From c603157edceb1cdcc28d408fb29b23453d35ea17 Mon Sep 17 00:00:00 2001
From: David du Colombier <0intro@gmail.com>
Date: Thu, 14 Nov 2002 00:00:00 +0000
Subject: [PATCH] Plan 9 from Bell Labs 2002-11-14

---
 port/devwpsd.c | 1490 ------------------------------------------------
 1 file changed, 1490 deletions(-)
 delete mode 100644 port/devwpsd.c

diff --git a/port/devwpsd.c b/port/devwpsd.c
deleted file mode 100644
index df4b6e1ab7237d71052e5207d54cb80744977fee..0000000000000000000000000000000000000000
--- a/port/devwpsd.c
+++ /dev/null
@@ -1,1490 +0,0 @@
-/*
- * Storage Device.
- */
-#include "u.h"
-#include "../port/lib.h"
-#include "mem.h"
-#include "dat.h"
-#include "fns.h"
-#include "io.h"
-#include "ureg.h"
-#include "../port/error.h"
-
-#include "../port/sd.h"
-
-extern Dev wpsddevtab;
-extern SDifc* sdifc[];
-
-typedef struct {
-	SDev*	dt_dev;
-	int	dt_nunits;		/* num units in dev */
-} dev_t;
-
-static dev_t* devs;			/* all devices */
-static QLock devslock;			/* insertion and removal of devices */
-static int ndevs;			/* total number of devices in the system */
-
-enum {
-	Rawcmd,
-	Rawdata,
-	Rawstatus,
-};
-
-enum
-{
-	CMpart,
-	CMdelpart,
-	CMwpenable,
-	CMwpblocks,
-	CMwildcard,
-};
-
-Cmdtab ctlmsg[] =
-{
-	CMpart,		"part",		3,
-	CMdelpart,	"delpart",	1,
-	CMwpenable,	"wpenable",	0,
-	CMwpblocks,	"wpblocks",	2,
-	CMwildcard,	"*",		0,
-};
-
-enum {
-	Qtopdir		= 1,		/* top level directory */
-	Qtopbase,
-	Qtopctl = Qtopbase,
-	Qtopstat,
-
-	Qunitdir,			/* directory per unit */
-	Qunitbase,
-	Qctl		= Qunitbase,
-	Qraw,
-	Qpart,
-
-	TypeLOG		= 4,
-	NType		= (1<<TypeLOG),
-	TypeMASK	= (NType-1),
-	TypeSHIFT	= 0,
-
-	PartLOG		= 8,
-	NPart		= (1<<PartLOG),
-	PartMASK	= (NPart-1),
-	PartSHIFT	= TypeLOG,
-
-	UnitLOG		= 8,
-	NUnit		= (1<<UnitLOG),
-	UnitMASK	= (NUnit-1),
-	UnitSHIFT	= (PartLOG+TypeLOG),
-
-	DevLOG		= 8,
-	NDev		= (1 << DevLOG),
-	DevMASK	= (NDev-1),
-	DevSHIFT = (UnitLOG+PartLOG+TypeLOG),
-
-	Ncmd = 20,
-};
-
-#define TYPE(q)		((((ulong)(q).path)>>TypeSHIFT) & TypeMASK)
-#define PART(q)		((((ulong)(q).path)>>PartSHIFT) & PartMASK)
-#define UNIT(q)		((((ulong)(q).path)>>UnitSHIFT) & UnitMASK)
-#define DEV(q)		((((ulong)(q).path)>>DevSHIFT) & DevMASK)
-#define QID(d,u, p, t)	(((d)<<DevSHIFT)|((u)<<UnitSHIFT)|\
-					 ((p)<<PartSHIFT)|((t)<<TypeSHIFT))
-
-
-static void
-sdaddpart(SDunit* unit, char* name, ulong start, ulong end)
-{
-	SDpart *pp;
-	int i, partno;
-
-	/*
-	 * Check name not already used
-	 * and look for a free slot.
-	 */
-	if(unit->part != nil){
-		partno = -1;
-		for(i = 0; i < unit->npart; i++){
-			pp = &unit->part[i];
-			if(!pp->valid){
-				if(partno == -1)
-					partno = i;
-				break;
-			}
-			if(strcmp(name, pp->name) == 0){
-				if(pp->start == start && pp->end == end)
-					return;
-				error(Ebadctl);
-			}
-		}
-	}
-	else{
-		if((unit->part = malloc(sizeof(SDpart)*SDnpart)) == nil)
-			error(Enomem);
-		unit->npart = SDnpart;
-		partno = 0;
-	}
-
-	/*
-	 * If no free slot found then increase the
-	 * array size (can't get here with unit->part == nil).
-	 */
-	if(partno == -1){
-		if(unit->npart >= NPart)
-			error(Enomem);
-		if((pp = malloc(sizeof(SDpart)*(unit->npart+SDnpart))) == nil)
-			error(Enomem);
-		memmove(pp, unit->part, sizeof(SDpart)*unit->npart);
-		free(unit->part);
-		unit->part = pp;
-		partno = unit->npart;
-		unit->npart += SDnpart;
-	}
-
-	/*
-	 * Check size and extent are valid.
-	 */
-	if(start > end || end > unit->sectors)
-		error(Eio);
-	pp = &unit->part[partno];
-	pp->start = start;
-	pp->end = end;
-	kstrdup(&pp->name, name);
-	kstrdup(&pp->user, eve);
-	pp->perm = 0640;
-	pp->valid = 1;
-}
-
-static void
-sddelpart(SDunit* unit,  char* name)
-{
-	int i;
-	SDpart *pp;
-
-	/*
-	 * Look for the partition to delete.
-	 * Can't delete if someone still has it open.
-	 */
-	pp = unit->part;
-	for(i = 0; i < unit->npart; i++){
-		if(strcmp(name, pp->name) == 0)
-			break;
-		pp++;
-	}
-	if(i >= unit->npart)
-		error(Ebadctl);
-	if(strcmp(up->user, pp->user) && !iseve())
-		error(Eperm);
-	pp->valid = 0;
-	pp->vers++;
-}
-
-static int
-sdinitpart(SDunit* unit)
-{
-	int i, nf;
-	ulong start, end;
-	char *f[4], *p, *q, buf[10];
-
-	unit->vers++;
-	unit->sectors = unit->secsize = 0;
-	if(unit->part){
-		for(i = 0; i < unit->npart; i++){
-			unit->part[i].valid = 0;
-			unit->part[i].vers++;
-		}
-	}
-
-	if(unit->inquiry[0] & 0xC0)
-		return 0;
-	switch(unit->inquiry[0] & 0x1F){
-	case 0x00:			/* DA */
-	case 0x04:			/* WORM */
-	case 0x05:			/* CD-ROM */
-	case 0x07:			/* MO */
-		break;
-	default:
-		return 0;
-	}
-
-	if(unit->dev->ifc->online)
-		unit->dev->ifc->online(unit);
-	if(unit->sectors){
-		sdaddpart(unit, "data", 0, unit->sectors);
-	
-		/*
-		 * Use partitions passed from boot program,
-		 * e.g.
-		 *	sdC0part=dos 63 123123/plan9 123123 456456
-		 * This happens before /boot sets hostname so the
-		 * partitions will have the null-string for user.
-		 * The gen functions patch it up.
-		 */
-		snprint(buf, sizeof buf, "%spart", unit->name);
-		for(p = getconf(buf); p != nil; p = q){
-			if(q = strchr(p, '/'))
-				*q++ = '\0';
-			nf = tokenize(p, f, nelem(f));
-			if(nf < 3)
-				continue;
-		
-			start = strtoul(f[1], 0, 0);
-			end = strtoul(f[2], 0, 0);
-			if(!waserror()){
-				sdaddpart(unit, f[0], start, end);
-				poperror();
-			}
-		}			
-	}
-
-	return 1;
-}
-
-static SDev*
-sdgetdev(int idno)
-{
-	SDev *sdev;
-	int i;
-
-	qlock(&devslock);
-	for(i = 0; i != ndevs; i++)
-		if (devs[i].dt_dev->idno == idno)
-			break;
-	
-	if(i == ndevs)
-		sdev = nil;
-	else{
-		sdev = devs[i].dt_dev;
-		incref(&sdev->r);
-	}
-	qunlock(&devslock);
-	return sdev;
-}
-
-static SDunit*
-sdgetunit(SDev* sdev, int subno)
-{
-	SDunit *unit;
-	char buf[32];
-
-	/*
-	 * Associate a unit with a given device and sub-unit
-	 * number on that device.
-	 * The device will be probed if it has not already been
-	 * successfully accessed.
-	 */
-	qlock(&sdev->unitlock);
-	if(subno > sdev->nunit){
-		qunlock(&sdev->unitlock);
-		return nil;
-	}
-
-	unit = sdev->unit[subno];
-	if(unit == nil){
-		/*
-		 * Probe the unit only once. This decision
-		 * may be a little severe and reviewed later.
-		 */
-		if(sdev->unitflg[subno]){
-			qunlock(&sdev->unitlock);
-			return nil;
-		}
-		if((unit = malloc(sizeof(SDunit))) == nil){
-			qunlock(&sdev->unitlock);
-			return nil;
-		}
-		sdev->unitflg[subno] = 1;
-
-		if(sdev->enabled == 0 && sdev->ifc->enable)
-			sdev->ifc->enable(sdev);
-		sdev->enabled = 1;
-
-		snprint(buf, sizeof(buf), "%s%d", sdev->name, subno);
-		kstrdup(&unit->name, buf);
-		kstrdup(&unit->user, eve);
-		unit->perm = 0555;
-		unit->subno = subno;
-		unit->dev = sdev;
-
-		/*
-		 * No need to lock anything here as this is only
-		 * called before the unit is made available in the
-		 * sdunit[] array.
-		 */
-		if(unit->dev->ifc->verify(unit) == 0){
-			qunlock(&sdev->unitlock);
-			free(unit);
-			return nil;
-		}
-		sdev->unit[subno] = unit;
-	}
-	qunlock(&sdev->unitlock);
-	return unit;
-}
-
-static void
-sdreset(void)
-{
-	int i;
-	SDev *sdev, *tail, *sdlist;
-
-	/*
-	 * Probe all configured controllers and make a list
-	 * of devices found, accumulating a possible maximum number
-	 * of units attached and marking each device with an index
-	 * into the linear top-level directory array of units.
-	 */
-	tail = sdlist = nil;
-	for(i = 0; sdifc[i] != nil; i++){
-		if(sdifc[i]->pnp == nil || (sdev = sdifc[i]->pnp()) == nil)
-			continue;
-		if(sdlist != nil)
-			tail->next = sdev;
-		else
-			sdlist = sdev;
-		for(tail = sdev; tail->next != nil; tail = tail->next){
-			tail->unit = (SDunit**)malloc(tail->nunit * sizeof(SDunit*));
-			tail->unitflg = (int*)malloc(tail->nunit * sizeof(int));
-			assert(tail->unit && tail->unitflg);
-			ndevs++;
-		}
-		tail->unit = (SDunit**)malloc(tail->nunit * sizeof(SDunit*));
-		tail->unitflg = (int*)malloc(tail->nunit * sizeof(int));
-		ndevs++;
-	}
-	
-	/*
-	 * Legacy and option code goes here. This will be hard...
-	 */
-
-	/*
-	 * The maximum number of possible units is known, allocate
-	 * placeholders for their datastructures; the units will be
-	 * probed and structures allocated when attached.
-	 * Allocate controller names for the different types.
-	 */
-	if(ndevs == 0)
-		return;
-	for(i = 0; sdifc[i] != nil; i++){
-		/*
-		 * BUG: no check is made here or later when a
-		 * unit is attached that the id and name are set.
-		 */
-		if(sdifc[i]->id)
-			sdifc[i]->id(sdlist);
-	}
-
-	/* 
-	  * The IDs have been set, unlink the sdlist and copy the spec to
-	  * the devtab.
-	  */
-	devs = (dev_t*)malloc(ndevs * sizeof(dev_t));
-	memset(devs, 0, ndevs * sizeof(dev_t));
-	i = 0;
-	while(sdlist != nil){
-		devs[i].dt_dev = sdlist;
-		devs[i].dt_nunits = sdlist->nunit;
-		sdlist = sdlist->next;
-		devs[i].dt_dev->next = nil;
-		i++;
-	}
-}
-
-static int
-sd2gen(Chan* c, int i, Dir* dp)
-{
-	Qid q;
-	vlong l;
-	SDpart *pp;
-	SDperm *perm;
-	SDunit *unit;
-	SDev *sdev;
-	int rv;
-
-	sdev = sdgetdev(DEV(c->qid));
-	assert(sdev);
-	unit = sdev->unit[UNIT(c->qid)];
-
-	rv = -1;
-	switch(i){
-	case Qctl:
-		mkqid(&q, QID(DEV(c->qid), UNIT(c->qid), PART(c->qid), Qctl), 
-			   unit->vers, QTFILE);
-		perm = &unit->ctlperm;
-		if(emptystr(perm->user)){
-			kstrdup(&perm->user, eve);
-			perm->perm = 0640;
-		}
-		devdir(c, q, "ctl", 0, perm->user, perm->perm, dp);
-		rv = 1;
-		break;
-
-	case Qraw:
-		mkqid(&q, QID(DEV(c->qid), UNIT(c->qid), PART(c->qid), Qraw), 
-			   unit->vers, QTFILE);
-		perm = &unit->rawperm;
-		if(emptystr(perm->user)){
-			kstrdup(&perm->user, eve);
-			perm->perm = DMEXCL|0600;
-		}
-		devdir(c, q, "raw", 0, perm->user, perm->perm, dp);
-		rv = 1;
-		break;
-
-	case Qpart:
-		pp = &unit->part[PART(c->qid)];
-		l = (pp->end - pp->start) * (vlong)unit->secsize;
-		mkqid(&q, QID(DEV(c->qid), UNIT(c->qid), PART(c->qid), Qpart), 
-			   unit->vers+pp->vers, QTFILE);
-		if(emptystr(pp->user))
-			kstrdup(&pp->user, eve);
-		devdir(c, q, pp->name, l, pp->user, pp->perm, dp);
-		rv = 1;
-		break;
-	}
-	
-	decref(&sdev->r);
-	return rv;
-}
-
-static int
-sd1gen(Chan* c, int i, Dir* dp)
-{
-	Qid q;
-
-	switch(i){
-	case Qtopctl:
-		mkqid(&q, QID(0, 0, 0, Qtopctl), 0, QTFILE);
-		devdir(c, q, "sdctl", 0, eve, 0640, dp);
-		return 1;
-	case Qtopstat:
-		mkqid(&q, QID(0, 0, 0, Qtopstat), 0, QTFILE);
-		devdir(c, q, "sdstat", 0, eve, 0640, dp);
-		return 1;
-	}
-	return -1;
-}
-
-static int
-sdgen(Chan* c, char*, Dirtab*, int, int s, Dir* dp)
-{
-	Qid q;
-	vlong l;
-	int i, r;
-	SDpart *pp;
-	SDunit *unit;
-	SDev *sdev;
-
-	switch(TYPE(c->qid)){
-	case Qtopdir:
-		if(s == DEVDOTDOT){
-			mkqid(&q, QID(0, s, 0, Qtopdir), 0, QTDIR);
-			sprint(up->genbuf, "#%C", wpsddevtab.dc);
-			devdir(c, q, up->genbuf, 0, eve, 0555, dp);
-			return 1;
-		}
-
-		if(s == 0 || s == 1)
-			return sd1gen(c, s + Qtopbase, dp);
-		s -= 2;
-
-		qlock(&devslock);
-		for(i = 0; i != ndevs; i++){
-			if (s < devs[i].dt_nunits)
-				break;
-			s -= devs[i].dt_nunits;
-		}
-		
-		if(i == ndevs){
-			/* Run of the end of the list */
-			qunlock(&devslock);
-			return -1;
-		}
-
-		if ((sdev = devs[i].dt_dev) == nil){
-			qunlock(&devslock);
-			return 0;
-		}
-
-		incref(&sdev->r);
-		qunlock(&devslock);
-
-		if((unit = sdev->unit[s]) == nil)
-			if((unit = sdgetunit(sdev, s)) == nil){
-				decref(&sdev->r);
-				return 0;
-			}
-
-		mkqid(&q, QID(sdev->idno, s, 0, Qunitdir), 0, QTDIR);
-		if(emptystr(unit->user))
-			kstrdup(&unit->user, eve);
-		devdir(c, q, unit->name, 0, unit->user, unit->perm, dp);
-		decref(&sdev->r);
-		return 1;
-
-	case Qunitdir:
-		if(s == DEVDOTDOT){
-			mkqid(&q, QID(0, s, 0, Qtopdir), 0, QTDIR);
-			sprint(up->genbuf, "#%C", wpsddevtab.dc);
-			devdir(c, q, up->genbuf, 0, eve, 0555, dp);
-			return 1;
-		}
-		
-		if((sdev = sdgetdev(DEV(c->qid))) == nil){
-			devdir(c, q, "unavailable", 0, eve, 0, dp);
-			return 1;
-		}
-
-		unit = sdev->unit[UNIT(c->qid)];
-		qlock(&unit->ctl);
-
-		/*
-		 * Check for media change.
-		 * If one has already been detected, sectors will be zero.
-		 * If there is one waiting to be detected, online
-		 * will return > 1.
-		 * Online is a bit of a large hammer but does the job.
-		 */
-		if(unit->sectors == 0
-		|| (unit->dev->ifc->online && unit->dev->ifc->online(unit) > 1))
-			sdinitpart(unit);
-
-		i = s+Qunitbase;
-		if(i < Qpart){
-			r = sd2gen(c, i, dp);
-			qunlock(&unit->ctl);
-			decref(&sdev->r);
-			return r;
-		}
-		i -= Qpart;
-		if(unit->part == nil || i >= unit->npart){
-			qunlock(&unit->ctl);
-			decref(&sdev->r);
-			break;
-		}
-		pp = &unit->part[i];
-		if(!pp->valid){
-			qunlock(&unit->ctl);
-			decref(&sdev->r);
-			return 0;
-		}
-		l = (pp->end - pp->start) * (vlong)unit->secsize;
-		mkqid(&q, QID(DEV(c->qid), UNIT(c->qid), i, Qpart), 
-			    unit->vers+pp->vers, QTFILE);
-		if(emptystr(pp->user))
-			kstrdup(&pp->user, eve);
-		devdir(c, q, pp->name, l, pp->user, pp->perm, dp);
-		qunlock(&unit->ctl);
-		decref(&sdev->r);
-		return 1;
-	case Qraw:
-	case Qctl:
-	case Qpart:
-		if((sdev = sdgetdev(DEV(c->qid))) == nil){
-			devdir(c, q, "unavailable", 0, eve, 0, dp);
-			return 1;
-		}
-		unit = sdev->unit[UNIT(c->qid)];
-		qlock(&unit->ctl);
-		r = sd2gen(c, TYPE(c->qid), dp);
-		qunlock(&unit->ctl);
-		decref(&sdev->r);
-		return r;
-	case Qtopctl:
-	case Qtopstat:
-		return sd1gen(c, TYPE(c->qid), dp);
-	default:
-		break;
-	}
-
-	return -1;
-}
-
-static Chan*
-sdattach(char* spec)
-{
-	Chan *c;
-	char *p;
-	SDev *sdev;
-	int idno, subno, i;
-
-	if(ndevs == 0 || *spec == '\0'){
-		c = devattach(wpsddevtab.dc, spec);
-		mkqid(&c->qid, QID(0, 0, 0, Qtopdir), 0, QTDIR);
-		return c;
-	}
-
-	if(spec[0] != 's' || spec[1] != 'd')
-		error(Ebadspec);
-	idno = spec[2];
-	subno = strtol(&spec[3], &p, 0);
-	if(p == &spec[3])
-		error(Ebadspec);
-
-	qlock(&devslock);
-	for (sdev = nil, i = 0; i != ndevs; i++)
-		if ((sdev = devs[i].dt_dev) != nil && sdev->idno == idno)
-			break;
-
-	if(i == ndevs || subno >= sdev->nunit || sdgetunit(sdev, subno) == nil){
-		qunlock(&devslock);
-		error(Enonexist);
-	}
-	incref(&sdev->r);
-	qunlock(&devslock);
-
-	c = devattach(wpsddevtab.dc, spec);
-	mkqid(&c->qid, QID(sdev->idno, subno, 0, Qunitdir), 0, QTDIR);
-	c->dev = (sdev->idno << UnitLOG) + subno;
-	decref(&sdev->r);
-	return c;
-}
-
-static Walkqid*
-sdwalk(Chan* c, Chan* nc, char** name, int nname)
-{
-	return devwalk(c, nc, name, nname, nil, 0, sdgen);
-}
-
-static int
-sdstat(Chan* c, uchar* db, int n)
-{
-	return devstat(c, db, n, nil, 0, sdgen);
-}
-
-static Chan*
-sdopen(Chan* c, int omode)
-{
-	SDpart *pp;
-	SDunit *unit;
-	SDev *sdev;
-	uchar tp;
-
-	c = devopen(c, omode, 0, 0, sdgen);
-	if((tp = TYPE(c->qid)) != Qctl && tp != Qraw && tp != Qpart)
-		return c;
-
-	sdev = sdgetdev(DEV(c->qid));
-	if(sdev == nil)
-		error(Enonexist);
-	unit = sdev->unit[UNIT(c->qid)];
-
-	switch(TYPE(c->qid)){
-	case Qctl:
-		c->qid.vers = unit->vers;
-		break;
-	case Qraw:
-		c->qid.vers = unit->vers;
-		if(tas(&unit->rawinuse) != 0){
-			c->flag &= ~COPEN;
-			error(Einuse);
-		}
-		unit->state = Rawcmd;
-		break;
-	case Qpart:
-		qlock(&unit->ctl);
-		if(waserror()){
-			qunlock(&unit->ctl);
-			c->flag &= ~COPEN;
-			nexterror();
-		}
-		pp = &unit->part[PART(c->qid)];
-		c->qid.vers = unit->vers+pp->vers;
-		qunlock(&unit->ctl);
-		poperror();
-		break;
-	}
-	decref(&sdev->r);
-	return c;
-}
-
-static void
-sdclose(Chan* c)
-{
-	SDunit *unit;
-	SDev *sdev;
-
-	if(c->qid.type & QTDIR)
-		return;
-	if(!(c->flag & COPEN))
-		return;
-
-	switch(TYPE(c->qid)){
-	default:
-		break;
-	case Qraw:
-		sdev = sdgetdev(DEV(c->qid));
-		if (sdev) {
-			unit = sdev->unit[UNIT(c->qid)];
-			unit->rawinuse = 0;
-			decref(&sdev->r);
-		}
-		break;
-	}
-}
-
-static long
-sdio(Chan* c, int write, char* a, long len, vlong off)
-{
-	int nchange;
-	long l;
-	uchar *b;
-	SDpart *pp;
-	SDunit *unit;
-	SDev *sdev;
-	ulong bno, max, nb, offset;
-
-	sdev = sdgetdev(DEV(c->qid));
-	if(sdev == nil)
-		error(Enonexist);
-	unit = sdev->unit[UNIT(c->qid)];
-	if(unit == nil)
-		error(Enonexist);
-
-	nchange = 0;
-	qlock(&unit->ctl);
-	while(waserror()){
-		/* notification of media change; go around again */
-		if(strcmp(up->errstr, Eio) == 0 && unit->sectors == 0 && nchange++ == 0){
-			sdinitpart(unit);
-			continue;
-		}
-
-		/* other errors; give up */
-		qunlock(&unit->ctl);
-		decref(&sdev->r);
-		nexterror();
-	}
-	pp = &unit->part[PART(c->qid)];
-	if(unit->vers+pp->vers != c->qid.vers)
-		error(Eio);
-
-	/*
-	 * Check the request is within bounds.
-	 * Removeable drives are locked throughout the I/O
-	 * in case the media changes unexpectedly.
-	 * Non-removeable drives are not locked during the I/O
-	 * to allow the hardware to optimise if it can; this is
-	 * a little fast and loose.
-	 * It's assumed that non-removeable media parameters
-	 * (sectors, secsize) can't change once the drive has
-	 * been brought online.
-	 */
-	bno = (off/unit->secsize) + pp->start;
-	nb = ((off+len+unit->secsize-1)/unit->secsize) + pp->start - bno;
-	max = SDmaxio/unit->secsize;
-	if(nb > max)
-		nb = max;
-	if(bno+nb > pp->end)
-		nb = pp->end - bno;
-	if(bno >= pp->end || nb == 0){
-		if(write)
-			error(Eio);
-		qunlock(&unit->ctl);
-		decref(&sdev->r);
-		poperror();
-		return 0;
-	}
-	if(!(unit->inquiry[1] & 0x80)){
-		qunlock(&unit->ctl);
-		poperror();
-	}
-
-	b = malloc(nb*unit->secsize);
-	if(b == nil)
-		error(Enomem);
-	if(waserror()){
-		free(b);
-		if(!(unit->inquiry[1] & 0x80))
-			decref(&sdev->r);		/* gadverdamme! */
-		nexterror();
-	}
-
-	offset = off%unit->secsize;
-	if(offset+len > nb*unit->secsize)
-		len = nb*unit->secsize - offset;
-	if(write){
-		if(offset || (len%unit->secsize)){
-			l = unit->dev->ifc->bio(unit, 0, 0, b, nb, bno);
-			if(l < 0)
-				error(Eio);
-			if(l < (nb*unit->secsize)){
-				nb = l/unit->secsize;
-				l = nb*unit->secsize - offset;
-				if(len > l)
-					len = l;
-			}
-		}
-		memmove(b+offset, a, len);
-		l = unit->dev->ifc->bio(unit, 0, 1, b, nb, bno);
-		if(l < 0)
-			error(Eio);
-		if(l < offset)
-			len = 0;
-		else if(len > l - offset)
-			len = l - offset;
-	}
-	else{
-		l = unit->dev->ifc->bio(unit, 0, 0, b, nb, bno);
-		if(l < 0)
-			error(Eio);
-		if(l < offset)
-			len = 0;
-		else if(len > l - offset)
-			len = l - offset;
-		memmove(a, b+offset, len);
-	}
-	free(b);
-	poperror();
-
-	if(unit->inquiry[1] & 0x80){
-		qunlock(&unit->ctl);
-		poperror();
-	}
-
-	decref(&sdev->r);
-	return len;
-}
-
-static long
-sdrio(SDreq* r, void* a, long n)
-{
-	void *data;
-
-	if(n >= SDmaxio || n < 0)
-		error(Etoobig);
-
-	data = nil;
-	if(n){
-		if((data = malloc(n)) == nil)
-			error(Enomem);
-		if(r->write)
-			memmove(data, a, n);
-	}
-	r->data = data;
-	r->dlen = n;
-
-	if(waserror()){
-		if(data != nil){
-			free(data);
-			r->data = nil;
-		}
-		nexterror();
-	}
-
-	if(r->unit->dev->ifc->rio(r) != SDok)
-		error(Eio);
-
-	if(!r->write && r->rlen > 0)
-		memmove(a, data, r->rlen);
-	if(data != nil){
-		free(data);
-		r->data = nil;
-	}
-	poperror();
-
-	return r->rlen;
-}
-
-static long
-sdread(Chan *c, void *a, long n, vlong off)
-{
-	char *p, *e, *buf;
-	SDpart *pp;
-	SDunit *unit;
-	SDev *sdev;
-	ulong offset;
-	int i, l, status;
-
-	offset = off;
-	switch(TYPE(c->qid)){
-	default:
-		error(Eperm);
-	case Qtopstat:
-		p = buf = malloc(READSTR);
-		assert(p);
-		e = p + READSTR;
-		qlock(&devslock);
-		for(i = 0; i != ndevs; i++){
-			SDev *sdev = devs[i].dt_dev;
-
-			if(sdev->ifc->stat)
-				p = sdev->ifc->stat(sdev, p, e);
-			else
-				p = seprint(e, "%s; no statistics available\n", sdev->name);
-		}
-		qunlock(&devslock);
-		n = readstr(off, a, n, buf);
-		free(buf);
-		return n;
-
-	case Qtopdir:
-	case Qunitdir:
-		return devdirread(c, a, n, 0, 0, sdgen);
-
-	case Qctl:
-		sdev = sdgetdev(DEV(c->qid));
-		if (sdev == nil)
-			error(Enonexist);
-
-		unit = sdev->unit[UNIT(c->qid)];
-		p = malloc(READSTR);
-		l = snprint(p, READSTR, "inquiry %.48s\n",
-			(char*)unit->inquiry+8);
-		qlock(&unit->ctl);
-		/*
-		 * If there's a device specific routine it must
-		 * provide all information pertaining to night geometry
-		 * and the garscadden trains.
-		 */
-		if(unit->dev->ifc->rctl)
-			l += unit->dev->ifc->rctl(unit, p+l, READSTR-l);
-		if(unit->sectors == 0)
-			sdinitpart(unit);
-		if(unit->sectors){
-			if(unit->dev->ifc->rctl == nil)
-				l += snprint(p+l, READSTR-l,
-					"geometry %ld %ld\n",
-					unit->sectors, unit->secsize);
-			pp = unit->part;
-			for(i = 0; i < unit->npart; i++){
-				if(pp->valid)
-					l += snprint(p+l, READSTR-l,
-						"part %s %lud %lud\n",
-						pp->name, pp->start, pp->end);
-				pp++;
-			}
-		}
-		qunlock(&unit->ctl);
-		decref(&sdev->r);
-		l = readstr(offset, a, n, p);
-		free(p);
-		return l;
-
-	case Qraw:
-		sdev = sdgetdev(DEV(c->qid));
-		if (sdev == nil)
-			error(Enonexist);
-
-		unit = sdev->unit[UNIT(c->qid)];
-		qlock(&unit->raw);
-		if(waserror()){
-			qunlock(&unit->raw);
-			decref(&sdev->r);
-			nexterror();
-		}
-		if(unit->state == Rawdata){
-			unit->state = Rawstatus;
-			i = sdrio(unit->req, a, n);
-		}
-		else if(unit->state == Rawstatus){
-			status = unit->req->status;
-			unit->state = Rawcmd;
-			free(unit->req);
-			unit->req = nil;
-			i = readnum(0, a, n, status, NUMSIZE);
-		} else
-			i = 0;
-		qunlock(&unit->raw);
-		decref(&sdev->r);
-		poperror();
-		return i;
-
-	case Qpart:
-		return sdio(c, 0, a, n, off);
-	}
-
-	return 0;
-}
-
-typedef struct {
-	int	o_on;
-	char*	o_spec;
-	DevConf	o_cf;
-} confdata_t;
-
-static void
-parse_switch(confdata_t* cd, char* option)
-{
-	if(!strcmp("on", option))
-		cd->o_on = 1;
-	else if(!strcmp("off", option))
-		cd->o_on = 0;
-	else
-		error(Ebadarg);
-}
-
-static void
-parse_spec(confdata_t* cd, char* option)
-{
-	if(strlen(option) > 1) 
-		error(Ebadarg);
-	cd->o_spec = option;
-}
-
-static port_t*
-getnewport(DevConf* dc)
-{
-	port_t *p;
-
-	p = (port_t *)malloc((dc->nports + 1) * sizeof(port_t));
-	if(dc->nports > 0){
-		memmove(p, dc->ports, dc->nports * sizeof(port_t));
-		free(dc->ports);
-	}
-	dc->ports = p;
-	p = &dc->ports[dc->nports++];
-	p->size = -1;
-	p->port = (ulong)-1;
-	return p;
-}
-
-static void
-parse_port(confdata_t* cd, char* option)
-{
-	char *e;
-	port_t *p;
-
-	if(cd->o_cf.nports == 0 || cd->o_cf.ports[cd->o_cf.nports-1].port != (ulong)-1)
-		p = getnewport(&cd->o_cf);
-	else
-		p = &cd->o_cf.ports[cd->o_cf.nports-1];
-	p->port = strtol(option, &e, 0);
-	if(e == nil || *e != '\0')
-		error(Ebadarg);
-}
-
-static void
-parse_size(confdata_t* cd, char* option)
-{
-	char *e;
-	port_t *p;
-
-	if(cd->o_cf.nports == 0 || cd->o_cf.ports[cd->o_cf.nports-1].size != -1)
-		p = getnewport(&cd->o_cf);
-	else
-		p = &cd->o_cf.ports[cd->o_cf.nports-1];
-	p->size = (int)strtol(option, &e, 0);
-	if(e == nil || *e != '\0')
-		error(Ebadarg);
-}
-
-static void
-parse_irq(confdata_t* cd, char* option)
-{
-	char *e;
-
-	cd->o_cf.interrupt = strtoul(option, &e, 0);
-	if(e == nil || *e != '\0')
-		error(Ebadarg);
-}
-
-static void
-parse_type(confdata_t* cd, char* option)
-{
-	cd->o_cf.type = option;
-}
-
-static struct {
-	char	*option;
-	void	(*parse)(confdata_t*, char*);
-} options[] = {
-	{ 	"switch",	parse_switch,	},
-	{	"spec",		parse_spec,	},
-	{	"port",		parse_port,	},
-	{	"size",		parse_size,	},
-	{	"irq",		parse_irq,	},
-	{	"type",		parse_type,	},
-};
-
-static long
-sdwrite(Chan* c, void* a, long n, vlong off)
-{
-	Cmdbuf *cb;
-	Cmdtab *ct;
-	SDreq *req;
-	SDunit *unit;
-	SDev *sdev;
-	ulong end, start;
-
-	switch(TYPE(c->qid)){
-	default:
-		error(Eperm);
-	case Qtopctl: {
-		confdata_t cd;
-		char buf[256], *field[Ncmd];
-		int nf, i, j;
-
-		memset(&cd, 0, sizeof(confdata_t));
-		if(n > sizeof(buf)-1) n = sizeof(buf)-1;
-		memmove(buf, a, n);
-		buf[n] = '\0';
-
-		cd.o_on = -1;
-		cd.o_spec = '\0';
-		memset(&cd.o_cf, 0, sizeof(DevConf));
-
-		nf = tokenize(buf, field, Ncmd);
-		for(i = 0; i < nf; i++){
-			char *opt = field[i++];
-			if(i >= nf)
-				error(Ebadarg);
-			for(j = 0; j != nelem(options); j++)
-				if(!strcmp(opt, options[j].option))
-					break;
-					
-			if(j == nelem(options))
-				error(Ebadarg);
-			options[j].parse(&cd, field[i]);
-		}
-
-		if(cd.o_on < 0) 
-			error(Ebadarg);
-
-		if(cd.o_on){
-			if(cd.o_spec == '\0' || cd.o_cf.nports == 0 || 
-			     cd.o_cf.interrupt == 0 || cd.o_cf.type == nil)
-				error(Ebadarg);
-		}
-		else{
-			if(cd.o_spec == '\0')
-				error(Ebadarg);
-		}
-
-		if(wpsddevtab.config == nil)
-			error("No configuration function");
-		wpsddevtab.config(cd.o_on, cd.o_spec, &cd.o_cf);
-		break;
-	}
-	case Qctl:
-		sdev = sdgetdev(DEV(c->qid));
-		if (sdev == nil)
-			error(Enonexist);
-		unit = sdev->unit[UNIT(c->qid)];
-
-		cb = parsecmd(a, n);
-		qlock(&unit->ctl);
-		if(waserror()){
-			qunlock(&unit->ctl);
-			decref(&sdev->r);
-			free(cb);
-			nexterror();
-		}
-		if(unit->vers != c->qid.vers)
-			error(Eio);
-
-		ct = lookupcmd(cb, ctlmsg, nelem(ctlmsg));
-		switch(ct->index) {
-		case CMpart:
-			if(unit->sectors == 0 && !sdinitpart(unit))
-				error(Eio);
-			start = strtoul(cb->f[2], 0, 0);
-			end = strtoul(cb->f[3], 0, 0);
-			sdaddpart(unit, cb->f[1], start, end);
-			break;
-		case CMdelpart:
-			sddelpart(unit, cb->f[1]);
-			break;
-		case CMwildcard:
-			if(unit->dev->ifc->wctl == nil)
-				error(Ebadctl);
-			unit->dev->ifc->wctl(unit, cb);
-			break;
-		}
-		poperror();
-		qunlock(&unit->ctl);
-		decref(&sdev->r);
-		free(cb);
-		break;
-
-	case Qraw:
-		sdev = sdgetdev(DEV(c->qid));
-		if(sdev == nil)
-			error(Enonexist);
-		unit = sdev->unit[UNIT(c->qid)];
-		qlock(&unit->raw);
-		if(waserror()){
-			qunlock(&unit->raw);
-			decref(&sdev->r);
-			nexterror();
-		}
-		switch(unit->state){
-		case Rawcmd:
-			if(n < 6 || n > sizeof(req->cmd))
-				error(Ebadarg);
-			if((req = malloc(sizeof(SDreq))) == nil)
-				error(Enomem);
-			req->unit = unit;
-			memmove(req->cmd, a, n);
-			req->clen = n;
-			req->flags = SDnosense;
-			req->status = ~0;
-
-			unit->req = req;
-			unit->state = Rawdata;
-			break;
-
-		case Rawstatus:
-			unit->state = Rawcmd;
-			free(unit->req);
-			unit->req = nil;
-			error(Ebadusefd);
-
-		case Rawdata:
-			if(unit->state != Rawdata)
-				error(Ebadusefd);
-			unit->state = Rawstatus;
-
-			unit->req->write = 1;
-			n = sdrio(unit->req, a, n);
-		}
-		qunlock(&unit->raw);
-		decref(&sdev->r);
-		poperror();
-		break;
-	case Qpart:
-		return sdio(c, 1, a, n, off);
-	}
-
-	return n;
-}
-
-static int
-sdwstat(Chan* c, uchar* dp, int n)
-{
-	Dir *d;
-	SDpart *pp;
-	SDperm *perm;
-	SDunit *unit;
-	SDev *sdev;
-
-	if(c->qid.type & QTDIR)
-		error(Eperm); 
-
-	sdev = sdgetdev(DEV(c->qid));
-	if (sdev == nil)
-		error(Enonexist);
-	unit = sdev->unit[UNIT(c->qid)];
-	qlock(&unit->ctl);
-	d = nil;
-	if(waserror()){
-		free(d);
-		qunlock(&unit->ctl);
-		decref(&sdev->r);
-		nexterror();
-	}
-
-	switch(TYPE(c->qid)){
-	default:
-		error(Eperm);
-	case Qctl:
-		perm = &unit->ctlperm;
-		break;
-	case Qraw:
-		perm = &unit->rawperm;
-		break;
-	case Qpart:
-		pp = &unit->part[PART(c->qid)];
-		if(unit->vers+pp->vers != c->qid.vers)
-			error(Enonexist);
-		perm = &pp->SDperm;
-		break;
-	}
-
-	if(strcmp(up->user, perm->user) && !iseve())
-		error(Eperm);
-
-	d = smalloc(sizeof(Dir)+n);
-	n = convM2D(dp, n, &d[0], (char*)&d[1]);
-	if(n == 0)
-		error(Eshortstat);
-	if(!emptystr(d[0].uid))
-		kstrdup(&perm->user, d[0].uid);
-	if(d[0].mode != ~0UL)
-		perm->perm = (perm->perm & ~0777) | (d[0].mode & 0777);
-
-	free(d);
-	qunlock(&unit->ctl);
-	decref(&sdev->r);
-	poperror();
-	return n;
-}
-
-static char
-getspec(char base)
-{
-	while(1){
-		int i;
-		SDev *sdev;
-
-		for(i = 0; i != ndevs; i++)
-			if((sdev = devs[i].dt_dev) != nil && (char)sdev->idno == base)
-				break;
-
-		if(i == ndevs)
-			return base;
-		base++;
-	}
-	return '\0';
-}
-
-static int
-configure(char* spec, DevConf* cf)
-{
-	ISAConf isa;
-	dev_t *_devs;
-	SDev *tail, *sdev, *(*probe)(DevConf*);
-	char *p, name[32];
-	int i, added_devs;
-
-	if((p = strchr(cf->type, '/')) != nil)
-		*p++ = '\0';
-
-	for(i = 0; sdifc[i] != nil; i++)
-		if(!strcmp(sdifc[i]->name, cf->type))
-			break;
-
-	if(sdifc[i] == nil)
-		error("type not found");
-	
-	if((probe = sdifc[i]->probe) == nil)
-		error("No probe function");
-
-	if(p){
-		/* Try to find the card on the ISA bus.  This code really belongs
-		     in sdata and I'll move it later.  Really! */
-		memset(&isa, 0, sizeof(isa));
-		isa.port = cf->ports[0].port;
-		isa.irq = cf->interrupt;
-
-		if(pcmspecial(p, &isa) < 0)
-			error("Cannot find controller");
-	}
-
-	qlock(&devslock);
-	if(waserror()){
-		qunlock(&devslock);
-		nexterror();
-	}
-	
-	for(i = 0; i != ndevs; i++)
-		if((sdev = devs[i].dt_dev) != nil && sdev->idno == *spec)
-			break;
-	if(i != ndevs)
-		error(Eexist);
-
-	if((sdev = (*probe)(cf)) == nil)
-		error("Cannot probe controller");
-	poperror();
-
-	added_devs = 0;
-	tail = sdev;
-	while(tail){
-		added_devs++;
-		tail = tail->next;
-	}
-	
-	_devs = (dev_t*)malloc((ndevs + added_devs) * sizeof(dev_t));
-	memmove(_devs, devs, ndevs * sizeof(dev_t));
-	free(devs);
-	devs = _devs;
-
-	while(sdev){
-		/* Assign `spec' to the device */
-		*spec = getspec(*spec);
-		snprint(name, sizeof(name), "sd%c", *spec);
-		kstrdup(&sdev->name, name);
-		sdev->idno = *spec;
-		sdev->unit = (SDunit **)malloc(sdev->nunit * sizeof(SDunit*));
-		sdev->unitflg = (int *)malloc(sdev->nunit * sizeof(int));
-		assert(sdev->unit && sdev->unitflg);
-
-		devs[ndevs].dt_dev = sdev;
-		devs[ndevs].dt_nunits = sdev->nunit;
-		sdev = sdev->next;
-		devs[ndevs].dt_dev->next = nil;
-		ndevs++;
-	}
-
-	qunlock(&devslock);
-	return 0;
-}
-
-static int
-unconfigure(char* spec)
-{
-	int i;	
-	SDev *sdev;
-
-	qlock(&devslock);
-	if(waserror()){
-		qunlock(&devslock);
-		nexterror();
-	}
-
-	sdev = nil;
-	for(i = 0; i != ndevs; i++)
-		if((sdev = devs[i].dt_dev) != nil && sdev->idno == *spec)
-			break;
-
-	if(i == ndevs)
-		error(Enonexist);
-
-	if(sdev->r.ref)
-		error(Einuse);
-
-	/* make sure no interrupts arrive anymore before removing resources */
-	if(sdev->enabled && sdev->ifc->disable)
-		sdev->ifc->disable(sdev);
-
-	/* we're alone and the device tab is locked; make the device unavailable */
-	memmove(&devs[i], &devs[ndevs - 1], sizeof(dev_t));
-	memset(&devs[ndevs - 1], 0, sizeof(dev_t));
-	ndevs--;
-
-	qunlock(&devslock);
-	poperror();
-
-	for(i = 0; i != sdev->nunit; i++)
-		if(sdev->unit[i]){
-			SDunit *unit = sdev->unit[i];
-
-			free(unit->name);
-			free(unit->user);
-			free(unit);
-		}
-
-	if(sdev->ifc->clear)
-		sdev->ifc->clear(sdev);
-	return 0;
-}
-
-static int
-sdconfig(int on, char* spec, DevConf* cf)
-{
-	if(on)
-		return configure(spec, cf);
-	return unconfigure(spec);
-}
-
-Dev wpwpsddevtab = {
-	'S',
-	"sd",
-
-	sdreset,
-	devinit,
-	devshutdown,
-	sdattach,
-	sdwalk,
-	sdstat,
-	sdopen,
-	devcreate,
-	sdclose,
-	sdread,
-	devbread,
-	sdwrite,
-	devbwrite,
-	devremove,
-	sdwstat,
-	devpower,
-	sdconfig,
-};