Re: [Libguestfs] [PATCH nbdkit v2] ssh: Allow the remote file to be created

On Sun, Apr 17, 2022 at 10:09:32AM +0100, Richard W.M. Jones wrote: Actually no we're not OK. Two connections could run .open in parallel so that's not safe. As an aside, the whole reason we use SERIALIZE_REQUESTS (and not PARALLEL) in the first place is because SFTP has no atomic pread/pwrite calls, so we have to simulate them with seek + read/write. We could open multiple SFTP connections which AIUI would get multiplexed over the SSH TCP connection, but the implementation would be significantly more complicated, and you get most of the benefit using NBD multi-conn. Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones Read my programming and virtualization blog: http://rwmj.wordpress.com virt-top is 'top' for virtual machines. Tiny program with many powerful monitoring features, net stats, disk stats, logging, etc. http://people.redhat.com/~rjones/virt-top