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>
(cherry picked from commit f960a018f938c70ea3d7f031611cdc5a6b9955b1)

diff --git a/src/os/bluestore/BlueStore.cc b/src/os/bluestore/BlueStore.cc
index 7a64b1c0d28eeb486229a1d306ad4c49e68575c9..1ccfbac9a21fc7609641cd3f8a41cf2462615889 100644 (file)
--- a/src/os/bluestore/BlueStore.cc
+++ b/src/os/bluestore/BlueStore.cc
@@ -13235,7 +13235,10 @@ 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;
 }