* Copyright (c) 1996, 1997, 1998, 1999, 2002, 2008 The NetBSD Foundation, Inc.

/* $NetBSD: dksubr.c,v 1.118 2025/02/18 17:09:34 mlelstv Exp $ */

/*-
* Copyright (c) 1996, 1997, 1998, 1999, 2002, 2008 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Jason R. Thorpe and Roland C. Dowdeswell.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: dksubr.c,v 1.118 2025/02/18 17:09:34 mlelstv Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/stat.h>
#include <sys/proc.h>
#include <sys/ioctl.h>
#include <sys/device.h>
#include <sys/disk.h>
#include <sys/disklabel.h>
#include <sys/buf.h>
#include <sys/bufq.h>
#include <sys/vnode.h>
#include <sys/fcntl.h>
#include <sys/namei.h>
#include <sys/module.h>
#include <sys/syslog.h>

#include <dev/dkvar.h>
#include <miscfs/specfs/specdev.h> /* for v_rdev */

int dkdebug = 0;

#ifdef DEBUG
#define DKDB_FOLLOW 0x1
#define DKDB_INIT 0x2
#define DKDB_VNODE 0x4
#define DKDB_DUMP 0x8

#define IFDEBUG(x,y) if (dkdebug & (x)) y
#define DPRINTF(x,y) IFDEBUG(x, printf y)
#define DPRINTF_FOLLOW(y) DPRINTF(DKDB_FOLLOW, y)
#else
#define IFDEBUG(x,y)
#define DPRINTF(x,y)
#define DPRINTF_FOLLOW(y)
#endif

#define DKF_READYFORDUMP (DKF_INITED|DKF_TAKEDUMP)

static int dk_subr_modcmd(modcmd_t, void *);

#define DKLABELDEV(dev) \
(MAKEDISKDEV(major((dev)), DISKUNIT((dev)), RAW_PART))

static void dk_makedisklabel(struct dk_softc *);
static int dk_translate(struct dk_softc *, struct buf *);

void
dk_init(struct dk_softc *dksc, device_t dev, int dtype)
{

memset(dksc, 0x0, sizeof(*dksc));
dksc->sc_dtype = dtype;
dksc->sc_dev = dev;

strlcpy(dksc->sc_xname, device_xname(dev), DK_XNAME_SIZE);
dksc->sc_dkdev.dk_name = dksc->sc_xname;
}

void
dk_attach(struct dk_softc *dksc)
{
KASSERT(dksc->sc_dev != NULL);

mutex_init(&dksc->sc_iolock, MUTEX_DEFAULT, IPL_VM);
dksc->sc_flags |= DKF_READYFORDUMP;
#ifdef DIAGNOSTIC
dksc->sc_flags |= DKF_WARNLABEL | DKF_LABELSANITY;
#endif

if ((dksc->sc_flags & DKF_NO_RND) == 0) {
/* Attach the device into the rnd source list. */
rnd_attach_source(&dksc->sc_rnd_source, dksc->sc_xname,
RND_TYPE_DISK, RND_FLAG_DEFAULT);
}
}

void
dk_detach(struct dk_softc *dksc)
{
if ((dksc->sc_flags & DKF_NO_RND) == 0) {
/* Unhook the entropy source. */
rnd_detach_source(&dksc->sc_rnd_source);
}

dksc->sc_flags &= ~DKF_READYFORDUMP;
mutex_destroy(&dksc->sc_iolock);
}

/* ARGSUSED */
int
dk_open(struct dk_softc *dksc, dev_t dev,
int flags, int fmt, struct lwp *l)
{
const struct dkdriver *dkd = dksc->sc_dkdev.dk_driver;
struct disklabel *lp = dksc->sc_dkdev.dk_label;
int part = DISKPART(dev);
int pmask = 1 << part;
int ret = 0;
struct disk *dk = &dksc->sc_dkdev;

DPRINTF_FOLLOW(("%s(%s, %p, 0x%"PRIx64", 0x%x)\n", __func__,
dksc->sc_xname, dksc, dev, flags));

mutex_enter(&dk->dk_openlock);

/*
* If there are wedges, and this is not RAW_PART, then we
* need to fail.
*/
if (dk->dk_nwedges != 0 && part != RAW_PART) {
ret = EBUSY;
goto done;
}

/* If no dkdriver attached, bail */
if (dkd == NULL) {
ret = ENXIO;
goto done;
}

/*
* initialize driver for the first opener
*/
if (dk->dk_openmask == 0 && dkd->d_firstopen != NULL) {
ret = (*dkd->d_firstopen)(dksc->sc_dev, dev, flags, fmt);
if (ret)
goto done;
}

/*
* If we're init'ed and there are no other open partitions then
* update the in-core disklabel.
*/
if ((dksc->sc_flags & DKF_INITED)) {
if ((dksc->sc_flags & DKF_VLABEL) == 0) {
dksc->sc_flags |= DKF_VLABEL;
dk_getdisklabel(dksc, dev);
}
}

/* Fail if we can't find the partition. */
if (part != RAW_PART &&
((dksc->sc_flags & DKF_VLABEL) == 0 ||
part >= lp->d_npartitions ||
lp->d_partitions[part].p_fstype == FS_UNUSED)) {
ret = ENXIO;
goto done;
}

/* Mark our unit as open. */
switch (fmt) {
case S_IFCHR:
dk->dk_copenmask |= pmask;
break;
case S_IFBLK:
dk->dk_bopenmask |= pmask;
break;
}

dk->dk_openmask = dk->dk_copenmask | dk->dk_bopenmask;

done:
mutex_exit(&dk->dk_openlock);
return ret;
}

/* ARGSUSED */
int
dk_close(struct dk_softc *dksc, dev_t dev,
int flags, int fmt, struct lwp *l)
{
const struct dkdriver *dkd = dksc->sc_dkdev.dk_driver;
int part = DISKPART(dev);
int pmask = 1 << part;
struct disk *dk = &dksc->sc_dkdev;

DPRINTF_FOLLOW(("%s(%s, %p, 0x%"PRIx64", 0x%x)\n", __func__,
dksc->sc_xname, dksc, dev, flags));

mutex_enter(&dk->dk_openlock);

switch (fmt) {
case S_IFCHR:
dk->dk_copenmask &= ~pmask;
break;
case S_IFBLK:
dk->dk_bopenmask &= ~pmask;
break;
}
dk->dk_openmask = dk->dk_copenmask | dk->dk_bopenmask;

if (dk->dk_openmask == 0) {
if (dkd->d_lastclose != NULL)
(*dkd->d_lastclose)(dksc->sc_dev);
if ((dksc->sc_flags & DKF_KLABEL) == 0)
dksc->sc_flags &= ~DKF_VLABEL;
}

mutex_exit(&dk->dk_openlock);
return 0;
}

static int
dk_translate(struct dk_softc *dksc, struct buf *bp)
{
int part;
int wlabel;
daddr_t blkno;
struct disklabel *lp;
struct disk *dk;
uint64_t numsecs;
unsigned secsize;

lp = dksc->sc_dkdev.dk_label;
dk = &dksc->sc_dkdev;

part = DISKPART(bp->b_dev);
numsecs = dk->dk_geom.dg_secperunit;
secsize = dk->dk_geom.dg_secsize;

/*
* The transfer must be a whole number of blocks and the offset must
* not be negative.
*/
if ((bp->b_bcount % secsize) != 0 || bp->b_blkno < 0) {
bp->b_error = EINVAL;
goto done;
}

/* If there is nothing to do, then we are done */
if (bp->b_bcount == 0)
goto done;

wlabel = dksc->sc_flags & (DKF_WLABEL|DKF_LABELLING);
if (part == RAW_PART) {
uint64_t numblocks = btodb(numsecs * secsize);
if (bounds_check_with_mediasize(bp, DEV_BSIZE, numblocks) <= 0)
goto done;
} else {
if (bounds_check_with_label(&dksc->sc_dkdev, bp, wlabel) <= 0)
goto done;
}

/*
* Convert the block number to absolute and put it in terms
* of the device's logical block size.
*/
if (secsize >= DEV_BSIZE)
blkno = bp->b_blkno / (secsize / DEV_BSIZE);
else
blkno = bp->b_blkno * (DEV_BSIZE / secsize);

if (part != RAW_PART)
blkno += lp->d_partitions[DISKPART(bp->b_dev)].p_offset;
bp->b_rawblkno = blkno;

return -1;

done:
bp->b_resid = bp->b_bcount;
return bp->b_error;
}

static int
dk_strategy1(struct dk_softc *dksc, struct buf *bp)
{
int error;

DPRINTF_FOLLOW(("%s(%s, %p, %p)\n", __func__,
dksc->sc_xname, dksc, bp));

if (!(dksc->sc_flags & DKF_INITED)) {
DPRINTF_FOLLOW(("%s: not inited\n", __func__));
bp->b_error = ENXIO;
bp->b_resid = bp->b_bcount;
biodone(bp);
return 1;
}

error = dk_translate(dksc, bp);
if (error >= 0) {
biodone(bp);
return 1;
}

return 0;
}

void
dk_strategy(struct dk_softc *dksc, struct buf *bp)
{
int error;

error = dk_strategy1(dksc, bp);
if (error)
return;

/*
* Queue buffer and start unit
*/
dk_start(dksc, bp);
}

int
dk_strategy_defer(struct dk_softc *dksc, struct buf *bp)
{
int error;

error = dk_strategy1(dksc, bp);
if (error)
return error;

/*
* Queue buffer only
*/
mutex_enter(&dksc->sc_iolock);
disk_wait(&dksc->sc_dkdev);
bufq_put(dksc->sc_bufq, bp);
mutex_exit(&dksc->sc_iolock);

return 0;
}

int
dk_strategy_pending(struct dk_softc *dksc)
{
struct buf *bp;

if (!(dksc->sc_flags & DKF_INITED)) {
DPRINTF_FOLLOW(("%s: not inited\n", __func__));
return 0;
}

mutex_enter(&dksc->sc_iolock);
bp = bufq_peek(dksc->sc_bufq);
mutex_exit(&dksc->sc_iolock);

return bp != NULL;
}

void
dk_start(struct dk_softc *dksc, struct buf *bp)
{
const struct dkdriver *dkd = dksc->sc_dkdev.dk_driver;
int error;

if (!(dksc->sc_flags & DKF_INITED)) {
DPRINTF_FOLLOW(("%s: not inited\n", __func__));
return;
}

mutex_enter(&dksc->sc_iolock);

if (bp != NULL) {
bp->b_ci = curcpu();
disk_wait(&dksc->sc_dkdev);
bufq_put(dksc->sc_bufq, bp);
}

/*
* If another thread is running the queue, increment
* busy counter to 2 so that the queue is retried,
* because the driver may now accept additional
* requests.
*/
if (dksc->sc_busy < 2)
dksc->sc_busy++;
if (dksc->sc_busy > 1)
goto done;

/*
* Peeking at the buffer queue and committing the operation
* only after success isn't atomic.
*
* So when a diskstart fails, the buffer is saved
* and tried again before the next buffer is fetched.
* dk_drain() handles flushing of a saved buffer.
*
* This keeps order of I/O operations, unlike bufq_put.
*/

while (dksc->sc_busy > 0) {

bp = dksc->sc_deferred;
dksc->sc_deferred = NULL;

if (bp == NULL)
bp = bufq_get(dksc->sc_bufq);

while (bp != NULL) {

disk_busy(&dksc->sc_dkdev);
mutex_exit(&dksc->sc_iolock);
error = dkd->d_diskstart(dksc->sc_dev, bp);
mutex_enter(&dksc->sc_iolock);
if (error == EAGAIN || error == ENOMEM) {
/*
* Not a disk error. Retry later.
*/
KASSERT(dksc->sc_deferred == NULL);
dksc->sc_deferred = bp;
disk_unbusy(&dksc->sc_dkdev, 0, (bp->b_flags & B_READ));
disk_wait(&dksc->sc_dkdev);
break;
}

if (error != 0) {
bp->b_error = error;
bp->b_resid = bp->b_bcount;
mutex_exit(&dksc->sc_iolock);
dk_done(dksc, bp);
mutex_enter(&dksc->sc_iolock);
}

bp = bufq_get(dksc->sc_bufq);
}

dksc->sc_busy--;
}
done:
mutex_exit(&dksc->sc_iolock);
}

void
dk_done(struct dk_softc *dksc, struct buf *bp)
{
struct disk *dk = &dksc->sc_dkdev;

if (bp->b_error != 0) {
struct cfdriver *cd = device_cfdriver(dksc->sc_dev);

diskerr(bp, cd->cd_name, "error", LOG_PRINTF, 0,
dk->dk_label);
printf("\n");
}

mutex_enter(&dksc->sc_iolock);
disk_unbusy(dk, bp->b_bcount - bp->b_resid, (bp->b_flags & B_READ));
mutex_exit(&dksc->sc_iolock);

if ((dksc->sc_flags & DKF_NO_RND) == 0)
rnd_add_uint32(&dksc->sc_rnd_source, bp->b_rawblkno);

biodone(bp);
}

void
dk_drain(struct dk_softc *dksc)
{
struct buf *bp;

mutex_enter(&dksc->sc_iolock);
bp = dksc->sc_deferred;
dksc->sc_deferred = NULL;
if (bp != NULL) {
bp->b_error = EIO;
bp->b_resid = bp->b_bcount;
biodone(bp);
}
bufq_drain(dksc->sc_bufq);
mutex_exit(&dksc->sc_iolock);
}

int
dk_discard(struct dk_softc *dksc, dev_t dev, off_t pos, off_t len)
{
const struct dkdriver *dkd = dksc->sc_dkdev.dk_driver;
unsigned secsize = dksc->sc_dkdev.dk_geom.dg_secsize;
struct buf tmp, *bp = &tmp;
int maxsz;
int error = 0;

KASSERT(len >= 0);

DPRINTF_FOLLOW(("%s(%s, %p, 0x%"PRIx64", %jd, %jd)\n", __func__,
dksc->sc_xname, dksc, dev, (intmax_t)pos, (intmax_t)len));

if (!(dksc->sc_flags & DKF_INITED)) {
DPRINTF_FOLLOW(("%s: not inited\n", __func__));
return ENXIO;
}

if (secsize == 0 || (pos % secsize) != 0 || (len % secsize) != 0)
return EINVAL;

/* largest value that b_bcount can store */
maxsz = rounddown(INT_MAX, secsize);

while (len > 0) {
/* enough data to please the bounds checking code */
bp->b_error = 0;
bp->b_dev = dev;
bp->b_blkno = (daddr_t)(pos / secsize);
bp->b_bcount = lmin(len, maxsz);
bp->b_flags = B_WRITE;

error = dk_translate(dksc, bp);
if (error >= 0)
break;

error = dkd->d_discard(dksc->sc_dev,
(off_t)bp->b_rawblkno * secsize,
(off_t)bp->b_bcount);
if (error)
break;

pos += bp->b_bcount;
len -= bp->b_bcount;
}

return error;
}

int
dk_size(struct dk_softc *dksc, dev_t dev)
{
const struct dkdriver *dkd = dksc->sc_dkdev.dk_driver;
struct disklabel *lp;
int is_open;
int part;
int size;

if ((dksc->sc_flags & DKF_INITED) == 0)
return -1;

part = DISKPART(dev);
is_open = dksc->sc_dkdev.dk_openmask & (1 << part);

if (!is_open && dkd->d_open(dev, 0, S_IFBLK, curlwp))
return -1;

lp = dksc->sc_dkdev.dk_label;
if (lp->d_partitions[part].p_fstype != FS_SWAP)
size = -1;
else
size = lp->d_partitions[part].p_size *
(lp->d_secsize / DEV_BSIZE);

if (!is_open && dkd->d_close(dev, 0, S_IFBLK, curlwp))
return -1;

return size;
}

int
dk_ioctl(struct dk_softc *dksc, dev_t dev,
u_long cmd, void *data, int flag, struct lwp *l)
{
const struct dkdriver *dkd = dksc->sc_dkdev.dk_driver;
struct disklabel *lp;
struct disk *dk = &dksc->sc_dkdev;
#ifdef __HAVE_OLD_DISKLABEL
struct disklabel newlabel;
#endif
int error;

DPRINTF_FOLLOW(("%s(%s, %p, 0x%"PRIx64", 0x%lx)\n", __func__,
dksc->sc_xname, dksc, dev, cmd));

/* ensure that the pseudo disk is open for writes for these commands */
switch (cmd) {
case DIOCSDINFO:
case DIOCWDINFO:
#ifdef __HAVE_OLD_DISKLABEL
case ODIOCSDINFO:
case ODIOCWDINFO:
#endif
case DIOCKLABEL:
case DIOCWLABEL:
case DIOCAWEDGE:
case DIOCDWEDGE:
case DIOCSSTRATEGY:
if ((flag & FWRITE) == 0)
return EBADF;
}

/* ensure that the pseudo-disk is initialized for these */
switch (cmd) {
case DIOCGDINFO:
case DIOCSDINFO:
case DIOCWDINFO:
case DIOCGPARTINFO:
case DIOCKLABEL:
case DIOCWLABEL:
case DIOCGDEFLABEL:
case DIOCAWEDGE:
case DIOCDWEDGE:
case DIOCLWEDGES:
case DIOCMWEDGES:
case DIOCRMWEDGES:
case DIOCCACHESYNC:
#ifdef __HAVE_OLD_DISKLABEL
case ODIOCGDINFO:
case ODIOCSDINFO:
case ODIOCWDINFO:
case ODIOCGDEFLABEL:
#endif
if ((dksc->sc_flags & DKF_INITED) == 0)
return ENXIO;
}

error = disk_ioctl(dk, dev, cmd, data, flag, l);
if (error != EPASSTHROUGH)
return error;
else
error = 0;

switch (cmd) {
case DIOCWDINFO:
case DIOCSDINFO:
#ifdef __HAVE_OLD_DISKLABEL
case ODIOCWDINFO:
case ODIOCSDINFO:
#endif
#ifdef __HAVE_OLD_DISKLABEL
if (cmd == ODIOCSDINFO || cmd == ODIOCWDINFO) {
memset(&newlabel, 0, sizeof newlabel);
memcpy(&newlabel, data, sizeof (struct olddisklabel));
lp = &newlabel;
} else
#endif
lp = (struct disklabel *)data;

mutex_enter(&dk->dk_openlock);
dksc->sc_flags |= DKF_LABELLING;

error = setdisklabel(dksc->sc_dkdev.dk_label,
lp, 0, dksc->sc_dkdev.dk_cpulabel);
if (error == 0) {
if (cmd == DIOCWDINFO
#ifdef __HAVE_OLD_DISKLABEL
|| cmd == ODIOCWDINFO
#endif
)
error = writedisklabel(DKLABELDEV(dev),
dkd->d_strategy, dksc->sc_dkdev.dk_label,
dksc->sc_dkdev.dk_cpulabel);
}

dksc->sc_flags &= ~DKF_LABELLING;
mutex_exit(&dk->dk_openlock);
break;

case DIOCKLABEL:
if (*(int *)data != 0)
dksc->sc_flags |= DKF_KLABEL;
else
dksc->sc_flags &= ~DKF_KLABEL;
break;

case DIOCWLABEL:
if (*(int *)data != 0)
dksc->sc_flags |= DKF_WLABEL;
else
dksc->sc_flags &= ~DKF_WLABEL;
break;

case DIOCGDEFLABEL:
dk_getdefaultlabel(dksc, (struct disklabel *)data);
break;

#ifdef __HAVE_OLD_DISKLABEL
case ODIOCGDEFLABEL:
dk_getdefaultlabel(dksc, &newlabel);
if (newlabel.d_npartitions > OLDMAXPARTITIONS)
return ENOTTY;
memcpy(data, &newlabel, sizeof (struct olddisklabel));
break;
#endif

case DIOCGSTRATEGY:
{
struct disk_strategy *dks = (void *)data;

mutex_enter(&dksc->sc_iolock);
if (dksc->sc_bufq != NULL)
strlcpy(dks->dks_name,
bufq_getstrategyname(dksc->sc_bufq),
sizeof(dks->dks_name));
else
error = EINVAL;
mutex_exit(&dksc->sc_iolock);
dks->dks_paramlen = 0;
break;
}

case DIOCSSTRATEGY:
{
struct disk_strategy *dks = (void *)data;
struct bufq_state *new;
struct bufq_state *old;

if (dks->dks_param != NULL) {
return EINVAL;
}
dks->dks_name[sizeof(dks->dks_name) - 1] = 0; /* ensure term */
error = bufq_alloc(&new, dks->dks_name,
BUFQ_EXACT|BUFQ_SORT_RAWBLOCK);
if (error) {
return error;
}
mutex_enter(&dksc->sc_iolock);
old = dksc->sc_bufq;
if (old)
bufq_move(new, old);
dksc->sc_bufq = new;
mutex_exit(&dksc->sc_iolock);
if (old)
bufq_free(old);
break;
}

default:
error = ENOTTY;
}

return error;
}

/*
* dk_dump dumps all of physical memory into the partition specified.
* This requires substantially more framework than {s,w}ddump, and hence
* is probably much more fragile.
*
*/

#define DKFF_READYFORDUMP(x) (((x) & DKF_READYFORDUMP) == DKF_READYFORDUMP)
static volatile int dk_dumping = 0;

/* ARGSUSED */
int
dk_dump(struct dk_softc *dksc, dev_t dev,
daddr_t blkno, void *vav, size_t size, int flags)
{
const struct dkdriver *dkd = dksc->sc_dkdev.dk_driver;
struct disk_geom *dg = &dksc->sc_dkdev.dk_geom;
char *va = vav;
struct disklabel *lp;
struct partition *p;
int part, towrt, maxblkcnt, nblk;
int maxxfer, rv = 0;

/*
* ensure that we consider this device to be safe for dumping,
* and that the device is configured.
*/
if (!DKFF_READYFORDUMP(dksc->sc_flags)) {
DPRINTF(DKDB_DUMP, ("%s: bad dump flags 0x%x\n", __func__,
dksc->sc_flags));
return ENXIO;
}

/* ensure that we are not already dumping */
if (dk_dumping)
return EFAULT;
if ((flags & DK_DUMP_RECURSIVE) == 0)
dk_dumping = 1;

if (dkd->d_dumpblocks == NULL) {
DPRINTF(DKDB_DUMP, ("%s: no dumpblocks\n", __func__));
return ENXIO;
}

/* device specific max transfer size */
maxxfer = MAXPHYS;
if (dkd->d_iosize != NULL)
(*dkd->d_iosize)(dksc->sc_dev, &maxxfer);

/* Convert to disk sectors. Request must be a multiple of size. */
part = DISKPART(dev);
lp = dksc->sc_dkdev.dk_label;
if ((size % lp->d_secsize) != 0) {
DPRINTF(DKDB_DUMP, ("%s: odd size %zu\n", __func__, size));
return EFAULT;
}
towrt = size / lp->d_secsize;
blkno = dbtob(blkno) / lp->d_secsize; /* blkno in secsize units */

p = &lp->d_partitions[part];
if (part == RAW_PART) {
if (p->p_fstype != FS_UNUSED) {
DPRINTF(DKDB_DUMP, ("%s: bad fstype %d\n", __func__,
p->p_fstype));
return ENXIO;
}
/* Check whether dump goes to a wedge */
if (dksc->sc_dkdev.dk_nwedges == 0) {
DPRINTF(DKDB_DUMP, ("%s: dump to raw\n", __func__));
return ENXIO;
}
/* Check transfer bounds against media size */
if (blkno < 0 || (blkno + towrt) > dg->dg_secperunit) {
DPRINTF(DKDB_DUMP, ("%s: out of bounds blkno=%jd, towrt=%d, "
"nsects=%jd\n", __func__, (intmax_t)blkno, towrt, dg->dg_secperunit));
return EINVAL;
}
} else {
int nsects, sectoff;

if (p->p_fstype != FS_SWAP && p->p_fstype != FS_RAID) {
DPRINTF(DKDB_DUMP, ("%s: bad fstype %d\n", __func__,
p->p_fstype));
return ENXIO;
}
nsects = p->p_size;
sectoff = p->p_offset;

/* Check transfer bounds against partition size. */
if ((blkno < 0) || ((blkno + towrt) > nsects)) {
DPRINTF(DKDB_DUMP, ("%s: out of bounds blkno=%jd, towrt=%d, "
"nsects=%d\n", __func__, (intmax_t)blkno, towrt, nsects));
return EINVAL;
}

/* Offset block number to start of partition. */
blkno += sectoff;
}

/* Start dumping and return when done. */
maxblkcnt = howmany(maxxfer, lp->d_secsize);
while (towrt > 0) {
nblk = uimin(maxblkcnt, towrt);

if ((rv = (*dkd->d_dumpblocks)(dksc->sc_dev, va, blkno, nblk))
!= 0) {
DPRINTF(DKDB_DUMP, ("%s: dumpblocks %d\n", __func__,
rv));
return rv;
}

towrt -= nblk;
blkno += nblk;
va += nblk * lp->d_secsize;
}

if ((flags & DK_DUMP_RECURSIVE) == 0)
dk_dumping = 0;

return 0;
}

/* ARGSUSED */
void
dk_getdefaultlabel(struct dk_softc *dksc, struct disklabel *lp)
{
const struct dkdriver *dkd = dksc->sc_dkdev.dk_driver;
struct disk_geom *dg = &dksc->sc_dkdev.dk_geom;

memset(lp, 0, sizeof(*lp));

if (dg->dg_secperunit > UINT32_MAX)
lp->d_secperunit = UINT32_MAX;
else
lp->d_secperunit = dg->dg_secperunit;
lp->d_secsize = dg->dg_secsize;
lp->d_nsectors = dg->dg_nsectors;
lp->d_ntracks = dg->dg_ntracks;
lp->d_ncylinders = dg->dg_ncylinders;
lp->d_secpercyl = lp->d_ntracks * lp->d_nsectors;

strlcpy(lp->d_typename, dksc->sc_xname, sizeof(lp->d_typename));
lp->d_type = dksc->sc_dtype;
strlcpy(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 = lp->d_secperunit;
lp->d_partitions[RAW_PART].p_fstype = FS_UNUSED;
lp->d_npartitions = RAW_PART + 1;

lp->d_magic = DISKMAGIC;
lp->d_magic2 = DISKMAGIC;

if (dkd->d_label)
dkd->d_label(dksc->sc_dev, lp);

lp->d_checksum = dkcksum(lp);
}

/* ARGSUSED */
void
dk_getdisklabel(struct dk_softc *dksc, dev_t dev)
{
const struct dkdriver *dkd = dksc->sc_dkdev.dk_driver;
struct disklabel *lp = dksc->sc_dkdev.dk_label;
struct cpu_disklabel *clp = dksc->sc_dkdev.dk_cpulabel;
struct disk_geom *dg = &dksc->sc_dkdev.dk_geom;
struct partition *pp;
int i, lpratio, dgratio;
const char *errstring;

memset(clp, 0x0, sizeof(*clp));
dk_getdefaultlabel(dksc, lp);
errstring = readdisklabel(DKLABELDEV(dev), dkd->d_strategy,
dksc->sc_dkdev.dk_label, dksc->sc_dkdev.dk_cpulabel);
if (errstring) {
dk_makedisklabel(dksc);
if (dksc->sc_flags & DKF_WARNLABEL)
printf("%s: %s\n", dksc->sc_xname, errstring);
return;
}

if ((dksc->sc_flags & DKF_LABELSANITY) == 0)
return;

/* Convert sector counts to multiple of DEV_BSIZE for comparison */
lpratio = dgratio = 1;
if (lp->d_secsize > DEV_BSIZE)
lpratio = lp->d_secsize / DEV_BSIZE;
if (dg->dg_secsize > DEV_BSIZE)
dgratio = dg->dg_secsize / DEV_BSIZE;

/* Sanity check */
if ((uint64_t)lp->d_secperunit * lpratio > dg->dg_secperunit * dgratio)
printf("WARNING: %s: "
"total unit size in disklabel (%" PRIu64 ") "
"!= the size of %s (%" PRIu64 ")\n", dksc->sc_xname,
(uint64_t)lp->d_secperunit * lpratio, dksc->sc_xname,
dg->dg_secperunit * dgratio);
else if (lp->d_secperunit < UINT32_MAX &&
(uint64_t)lp->d_secperunit * lpratio < dg->dg_secperunit * dgratio)
printf("%s: %" PRIu64 " trailing sectors not covered"
" by disklabel\n", dksc->sc_xname,
(dg->dg_secperunit * dgratio)
- (lp->d_secperunit * lpratio));

for (i=0; i < lp->d_npartitions; i++) {
uint64_t pend;

pp = &lp->d_partitions[i];
pend = pp->p_offset + pp->p_size;
if (pend * lpratio > dg->dg_secperunit * dgratio)
printf("WARNING: %s: end of partition `%c' exceeds "
"the size of %s (%" PRIu64 ")\n", dksc->sc_xname,
'a' + i, dksc->sc_xname,
dg->dg_secperunit * dgratio);
}
}

/*
* Heuristic to conjure a disklabel if reading a disklabel failed.
*
* This is to allow the raw partition to be used for a filesystem
* without caring about the write protected label sector.
*
* If the driver provides it's own callback, use that instead.
*/
/* ARGSUSED */
static void
dk_makedisklabel(struct dk_softc *dksc)
{
const struct dkdriver *dkd = dksc->sc_dkdev.dk_driver;
struct disklabel *lp = dksc->sc_dkdev.dk_label;

strlcpy(lp->d_packname, "default label", sizeof(lp->d_packname));

if (dkd->d_label)
dkd->d_label(dksc->sc_dev, lp);
else
lp->d_partitions[RAW_PART].p_fstype = FS_BSDFFS;

lp->d_checksum = dkcksum(lp);
}

MODULE(MODULE_CLASS_MISC, dk_subr, NULL);

static int
dk_subr_modcmd(modcmd_t cmd, void *arg)
{
switch (cmd) {
case MODULE_CMD_INIT:
case MODULE_CMD_FINI:
return 0;
case MODULE_CMD_STAT:
case MODULE_CMD_AUTOUNLOAD:
default:
return ENOTTY;
}
}