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authorSripathi Kodi <sripathik@in.ibm.com>2010-03-05 18:49:11 +0000
committerEric Van Hensbergen <ericvh@gmail.com>2010-03-05 15:04:42 -0600
commit0fb80abd911a7cb1e6548b5279568dc1e8949702 (patch)
tree0c179f49f2f0d0bf2c979ee1b1f1cfd864122029
parentdd6102fbd917889384d89bc427e98e85e8fda000 (diff)
9P2010.L handshake: Add mount option
Add new mount V9FS mount option to specify protocol version This patch adds a new mount option to specify protocol version. With this option it is possible to use "-o version=" switch to specify 9P protocol version to use. Valid options for version are: 9p2000 9p2000.u 9p2010.L Signed-off-by: Sripathi Kodi <sripathik@in.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
-rw-r--r--include/net/9p/client.h15
-rw-r--r--net/9p/client.c28
2 files changed, 43 insertions, 0 deletions
diff --git a/include/net/9p/client.h b/include/net/9p/client.h
index fb00b329f0d3..d40f8c55dfae 100644
--- a/include/net/9p/client.h
+++ b/include/net/9p/client.h
@@ -29,6 +29,19 @@
/* Number of requests per row */
#define P9_ROW_MAXTAG 255
+/** enum p9_proto_versions - 9P protocol versions
+ * @p9_proto_legacy: 9P Legacy mode, pre-9P2000.u
+ * @p9_proto_2000u: 9P2000.u extension
+ * @p9_proto_2010L: 9P2010.L extension
+ */
+
+enum p9_proto_versions{
+ p9_proto_legacy = 0,
+ p9_proto_2000u = 1,
+ p9_proto_2010L = 2,
+};
+
+
/**
* enum p9_trans_status - different states of underlying transports
* @Connected: transport is connected and healthy
@@ -111,6 +124,7 @@ struct p9_req_t {
* @lock: protect @fidlist
* @msize: maximum data size negotiated by protocol
* @dotu: extension flags negotiated by protocol
+ * @proto_version: 9P protocol version to use
* @trans_mod: module API instantiated with this client
* @trans: tranport instance state and API
* @conn: connection state information used by trans_fd
@@ -138,6 +152,7 @@ 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;
void *trans;
diff --git a/net/9p/client.c b/net/9p/client.c
index 09d4f1e2e4a8..3b5f3c94a6eb 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 +54,30 @@ static const match_table_t tokens = {
{Opt_msize, "msize=%u"},
{Opt_legacy, "noextend"},
{Opt_trans, "trans=%s"},
+ {Opt_version, "version=%s"},
{Opt_err, NULL},
};
+/* 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("9p2010.L", name->from, name->to-name->from)) {
+ version = p9_proto_2010L;
+ P9_DPRINTK(P9_DEBUG_9P, "Protocol version: 9P2010.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, ...);
@@ -120,6 +142,12 @@ static int parse_opts(char *opts, struct p9_client *clnt)
case Opt_legacy:
clnt->dotu = 0;
break;
+ case Opt_version:
+ ret = get_protocol_version(&args[0]);
+ if (ret == -EINVAL)
+ goto free_and_return;
+ clnt->proto_version = ret;
+ break;
default:
continue;
}