+/*
+ * Client Option Parsing (code inspired by NFS code)
+ * - a little lazy - parse all client options
+ */
+
+enum {
+ Opt_msize,
+ Opt_trans,
+ Opt_legacy,
+ Opt_err,
+};
+
+static match_table_t tokens = {
+ {Opt_msize, "msize=%u"},
+ {Opt_legacy, "noextend"},
+ {Opt_trans, "trans=%s"},
+ {Opt_err, NULL},
+};
+
+/**
+ * v9fs_parse_options - parse mount options into session structure
+ * @options: options string passed from mount
+ * @v9ses: existing v9fs session information
+ *
+ * Return 0 upon success, -ERRNO upon failure
+ */
+
+static int parse_opts(char *opts, struct p9_client *clnt)
+{
+ char *options;
+ char *p;
+ substring_t args[MAX_OPT_ARGS];
+ int option;
+ int ret = 0;
+
+ clnt->dotu = 1;
+ clnt->msize = 8192;
+
+ if (!opts)
+ return 0;
+
+ options = kstrdup(opts, GFP_KERNEL);
+ if (!options) {
+ P9_DPRINTK(P9_DEBUG_ERROR,
+ "failed to allocate copy of option string\n");
+ return -ENOMEM;
+ }
+
+ while ((p = strsep(&options, ",")) != NULL) {
+ int token;
+ if (!*p)
+ continue;
+ token = match_token(p, tokens, args);
+ if (token < Opt_trans) {
+ int r = match_int(&args[0], &option);
+ if (r < 0) {
+ P9_DPRINTK(P9_DEBUG_ERROR,
+ "integer field, but no integer?\n");
+ ret = r;
+ continue;
+ }
+ }
+ switch (token) {
+ case Opt_msize:
+ clnt->msize = option;
+ break;
+ case Opt_trans:
+ clnt->trans_mod = v9fs_get_trans_by_name(&args[0]);
+ break;
+ case Opt_legacy:
+ clnt->dotu = 0;
+ break;
+ default:
+ continue;
+ }
+ }
+
+ if (!clnt->trans_mod)
+ clnt->trans_mod = v9fs_get_default_trans();
+
+ kfree(options);
+ return ret;
+}
+
+
+/**
+ * p9_client_rpc - sends 9P request and waits until a response is available.
+ * The function can be interrupted.
+ * @c: client data
+ * @tc: request to be sent
+ * @rc: pointer where a pointer to the response is stored
+ */
+int
+p9_client_rpc(struct p9_client *c, struct p9_fcall *tc,
+ struct p9_fcall **rc)
+{
+ return c->trans->rpc(c->trans, tc, rc);
+}
+
+struct p9_client *p9_client_create(const char *dev_name, char *options)