On Tue, 2021-02-02 at 14:49 -0500, Benjamin Coddington wrote: > On 2 Feb 2021, at 14:24, Dan Aloni wrote: > > > On Tue, Feb 02, 2021 at 01:52:10PM -0500, Anna Schumaker wrote: > > > You're welcome! I'll try to remember to CC him on future versions > > > On Tue, Feb 2, 2021 at 1:51 PM Chuck Lever > > > <chuck.lever@xxxxxxxxxx> wrote: > > > > > > > > I want to ensure Dan is aware of this work. Thanks for posting, > > > > Anna! > > > > Thanks Anna and Chuck. I'm accessing and monitoring the mailing > > list via > > NNTP and I'm also on #linux-nfs for chatting (da-x). > > > > I see srcaddr was already discussed, so the patches I'm planning to > > send > > next will be based on the latest version of your patchset and > > concern > > multipath. > > > > What I'm going for is the following: > > > > - Expose transports that are reachable from xprtmultipath. Each in > > its > > own sub-directory, with an interface and status representation > > similar > > to the top directory. > > - A way to add/remove transports. > > - Inspiration for coding this is various other things in the kernel > > that > > use configfs, perhaps it can be used here too. > > > > Also, what do you think would be a straightforward way for a > > userspace > > program to find what sunrpc client id serves a mountpoint? If we > > add an > > ioctl for the mountdir AFAIK it would be the first one that the NFS > > client supports, so I wonder if there's a better interface that can > > work > > for that. > > I'm a fan of adding an ioctl interface for userspace, but I think > we'd > better avoid using NFS itself because it would be nice to someday > implement > an NFS "shutdown" for non-responsive servers, but sending any ioctl > to the > mountpoint could revalidate it, and we'd hang on the GETATTR. > > Maybe we can figure out a way to expose the superblock via sysfs for > each > mount. Right. There is potential functionality here that we do not need or even want to expose via the mount interface. Being able to cancel all the hung RPC calls in an RPC queue, for instance, is not something you want to do through fsopen() and friends. -- Trond Myklebust Linux NFS client maintainer, Hammerspace trond.myklebust@xxxxxxxxxxxxxxx
