Hi Steve, On Thu, Oct 20, 2022 at 10:24:22PM -0500, Steve French wrote: > I saw this patch series relating to exposing DIO alignment information > mentioned in lwn today > > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=825cf206ed51 > > Do you have any ideas of whether any network filesystem could support > this? There are lots of features about the server filesystem and > preferred i/o sizes etc. that can be sent over the protocol (for > SMB3.1.1). > > Looking at 6.1-rc1 - it looks like this was mainly for xfs and ext4 > but is there any reason that it would be beneficial for cifs.ko - and > if so is there more clarification on what information would be needed > from the server to set this value? > STATX_DIOALIGN can, and should, be supported by any filesystem that supports O_DIRECT. Its scope is specifically direct I/O alignment restrictions. It doesn't include anything about the preferred I/O size. Note that the existing field "stx_blksize" is already documented to be the preferred I/O size. If you have any more questions or thoughts about this, please bring them up on linux-fsdevel@xxxxxxxxxxxxxxx. That's where all the STATX_DIOALIGN stuff has been discussed. - Eric
