123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321322323324325326327328329330331332333334335336337338339340341342343344345346347348349350351352353354355356357358359360361362363364365366367368369370371372373374375376377378379380381382383384385386387388389390391392393394395396397398399400401402403404405406407408409410411412413414415416417418419420421422423424425426427428429430431432433434435436437438439440441442443444445446447448449450451452453454455456457458459460461462463464465466467468469470471472473474475476477478479480481482483484485486487488489490491492493494495496497498499500501502503504505506507508509510511512513514515516517518519520521522523524525526527528529530531532533534535536537538539540541542543544545546547548549550551552553554555556557558559560561562563564565566567568569570571572573574575576577578579580581582583584585586587588589590591592593594595596597598599600601602603604605606607608609610611612613614615616617618619620621622623624625626627628629630631632633634635636637638639640641642643644645646647648649650651652653654655656657658659660661662663664665666667668669670671672673674675676677678679680681682683684685686687688689690691692693694695696697698699700701702703704705706707708709710711712713714715716717718719720721722723724725726727728729730731732733734735736737738739740741742743744745746747748749750751752753754755756757758759760761762763764765766767768769770771772773774775776777778779780781782783784785786787788789790791792793794795796797798799800801802803804805806807808809810811812813814815816817818819820821822823824825826827828829830831832833834835836837838839840841842843844845846847848849850851852853854855856857858859860861862863864865866867868869870871872873874875876877878879880881882883884885886887888889890891892893894895896897898899900901902903904905906907908909910911912913914915916917918919920921922923924925926927928929930931932933934935936937938939940941942943944945946947948949950951952953954955956957958959960961962963964965966967968969970971972973974975976977978979980981982983984985986987988989990991992993994995996997998999100010011002100310041005100610071008100910101011101210131014101510161017101810191020102110221023102410251026102710281029103010311032103310341035103610371038103910401041104210431044104510461047104810491050105110521053105410551056105710581059106010611062106310641065106610671068106910701071107210731074107510761077107810791080108110821083108410851086108710881089109010911092109310941095109610971098109911001101110211031104110511061107110811091110111111121113111411151116111711181119112011211122112311241125112611271128112911301131113211331134113511361137113811391140114111421143114411451146114711481149115011511152115311541155115611571158115911601161116211631164116511661167116811691170117111721173117411751176117711781179118011811182118311841185118611871188118911901191119211931194119511961197119811991200120112021203120412051206120712081209121012111212121312141215121612171218121912201221122212231224122512261227122812291230123112321233123412351236123712381239124012411242124312441245124612471248124912501251125212531254125512561257125812591260126112621263126412651266126712681269127012711272127312741275127612771278127912801281128212831284128512861287128812891290129112921293129412951296129712981299130013011302130313041305130613071308130913101311131213131314131513161317131813191320132113221323132413251326132713281329133013311332133313341335133613371338133913401341134213431344134513461347134813491350135113521353135413551356135713581359136013611362136313641365136613671368136913701371137213731374137513761377137813791380138113821383138413851386138713881389139013911392139313941395139613971398139914001401140214031404140514061407140814091410141114121413141414151416141714181419142014211422142314241425142614271428142914301431143214331434143514361437143814391440144114421443144414451446144714481449145014511452145314541455145614571458145914601461146214631464146514661467146814691470147114721473147414751476147714781479148014811482148314841485148614871488148914901491149214931494149514961497149814991500150115021503150415051506150715081509151015111512151315141515151615171518151915201521152215231524152515261527152815291530153115321533153415351536153715381539154015411542154315441545154615471548154915501551155215531554155515561557155815591560156115621563156415651566156715681569157015711572157315741575157615771578157915801581158215831584158515861587158815891590159115921593159415951596159715981599160016011602160316041605160616071608160916101611161216131614161516161617161816191620162116221623162416251626162716281629163016311632163316341635163616371638163916401641164216431644 |
- /*
- * 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 sddevtab;
- extern SDifc* sdifc[];
- static char Echange[] = "media or partition has changed";
- static char devletters[] = "0123456789"
- "abcdefghijklmnopqrstuvwxyz"
- "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
- static SDev *devs[sizeof devletters-1];
- static QLock devslock;
- enum {
- Rawcmd,
- Rawdata,
- Rawstatus,
- };
- enum {
- Qtopdir = 1, /* top level directory */
- Qtopbase,
- Qtopctl = Qtopbase,
- 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, uvlong start, uvlong 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 void
- sdincvers(SDunit *unit)
- {
- int i;
- unit->vers++;
- if(unit->part){
- for(i = 0; i < unit->npart; i++){
- unit->part[i].valid = 0;
- unit->part[i].vers++;
- }
- }
- }
- static int
- sdinitpart(SDunit* unit)
- {
- int nf;
- uvlong start, end;
- char *f[4], *p, *q, buf[10];
- if(unit->sectors > 0){
- unit->sectors = unit->secsize = 0;
- sdincvers(unit);
- }
- 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){
- sdincvers(unit);
- 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 = strtoull(f[1], 0, 0);
- end = strtoull(f[2], 0, 0);
- if(!waserror()){
- sdaddpart(unit, f[0], start, end);
- poperror();
- }
- }
- }
- return 1;
- }
- static int
- sdindex(int idno)
- {
- char *p;
- p = strchr(devletters, idno);
- if(p == nil)
- return -1;
- return p-devletters;
- }
- static SDev*
- sdgetdev(int idno)
- {
- SDev *sdev;
- int i;
- if((i = sdindex(idno)) < 0)
- return nil;
- qlock(&devslock);
- if(sdev = devs[i])
- 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;
- 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;
- if(sdev->enabled == 0 && sdev->ifc->enable)
- sdev->ifc->enable(sdev);
- sdev->enabled = 1;
- /*
- * 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;
- /*
- * Probe all known controller types and register any devices found.
- */
- for(i = 0; sdifc[i] != nil; i++){
- if(sdifc[i]->pnp == nil || (sdev = sdifc[i]->pnp()) == nil)
- continue;
- sdadddevs(sdev);
- }
- }
- void
- sdadddevs(SDev *sdev)
- {
- int i, j, id;
- SDev *next;
- for(; sdev; sdev=next){
- next = sdev->next;
- sdev->unit = (SDunit**)malloc(sdev->nunit * sizeof(SDunit*));
- sdev->unitflg = (int*)malloc(sdev->nunit * sizeof(int));
- if(sdev->unit == nil || sdev->unitflg == nil){
- print("sdadddevs: out of memory\n");
- giveup:
- free(sdev->unit);
- free(sdev->unitflg);
- if(sdev->ifc->clear)
- sdev->ifc->clear(sdev);
- free(sdev);
- continue;
- }
- id = sdindex(sdev->idno);
- if(id == -1){
- print("sdadddevs: bad id number %d (%C)\n", id, id);
- goto giveup;
- }
- qlock(&devslock);
- for(i=0; i<nelem(devs); i++){
- if(devs[j = (id+i)%nelem(devs)] == nil){
- sdev->idno = devletters[j];
- devs[j] = sdev;
- snprint(sdev->name, sizeof sdev->name, "sd%c", devletters[j]);
- break;
- }
- }
- qunlock(&devslock);
- if(i == nelem(devs)){
- print("sdadddevs: out of device letters\n");
- goto giveup;
- }
- }
- }
- // void
- // sdrmdevs(SDev *sdev)
- // {
- // char buf[2];
- //
- // snprint(buf, sizeof buf, "%c", sdev->idno);
- // unconfigure(buf);
- // }
- static int
- sd2gen(Chan* c, int i, Dir* dp)
- {
- Qid q;
- uvlong 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) * 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;
- }
- return -1;
- }
- static int
- sdgen(Chan* c, char*, Dirtab*, int, int s, Dir* dp)
- {
- Qid q;
- uvlong l;
- int i, r;
- SDpart *pp;
- SDunit *unit;
- SDev *sdev;
- switch(TYPE(c->qid)){
- case Qtopdir:
- if(s == DEVDOTDOT){
- mkqid(&q, QID(0, 0, 0, Qtopdir), 0, QTDIR);
- sprint(up->genbuf, "#%C", sddevtab.dc);
- devdir(c, q, up->genbuf, 0, eve, 0555, dp);
- return 1;
- }
- if(s+Qtopbase < Qunitdir)
- return sd1gen(c, s+Qtopbase, dp);
- s -= (Qunitdir-Qtopbase);
- qlock(&devslock);
- for(i=0; i<nelem(devs); i++){
- if(devs[i]){
- if(s < devs[i]->nunit)
- break;
- s -= devs[i]->nunit;
- }
- }
- if(i == nelem(devs)){
- /* Run off the end of the list */
- qunlock(&devslock);
- return -1;
- }
- if((sdev = devs[i]) == 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, 0, 0, Qtopdir), 0, QTDIR);
- sprint(up->genbuf, "#%C", sddevtab.dc);
- devdir(c, q, up->genbuf, 0, eve, 0555, dp);
- return 1;
- }
- if((sdev = sdgetdev(DEV(c->qid))) == nil){
- devdir(c, c->qid, "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) * 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:
- 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;
- if(*spec == '\0'){
- c = devattach(sddevtab.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);
- if((sdev=sdgetdev(idno)) == nil)
- error(Enonexist);
- if(sdgetunit(sdev, subno) == nil){
- decref(&sdev->r);
- error(Enonexist);
- }
- c = devattach(sddevtab.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;
- decref(&sdev->r);
- error(Einuse);
- }
- unit->state = Rawcmd;
- break;
- case Qpart:
- qlock(&unit->ctl);
- if(waserror()){
- qunlock(&unit->ctl);
- c->flag &= ~COPEN;
- decref(&sdev->r);
- 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
- sdbio(Chan* c, int write, char* a, long len, uvlong off)
- {
- int nchange;
- long l;
- uchar *b;
- SDpart *pp;
- SDunit *unit;
- SDev *sdev;
- ulong max, nb, offset;
- uvlong bno;
- sdev = sdgetdev(DEV(c->qid));
- if(sdev == nil){
- decref(&sdev->r);
- 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(Echange);
- /*
- * 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 = sdmalloc(nb*unit->secsize);
- if(b == nil)
- error(Enomem);
- if(waserror()){
- sdfree(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);
- }
- sdfree(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 = sdmalloc(n)) == nil)
- error(Enomem);
- if(r->write)
- memmove(data, a, n);
- }
- r->data = data;
- r->dlen = n;
- if(waserror()){
- sdfree(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);
- sdfree(data);
- r->data = nil;
- poperror();
- return r->rlen;
- }
- /*
- * SCSI simulation for non-SCSI devices
- */
- int
- sdsetsense(SDreq *r, int status, int key, int asc, int ascq)
- {
- int len;
- SDunit *unit;
- unit = r->unit;
- unit->sense[2] = key;
- unit->sense[12] = asc;
- unit->sense[13] = ascq;
- r->status = status;
- if(status == SDcheck && !(r->flags & SDnosense)){
- /* request sense case from sdfakescsi */
- len = sizeof unit->sense;
- if(len > sizeof r->sense-1)
- len = sizeof r->sense-1;
- memmove(r->sense, unit->sense, len);
- unit->sense[2] = 0;
- unit->sense[12] = 0;
- unit->sense[13] = 0;
- r->flags |= SDvalidsense;
- return SDok;
- }
- return status;
- }
- int
- sdmodesense(SDreq *r, uchar *cmd, void *info, int ilen)
- {
- int len;
- uchar *data;
- /*
- * Fake a vendor-specific request with page code 0,
- * return the drive info.
- */
- if((cmd[2] & 0x3F) != 0 && (cmd[2] & 0x3F) != 0x3F)
- return sdsetsense(r, SDcheck, 0x05, 0x24, 0);
- len = (cmd[7]<<8)|cmd[8];
- if(len == 0)
- return SDok;
- if(len < 8+ilen)
- return sdsetsense(r, SDcheck, 0x05, 0x1A, 0);
- if(r->data == nil || r->dlen < len)
- return sdsetsense(r, SDcheck, 0x05, 0x20, 1);
- data = r->data;
- memset(data, 0, 8);
- data[0] = ilen>>8;
- data[1] = ilen;
- if(ilen)
- memmove(data+8, info, ilen);
- r->rlen = 8+ilen;
- return sdsetsense(r, SDok, 0, 0, 0);
- }
- int
- sdfakescsi(SDreq *r, void *info, int ilen)
- {
- uchar *cmd, *p;
- uvlong len;
- SDunit *unit;
- cmd = r->cmd;
- r->rlen = 0;
- unit = r->unit;
- /*
- * Rewrite read(6)/write(6) into read(10)/write(10).
- */
- switch(cmd[0]){
- case 0x08: /* read */
- case 0x0A: /* write */
- cmd[9] = 0;
- cmd[8] = cmd[4];
- cmd[7] = 0;
- cmd[6] = 0;
- cmd[5] = cmd[3];
- cmd[4] = cmd[2];
- cmd[3] = cmd[1] & 0x0F;
- cmd[2] = 0;
- cmd[1] &= 0xE0;
- cmd[0] |= 0x20;
- break;
- }
- /*
- * Map SCSI commands into ATA commands for discs.
- * Fail any command with a LUN except INQUIRY which
- * will return 'logical unit not supported'.
- */
- if((cmd[1]>>5) && cmd[0] != 0x12)
- return sdsetsense(r, SDcheck, 0x05, 0x25, 0);
- switch(cmd[0]){
- default:
- return sdsetsense(r, SDcheck, 0x05, 0x20, 0);
- case 0x00: /* test unit ready */
- return sdsetsense(r, SDok, 0, 0, 0);
- case 0x03: /* request sense */
- if(cmd[4] < sizeof unit->sense)
- len = cmd[4];
- else
- len = sizeof unit->sense;
- if(r->data && r->dlen >= len){
- memmove(r->data, unit->sense, len);
- r->rlen = len;
- }
- return sdsetsense(r, SDok, 0, 0, 0);
- case 0x12: /* inquiry */
- if(cmd[4] < sizeof unit->inquiry)
- len = cmd[4];
- else
- len = sizeof unit->inquiry;
- if(r->data && r->dlen >= len){
- memmove(r->data, unit->inquiry, len);
- r->rlen = len;
- }
- return sdsetsense(r, SDok, 0, 0, 0);
- case 0x1B: /* start/stop unit */
- /*
- * nop for now, can use power management later.
- */
- return sdsetsense(r, SDok, 0, 0, 0);
- case 0x25: /* read capacity */
- if((cmd[1] & 0x01) || cmd[2] || cmd[3])
- return sdsetsense(r, SDcheck, 0x05, 0x24, 0);
- if(r->data == nil || r->dlen < 8)
- return sdsetsense(r, SDcheck, 0x05, 0x20, 1);
- /*
- * Read capacity returns the LBA of the last sector.
- */
- len = unit->sectors - 1;
- p = r->data;
- *p++ = len>>24;
- *p++ = len>>16;
- *p++ = len>>8;
- *p++ = len;
- len = 512;
- *p++ = len>>24;
- *p++ = len>>16;
- *p++ = len>>8;
- *p++ = len;
- r->rlen = p - (uchar*)r->data;
- return sdsetsense(r, SDok, 0, 0, 0);
- case 0x9E: /* long read capacity */
- if((cmd[1] & 0x01) || cmd[2] || cmd[3])
- return sdsetsense(r, SDcheck, 0x05, 0x24, 0);
- if(r->data == nil || r->dlen < 8)
- return sdsetsense(r, SDcheck, 0x05, 0x20, 1);
- /*
- * Read capcity returns the LBA of the last sector.
- */
- len = unit->sectors - 1;
- p = r->data;
- *p++ = len>>56;
- *p++ = len>>48;
- *p++ = len>>40;
- *p++ = len>>32;
- *p++ = len>>24;
- *p++ = len>>16;
- *p++ = len>>8;
- *p++ = len;
- len = 512;
- *p++ = len>>24;
- *p++ = len>>16;
- *p++ = len>>8;
- *p++ = len;
- r->rlen = p - (uchar*)r->data;
- return sdsetsense(r, SDok, 0, 0, 0);
- case 0x5A: /* mode sense */
- return sdmodesense(r, cmd, info, ilen);
- case 0x28: /* read */
- case 0x2A: /* write */
- case 0x88: /* read16 */
- case 0x8a: /* write16 */
- return SDnostatus;
- }
- }
- 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, m, status;
- offset = off;
- switch(TYPE(c->qid)){
- default:
- error(Eperm);
- case Qtopctl:
- m = 64*1024; /* room for register dumps */
- p = buf = malloc(m);
- assert(p);
- e = p + m;
- qlock(&devslock);
- for(i = 0; i < nelem(devs); i++){
- sdev = devs[i];
- if(sdev && sdev->ifc->rtopctl)
- p = sdev->ifc->rtopctl(sdev, p, e);
- }
- 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)];
- m = 16*1024; /* room for register dumps */
- p = malloc(m);
- l = snprint(p, m, "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, m-l);
- if(unit->sectors == 0)
- sdinitpart(unit);
- if(unit->sectors){
- if(unit->dev->ifc->rctl == nil)
- l += snprint(p+l, m-l,
- "geometry %llud %lud\n",
- unit->sectors, unit->secsize);
- pp = unit->part;
- for(i = 0; i < unit->npart; i++){
- if(pp->valid)
- l += snprint(p+l, m-l,
- "part %s %llud %llud\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 sdbio(c, 0, a, n, off);
- }
- }
- static void legacytopctl(Cmdbuf*);
- static long
- sdwrite(Chan* c, void* a, long n, vlong off)
- {
- char *f0;
- int i;
- uvlong end, start;
- Cmdbuf *cb;
- SDifc *ifc;
- SDreq *req;
- SDunit *unit;
- SDev *sdev;
- switch(TYPE(c->qid)){
- default:
- error(Eperm);
- case Qtopctl:
- cb = parsecmd(a, n);
- if(waserror()){
- free(cb);
- nexterror();
- }
- if(cb->nf == 0)
- error("empty control message");
- f0 = cb->f[0];
- cb->f++;
- cb->nf--;
- if(strcmp(f0, "config") == 0){
- /* wormhole into ugly legacy interface */
- legacytopctl(cb);
- poperror();
- free(cb);
- break;
- }
- /*
- * "ata arg..." invokes sdifc[i]->wtopctl(nil, cb),
- * where sdifc[i]->name=="ata" and cb contains the args.
- */
- ifc = nil;
- sdev = nil;
- for(i=0; sdifc[i]; i++){
- if(strcmp(sdifc[i]->name, f0) == 0){
- ifc = sdifc[i];
- sdev = nil;
- goto subtopctl;
- }
- }
- /*
- * "sd1 arg..." invokes sdifc[i]->wtopctl(sdev, cb),
- * where sdifc[i] and sdev match controller letter "1",
- * and cb contains the args.
- */
- if(f0[0]=='s' && f0[1]=='d' && f0[2] && f0[3] == 0){
- if((sdev = sdgetdev(f0[2])) != nil){
- ifc = sdev->ifc;
- goto subtopctl;
- }
- }
- error("unknown interface");
- subtopctl:
- if(waserror()){
- if(sdev)
- decref(&sdev->r);
- nexterror();
- }
- if(ifc->wtopctl)
- ifc->wtopctl(sdev, cb);
- else
- error(Ebadctl);
- poperror();
- poperror();
- if (sdev)
- decref(&sdev->r);
- free(cb);
- break;
- case Qctl:
- cb = parsecmd(a, n);
- sdev = sdgetdev(DEV(c->qid));
- if(sdev == nil)
- error(Enonexist);
- unit = sdev->unit[UNIT(c->qid)];
- qlock(&unit->ctl);
- if(waserror()){
- qunlock(&unit->ctl);
- decref(&sdev->r);
- free(cb);
- nexterror();
- }
- if(unit->vers != c->qid.vers)
- error(Echange);
- if(cb->nf < 1)
- error(Ebadctl);
- if(strcmp(cb->f[0], "part") == 0){
- if(cb->nf != 4)
- error(Ebadctl);
- if(unit->sectors == 0 && !sdinitpart(unit))
- error(Eio);
- start = strtoull(cb->f[2], 0, 0);
- end = strtoull(cb->f[3], 0, 0);
- sdaddpart(unit, cb->f[1], start, end);
- }
- else if(strcmp(cb->f[0], "delpart") == 0){
- if(cb->nf != 2 || unit->part == nil)
- error(Ebadctl);
- sddelpart(unit, cb->f[1]);
- }
- else if(unit->dev->ifc->wctl)
- unit->dev->ifc->wctl(unit, cb);
- else
- error(Ebadctl);
- qunlock(&unit->ctl);
- decref(&sdev->r);
- poperror();
- 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:
- unit->state = Rawstatus;
- unit->req->write = 1;
- n = sdrio(unit->req, a, n);
- }
- qunlock(&unit->raw);
- decref(&sdev->r);
- poperror();
- break;
- case Qpart:
- return sdbio(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 int
- configure(char* spec, DevConf* cf)
- {
- SDev *s, *sdev;
- char *p;
- int i;
- if(sdindex(*spec) < 0)
- error("bad sd spec");
- if((p = strchr(cf->type, '/')) != nil)
- *p++ = '\0';
- for(i = 0; sdifc[i] != nil; i++)
- if(strcmp(sdifc[i]->name, cf->type) == 0)
- break;
- if(sdifc[i] == nil)
- error("sd type not found");
- if(p)
- *(p-1) = '/';
- if(sdifc[i]->probe == nil)
- error("sd type cannot probe");
- sdev = sdifc[i]->probe(cf);
- for(s=sdev; s; s=s->next)
- s->idno = *spec;
- sdadddevs(sdev);
- return 0;
- }
- static int
- unconfigure(char* spec)
- {
- int i;
- SDev *sdev;
- SDunit *unit;
- if((i = sdindex(*spec)) < 0)
- error(Enonexist);
- qlock(&devslock);
- if((sdev = devs[i]) == nil){
- qunlock(&devslock);
- error(Enonexist);
- }
- if(sdev->r.ref){
- qunlock(&devslock);
- error(Einuse);
- }
- devs[i] = nil;
- qunlock(&devslock);
- /* make sure no interrupts arrive anymore before removing resources */
- if(sdev->enabled && sdev->ifc->disable)
- sdev->ifc->disable(sdev);
- for(i = 0; i != sdev->nunit; i++){
- if(unit = sdev->unit[i]){
- free(unit->name);
- free(unit->user);
- free(unit);
- }
- }
- if(sdev->ifc->clear)
- sdev->ifc->clear(sdev);
- free(sdev);
- return 0;
- }
- static int
- sdconfig(int on, char* spec, DevConf* cf)
- {
- if(on)
- return configure(spec, cf);
- return unconfigure(spec);
- }
- Dev sddevtab = {
- 'S',
- "sd",
- sdreset,
- devinit,
- devshutdown,
- sdattach,
- sdwalk,
- sdstat,
- sdopen,
- devcreate,
- sdclose,
- sdread,
- devbread,
- sdwrite,
- devbwrite,
- devremove,
- sdwstat,
- devpower,
- sdconfig,
- };
- /*
- * This is wrong for so many reasons. This code must go.
- */
- typedef struct Confdata Confdata;
- struct Confdata {
- int on;
- char* spec;
- DevConf cf;
- };
- static void
- parseswitch(Confdata* cd, char* option)
- {
- if(!strcmp("on", option))
- cd->on = 1;
- else if(!strcmp("off", option))
- cd->on = 0;
- else
- error(Ebadarg);
- }
- static void
- parsespec(Confdata* cd, char* option)
- {
- if(strlen(option) > 1)
- error(Ebadarg);
- cd->spec = option;
- }
- static Devport*
- getnewport(DevConf* dc)
- {
- Devport *p;
- p = (Devport *)malloc((dc->nports + 1) * sizeof(Devport));
- if(dc->nports > 0){
- memmove(p, dc->ports, dc->nports * sizeof(Devport));
- free(dc->ports);
- }
- dc->ports = p;
- p = &dc->ports[dc->nports++];
- p->size = -1;
- p->port = (ulong)-1;
- return p;
- }
- static void
- parseport(Confdata* cd, char* option)
- {
- char *e;
- Devport *p;
- if(cd->cf.nports == 0 || cd->cf.ports[cd->cf.nports-1].port != (ulong)-1)
- p = getnewport(&cd->cf);
- else
- p = &cd->cf.ports[cd->cf.nports-1];
- p->port = strtol(option, &e, 0);
- if(e == nil || *e != '\0')
- error(Ebadarg);
- }
- static void
- parsesize(Confdata* cd, char* option)
- {
- char *e;
- Devport *p;
- if(cd->cf.nports == 0 || cd->cf.ports[cd->cf.nports-1].size != -1)
- p = getnewport(&cd->cf);
- else
- p = &cd->cf.ports[cd->cf.nports-1];
- p->size = (int)strtol(option, &e, 0);
- if(e == nil || *e != '\0')
- error(Ebadarg);
- }
- static void
- parseirq(Confdata* cd, char* option)
- {
- char *e;
- cd->cf.intnum = strtoul(option, &e, 0);
- if(e == nil || *e != '\0')
- error(Ebadarg);
- }
- static void
- parsetype(Confdata* cd, char* option)
- {
- cd->cf.type = option;
- }
- static struct {
- char *name;
- void (*parse)(Confdata*, char*);
- } options[] = {
- "switch", parseswitch,
- "spec", parsespec,
- "port", parseport,
- "size", parsesize,
- "irq", parseirq,
- "type", parsetype,
- };
- static void
- legacytopctl(Cmdbuf *cb)
- {
- char *opt;
- int i, j;
- Confdata cd;
- memset(&cd, 0, sizeof cd);
- cd.on = -1;
- for(i=0; i<cb->nf; i+=2){
- if(i+2 > cb->nf)
- error(Ebadarg);
- opt = cb->f[i];
- for(j=0; j<nelem(options); j++)
- if(strcmp(opt, options[j].name) == 0){
- options[j].parse(&cd, cb->f[i+1]);
- break;
- }
- if(j == nelem(options))
- error(Ebadarg);
- }
- /* this has been rewritten to accomodate sdaoe */
- if(cd.on < 0 || cd.spec == 0)
- error(Ebadarg);
- if(cd.on && cd.cf.type == nil)
- error(Ebadarg);
- sdconfig(cd.on, cd.spec, &cd.cf);
- }
|