os/bluestore: add sanity check for get_free() method

Signed-off-by: xie xingguo <xie.xingguo@zte.com.cn>

diff --git a/src/os/bluestore/BitMapAllocator.cc b/src/os/bluestore/BitMapAllocator.cc
index 04f5dc70025c05529d302bfda5bfc7ef0f36edc8..d42093e79b1ff7099dfb6189fb4bb04dca740949 100644 (file)
--- a/src/os/bluestore/BitMapAllocator.cc
+++ b/src/os/bluestore/BitMapAllocator.cc
@@ -152,6 +152,7 @@ int BitMapAllocator::release(
 
 uint64_t BitMapAllocator::get_free()
 {
+  assert(m_bit_alloc->size() >= m_bit_alloc->get_used_blocks());
   return ((
     m_bit_alloc->size() - m_bit_alloc->get_used_blocks()) *
     m_block_size);