From 230a26772e8091df08028aa1dc1b03ae8c58f0e1 Mon Sep 17 00:00:00 2001
From: Vitaliy Filippov <vitalif@yourcmc.ru>
Date: Tue, 3 Mar 2026 02:09:16 +0300
Subject: [PATCH] Do not allow data_block_size < 8*bitmap_granularity

---
 src/blockstore/blockstore_disk.cpp | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/src/blockstore/blockstore_disk.cpp b/src/blockstore/blockstore_disk.cpp
index a1804947..8152264f 100644
--- a/src/blockstore/blockstore_disk.cpp
+++ b/src/blockstore/blockstore_disk.cpp
@@ -173,9 +173,7 @@ void blockstore_disk_t::parse_config(std::map<std::string, std::string> & config
     }
     if (data_block_size / bitmap_granularity < 8)
     {
-        fprintf(stderr, "Warning: block_size (%u) / bitmap_granularity (%u) = %u bits. "
-            "Consider using larger block_size or bitmap_granularity for better performance.\n",
-            data_block_size, bitmap_granularity, data_block_size / bitmap_granularity);
+        throw std::runtime_error("Data block size must be at least bitmap_granularity*8");
     }
     if (!data_csum_type)
     {