os/bluestore: drop redundant boundary check

As we have done the sanity check ahead.

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

diff --git a/src/os/bluestore/BlueStore.cc b/src/os/bluestore/BlueStore.cc
index 11ecbf5d35ca29a98446265caa78159d79459671..78c0b5ea7371c80584a1bfc45fbe49868e7b15bd 100644 (file)
--- a/src/os/bluestore/BlueStore.cc
+++ b/src/os/bluestore/BlueStore.cc
@@ -549,10 +549,7 @@ void BlueStore::Cache::trim(
     return;
   }
 
-  uint64_t need_to_free = 0;
-  if (current > target_bytes) {
-    need_to_free = current - target_bytes;
-  }
+  uint64_t need_to_free = current - target_bytes;
   uint64_t free_buffer = 0;
   uint64_t free_meta = 0;
   if (current_buffer > target_buffer) {