[NaCl SDK] nacl_io: Fix FuseFs.{read,write}

native_client_sdk/src/libraries/nacl_io/fusefs/fuse_fs.cc

Index: native_client_sdk/src/libraries/nacl_io/fusefs/fuse_fs.cc
diff --git a/native_client_sdk/src/libraries/nacl_io/fusefs/fuse_fs.cc b/native_client_sdk/src/libraries/nacl_io/fusefs/fuse_fs.cc
index fdf74be4a6e2be24f93dfae0ad839f2c150dfcf5..5763d86672ed02dd296fdafffd949e42b2f70d59 100644
--- a/native_client_sdk/src/libraries/nacl_io/fusefs/fuse_fs.cc
+++ b/native_client_sdk/src/libraries/nacl_io/fusefs/fuse_fs.cc
@@ -341,13 +341,11 @@ Error FileFuseFsNode::Read(const HandleAttr& attr,
   if (result < 0)
     return -result;
 
-  // Fuse docs say that a read() call will always completely fill the buffer
-  // (padding with zeroes) unless the direct_io filesystem flag is set.
   // TODO(binji): support the direct_io flag
   if (static_cast<size_t>(result) < count)
     memset(&cbuf[result], 0, count - result);
 
-  *out_bytes = count;
+  *out_bytes = result;
   return 0;
 }
 
@@ -365,9 +363,6 @@ Error FileFuseFsNode::Write(const HandleAttr& attr,
   if (result < 0)
     return -result;
 
-  // Fuse docs say that a write() call will always write the entire buffer
-  // unless the direct_io filesystem flag is set.
-  // TODO(binji): What should we do if the user breaks this contract? Warn?
   // TODO(binji): support the direct_io flag
   *out_bytes = result;
   return 0;