On Fri, Jun 16, 2017 at 03:02:09PM +1000, NeilBrown wrote: > When a loop device is being shutdown the backing file is > closed with fput(). This is different from how close(2) > closes files - it uses filp_close(). > > The difference is important for filesystems which provide a ->flush > file operation such as NFS. NFS assumes a flush will always > be called on last close, and gets confused otherwise. Huh? You do realize that mmap() + close() + modify + msync() + munmap() will have IO done *after* the last flush, right?
