1731 lines
42 KiB
C
1731 lines
42 KiB
C
/* $FreeBSD$ */
|
||
|
||
/* $NetBSD: ccd.c,v 1.22 1995/12/08 19:13:26 thorpej Exp $ */
|
||
|
||
/*
|
||
* Copyright (c) 1995 Jason R. Thorpe.
|
||
* All rights reserved.
|
||
*
|
||
* Redistribution and use in source and binary forms, with or without
|
||
* modification, are permitted provided that the following conditions
|
||
* are met:
|
||
* 1. Redistributions of source code must retain the above copyright
|
||
* notice, this list of conditions and the following disclaimer.
|
||
* 2. Redistributions in binary form must reproduce the above copyright
|
||
* notice, this list of conditions and the following disclaimer in the
|
||
* documentation and/or other materials provided with the distribution.
|
||
* 3. All advertising materials mentioning features or use of this software
|
||
* must display the following acknowledgement:
|
||
* This product includes software developed for the NetBSD Project
|
||
* by Jason R. Thorpe.
|
||
* 4. The name of the author may not be used to endorse or promote products
|
||
* derived from this software without specific prior written permission.
|
||
*
|
||
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
|
||
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
||
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
||
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
|
||
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
|
||
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
|
||
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
|
||
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
|
||
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
||
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
||
* SUCH DAMAGE.
|
||
*/
|
||
|
||
/*
|
||
* Copyright (c) 1988 University of Utah.
|
||
* Copyright (c) 1990, 1993
|
||
* The Regents of the University of California. All rights reserved.
|
||
*
|
||
* This code is derived from software contributed to Berkeley by
|
||
* the Systems Programming Group of the University of Utah Computer
|
||
* Science Department.
|
||
*
|
||
* Redistribution and use in source and binary forms, with or without
|
||
* modification, are permitted provided that the following conditions
|
||
* are met:
|
||
* 1. Redistributions of source code must retain the above copyright
|
||
* notice, this list of conditions and the following disclaimer.
|
||
* 2. Redistributions in binary form must reproduce the above copyright
|
||
* notice, this list of conditions and the following disclaimer in the
|
||
* documentation and/or other materials provided with the distribution.
|
||
* 3. All advertising materials mentioning features or use of this software
|
||
* must display the following acknowledgement:
|
||
* This product includes software developed by the University of
|
||
* California, Berkeley and its contributors.
|
||
* 4. Neither the name of the University nor the names of its contributors
|
||
* may be used to endorse or promote products derived from this software
|
||
* without specific prior written permission.
|
||
*
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||
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
||
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
||
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
||
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
||
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
||
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
||
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
||
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
||
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
||
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
||
* SUCH DAMAGE.
|
||
*
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||
* from: Utah $Hdr: cd.c 1.6 90/11/28$
|
||
*
|
||
* @(#)cd.c 8.2 (Berkeley) 11/16/93
|
||
*/
|
||
|
||
/*
|
||
* "Concatenated" disk driver.
|
||
*
|
||
* Dynamic configuration and disklabel support by:
|
||
* Jason R. Thorpe <thorpej@nas.nasa.gov>
|
||
* Numerical Aerodynamic Simulation Facility
|
||
* Mail Stop 258-6
|
||
* NASA Ames Research Center
|
||
* Moffett Field, CA 94035
|
||
*/
|
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|
||
#include "ccd.h"
|
||
|
||
#include <sys/param.h>
|
||
#include <sys/systm.h>
|
||
#include <sys/kernel.h>
|
||
#include <sys/module.h>
|
||
#include <sys/proc.h>
|
||
#include <sys/buf.h>
|
||
#include <sys/malloc.h>
|
||
#include <sys/namei.h>
|
||
#include <sys/conf.h>
|
||
#include <sys/stat.h>
|
||
#include <sys/sysctl.h>
|
||
#include <sys/disklabel.h>
|
||
#include <ufs/ffs/fs.h>
|
||
#include <sys/devicestat.h>
|
||
#include <sys/fcntl.h>
|
||
#include <sys/vnode.h>
|
||
|
||
#include <sys/ccdvar.h>
|
||
|
||
#include <vm/vm_zone.h>
|
||
|
||
#if defined(CCDDEBUG) && !defined(DEBUG)
|
||
#define DEBUG
|
||
#endif
|
||
|
||
#ifdef DEBUG
|
||
#define CCDB_FOLLOW 0x01
|
||
#define CCDB_INIT 0x02
|
||
#define CCDB_IO 0x04
|
||
#define CCDB_LABEL 0x08
|
||
#define CCDB_VNODE 0x10
|
||
static int ccddebug = CCDB_FOLLOW | CCDB_INIT | CCDB_IO | CCDB_LABEL |
|
||
CCDB_VNODE;
|
||
SYSCTL_INT(_debug, OID_AUTO, ccddebug, CTLFLAG_RW, &ccddebug, 0, "");
|
||
#undef DEBUG
|
||
#endif
|
||
|
||
#define ccdunit(x) dkunit(x)
|
||
#define ccdpart(x) dkpart(x)
|
||
|
||
/*
|
||
This is how mirroring works (only writes are special):
|
||
|
||
When initiating a write, ccdbuffer() returns two "struct ccdbuf *"s
|
||
linked together by the cb_mirror field. "cb_pflags &
|
||
CCDPF_MIRROR_DONE" is set to 0 on both of them.
|
||
|
||
When a component returns to ccdiodone(), it checks if "cb_pflags &
|
||
CCDPF_MIRROR_DONE" is set or not. If not, it sets the partner's
|
||
flag and returns. If it is, it means its partner has already
|
||
returned, so it will go to the regular cleanup.
|
||
|
||
*/
|
||
|
||
struct ccdbuf {
|
||
struct buf cb_buf; /* new I/O buf */
|
||
struct buf *cb_obp; /* ptr. to original I/O buf */
|
||
struct ccdbuf *cb_freenext; /* free list link */
|
||
int cb_unit; /* target unit */
|
||
int cb_comp; /* target component */
|
||
int cb_pflags; /* mirror/parity status flag */
|
||
struct ccdbuf *cb_mirror; /* mirror counterpart */
|
||
};
|
||
|
||
/* bits in cb_pflags */
|
||
#define CCDPF_MIRROR_DONE 1 /* if set, mirror counterpart is done */
|
||
|
||
#define CCDLABELDEV(dev) \
|
||
(makedev(major((dev)), dkmakeminor(ccdunit((dev)), 0, RAW_PART)))
|
||
|
||
static d_open_t ccdopen;
|
||
static d_close_t ccdclose;
|
||
static d_strategy_t ccdstrategy;
|
||
static d_ioctl_t ccdioctl;
|
||
static d_dump_t ccddump;
|
||
static d_psize_t ccdsize;
|
||
|
||
#define NCCDFREEHIWAT 16
|
||
|
||
#define CDEV_MAJOR 74
|
||
#define BDEV_MAJOR 21
|
||
|
||
static struct cdevsw ccd_cdevsw = {
|
||
/* open */ ccdopen,
|
||
/* close */ ccdclose,
|
||
/* read */ physread,
|
||
/* write */ physwrite,
|
||
/* ioctl */ ccdioctl,
|
||
/* poll */ nopoll,
|
||
/* mmap */ nommap,
|
||
/* strategy */ ccdstrategy,
|
||
/* name */ "ccd",
|
||
/* maj */ CDEV_MAJOR,
|
||
/* dump */ ccddump,
|
||
/* psize */ ccdsize,
|
||
/* flags */ D_DISK,
|
||
/* bmaj */ BDEV_MAJOR
|
||
};
|
||
|
||
/* called during module initialization */
|
||
static void ccdattach __P((void));
|
||
static int ccd_modevent __P((module_t, int, void *));
|
||
|
||
/* called by biodone() at interrupt time */
|
||
static void ccdiodone __P((struct ccdbuf *cbp));
|
||
|
||
static void ccdstart __P((struct ccd_softc *, struct buf *));
|
||
static void ccdinterleave __P((struct ccd_softc *, int));
|
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static void ccdintr __P((struct ccd_softc *, struct buf *));
|
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static int ccdinit __P((struct ccddevice *, char **, struct proc *));
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static int ccdlookup __P((char *, struct proc *p, struct vnode **));
|
||
static void ccdbuffer __P((struct ccdbuf **ret, struct ccd_softc *,
|
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struct buf *, daddr_t, caddr_t, long));
|
||
static void ccdgetdisklabel __P((dev_t));
|
||
static void ccdmakedisklabel __P((struct ccd_softc *));
|
||
static int ccdlock __P((struct ccd_softc *));
|
||
static void ccdunlock __P((struct ccd_softc *));
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|
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#ifdef DEBUG
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static void printiinfo __P((struct ccdiinfo *));
|
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#endif
|
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|
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/* Non-private for the benefit of libkvm. */
|
||
struct ccd_softc *ccd_softc;
|
||
struct ccddevice *ccddevs;
|
||
struct ccdbuf *ccdfreebufs;
|
||
static int numccdfreebufs;
|
||
static int numccd = 0;
|
||
|
||
/*
|
||
* getccdbuf() - Allocate and zero a ccd buffer.
|
||
*
|
||
* This routine is called at splbio().
|
||
*/
|
||
|
||
static __inline
|
||
struct ccdbuf *
|
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getccdbuf(struct ccdbuf *cpy)
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{
|
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struct ccdbuf *cbp;
|
||
|
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/*
|
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* Allocate from freelist or malloc as necessary
|
||
*/
|
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if ((cbp = ccdfreebufs) != NULL) {
|
||
ccdfreebufs = cbp->cb_freenext;
|
||
--numccdfreebufs;
|
||
} else {
|
||
cbp = malloc(sizeof(struct ccdbuf), M_DEVBUF, M_WAITOK);
|
||
}
|
||
|
||
/*
|
||
* Used by mirroring code
|
||
*/
|
||
if (cpy)
|
||
bcopy(cpy, cbp, sizeof(struct ccdbuf));
|
||
else
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||
bzero(cbp, sizeof(struct ccdbuf));
|
||
|
||
/*
|
||
* independant struct buf initialization
|
||
*/
|
||
LIST_INIT(&cbp->cb_buf.b_dep);
|
||
BUF_LOCKINIT(&cbp->cb_buf);
|
||
BUF_LOCK(&cbp->cb_buf, LK_EXCLUSIVE);
|
||
BUF_KERNPROC(&cbp->cb_buf);
|
||
|
||
return(cbp);
|
||
}
|
||
|
||
/*
|
||
* putccdbuf() - Free a ccd buffer.
|
||
*
|
||
* This routine is called at splbio().
|
||
*/
|
||
|
||
static __inline
|
||
void
|
||
putccdbuf(struct ccdbuf *cbp)
|
||
{
|
||
BUF_UNLOCK(&cbp->cb_buf);
|
||
BUF_LOCKFREE(&cbp->cb_buf);
|
||
|
||
if (numccdfreebufs < NCCDFREEHIWAT) {
|
||
cbp->cb_freenext = ccdfreebufs;
|
||
ccdfreebufs = cbp;
|
||
++numccdfreebufs;
|
||
} else {
|
||
free((caddr_t)cbp, M_DEVBUF);
|
||
}
|
||
}
|
||
|
||
|
||
/*
|
||
* Number of blocks to untouched in front of a component partition.
|
||
* This is to avoid violating its disklabel area when it starts at the
|
||
* beginning of the slice.
|
||
*/
|
||
#if !defined(CCD_OFFSET)
|
||
#define CCD_OFFSET 16
|
||
#endif
|
||
|
||
/*
|
||
* Called by main() during pseudo-device attachment. All we need
|
||
* to do is allocate enough space for devices to be configured later, and
|
||
* add devsw entries.
|
||
*/
|
||
static void
|
||
ccdattach()
|
||
{
|
||
int i;
|
||
int num = NCCD;
|
||
|
||
if (num > 1)
|
||
printf("ccd0-%d: Concatenated disk drivers\n", num-1);
|
||
else
|
||
printf("ccd0: Concatenated disk driver\n");
|
||
|
||
ccd_softc = (struct ccd_softc *)malloc(num * sizeof(struct ccd_softc),
|
||
M_DEVBUF, M_NOWAIT);
|
||
ccddevs = (struct ccddevice *)malloc(num * sizeof(struct ccddevice),
|
||
M_DEVBUF, M_NOWAIT);
|
||
if ((ccd_softc == NULL) || (ccddevs == NULL)) {
|
||
printf("WARNING: no memory for concatenated disks\n");
|
||
if (ccd_softc != NULL)
|
||
free(ccd_softc, M_DEVBUF);
|
||
if (ccddevs != NULL)
|
||
free(ccddevs, M_DEVBUF);
|
||
return;
|
||
}
|
||
numccd = num;
|
||
bzero(ccd_softc, num * sizeof(struct ccd_softc));
|
||
bzero(ccddevs, num * sizeof(struct ccddevice));
|
||
|
||
cdevsw_add(&ccd_cdevsw);
|
||
/* XXX: is this necessary? */
|
||
for (i = 0; i < numccd; ++i)
|
||
ccddevs[i].ccd_dk = -1;
|
||
}
|
||
|
||
static int
|
||
ccd_modevent(mod, type, data)
|
||
module_t mod;
|
||
int type;
|
||
void *data;
|
||
{
|
||
int error = 0;
|
||
|
||
switch (type) {
|
||
case MOD_LOAD:
|
||
ccdattach();
|
||
break;
|
||
|
||
case MOD_UNLOAD:
|
||
printf("ccd0: Unload not supported!\n");
|
||
error = EOPNOTSUPP;
|
||
break;
|
||
|
||
default: /* MOD_SHUTDOWN etc */
|
||
break;
|
||
}
|
||
return (error);
|
||
}
|
||
|
||
DEV_MODULE(ccd, ccd_modevent, NULL);
|
||
|
||
static int
|
||
ccdinit(ccd, cpaths, p)
|
||
struct ccddevice *ccd;
|
||
char **cpaths;
|
||
struct proc *p;
|
||
{
|
||
struct ccd_softc *cs = &ccd_softc[ccd->ccd_unit];
|
||
struct ccdcinfo *ci = NULL; /* XXX */
|
||
size_t size;
|
||
int ix;
|
||
struct vnode *vp;
|
||
size_t minsize;
|
||
int maxsecsize;
|
||
struct partinfo dpart;
|
||
struct ccdgeom *ccg = &cs->sc_geom;
|
||
char tmppath[MAXPATHLEN];
|
||
int error = 0;
|
||
|
||
#ifdef DEBUG
|
||
if (ccddebug & (CCDB_FOLLOW|CCDB_INIT))
|
||
printf("ccdinit: unit %d\n", ccd->ccd_unit);
|
||
#endif
|
||
|
||
cs->sc_size = 0;
|
||
cs->sc_ileave = ccd->ccd_interleave;
|
||
cs->sc_nccdisks = ccd->ccd_ndev;
|
||
|
||
/* Allocate space for the component info. */
|
||
cs->sc_cinfo = malloc(cs->sc_nccdisks * sizeof(struct ccdcinfo),
|
||
M_DEVBUF, M_WAITOK);
|
||
|
||
/*
|
||
* Verify that each component piece exists and record
|
||
* relevant information about it.
|
||
*/
|
||
maxsecsize = 0;
|
||
minsize = 0;
|
||
for (ix = 0; ix < cs->sc_nccdisks; ix++) {
|
||
vp = ccd->ccd_vpp[ix];
|
||
ci = &cs->sc_cinfo[ix];
|
||
ci->ci_vp = vp;
|
||
|
||
/*
|
||
* Copy in the pathname of the component.
|
||
*/
|
||
bzero(tmppath, sizeof(tmppath)); /* sanity */
|
||
if ((error = copyinstr(cpaths[ix], tmppath,
|
||
MAXPATHLEN, &ci->ci_pathlen)) != 0) {
|
||
#ifdef DEBUG
|
||
if (ccddebug & (CCDB_FOLLOW|CCDB_INIT))
|
||
printf("ccd%d: can't copy path, error = %d\n",
|
||
ccd->ccd_unit, error);
|
||
#endif
|
||
goto fail;
|
||
}
|
||
ci->ci_path = malloc(ci->ci_pathlen, M_DEVBUF, M_WAITOK);
|
||
bcopy(tmppath, ci->ci_path, ci->ci_pathlen);
|
||
|
||
ci->ci_dev = vn_todev(vp);
|
||
|
||
/*
|
||
* Get partition information for the component.
|
||
*/
|
||
if ((error = VOP_IOCTL(vp, DIOCGPART, (caddr_t)&dpart,
|
||
FREAD, p->p_ucred, p)) != 0) {
|
||
#ifdef DEBUG
|
||
if (ccddebug & (CCDB_FOLLOW|CCDB_INIT))
|
||
printf("ccd%d: %s: ioctl failed, error = %d\n",
|
||
ccd->ccd_unit, ci->ci_path, error);
|
||
#endif
|
||
goto fail;
|
||
}
|
||
if (dpart.part->p_fstype == FS_BSDFFS) {
|
||
maxsecsize =
|
||
((dpart.disklab->d_secsize > maxsecsize) ?
|
||
dpart.disklab->d_secsize : maxsecsize);
|
||
size = dpart.part->p_size - CCD_OFFSET;
|
||
} else {
|
||
#ifdef DEBUG
|
||
if (ccddebug & (CCDB_FOLLOW|CCDB_INIT))
|
||
printf("ccd%d: %s: incorrect partition type\n",
|
||
ccd->ccd_unit, ci->ci_path);
|
||
#endif
|
||
error = EFTYPE;
|
||
goto fail;
|
||
}
|
||
|
||
/*
|
||
* Calculate the size, truncating to an interleave
|
||
* boundary if necessary.
|
||
*/
|
||
|
||
if (cs->sc_ileave > 1)
|
||
size -= size % cs->sc_ileave;
|
||
|
||
if (size == 0) {
|
||
#ifdef DEBUG
|
||
if (ccddebug & (CCDB_FOLLOW|CCDB_INIT))
|
||
printf("ccd%d: %s: size == 0\n",
|
||
ccd->ccd_unit, ci->ci_path);
|
||
#endif
|
||
error = ENODEV;
|
||
goto fail;
|
||
}
|
||
|
||
if (minsize == 0 || size < minsize)
|
||
minsize = size;
|
||
ci->ci_size = size;
|
||
cs->sc_size += size;
|
||
}
|
||
|
||
/*
|
||
* Don't allow the interleave to be smaller than
|
||
* the biggest component sector.
|
||
*/
|
||
if ((cs->sc_ileave > 0) &&
|
||
(cs->sc_ileave < (maxsecsize / DEV_BSIZE))) {
|
||
#ifdef DEBUG
|
||
if (ccddebug & (CCDB_FOLLOW|CCDB_INIT))
|
||
printf("ccd%d: interleave must be at least %d\n",
|
||
ccd->ccd_unit, (maxsecsize / DEV_BSIZE));
|
||
#endif
|
||
error = EINVAL;
|
||
goto fail;
|
||
}
|
||
|
||
/*
|
||
* If uniform interleave is desired set all sizes to that of
|
||
* the smallest component. This will guarentee that a single
|
||
* interleave table is generated.
|
||
*
|
||
* Lost space must be taken into account when calculating the
|
||
* overall size. Half the space is lost when CCDF_MIRROR is
|
||
* specified. One disk is lost when CCDF_PARITY is specified.
|
||
*/
|
||
if (ccd->ccd_flags & CCDF_UNIFORM) {
|
||
for (ci = cs->sc_cinfo;
|
||
ci < &cs->sc_cinfo[cs->sc_nccdisks]; ci++) {
|
||
ci->ci_size = minsize;
|
||
}
|
||
if (ccd->ccd_flags & CCDF_MIRROR) {
|
||
/*
|
||
* Check to see if an even number of components
|
||
* have been specified. The interleave must also
|
||
* be non-zero in order for us to be able to
|
||
* guarentee the topology.
|
||
*/
|
||
if (cs->sc_nccdisks % 2) {
|
||
printf("ccd%d: mirroring requires an even number of disks\n", ccd->ccd_unit );
|
||
error = EINVAL;
|
||
goto fail;
|
||
}
|
||
if (cs->sc_ileave == 0) {
|
||
printf("ccd%d: an interleave must be specified when mirroring\n", ccd->ccd_unit);
|
||
error = EINVAL;
|
||
goto fail;
|
||
}
|
||
cs->sc_size = (cs->sc_nccdisks/2) * minsize;
|
||
} else if (ccd->ccd_flags & CCDF_PARITY) {
|
||
cs->sc_size = (cs->sc_nccdisks-1) * minsize;
|
||
} else {
|
||
if (cs->sc_ileave == 0) {
|
||
printf("ccd%d: an interleave must be specified when using parity\n", ccd->ccd_unit);
|
||
error = EINVAL;
|
||
goto fail;
|
||
}
|
||
cs->sc_size = cs->sc_nccdisks * minsize;
|
||
}
|
||
}
|
||
|
||
/*
|
||
* Construct the interleave table.
|
||
*/
|
||
ccdinterleave(cs, ccd->ccd_unit);
|
||
|
||
/*
|
||
* Create pseudo-geometry based on 1MB cylinders. It's
|
||
* pretty close.
|
||
*/
|
||
ccg->ccg_secsize = maxsecsize;
|
||
ccg->ccg_ntracks = 1;
|
||
ccg->ccg_nsectors = 1024 * 1024 / ccg->ccg_secsize;
|
||
ccg->ccg_ncylinders = cs->sc_size / ccg->ccg_nsectors;
|
||
|
||
/*
|
||
* Add an devstat entry for this device.
|
||
*/
|
||
devstat_add_entry(&cs->device_stats, "ccd", ccd->ccd_unit,
|
||
ccg->ccg_secsize, DEVSTAT_ALL_SUPPORTED,
|
||
DEVSTAT_TYPE_STORARRAY |DEVSTAT_TYPE_IF_OTHER,
|
||
DEVSTAT_PRIORITY_ARRAY);
|
||
|
||
cs->sc_flags |= CCDF_INITED;
|
||
cs->sc_cflags = ccd->ccd_flags; /* So we can find out later... */
|
||
cs->sc_unit = ccd->ccd_unit;
|
||
return (0);
|
||
fail:
|
||
while (ci > cs->sc_cinfo) {
|
||
ci--;
|
||
free(ci->ci_path, M_DEVBUF);
|
||
}
|
||
free(cs->sc_cinfo, M_DEVBUF);
|
||
return (error);
|
||
}
|
||
|
||
static void
|
||
ccdinterleave(cs, unit)
|
||
struct ccd_softc *cs;
|
||
int unit;
|
||
{
|
||
struct ccdcinfo *ci, *smallci;
|
||
struct ccdiinfo *ii;
|
||
daddr_t bn, lbn;
|
||
int ix;
|
||
u_long size;
|
||
|
||
#ifdef DEBUG
|
||
if (ccddebug & CCDB_INIT)
|
||
printf("ccdinterleave(%x): ileave %d\n", cs, cs->sc_ileave);
|
||
#endif
|
||
|
||
/*
|
||
* Allocate an interleave table. The worst case occurs when each
|
||
* of N disks is of a different size, resulting in N interleave
|
||
* tables.
|
||
*
|
||
* Chances are this is too big, but we don't care.
|
||
*/
|
||
size = (cs->sc_nccdisks + 1) * sizeof(struct ccdiinfo);
|
||
cs->sc_itable = (struct ccdiinfo *)malloc(size, M_DEVBUF, M_WAITOK);
|
||
bzero((caddr_t)cs->sc_itable, size);
|
||
|
||
/*
|
||
* Trivial case: no interleave (actually interleave of disk size).
|
||
* Each table entry represents a single component in its entirety.
|
||
*
|
||
* An interleave of 0 may not be used with a mirror or parity setup.
|
||
*/
|
||
if (cs->sc_ileave == 0) {
|
||
bn = 0;
|
||
ii = cs->sc_itable;
|
||
|
||
for (ix = 0; ix < cs->sc_nccdisks; ix++) {
|
||
/* Allocate space for ii_index. */
|
||
ii->ii_index = malloc(sizeof(int), M_DEVBUF, M_WAITOK);
|
||
ii->ii_ndisk = 1;
|
||
ii->ii_startblk = bn;
|
||
ii->ii_startoff = 0;
|
||
ii->ii_index[0] = ix;
|
||
bn += cs->sc_cinfo[ix].ci_size;
|
||
ii++;
|
||
}
|
||
ii->ii_ndisk = 0;
|
||
#ifdef DEBUG
|
||
if (ccddebug & CCDB_INIT)
|
||
printiinfo(cs->sc_itable);
|
||
#endif
|
||
return;
|
||
}
|
||
|
||
/*
|
||
* The following isn't fast or pretty; it doesn't have to be.
|
||
*/
|
||
size = 0;
|
||
bn = lbn = 0;
|
||
for (ii = cs->sc_itable; ; ii++) {
|
||
/*
|
||
* Allocate space for ii_index. We might allocate more then
|
||
* we use.
|
||
*/
|
||
ii->ii_index = malloc((sizeof(int) * cs->sc_nccdisks),
|
||
M_DEVBUF, M_WAITOK);
|
||
|
||
/*
|
||
* Locate the smallest of the remaining components
|
||
*/
|
||
smallci = NULL;
|
||
for (ci = cs->sc_cinfo; ci < &cs->sc_cinfo[cs->sc_nccdisks];
|
||
ci++) {
|
||
if (ci->ci_size > size &&
|
||
(smallci == NULL ||
|
||
ci->ci_size < smallci->ci_size)) {
|
||
smallci = ci;
|
||
}
|
||
}
|
||
|
||
/*
|
||
* Nobody left, all done
|
||
*/
|
||
if (smallci == NULL) {
|
||
ii->ii_ndisk = 0;
|
||
break;
|
||
}
|
||
|
||
/*
|
||
* Record starting logical block using an sc_ileave blocksize.
|
||
*/
|
||
ii->ii_startblk = bn / cs->sc_ileave;
|
||
|
||
/*
|
||
* Record starting comopnent block using an sc_ileave
|
||
* blocksize. This value is relative to the beginning of
|
||
* a component disk.
|
||
*/
|
||
ii->ii_startoff = lbn;
|
||
|
||
/*
|
||
* Determine how many disks take part in this interleave
|
||
* and record their indices.
|
||
*/
|
||
ix = 0;
|
||
for (ci = cs->sc_cinfo;
|
||
ci < &cs->sc_cinfo[cs->sc_nccdisks]; ci++) {
|
||
if (ci->ci_size >= smallci->ci_size) {
|
||
ii->ii_index[ix++] = ci - cs->sc_cinfo;
|
||
}
|
||
}
|
||
ii->ii_ndisk = ix;
|
||
bn += ix * (smallci->ci_size - size);
|
||
lbn = smallci->ci_size / cs->sc_ileave;
|
||
size = smallci->ci_size;
|
||
}
|
||
#ifdef DEBUG
|
||
if (ccddebug & CCDB_INIT)
|
||
printiinfo(cs->sc_itable);
|
||
#endif
|
||
}
|
||
|
||
/* ARGSUSED */
|
||
static int
|
||
ccdopen(dev, flags, fmt, p)
|
||
dev_t dev;
|
||
int flags, fmt;
|
||
struct proc *p;
|
||
{
|
||
int unit = ccdunit(dev);
|
||
struct ccd_softc *cs;
|
||
struct disklabel *lp;
|
||
int error = 0, part, pmask;
|
||
|
||
#ifdef DEBUG
|
||
if (ccddebug & CCDB_FOLLOW)
|
||
printf("ccdopen(%x, %x)\n", dev, flags);
|
||
#endif
|
||
if (unit >= numccd)
|
||
return (ENXIO);
|
||
cs = &ccd_softc[unit];
|
||
|
||
if ((error = ccdlock(cs)) != 0)
|
||
return (error);
|
||
|
||
lp = &cs->sc_label;
|
||
|
||
part = ccdpart(dev);
|
||
pmask = (1 << part);
|
||
|
||
/*
|
||
* If we're initialized, check to see if there are any other
|
||
* open partitions. If not, then it's safe to update
|
||
* the in-core disklabel.
|
||
*/
|
||
if ((cs->sc_flags & CCDF_INITED) && (cs->sc_openmask == 0))
|
||
ccdgetdisklabel(dev);
|
||
|
||
/* Check that the partition exists. */
|
||
if (part != RAW_PART && ((part >= lp->d_npartitions) ||
|
||
(lp->d_partitions[part].p_fstype == FS_UNUSED))) {
|
||
error = ENXIO;
|
||
goto done;
|
||
}
|
||
|
||
cs->sc_openmask |= pmask;
|
||
done:
|
||
ccdunlock(cs);
|
||
return (0);
|
||
}
|
||
|
||
/* ARGSUSED */
|
||
static int
|
||
ccdclose(dev, flags, fmt, p)
|
||
dev_t dev;
|
||
int flags, fmt;
|
||
struct proc *p;
|
||
{
|
||
int unit = ccdunit(dev);
|
||
struct ccd_softc *cs;
|
||
int error = 0, part;
|
||
|
||
#ifdef DEBUG
|
||
if (ccddebug & CCDB_FOLLOW)
|
||
printf("ccdclose(%x, %x)\n", dev, flags);
|
||
#endif
|
||
|
||
if (unit >= numccd)
|
||
return (ENXIO);
|
||
cs = &ccd_softc[unit];
|
||
|
||
if ((error = ccdlock(cs)) != 0)
|
||
return (error);
|
||
|
||
part = ccdpart(dev);
|
||
|
||
/* ...that much closer to allowing unconfiguration... */
|
||
cs->sc_openmask &= ~(1 << part);
|
||
ccdunlock(cs);
|
||
return (0);
|
||
}
|
||
|
||
static void
|
||
ccdstrategy(bp)
|
||
struct buf *bp;
|
||
{
|
||
int unit = ccdunit(bp->b_dev);
|
||
struct ccd_softc *cs = &ccd_softc[unit];
|
||
int s;
|
||
int wlabel;
|
||
struct disklabel *lp;
|
||
|
||
#ifdef DEBUG
|
||
if (ccddebug & CCDB_FOLLOW)
|
||
printf("ccdstrategy(%x): unit %d\n", bp, unit);
|
||
#endif
|
||
if ((cs->sc_flags & CCDF_INITED) == 0) {
|
||
bp->b_error = ENXIO;
|
||
bp->b_flags |= B_ERROR;
|
||
goto done;
|
||
}
|
||
|
||
/* If it's a nil transfer, wake up the top half now. */
|
||
if (bp->b_bcount == 0)
|
||
goto done;
|
||
|
||
lp = &cs->sc_label;
|
||
|
||
/*
|
||
* Do bounds checking and adjust transfer. If there's an
|
||
* error, the bounds check will flag that for us.
|
||
*/
|
||
wlabel = cs->sc_flags & (CCDF_WLABEL|CCDF_LABELLING);
|
||
if (ccdpart(bp->b_dev) != RAW_PART) {
|
||
if (bounds_check_with_label(bp, lp, wlabel) <= 0)
|
||
goto done;
|
||
} else {
|
||
int pbn; /* in sc_secsize chunks */
|
||
long sz; /* in sc_secsize chunks */
|
||
|
||
pbn = bp->b_blkno / (cs->sc_geom.ccg_secsize / DEV_BSIZE);
|
||
sz = howmany(bp->b_bcount, cs->sc_geom.ccg_secsize);
|
||
|
||
/*
|
||
* If out of bounds return an error. If at the EOF point,
|
||
* simply read or write less.
|
||
*/
|
||
|
||
if (pbn < 0 || pbn >= cs->sc_size) {
|
||
bp->b_resid = bp->b_bcount;
|
||
if (pbn != cs->sc_size) {
|
||
bp->b_error = EINVAL;
|
||
bp->b_flags |= B_ERROR | B_INVAL;
|
||
}
|
||
goto done;
|
||
}
|
||
|
||
/*
|
||
* If the request crosses EOF, truncate the request.
|
||
*/
|
||
if (pbn + sz > cs->sc_size) {
|
||
bp->b_bcount = (cs->sc_size - pbn) *
|
||
cs->sc_geom.ccg_secsize;
|
||
}
|
||
}
|
||
|
||
bp->b_resid = bp->b_bcount;
|
||
|
||
/*
|
||
* "Start" the unit.
|
||
*/
|
||
s = splbio();
|
||
ccdstart(cs, bp);
|
||
splx(s);
|
||
return;
|
||
done:
|
||
biodone(bp);
|
||
}
|
||
|
||
static void
|
||
ccdstart(cs, bp)
|
||
struct ccd_softc *cs;
|
||
struct buf *bp;
|
||
{
|
||
long bcount, rcount;
|
||
struct ccdbuf *cbp[4];
|
||
/* XXX! : 2 reads and 2 writes for RAID 4/5 */
|
||
caddr_t addr;
|
||
daddr_t bn;
|
||
struct partition *pp;
|
||
|
||
#ifdef DEBUG
|
||
if (ccddebug & CCDB_FOLLOW)
|
||
printf("ccdstart(%x, %x)\n", cs, bp);
|
||
#endif
|
||
|
||
/* Record the transaction start */
|
||
devstat_start_transaction(&cs->device_stats);
|
||
|
||
/*
|
||
* Translate the partition-relative block number to an absolute.
|
||
*/
|
||
bn = bp->b_blkno;
|
||
if (ccdpart(bp->b_dev) != RAW_PART) {
|
||
pp = &cs->sc_label.d_partitions[ccdpart(bp->b_dev)];
|
||
bn += pp->p_offset;
|
||
}
|
||
|
||
/*
|
||
* Allocate component buffers and fire off the requests
|
||
*/
|
||
addr = bp->b_data;
|
||
for (bcount = bp->b_bcount; bcount > 0; bcount -= rcount) {
|
||
ccdbuffer(cbp, cs, bp, bn, addr, bcount);
|
||
rcount = cbp[0]->cb_buf.b_bcount;
|
||
|
||
if (cs->sc_cflags & CCDF_MIRROR) {
|
||
/*
|
||
* Mirroring. Writes go to both disks, reads are
|
||
* taken from whichever disk seems most appropriate.
|
||
*
|
||
* We attempt to localize reads to the disk whos arm
|
||
* is nearest the read request. We ignore seeks due
|
||
* to writes when making this determination and we
|
||
* also try to avoid hogging.
|
||
*/
|
||
if ((cbp[0]->cb_buf.b_flags & B_READ) == 0) {
|
||
cbp[0]->cb_buf.b_vp->v_numoutput++;
|
||
cbp[1]->cb_buf.b_vp->v_numoutput++;
|
||
VOP_STRATEGY(cbp[0]->cb_buf.b_vp,
|
||
&cbp[0]->cb_buf);
|
||
VOP_STRATEGY(cbp[1]->cb_buf.b_vp,
|
||
&cbp[1]->cb_buf);
|
||
} else {
|
||
int pick = cs->sc_pick;
|
||
daddr_t range = cs->sc_size / 16;
|
||
|
||
if (bn < cs->sc_blk[pick] - range ||
|
||
bn > cs->sc_blk[pick] + range
|
||
) {
|
||
cs->sc_pick = pick = 1 - pick;
|
||
}
|
||
cs->sc_blk[pick] = bn + btodb(rcount);
|
||
VOP_STRATEGY(cbp[pick]->cb_buf.b_vp,
|
||
&cbp[pick]->cb_buf);
|
||
}
|
||
} else {
|
||
/*
|
||
* Not mirroring
|
||
*/
|
||
if ((cbp[0]->cb_buf.b_flags & B_READ) == 0)
|
||
cbp[0]->cb_buf.b_vp->v_numoutput++;
|
||
VOP_STRATEGY(cbp[0]->cb_buf.b_vp, &cbp[0]->cb_buf);
|
||
}
|
||
bn += btodb(rcount);
|
||
addr += rcount;
|
||
}
|
||
}
|
||
|
||
/*
|
||
* Build a component buffer header.
|
||
*/
|
||
static void
|
||
ccdbuffer(cb, cs, bp, bn, addr, bcount)
|
||
struct ccdbuf **cb;
|
||
struct ccd_softc *cs;
|
||
struct buf *bp;
|
||
daddr_t bn;
|
||
caddr_t addr;
|
||
long bcount;
|
||
{
|
||
struct ccdcinfo *ci, *ci2 = NULL; /* XXX */
|
||
struct ccdbuf *cbp;
|
||
daddr_t cbn, cboff;
|
||
off_t cbc;
|
||
|
||
#ifdef DEBUG
|
||
if (ccddebug & CCDB_IO)
|
||
printf("ccdbuffer(%x, %x, %d, %x, %d)\n",
|
||
cs, bp, bn, addr, bcount);
|
||
#endif
|
||
/*
|
||
* Determine which component bn falls in.
|
||
*/
|
||
cbn = bn;
|
||
cboff = 0;
|
||
|
||
if (cs->sc_ileave == 0) {
|
||
/*
|
||
* Serially concatenated and neither a mirror nor a parity
|
||
* config. This is a special case.
|
||
*/
|
||
daddr_t sblk;
|
||
|
||
sblk = 0;
|
||
for (ci = cs->sc_cinfo; cbn >= sblk + ci->ci_size; ci++)
|
||
sblk += ci->ci_size;
|
||
cbn -= sblk;
|
||
} else {
|
||
struct ccdiinfo *ii;
|
||
int ccdisk, off;
|
||
|
||
/*
|
||
* Calculate cbn, the logical superblock (sc_ileave chunks),
|
||
* and cboff, a normal block offset (DEV_BSIZE chunks) relative
|
||
* to cbn.
|
||
*/
|
||
cboff = cbn % cs->sc_ileave; /* DEV_BSIZE gran */
|
||
cbn = cbn / cs->sc_ileave; /* DEV_BSIZE * ileave gran */
|
||
|
||
/*
|
||
* Figure out which interleave table to use.
|
||
*/
|
||
for (ii = cs->sc_itable; ii->ii_ndisk; ii++) {
|
||
if (ii->ii_startblk > cbn)
|
||
break;
|
||
}
|
||
ii--;
|
||
|
||
/*
|
||
* off is the logical superblock relative to the beginning
|
||
* of this interleave block.
|
||
*/
|
||
off = cbn - ii->ii_startblk;
|
||
|
||
/*
|
||
* We must calculate which disk component to use (ccdisk),
|
||
* and recalculate cbn to be the superblock relative to
|
||
* the beginning of the component. This is typically done by
|
||
* adding 'off' and ii->ii_startoff together. However, 'off'
|
||
* must typically be divided by the number of components in
|
||
* this interleave array to be properly convert it from a
|
||
* CCD-relative logical superblock number to a
|
||
* component-relative superblock number.
|
||
*/
|
||
if (ii->ii_ndisk == 1) {
|
||
/*
|
||
* When we have just one disk, it can't be a mirror
|
||
* or a parity config.
|
||
*/
|
||
ccdisk = ii->ii_index[0];
|
||
cbn = ii->ii_startoff + off;
|
||
} else {
|
||
if (cs->sc_cflags & CCDF_MIRROR) {
|
||
/*
|
||
* We have forced a uniform mapping, resulting
|
||
* in a single interleave array. We double
|
||
* up on the first half of the available
|
||
* components and our mirror is in the second
|
||
* half. This only works with a single
|
||
* interleave array because doubling up
|
||
* doubles the number of sectors, so there
|
||
* cannot be another interleave array because
|
||
* the next interleave array's calculations
|
||
* would be off.
|
||
*/
|
||
int ndisk2 = ii->ii_ndisk / 2;
|
||
ccdisk = ii->ii_index[off % ndisk2];
|
||
cbn = ii->ii_startoff + off / ndisk2;
|
||
ci2 = &cs->sc_cinfo[ccdisk + ndisk2];
|
||
} else if (cs->sc_cflags & CCDF_PARITY) {
|
||
/*
|
||
* XXX not implemented yet
|
||
*/
|
||
int ndisk2 = ii->ii_ndisk - 1;
|
||
ccdisk = ii->ii_index[off % ndisk2];
|
||
cbn = ii->ii_startoff + off / ndisk2;
|
||
if (cbn % ii->ii_ndisk <= ccdisk)
|
||
ccdisk++;
|
||
} else {
|
||
ccdisk = ii->ii_index[off % ii->ii_ndisk];
|
||
cbn = ii->ii_startoff + off / ii->ii_ndisk;
|
||
}
|
||
}
|
||
|
||
ci = &cs->sc_cinfo[ccdisk];
|
||
|
||
/*
|
||
* Convert cbn from a superblock to a normal block so it
|
||
* can be used to calculate (along with cboff) the normal
|
||
* block index into this particular disk.
|
||
*/
|
||
cbn *= cs->sc_ileave;
|
||
}
|
||
|
||
/*
|
||
* Fill in the component buf structure.
|
||
*/
|
||
cbp = getccdbuf(NULL);
|
||
cbp->cb_buf.b_flags = bp->b_flags | B_CALL;
|
||
cbp->cb_buf.b_iodone = (void (*)(struct buf *))ccdiodone;
|
||
cbp->cb_buf.b_dev = ci->ci_dev; /* XXX */
|
||
cbp->cb_buf.b_blkno = cbn + cboff + CCD_OFFSET;
|
||
cbp->cb_buf.b_offset = dbtob(cbn + cboff + CCD_OFFSET);
|
||
cbp->cb_buf.b_data = addr;
|
||
cbp->cb_buf.b_vp = ci->ci_vp;
|
||
if (cs->sc_ileave == 0)
|
||
cbc = dbtob((off_t)(ci->ci_size - cbn));
|
||
else
|
||
cbc = dbtob((off_t)(cs->sc_ileave - cboff));
|
||
cbp->cb_buf.b_bcount = (cbc < bcount) ? cbc : bcount;
|
||
cbp->cb_buf.b_bufsize = cbp->cb_buf.b_bcount;
|
||
|
||
/*
|
||
* context for ccdiodone
|
||
*/
|
||
cbp->cb_obp = bp;
|
||
cbp->cb_unit = cs - ccd_softc;
|
||
cbp->cb_comp = ci - cs->sc_cinfo;
|
||
|
||
#ifdef DEBUG
|
||
if (ccddebug & CCDB_IO)
|
||
printf(" dev %x(u%d): cbp %x bn %d addr %x bcnt %d\n",
|
||
ci->ci_dev, ci-cs->sc_cinfo, cbp, cbp->cb_buf.b_blkno,
|
||
cbp->cb_buf.b_data, cbp->cb_buf.b_bcount);
|
||
#endif
|
||
cb[0] = cbp;
|
||
|
||
/*
|
||
* Note: both I/O's setup when reading from mirror, but only one
|
||
* will be executed.
|
||
*/
|
||
if (cs->sc_cflags & CCDF_MIRROR) {
|
||
/* mirror, setup second I/O */
|
||
cbp = getccdbuf(cb[0]);
|
||
cbp->cb_buf.b_dev = ci2->ci_dev;
|
||
cbp->cb_buf.b_vp = ci2->ci_vp;
|
||
cbp->cb_comp = ci2 - cs->sc_cinfo;
|
||
cb[1] = cbp;
|
||
/* link together the ccdbuf's and clear "mirror done" flag */
|
||
cb[0]->cb_mirror = cb[1];
|
||
cb[1]->cb_mirror = cb[0];
|
||
cb[0]->cb_pflags &= ~CCDPF_MIRROR_DONE;
|
||
cb[1]->cb_pflags &= ~CCDPF_MIRROR_DONE;
|
||
}
|
||
}
|
||
|
||
static void
|
||
ccdintr(cs, bp)
|
||
struct ccd_softc *cs;
|
||
struct buf *bp;
|
||
{
|
||
#ifdef DEBUG
|
||
if (ccddebug & CCDB_FOLLOW)
|
||
printf("ccdintr(%x, %x)\n", cs, bp);
|
||
#endif
|
||
/*
|
||
* Request is done for better or worse, wakeup the top half.
|
||
*/
|
||
if (bp->b_flags & B_ERROR)
|
||
bp->b_resid = bp->b_bcount;
|
||
devstat_end_transaction_buf(&cs->device_stats, bp);
|
||
biodone(bp);
|
||
}
|
||
|
||
/*
|
||
* Called at interrupt time.
|
||
* Mark the component as done and if all components are done,
|
||
* take a ccd interrupt.
|
||
*/
|
||
static void
|
||
ccdiodone(cbp)
|
||
struct ccdbuf *cbp;
|
||
{
|
||
struct buf *bp = cbp->cb_obp;
|
||
int unit = cbp->cb_unit;
|
||
int count, s;
|
||
|
||
s = splbio();
|
||
#ifdef DEBUG
|
||
if (ccddebug & CCDB_FOLLOW)
|
||
printf("ccdiodone(%x)\n", cbp);
|
||
if (ccddebug & CCDB_IO) {
|
||
printf("ccdiodone: bp %x bcount %d resid %d\n",
|
||
bp, bp->b_bcount, bp->b_resid);
|
||
printf(" dev %x(u%d), cbp %x bn %d addr %x bcnt %d\n",
|
||
cbp->cb_buf.b_dev, cbp->cb_comp, cbp,
|
||
cbp->cb_buf.b_blkno, cbp->cb_buf.b_data,
|
||
cbp->cb_buf.b_bcount);
|
||
}
|
||
#endif
|
||
/*
|
||
* If an error occured, report it. If this is a mirrored
|
||
* configuration and the first of two possible reads, do not
|
||
* set the error in the bp yet because the second read may
|
||
* succeed.
|
||
*/
|
||
|
||
if (cbp->cb_buf.b_flags & B_ERROR) {
|
||
const char *msg = "";
|
||
|
||
if ((ccd_softc[unit].sc_cflags & CCDF_MIRROR) &&
|
||
(cbp->cb_buf.b_flags & B_READ) &&
|
||
(cbp->cb_pflags & CCDPF_MIRROR_DONE) == 0) {
|
||
/*
|
||
* We will try our read on the other disk down
|
||
* below, also reverse the default pick so if we
|
||
* are doing a scan we do not keep hitting the
|
||
* bad disk first.
|
||
*/
|
||
struct ccd_softc *cs = &ccd_softc[unit];
|
||
|
||
msg = ", trying other disk";
|
||
cs->sc_pick = 1 - cs->sc_pick;
|
||
cs->sc_blk[cs->sc_pick] = bp->b_blkno;
|
||
} else {
|
||
bp->b_flags |= B_ERROR;
|
||
bp->b_error = cbp->cb_buf.b_error ?
|
||
cbp->cb_buf.b_error : EIO;
|
||
}
|
||
printf("ccd%d: error %d on component %d block %d (ccd block %d)%s\n",
|
||
unit, bp->b_error, cbp->cb_comp,
|
||
(int)cbp->cb_buf.b_blkno, bp->b_blkno, msg);
|
||
}
|
||
|
||
/*
|
||
* Process mirror. If we are writing, I/O has been initiated on both
|
||
* buffers and we fall through only after both are finished.
|
||
*
|
||
* If we are reading only one I/O is initiated at a time. If an
|
||
* error occurs we initiate the second I/O and return, otherwise
|
||
* we free the second I/O without initiating it.
|
||
*/
|
||
|
||
if (ccd_softc[unit].sc_cflags & CCDF_MIRROR) {
|
||
if ((cbp->cb_buf.b_flags & B_READ) == 0) {
|
||
/*
|
||
* When writing, handshake with the second buffer
|
||
* to determine when both are done. If both are not
|
||
* done, return here.
|
||
*/
|
||
if ((cbp->cb_pflags & CCDPF_MIRROR_DONE) == 0) {
|
||
cbp->cb_mirror->cb_pflags |= CCDPF_MIRROR_DONE;
|
||
putccdbuf(cbp);
|
||
splx(s);
|
||
return;
|
||
}
|
||
} else {
|
||
/*
|
||
* When reading, either dispose of the second buffer
|
||
* or initiate I/O on the second buffer if an error
|
||
* occured with this one.
|
||
*/
|
||
if ((cbp->cb_pflags & CCDPF_MIRROR_DONE) == 0) {
|
||
if (cbp->cb_buf.b_flags & B_ERROR) {
|
||
cbp->cb_mirror->cb_pflags |=
|
||
CCDPF_MIRROR_DONE;
|
||
VOP_STRATEGY(
|
||
cbp->cb_mirror->cb_buf.b_vp,
|
||
&cbp->cb_mirror->cb_buf
|
||
);
|
||
putccdbuf(cbp);
|
||
splx(s);
|
||
return;
|
||
} else {
|
||
putccdbuf(cbp->cb_mirror);
|
||
/* fall through */
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
/*
|
||
* use b_bufsize to determine how big the original request was rather
|
||
* then b_bcount, because b_bcount may have been truncated for EOF.
|
||
*
|
||
* XXX We check for an error, but we do not test the resid for an
|
||
* aligned EOF condition. This may result in character & block
|
||
* device access not recognizing EOF properly when read or written
|
||
* sequentially, but will not effect filesystems.
|
||
*/
|
||
count = cbp->cb_buf.b_bufsize;
|
||
putccdbuf(cbp);
|
||
|
||
/*
|
||
* If all done, "interrupt".
|
||
*/
|
||
bp->b_resid -= count;
|
||
if (bp->b_resid < 0)
|
||
panic("ccdiodone: count");
|
||
if (bp->b_resid == 0)
|
||
ccdintr(&ccd_softc[unit], bp);
|
||
splx(s);
|
||
}
|
||
|
||
static int
|
||
ccdioctl(dev, cmd, data, flag, p)
|
||
dev_t dev;
|
||
u_long cmd;
|
||
caddr_t data;
|
||
int flag;
|
||
struct proc *p;
|
||
{
|
||
int unit = ccdunit(dev);
|
||
int i, j, lookedup = 0, error = 0;
|
||
int part, pmask, s;
|
||
struct ccd_softc *cs;
|
||
struct ccd_ioctl *ccio = (struct ccd_ioctl *)data;
|
||
struct ccddevice ccd;
|
||
char **cpp;
|
||
struct vnode **vpp;
|
||
|
||
if (unit >= numccd)
|
||
return (ENXIO);
|
||
cs = &ccd_softc[unit];
|
||
|
||
bzero(&ccd, sizeof(ccd));
|
||
|
||
switch (cmd) {
|
||
case CCDIOCSET:
|
||
if (cs->sc_flags & CCDF_INITED)
|
||
return (EBUSY);
|
||
|
||
if ((flag & FWRITE) == 0)
|
||
return (EBADF);
|
||
|
||
if ((error = ccdlock(cs)) != 0)
|
||
return (error);
|
||
|
||
/* Fill in some important bits. */
|
||
ccd.ccd_unit = unit;
|
||
ccd.ccd_interleave = ccio->ccio_ileave;
|
||
if (ccd.ccd_interleave == 0 &&
|
||
((ccio->ccio_flags & CCDF_MIRROR) ||
|
||
(ccio->ccio_flags & CCDF_PARITY))) {
|
||
printf("ccd%d: disabling mirror/parity, interleave is 0\n", unit);
|
||
ccio->ccio_flags &= ~(CCDF_MIRROR | CCDF_PARITY);
|
||
}
|
||
if ((ccio->ccio_flags & CCDF_MIRROR) &&
|
||
(ccio->ccio_flags & CCDF_PARITY)) {
|
||
printf("ccd%d: can't specify both mirror and parity, using mirror\n", unit);
|
||
ccio->ccio_flags &= ~CCDF_PARITY;
|
||
}
|
||
if ((ccio->ccio_flags & (CCDF_MIRROR | CCDF_PARITY)) &&
|
||
!(ccio->ccio_flags & CCDF_UNIFORM)) {
|
||
printf("ccd%d: mirror/parity forces uniform flag\n",
|
||
unit);
|
||
ccio->ccio_flags |= CCDF_UNIFORM;
|
||
}
|
||
ccd.ccd_flags = ccio->ccio_flags & CCDF_USERMASK;
|
||
|
||
/*
|
||
* Allocate space for and copy in the array of
|
||
* componet pathnames and device numbers.
|
||
*/
|
||
cpp = malloc(ccio->ccio_ndisks * sizeof(char *),
|
||
M_DEVBUF, M_WAITOK);
|
||
vpp = malloc(ccio->ccio_ndisks * sizeof(struct vnode *),
|
||
M_DEVBUF, M_WAITOK);
|
||
|
||
error = copyin((caddr_t)ccio->ccio_disks, (caddr_t)cpp,
|
||
ccio->ccio_ndisks * sizeof(char **));
|
||
if (error) {
|
||
free(vpp, M_DEVBUF);
|
||
free(cpp, M_DEVBUF);
|
||
ccdunlock(cs);
|
||
return (error);
|
||
}
|
||
|
||
#ifdef DEBUG
|
||
if (ccddebug & CCDB_INIT)
|
||
for (i = 0; i < ccio->ccio_ndisks; ++i)
|
||
printf("ccdioctl: component %d: 0x%x\n",
|
||
i, cpp[i]);
|
||
#endif
|
||
|
||
for (i = 0; i < ccio->ccio_ndisks; ++i) {
|
||
#ifdef DEBUG
|
||
if (ccddebug & CCDB_INIT)
|
||
printf("ccdioctl: lookedup = %d\n", lookedup);
|
||
#endif
|
||
if ((error = ccdlookup(cpp[i], p, &vpp[i])) != 0) {
|
||
for (j = 0; j < lookedup; ++j)
|
||
(void)vn_close(vpp[j], FREAD|FWRITE,
|
||
p->p_ucred, p);
|
||
free(vpp, M_DEVBUF);
|
||
free(cpp, M_DEVBUF);
|
||
ccdunlock(cs);
|
||
return (error);
|
||
}
|
||
++lookedup;
|
||
}
|
||
ccd.ccd_cpp = cpp;
|
||
ccd.ccd_vpp = vpp;
|
||
ccd.ccd_ndev = ccio->ccio_ndisks;
|
||
|
||
/*
|
||
* Initialize the ccd. Fills in the softc for us.
|
||
*/
|
||
if ((error = ccdinit(&ccd, cpp, p)) != 0) {
|
||
for (j = 0; j < lookedup; ++j)
|
||
(void)vn_close(vpp[j], FREAD|FWRITE,
|
||
p->p_ucred, p);
|
||
bzero(&ccd_softc[unit], sizeof(struct ccd_softc));
|
||
free(vpp, M_DEVBUF);
|
||
free(cpp, M_DEVBUF);
|
||
ccdunlock(cs);
|
||
return (error);
|
||
}
|
||
|
||
/*
|
||
* The ccd has been successfully initialized, so
|
||
* we can place it into the array and read the disklabel.
|
||
*/
|
||
bcopy(&ccd, &ccddevs[unit], sizeof(ccd));
|
||
ccio->ccio_unit = unit;
|
||
ccio->ccio_size = cs->sc_size;
|
||
ccdgetdisklabel(dev);
|
||
|
||
ccdunlock(cs);
|
||
|
||
break;
|
||
|
||
case CCDIOCCLR:
|
||
if ((cs->sc_flags & CCDF_INITED) == 0)
|
||
return (ENXIO);
|
||
|
||
if ((flag & FWRITE) == 0)
|
||
return (EBADF);
|
||
|
||
if ((error = ccdlock(cs)) != 0)
|
||
return (error);
|
||
|
||
/* Don't unconfigure if any other partitions are open */
|
||
part = ccdpart(dev);
|
||
pmask = (1 << part);
|
||
if ((cs->sc_openmask & ~pmask)) {
|
||
ccdunlock(cs);
|
||
return (EBUSY);
|
||
}
|
||
|
||
/*
|
||
* Free ccd_softc information and clear entry.
|
||
*/
|
||
|
||
/* Close the components and free their pathnames. */
|
||
for (i = 0; i < cs->sc_nccdisks; ++i) {
|
||
/*
|
||
* XXX: this close could potentially fail and
|
||
* cause Bad Things. Maybe we need to force
|
||
* the close to happen?
|
||
*/
|
||
#ifdef DEBUG
|
||
if (ccddebug & CCDB_VNODE)
|
||
vprint("CCDIOCCLR: vnode info",
|
||
cs->sc_cinfo[i].ci_vp);
|
||
#endif
|
||
(void)vn_close(cs->sc_cinfo[i].ci_vp, FREAD|FWRITE,
|
||
p->p_ucred, p);
|
||
free(cs->sc_cinfo[i].ci_path, M_DEVBUF);
|
||
}
|
||
|
||
/* Free interleave index. */
|
||
for (i = 0; cs->sc_itable[i].ii_ndisk; ++i)
|
||
free(cs->sc_itable[i].ii_index, M_DEVBUF);
|
||
|
||
/* Free component info and interleave table. */
|
||
free(cs->sc_cinfo, M_DEVBUF);
|
||
free(cs->sc_itable, M_DEVBUF);
|
||
cs->sc_flags &= ~CCDF_INITED;
|
||
|
||
/*
|
||
* Free ccddevice information and clear entry.
|
||
*/
|
||
free(ccddevs[unit].ccd_cpp, M_DEVBUF);
|
||
free(ccddevs[unit].ccd_vpp, M_DEVBUF);
|
||
ccd.ccd_dk = -1;
|
||
bcopy(&ccd, &ccddevs[unit], sizeof(ccd));
|
||
|
||
/*
|
||
* And remove the devstat entry.
|
||
*/
|
||
devstat_remove_entry(&cs->device_stats);
|
||
|
||
/* This must be atomic. */
|
||
s = splhigh();
|
||
ccdunlock(cs);
|
||
bzero(cs, sizeof(struct ccd_softc));
|
||
splx(s);
|
||
|
||
break;
|
||
|
||
case DIOCGDINFO:
|
||
if ((cs->sc_flags & CCDF_INITED) == 0)
|
||
return (ENXIO);
|
||
|
||
*(struct disklabel *)data = cs->sc_label;
|
||
break;
|
||
|
||
case DIOCGPART:
|
||
if ((cs->sc_flags & CCDF_INITED) == 0)
|
||
return (ENXIO);
|
||
|
||
((struct partinfo *)data)->disklab = &cs->sc_label;
|
||
((struct partinfo *)data)->part =
|
||
&cs->sc_label.d_partitions[ccdpart(dev)];
|
||
break;
|
||
|
||
case DIOCWDINFO:
|
||
case DIOCSDINFO:
|
||
if ((cs->sc_flags & CCDF_INITED) == 0)
|
||
return (ENXIO);
|
||
|
||
if ((flag & FWRITE) == 0)
|
||
return (EBADF);
|
||
|
||
if ((error = ccdlock(cs)) != 0)
|
||
return (error);
|
||
|
||
cs->sc_flags |= CCDF_LABELLING;
|
||
|
||
error = setdisklabel(&cs->sc_label,
|
||
(struct disklabel *)data, 0);
|
||
if (error == 0) {
|
||
if (cmd == DIOCWDINFO)
|
||
error = writedisklabel(CCDLABELDEV(dev),
|
||
&cs->sc_label);
|
||
}
|
||
|
||
cs->sc_flags &= ~CCDF_LABELLING;
|
||
|
||
ccdunlock(cs);
|
||
|
||
if (error)
|
||
return (error);
|
||
break;
|
||
|
||
case DIOCWLABEL:
|
||
if ((cs->sc_flags & CCDF_INITED) == 0)
|
||
return (ENXIO);
|
||
|
||
if ((flag & FWRITE) == 0)
|
||
return (EBADF);
|
||
if (*(int *)data != 0)
|
||
cs->sc_flags |= CCDF_WLABEL;
|
||
else
|
||
cs->sc_flags &= ~CCDF_WLABEL;
|
||
break;
|
||
|
||
default:
|
||
return (ENOTTY);
|
||
}
|
||
|
||
return (0);
|
||
}
|
||
|
||
static int
|
||
ccdsize(dev)
|
||
dev_t dev;
|
||
{
|
||
struct ccd_softc *cs;
|
||
int part, size;
|
||
|
||
if (ccdopen(dev, 0, S_IFCHR, curproc))
|
||
return (-1);
|
||
|
||
cs = &ccd_softc[ccdunit(dev)];
|
||
part = ccdpart(dev);
|
||
|
||
if ((cs->sc_flags & CCDF_INITED) == 0)
|
||
return (-1);
|
||
|
||
if (cs->sc_label.d_partitions[part].p_fstype != FS_SWAP)
|
||
size = -1;
|
||
else
|
||
size = cs->sc_label.d_partitions[part].p_size;
|
||
|
||
if (ccdclose(dev, 0, S_IFCHR, curproc))
|
||
return (-1);
|
||
|
||
return (size);
|
||
}
|
||
|
||
static int
|
||
ccddump(dev)
|
||
dev_t dev;
|
||
{
|
||
|
||
/* Not implemented. */
|
||
return ENXIO;
|
||
}
|
||
|
||
/*
|
||
* Lookup the provided name in the filesystem. If the file exists,
|
||
* is a valid block device, and isn't being used by anyone else,
|
||
* set *vpp to the file's vnode.
|
||
*/
|
||
static int
|
||
ccdlookup(path, p, vpp)
|
||
char *path;
|
||
struct proc *p;
|
||
struct vnode **vpp; /* result */
|
||
{
|
||
struct nameidata nd;
|
||
struct vnode *vp;
|
||
int error;
|
||
|
||
NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, path, p);
|
||
if ((error = vn_open(&nd, FREAD|FWRITE, 0)) != 0) {
|
||
#ifdef DEBUG
|
||
if (ccddebug & CCDB_FOLLOW|CCDB_INIT)
|
||
printf("ccdlookup: vn_open error = %d\n", error);
|
||
#endif
|
||
return (error);
|
||
}
|
||
vp = nd.ni_vp;
|
||
|
||
if (vp->v_usecount > 1) {
|
||
error = EBUSY;
|
||
goto bad;
|
||
}
|
||
|
||
if (!vn_isdisk(vp, &error))
|
||
goto bad;
|
||
|
||
#ifdef DEBUG
|
||
if (ccddebug & CCDB_VNODE)
|
||
vprint("ccdlookup: vnode info", vp);
|
||
#endif
|
||
|
||
VOP_UNLOCK(vp, 0, p);
|
||
NDFREE(&nd, NDF_ONLY_PNBUF);
|
||
*vpp = vp;
|
||
return (0);
|
||
bad:
|
||
VOP_UNLOCK(vp, 0, p);
|
||
NDFREE(&nd, NDF_ONLY_PNBUF);
|
||
/* vn_close does vrele() for vp */
|
||
(void)vn_close(vp, FREAD|FWRITE, p->p_ucred, p);
|
||
return (error);
|
||
}
|
||
|
||
/*
|
||
* Read the disklabel from the ccd. If one is not present, fake one
|
||
* up.
|
||
*/
|
||
static void
|
||
ccdgetdisklabel(dev)
|
||
dev_t dev;
|
||
{
|
||
int unit = ccdunit(dev);
|
||
struct ccd_softc *cs = &ccd_softc[unit];
|
||
char *errstring;
|
||
struct disklabel *lp = &cs->sc_label;
|
||
struct ccdgeom *ccg = &cs->sc_geom;
|
||
|
||
bzero(lp, sizeof(*lp));
|
||
|
||
lp->d_secperunit = cs->sc_size;
|
||
lp->d_secsize = ccg->ccg_secsize;
|
||
lp->d_nsectors = ccg->ccg_nsectors;
|
||
lp->d_ntracks = ccg->ccg_ntracks;
|
||
lp->d_ncylinders = ccg->ccg_ncylinders;
|
||
lp->d_secpercyl = lp->d_ntracks * lp->d_nsectors;
|
||
|
||
strncpy(lp->d_typename, "ccd", sizeof(lp->d_typename));
|
||
lp->d_type = DTYPE_CCD;
|
||
strncpy(lp->d_packname, "fictitious", sizeof(lp->d_packname));
|
||
lp->d_rpm = 3600;
|
||
lp->d_interleave = 1;
|
||
lp->d_flags = 0;
|
||
|
||
lp->d_partitions[RAW_PART].p_offset = 0;
|
||
lp->d_partitions[RAW_PART].p_size = cs->sc_size;
|
||
lp->d_partitions[RAW_PART].p_fstype = FS_UNUSED;
|
||
lp->d_npartitions = RAW_PART + 1;
|
||
|
||
lp->d_bbsize = BBSIZE; /* XXX */
|
||
lp->d_sbsize = SBSIZE; /* XXX */
|
||
|
||
lp->d_magic = DISKMAGIC;
|
||
lp->d_magic2 = DISKMAGIC;
|
||
lp->d_checksum = dkcksum(&cs->sc_label);
|
||
|
||
/*
|
||
* Call the generic disklabel extraction routine.
|
||
*/
|
||
errstring = readdisklabel(CCDLABELDEV(dev), &cs->sc_label);
|
||
if (errstring != NULL)
|
||
ccdmakedisklabel(cs);
|
||
|
||
#ifdef DEBUG
|
||
/* It's actually extremely common to have unlabeled ccds. */
|
||
if (ccddebug & CCDB_LABEL)
|
||
if (errstring != NULL)
|
||
printf("ccd%d: %s\n", unit, errstring);
|
||
#endif
|
||
}
|
||
|
||
/*
|
||
* Take care of things one might want to take care of in the event
|
||
* that a disklabel isn't present.
|
||
*/
|
||
static void
|
||
ccdmakedisklabel(cs)
|
||
struct ccd_softc *cs;
|
||
{
|
||
struct disklabel *lp = &cs->sc_label;
|
||
|
||
/*
|
||
* For historical reasons, if there's no disklabel present
|
||
* the raw partition must be marked FS_BSDFFS.
|
||
*/
|
||
lp->d_partitions[RAW_PART].p_fstype = FS_BSDFFS;
|
||
|
||
strncpy(lp->d_packname, "default label", sizeof(lp->d_packname));
|
||
}
|
||
|
||
/*
|
||
* Wait interruptibly for an exclusive lock.
|
||
*
|
||
* XXX
|
||
* Several drivers do this; it should be abstracted and made MP-safe.
|
||
*/
|
||
static int
|
||
ccdlock(cs)
|
||
struct ccd_softc *cs;
|
||
{
|
||
int error;
|
||
|
||
while ((cs->sc_flags & CCDF_LOCKED) != 0) {
|
||
cs->sc_flags |= CCDF_WANTED;
|
||
if ((error = tsleep(cs, PRIBIO | PCATCH, "ccdlck", 0)) != 0)
|
||
return (error);
|
||
}
|
||
cs->sc_flags |= CCDF_LOCKED;
|
||
return (0);
|
||
}
|
||
|
||
/*
|
||
* Unlock and wake up any waiters.
|
||
*/
|
||
static void
|
||
ccdunlock(cs)
|
||
struct ccd_softc *cs;
|
||
{
|
||
|
||
cs->sc_flags &= ~CCDF_LOCKED;
|
||
if ((cs->sc_flags & CCDF_WANTED) != 0) {
|
||
cs->sc_flags &= ~CCDF_WANTED;
|
||
wakeup(cs);
|
||
}
|
||
}
|
||
|
||
#ifdef DEBUG
|
||
static void
|
||
printiinfo(ii)
|
||
struct ccdiinfo *ii;
|
||
{
|
||
int ix, i;
|
||
|
||
for (ix = 0; ii->ii_ndisk; ix++, ii++) {
|
||
printf(" itab[%d]: #dk %d sblk %d soff %d",
|
||
ix, ii->ii_ndisk, ii->ii_startblk, ii->ii_startoff);
|
||
for (i = 0; i < ii->ii_ndisk; i++)
|
||
printf(" %d", ii->ii_index[i]);
|
||
printf("\n");
|
||
}
|
||
}
|
||
#endif
|
||
|
||
|
||
/* Local Variables: */
|
||
/* c-argdecl-indent: 8 */
|
||
/* c-continued-statement-offset: 8 */
|
||
/* c-indent-level: 8 */
|
||
/* End: */
|