(indicating that reliably O_APPEND is not available). Filesystem may store an arbitrary file handle (pointer, index, etc) in fi->fh, and use this in other all other file operations (read, write, flush, release 。© XXX Page 22 of 23 // chubaofs writeflush func cfs_write(id C.int64_t, fd C.int, buf unsafe.Pointer, size C.size_t, off C.off_t) C.ssize_t { ... var wait bool if f.flags&uint32(C.O_DIRECT) != 0

to file /foo/bar in CurveBS 2. The address space of the block device /dev/sda maps to chunks of file in the system. For example, chunk1 corresponds to the address space of 0 to 4MB in /dev/sda, and and chunk2 corresponds to the address space of 4 to 8MB in /dev/sda. The size of chunk can be configured 3. Each file (/foo/bar) contains chunks scattered all over the storage nodes. ChunkServer structure is used to store user data, and user space data is transferred through reference of data address, avoiding user space data copy.

Curve cannot be achieved without the support and participation of community contributors. Project address https://github.com/opencurve/curve Release cycle: a major release every six months, and a minor

将conf中blockSize，chunkSize，metaServer和allocateServer ip保存在S3ClientAdaptor中 2.将conf中的S3相关信息：保罗ak，sk，s3address，bucketname等透传给S3Adapter模块。这里要注意，S3Adapter为原来curve块存储就有的模块，负责将快照数据上传到S3，这里我们对于s3的操作主要复用了这 个模块。该模块