os/bluestore: add sanity check when try to rm_buffer

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

diff --git a/src/os/bluestore/BlueStore.h b/src/os/bluestore/BlueStore.h
index bbe33083e153843785c7df75c235af9ab4d48736..b2b3d3373a4d77294a61e94ec633e00e403f7f5f 100644 (file)
--- a/src/os/bluestore/BlueStore.h
+++ b/src/os/bluestore/BlueStore.h
@@ -223,6 +223,7 @@ public:
     }
     void _rm_buffer(map<uint64_t,std::unique_ptr<Buffer>>::iterator p) {
       cache->_audit_lru("_rm_buffer start");
+      assert(cache->buffer_size >= p->second->length);
       cache->buffer_size -= p->second->length;
       cache->buffer_lru.erase(cache->buffer_lru.iterator_to(*p->second));
       if (p->second->is_writing()) {