On 9 Jun 2021, at 10:41, Trond Myklebust wrote:

On Wed, 2021-06-09 at 10:31 -0400, Benjamin Coddington wrote:

quoted

It's not disputed that mounts waiting on the transport layer will block
other mounts.

It might be able to be changed:  there's this torch:
https://lore.kernel.org/linux-nfs/87378omld4.fsf@notabene.neil.brown.name/ (local)

No.

quoted

..or there may be another way we don't have to wait ..

OK. So let's look at how we can solve the problem of the initial
connection to the server timing out and causing hangs in
nfs41_walk_client_list(), and leave aside any other corner case
problems (such as the server going down while we're mounting).

How about something like the following (compile tested only) patch?

It works as intended for this case, but I don't have my head wrapped around
the implications of the change yet.

Ben