KernelDevice: put a guard for sync read

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

diff --git a/src/os/bluestore/KernelDevice.cc b/src/os/bluestore/KernelDevice.cc
index 173926b567aeea46c76860f087ab6c1973177d19..f0ef28c6f09155a938d26a40dd0e717a23bfeef7 100644 (file)
--- a/src/os/bluestore/KernelDevice.cc
+++ b/src/os/bluestore/KernelDevice.cc
@@ -466,6 +466,7 @@ int KernelDevice::read(uint64_t off, uint64_t len, bufferlist *pbl,
     r = -errno;
     goto out;
   }
+  assert((uint64_t)r == len);
   pbl->clear();
   pbl->push_back(p);