slice);
724: sname = dsname(dev, unit, slice, RAW_PART, partname);
725: /*
726: * XXX this should probably only be done for the need_init
727: * case, but there may be a problem with DIOCSYNCSLICEINFO.
728: */
729: set_ds_wlabel(ssp, slice, TRUE); /* XXX invert */
730: lp1 = clone_label(lp);
731: TRACE(("readdisklabel\n"));
732: if (flags & DSO_NOLABELS)
733: msg = NULL;
734: else {
735: msg = readdisklabel(dev1, lp1);
736:
737: /*
738: * readdisklabel() returns NULL for success, and an
739: * error string for failure.
740: *
741: * If there isn't a label on the disk, and if the
742: * DSO_COMPATLABEL is set, we want to use the
743: * faked-up label provided by the caller.
744: *
745: * So we set msg to NULL to indicate that there is
746: * no failure (since we have a faked-up label),
747: * free lp1, and then clone it again from lp.
748: * (In case readdisklabel() modified lp1.)
749: */
750: if (msg != NULL && (flags & DSO_COMPATLABEL)) {
751: msg = NULL;
752: free(lp1, M_DEVBUF);
753: lp1 = clone_label(lp);
754: }
755: }
756: if (msg == NULL)
757: msg = fixlabel(sname, sp, lp1, FALSE);
758: if (msg == NULL && lp1->d_secsize != ssp->dss_secsize)
759: msg = "inconsistent sector size";
760: if (msg != NULL) {
761: if (sp->ds_type == DOSPTYP_386BSD /* XXX */)
762: log(LOG_WARNING, "%s: cannot find label (%s)\n",
763: sname, msg);
764: free(lp1, M_DEVBUF);
765: continue;
766: }
767: if (lp1->d_flags & D_BADSECT) {
768: log(LOG_ERR, "%s: bad sector table not supported\n",
769: sname);
770: free(lp1, M_DEVBUF);
771: continue;
772: }
773: set_ds_label(ssp, slice, lp1);
774: set_ds_wlabel(ssp, slice, FALSE);
775: }
776:
777: slice = dkslice(dev);
778: if (slice >= ssp->dss_nslices)
779: return (ENXIO);
780: sp = &ssp->dss_slices[slice];
781: part = dkpart(dev);
782: if (part != RAW_PART
783: && (sp->ds_label == NULL || part >= sp->ds_label->d_npartitions))
784: return (EINVAL); /* XXX needs translation */
785: mask = 1 << part;
786: sp->ds_openmask |= mask;
787: return (0);
788: }
789:
790: int
791: dssize(dev_t dev, struct diskslices **sspp)
792: {
793: struct disklabel *lp;
794: int part;
795: int slice;
796: struct diskslices *ssp;
797:
798: slice = dkslice(dev);
799: part = dkpart(dev);
800: ssp = *sspp;
801: if (ssp == NULL || slice >= ssp->dss_nslices
802: || !(ssp->dss_slices[slice].ds_openmask & (1 << part))) {
803: if (dev_dopen(dev, FREAD, S_IFCHR, NULL) != 0)
804: return (-1);
805: dev_dclose(dev, FREAD, S_IFCHR, NULL);
806: ssp = *sspp;
807: }
808: lp = ssp->dss_slices[slice].ds_label;
809: if (lp == NULL)
810: return (-1);
811: return ((int)lp->d_partitions[part].p_size);
812: }
813:
814: static void
815: free_ds_label(struct diskslices *ssp, int slice)
816: {
817: struct disklabel *lp;
818: struct diskslice *sp;
819:
820: sp = &ssp->dss_slices[slice];
821: lp = sp->ds_label;
822: if (lp == NULL)
823: return;
824: free(lp, M_DEVBUF);
825: set_ds_label(ssp, slice, (struct disklabel *)NULL);
826: }
827:
828: static char *
829: fixlabel(char *sname, struct diskslice *sp, struct disklabel *lp, int writeflag)
830: {
831: u_long end;
832: u_long offset;
833: int part;
834: struct partition *pp;
835: u_long start;
836: bool_t warned;
837:
838: /* These errors "can't happen" so don't bother reporting details. */
839: if (lp->d_magic != DISKMAGIC || lp->d_magic2 != DISKMAGIC)
840: return ("fixlabel: invalid magic");
841: if (dkcksum(lp) != 0)
842: return ("fixlabel: invalid checksum");
843:
844: pp = &lp->d_partitions[RAW_PART];
845: if (writeflag) {
846: start = 0;
847: offset = sp->ds_offset;
848: } else {
849: start = sp->ds_offset;
850: offset = -sp->ds_offset;
851: }
852: if (pp->p_offset != start) {
853: if (sname != NULL) {
854: printf(
855: "%s: rejecting BSD label: raw partition offset != slice offset\n",
856: sname);
857: slice_info(sname, sp);
858: partition_info(sname, RAW_PART, pp);
859: }
860: return ("fixlabel: raw partition offset != slice offset");
861: }
862: if (pp->p_size != sp->ds_size) {
863: if (sname != NULL) {
864: printf("%s: raw partition size != slice size\n", sname);
865: slice_info(sname, sp);
866: partition_info(sname, RAW_PART, pp);
867: }
868: if (pp->p_size > sp->ds_size) {
869: if (sname == NULL)
870: return ("fixlabel: raw partition size > slice size");
871: printf("%s: truncating raw partition\n", sname);
872: pp->p_size = sp->ds_size;
873: }
874: }
875: end = start + sp->ds_size;
876: if (start > end)
877: return ("fixlabel: slice wraps");
878: if (lp->d_secpercyl <= 0)
879: return ("fixlabel: d_secpercyl <= 0");
880: pp -= RAW_PART;
881: warned = FALSE;
882: for (part = 0; part < lp->d_npartitions; part++, pp++) {
883: if (pp->p_offset != 0 || pp->p_size != 0) {
884: if (pp->p_offset < start
885: || pp->p_offset + pp->p_size > end
886: || pp->p_offset + pp->p_size < pp->p_offset) {
887: if (sname != NULL) {
888: printf(
889: "%s: rejecting partition in BSD label: it isn't entirely within the slice\n",
890: sname);
891: if (!warned) {
892: slice_info(sname, sp);
893: warned = TRUE;
894: }
895: partition_info(sname, part, pp);
896: }
897: /* XXX else silently discard junk. */
898: bzero(pp, sizeof *pp);
899: } else
900: pp->p_offset += offset;
901: }
902: }
903: lp->d_ncylinders = sp->ds_size / lp->d_secpercyl;
904: lp->d_secperunit = sp->ds_size;
905: lp->d_checksum = 0;
906: lp->d_checksum = dkcksum(lp);
907: return (NULL);
908: }
909:
910: static void
911: partition_info(char *sname, int part, struct partition *pp)
912: {
913: printf("%s%c: start %lu, end %lu, size %lu\n", sname, 'a' + part,
914: (u_long)pp->p_offset, (u_long)(pp->p_offset + pp->p_size - 1),
915: (u_long)pp->p_size);
916: }
917:
918: static void
919: slice_info(char *sname, struct diskslice *sp)
920: {
921: printf("%s: start %lu, end %lu, size %lu\n", sname,
922: sp->ds_offset, sp->ds_offset + sp->ds_size - 1, sp->ds_size);
923: }
924:
925: static void
926: set_ds_label(struct diskslices *ssp, int slice, struct disklabel *lp)
927: {
928: ssp->dss_slices[slice].ds_label = lp;
929: if (slice == COMPATIBILITY_SLICE)
930: ssp->dss_slices[ssp->dss_first_bsd_slice].ds_label = lp;
931: else if (slice == ssp->dss_first_bsd_slice)
932: ssp->dss_slices[COMPATIBILITY_SLICE].ds_label = lp;
933: }
934:
935: static void
936: set_ds_wlabel(struct diskslices *ssp, int slice, int wlabel)
937: {
938: ssp->dss_slices[slice].ds_wlabel = wlabel;
939: if (slice == COMPATIBILITY_SLICE)
940: ssp->dss_slices[ssp->dss_first_bsd_slice].ds_wlabel = wlabel;
941: else if (slice == ssp->dss_first_bsd_slice)
942: ssp->dss_slices[COMPATIBILITY_SLICE].ds_wlabel = wlabel;
943: }
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