ref: cd747191012d0420ac631340d962da1f80cef0a5
dir: /sys/src/cmd/cdfs/main.c/
/* cdfs - CD, DVD and BD reader and writer file system */
#include <u.h>
#include <libc.h>
#include <auth.h>
#include <fcall.h>
#include <thread.h>
#include <9p.h>
#include <disk.h>
#include "dat.h"
#include "fns.h"
typedef struct Aux Aux;
struct Aux {
int doff;
Otrack *o;
};
ulong getnwa(Drive *);
static void checktoc(Drive*);
int vflag;
static Drive *drive;
static int nchange;
enum {
Qdir = 0,
Qctl = 1,
Qwa = 2,
Qwd = 3,
Qtrack = 4,
};
char*
geterrstr(void)
{
static char errbuf[ERRMAX];
rerrstr(errbuf, sizeof errbuf);
return errbuf;
}
void*
emalloc(ulong sz)
{
void *v;
v = mallocz(sz, 1);
if(v == nil)
sysfatal("malloc %lud fails", sz);
return v;
}
static void
fsattach(Req *r)
{
char *spec;
spec = r->ifcall.aname;
if(spec && spec[0]) {
respond(r, "invalid attach specifier");
return;
}
checktoc(drive);
r->fid->qid = (Qid){Qdir, drive->nchange, QTDIR};
r->ofcall.qid = r->fid->qid;
r->fid->aux = emalloc(sizeof(Aux));
respond(r, nil);
}
static char*
fsclone(Fid *old, Fid *new)
{
Aux *na;
na = emalloc(sizeof(Aux));
*na = *((Aux*)old->aux);
if(na->o)
na->o->nref++;
new->aux = na;
return nil;
}
static char*
fswalk1(Fid *fid, char *name, Qid *qid)
{
int i;
checktoc(drive);
switch((ulong)fid->qid.path) {
case Qdir:
if(strcmp(name, "..") == 0) {
*qid = (Qid){Qdir, drive->nchange, QTDIR};
return nil;
}
if(strcmp(name, "ctl") == 0) {
*qid = (Qid){Qctl, 0, 0};
return nil;
}
if(strcmp(name, "wa") == 0 && drive->writeok &&
(drive->mmctype == Mmcnone ||
drive->mmctype == Mmccd)) {
*qid = (Qid){Qwa, drive->nchange, QTDIR};
return nil;
}
if(strcmp(name, "wd") == 0 && drive->writeok) {
*qid = (Qid){Qwd, drive->nchange, QTDIR};
return nil;
}
for(i=0; i<drive->ntrack; i++)
if(strcmp(drive->track[i].name, name) == 0)
break;
if(i == drive->ntrack)
return "file not found";
*qid = (Qid){Qtrack+i, 0, 0};
return nil;
case Qwa:
case Qwd:
if(strcmp(name, "..") == 0) {
*qid = (Qid){Qdir, drive->nchange, QTDIR};
return nil;
}
return "file not found";
default: /* bug: lib9p could handle this */
return "walk in non-directory";
}
}
static void
fscreate(Req *r)
{
int omode, type;
Otrack *o;
Fid *fid;
fid = r->fid;
omode = r->ifcall.mode;
if(omode != OWRITE) {
respond(r, "bad mode (use OWRITE)");
return;
}
switch((ulong)fid->qid.path) {
case Qdir:
default:
respond(r, "permission denied");
return;
case Qwa:
if (drive->mmctype != Mmcnone &&
drive->mmctype != Mmccd) {
respond(r, "audio supported only on cd");
return;
}
type = TypeAudio;
break;
case Qwd:
type = TypeData;
break;
}
if((drive->cap & Cwrite) == 0) {
respond(r, "drive does not write");
return;
}
o = drive->create(drive, type);
if(o == nil) {
respond(r, geterrstr());
return;
}
drive->nchange = -1;
checktoc(drive); /* update directory info */
o->nref = 1;
((Aux*)fid->aux)->o = o;
fid->qid = (Qid){Qtrack+(o->track - drive->track), drive->nchange, 0};
r->ofcall.qid = fid->qid;
respond(r, nil);
}
static void
fsremove(Req *r)
{
switch((ulong)r->fid->qid.path){
case Qwa:
case Qwd:
if(drive->fixate(drive) < 0)
respond(r, geterrstr());
// let us see if it can figure this out: drive->writeok = No;
else
respond(r, nil);
checktoc(drive);
break;
default:
respond(r, "permission denied");
break;
}
}
/* result is one word, so it can be used as a uid in Dir structs */
char *
disctype(Drive *drive)
{
char *type, *rw;
switch (drive->mmctype) {
case Mmccd:
type = "cd-";
break;
case Mmcdvdminus:
case Mmcdvdplus:
type = drive->dvdtype;
break;
case Mmcbd:
type = "bd-";
break;
case Mmcnone:
type = "no-disc";
break;
default:
type = "**GOK**"; /* traditional */
break;
}
rw = "";
if (drive->mmctype != Mmcnone && drive->dvdtype == nil)
if (drive->erasable == Yes)
rw = drive->mmctype == Mmcbd? "re": "rw";
else if (drive->recordable == Yes)
rw = "r";
else
rw = "rom";
return smprint("%s%s", type, rw);
}
int
fillstat(ulong qid, Dir *d)
{
char *ty;
Track *t;
static char buf[32];
nulldir(d);
d->type = L'M';
d->dev = 1;
d->length = 0;
ty = disctype(drive);
strncpy(buf, ty, sizeof buf);
free(ty);
d->uid = d->gid = buf;
d->muid = "";
d->qid = (Qid){qid, drive->nchange, 0};
d->atime = time(0);
d->mtime = drive->changetime;
switch(qid){
case Qdir:
d->name = "/";
d->qid.type = QTDIR;
d->mode = DMDIR|0777;
break;
case Qctl:
d->name = "ctl";
d->mode = 0666;
break;
case Qwa:
if(drive->writeok == No ||
drive->mmctype != Mmcnone &&
drive->mmctype != Mmccd)
return 0;
d->name = "wa";
d->qid.type = QTDIR;
d->mode = DMDIR|0777;
break;
case Qwd:
if(drive->writeok == No)
return 0;
d->name = "wd";
d->qid.type = QTDIR;
d->mode = DMDIR|0777;
break;
default:
if(qid-Qtrack >= drive->ntrack)
return 0;
t = &drive->track[qid-Qtrack];
if(strcmp(t->name, "") == 0)
return 0;
d->name = t->name;
d->mode = t->mode;
d->length = t->size;
break;
}
return 1;
}
static ulong
cddb_sum(int n)
{
int ret;
ret = 0;
while(n > 0) {
ret += n%10;
n /= 10;
}
return ret;
}
static ulong
diskid(Drive *d)
{
int i, n;
ulong tmp;
Msf *ms, *me;
n = 0;
for(i=0; i < d->ntrack; i++)
n += cddb_sum(d->track[i].mbeg.m*60+d->track[i].mbeg.s);
ms = &d->track[0].mbeg;
me = &d->track[d->ntrack].mbeg;
tmp = (me->m*60+me->s) - (ms->m*60+ms->s);
/*
* the spec says n%0xFF rather than n&0xFF. it's unclear which is
* correct. most CDs are in the database under both entries.
*/
return ((n % 0xFF) << 24 | (tmp << 8) | d->ntrack);
}
static void
readctl(Req *r)
{
int i, isaudio;
ulong nwa;
char *p, *e, *ty;
char s[1024];
Msf *m;
isaudio = 0;
for(i=0; i<drive->ntrack; i++)
if(drive->track[i].type == TypeAudio)
isaudio = 1;
p = s;
e = s + sizeof s;
*p = '\0';
if(isaudio){
p = seprint(p, e, "aux/cddb query %8.8lux %d", diskid(drive),
drive->ntrack);
for(i=0; i<drive->ntrack; i++){
m = &drive->track[i].mbeg;
p = seprint(p, e, " %d", (m->m*60 + m->s)*75 + m->f);
}
m = &drive->track[drive->ntrack].mbeg;
p = seprint(p, e, " %d\n", m->m*60 + m->s);
}
if(drive->readspeed == drive->writespeed)
p = seprint(p, e, "speed %d\n", drive->readspeed);
else
p = seprint(p, e, "speed read %d write %d\n",
drive->readspeed, drive->writespeed);
p = seprint(p, e, "maxspeed read %d write %d\n",
drive->maxreadspeed, drive->maxwritespeed);
if (drive->Scsi.changetime != 0 && drive->ntrack != 0) { /* have disc? */
ty = disctype(drive);
p = seprint(p, e, "%s", ty);
free(ty);
if (drive->mmctype != Mmcnone) {
nwa = getnwa(drive);
p = seprint(p, e, " next writable sector ");
if (nwa == ~0ul)
p = seprint(p, e, "none; disc full");
else
p = seprint(p, e, "%lud", nwa);
}
seprint(p, e, "\n");
}
readstr(r, s);
}
static void
fsread(Req *r)
{
int j, n, m;
uchar *p, *ep;
Dir d;
Fid *fid;
Otrack *o;
vlong offset;
void *buf;
long count;
Aux *a;
fid = r->fid;
offset = r->ifcall.offset;
buf = r->ofcall.data;
count = r->ifcall.count;
switch((ulong)fid->qid.path) {
case Qdir:
checktoc(drive);
p = buf;
ep = p+count;
m = Qtrack+drive->ntrack;
a = fid->aux;
if(offset == 0)
a->doff = 1; /* skip root */
for(j=a->doff; j<m; j++) {
if(fillstat(j, &d)) {
if((n = convD2M(&d, p, ep-p)) <= BIT16SZ)
break;
p += n;
}
}
a->doff = j;
r->ofcall.count = p - (uchar*)buf;
break;
case Qwa:
case Qwd:
r->ofcall.count = 0;
break;
case Qctl:
readctl(r);
break;
default:
/* a disk track; we can only call read for whole blocks */
o = ((Aux*)fid->aux)->o;
if((count = o->drive->read(o, buf, count, offset)) < 0) {
respond(r, geterrstr());
return;
}
r->ofcall.count = count;
break;
}
respond(r, nil);
}
static char Ebadmsg[] = "bad cdfs control message";
static char*
writectl(void *v, long count)
{
char buf[256];
char *f[10], *p;
int i, nf, n, r, w, what;
if(count >= sizeof(buf))
count = sizeof(buf)-1;
memmove(buf, v, count);
buf[count] = '\0';
nf = tokenize(buf, f, nelem(f));
if(nf == 0)
return Ebadmsg;
if(strcmp(f[0], "speed") == 0){
what = 0;
r = w = -1;
if(nf == 1)
return Ebadmsg;
for(i=1; i<nf; i++){
if(strcmp(f[i], "read") == 0 || strcmp(f[i], "write") == 0){
if(what!=0 && what!='?')
return Ebadmsg;
what = f[i][0];
}else{
if (strcmp(f[i], "best") == 0)
n = (1<<16) - 1;
else {
n = strtol(f[i], &p, 0);
if(*p != '\0' || n <= 0)
return Ebadmsg;
}
switch(what){
case 0:
if(r >= 0 || w >= 0)
return Ebadmsg;
r = w = n;
break;
case 'r':
if(r >= 0)
return Ebadmsg;
r = n;
break;
case 'w':
if(w >= 0)
return Ebadmsg;
w = n;
break;
default:
return Ebadmsg;
}
what = '?';
}
}
if(what != '?')
return Ebadmsg;
return drive->setspeed(drive, r, w);
}
return drive->ctl(drive, nf, f);
}
static void
fswrite(Req *r)
{
Otrack *o;
Fid *fid;
fid = r->fid;
r->ofcall.count = r->ifcall.count;
if(fid->qid.path == Qctl) {
respond(r, writectl(r->ifcall.data, r->ifcall.count));
return;
}
if((o = ((Aux*)fid->aux)->o) == nil || o->omode != OWRITE) {
respond(r, "permission denied");
return;
}
if(o->drive->write(o, r->ifcall.data, r->ifcall.count) < 0)
respond(r, geterrstr());
else
respond(r, nil);
}
static void
fsstat(Req *r)
{
fillstat((ulong)r->fid->qid.path, &r->d);
r->d.name = estrdup9p(r->d.name);
r->d.uid = estrdup9p(r->d.uid);
r->d.gid = estrdup9p(r->d.gid);
r->d.muid = estrdup9p(r->d.muid);
respond(r, nil);
}
static void
fsopen(Req *r)
{
int omode;
Fid *fid;
Otrack *o;
fid = r->fid;
omode = r->ifcall.mode;
checktoc(drive);
r->ofcall.qid = (Qid){fid->qid.path, drive->nchange, fid->qid.vers};
switch((ulong)fid->qid.path){
case Qdir:
case Qwa:
case Qwd:
if(omode != OREAD) {
respond(r, "permission denied");
return;
}
break;
case Qctl:
if(omode & ~(OTRUNC|OREAD|OWRITE|ORDWR)) {
respond(r, "permission denied");
return;
}
break;
default:
if(fid->qid.path >= Qtrack+drive->ntrack) {
respond(r, "file no longer exists");
return;
}
/*
* allow the open with OWRITE or ORDWR if the
* drive and disc are both capable?
*/
if(omode != OREAD ||
(o = drive->openrd(drive, fid->qid.path-Qtrack)) == nil) {
respond(r, "permission denied");
return;
}
o->nref = 1;
((Aux*)fid->aux)->o = o;
break;
}
respond(r, nil);
}
static void
fsdestroyfid(Fid *fid)
{
Aux *aux;
Otrack *o;
aux = fid->aux;
if(aux == nil)
return;
o = aux->o;
if(o && --o->nref == 0) {
bterm(o->buf);
drive->close(o);
checktoc(drive);
}
}
static void
checktoc(Drive *drive)
{
int i;
Track *t;
drive->gettoc(drive);
if(drive->nameok)
return;
for(i=0; i<drive->ntrack; i++) {
t = &drive->track[i];
if(t->size == 0) /* being created */
t->mode = 0;
else
t->mode = 0444;
sprint(t->name, "?%.3d", i);
switch(t->type){
case TypeNone:
t->name[0] = 'u';
// t->mode = 0;
break;
case TypeData:
t->name[0] = 'd';
break;
case TypeAudio:
t->name[0] = 'a';
break;
case TypeBlank:
t->name[0] = '\0';
break;
default:
print("unknown track type %d\n", t->type);
break;
}
}
drive->nameok = 1;
}
long
bufread(Otrack *t, void *v, long n, vlong off)
{
return bread(t->buf, v, n, off);
}
long
bufwrite(Otrack *t, void *v, long n)
{
return bwrite(t->buf, v, n);
}
Srv fs = {
.attach= fsattach,
.destroyfid= fsdestroyfid,
.clone= fsclone,
.walk1= fswalk1,
.open= fsopen,
.read= fsread,
.write= fswrite,
.create= fscreate,
.remove= fsremove,
.stat= fsstat,
};
void
usage(void)
{
fprint(2, "usage: cdfs [-Dv] [-d /dev/sdC0] [-m mtpt]\n");
exits("usage");
}
void
main(int argc, char **argv)
{
Scsi *s;
int fd;
char *dev, *mtpt;
dev = "/dev/sdD0";
mtpt = "/mnt/cd";
ARGBEGIN{
case 'D':
chatty9p++;
break;
case 'd':
dev = EARGF(usage());
break;
case 'm':
mtpt = EARGF(usage());
break;
case 'v':
if((fd = create("/tmp/cdfs.log", OWRITE, 0666)) >= 0) {
dup(fd, 2);
dup(fd, 1);
if(fd != 1 && fd != 2)
close(fd);
vflag++;
scsiverbose = 2; /* verbose but no Readtoc errs */
}
break;
default:
usage();
}ARGEND
if(dev == nil || mtpt == nil || argc > 0)
usage();
werrstr("");
if((s = openscsi(dev)) == nil)
sysfatal("openscsi '%s': %r", dev);
if((drive = mmcprobe(s)) == nil)
sysfatal("mmcprobe '%s': %r", dev);
checktoc(drive);
postmountsrv(&fs, nil, mtpt, MREPL|MCREATE);
exits(nil);
}