ref: ff4daa7e93f4ea09506276ecdb69fa1cca19a7a7
dir: /sys/src/cmd/disk/kfs/9p1.c/
#include "all.h"
#include "9p1.h"
/*
* buggery to give false qid for
* the top 2 levels of the dump fs
*/
void
mkqid(Qid* qid, Dentry *d, int buggery)
{
int c;
if(buggery && d->qid.path == QPROOT && (d->qid.path & QPDIR)){
c = d->name[0];
if(c >= '0' && c <= '9'){
qid->path = 3;
qid->vers = d->qid.version;
qid->type = QTDIR;
c = (c-'0')*10 + (d->name[1]-'0');
if(c >= 1 && c <= 12)
qid->path = 4;
return;
}
}
mkqid9p2(qid, &d->qid, d->mode);
}
int
mkqidcmp(Qid* qid, Dentry *d)
{
Qid tmp;
mkqid(&tmp, d, 1);
if(qid->path==tmp.path && (qid->type&QTDIR)==(tmp.type&QTDIR))
return 0;
return Eqid;
}
void
f_nop(Chan *cp, Oldfcall *in, Oldfcall *ou)
{
USED(in);
USED(ou);
if(CHAT(cp))
print("c_nop %d\n", cp->chan);
}
void
f_flush(Chan *cp, Oldfcall *in, Oldfcall *ou)
{
USED(in);
USED(ou);
if(CHAT(cp))
print("c_flush %d\n", cp->chan);
runlock(&cp->reflock);
wlock(&cp->reflock);
wunlock(&cp->reflock);
rlock(&cp->reflock);
}
void
f_session(Chan *cp, Oldfcall *in, Oldfcall *ou)
{
if(CHAT(cp))
print("c_session %d\n", cp->chan);
memmove(cp->rchal, in->chal, sizeof(cp->rchal));
if(wstatallow || cp == cons.srvchan){
memset(ou->chal, 0, sizeof(ou->chal));
memset(ou->authid, 0, sizeof(ou->authid));
}else{
mkchallenge(cp);
memmove(ou->chal, cp->chal, sizeof(ou->chal));
memmove(ou->authid, nvr.authid, sizeof(ou->authid));
}
sprint(ou->authdom, "%s.%s", service, nvr.authdom);
fileinit(cp);
}
void
f_attach(Chan *cp, Oldfcall *in, Oldfcall *ou)
{
Iobuf *p;
Dentry *d;
File *f;
int u;
Filsys *fs;
long raddr;
if(CHAT(cp)) {
print("c_attach %d\n", cp->chan);
print(" fid = %d\n", in->fid);
print(" uid = %s\n", in->uname);
print(" arg = %s\n", in->aname);
}
ou->qid = QID9P1(0,0);
ou->fid = in->fid;
if(!in->aname[0]) /* default */
strncpy(in->aname, filesys[0].name, sizeof(in->aname));
p = 0;
f = filep(cp, in->fid, 1);
if(!f) {
ou->err = Efid;
goto out;
}
u = -1;
if(cp != cons.chan){
if(authorize(cp, in, ou) == 0 || strcmp(in->uname, "adm") == 0){
ou->err = Eauth;
goto out;
}
u = strtouid(in->uname);
if(u < 0){
ou->err = Ebadu;
goto out;
}
}
fs = fsstr(in->aname);
if(fs == 0) {
ou->err = Ebadspc;
goto out;
}
raddr = getraddr(fs->dev);
p = getbuf(fs->dev, raddr, Bread);
d = getdir(p, 0);
if(!d || checktag(p, Tdir, QPROOT) || !(d->mode & DALLOC)) {
ou->err = Ealloc;
goto out;
}
f->uid = u;
if(iaccess(f, d, DREAD)) {
ou->err = Eaccess;
goto out;
}
accessdir(p, d, FREAD);
mkqid(&f->qid, d, 1);
f->fs = fs;
f->addr = raddr;
f->slot = 0;
f->open = 0;
freewp(f->wpath);
f->wpath = 0;
mkqid9p1(&ou->qid, &f->qid);
out:
if(p)
putbuf(p);
if(f) {
qunlock(f);
if(ou->err)
freefp(f);
}
}
void
f_clone(Chan *cp, Oldfcall *in, Oldfcall *ou)
{
File *f1, *f2;
int fid, fid1;
if(CHAT(cp)) {
print("c_clone %d\n", cp->chan);
print(" old fid = %d\n", in->fid);
print(" new fid = %d\n", in->newfid);
}
fid = in->fid;
fid1 = in->newfid;
f1 = 0;
f2 = 0;
if(fid < fid1) {
f1 = filep(cp, fid, 0);
f2 = filep(cp, fid1, 1);
} else
if(fid1 < fid) {
f2 = filep(cp, fid1, 1);
f1 = filep(cp, fid, 0);
}
if(!f1 || !f2) {
ou->err = Efid;
goto out;
}
f2->fs = f1->fs;
f2->addr = f1->addr;
f2->open = f1->open & ~FREMOV;
f2->uid = f1->uid;
f2->slot = f1->slot;
f2->qid = f1->qid;
freewp(f2->wpath);
f2->wpath = getwp(f1->wpath);
out:
ou->fid = fid;
if(f1)
qunlock(f1);
if(f2)
qunlock(f2);
}
void
f_walk(Chan *cp, Oldfcall *in, Oldfcall *ou)
{
Iobuf *p, *p1;
Dentry *d, *d1;
File *f;
Wpath *w, *ow;
int slot;
long addr;
if(CHAT(cp)) {
print("c_walk %d\n", cp->chan);
print(" fid = %d\n", in->fid);
print(" name = %s\n", in->name);
}
ou->fid = in->fid;
ou->qid = QID9P1(0,0);
p = 0;
f = filep(cp, in->fid, 0);
if(!f) {
ou->err = Efid;
goto out;
}
p = getbuf(f->fs->dev, f->addr, Bread);
d = getdir(p, f->slot);
if(!d || checktag(p, Tdir, QPNONE) || !(d->mode & DALLOC)) {
ou->err = Ealloc;
goto out;
}
if(!(d->mode & DDIR)) {
ou->err = Edir1;
goto out;
}
if(ou->err = mkqidcmp(&f->qid, d))
goto out;
if(cp != cons.chan && iaccess(f, d, DEXEC)) {
ou->err = Eaccess;
goto out;
}
accessdir(p, d, FREAD);
if(strcmp(in->name, ".") == 0)
goto setdot;
if(strcmp(in->name, "..") == 0) {
if(f->wpath == 0)
goto setdot;
putbuf(p);
p = 0;
addr = f->wpath->addr;
slot = f->wpath->slot;
p1 = getbuf(f->fs->dev, addr, Bread);
d1 = getdir(p1, slot);
if(!d1 || checktag(p1, Tdir, QPNONE) || !(d1->mode & DALLOC)) {
if(p1)
putbuf(p1);
ou->err = Ephase;
goto out;
}
ow = f->wpath;
f->wpath = ow->up;
putwp(ow);
goto found;
}
for(addr=0;; addr++) {
p1 = dnodebuf(p, d, addr, 0);
if(!p1 || checktag(p1, Tdir, d->qid.path) ) {
if(p1)
putbuf(p1);
ou->err = Eentry;
goto out;
}
for(slot=0; slot<DIRPERBUF; slot++) {
d1 = getdir(p1, slot);
if(!(d1->mode & DALLOC))
continue;
if(strncmp(in->name, d1->name, sizeof(in->name)))
continue;
/*
* update walk path
*/
w = newwp();
if(!w) {
ou->err = Ewalk;
putbuf(p1);
goto out;
}
w->addr = f->addr;
w->slot = f->slot;
w->up = f->wpath;
f->wpath = w;
slot += DIRPERBUF*addr;
goto found;
}
putbuf(p1);
}
found:
f->addr = p1->addr;
mkqid(&f->qid, d1, 1);
putbuf(p1);
f->slot = slot;
setdot:
mkqid9p1(&ou->qid, &f->qid);
f->open = 0;
out:
if(p)
putbuf(p);
if(f)
qunlock(f);
}
void
f_clunk(Chan *cp, Oldfcall *in, Oldfcall *ou)
{
File *f;
Tlock *t;
long tim;
if(CHAT(cp)) {
print("c_clunk %d\n", cp->chan);
print(" fid = %d\n", in->fid);
}
f = filep(cp, in->fid, 0);
if(!f) {
print("%p\n", f);
ou->err = Efid;
goto out;
}
if(t = f->tlock) {
tim = time(0);
if(t->time < tim || t->file != f)
ou->err = Ebroken;
t->time = 0; /* free the lock */
f->tlock = 0;
}
if(f->open & FREMOV)
ou->err = doremove(f, 0);
f->open = 0;
freewp(f->wpath);
freefp(f);
out:
if(f)
qunlock(f);
ou->fid = in->fid;
}
void
f_clwalk(Chan *cp, Oldfcall *in, Oldfcall *ou)
{
int er, fid;
if(CHAT(cp))
print("c_clwalk macro\n");
f_clone(cp, in, ou); /* sets tag, fid */
if(ou->err)
return;
fid = in->fid;
in->fid = in->newfid;
f_walk(cp, in, ou); /* sets tag, fid, qid */
er = ou->err;
if(er == Eentry) {
/*
* if error is "no entry"
* return non error and fid
*/
ou->err = 0;
f_clunk(cp, in, ou); /* sets tag, fid */
ou->err = 0;
ou->fid = fid;
if(CHAT(cp))
print(" error: %s\n", errstring[er]);
return;
}
if(er) {
/*
* if any other error
* return an error
*/
ou->err = 0;
f_clunk(cp, in, ou); /* sets tag, fid */
ou->err = er;
return;
}
/*
* non error
* return newfid
*/
}
void
f_open(Chan *cp, Oldfcall *in, Oldfcall *ou)
{
Iobuf *p;
Dentry *d;
File *f;
Tlock *t;
Qid qid;
int ro, fmod;
if(CHAT(cp)) {
print("c_open %d\n", cp->chan);
print(" fid = %d\n", in->fid);
print(" mode = %o\n", in->mode);
}
p = 0;
f = filep(cp, in->fid, 0);
if(!f) {
ou->err = Efid;
goto out;
}
/*
* if remove on close, check access here
*/
ro = isro(f->fs->dev) || (cp != cons.chan && writegroup && !ingroup(f->uid, writegroup));
if(in->mode & MRCLOSE) {
if(ro) {
ou->err = Eronly;
goto out;
}
/*
* check on parent directory of file to be deleted
*/
if(f->wpath == 0 || f->wpath->addr == f->addr) {
ou->err = Ephase;
goto out;
}
p = getbuf(f->fs->dev, f->wpath->addr, Bread);
d = getdir(p, f->wpath->slot);
if(!d || checktag(p, Tdir, QPNONE) || !(d->mode & DALLOC)) {
ou->err = Ephase;
goto out;
}
if(iaccess(f, d, DWRITE)) {
ou->err = Eaccess;
goto out;
}
putbuf(p);
}
p = getbuf(f->fs->dev, f->addr, Bread);
d = getdir(p, f->slot);
if(!d || checktag(p, Tdir, QPNONE) || !(d->mode & DALLOC)) {
ou->err = Ealloc;
goto out;
}
if(ou->err = mkqidcmp(&f->qid, d))
goto out;
mkqid(&qid, d, 1);
switch(in->mode & 7) {
case MREAD:
if(iaccess(f, d, DREAD) && !writeallow)
goto badaccess;
fmod = FREAD;
break;
case MWRITE:
if((d->mode & DDIR) ||
(iaccess(f, d, DWRITE) && !writeallow))
goto badaccess;
if(ro) {
ou->err = Eronly;
goto out;
}
fmod = FWRITE;
break;
case MBOTH:
if((d->mode & DDIR) ||
(iaccess(f, d, DREAD) && !writeallow) ||
(iaccess(f, d, DWRITE) && !writeallow))
goto badaccess;
if(ro) {
ou->err = Eronly;
goto out;
}
fmod = FREAD+FWRITE;
break;
case MEXEC:
if((d->mode & DDIR) ||
iaccess(f, d, DEXEC))
goto badaccess;
fmod = FREAD;
break;
default:
ou->err = Emode;
goto out;
}
if(in->mode & MTRUNC) {
if((d->mode & DDIR) ||
(iaccess(f, d, DWRITE) && !writeallow))
goto badaccess;
if(ro) {
ou->err = Eronly;
goto out;
}
}
t = 0;
if(d->mode & DLOCK) {
t = tlocked(p, d);
if(t == 0) {
ou->err = Elocked;
goto out;
}
t->file = f;
}
if(in->mode & MRCLOSE)
fmod |= FREMOV;
f->open = fmod;
if(in->mode & MTRUNC)
if(!(d->mode & DAPND))
dtrunc(p, d);
f->tlock = t;
f->lastra = 0;
mkqid9p1(&ou->qid, &qid);
goto out;
badaccess:
ou->err = Eaccess;
f->open = 0;
out:
if(p)
putbuf(p);
if(f)
qunlock(f);
ou->fid = in->fid;
}
void
f_create(Chan *cp, Oldfcall *in, Oldfcall *ou)
{
Iobuf *p, *p1;
Dentry *d, *d1;
File *f;
int slot, slot1, fmod;
long addr, addr1, path;
Qid qid;
Tlock *t;
Wpath *w;
if(CHAT(cp)) {
print("c_create %d\n", cp->chan);
print(" fid = %d\n", in->fid);
print(" name = %s\n", in->name);
print(" perm = %lx+%lo\n", (in->perm>>28)&0xf,
in->perm&0777);
print(" mode = %d\n", in->mode);
}
p = 0;
f = filep(cp, in->fid, 0);
if(!f) {
ou->err = Efid;
goto out;
}
if(isro(f->fs->dev) || (cp != cons.chan && writegroup && !ingroup(f->uid, writegroup))) {
ou->err = Eronly;
goto out;
}
p = getbuf(f->fs->dev, f->addr, Bread);
d = getdir(p, f->slot);
if(!d || checktag(p, Tdir, QPNONE) || !(d->mode & DALLOC)) {
ou->err = Ealloc;
goto out;
}
if(ou->err = mkqidcmp(&f->qid, d))
goto out;
if(!(d->mode & DDIR)) {
ou->err = Edir2;
goto out;
}
if(cp != cons.chan && iaccess(f, d, DWRITE) && !writeallow) {
ou->err = Eaccess;
goto out;
}
accessdir(p, d, FREAD);
if(!strncmp(in->name, ".", sizeof(in->name)) ||
!strncmp(in->name, "..", sizeof(in->name))) {
ou->err = Edot;
goto out;
}
if(checkname(in->name)) {
ou->err = Ename;
goto out;
}
addr1 = 0;
slot1 = 0; /* set */
for(addr=0;; addr++) {
p1 = dnodebuf(p, d, addr, 0);
if(!p1) {
if(addr1)
break;
p1 = dnodebuf(p, d, addr, Tdir);
}
if(p1 == 0) {
ou->err = Efull;
goto out;
}
if(checktag(p1, Tdir, d->qid.path)) {
putbuf(p1);
goto phase;
}
for(slot=0; slot<DIRPERBUF; slot++) {
d1 = getdir(p1, slot);
if(!(d1->mode & DALLOC)) {
if(!addr1) {
addr1 = p1->addr;
slot1 = slot + addr*DIRPERBUF;
}
continue;
}
if(!strncmp(in->name, d1->name, sizeof(in->name))) {
putbuf(p1);
ou->err = Eexist;
goto out;
}
}
putbuf(p1);
}
switch(in->mode & 7) {
case MEXEC:
case MREAD: /* seems only useful to make directories */
fmod = FREAD;
break;
case MWRITE:
fmod = FWRITE;
break;
case MBOTH:
fmod = FREAD+FWRITE;
break;
default:
ou->err = Emode;
goto out;
}
if(in->perm & PDIR)
if((in->mode & MTRUNC) || (in->perm & PAPND) || (fmod & FWRITE))
goto badaccess;
/*
* do it
*/
path = qidpathgen(&f->fs->dev);
p1 = getbuf(f->fs->dev, addr1, Bread|Bimm|Bmod);
d1 = getdir(p1, slot1);
if(!d1 || checktag(p1, Tdir, d->qid.path)) {
if(p1)
putbuf(p1);
goto phase;
}
if(d1->mode & DALLOC) {
putbuf(p1);
goto phase;
}
strncpy(d1->name, in->name, sizeof(in->name));
/*
* bogus argument passing -- see console.c
*/
if(cp == cons.chan) {
d1->uid = cons.uid;
d1->gid = cons.gid;
} else {
d1->uid = f->uid;
d1->gid = d->gid;
in->perm &= d->mode | ~0666;
if(in->perm & PDIR)
in->perm &= d->mode | ~0777;
}
d1->qid.path = path;
d1->qid.version = 0;
d1->mode = DALLOC | (in->perm & 0777);
if(in->perm & PDIR) {
d1->mode |= DDIR;
d1->qid.path |= QPDIR;
}
if(in->perm & PAPND)
d1->mode |= DAPND;
t = 0;
if(in->perm & PLOCK) {
d1->mode |= DLOCK;
t = tlocked(p1, d1);
}
accessdir(p1, d1, FWRITE);
mkqid(&qid, d1, 0);
putbuf(p1);
accessdir(p, d, FWRITE);
/*
* do a walk to new directory entry
*/
w = newwp();
if(!w) {
ou->err = Ewalk;
goto out;
}
w->addr = f->addr;
w->slot = f->slot;
w->up = f->wpath;
f->wpath = w;
f->qid = qid;
f->tlock = t;
f->lastra = 0;
if(in->mode & MRCLOSE)
fmod |= FREMOV;
f->open = fmod;
f->addr = addr1;
f->slot = slot1;
if(t)
t->file = f;
mkqid9p1(&ou->qid, &qid);
goto out;
badaccess:
ou->err = Eaccess;
goto out;
phase:
ou->err = Ephase;
out:
if(p)
putbuf(p);
if(f)
qunlock(f);
ou->fid = in->fid;
}
void
f_read(Chan *cp, Oldfcall *in, Oldfcall *ou)
{
Iobuf *p, *p1;
File *f;
Dentry *d, *d1;
Tlock *t;
long addr, offset, tim;
int nread, count, n, o, slot;
if(CHAT(cp)) {
print("c_read %d\n", cp->chan);
print(" fid = %d\n", in->fid);
print(" offset = %ld\n", in->offset);
print(" count = %ld\n", in->count);
}
p = 0;
count = in->count;
offset = in->offset;
nread = 0;
f = filep(cp, in->fid, 0);
if(!f) {
ou->err = Efid;
goto out;
}
if(!(f->open & FREAD)) {
ou->err = Eopen;
goto out;
}
if(count < 0 || count > MAXDAT) {
ou->err = Ecount;
goto out;
}
if(offset < 0) {
ou->err = Eoffset;
goto out;
}
p = getbuf(f->fs->dev, f->addr, Bread);
d = getdir(p, f->slot);
if(!d || !(d->mode & DALLOC)) {
ou->err = Ealloc;
goto out;
}
if(ou->err = mkqidcmp(&f->qid, d))
goto out;
if(t = f->tlock) {
tim = time(0);
if(t->time < tim || t->file != f) {
ou->err = Ebroken;
goto out;
}
/* renew the lock */
t->time = tim + TLOCK;
}
accessdir(p, d, FREAD);
if(d->mode & DDIR) {
addr = 0;
goto dread;
}
if(offset >= d->size)
count = 0;
else if(offset+count > d->size)
count = d->size - offset;
while(count > 0) {
addr = offset / BUFSIZE;
if(addr == f->lastra+1)
dbufread(p, d, addr+1);
f->lastra = addr;
o = offset % BUFSIZE;
n = BUFSIZE - o;
if(n > count)
n = count;
p1 = dnodebuf(p, d, addr, 0);
if(p1) {
if(checktag(p1, Tfile, QPNONE)) {
ou->err = Ephase;
putbuf(p1);
goto out;
}
memmove(ou->data+nread, p1->iobuf+o, n);
putbuf(p1);
} else
memset(ou->data+nread, 0, n);
count -= n;
nread += n;
offset += n;
}
goto out;
dread:
p1 = dnodebuf(p, d, addr, 0);
if(!p1)
goto out;
if(checktag(p1, Tdir, QPNONE)) {
ou->err = Ephase;
putbuf(p1);
goto out;
}
n = DIRREC;
for(slot=0; slot<DIRPERBUF; slot++) {
d1 = getdir(p1, slot);
if(!(d1->mode & DALLOC))
continue;
if(offset >= n) {
offset -= n;
continue;
}
if(count < n) {
putbuf(p1);
goto out;
}
if(convD2M9p1(d1, ou->data+nread) != n)
print("dirread convD2M\n");
nread += n;
count -= n;
}
putbuf(p1);
addr++;
goto dread;
out:
count = in->count - nread;
if(count > 0)
memset(ou->data+nread, 0, count);
if(p)
putbuf(p);
if(f)
qunlock(f);
ou->fid = in->fid;
ou->count = nread;
if(CHAT(cp))
print(" nread = %d\n", nread);
}
void
f_write(Chan *cp, Oldfcall *in, Oldfcall *ou)
{
Iobuf *p, *p1;
Dentry *d;
File *f;
Tlock *t;
long offset, addr, tim;
int count, nwrite, o, n;
if(CHAT(cp)) {
print("c_write %d\n", cp->chan);
print(" fid = %d\n", in->fid);
print(" offset = %ld\n", in->offset);
print(" count = %ld\n", in->count);
}
offset = in->offset;
count = in->count;
nwrite = 0;
p = 0;
f = filep(cp, in->fid, 0);
if(!f) {
ou->err = Efid;
goto out;
}
if(!(f->open & FWRITE)) {
ou->err = Eopen;
goto out;
}
if(isro(f->fs->dev) || (cp != cons.chan && writegroup && !ingroup(f->uid, writegroup))) {
ou->err = Eronly;
goto out;
}
if(count < 0 || count > MAXDAT) {
ou->err = Ecount;
goto out;
}
if(offset < 0) {
ou->err = Eoffset;
goto out;
}
p = getbuf(f->fs->dev, f->addr, Bread|Bmod);
d = getdir(p, f->slot);
if(!d || !(d->mode & DALLOC)) {
ou->err = Ealloc;
goto out;
}
if(ou->err = mkqidcmp(&f->qid, d))
goto out;
if(t = f->tlock) {
tim = time(0);
if(t->time < tim || t->file != f) {
ou->err = Ebroken;
goto out;
}
/* renew the lock */
t->time = tim + TLOCK;
}
accessdir(p, d, FWRITE);
if(d->mode & DAPND)
offset = d->size;
if(offset+count > d->size)
d->size = offset+count;
while(count > 0) {
addr = offset / BUFSIZE;
o = offset % BUFSIZE;
n = BUFSIZE - o;
if(n > count)
n = count;
p1 = dnodebuf(p, d, addr, Tfile);
if(p1 == 0) {
ou->err = Efull;
goto out;
}
if(checktag(p1, Tfile, d->qid.path)) {
putbuf(p1);
ou->err = Ephase;
goto out;
}
memmove(p1->iobuf+o, in->data+nwrite, n);
p1->flags |= Bmod;
putbuf(p1);
count -= n;
nwrite += n;
offset += n;
}
if(CHAT(cp))
print(" nwrite = %d\n", nwrite);
out:
if(p)
putbuf(p);
if(f)
qunlock(f);
ou->fid = in->fid;
ou->count = nwrite;
}
int
doremove(File *f, int iscon)
{
Iobuf *p, *p1;
Dentry *d, *d1;
long addr;
int slot, err;
p = 0;
p1 = 0;
if(isro(f->fs->dev) || (f->cp != cons.chan && writegroup && !ingroup(f->uid, writegroup))) {
err = Eronly;
goto out;
}
/*
* check on parent directory of file to be deleted
*/
if(f->wpath == 0 || f->wpath->addr == f->addr) {
err = Ephase;
goto out;
}
p1 = getbuf(f->fs->dev, f->wpath->addr, Bread);
d1 = getdir(p1, f->wpath->slot);
if(!d1 || checktag(p1, Tdir, QPNONE) || !(d1->mode & DALLOC)) {
err = Ephase;
goto out;
}
if(!iscon && iaccess(f, d1, DWRITE)) {
err = Eaccess;
goto out;
}
accessdir(p1, d1, FWRITE);
putbuf(p1);
p1 = 0;
/*
* check on file to be deleted
*/
p = getbuf(f->fs->dev, f->addr, Bread);
d = getdir(p, f->slot);
if(!d || checktag(p, Tdir, QPNONE) || !(d->mode & DALLOC)) {
err = Ealloc;
goto out;
}
if(err = mkqidcmp(&f->qid, d))
goto out;
/*
* if deleting a directory, make sure it is empty
*/
if((d->mode & DDIR))
for(addr=0;; addr++) {
p1 = dnodebuf(p, d, addr, 0);
if(!p1)
break;
if(checktag(p1, Tdir, d->qid.path)) {
err = Ephase;
goto out;
}
for(slot=0; slot<DIRPERBUF; slot++) {
d1 = getdir(p1, slot);
if(!(d1->mode & DALLOC))
continue;
err = Eempty;
goto out;
}
putbuf(p1);
}
/*
* do it
*/
dtrunc(p, d);
memset(d, 0, sizeof(Dentry));
settag(p, Tdir, QPNONE);
out:
if(p1)
putbuf(p1);
if(p)
putbuf(p);
return err;
}
void
f_remove(Chan *cp, Oldfcall *in, Oldfcall *ou)
{
File *f;
if(CHAT(cp)) {
print("c_remove %d\n", cp->chan);
print(" fid = %d\n", in->fid);
}
f = filep(cp, in->fid, 0);
if(!f) {
ou->err = Efid;
goto out;
}
ou->err = doremove(f, cp==cons.chan);
out:
ou->fid = in->fid;
if(f)
qunlock(f);
}
void
f_stat(Chan *cp, Oldfcall *in, Oldfcall *ou)
{
Iobuf *p;
Dentry *d;
File *f;
if(CHAT(cp)) {
print("c_stat %d\n", cp->chan);
print(" fid = %d\n", in->fid);
}
p = 0;
memset(ou->stat, 0, sizeof(ou->stat));
f = filep(cp, in->fid, 0);
if(!f) {
ou->err = Efid;
goto out;
}
p = getbuf(f->fs->dev, f->addr, Bread);
d = getdir(p, f->slot);
if(!d || checktag(p, Tdir, QPNONE) || !(d->mode & DALLOC)) {
ou->err = Ealloc;
goto out;
}
if(ou->err = mkqidcmp(&f->qid, d))
goto out;
if(d->qid.path == QPROOT) /* stat of root gives time */
d->atime = time(0);
if(convD2M9p1(d, ou->stat) != DIRREC)
print("stat convD2M\n");
out:
if(p)
putbuf(p);
if(f)
qunlock(f);
ou->fid = in->fid;
}
void
f_wstat(Chan *cp, Oldfcall *in, Oldfcall *ou)
{
Iobuf *p, *p1;
Dentry *d, *d1, xd;
File *f;
int slot;
long addr;
if(CHAT(cp)) {
print("c_wstat %d\n", cp->chan);
print(" fid = %d\n", in->fid);
}
p = 0;
p1 = 0;
d1 = 0;
f = filep(cp, in->fid, 0);
if(!f) {
ou->err = Efid;
goto out;
}
if(isro(f->fs->dev) || (cp != cons.chan && writegroup && !ingroup(f->uid, writegroup))) {
ou->err = Eronly;
goto out;
}
/*
* first get parent
*/
if(f->wpath) {
p1 = getbuf(f->fs->dev, f->wpath->addr, Bread);
d1 = getdir(p1, f->wpath->slot);
if(!d1 || checktag(p1, Tdir, QPNONE) || !(d1->mode & DALLOC)) {
ou->err = Ephase;
goto out;
}
}
p = getbuf(f->fs->dev, f->addr, Bread);
d = getdir(p, f->slot);
if(!d || checktag(p, Tdir, QPNONE) || !(d->mode & DALLOC)) {
ou->err = Ealloc;
goto out;
}
if(ou->err = mkqidcmp(&f->qid, d))
goto out;
convM2D9p1(in->stat, &xd);
if(CHAT(cp)) {
print(" d.name = %s\n", xd.name);
print(" d.uid = %d\n", xd.uid);
print(" d.gid = %d\n", xd.gid);
print(" d.mode = %.4x\n", xd.mode);
}
/*
* if chown,
* must be god
*/
while(xd.uid != d->uid) {
if(wstatallow) /* set to allow chown during boot */
break;
ou->err = Enotu;
goto out;
}
/*
* if chgroup,
* must be either
* a) owner and in new group
* b) leader of both groups
*/
while(xd.gid != d->gid) {
if(wstatallow || writeallow) /* set to allow chgrp during boot */
break;
if(d->uid == f->uid && ingroup(f->uid, xd.gid))
break;
if(leadgroup(f->uid, xd.gid))
if(leadgroup(f->uid, d->gid))
break;
ou->err = Enotg;
goto out;
}
/*
* if rename,
* must have write permission in parent
*/
if(xd.name[0] == 0)
strncpy(xd.name, d->name, sizeof(xd.name));
while(strncmp(d->name, xd.name, sizeof(d->name)) != 0) {
if(checkname(xd.name)) {
ou->err = Ename;
goto out;
}
if(strcmp(xd.name, ".") == 0 || strcmp(xd.name, "..") == 0) {
ou->err = Ename;
goto out;
}
/*
* drop entry to prevent lock, then
* check that destination name is unique,
*/
putbuf(p);
for(addr=0;; addr++) {
p = dnodebuf(p1, d1, addr, 0);
if(!p)
break;
if(checktag(p, Tdir, d1->qid.path)) {
putbuf(p);
continue;
}
for(slot=0; slot<DIRPERBUF; slot++) {
d = getdir(p, slot);
if(!(d->mode & DALLOC))
continue;
if(!strncmp(xd.name, d->name, sizeof(xd.name))) {
ou->err = Eexist;
goto out;
}
}
putbuf(p);
}
/*
* reacquire entry
*/
p = getbuf(f->fs->dev, f->addr, Bread);
d = getdir(p, f->slot);
if(!d || checktag(p, Tdir, QPNONE) || !(d->mode & DALLOC)) {
ou->err = Ephase;
goto out;
}
if(wstatallow || writeallow) /* set to allow rename during boot */
break;
if(!d1 || iaccess(f, d1, DWRITE)) {
ou->err = Eaccess;
goto out;
}
break;
}
/*
* if mode/time, either
* a) owner
* b) leader of either group
*/
while(d->mtime != xd.mtime ||
((d->mode^xd.mode) & (DAPND|DLOCK|0777))) {
if(wstatallow) /* set to allow chmod during boot */
break;
if(d->uid == f->uid)
break;
if(leadgroup(f->uid, xd.gid))
break;
if(leadgroup(f->uid, d->gid))
break;
ou->err = Enotu;
goto out;
}
d->mtime = xd.mtime;
d->uid = xd.uid;
d->gid = xd.gid;
d->mode = (xd.mode & (DAPND|DLOCK|0777)) | (d->mode & (DALLOC|DDIR));
strncpy(d->name, xd.name, sizeof(d->name));
if(wstatallow) {
p->flags |= Bmod;
if(xd.atime)
d->atime = xd.atime;
if(xd.mtime)
d->mtime = xd.mtime;
} else
accessdir(p, d, FWSTAT);
out:
if(p)
putbuf(p);
if(p1)
putbuf(p1);
if(f)
qunlock(f);
ou->fid = in->fid;
}
void
(*call9p1[MAXSYSCALL])(Chan*, Oldfcall*, Oldfcall*) =
{
[Tnop9p1] f_nop,
[Tosession9p1] f_session,
[Tsession9p1] f_session,
[Tflush9p1] f_flush,
[Toattach9p1] f_attach,
[Tattach9p1] f_attach,
[Tclone9p1] f_clone,
[Twalk9p1] f_walk,
[Topen9p1] f_open,
[Tcreate9p1] f_create,
[Tread9p1] f_read,
[Twrite9p1] f_write,
[Tclunk9p1] f_clunk,
[Tremove9p1] f_remove,
[Tstat9p1] f_stat,
[Twstat9p1] f_wstat,
[Tclwalk9p1] f_clwalk,
};
static void
send(Chan *c, uchar *buf, int n)
{
int fd, m;
fd = c->chan;
m = write(fd, buf, n);
if(m == n)
return;
panic("write failed");
}
void
error9p1(Chan *c, uchar *buf)
{
buf[0] = Rnop9p1;
buf[1] = ~0;
buf[2] = ~0;
send(c, buf, 3);
}
void
serve9p1(Chan *chan, uchar *ib, int nib)
{
int n, t;
uchar inbuf[MAXMSG+MAXDAT], outbuf[MAXMSG+MAXDAT];
Oldfcall fi, fo;
for(;;){
if(nib){
memmove(inbuf, ib, nib);
n = nib;
nib = 0;
}else
n = read(chan->chan, inbuf, sizeof inbuf);
if(chat)
print("read msg %d\n", n);
if(n == 0 && (chan == cons.srvchan || chan == cons.chan))
continue;
if(n <= 0)
return;
if(convM2S9p1(inbuf, &fi, n) != n){
error9p1(chan, outbuf);
continue;
}
t = fi.type;
if(t < 0 || t >= MAXSYSCALL || (t&1) || !call9p1[t]) {
print("9p1: bad message type\n");
error9p1(chan, outbuf);
continue;
}
if(CHAT(chan))
print("9p1: fi %O\n", &fi);
/*
* set up reply message
*/
fo.err = 0;
if(t == Tread9p1)
fo.data = (char*)outbuf + 8;
/*
* call the file system
*/
cons.work.count++;
cons.rate.count += n;
/*
* call the file system
*/
rlock(&mainlock);
rlock(&chan->reflock);
(*call9p1[t])(chan, &fi, &fo);
runlock(&chan->reflock);
runlock(&mainlock);
fo.type = t+1;
fo.tag = fi.tag;
if(chat)
print("9p1: fo %O\n", &fo);
if(fo.err) {
strcpy(fo.ename, errstring[fo.err]);
if(CHAT(cp))
print(" error: %s\n", fo.ename);
fo.type = Terror9p1+1;
}
n = convS2M9p1(&fo, outbuf);
if(n == 0) {
print("9p1: bad S2M conversion\n");
error9p1(chan, outbuf);
continue;
}
cons.rate.count += n;
send(chan, outbuf, n);
}
}