gluster-block: listen on unix and inet

from now We basically have 2 RPC connections,
1. Between gluster block CLI and local gluster-blockd
   This connection is basically UNIX/local netid ,listening on
   /var/run/gluster-blockd.socket file.

The CLI always Send/Receive the commands to/from the local
gluster-blockd via local rpc.

2. Between gluster-blockd's, i.e local (to cli) gluster-blockd and the
   gluster-blockd's running on remote(blockhost)
   This is the tcp connection. The rpc requests are listening on 24006

Also from now gluster-blockd is multi threaded (As of now 2 threads)

Lets consider the Create Request to understand what each thread solves

Thread1 (THE CLI THREAD)
 * Listening on local RPC
 * Generate the GBID (UUID) and create the entry with name GBID in the
   given volume with a requested size.
 * And Send the Configuration requests to remote hosts,
   waits for the replies
   (HINt: after this point Read Thread2 and come back)
 * Return to CLI.

Thread 2 (THE SERVER THREAD)
 * Listens on 24006
 * On Receiving an event, read the structure.
 * Executes the required "targetcli bla bla bla" command locally
 * Fills the command exitcode and the output in the RPC reply structure
   and send reply

Signed-off-by: Prasanna Kumar Kalever <prasanna.kalever@redhat.com>

1 files changed, 27 insertions, 4 deletions

diff --git a/rpc/block.x b/rpc/block.x
index c88fdf2..b563c9e 100644
--- a/rpc/block.x
+++ b/rpc/block.x
@@ -1,12 +1,35 @@
 
+struct blockCreate {
+  char      volume[255];
+  char      volfileserver[255];
+  char      gbid[127];                   /* uuid */
+  u_quad_t  size;
+  char      block_name[255];
+};
+
+struct blockCreateCli {
+  char      volume[255];
+  char      volfileserver[255];
+  u_quad_t  size;
+  char      block_name[255];
+  string    block_hosts<>;
+};
 
-struct blockTrans {
-  int     exit;    /* exit code of the command */
-  string  out<>;   /* stdout of the command */
+struct blockResponse {
+  int       exit;       /* exit code of the command */
+  string    out<>;      /* json output */
+  u_quad_t  offset;     /* dentry d_name offset */
+  opaque    xdata<>;    /* future reserve */
 };
 
+program GLUSTER_BLOCK_CLI {
+  version GLUSTER_BLOCK_CLI_VERS {
+    blockResponse BLOCK_CREATE_CLI(blockCreateCli) = 1;
+  } = 1;
+} = 212153113; /* B2 L12 O15 C3 K11 C3 */
+
 program GLUSTER_BLOCK {
   version GLUSTER_BLOCK_VERS {
-    blockTrans BLOCK_EXEC(string) = 1;
+    blockResponse BLOCK_CREATE(blockCreate) = 1;
   } = 1;
 } = 21215311; /* B2 L12 O15 C3 K11 */