mon: require pgnum in 'ceph osd pool create <poolname> <pgnum> [<pgp_num>]' command

The default of 8 is virtually never the right answer.  Require the initial
pg count to be explicitly provided.

Signed-off-by: Sage Weil <sage@inktank.com>

doc/cluster-ops/control.rst

@@ -236,7 +236,7 @@ Creates/deletes a snapshot of a pool. ::
 
 Creates/deletes/renames a storage pool. ::
 
-	ceph osd pool create {pool-name} [pg_num [pgp_num]]
+	ceph osd pool create {pool-name} pg_num [pgp_num]
 	ceph osd pool delete {pool-name}
    ceph osd pool rename {old-name} {new-name}
 

doc/cluster-ops/pools.rst

@@ -52,7 +52,7 @@ Create a Pool
 
 To create a pool, execute:: 
 
-	ceph osd pool create {pool-name} [{pg-num}] [{pgp-num}]
+	ceph osd pool create {pool-name} {pg-num} [{pgp-num}]
 
 Where: 
 

doc/rbd/rbd-openstack.rst

@@ -61,8 +61,8 @@ By default, Ceph block devices use the ``rbd`` pool. You may use any available
 pool. We recommend creating a pool for Nova/Cinder and a pool for Glance. Ensure
 your Ceph cluster is running, then create the pools. ::
 
-    ceph osd pool create volumes
-    ceph osd pool create images
+    ceph osd pool create volumes 128
+    ceph osd pool create images 128
 
 See `Create a Pool`_ for detail on specifying the number of placement groups for
 your pools, and `Placement Groups`_ for details on the number of placement

qa/workunits/kclient/file_layout.sh

@@ -51,7 +51,7 @@ sudo ls /sys/kernel/debug/ceph
 sudo ls /sys/kernel/debug/ceph/\* || true
 sudo bash -c 'ls /sys/kernel/debug/ceph/*' || true
 sudo bash -c 'cat /sys/kernel/debug/ceph/*/mdsmap' > temp
-ceph osd pool create newpool || true
+ceph osd pool create newpool 2 || true
 ceph mds add_data_pool 3 || true
 sudo bash -c 'cat /sys/kernel/debug/ceph/*/mdsmap' > temp2
 while diff -q temp2 temp

qa/workunits/mon/pool_ops.sh

@@ -4,16 +4,14 @@ set -e
 
 ceph osd pool create foo 123 123
 ceph osd pool create fooo 123
-ceph osd pool create foooo
 
-ceph osd pool create foo  # idempotent
+ceph osd pool create foo 123 # idempotent
 
 ceph osd pool delete foo
 ceph osd pool delete foo
 ceph osd pool delete fuggg
 
 ceph osd pool delete fooo
-ceph osd pool delete foooo
 
 echo OK
 

src/mon/OSDMonitor.cc

@@ -2561,27 +2561,30 @@ bool OSDMonitor::prepare_command(MMonCommand *m)
 	  }
 	}
       }
-      else if (m->cmd[2] == "create" && m->cmd.size() >= 4) {
+      else if (m->cmd[2] == "create" && m->cmd.size() >= 3) {
+	if (m->cmd.size() < 5) {
+	  ss << "usage: osd pool create <poolname> <pg_num> [pgp_num]";
+	  err = -EINVAL;
+	  goto out;
+	}
         int pg_num = 0;
         int pgp_num = 0;
-        if (m->cmd.size() > 4) { // try to parse out pg_num and pgp_num
-          const char *start = m->cmd[4].c_str();
-          char *end = (char*)start;
-          pgp_num = pg_num = strtol(start, &end, 10);
-          if (*end != '\0') { // failed to parse
-            err = -EINVAL;
-            ss << "usage: osd pool create <poolname> [pg_num [pgp_num]]";
-            goto out;
-          } else if (m->cmd.size() > 5) { // check for pgp_num too
-            start = m->cmd[5].c_str();
-            end = (char *)start;
-            pgp_num = strtol(start, &end, 10);
-            if (*end != '\0') { // failed to parse
-              err = -EINVAL;
-              ss << "usage: osd pool create <poolname> [pg_num [pgp_num]]";
-              goto out;
-            }
-          }
+	const char *start = m->cmd[4].c_str();
+	char *end = (char*)start;
+	pgp_num = pg_num = strtol(start, &end, 10);
+	if (*end != '\0') { // failed to parse
+	  err = -EINVAL;
+	  ss << "usage: osd pool create <poolname> <pg_num> [pgp_num]";
+	  goto out;
+	} else if (m->cmd.size() > 5) { // check for pgp_num too
+	  start = m->cmd[5].c_str();
+	  end = (char *)start;
+	  pgp_num = strtol(start, &end, 10);
+	  if (*end != '\0') { // failed to parse
+	    err = -EINVAL;
+	    ss << "usage: osd pool create <poolname> <pg_num> [pgp_num]";
+	    goto out;
+	  }
         }
 
 	if (osdmap.name_pool.count(m->cmd[3])) {

src/test/cli/ceph/help.t

@@ -53,7 +53,7 @@
     ceph osd blacklist rm <address>[:source_port]
     ceph osd pool mksnap <pool> <snapname>
     ceph osd pool rmsnap <pool> <snapname>
-    ceph osd pool create <pool> [<pg_num> [<pgp_num>]]
+    ceph osd pool create <pool> <pg_num> [<pgp_num>]
     ceph osd pool delete <pool>
     ceph osd pool rename <pool> <new pool name>
     ceph osd pool set <pool> <field> <value>

src/tools/ceph.cc

@@ -96,7 +96,7 @@ static void usage()
   cout << "  ceph osd blacklist rm <address>[:source_port]\n";
   cout << "  ceph osd pool mksnap <pool> <snapname>\n";
   cout << "  ceph osd pool rmsnap <pool> <snapname>\n";
-  cout << "  ceph osd pool create <pool> [<pg_num> [<pgp_num>]]\n";
+  cout << "  ceph osd pool create <pool> <pg_num> [<pgp_num>]\n";
   cout << "  ceph osd pool delete <pool>\n";
   cout << "  ceph osd pool rename <pool> <new pool name>\n";
   cout << "  ceph osd pool set <pool> <field> <value>\n";