Hello, I setup samba server in upstream and mount it in local with cache=none,vers=3.11. Then test the Direct/IO function like this: fd=open(fname, O_DIRECT | O_RDWR | O_CREAT, 0666)) lseek(fd, 0, SEEK_SET); read(fd, buf, 1); For local filesystem such as XFS, "read" will be failed because XFS has 512Byte memory aligment for Direct/IO. But it's success for cifs. I don't know if it's expected. Could anybody tell me more about Direct/IO for cifs? Thanks. -- Best regards! XiaoLi Feng 冯小丽 Red Hat Software (Beijing) Co.,Ltd filesystem-qe Team IRC:xifeng，#channel: fs-qe Tel:+86-10-8388112 9/F, Raycom
