diff --git a/blockstore.h b/blockstore.h
index 0dd85935..0adc19d0 100644
--- a/blockstore.h
+++ b/blockstore.h
@@ -266,10 +266,12 @@ class blockstore
     std::list<blockstore_operation*> submit_queue; // FIXME: funny thing is that vector is better here
     std::vector<obj_ver_id> unsynced_big_writes, unsynced_small_writes;
     std::list<blockstore_operation*> in_progress_syncs; // ...and probably here, too
-    uint64_t block_count;
     allocator *data_alloc = NULL;
     uint8_t *zero_object;
 
+    uint64_t block_count;
+    uint32_t block_order, block_size;
+
     int meta_fd;
     int data_fd;
 
@@ -359,7 +361,10 @@ public:
     // Submission
     void enqueue_op(blockstore_operation *op);
 
-    // FIXME public morozov
+    // Unstable writes are added here (map of object_id -> version)
     std::map<object_id, uint64_t> unstable_writes;
-    uint32_t block_order, block_size;
+
+    inline uint32_t get_block_size() { return block_size; }
+    inline uint32_t get_block_order() { return block_order; }
+    inline uint64_t get_block_count() { return block_count; }
 };
diff --git a/fio_engine.cpp b/fio_engine.cpp
index a41c8d73..16ec5ca1 100644
--- a/fio_engine.cpp
+++ b/fio_engine.cpp
@@ -178,7 +178,7 @@ static enum fio_q_status bs_queue(struct thread_data *td, struct io_u *io)
     io->engine_data = bsd;
 
     if (io->ddir == DDIR_WRITE || io->ddir == DDIR_READ)
-        assert(io->xfer_buflen <= bsd->bs->block_size);
+        assert(io->xfer_buflen <= bsd->bs->get_block_size());
 
     blockstore_operation *op = new blockstore_operation;
     op->callback = NULL;
@@ -190,9 +190,9 @@ static enum fio_q_status bs_queue(struct thread_data *td, struct io_u *io)
         op->buf = io->xfer_buf;
         op->oid = {
             .inode = 1,
-            .stripe = io->offset >> bsd->bs->block_order,
+            .stripe = io->offset >> bsd->bs->get_block_order(),
         };
-        op->offset = io->offset % bsd->bs->block_size;
+        op->offset = io->offset % bsd->bs->get_block_size();
         op->len = io->xfer_buflen;
         op->callback = [io, n](blockstore_operation *op)
         {
@@ -211,9 +211,9 @@ static enum fio_q_status bs_queue(struct thread_data *td, struct io_u *io)
         op->buf = io->xfer_buf;
         op->oid = {
             .inode = 1,
-            .stripe = io->offset >> bsd->bs->block_order,
+            .stripe = io->offset >> bsd->bs->get_block_order(),
         };
-        op->offset = io->offset % bsd->bs->block_size;
+        op->offset = io->offset % bsd->bs->get_block_size();
         op->len = io->xfer_buflen;
         op->callback = [io, n](blockstore_operation *op)
         {