1/*-
2 * Copyright (c) 2003 Poul-Henning Kamp.
3 * Copyright (c) 1995 Jason R. Thorpe.
4 * Copyright (c) 1990, 1993
5 * The Regents of the University of California. All rights reserved.
6 * All rights reserved.
7 * Copyright (c) 1988 University of Utah.
8 *

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45 * Moffett Field, CA 94035
46 *
47 * from: Utah $Hdr: cd.c 1.6 90/11/28$
48 * @(#)cd.c 8.2 (Berkeley) 11/16/93
49 * $NetBSD: ccd.c,v 1.22 1995/12/08 19:13:26 thorpej Exp $
50 */
51
52#include <sys/cdefs.h>
53__FBSDID("$FreeBSD: head/sys/geom/geom_ccd.c 157740 2006-04-13 20:35:31Z cracauer $");
54
55#include <sys/param.h>
56#include <sys/systm.h>
57#include <sys/kernel.h>
58#include <sys/module.h>
59#include <sys/bio.h>
60#include <sys/malloc.h>
61#include <geom/geom.h>

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67 */
68#if !defined(CCD_OFFSET)
69#define CCD_OFFSET 16
70#endif
71
72/* sc_flags */
73#define CCDF_UNIFORM 0x02 /* use LCCD of sizes for uniform interleave */
74#define CCDF_MIRROR 0x04 /* use mirroring */
75#define CCDF_NO_OFFSET 0x08 /* do not leave space in front */
76#define CCDF_LINUX 0x10 /* use Linux compatibility mode */
77
78/* Mask of user-settable ccd flags. */
79#define CCDF_USERMASK (CCDF_UNIFORM|CCDF_MIRROR)
80
81/*
82 * Interleave description table.
83 * Computed at boot time to speed irregular-interleave lookups.
84 * The idea is that we interleave in "groups". First we interleave

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133 daddr_t sc_size; /* size of ccd */
134 int sc_ileave; /* interleave */
135 u_int sc_ndisks; /* number of components */
136 struct ccdcinfo *sc_cinfo; /* component info */
137 struct ccdiinfo *sc_itable; /* interleave table */
138 u_int32_t sc_secsize; /* # bytes per sector */
139 int sc_pick; /* side of mirror picked */
140 daddr_t sc_blk[2]; /* mirror localization */
141 u_int32_t sc_offset; /* actual offset used */
142};
143
144static g_start_t g_ccd_start;
145static void ccdiodone(struct bio *bp);
146static void ccdinterleave(struct ccd_s *);
147static int ccdinit(struct gctl_req *req, struct ccd_s *);
148static int ccdbuffer(struct bio **ret, struct ccd_s *,
149 struct bio *, daddr_t, caddr_t, long);

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213 int maxsecsize;
214 off_t mediasize;
215 u_int sectorsize;
216
217 cs->sc_size = 0;
218
219 maxsecsize = 0;
220 minsize = 0;
221
222 if (cs->sc_flags & CCDF_LINUX) {
223 cs->sc_offset = 0;
224 cs->sc_ileave *= 2;
225 if (cs->sc_flags & CCDF_MIRROR && cs->sc_ndisks != 2)
226 gctl_error(req, "Mirror mode for Linux raids is "
227 "only supported with 2 devices");
228 } else {
229 if (cs->sc_flags & CCDF_NO_OFFSET)
230 cs->sc_offset = 0;
231 else
232 cs->sc_offset = CCD_OFFSET;
233
234 }
235 for (ix = 0; ix < cs->sc_ndisks; ix++) {
236 ci = &cs->sc_cinfo[ix];
237
238 mediasize = ci->ci_provider->mediasize;
239 sectorsize = ci->ci_provider->sectorsize;
240 if (sectorsize > maxsecsize)
241 maxsecsize = sectorsize;
242 size = mediasize / DEV_BSIZE - cs->sc_offset;
243
244 /* Truncate to interleave boundary */
245
246 if (cs->sc_ileave > 1)
247 size -= size % cs->sc_ileave;
248
249 if (size == 0) {
250 gctl_error(req, "Component %s has effective size zero",

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616
617 /*
618 * Fill in the component buf structure.
619 */
620 cbp = g_clone_bio(bp);
621 if (cbp == NULL)
622 return (ENOMEM);
623 cbp->bio_done = g_std_done;
624 cbp->bio_offset = dbtob(cbn + cboff + cs->sc_offset);
625 cbp->bio_data = addr;
626 if (cs->sc_ileave == 0)
627 cbc = dbtob((off_t)(ci->ci_size - cbn));
628 else
629 cbc = dbtob((off_t)(cs->sc_ileave - cboff));
630 cbp->bio_length = (cbc < bcount) ? cbc : bcount;
631
632 cbp->bio_from = ci->ci_consumer;

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752 KASSERT(error == 0, ("attach to %s failed", pp->name));
753 sc->sc_cinfo[i].ci_consumer = cp;
754 sc->sc_cinfo[i].ci_provider = pp;
755 }
756
757 sc->sc_unit = *unit;
758 sc->sc_ileave = *ileave;
759
760 if (gctl_get_param(req, "no_offset", NULL))
761 sc->sc_flags |= CCDF_NO_OFFSET;
762 if (gctl_get_param(req, "linux", NULL))
763 sc->sc_flags |= CCDF_LINUX;
764
765 if (gctl_get_param(req, "uniform", NULL))
766 sc->sc_flags |= CCDF_UNIFORM;
767 if (gctl_get_param(req, "mirror", NULL))
768 sc->sc_flags |= CCDF_MIRROR;
769
770 if (sc->sc_ileave == 0 && (sc->sc_flags & CCDF_MIRROR)) {
771 printf("%s: disabling mirror, interleave is 0\n", gp->name);
772 sc->sc_flags &= ~(CCDF_MIRROR);

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