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, 50 insertions, 2 deletions

diff --git a/cli/src/cli-cmd-parser.c b/cli/src/cli-cmd-parser.c
index 4181e6c8162..f7ee29a10c7 100644
--- a/cli/src/cli-cmd-parser.c
+++ b/cli/src/cli-cmd-parser.c
@@ -159,13 +159,21 @@ cli_cmd_volume_create_parse (const char **words, int wordcount, dict_t **options
         int32_t index = 0;
         char    *bricks = NULL;
         int32_t brick_count = 0;
-        char    *opwords[] = { "replica", "stripe", "transport", NULL };
+        char    *opwords[] = { "replica", "stripe", "transport",
+#ifdef HAVE_BD_XLATOR
+                                "device",
+#endif
+                                NULL };
+
         char    *invalid_volnames[] = {"volume", "type", "subvolumes", "option",
                                       "end-volume", "all", NULL};
         char    *w = NULL;
         int      op_count = 0;
         int32_t  replica_count = 1;
         int32_t  stripe_count = 1;
+#ifdef HAVE_BD_XLATOR
+        char     *dev_type = NULL;
+#endif
 
         GF_ASSERT (words);
         GF_ASSERT (options);
@@ -300,7 +308,26 @@ cli_cmd_volume_create_parse (const char **words, int wordcount, dict_t **options
                                 goto out;
                         }
                         index += 2;
-                } else {
+                }
+#ifdef HAVE_BD_XLATOR
+                else if ((strcmp (w, "device")) == 0) {
+                        if (dev_type) {
+                                cli_err ("'device' option given more"
+                                         " than one time");
+                                goto out;
+                        }
+                        if ((strcasecmp (words[index+1], "vg") == 0)) {
+                                dev_type = gf_strdup ("vg");
+                        } else {
+                                gf_log ("", GF_LOG_ERROR, "incorrect"
+                                        " device type specified");
+                                ret = -1;
+                                goto out;
+                        }
+                        index += 2;
+                }
+#endif
+                else {
                         GF_ASSERT (!"opword mismatch");
                         ret = -1;
                         goto out;
@@ -336,6 +363,19 @@ cli_cmd_volume_create_parse (const char **words, int wordcount, dict_t **options
                 goto out;
         }
 
+        /* BD xlator does not support multiple bricks */
+#ifdef HAVE_BD_XLATOR
+        if (brick_count > 1 && dev_type) {
+                cli_err ("Block Device backend volume does not support multiple"
+                         " bricks");
+                gf_log ("", GF_LOG_ERROR,
+                          "Block Device backend volumer does not support multiple"
+                        " bricks");
+                ret = -1;
+                goto out;
+        }
+#endif
+
         if (brick_count % sub_count) {
                 if (type == GF_CLUSTER_TYPE_STRIPE)
                         cli_err ("number of bricks is not a multiple of "
@@ -369,6 +409,14 @@ cli_cmd_volume_create_parse (const char **words, int wordcount, dict_t **options
         if (ret)
                 goto out;
 
+#ifdef HAVE_BD_XLATOR
+        if (dev_type) {
+                ret = dict_set_dynstr (dict, "device", dev_type);
+                if (ret)
+                        goto out;
+        }
+#endif
+
         ret = dict_set_int32 (dict, "count", brick_count);
         if (ret)
                 goto out;