ref: a79465e118a0469bbda928f86b9eef6b42d18593
dir: /sys/src/cmd/cfs/cfs.c/
#include <u.h>
#include <libc.h>
#include <auth.h>
#include <fcall.h>
#include "cformat.h"
#include "lru.h"
#include "bcache.h"
#include "disk.h"
#include "inode.h"
#include "file.h"
#include "stats.h"
enum
{
Nfid= 10240,
};
/* maximum length of a file */
enum { MAXLEN = ~0ULL >> 1 };
typedef struct Mfile Mfile;
typedef struct Ram Ram;
typedef struct P9fs P9fs;
struct Mfile
{
Qid qid;
char busy;
};
Mfile mfile[Nfid];
Icache ic;
int debug, statson, noauth, openserver;
struct P9fs
{
int fd[2];
Fcall rhdr;
Fcall thdr;
long len;
char *name;
};
P9fs c; /* client conversation */
P9fs s; /* server conversation */
struct Cfsstat cfsstat, cfsprev;
char statbuf[2048];
int statlen;
#define MAXFDATA IOUNIT /* i/o size for read/write */
int messagesize = MAXFDATA+IOHDRSZ;
uchar datasnd[MAXFDATA + IOHDRSZ];
uchar datarcv[MAXFDATA + IOHDRSZ];
Qid rootqid;
Qid ctlqid = {0x5555555555555555LL, 0, 0};
void rversion(void);
void rauth(Mfile*);
void rflush(void);
void rattach(Mfile*);
void rwalk(Mfile*);
void ropen(Mfile*);
void rcreate(Mfile*);
void rread(Mfile*);
void rwrite(Mfile*);
void rclunk(Mfile*);
void rremove(Mfile*);
void rstat(Mfile*);
void rwstat(Mfile*);
void error(char*, ...);
void warning(char*);
void mountinit(char*, char*);
void io(void);
void sendreply(char*);
void sendmsg(P9fs*, Fcall*);
void rcvmsg(P9fs*, Fcall*);
int delegate(void);
int askserver(void);
void cachesetup(int, char*, char*);
int ctltest(Mfile*);
void genstats(void);
char *mname[]={
[Tversion] "Tversion",
[Tauth] "Tauth",
[Tflush] "Tflush",
[Tattach] "Tattach",
[Twalk] "Twalk",
[Topen] "Topen",
[Tcreate] "Tcreate",
[Tclunk] "Tclunk",
[Tread] "Tread",
[Twrite] "Twrite",
[Tremove] "Tremove",
[Tstat] "Tstat",
[Twstat] "Twstat",
[Rversion] "Rversion",
[Rauth] "Rauth",
[Rerror] "Rerror",
[Rflush] "Rflush",
[Rattach] "Rattach",
[Rwalk] "Rwalk",
[Ropen] "Ropen",
[Rcreate] "Rcreate",
[Rclunk] "Rclunk",
[Rread] "Rread",
[Rwrite] "Rwrite",
[Rremove] "Rremove",
[Rstat] "Rstat",
[Rwstat] "Rwstat",
0,
};
void
usage(void)
{
fprint(2, "usage:\tcfs -s [-dknrS] [-f partition]\n");
fprint(2, "\tcfs [-a netaddr | -F srv] [-dknrS] [-f partition] [mntpt]\n");
exits("usage");
}
void
main(int argc, char *argv[])
{
int std, format, chkid;
char *part, *server, *mtpt;
NetConnInfo *snci;
std = 0;
format = 0;
chkid = 1;
part = "/dev/sdC0/cache";
server = "tcp!fs";
mtpt = "/mnt/cfs";
ARGBEGIN{
case 'a':
server = EARGF(usage());
break;
case 'd':
debug = 1;
break;
case 'f':
part = EARGF(usage());
break;
case 'F':
server = EARGF(usage());
openserver = 1;
break;
case 'k':
chkid = 0;
break;
case 'n':
noauth = 1;
break;
case 'r':
format = 1;
break;
case 'S':
statson = 1;
break;
case 's':
std = 1;
break;
default:
usage();
}ARGEND
if(argc && *argv)
mtpt = *argv;
if(debug)
fmtinstall('F', fcallfmt);
c.name = "client";
s.name = "server";
if(std){
c.fd[0] = c.fd[1] = 1;
s.fd[0] = s.fd[1] = 0;
}else
mountinit(server, mtpt);
if(chkid){
if((snci = getnetconninfo(nil, s.fd[0])) == nil)
/* Failed to lookup information; format */
cachesetup(1, nil, part);
else
/* Do partition check */
cachesetup(0, snci->raddr, part);
}else
/* Obey -f w/o regard to cache vs. remote server */
cachesetup(format, nil, part);
switch(fork()){
case 0:
io();
exits("");
case -1:
error("fork");
default:
exits("");
}
}
void
cachesetup(int format, char *name, char *partition)
{
int f;
int secsize;
int inodes;
int blocksize;
secsize = 512;
inodes = 1024;
blocksize = 4*1024;
f = open(partition, ORDWR);
if(f < 0)
error("opening partition");
if(format || iinit(&ic, f, secsize, name) < 0){
/*
* If we need to format and don't have a name, fall
* back to our old behavior of using "bootes"
*/
name = (name == nil? "bootes": name);
if(iformat(&ic, f, inodes, name, blocksize, secsize) < 0)
error("formatting failed");
}
}
void
mountinit(char *server, char *mountpoint)
{
int err;
int p[2];
/*
* grab a channel and call up the file server
*/
if (openserver)
s.fd[0] = open(server, ORDWR);
else
s.fd[0] = dial(netmkaddr(server, 0, "9fs"), 0, 0, 0);
if(s.fd[0] < 0)
error("opening data: %r");
s.fd[1] = s.fd[0];
/*
* mount onto name space
*/
if(pipe(p) < 0)
error("pipe failed");
switch(fork()){
case 0:
close(p[1]);
break;
default:
if (noauth)
err = mount(p[1], -1, mountpoint, MREPL|MCREATE, "");
else
err = amount(p[1], mountpoint, MREPL|MCREATE, "");
if (err == -1)
error("mount failed: %r");
exits(0);
case -1:
error("fork failed\n");
/*BUG: no wait!*/
}
c.fd[0] = c.fd[1] = p[0];
}
void
io(void)
{
int type;
Mfile *mf;
loop:
rcvmsg(&c, &c.thdr);
type = c.thdr.type;
if(statson){
cfsstat.cm[type].n++;
cfsstat.cm[type].s = nsec();
}
mf = &mfile[c.thdr.fid];
switch(type){
default:
error("type");
break;
case Tversion:
rversion();
break;
case Tauth:
mf = &mfile[c.thdr.afid];
rauth(mf);
break;
case Tflush:
rflush();
break;
case Tattach:
rattach(mf);
break;
case Twalk:
rwalk(mf);
break;
case Topen:
ropen(mf);
break;
case Tcreate:
rcreate(mf);
break;
case Tread:
rread(mf);
break;
case Twrite:
rwrite(mf);
break;
case Tclunk:
rclunk(mf);
break;
case Tremove:
rremove(mf);
break;
case Tstat:
rstat(mf);
break;
case Twstat:
rwstat(mf);
break;
}
if(statson){
cfsstat.cm[type].t += nsec() -cfsstat.cm[type].s;
}
goto loop;
}
void
rversion(void)
{
if(messagesize > c.thdr.msize)
messagesize = c.thdr.msize;
c.thdr.msize = messagesize; /* set downstream size */
delegate();
}
void
rauth(Mfile *mf)
{
if(mf->busy)
error("auth to used channel");
if(delegate() == 0){
mf->qid = s.rhdr.aqid;
mf->busy = 1;
}
}
void
rflush(void) /* synchronous so easy */
{
sendreply(0);
}
void
rattach(Mfile *mf)
{
if(delegate() == 0){
mf->qid = s.rhdr.qid;
mf->busy = 1;
if (statson == 1){
statson++;
rootqid = mf->qid;
}
}
}
void
rwalk(Mfile *mf)
{
Mfile *nmf;
nmf = nil;
if(statson
&& mf->qid.type == rootqid.type && mf->qid.path == rootqid.path
&& c.thdr.nwname == 1 && strcmp(c.thdr.wname[0], "cfsctl") == 0){
/* This is the ctl file */
nmf = &mfile[c.thdr.newfid];
if(c.thdr.newfid != c.thdr.fid && nmf->busy)
error("clone to used channel");
nmf = &mfile[c.thdr.newfid];
nmf->qid = ctlqid;
nmf->busy = 1;
c.rhdr.nwqid = 1;
c.rhdr.wqid[0] = ctlqid;
sendreply(0);
return;
}
if(c.thdr.newfid != c.thdr.fid){
if(c.thdr.newfid >= Nfid)
error("clone nfid out of range");
nmf = &mfile[c.thdr.newfid];
if(nmf->busy)
error("clone to used channel");
nmf = &mfile[c.thdr.newfid];
nmf->qid = mf->qid;
nmf->busy = 1;
mf = nmf; /* Walk mf */
}
if(delegate() < 0){ /* complete failure */
if(nmf)
nmf->busy = 0;
return;
}
if(s.rhdr.nwqid == c.thdr.nwname){ /* complete success */
if(s.rhdr.nwqid > 0)
mf->qid = s.rhdr.wqid[s.rhdr.nwqid-1];
return;
}
/* partial success; release fid */
if(nmf)
nmf->busy = 0;
}
void
ropen(Mfile *mf)
{
if(statson && ctltest(mf)){
/* Opening ctl file */
if(c.thdr.mode != OREAD){
sendreply("does not exist");
return;
}
genstats();
ctlqid.vers++;
c.rhdr.qid = ctlqid;
c.rhdr.iounit = 0;
sendreply(0);
return;
}
if(delegate() == 0){
mf->qid = s.rhdr.qid;
if(c.thdr.mode & OTRUNC)
iget(&ic, mf->qid);
}
}
void
rcreate(Mfile *mf)
{
if(statson && ctltest(mf)){
sendreply("exists");
return;
}
if(delegate() == 0){
mf->qid = s.rhdr.qid;
mf->qid.vers++;
}
}
void
rclunk(Mfile *mf)
{
if(!mf->busy){
sendreply(0);
return;
}
mf->busy = 0;
delegate();
}
void
rremove(Mfile *mf)
{
if(statson && ctltest(mf)){
sendreply("not removed");
return;
}
mf->busy = 0;
delegate();
}
void
rread(Mfile *mf)
{
int cnt, done;
long n;
vlong off, first;
char *cp;
char data[MAXFDATA];
Ibuf *b;
off = c.thdr.offset;
first = off;
cnt = c.thdr.count;
if(statson && ctltest(mf)){
if(cnt > statlen-off)
c.rhdr.count = statlen-off;
else
c.rhdr.count = cnt;
if((int)c.rhdr.count < 0){
sendreply("eof");
return;
}
c.rhdr.data = statbuf + off;
sendreply(0);
return;
}
if(mf->qid.type & (QTDIR|QTAUTH)){
delegate();
if (statson) {
cfsstat.ndirread++;
if(c.rhdr.count > 0){
cfsstat.bytesread += c.rhdr.count;
cfsstat.bytesfromdirs += c.rhdr.count;
}
}
return;
}
b = iget(&ic, mf->qid);
if(b == 0){
DPRINT(2, "delegating read\n");
delegate();
if (statson){
cfsstat.ndelegateread++;
if(c.rhdr.count > 0){
cfsstat.bytesread += c.rhdr.count;
cfsstat.bytesfromserver += c.rhdr.count;
}
}
return;
}
cp = data;
done = 0;
while(cnt>0 && !done){
if(off >= b->inode.length){
DPRINT(2, "offset %lld greater than length %lld\n",
off, b->inode.length);
break;
}
n = fread(&ic, b, cp, off, cnt);
if(n <= 0){
n = -n;
if(n==0 || n>cnt)
n = cnt;
DPRINT(2,
"fetch %ld bytes of data from server at offset %lld\n",
n, off);
s.thdr.type = c.thdr.type;
s.thdr.fid = c.thdr.fid;
s.thdr.tag = c.thdr.tag;
s.thdr.offset = off;
s.thdr.count = n;
if(statson)
cfsstat.ndelegateread++;
if(askserver() < 0){
sendreply(s.rhdr.ename);
return;
}
if(s.rhdr.count != n)
done = 1;
n = s.rhdr.count;
if(n == 0){
/* end of file */
if(b->inode.length > off){
DPRINT(2, "file %llud.%ld, length %lld\n",
b->inode.qid.path,
b->inode.qid.vers, off);
b->inode.length = off;
}
break;
}
memmove(cp, s.rhdr.data, n);
fwrite(&ic, b, cp, off, n);
if (statson){
cfsstat.bytestocache += n;
cfsstat.bytesfromserver += n;
}
}else{
DPRINT(2, "fetched %ld bytes from cache\n", n);
if(statson)
cfsstat.bytesfromcache += n;
}
cnt -= n;
off += n;
cp += n;
}
c.rhdr.data = data;
c.rhdr.count = off - first;
if(statson)
cfsstat.bytesread += c.rhdr.count;
sendreply(0);
}
void
rwrite(Mfile *mf)
{
Ibuf *b;
char buf[MAXFDATA];
if(statson && ctltest(mf)){
sendreply("read only");
return;
}
if(mf->qid.type & (QTDIR|QTAUTH)){
delegate();
if(statson && c.rhdr.count > 0)
cfsstat.byteswritten += c.rhdr.count;
return;
}
memmove(buf, c.thdr.data, c.thdr.count);
if(delegate() < 0)
return;
if(s.rhdr.count > 0)
cfsstat.byteswritten += s.rhdr.count;
/* don't modify our cache for append-only data; always read from server*/
if(mf->qid.type & QTAPPEND)
return;
b = iget(&ic, mf->qid);
if(b == 0)
return;
if (b->inode.length < c.thdr.offset + s.rhdr.count)
b->inode.length = c.thdr.offset + s.rhdr.count;
mf->qid.vers++;
if (s.rhdr.count != c.thdr.count)
syslog(0, "cfslog", "rhdr.count %ud, thdr.count %ud",
s.rhdr.count, c.thdr.count);
if(fwrite(&ic, b, buf, c.thdr.offset, s.rhdr.count) == s.rhdr.count){
iinc(&ic, b);
if(statson)
cfsstat.bytestocache += s.rhdr.count;
}
}
void
rstat(Mfile *mf)
{
uchar buf[STATMAX];
Dir d;
if(statson && ctltest(mf)){
d.qid = ctlqid;
d.mode = 0444;
d.length = statlen; /* would be nice to do better */
d.name = "cfsctl";
d.uid = "none";
d.gid = "none";
d.muid = "none";
d.atime = time(nil);
d.mtime = d.atime;
c.rhdr.nstat = convD2M(&d, buf, sizeof buf);
c.rhdr.stat = buf;
sendreply(0);
return;
}
if(delegate() == 0){
Ibuf *b;
convM2D(s.rhdr.stat, s.rhdr.nstat , &d, nil);
mf->qid = d.qid;
b = iget(&ic, mf->qid);
if(b)
b->inode.length = d.length;
}
}
void
rwstat(Mfile *mf)
{
Ibuf *b;
if(statson && ctltest(mf)){
sendreply("read only");
return;
}
delegate();
if(b = iget(&ic, mf->qid))
b->inode.length = MAXLEN;
}
void
error(char *fmt, ...)
{
va_list arg;
static char buf[2048];
va_start(arg, fmt);
vseprint(buf, buf+sizeof(buf), fmt, arg);
va_end(arg);
fprint(2, "%s: %s\n", argv0, buf);
exits("error");
}
void
warning(char *s)
{
fprint(2, "cfs: %s: %r\n", s);
}
/*
* send a reply to the client
*/
void
sendreply(char *err)
{
if(err){
c.rhdr.type = Rerror;
c.rhdr.ename = err;
}else{
c.rhdr.type = c.thdr.type+1;
c.rhdr.fid = c.thdr.fid;
}
c.rhdr.tag = c.thdr.tag;
sendmsg(&c, &c.rhdr);
}
/*
* send a request to the server, get the reply, and send that to
* the client
*/
int
delegate(void)
{
int type;
type = c.thdr.type;
if(statson){
cfsstat.sm[type].n++;
cfsstat.sm[type].s = nsec();
}
sendmsg(&s, &c.thdr);
rcvmsg(&s, &s.rhdr);
if(statson)
cfsstat.sm[type].t += nsec() - cfsstat.sm[type].s;
sendmsg(&c, &s.rhdr);
return c.thdr.type+1 == s.rhdr.type ? 0 : -1;
}
/*
* send a request to the server and get a reply
*/
int
askserver(void)
{
int type;
s.thdr.tag = c.thdr.tag;
type = s.thdr.type;
if(statson){
cfsstat.sm[type].n++;
cfsstat.sm[type].s = nsec();
}
sendmsg(&s, &s.thdr);
rcvmsg(&s, &s.rhdr);
if(statson)
cfsstat.sm[type].t += nsec() - cfsstat.sm[type].s;
return s.thdr.type+1 == s.rhdr.type ? 0 : -1;
}
/*
* send/receive messages with logging
*/
void
sendmsg(P9fs *p, Fcall *f)
{
DPRINT(2, "->%s: %F\n", p->name, f);
p->len = convS2M(f, datasnd, messagesize);
if(p->len <= 0)
error("convS2M");
if(write(p->fd[1], datasnd, p->len)!=p->len)
error("sendmsg");
}
void
dump(uchar *p, int len)
{
fprint(2, "%d bytes", len);
while(len-- > 0)
fprint(2, " %.2ux", *p++);
fprint(2, "\n");
}
void
rcvmsg(P9fs *p, Fcall *f)
{
int olen, rlen;
char buf[128];
olen = p->len;
p->len = read9pmsg(p->fd[0], datarcv, sizeof(datarcv));
if(p->len == 0)
exits("");
if(p->len < 0){
snprint(buf, sizeof buf, "read9pmsg(%d)->%ld: %r",
p->fd[0], p->len);
error(buf);
}
if((rlen = convM2S(datarcv, p->len, f)) != p->len)
error("rcvmsg format error, expected length %d, got %d",
rlen, p->len);
if(f->fid >= Nfid){
fprint(2, "<-%s: %d %s on %d\n", p->name, f->type,
mname[f->type]? mname[f->type]: "mystery", f->fid);
dump((uchar*)datasnd, olen);
dump((uchar*)datarcv, p->len);
error("rcvmsg fid out of range");
}
DPRINT(2, "<-%s: %F\n", p->name, f);
}
int
ctltest(Mfile *mf)
{
return mf->busy && mf->qid.type == ctlqid.type &&
mf->qid.path == ctlqid.path;
}
void
genstats(void)
{
int i;
char *p;
p = statbuf;
p += snprint(p, sizeof statbuf+statbuf-p,
" Client Server\n");
p += snprint(p, sizeof statbuf+statbuf-p,
" #calls Δ ms/call Δ #calls Δ ms/call Δ\n");
for (i = 0; i < nelem(cfsstat.cm); i++)
if(cfsstat.cm[i].n || cfsstat.sm[i].n) {
p += snprint(p, sizeof statbuf+statbuf-p,
"%7lud %7lud ", cfsstat.cm[i].n,
cfsstat.cm[i].n - cfsprev.cm[i].n);
if (cfsstat.cm[i].n)
p += snprint(p, sizeof statbuf+statbuf-p,
"%7.3f ", 0.000001*cfsstat.cm[i].t/
cfsstat.cm[i].n);
else
p += snprint(p, sizeof statbuf+statbuf-p,
" ");
if(cfsstat.cm[i].n - cfsprev.cm[i].n)
p += snprint(p, sizeof statbuf+statbuf-p,
"%7.3f ", 0.000001*
(cfsstat.cm[i].t - cfsprev.cm[i].t)/
(cfsstat.cm[i].n - cfsprev.cm[i].n));
else
p += snprint(p, sizeof statbuf+statbuf-p,
" ");
p += snprint(p, sizeof statbuf+statbuf-p,
"%7lud %7lud ", cfsstat.sm[i].n,
cfsstat.sm[i].n - cfsprev.sm[i].n);
if (cfsstat.sm[i].n)
p += snprint(p, sizeof statbuf+statbuf-p,
"%7.3f ", 0.000001*cfsstat.sm[i].t/
cfsstat.sm[i].n);
else
p += snprint(p, sizeof statbuf+statbuf-p,
" ");
if(cfsstat.sm[i].n - cfsprev.sm[i].n)
p += snprint(p, sizeof statbuf+statbuf-p,
"%7.3f ", 0.000001*
(cfsstat.sm[i].t - cfsprev.sm[i].t)/
(cfsstat.sm[i].n - cfsprev.sm[i].n));
else
p += snprint(p, sizeof statbuf+statbuf-p,
" ");
p += snprint(p, sizeof statbuf+statbuf-p, "%s\n",
mname[i]);
}
p += snprint(p, sizeof statbuf+statbuf-p, "%7lud %7lud ndirread\n",
cfsstat.ndirread, cfsstat.ndirread - cfsprev.ndirread);
p += snprint(p, sizeof statbuf+statbuf-p, "%7lud %7lud ndelegateread\n",
cfsstat.ndelegateread, cfsstat.ndelegateread -
cfsprev.ndelegateread);
p += snprint(p, sizeof statbuf+statbuf-p, "%7lud %7lud ninsert\n",
cfsstat.ninsert, cfsstat.ninsert - cfsprev.ninsert);
p += snprint(p, sizeof statbuf+statbuf-p, "%7lud %7lud ndelete\n",
cfsstat.ndelete, cfsstat.ndelete - cfsprev.ndelete);
p += snprint(p, sizeof statbuf+statbuf-p, "%7lud %7lud nupdate\n",
cfsstat.nupdate, cfsstat.nupdate - cfsprev.nupdate);
p += snprint(p, sizeof statbuf+statbuf-p, "%7llud %7llud bytesread\n",
cfsstat.bytesread, cfsstat.bytesread - cfsprev.bytesread);
p += snprint(p, sizeof statbuf+statbuf-p, "%7llud %7llud byteswritten\n",
cfsstat.byteswritten, cfsstat.byteswritten -
cfsprev.byteswritten);
p += snprint(p, sizeof statbuf+statbuf-p, "%7llud %7llud bytesfromserver\n",
cfsstat.bytesfromserver, cfsstat.bytesfromserver -
cfsprev.bytesfromserver);
p += snprint(p, sizeof statbuf+statbuf-p, "%7llud %7llud bytesfromdirs\n",
cfsstat.bytesfromdirs, cfsstat.bytesfromdirs -
cfsprev.bytesfromdirs);
p += snprint(p, sizeof statbuf+statbuf-p, "%7llud %7llud bytesfromcache\n",
cfsstat.bytesfromcache, cfsstat.bytesfromcache -
cfsprev.bytesfromcache);
p += snprint(p, sizeof statbuf+statbuf-p, "%7llud %7llud bytestocache\n",
cfsstat.bytestocache, cfsstat.bytestocache -
cfsprev.bytestocache);
statlen = p - statbuf;
cfsprev = cfsstat;
}