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Diffstat (limited to 'net/9p/client.c')
-rw-r--r--net/9p/client.c167
1 files changed, 122 insertions, 45 deletions
diff --git a/net/9p/client.c b/net/9p/client.c
index 8af95b2dddd6..e3e5bf4469ce 100644
--- a/net/9p/client.c
+++ b/net/9p/client.c
@@ -46,6 +46,7 @@ enum {
Opt_msize,
Opt_trans,
Opt_legacy,
+ Opt_version,
Opt_err,
};
@@ -53,9 +54,42 @@ static const match_table_t tokens = {
{Opt_msize, "msize=%u"},
{Opt_legacy, "noextend"},
{Opt_trans, "trans=%s"},
+ {Opt_version, "version=%s"},
{Opt_err, NULL},
};
+inline int p9_is_proto_dotl(struct p9_client *clnt)
+{
+ return (clnt->proto_version == p9_proto_2000L);
+}
+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)
+{
+ unsigned char version = -EINVAL;
+ if (!strncmp("9p2000", name->from, name->to-name->from)) {
+ version = p9_proto_legacy;
+ P9_DPRINTK(P9_DEBUG_9P, "Protocol version: Legacy\n");
+ } else if (!strncmp("9p2000.u", name->from, name->to-name->from)) {
+ version = p9_proto_2000u;
+ P9_DPRINTK(P9_DEBUG_9P, "Protocol version: 9P2000.u\n");
+ } else if (!strncmp("9p2000.L", name->from, name->to-name->from)) {
+ version = p9_proto_2000L;
+ P9_DPRINTK(P9_DEBUG_9P, "Protocol version: 9P2000.L\n");
+ } else {
+ P9_DPRINTK(P9_DEBUG_ERROR, "Unknown protocol version %s. ",
+ name->from);
+ }
+ return version;
+}
+
static struct p9_req_t *
p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...);
@@ -69,24 +103,25 @@ p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...);
static int parse_opts(char *opts, struct p9_client *clnt)
{
- char *options;
+ char *options, *tmp_options;
char *p;
substring_t args[MAX_OPT_ARGS];
int option;
int ret = 0;
- clnt->dotu = 1;
+ clnt->proto_version = p9_proto_2000u;
clnt->msize = 8192;
if (!opts)
return 0;
- options = kstrdup(opts, GFP_KERNEL);
- if (!options) {
+ tmp_options = kstrdup(opts, GFP_KERNEL);
+ if (!tmp_options) {
P9_DPRINTK(P9_DEBUG_ERROR,
"failed to allocate copy of option string\n");
return -ENOMEM;
}
+ options = tmp_options;
while ((p = strsep(&options, ",")) != NULL) {
int token;
@@ -108,16 +143,30 @@ static int parse_opts(char *opts, struct p9_client *clnt)
break;
case Opt_trans:
clnt->trans_mod = v9fs_get_trans_by_name(&args[0]);
+ if(clnt->trans_mod == NULL) {
+ P9_DPRINTK(P9_DEBUG_ERROR,
+ "Could not find request transport: %s\n",
+ (char *) &args[0]);
+ ret = -EINVAL;
+ goto free_and_return;
+ }
break;
case Opt_legacy:
- clnt->dotu = 0;
+ clnt->proto_version = p9_proto_legacy;
+ break;
+ case Opt_version:
+ ret = get_protocol_version(&args[0]);
+ if (ret == -EINVAL)
+ goto free_and_return;
+ clnt->proto_version = ret;
break;
default:
continue;
}
}
- kfree(options);
+free_and_return:
+ kfree(tmp_options);
return ret;
}
@@ -401,14 +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))
@@ -506,7 +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);
@@ -618,14 +668,31 @@ 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);
- req = p9_client_rpc(c, P9_TVERSION, "ds", c->msize,
- c->dotu ? "9P2000.u" : "9P2000");
+ P9_DPRINTK(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n",
+ c->msize, c->proto_version);
+
+ switch (c->proto_version) {
+ case p9_proto_2000L:
+ req = p9_client_rpc(c, P9_TVERSION, "ds",
+ c->msize, "9P2000.L");
+ break;
+ case p9_proto_2000u:
+ req = p9_client_rpc(c, P9_TVERSION, "ds",
+ c->msize, "9P2000.u");
+ break;
+ case p9_proto_legacy:
+ req = p9_client_rpc(c, P9_TVERSION, "ds",
+ c->msize, "9P2000");
+ break;
+ default:
+ return -EINVAL;
+ break;
+ }
+
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);
@@ -633,10 +700,12 @@ 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.L", 8))
+ c->proto_version = p9_proto_2000L;
+ else 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;
@@ -667,18 +736,12 @@ struct p9_client *p9_client_create(const char *dev_name, char *options)
clnt->trans = NULL;
spin_lock_init(&clnt->lock);
INIT_LIST_HEAD(&clnt->fidlist);
- clnt->fidpool = p9_idpool_create();
- if (IS_ERR(clnt->fidpool)) {
- err = PTR_ERR(clnt->fidpool);
- clnt->fidpool = NULL;
- goto error;
- }
p9_tag_init(clnt);
err = parse_opts(options, clnt);
if (err < 0)
- goto error;
+ goto free_client;
if (!clnt->trans_mod)
clnt->trans_mod = v9fs_get_default_trans();
@@ -687,27 +750,40 @@ struct p9_client *p9_client_create(const char *dev_name, char *options)
err = -EPROTONOSUPPORT;
P9_DPRINTK(P9_DEBUG_ERROR,
"No transport defined or default transport\n");
- goto error;
+ goto free_client;
}
- P9_DPRINTK(P9_DEBUG_MUX, "clnt %p trans %p msize %d dotu %d\n",
- clnt, clnt->trans_mod, clnt->msize, clnt->dotu);
+ clnt->fidpool = p9_idpool_create();
+ if (IS_ERR(clnt->fidpool)) {
+ err = PTR_ERR(clnt->fidpool);
+ clnt->fidpool = NULL;
+ goto put_trans;
+ }
+
+ 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)
- goto error;
+ goto destroy_fidpool;
if ((clnt->msize+P9_IOHDRSZ) > clnt->trans_mod->maxsize)
clnt->msize = clnt->trans_mod->maxsize-P9_IOHDRSZ;
err = p9_client_version(clnt);
if (err)
- goto error;
+ goto close_trans;
return clnt;
-error:
- p9_client_destroy(clnt);
+close_trans:
+ clnt->trans_mod->close(clnt);
+destroy_fidpool:
+ p9_idpool_destroy(clnt->fidpool);
+put_trans:
+ v9fs_put_trans(clnt->trans_mod);
+free_client:
+ kfree(clnt);
return ERR_PTR(err);
}
EXPORT_SYMBOL(p9_client_create);
@@ -768,7 +844,7 @@ 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);
@@ -817,7 +893,7 @@ 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);
@@ -875,7 +951,7 @@ 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);
@@ -936,7 +1012,7 @@ 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;
@@ -981,7 +1057,7 @@ 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;
@@ -1082,7 +1158,7 @@ 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;
@@ -1143,7 +1219,7 @@ 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;
@@ -1183,7 +1259,7 @@ 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);
@@ -1210,14 +1286,15 @@ 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;
+ /* NOTE: size shouldn't include its own length */
/* size[2] type[2] dev[4] qid[13] */
/* mode[4] atime[4] mtime[4] length[8]*/
/* name[s] uid[s] gid[s] muid[s] */
- ret = 2+2+4+13+4+4+4+8+2+2+2+2;
+ ret = 2+4+13+4+4+4+8+2+2+2+2;
if (wst->name)
ret += strlen(wst->name);
@@ -1228,7 +1305,7 @@ 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);
@@ -1245,7 +1322,7 @@ 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"
@@ -1258,7 +1335,7 @@ int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
wst->name, wst->uid, wst->gid, wst->muid, wst->extension,
wst->n_uid, wst->n_gid, wst->n_muid);
- req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size, wst);
+ req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst);
if (IS_ERR(req)) {
err = PTR_ERR(req);
goto error;
generated by cgit v1.2.3 (git 2.39.0) at 2024-12-23 08:14:29 +0300