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, 39 insertions, 13 deletions

diff --git a/xlators/mgmt/glusterd/src/glusterd-volgen.c b/xlators/mgmt/glusterd/src/glusterd-volgen.c
index 76172dd9bce..f3de2feed52 100644
--- a/xlators/mgmt/glusterd/src/glusterd-volgen.c
+++ b/xlators/mgmt/glusterd/src/glusterd-volgen.c
@@ -1574,6 +1574,8 @@ server_graph_builder (volgen_graph_t *graph, glusterd_volinfo_t *volinfo,
         char     *password                = NULL;
         char     index_basepath[PATH_MAX] = {0};
         char     key[1024]                = {0};
+        char     *vgname                  = NULL;
+        char     *vg                      = NULL;
 
         path = param;
         volname = volinfo->volname;
@@ -1591,23 +1593,47 @@ server_graph_builder (volgen_graph_t *graph, glusterd_volinfo_t *volinfo,
                 }
         }
 
-        xl = volgen_graph_add (graph, "storage/posix", volname);
-        if (!xl)
-                return -1;
+        if (volinfo->backend == GD_VOL_BK_BD) {
+                xl = volgen_graph_add (graph, "storage/bd_map", volname);
+                if (!xl)
+                        return -1;
 
-        ret = xlator_set_option (xl, "directory", path);
-        if (ret)
-                return -1;
+                ret = xlator_set_option (xl, "device", "vg");
+                if (ret)
+                        return -1;
 
-        ret = xlator_set_option (xl, "volume-id",
-                                 uuid_utoa (volinfo->volume_id));
-        if (ret)
-                return -1;
+                vg = gf_strdup (path);
+                vgname = strrchr (vg, '/');
+                if (strchr(vg, '/') != vgname) {
+                        gf_log ("glusterd", GF_LOG_ERROR,
+                                  "invalid vg specified %s", path);
+                        GF_FREE (vg);
+                        goto out;
+                }
+                vgname++;
+                ret = xlator_set_option (xl, "export", vgname);
+                GF_FREE (vg);
+                if (ret)
+                        return -1;
+        } else {
+                xl = volgen_graph_add (graph, "storage/posix", volname);
+                if (!xl)
+                        return -1;
 
-        ret = check_and_add_debug_xl (graph, set_dict, volname, "posix");
-        if (ret)
-                return -1;
+                ret = xlator_set_option (xl, "directory", path);
+                if (ret)
+                        return -1;
 
+                ret = xlator_set_option (xl, "volume-id",
+                                 uuid_utoa (volinfo->volume_id));
+                if (ret)
+                        return -1;
+
+                ret = check_and_add_debug_xl (graph, set_dict, volname,
+                                                "posix");
+                if (ret)
+                        return -1;
+        }
         xl = volgen_graph_add (graph, "features/access-control", volname);
         if (!xl)
                 return -1;