os/bluestore: do not use 'unused' bitmap if makes no sense.

The processing logic which relies on 'unused' bitmap makes sense for
bluestore setup where min alloc size is different from device block
size. Now omitting if that's not true.

Signed-off-by: Igor Fedotov <ifedotov@suse.com>

diff --git a/src/os/bluestore/BlueStore.cc b/src/os/bluestore/BlueStore.cc
index efa7091591b7406a531c7f990844b76261678499..24c693da146ba9507d3d6f7adc82a0c8a40a6bcb 100644 (file)
--- a/src/os/bluestore/BlueStore.cc
+++ b/src/os/bluestore/BlueStore.cc
@@ -13181,7 +13181,10 @@ void BlueStore::_do_write_small(
   uint64_t b_off0 = b_off;
   _pad_zeros(&bl, &b_off0, block_size);
   o->extent_map.punch_hole(c, offset, length, &wctx->old_extents);
-  wctx->write(offset, b, alloc_len, b_off0, bl, b_off, length, true, true);
+  wctx->write(offset, b, alloc_len, b_off0, bl, b_off, length,
+    min_alloc_size != block_size, // use 'unused' bitmap when alloc granularity
+                                  // doesn't match disk one only
+    true);
 
   return;
 }