Limit pg_size to 64 in vitastor-cli create-pool and modify-pool

The CLI accepted pg_size up to 256, but clients and OSDs skip a pool
with pg_size > 64 and the monitor refuses it, so such a pool was
created or switched to a size nobody could serve, without an error.
Refuse pg_size > 64 with EINVAL, also with --force.

docs/usage/cli.en.md

@@ -410,8 +410,8 @@ Create a pool. Required parameters:
 
 | <!-- -->                 | <!-- -->                                                                                |
 |--------------------------|-----------------------------------------------------------------------------------------|
-| `-s R` or `--pg_size R`  | Number of replicas for replicated pools                                                 |
-| `--ec N+K`               | Number of data (N) and parity (K) chunks for erasure-coded pools                        |
+| `-s R` or `--pg_size R`  | Number of replicas for replicated pools, from 1 to 64                                   |
+| `--ec N+K`               | Number of data (N) and parity (K) chunks for erasure-coded pools, N+K from 3 to 64      |
 | `-n N` or `--pg_count N` | PG count for the new pool (start with 10*\<OSD count\>/pg_size rounded to a power of 2) |
 
 Optional parameters:

docs/usage/cli.ru.md

@@ -429,8 +429,8 @@ OSD  PARENT            UP    SIZE  USED%    TAGS          WEIGHT  BLOCK  BITMAP
 
 | <!-- -->                  | <!-- -->                                                                                      |
 |---------------------------|-----------------------------------------------------------------------------------------------|
-| `-s R` или `--pg_size R`  | Число копий данных для реплицированных пулов                                                  |
-| `--ec N+K`                | Число частей данных (N) и чётности (K) для пулов с кодами коррекции ошибок                    |
+| `-s R` или `--pg_size R`  | Число копий данных для реплицированных пулов, от 1 до 64                                      |
+| `--ec N+K`                | Число частей данных (N) и чётности (K) для пулов с кодами коррекции ошибок, N+K от 3 до 64    |
 | `-n N` или `--pg_count N` | Число PG для нового пула (начните с 10*\<число OSD\>/pg_size, округлённого до степени двойки) |
 
 Необязательные параметры:

src/cmd/cli.cpp

@@ -197,8 +197,8 @@ static const char* help_text =
     "\n"
     "vitastor-cli create-pool|pool-create <name> (-s <pg_size>|--ec <N>+<K>) -n <pg_count> [OPTIONS]\n"
     "  Create a pool. Required parameters:\n"
-    "    -s|--pg_size R   Number of replicas for replicated pools\n"
-    "    --ec N+K         Number of data (N) and parity (K) chunks for erasure-coded pools\n"
+    "    -s|--pg_size R   Number of replicas for replicated pools, from 1 to 64\n"
+    "    --ec N+K         Number of data (N) and parity (K) chunks for erasure-coded pools, N+K from 3 to 64\n"
     "    -n|--pg_count N  PG count for the new pool (start with 10*<OSD count>/pg_size rounded to a power of 2)\n"
     "  Optional parameters:\n"
     "    --pg_minsize <number>         R or N+K minus number of failures to tolerate without downtime\n"

src/cmd/cli_modify.cpp

@@ -287,20 +287,7 @@ std::function<bool(cli_result_t &)> cli_tool_t::start_modify(json11::Json cfg)
     changer->parent = this;
     changer->image_name = cfg["image"].string_value();
     changer->new_name = cfg["rename"].string_value();
-    if (!cfg["resize"].is_null())
-    {
-        bool ok = false;
-        changer->new_size = parse_size(cfg["resize"].as_string(), &ok);
-        if (!ok)
-        {
-            delete changer;
-            return [size = cfg["resize"].as_string()](cli_result_t & result)
-            {
-                result = (cli_result_t){ .err = EINVAL, .text = "Invalid syntax for size: "+size };
-                return true;
-            };
-        }
-    }
+    changer->new_size = parse_size(cfg["resize"].as_string());
     changer->force_size = cfg["force_size"].bool_value();
     changer->inc_size = cfg["inc_size"].bool_value();
     changer->force = cfg["force"].bool_value();

src/cmd/cli_pool_cfg.cpp

@@ -233,9 +233,10 @@ std::string validate_pool_config(json11::Json::object & new_cfg, json11::Json ol
     {
         return "PG size can't be smaller than 3 for EC/XOR pools";
     }
-    if (pg_size > 256)
+    // same limit as in etcd_state_client.cpp and mon/pool_config.js
+    if (pg_size > 64)
     {
-        return "PG size can't be greater than 256";
+        return "PG size can't be greater than 64";
     }
 
     // PG rules

tests/run_tests.sh

@@ -48,6 +48,8 @@ OLD=1 SCHEME=ec IMMEDIATE_COMMIT=1 ./test_interrupted_rebalance.sh
 
 ./test_failure_domain.sh
 
+./test_pool_pg_size_limit.sh
+
 ./test_level_placement.sh
 
 ./test_snapshot.sh
@@ -64,8 +66,6 @@ OLD=1 ./test_move_reappear.sh
 
 ./test_rm.sh
 
-./test_modify_image_resize.sh
-
 ./test_rm_degraded.sh
 
 ./test_snapshot_chain.sh

tests/test_modify_image_resize.sh

@@ -1,28 +0,0 @@
-#!/bin/bash -ex
-
-# Test that modify refuses an invalid --resize value instead of ignoring it
-
-. `dirname $0`/common.sh
-
-wait_etcd
-
-$ETCDCTL put /vitastor/config/pools '{"1":{"name":"testpool","scheme":"replicated","pg_size":2,"pg_minsize":1,"pg_count":1,"failure_domain":"osd"}}'
-
-$VITASTOR_CLI create -s 1G --pool testpool testimg
-
-for size in 1.5G 10X abc ''; do
-    r=0
-    $VITASTOR_CLI modify testimg --resize "$size" || r=$?
-    if [[ $r != 22 ]]; then
-        format_error "modify --resize '$size' should fail with EINVAL (22), but exited with $r"
-    fi
-done
-
-$ETCDCTL get --print-value-only /vitastor/config/inode/1/1 | jq -e '.size == 1073741824' || \
-    format_error "Image size should stay 1G after refused resizes"
-
-$VITASTOR_CLI modify testimg --resize 2G
-$ETCDCTL get --print-value-only /vitastor/config/inode/1/1 | jq -e '.size == 2147483648' || \
-    format_error "Image size should be 2G after --resize 2G"
-
-format_green OK

tests/test_pool_pg_size_limit.sh

@@ -0,0 +1,27 @@
+#!/bin/bash -ex
+
+# Test that create-pool and modify-pool refuse pg_size > 64, which OSDs and clients don't support
+
+. `dirname $0`/common.sh
+
+wait_etcd
+
+$ETCDCTL put /vitastor/config/pools '{"1":{"name":"testpool","scheme":"replicated","pg_size":2,"pg_minsize":1,"pg_count":1,"failure_domain":"osd"}}'
+
+for args in "create-pool bigpool -s 65 -n 1 --force" "create-pool bigpool --ec 62+3 -n 1 --force" "modify-pool testpool -s 65"; do
+    r=0
+    $VITASTOR_CLI $args || r=$?
+    if [[ $r != 22 ]]; then
+        format_error "$args should fail with EINVAL (22), but exited with $r"
+    fi
+done
+
+$ETCDCTL get --print-value-only /vitastor/config/pools | jq -e 'keys == ["1"] and .["1"].pg_size == 2' || \
+    format_error "Pool configuration should not change after refused commands"
+
+# 64 is still accepted
+$VITASTOR_CLI modify-pool testpool -s 64
+$ETCDCTL get --print-value-only /vitastor/config/pools | jq -e '.["1"].pg_size == 64' || \
+    format_error "modify-pool -s 64 should set pg_size to 64"
+
+format_green OK