read and write request to curve: 1. The user initiates a request (fd=1, offset=0, length=4096). 2. The Client queries metadata from the MDS and stores the metadata locally. The request is converted converted to a chunk request (CopysetId=1, chunkId=5678, offset in chunk = 0, length in Chunk = 4096). If the currently segment written is not allocated, the client request the MDS to allocate segment. As =4096). 5. The Chunkserver completes the request and notifies the client that the request is completed. 6. At last, the Client notifies the user that the request is completed.Chunkserver processing

estVer。 3.遍历requestVer，根据每个request的offset找到inode中对应index的S3ChunkInfoList，根据S3ChunkInfoList构建s3Request，最后生成s3RequestVer。 4.遍历s3Re 接口读取数据。 questVer中request采用异步 5.等待所有的request返回，更新读缓存，获取返回数据填充readBuf。 ReleaseCache流程

much the lookup count should be decreased. * * Inodes with a non-zero lookup count may receive request from * the kernel even after calls to unlink, rmdir or (when * overwriting an existing file) affected© XXX Page 5 of 15 * inodes. * * Valid replies: * fuse_reply_none * * @param req request handle * @param ino the inode number * @param nlookup the number of lookups to forget */ void description of the * forget function). * * Valid replies: * fuse_reply_err * * @param req request handle * @param parent inode number of the parent directory * @param name to remove */ void

se->op.init(se->userdata, &se->conn); } // libfuse include/fuse_kernel.h // This is the first request sent by the kernel to the daemon. It is used to negotiate the protocol version and other filesystem unsigned want; /** * Maximum number of pending "background" requests. A * background request is any type of request for which the * total number is not limited by other means. As of kernel * 4.8, only are generated if * FUSE_CAP_ASYNC_DIO is enabled and userspace submits a large * direct I/O request. In this case the kernel will internally * split it up into multiple smaller requests and submit

ns Listener 获得一个socket fd后，创建通讯Socket。 SocketOptions关键字段: fd, on_edge_triggered_events18 例子：Request输入处理19 Channel创建Socket20 Channel远程调用的发起21 UCX ●NVIDIA Mellanox 开源项目 ●支持RDMA，TCP，Shared memory等 –完成连接的接受 –完成连接的创建 ●监视brpc::Socket类关闭文件句柄 ●连接以文件句柄表示43 连接管理器UcpCm ● 连接以文件句柄返回 –int Accept(ucp_conn_request_h req); –int Connect(const butil::EndPoint &peer); –UcpConnectionRef GetConnection(int fd1);44 UcpAcceptor ●处理收到的连接 SocketOptions options; –options.fd = get_or_create_ucp_cm()->Accept(conn_request);48 UcpConnection ●封装ucp_ep ●支持读写接口 – ssize_t Read(butil::IOBuf *out, size_t n); – ssize_t Write(butil::IOBuf

ead操作。 3.将read的offset，len和s3info可能交互的场景分别进行处理，分别获取要读取的每个S3ChunkInfo的offset len，封装到request中，具体可见代码的处理逻辑。 4.根据request进一步获取到s3 object去读取对象，将结果保存在response中。 5.最后根据所有的response将buff整合，返回给上层

way the file is opened. See fuse_file_info structure in for more details. If this request is answered with an error code of ENOSYS and FUSE_CAP_NO_OPEN_SUPPORT is set in fuse_conn_info.capable being sent to the filesystem process. Valid replies: fuse_reply_open fuse_reply_err Parameters req request handle ino the inode number fi file information© XXX Page 7 of 23 open flags 在curvefs上的测试 在现在的

• 读cache流程 • 写cache流程基于inode cache优化 • bpf程序类型 BPF_PROG_TYPE_EXTFUSE • Hook点及⽅法 • fuse_request_send • FUSE_LOOKUP / FUSE_GETATTR / FUSE_SETATTR / • map 结构 • dentry map BPF_MAP_TYPE_HASH

client，元数据服务器接收到请求后，根据fsId查找到对应的文件系统的空间分配器后，将空间分配/回收的任务交给这个分配器进行处理，处理完成后，返回RPC。 空间分配器相关的RPC接口，及request/response定义如下。与 里的定义基本一致。 CurveFS Client 概要设计（已实现）#%E6%8E%A5%E5%8F%A3%E9%9C%80%E6%B1%82 syntax="proto2";

实践 Robotframework  支持python关键字，灵活定义测试  完善的测试报告  完美兼容Jenkins ci  丰富的第三方库（ssh, paramiko, request等） 用例设计原则  无需绑定特定环境，“随意拉起”  配置化（测试环境、测试负载定义）  控制用例时间（考虑一些折中方案）  Case独立性  Case通用性（兼顾curve、ceph等）