On Fri, Oct 28, 2022 at 03:11:15PM -0700, Neutron Sharc wrote: > Hello all, > I have a workload that benefits the most if I can issue async fsync > after many async writes are completed. I was under the impression that > xfs/ext4 both support async fsync so I can use libaio to submit fsync. > When I tested with io_submit(fsync), it always returned EINVAL. So I > browsed the linux source (both kernel 3.10, 4.14) and I found > xfs/xfs_file.c doesn't implement "aio_fsync", nor does ext4/file.c. Generic support for IOCB_CMD_FSYNC and IOCB_CMD_FDSYNC was added into 4.17. As a result it should be supported by almost all filesystems, not just XFS.... > I found an old post which said aio_fsync was already included in xfs > (https://www.spinics.net/lists/xfs/msg28408.html) Yeah, the code that went into fs/aio.c was pretty much a generic version of this. > What xfs or kernel version should I use to get aio_fsync working? Thanks all. Just a kernel that isn't ancient. If you are looking for features, always check latest code first, then go back and find when it was merged (git log, git blame, etc). That's all I did.... -Dave. -- Dave Chinner david@xxxxxxxxxxxxx
