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#include <u.h>
#include <libc.h>
#include <auth.h>
#include <fcall.h>
#include <bio.h>
#include <ndb.h>
#include <thread.h>
/*
* This fs presents a 1 level file system. It contains
* up to three files per console (xxx and xxxctl and xxxstat)
*/
typedef struct Console Console;
typedef struct Fid Fid;
typedef struct Request Request;
typedef struct Reqlist Reqlist;
typedef struct Fs Fs;
enum
{
/* last 5 bits of qid.path */
Textern= 0, /* fake parent of top level */
Ttopdir, /* top level directory */
Qctl,
Qstat,
Qdata,
Bufsize= 32*1024, /* chars buffered per reader */
Maxcons= 64, /* maximum consoles */
Nhash= 64, /* Fid hash buckets */
};
#define TYPE(x) (((ulong)x.path) & 0xf)
#define CONS(x) ((((ulong)x.path) >> 4)&0xfff)
#define QID(c, x) (((c)<<4) | (x))
struct Request
{
Request *next;
Fid *fid;
Fs *fs;
Fcall f;
uchar buf[1];
};
struct Reqlist
{
Lock;
Request *first;
Request *last;
};
struct Fid
{
Lock;
Fid *next; /* hash list */
Fid *cnext; /* list of Fid's on a console */
int fid;
int ref;
int attached;
int open;
char *user;
char mbuf[Bufsize]; /* message */
int bufn;
int used;
Qid qid;
Console *c;
char buf[Bufsize];
char *rp;
char *wp;
Reqlist r; /* active read requests */
};
struct Console
{
Lock;
char *name;
char *dev;
int speed;
int cronly;
int ondemand; /* open only on demand */
int chat; /* chat consoles are special */
int pid; /* pid of reader */
int fd;
int cfd;
int sfd;
Fid *flist; /* open fids to broadcast to */
};
struct Fs
{
Lock;
int fd; /* to kernel mount point */
int messagesize;
Fid *hash[Nhash];
Console *cons[Maxcons];
int ncons;
};
extern void console(Fs*, char*, char*, int, int, int);
extern Fs* fsmount(char*);
extern void fsreader(void*);
extern void fsrun(void*);
extern Fid* fsgetfid(Fs*, int);
extern void fsputfid(Fs*, Fid*);
extern int fsdirgen(Fs*, Qid, int, Dir*, uchar*, int);
extern void fsreply(Fs*, Request*, char*);
extern void fskick(Fs*, Fid*);
extern int fsreopen(Fs*, Console*);
extern void fsversion(Fs*, Request*, Fid*);
extern void fsflush(Fs*, Request*, Fid*);
extern void fsauth(Fs*, Request*, Fid*);
extern void fsattach(Fs*, Request*, Fid*);
extern void fswalk(Fs*, Request*, Fid*);
extern void fsclwalk(Fs*, Request*, Fid*);
extern void fsopen(Fs*, Request*, Fid*);
extern void fscreate(Fs*, Request*, Fid*);
extern void fsread(Fs*, Request*, Fid*);
extern void fswrite(Fs*, Request*, Fid*);
extern void fsclunk(Fs*, Request*, Fid*);
extern void fsremove(Fs*, Request*, Fid*);
extern void fsstat(Fs*, Request*, Fid*);
extern void fswstat(Fs*, Request*, Fid*);
void (*fcall[])(Fs*, Request*, Fid*) =
{
[Tflush] fsflush,
[Tversion] fsversion,
[Tauth] fsauth,
[Tattach] fsattach,
[Twalk] fswalk,
[Topen] fsopen,
[Tcreate] fscreate,
[Tread] fsread,
[Twrite] fswrite,
[Tclunk] fsclunk,
[Tremove] fsremove,
[Tstat] fsstat,
[Twstat] fswstat
};
char Eperm[] = "permission denied";
char Eexist[] = "file does not exist";
char Enotdir[] = "not a directory";
char Eisopen[] = "file already open";
char Ebadcount[] = "bad read/write count";
char Enofid[] = "no such fid";
char *consoledb = "/lib/ndb/consoledb";
char *mntpt = "/mnt/consoles";
int messagesize = 8192+IOHDRSZ;
void
fatal(char *fmt, ...)
{
va_list arg;
char buf[1024];
write(2, "consolefs: ", 10);
va_start(arg, fmt);
vseprint(buf, buf+1024, fmt, arg);
va_end(arg);
write(2, buf, strlen(buf));
write(2, "\n", 1);
threadexitsall(fmt);
}
void*
emalloc(uint n)
{
void *p;
p = malloc(n);
if(p == nil)
fatal("malloc failed: %r");
memset(p, 0, n);
return p;
}
int debug;
Ndb *db;
/*
* any request that can get queued for a delayed reply
*/
Request*
allocreq(Fs *fs, int bufsize)
{
Request *r;
r = emalloc(sizeof(Request)+bufsize);
r->fs = fs;
r->next = nil;
return r;
}
/*
* for maintaining lists of requests
*/
void
addreq(Reqlist *l, Request *r)
{
lock(l);
if(l->first == nil)
l->first = r;
else
l->last->next = r;
l->last = r;
r->next = nil;
unlock(l);
}
/*
* remove the first request from a list of requests
*/
Request*
remreq(Reqlist *l)
{
Request *r;
lock(l);
r = l->first;
if(r != nil)
l->first = r->next;
unlock(l);
return r;
}
/*
* remove a request with the given tag from a list of requests
*/
Request*
remtag(Reqlist *l, int tag)
{
Request *or, **ll;
lock(l);
ll = &l->first;
for(or = *ll; or; or = or->next){
if(or->f.tag == tag){
*ll = or->next;
unlock(l);
return or;
}
ll = &or->next;
}
unlock(l);
return nil;
}
Qid
parentqid(Qid q)
{
if(q.type & QTDIR)
return (Qid){QID(0, Textern), 0, QTDIR};
else
return (Qid){QID(0, Ttopdir), 0, QTDIR};
}
int
fsdirgen(Fs *fs, Qid parent, int i, Dir *d, uchar *buf, int nbuf)
{
static char name[64];
char *p;
int xcons;
d->uid = d->gid = d->muid = "network";
d->length = 0;
d->atime = time(nil);
d->mtime = d->atime;
d->type = 'C';
d->dev = '0';
switch(TYPE(parent)){
case Textern:
if(i != 0)
return -1;
p = "consoles";
d->mode = DMDIR|0555;
d->qid.type = QTDIR;
d->qid.path = QID(0, Ttopdir);
d->qid.vers = 0;
break;
case Ttopdir:
xcons = i/3;
if(xcons >= fs->ncons)
return -1;
p = fs->cons[xcons]->name;
switch(i%3){
case 0:
if(fs->cons[xcons]->cfd < 0)
return 0;
snprint(name, sizeof name, "%sctl", p);
p = name;
d->qid.type = QTFILE;
d->qid.path = QID(xcons, Qctl);
d->qid.vers = 0;
break;
case 1:
if(fs->cons[xcons]->sfd < 0)
return 0;
snprint(name, sizeof name, "%sstat", p);
p = name;
d->qid.type = QTFILE;
d->qid.path = QID(xcons, Qstat);
d->qid.vers = 0;
break;
case 2:
d->qid.type = QTFILE;
d->qid.path = QID(xcons, Qdata);
d->qid.vers = 0;
break;
}
d->mode = 0666;
break;
default:
return -1;
}
d->name = p;
if(buf != nil)
return convD2M(d, buf, nbuf);
return 1;
}
/*
* mount the user interface and start a request processor
*/
Fs*
fsmount(char *mntpt)
{
Fs *fs;
int pfd[2], srv;
char buf[32];
int n;
static void *v[2];
fs = emalloc(sizeof(Fs));
if(pipe(pfd) < 0)
fatal("opening pipe: %r");
/* start up the file system process */
v[0] = fs;
v[1] = pfd;
proccreate(fsrun, v, 16*1024);
/* Typically mounted before /srv exists */
if(access("#s/consoles", AEXIST) < 0){
srv = create("#s/consoles", OWRITE, 0666);
if(srv < 0)
fatal("post: %r");
n = sprint(buf, "%d", pfd[1]);
if(write(srv, buf, n) < 0)
fatal("write srv: %r");
close(srv);
}
mount(pfd[1], -1, mntpt, MBEFORE, "");
close(pfd[1]);
return fs;
}
/*
* reopen a console
*/
int
fsreopen(Fs* fs, Console *c)
{
char buf[128];
static void *v[2];
if(c->pid){
if(postnote(PNPROC, c->pid, "reopen") != 0)
fprint(2, "postnote failed: %r\n");
c->pid = 0;
}
if(c->fd >= 0){
close(c->fd);
close(c->cfd);
close(c->sfd);
c->cfd = -1;
c->fd = -1;
c->sfd = -1;
}
if(c->flist == nil && c->ondemand)
return 0;
c->fd = open(c->dev, ORDWR);
if(c->fd < 0)
return -1;
snprint(buf, sizeof(buf), "%sctl", c->dev);
c->cfd = open(buf, ORDWR);
fprint(c->cfd, "b%d", c->speed);
snprint(buf, sizeof(buf), "%sstat", c->dev);
c->sfd = open(buf, OREAD);
v[0] = fs;
v[1] = c;
proccreate(fsreader, v, 16*1024);
return 0;
}
void
change(Fs *fs, Console *c, int doreopen, int speed, int cronly, int ondemand)
{
lock(c);
if(speed != c->speed){
c->speed = speed;
doreopen = 1;
}
if(ondemand != c->ondemand){
c->ondemand = ondemand;
doreopen = 1;
}
c->cronly = cronly;
if(doreopen)
fsreopen(fs, c);
unlock(c);
}
/*
* create a console interface
*/
void
console(Fs* fs, char *name, char *dev, int speed, int cronly, int ondemand)
{
Console *c;
char *x;
int i, doreopen;
if(fs->ncons >= Maxcons)
fatal("too many consoles, too little time");
doreopen = 0;
for(i = 0; i < fs->ncons; i++){
c = fs->cons[i];
if(strcmp(name, c->name) == 0){
if(strcmp(dev, c->dev) != 0){
/* new device */
x = c->dev;
c->dev = strdup(dev);
free(x);
doreopen = 1;
}
change(fs, c, doreopen, speed, cronly, ondemand);
return;
}
}
#ifdef sapedoesntlikethis
/*
* The code below prevents this from working. I can't
* think of scenarios where the code below actually helps
* Sape
*
* console=borneo dev=/dev/eia1
* speed=9600
* openondemand=1
* console=tottie dev=/dev/eia1
* speed=115200
* openondemand=1
*/
for(i = 0; i < fs->ncons; i++){
c = fs->cons[i];
if(strcmp(dev, c->dev) == 0){
/* at least a rename */
x = c->name;
c->name = strdup(name);
free(x);
change(fs, c, doreopen, speed, cronly, ondemand);
return;
}
}
#endif
c = emalloc(sizeof(Console));
fs->cons[fs->ncons] = c;
fs->ncons++;
c->name = strdup(name);
c->dev = strdup(dev);
if(strcmp(c->dev, "/dev/null") == 0)
c->chat = 1;
else
c->chat = 0;
c->fd = -1;
c->cfd = -1;
c->sfd = -1;
change(fs, c, 1, speed, cronly, ondemand);
}
/*
* buffer data from console to a client.
* circular q with writer able to catch up to reader.
* the reader may miss data but always sees an in order sequence.
*/
void
fromconsole(Fid *f, char *p, int n)
{
char *rp, *wp, *ep;
int pass;
lock(f);
rp = f->rp;
wp = f->wp;
ep = f->buf + sizeof(f->buf);
pass = 0;
while(n--){
*wp++ = *p++;
if(wp >= ep)
wp = f->buf;
if(rp == wp)
pass = 1;
}
f->wp = wp;
/* we overtook the read pointer, push it up so readers always
* see the tail of what was written
*/
if(pass){
wp++;
if(wp >= ep)
f->rp = f->buf;
else
f->rp = wp;
}
unlock(f);
}
/*
* broadcast a list of members to all listeners
*/
void
bcastmembers(Fs *fs, Console *c, char *msg, Fid *f)
{
int n;
Fid *fl;
char buf[512];
sprint(buf, "[%s%s", msg, f->user);
for(fl = c->flist; fl != nil && strlen(buf) + 64 < sizeof(buf); fl = fl->cnext){
if(f == fl)
continue;
strcat(buf, ", ");
strcat(buf, fl->user);
}
strcat(buf, "]\n");
n = strlen(buf);
for(fl = c->flist; fl; fl = fl->cnext){
fromconsole(fl, buf, n);
fskick(fs, fl);
}
}
void
handler(void*, char *msg)
{
if(strstr(msg, "reopen") != nil ||
strstr(msg, "write on closed pipe") != nil)
noted(NCONT);
noted(NDFLT);
}
/*
* a process to read console output and broadcast it (one per console)
*/
void
fsreader(void *v)
{
int n;
Fid *fl;
char buf[1024];
Fs *fs;
Console *c;
void **a;
a = v;
fs = a[0];
c = a[1];
c->pid = getpid();
notify(handler);
if(c->chat)
threadexits(nil);
for(;;){
n = read(c->fd, buf, sizeof(buf));
if(n < 0)
break;
lock(c);
for(fl = c->flist; fl; fl = fl->cnext){
fromconsole(fl, buf, n);
fskick(fs, fl);
}
unlock(c);
}
}
void
readdb(Fs *fs)
{
Ndbtuple *t, *nt;
char *dev, *cons;
int cronly, speed, ondemand;
ndbreopen(db);
/* start a listener for each console */
for(;;){
t = ndbparse(db);
if(t == nil)
break;
dev = nil;
cons = nil;
speed = 9600;
cronly = 0;
ondemand = 0;
for(nt = t; nt; nt = nt->entry){
if(strcmp(nt->attr, "console") == 0)
cons = nt->val;
else if(strcmp(nt->attr, "dev") == 0)
dev = nt->val;
else if(strcmp(nt->attr, "speed") == 0)
speed = atoi(nt->val);
else if(strcmp(nt->attr, "cronly") == 0)
cronly = 1;
else if(strcmp(nt->attr, "openondemand") == 0)
ondemand = 1;
}
if(dev != nil && cons != nil)
console(fs, cons, dev, speed, cronly, ondemand);
ndbfree(t);
}
}
int dbmtime;
/*
* a request processor (one per Fs)
*/
void
fsrun(void *v)
{
int n, t;
Request *r;
Fid *f;
Dir *d;
void **a = v;
Fs* fs;
int *pfd;
fs = a[0];
pfd = a[1];
fs->fd = pfd[0];
notify(handler);
for(;;){
d = dirstat(consoledb);
if(d != nil && d->mtime != dbmtime){
dbmtime = d->mtime;
readdb(fs);
}
free(d);
r = allocreq(fs, messagesize);
n = read9pmsg(fs->fd, r->buf, messagesize);
if(n <= 0)
fatal("unmounted");
if(convM2S(r->buf, n, &r->f) == 0){
fprint(2, "can't convert %ux %ux %ux\n", r->buf[0],
r->buf[1], r->buf[2]);
free(r);
continue;
}
f = fsgetfid(fs, r->f.fid);
r->fid = f;
if(debug)
fprint(2, "%F path %llux\n", &r->f, f->qid.path);
t = r->f.type;
r->f.type++;
(*fcall[t])(fs, r, f);
}
}
Fid*
fsgetfid(Fs *fs, int fid)
{
Fid *f, *nf;
lock(fs);
for(f = fs->hash[fid%Nhash]; f; f = f->next){
if(f->fid == fid){
f->ref++;
unlock(fs);
return f;
}
}
nf = emalloc(sizeof(Fid));
nf->next = fs->hash[fid%Nhash];
fs->hash[fid%Nhash] = nf;
nf->fid = fid;
nf->ref = 1;
nf->wp = nf->buf;
nf->rp = nf->wp;
unlock(fs);
return nf;
}
void
fsputfid(Fs *fs, Fid *f)
{
Fid **l, *nf;
lock(fs);
if(--f->ref > 0){
unlock(fs);
return;
}
for(l = &fs->hash[f->fid%Nhash]; nf = *l; l = &nf->next)
if(nf == f){
*l = f->next;
break;
}
unlock(fs);
free(f->user);
free(f);
}
void
fsauth(Fs *fs, Request *r, Fid*)
{
fsreply(fs, r, "consolefs: authentication not required");
}
void
fsversion(Fs *fs, Request *r, Fid*)
{
if(r->f.msize < 256){
fsreply(fs, r, "message size too small");
return;
}
messagesize = r->f.msize;
if(messagesize > 8192+IOHDRSZ)
messagesize = 8192+IOHDRSZ;
r->f.msize = messagesize;
if(strncmp(r->f.version, "9P2000", 6) != 0){
fsreply(fs, r, "unrecognized 9P version");
return;
}
r->f.version = "9P2000";
fsreply(fs, r, nil);
}
void
fsflush(Fs *fs, Request *r, Fid *f)
{
Request *or;
or = remtag(&f->r, r->f.oldtag);
if(or != nil){
fsputfid(fs, or->fid);
free(or);
}
fsreply(fs, r, nil);
}
void
fsattach(Fs *fs, Request *r, Fid *f)
{
f->qid.type = QTDIR;
f->qid.path = QID(0, Ttopdir);
f->qid.vers = 0;
if(r->f.uname[0])
f->user = strdup(r->f.uname);
else
f->user = strdup("none");
/* hold down the fid till the clunk */
f->attached = 1;
lock(fs);
f->ref++;
unlock(fs);
r->f.qid = f->qid;
fsreply(fs, r, nil);
}
void
fswalk(Fs *fs, Request *r, Fid *f)
{
char *name;
Dir d;
int i, n, nqid, nwname;
Qid qid, wqid[MAXWELEM];
Fid *nf;
char *err;
if(f->attached == 0){
fsreply(fs, r, Enofid);
return;
}
nf = nil;
if(r->f.fid != r->f.newfid){
nf = fsgetfid(fs, r->f.newfid);
nf->attached = f->attached;
nf->open = f->open;
nf->qid = f->qid;
nf->user = strdup(f->user);
nf->c = f->c;
nf->wp = nf->buf;
nf->rp = nf->wp;
f = nf;
}
qid = f->qid;
err = nil;
nwname = r->f.nwname;
nqid = 0;
if(nwname > 0){
for(; err == nil && nqid < nwname; nqid++){
if(nqid >= MAXWELEM){
err = "too many name elements";
break;
}
name = r->f.wname[nqid];
if(strcmp(name, "..") == 0)
qid = parentqid(qid);
else if(strcmp(name, ".") != 0){
for(i = 0; ; i++){
n = fsdirgen(fs, qid, i, &d, nil, 0);
if(n < 0){
err = Eexist;
break;
}
if(n > 0 && strcmp(name, d.name) == 0){
qid = d.qid;
break;
}
}
}
wqid[nqid] = qid;
}
if(nf != nil && nqid < nwname)
fsputfid(fs, nf);
if(nqid == nwname)
f->qid = qid;
}
memmove(r->f.wqid, wqid, nqid*sizeof(Qid));
r->f.nwqid = nqid;
fsreply(fs, r, err);
}
int
ingroup(char *user, char *group)
{
Ndbtuple *t, *nt;
Ndbs s;
t = ndbsearch(db, &s, "group", group);
if(t == nil)
return 0;
for(nt = t; nt; nt = nt->entry){
if(strcmp(nt->attr, "uid") == 0)
if(strcmp(nt->val, user) == 0)
break;
}
ndbfree(t);
return nt != nil;
}
int
userok(char *u, char *cname)
{
Ndbtuple *t, *nt;
Ndbs s;
t = ndbsearch(db, &s, "console", cname);
if(t == nil)
return 0;
for(nt = t; nt; nt = nt->entry){
if(strcmp(nt->attr, "uid") == 0)
if(strcmp(nt->val, u) == 0)
break;
if(strcmp(nt->attr, "gid") == 0)
if(ingroup(u, nt->val))
break;
}
ndbfree(t);
return nt != nil;
}
int m2p[] ={
[OREAD] 4,
[OWRITE] 2,
[ORDWR] 6
};
/*
* broadcast a message to all listeners
*/
void
bcastmsg(Fs *fs, Console *c, char *msg, int n)
{
Fid *fl;
for(fl = c->flist; fl; fl = fl->cnext){
fromconsole(fl, msg, n);
fskick(fs, fl);
}
}
void
fsopen(Fs *fs, Request *r, Fid *f)
{
int mode;
Console *c;
if(f->attached == 0){
fsreply(fs, r, Enofid);
return;
}
if(f->open){
fsreply(fs, r, Eisopen);
return;
}
mode = r->f.mode & 3;
if((QTDIR & f->qid.type) && mode != OREAD){
fsreply(fs, r, Eperm);
return;
}
switch(TYPE(f->qid)){
case Qdata:
c = fs->cons[CONS(f->qid)];
if(!userok(f->user, c->name)){
fsreply(fs, r, Eperm);
return;
}
f->rp = f->buf;
f->wp = f->buf;
f->c = c;
lock(c);
sprint(f->mbuf, "[%s] ", f->user);
f->bufn = strlen(f->mbuf);
f->used = 0;
f->cnext = c->flist;
c->flist = f;
bcastmembers(fs, c, "+", f);
if(c->pid == 0)
fsreopen(fs, c);
unlock(c);
break;
case Qctl:
c = fs->cons[CONS(f->qid)];
if(!userok(f->user, c->name)){
fsreply(fs, r, Eperm);
return;
}
f->c = c;
break;
case Qstat:
c = fs->cons[CONS(f->qid)];
if(!userok(f->user, c->name)){
fsreply(fs, r, Eperm);
return;
}
f->c = c;
break;
}
f->open = 1;
r->f.iounit = messagesize-IOHDRSZ;
r->f.qid = f->qid;
fsreply(fs, r, nil);
}
void
fscreate(Fs *fs, Request *r, Fid*)
{
fsreply(fs, r, Eperm);
}
void
fsread(Fs *fs, Request *r, Fid *f)
{
uchar *p, *e;
int i, m, off;
vlong offset;
Dir d;
char sbuf[ERRMAX];
if(f->attached == 0){
fsreply(fs, r, Enofid);
return;
}
if((int)r->f.count < 0){
fsreply(fs, r, Ebadcount);
return;
}
if(QTDIR & f->qid.type){
p = r->buf + IOHDRSZ;
e = p + r->f.count;
offset = r->f.offset;
off = 0;
for(i=0; p<e; i++, off+=m){
m = fsdirgen(fs, f->qid, i, &d, p, e-p);
if(m < 0)
break;
if(m > BIT16SZ && off >= offset)
p += m;
}
r->f.data = (char*)r->buf + IOHDRSZ;
r->f.count = (char*)p - r->f.data;
} else {
switch(TYPE(f->qid)){
case Qdata:
addreq(&f->r, r);
fskick(fs, f);
return;
case Qctl:
r->f.data = (char*)r->buf+IOHDRSZ;
r->f.count = 0;
break;
case Qstat:
if(r->f.count > sizeof(sbuf))
r->f.count = sizeof(sbuf);
i = pread(f->c->sfd, sbuf, r->f.count, r->f.offset);
if(i < 0){
errstr(sbuf, sizeof sbuf);
fsreply(fs, r, sbuf);
return;
}
r->f.data = sbuf;
r->f.count = i;
break;
default:
fsreply(fs, r, Eexist);
return;
}
}
fsreply(fs, r, nil);
}
void
fswrite(Fs *fs, Request *r, Fid *f)
{
int i, eol = 0;
if(f->attached == 0){
fsreply(fs, r, Enofid);
return;
}
if((int)r->f.count < 0){
fsreply(fs, r, Ebadcount);
return;
}
if(QTDIR & f->qid.type){
fsreply(fs, r, Eperm);
return;
}
switch(TYPE(f->qid)){
default:
fsreply(fs, r, Eperm);
return;
case Qctl:
write(f->c->cfd, r->f.data, r->f.count);
break;
case Qdata:
for(i = 0; i < r->f.count; i++){
if(r->f.data[i] == '\n'){
if(f->c->chat && f->used)
eol = 1;
if(f->c->cronly)
r->f.data[i] = '\r';
}
else
f->used = 1;
}
if(f->c->chat){
fskick(fs, f);
if(!f->used)
break;
if(f->bufn + r->f.count > Bufsize){
r->f.count -= (f->bufn + r->f.count) % Bufsize;
eol = 1;
}
strncat(f->mbuf, r->f.data, r->f.count);
f->bufn += r->f.count;
if(eol){
bcastmsg(fs, f->c, f->mbuf, f->bufn);
sprint(f->mbuf, "[%s] ", f->user);
f->bufn = strlen(f->mbuf);
f->used = 0;
}
}
else
write(f->c->fd, r->f.data, r->f.count);
break;
}
fsreply(fs, r, nil);
}
void
fsclunk(Fs *fs, Request *r, Fid *f)
{
Fid **l, *fl;
Request *nr;
if(f->open && TYPE(f->qid) == Qdata){
while((nr = remreq(&f->r)) != nil){
fsputfid(fs, f);
free(nr);
}
lock(f->c);
for(l = &f->c->flist; *l; l = &fl->cnext){
fl = *l;
if(fl == f){
*l = fl->cnext;
break;
}
}
bcastmembers(fs, f->c, "-", f);
if(f->c->ondemand && f->c->flist == nil)
fsreopen(fs, f->c);
unlock(f->c);
}
fsreply(fs, r, nil);
fsputfid(fs, f);
}
void
fsremove(Fs *fs, Request *r, Fid*)
{
fsreply(fs, r, Eperm);
}
void
fsstat(Fs *fs, Request *r, Fid *f)
{
int i, n;
Qid q;
Dir d;
q = parentqid(f->qid);
for(i = 0; ; i++){
r->f.stat = r->buf+IOHDRSZ;
n = fsdirgen(fs, q, i, &d, r->f.stat, messagesize-IOHDRSZ);
if(n < 0){
fsreply(fs, r, Eexist);
return;
}
r->f.nstat = n;
if(r->f.nstat > BIT16SZ && d.qid.path == f->qid.path)
break;
}
fsreply(fs, r, nil);
}
void
fswstat(Fs *fs, Request *r, Fid*)
{
fsreply(fs, r, Eperm);
}
void
fsreply(Fs *fs, Request *r, char *err)
{
int n;
uchar buf[8192+IOHDRSZ];
if(err){
r->f.type = Rerror;
r->f.ename = err;
}
n = convS2M(&r->f, buf, messagesize);
if(debug)
fprint(2, "%F path %llux n=%d\n", &r->f, r->fid->qid.path, n);
fsputfid(fs, r->fid);
if(write(fs->fd, buf, n) != n)
fatal("unmounted");
free(r);
}
/*
* called whenever input or a read request has been received
*/
void
fskick(Fs *fs, Fid *f)
{
Request *r;
char *p, *rp, *wp, *ep;
int i;
lock(f);
while(f->rp != f->wp){
r = remreq(&f->r);
if(r == nil)
break;
p = (char*)r->buf;
rp = f->rp;
wp = f->wp;
ep = &f->buf[Bufsize];
for(i = 0; i < r->f.count && rp != wp; i++){
*p++ = *rp++;
if(rp >= ep)
rp = f->buf;
}
f->rp = rp;
r->f.data = (char*)r->buf;
r->f.count = p - (char*)r->buf;
fsreply(fs, r, nil);
}
unlock(f);
}
void
usage(void)
{
fprint(2, "usage: consolefs [-d] [-m mount-point] [-c console-db]\n");
threadexitsall("usage");
}
void
threadmain(int argc, char **argv)
{
rfork(RFNOTEG);
fmtinstall('F', fcallfmt);
ARGBEGIN{
case 'd':
debug++;
break;
case 'c':
consoledb = ARGF();
if(consoledb == nil)
usage();
break;
case 'm':
mntpt = ARGF();
if(mntpt == nil)
usage();
break;
}ARGEND;
db = ndbopen(consoledb);
if(db == nil)
fatal("can't open %s: %r", consoledb);
fsmount(mntpt);
}