9P2010.L handshake: Remove "dotu" variable

Removes 'dotu' variable and make everything dependent
on 'proto_version' field.

Signed-off-by: Sripathi Kodi <sripathik@in.ibm.com>
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>

diff --git a/fs/9p/v9fs.c b/fs/9p/v9fs.c
index 247f10a934ed610dfe3faff143d8268c3d17e534..6c7f6a2511154a3016eb1bc433f012bb1d3128f5 100644 (file)
--- a/fs/9p/v9fs.c
+++ b/fs/9p/v9fs.c
@@ -262,7 +262,7 @@ struct p9_fid *v9fs_session_init(struct v9fs_session_info *v9ses,
                goto error;
        }
 
-       if (!v9ses->clnt->dotu)
+       if (!p9_is_proto_dotu(v9ses->clnt))
                v9ses->flags &= ~V9FS_PROTO_2000U;
 
        v9ses->maxdata = v9ses->clnt->msize - P9_IOHDRSZ;

diff --git a/fs/9p/vfs_dir.c b/fs/9p/vfs_dir.c
index 15cce53bf61e7832e92fd8fbc72f08f220a8084a..6580aa4495414bd33a2d260eec8eb95c2bc0a59e 100644 (file)
--- a/fs/9p/vfs_dir.c
+++ b/fs/9p/vfs_dir.c
@@ -135,7 +135,7 @@ static int v9fs_dir_readdir(struct file *filp, void *dirent, filldir_t filldir)
                while (rdir->head < rdir->tail) {
                        err = p9stat_read(rdir->buf + rdir->head,
                                                buflen - rdir->head, &st,
-                                               fid->clnt->dotu);
+                                               fid->clnt->proto_version);
                        if (err) {
                                P9_DPRINTK(P9_DEBUG_VFS, "returned %d\n", err);
                                err = -EIO;

diff --git a/include/net/9p/client.h b/include/net/9p/client.h
index d40f8c55dfae465e66cee541b220e1f134c540fc..52e1fff709e43fbd1f825809036994b5aaa76a87 100644 (file)
--- a/include/net/9p/client.h
+++ b/include/net/9p/client.h
@@ -151,7 +151,6 @@ struct p9_req_t {
 struct p9_client {
        spinlock_t lock; /* protect client structure */
        int msize;
-       unsigned char dotu;
        unsigned char proto_version;
        struct p9_trans_module *trans_mod;
        enum p9_trans_status status;
@@ -224,5 +223,7 @@ int p9_parse_header(struct p9_fcall *, int32_t *, int8_t *, int16_t *, int);
 int p9stat_read(char *, int, struct p9_wstat *, int);
 void p9stat_free(struct p9_wstat *);
 
+int p9_is_proto_dotu(struct p9_client *clnt);
+int p9_is_proto_dotl(struct p9_client *clnt);
 
 #endif /* NET_9P_CLIENT_H */

diff --git a/net/9p/client.c b/net/9p/client.c
index 3b5f3c94a6ebe11f9d4482a85d55ee10679bbb30..9994676e57dac2d9daaeedaf819c3f24c7bb4100 100644 (file)
--- a/net/9p/client.c
+++ b/net/9p/client.c
@@ -58,6 +58,18 @@ static const match_table_t tokens = {
        {Opt_err, NULL},
 };
 
+inline int p9_is_proto_dotl(struct p9_client *clnt)
+{
+       return (clnt->proto_version == p9_proto_2010L);
+}
+EXPORT_SYMBOL(p9_is_proto_dotl);
+
+inline int p9_is_proto_dotu(struct p9_client *clnt)
+{
+       return (clnt->proto_version == p9_proto_2000u);
+}
+EXPORT_SYMBOL(p9_is_proto_dotu);
+
 /* Interpret mount option for protocol version */
 static unsigned char get_protocol_version(const substring_t *name)
 {
@@ -97,7 +109,7 @@ static int parse_opts(char *opts, struct p9_client *clnt)
        int option;
        int ret = 0;
 
-       clnt->dotu = 1;
+       clnt->proto_version = p9_proto_2000u;
        clnt->msize = 8192;
 
        if (!opts)
@@ -140,7 +152,7 @@ static int parse_opts(char *opts, struct p9_client *clnt)
                        }
                        break;
                case Opt_legacy:
-                       clnt->dotu = 0;
+                       clnt->proto_version = p9_proto_legacy;
                        break;
                case Opt_version:
                        ret = get_protocol_version(&args[0]);
@@ -438,14 +450,15 @@ static int p9_check_errors(struct p9_client *c, struct p9_req_t *req)
                int ecode;
                char *ename;
 
-               err = p9pdu_readf(req->rc, c->dotu, "s?d", &ename, &ecode);
+               err = p9pdu_readf(req->rc, c->proto_version, "s?d",
+                                                       &ename, &ecode);
                if (err) {
                        P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse error%d\n",
                                                                        err);
                        return err;
                }
 
-               if (c->dotu)
+               if (p9_is_proto_dotu(c))
                        err = -ecode;
 
                if (!err || !IS_ERR_VALUE(err))
@@ -543,7 +556,7 @@ p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
        /* marshall the data */
        p9pdu_prepare(req->tc, tag, type);
        va_start(ap, fmt);
-       err = p9pdu_vwritef(req->tc, c->dotu, fmt, ap);
+       err = p9pdu_vwritef(req->tc, c->proto_version, fmt, ap);
        va_end(ap);
        p9pdu_finalize(req->tc);
 
@@ -655,14 +668,14 @@ int p9_client_version(struct p9_client *c)
        char *version;
        int msize;
 
-       P9_DPRINTK(P9_DEBUG_9P, ">>> TVERSION msize %d extended %d\n",
-                                                       c->msize, c->dotu);
+       P9_DPRINTK(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n",
+                                               c->msize, c->proto_version);
        req = p9_client_rpc(c, P9_TVERSION, "ds", c->msize,
-                               c->dotu ? "9P2000.u" : "9P2000");
+                               p9_is_proto_dotu(c) ? "9P2000.u" : "9P2000");
        if (IS_ERR(req))
                return PTR_ERR(req);
 
-       err = p9pdu_readf(req->rc, c->dotu, "ds", &msize, &version);
+       err = p9pdu_readf(req->rc, c->proto_version, "ds", &msize, &version);
        if (err) {
                P9_DPRINTK(P9_DEBUG_9P, "version error %d\n", err);
                p9pdu_dump(1, req->rc);
@@ -670,10 +683,10 @@ int p9_client_version(struct p9_client *c)
        }
 
        P9_DPRINTK(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version);
-       if (!memcmp(version, "9P2000.u", 8))
-               c->dotu = 1;
-       else if (!memcmp(version, "9P2000", 6))
-               c->dotu = 0;
+       if (!strncmp(version, "9P2000.u", 8))
+               c->proto_version = p9_proto_2000u;
+       else if (!strncmp(version, "9P2000", 6))
+               c->proto_version = p9_proto_legacy;
        else {
                err = -EREMOTEIO;
                goto error;
@@ -728,8 +741,8 @@ struct p9_client *p9_client_create(const char *dev_name, char *options)
                goto put_trans;
        }
 
-       P9_DPRINTK(P9_DEBUG_MUX, "clnt %p trans %p msize %d dotu %d\n",
-               clnt, clnt->trans_mod, clnt->msize, clnt->dotu);
+       P9_DPRINTK(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n",
+               clnt, clnt->trans_mod, clnt->msize, clnt->proto_version);
 
        err = clnt->trans_mod->create(clnt, dev_name, options);
        if (err)
@@ -812,7 +825,7 @@ struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
                goto error;
        }
 
-       err = p9pdu_readf(req->rc, clnt->dotu, "Q", &qid);
+       err = p9pdu_readf(req->rc, clnt->proto_version, "Q", &qid);
        if (err) {
                p9pdu_dump(1, req->rc);
                p9_free_req(clnt, req);
@@ -861,7 +874,7 @@ p9_client_auth(struct p9_client *clnt, char *uname, u32 n_uname, char *aname)
                goto error;
        }
 
-       err = p9pdu_readf(req->rc, clnt->dotu, "Q", &qid);
+       err = p9pdu_readf(req->rc, clnt->proto_version, "Q", &qid);
        if (err) {
                p9pdu_dump(1, req->rc);
                p9_free_req(clnt, req);
@@ -919,7 +932,7 @@ struct p9_fid *p9_client_walk(struct p9_fid *oldfid, int nwname, char **wnames,
                goto error;
        }
 
-       err = p9pdu_readf(req->rc, clnt->dotu, "R", &nwqids, &wqids);
+       err = p9pdu_readf(req->rc, clnt->proto_version, "R", &nwqids, &wqids);
        if (err) {
                p9pdu_dump(1, req->rc);
                p9_free_req(clnt, req);
@@ -980,7 +993,7 @@ int p9_client_open(struct p9_fid *fid, int mode)
                goto error;
        }
 
-       err = p9pdu_readf(req->rc, clnt->dotu, "Qd", &qid, &iounit);
+       err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
        if (err) {
                p9pdu_dump(1, req->rc);
                goto free_and_error;
@@ -1025,7 +1038,7 @@ int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode,
                goto error;
        }
 
-       err = p9pdu_readf(req->rc, clnt->dotu, "Qd", &qid, &iounit);
+       err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
        if (err) {
                p9pdu_dump(1, req->rc);
                goto free_and_error;
@@ -1126,7 +1139,7 @@ p9_client_read(struct p9_fid *fid, char *data, char __user *udata, u64 offset,
                goto error;
        }
 
-       err = p9pdu_readf(req->rc, clnt->dotu, "D", &count, &dataptr);
+       err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
        if (err) {
                p9pdu_dump(1, req->rc);
                goto free_and_error;
@@ -1187,7 +1200,7 @@ p9_client_write(struct p9_fid *fid, char *data, const char __user *udata,
                goto error;
        }
 
-       err = p9pdu_readf(req->rc, clnt->dotu, "d", &count);
+       err = p9pdu_readf(req->rc, clnt->proto_version, "d", &count);
        if (err) {
                p9pdu_dump(1, req->rc);
                goto free_and_error;
@@ -1227,7 +1240,7 @@ struct p9_wstat *p9_client_stat(struct p9_fid *fid)
                goto error;
        }
 
-       err = p9pdu_readf(req->rc, clnt->dotu, "wS", &ignored, ret);
+       err = p9pdu_readf(req->rc, clnt->proto_version, "wS", &ignored, ret);
        if (err) {
                p9pdu_dump(1, req->rc);
                p9_free_req(clnt, req);
@@ -1254,7 +1267,7 @@ error:
 }
 EXPORT_SYMBOL(p9_client_stat);
 
-static int p9_client_statsize(struct p9_wstat *wst, int optional)
+static int p9_client_statsize(struct p9_wstat *wst, int proto_version)
 {
        int ret;
 
@@ -1273,7 +1286,7 @@ static int p9_client_statsize(struct p9_wstat *wst, int optional)
        if (wst->muid)
                ret += strlen(wst->muid);
 
-       if (optional) {
+       if (proto_version == p9_proto_2000u) {
                ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */
                if (wst->extension)
                        ret += strlen(wst->extension);
@@ -1290,7 +1303,7 @@ int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
 
        err = 0;
        clnt = fid->clnt;
-       wst->size = p9_client_statsize(wst, clnt->dotu);
+       wst->size = p9_client_statsize(wst, clnt->proto_version);
        P9_DPRINTK(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid);
        P9_DPRINTK(P9_DEBUG_9P,
                "     sz=%x type=%x dev=%x qid=%x.%llx.%x\n"

diff --git a/net/9p/protocol.c b/net/9p/protocol.c
index fc70147c771e15c2542a92e7286560f7faa1b98a..94f5a8f65e9c3649c8417a62c0c87b1e1ef708cd 100644 (file)
--- a/net/9p/protocol.c
+++ b/net/9p/protocol.c
@@ -52,7 +52,7 @@
 #endif
 
 static int
-p9pdu_writef(struct p9_fcall *pdu, int optional, const char *fmt, ...);
+p9pdu_writef(struct p9_fcall *pdu, int proto_version, const char *fmt, ...);
 
 #ifdef CONFIG_NET_9P_DEBUG
 void
@@ -144,7 +144,8 @@ pdu_write_u(struct p9_fcall *pdu, const char __user *udata, size_t size)
 */
 
 static int
-p9pdu_vreadf(struct p9_fcall *pdu, int optional, const char *fmt, va_list ap)
+p9pdu_vreadf(struct p9_fcall *pdu, int proto_version, const char *fmt,
+       va_list ap)
 {
        const char *ptr;
        int errcode = 0;
@@ -194,7 +195,8 @@ p9pdu_vreadf(struct p9_fcall *pdu, int optional, const char *fmt, va_list ap)
                                int16_t len;
                                int size;
 
-                               errcode = p9pdu_readf(pdu, optional, "w", &len);
+                               errcode = p9pdu_readf(pdu, proto_version,
+                                                               "w", &len);
                                if (errcode)
                                        break;
 
@@ -217,7 +219,7 @@ p9pdu_vreadf(struct p9_fcall *pdu, int optional, const char *fmt, va_list ap)
                                struct p9_qid *qid =
                                    va_arg(ap, struct p9_qid *);
 
-                               errcode = p9pdu_readf(pdu, optional, "bdq",
+                               errcode = p9pdu_readf(pdu, proto_version, "bdq",
                                                      &qid->type, &qid->version,
                                                      &qid->path);
                        }
@@ -230,7 +232,7 @@ p9pdu_vreadf(struct p9_fcall *pdu, int optional, const char *fmt, va_list ap)
                                stbuf->n_uid = stbuf->n_gid = stbuf->n_muid =
                                                                        -1;
                                errcode =
-                                   p9pdu_readf(pdu, optional,
+                                   p9pdu_readf(pdu, proto_version,
                                                "wwdQdddqssss?sddd",
                                                &stbuf->size, &stbuf->type,
                                                &stbuf->dev, &stbuf->qid,
@@ -250,7 +252,7 @@ p9pdu_vreadf(struct p9_fcall *pdu, int optional, const char *fmt, va_list ap)
                                void **data = va_arg(ap, void **);
 
                                errcode =
-                                   p9pdu_readf(pdu, optional, "d", count);
+                                   p9pdu_readf(pdu, proto_version, "d", count);
                                if (!errcode) {
                                        *count =
                                            MIN(*count,
@@ -263,8 +265,8 @@ p9pdu_vreadf(struct p9_fcall *pdu, int optional, const char *fmt, va_list ap)
                                int16_t *nwname = va_arg(ap, int16_t *);
                                char ***wnames = va_arg(ap, char ***);
 
-                               errcode =
-                                   p9pdu_readf(pdu, optional, "w", nwname);
+                               errcode = p9pdu_readf(pdu, proto_version,
+                                                               "w", nwname);
                                if (!errcode) {
                                        *wnames =
                                            kmalloc(sizeof(char *) * *nwname,
@@ -278,7 +280,8 @@ p9pdu_vreadf(struct p9_fcall *pdu, int optional, const char *fmt, va_list ap)
 
                                        for (i = 0; i < *nwname; i++) {
                                                errcode =
-                                                   p9pdu_readf(pdu, optional,
+                                                   p9pdu_readf(pdu,
+                                                               proto_version,
                                                                "s",
                                                                &(*wnames)[i]);
                                                if (errcode)
@@ -306,7 +309,7 @@ p9pdu_vreadf(struct p9_fcall *pdu, int optional, const char *fmt, va_list ap)
                                *wqids = NULL;
 
                                errcode =
-                                   p9pdu_readf(pdu, optional, "w", nwqid);
+                                   p9pdu_readf(pdu, proto_version, "w", nwqid);
                                if (!errcode) {
                                        *wqids =
                                            kmalloc(*nwqid *
@@ -321,7 +324,8 @@ p9pdu_vreadf(struct p9_fcall *pdu, int optional, const char *fmt, va_list ap)
 
                                        for (i = 0; i < *nwqid; i++) {
                                                errcode =
-                                                   p9pdu_readf(pdu, optional,
+                                                   p9pdu_readf(pdu,
+                                                               proto_version,
                                                                "Q",
                                                                &(*wqids)[i]);
                                                if (errcode)
@@ -336,7 +340,7 @@ p9pdu_vreadf(struct p9_fcall *pdu, int optional, const char *fmt, va_list ap)
                        }
                        break;
                case '?':
-                       if (!optional)
+                       if (proto_version != p9_proto_2000u)
                                return 0;
                        break;
                default:
@@ -352,7 +356,8 @@ p9pdu_vreadf(struct p9_fcall *pdu, int optional, const char *fmt, va_list ap)
 }
 
 int
-p9pdu_vwritef(struct p9_fcall *pdu, int optional, const char *fmt, va_list ap)
+p9pdu_vwritef(struct p9_fcall *pdu, int proto_version, const char *fmt,
+       va_list ap)
 {
        const char *ptr;
        int errcode = 0;
@@ -389,7 +394,8 @@ p9pdu_vwritef(struct p9_fcall *pdu, int optional, const char *fmt, va_list ap)
                                if (sptr)
                                        len = MIN(strlen(sptr), USHORT_MAX);
 
-                               errcode = p9pdu_writef(pdu, optional, "w", len);
+                               errcode = p9pdu_writef(pdu, proto_version,
+                                                               "w", len);
                                if (!errcode && pdu_write(pdu, sptr, len))
                                        errcode = -EFAULT;
                        }
@@ -398,7 +404,7 @@ p9pdu_vwritef(struct p9_fcall *pdu, int optional, const char *fmt, va_list ap)
                                const struct p9_qid *qid =
                                    va_arg(ap, const struct p9_qid *);
                                errcode =
-                                   p9pdu_writef(pdu, optional, "bdq",
+                                   p9pdu_writef(pdu, proto_version, "bdq",
                                                 qid->type, qid->version,
                                                 qid->path);
                        } break;
@@ -406,7 +412,7 @@ p9pdu_vwritef(struct p9_fcall *pdu, int optional, const char *fmt, va_list ap)
                                const struct p9_wstat *stbuf =
                                    va_arg(ap, const struct p9_wstat *);
                                errcode =
-                                   p9pdu_writef(pdu, optional,
+                                   p9pdu_writef(pdu, proto_version,
                                                 "wwdQdddqssss?sddd",
                                                 stbuf->size, stbuf->type,
                                                 stbuf->dev, &stbuf->qid,
@@ -421,8 +427,8 @@ p9pdu_vwritef(struct p9_fcall *pdu, int optional, const char *fmt, va_list ap)
                                int32_t count = va_arg(ap, int32_t);
                                const void *data = va_arg(ap, const void *);
 
-                               errcode =
-                                   p9pdu_writef(pdu, optional, "d", count);
+                               errcode = p9pdu_writef(pdu, proto_version, "d",
+                                                                       count);
                                if (!errcode && pdu_write(pdu, data, count))
                                        errcode = -EFAULT;
                        }
@@ -431,8 +437,8 @@ p9pdu_vwritef(struct p9_fcall *pdu, int optional, const char *fmt, va_list ap)
                                int32_t count = va_arg(ap, int32_t);
                                const char __user *udata =
                                                va_arg(ap, const void __user *);
-                               errcode =
-                                   p9pdu_writef(pdu, optional, "d", count);
+                               errcode = p9pdu_writef(pdu, proto_version, "d",
+                                                                       count);
                                if (!errcode && pdu_write_u(pdu, udata, count))
                                        errcode = -EFAULT;
                        }
@@ -441,14 +447,15 @@ p9pdu_vwritef(struct p9_fcall *pdu, int optional, const char *fmt, va_list ap)
                                int16_t nwname = va_arg(ap, int);
                                const char **wnames = va_arg(ap, const char **);
 
-                               errcode =
-                                   p9pdu_writef(pdu, optional, "w", nwname);
+                               errcode = p9pdu_writef(pdu, proto_version, "w",
+                                                                       nwname);
                                if (!errcode) {
                                        int i;
 
                                        for (i = 0; i < nwname; i++) {
                                                errcode =
-                                                   p9pdu_writef(pdu, optional,
+                                                   p9pdu_writef(pdu,
+                                                               proto_version,
                                                                 "s",
                                                                 wnames[i]);
                                                if (errcode)
@@ -462,14 +469,15 @@ p9pdu_vwritef(struct p9_fcall *pdu, int optional, const char *fmt, va_list ap)
                                struct p9_qid *wqids =
                                    va_arg(ap, struct p9_qid *);
 
-                               errcode =
-                                   p9pdu_writef(pdu, optional, "w", nwqid);
+                               errcode = p9pdu_writef(pdu, proto_version, "w",
+                                                                       nwqid);
                                if (!errcode) {
                                        int i;
 
                                        for (i = 0; i < nwqid; i++) {
                                                errcode =
-                                                   p9pdu_writef(pdu, optional,
+                                                   p9pdu_writef(pdu,
+                                                               proto_version,
                                                                 "Q",
                                                                 &wqids[i]);
                                                if (errcode)
@@ -479,7 +487,7 @@ p9pdu_vwritef(struct p9_fcall *pdu, int optional, const char *fmt, va_list ap)
                        }
                        break;
                case '?':
-                       if (!optional)
+                       if (proto_version != p9_proto_2000u)
                                return 0;
                        break;
                default:
@@ -494,32 +502,32 @@ p9pdu_vwritef(struct p9_fcall *pdu, int optional, const char *fmt, va_list ap)
        return errcode;
 }
 
-int p9pdu_readf(struct p9_fcall *pdu, int optional, const char *fmt, ...)
+int p9pdu_readf(struct p9_fcall *pdu, int proto_version, const char *fmt, ...)
 {
        va_list ap;
        int ret;
 
        va_start(ap, fmt);
-       ret = p9pdu_vreadf(pdu, optional, fmt, ap);
+       ret = p9pdu_vreadf(pdu, proto_version, fmt, ap);
        va_end(ap);
 
        return ret;
 }
 
 static int
-p9pdu_writef(struct p9_fcall *pdu, int optional, const char *fmt, ...)
+p9pdu_writef(struct p9_fcall *pdu, int proto_version, const char *fmt, ...)
 {
        va_list ap;
        int ret;
 
        va_start(ap, fmt);
-       ret = p9pdu_vwritef(pdu, optional, fmt, ap);
+       ret = p9pdu_vwritef(pdu, proto_version, fmt, ap);
        va_end(ap);
 
        return ret;
 }
 
-int p9stat_read(char *buf, int len, struct p9_wstat *st, int dotu)
+int p9stat_read(char *buf, int len, struct p9_wstat *st, int proto_version)
 {
        struct p9_fcall fake_pdu;
        int ret;
@@ -529,7 +537,7 @@ int p9stat_read(char *buf, int len, struct p9_wstat *st, int dotu)
        fake_pdu.sdata = buf;
        fake_pdu.offset = 0;
 
-       ret = p9pdu_readf(&fake_pdu, dotu, "S", st);
+       ret = p9pdu_readf(&fake_pdu, proto_version, "S", st);
        if (ret) {
                P9_DPRINTK(P9_DEBUG_9P, "<<< p9stat_read failed: %d\n", ret);
                p9pdu_dump(1, &fake_pdu);

diff --git a/net/9p/protocol.h b/net/9p/protocol.h
index ccde462e7ac57173fa4eb8aea0131d6225357fef..2431c0f38d56784c02f42e077fcaa990e523882c 100644 (file)
--- a/net/9p/protocol.h
+++ b/net/9p/protocol.h
@@ -25,9 +25,9 @@
  *
  */
 
-int
-p9pdu_vwritef(struct p9_fcall *pdu, int optional, const char *fmt, va_list ap);
-int p9pdu_readf(struct p9_fcall *pdu, int optional, const char *fmt, ...);
+int p9pdu_vwritef(struct p9_fcall *pdu, int proto_version, const char *fmt,
+                                                               va_list ap);
+int p9pdu_readf(struct p9_fcall *pdu, int proto_version, const char *fmt, ...);
 int p9pdu_prepare(struct p9_fcall *pdu, int16_t tag, int8_t type);
 int p9pdu_finalize(struct p9_fcall *pdu);
 void p9pdu_dump(int, struct p9_fcall *);