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. I found an old post which said aio_fsync was already included in xfs (https://www.spinics.net/lists/xfs/msg28408.html) What xfs or kernel version should I use to get aio_fsync working? Thanks all. Shawn
