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 f4181b6c754a48eadcd78ac3d0ffdabf5bd94366..f8c6eeea83789e9251f9a8d8a2b4d9332e3e6594 100644 (file)
--- a/src/os/bluestore/BlueStore.cc
+++ b/src/os/bluestore/BlueStore.cc
@@ -12399,7 +12399,10 @@ 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;
 }