glusterd/thin-arbiter: Thin-arbiter integration with GD1

gluster volume create <VOLNAME> replica 2 thin-arbiter 1 <host1>:<brick1> <host2>:<brick2>
<thin-arbiter-host>:<path-to-store-replica-id-file> [force]

The changes have been made in a way that the last brick in the bricks list
will be treated as the thin-arbiter.
GD1 will be manipulated to consider replica count to be as 2 and continue creating the
volume like any other replica 2 volume but since thin-arbiter volumes need ta-brick
client xlator entries for each subvolume in fuse volfile, volfile generation is
modified in a way to inject these entries seperately in the volfile for every subvolume.

Few more additions -
1- Save the volinfo with new fields ta_bricks list and thin_arbiter_count.
2- Introduce a new option client.ta-brick-port to add remote-port to ta-brick xlator entry
   in fuse volfiles. The option can be set using the following CLI syntax -
   gluster volume set <VOLNAME> client.ta-brick-port <PORTNO.>
3- Volume Info will contain a Thin-Arbiter-path entry to distinguish
   from other replicate volumes.

Change-Id: Ib434e2313b29716f32476c6c211d282c4ef39406
Updates #687
Signed-off-by: Vishal Pandey <vpandey@redhat.com>

1 files changed, 15 insertions, 0 deletions

diff --git a/cli/src/cli-rpc-ops.c b/cli/src/cli-rpc-ops.c
index 16d5f73983f..35985ab44c6 100644
--- a/cli/src/cli-rpc-ops.c
+++ b/cli/src/cli-rpc-ops.c
@@ -723,10 +723,12 @@ gf_cli_get_volume_cbk(struct rpc_req *req, struct iovec *iov, int count,
     int32_t redundancy_count = 0;
     int32_t arbiter_count = 0;
     int32_t snap_count = 0;
+    int32_t thin_arbiter_count = 0;
     int32_t vol_type = 0;
     int32_t transport = 0;
     char *volume_id_str = NULL;
     char *volname = NULL;
+    char *ta_brick = NULL;
     dict_t *dict = NULL;
     cli_local_t *local = NULL;
     char key[1024] = {0};
@@ -903,6 +905,11 @@ xml_output:
         if (ret)
             goto out;
 
+        snprintf(key, 256, "volume%d.thin_arbiter_count", i);
+        ret = dict_get_int32(dict, key, &thin_arbiter_count);
+        if (ret)
+            goto out;
+
         // Distributed (stripe/replicate/stripe-replica) setups
         vol_type = get_vol_type(type, dist_count, brick_count);
 
@@ -929,6 +936,14 @@ xml_output:
         if (ret)
             goto out;
 
+        if (thin_arbiter_count) {
+            snprintf(key, 1024, "volume%d.thin_arbiter_brick", i);
+            ret = dict_get_str(dict, key, &ta_brick);
+            if (ret)
+                goto out;
+            cli_out("Thin-arbiter-path: %s", ta_brick);
+        }
+
         snprintf(key, 256, "volume%d.opt_count", i);
         ret = dict_get_int32(dict, key, &opt_count);
         if (ret)