I would expect direct i/o to work with unaligned reads over SMB3 mounts. Let me know if you see different behavior to any servers. On Tue, Apr 30, 2019 at 4:01 AM Xiaoli Feng <xifeng@xxxxxxxxxx> wrote: > > 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 -- Thanks, Steve
