BD Backend: Volume creation support

A new parameter type is added to volume create command. To use BD xlator
one has to specify following argument in addition to normal volume
create

device vg brick:<VG-NAME>

for example,
$ gluster volume create lv_volume device vg host:/vg1

Changes from previous version

* New type 'backend' added to volinfo structure to differentiate between
  posix and bd xlator
* Most of the volume related commands are updated to handle BD xlator,
  like add-brick, heal-brick etc refuse to work when volume is BD xlator
  type
* Only one VG (ie brick) can be specified for BD xlator during volume
  creation
* volume info shows VG info if its of type BD xlator

BUG: 805138
Change-Id: I0ff90aca04840c71f364fabb0ab43ce33f9278ce
Signed-off-by: M. Mohan Kumar <mohan@in.ibm.com>
Reviewed-on: http://review.gluster.org/3717
Reviewed-by: Vijay Bellur <vbellur@redhat.com>
Tested-by: Vijay Bellur <vbellur@redhat.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/xlators/mgmt/glusterd/src/glusterd-handler.c b/xlators/mgmt/glusterd/src/glusterd-handler.c
index cec94f89f..9433436d0 100644
--- a/xlators/mgmt/glusterd/src/glusterd-handler.c
+++ b/xlators/mgmt/glusterd/src/glusterd-handler.c
@@ -370,6 +370,13 @@ glusterd_add_volume_detail_to_dict (glusterd_volinfo_t *volinfo,
         if (ret)
                 goto out;
 
+#ifdef HAVE_BD_XLATOR
+        snprintf (key, 256, "volume%d.backend", count);
+        ret = dict_set_int32 (volumes, key, volinfo->backend);
+        if (ret)
+                goto out;
+#endif
+
         list_for_each_entry (brickinfo, &volinfo->bricks, brick_list) {
                 char    brick[1024] = {0,};
                 snprintf (key, 256, "volume%d.brick%d", count, i);