Re: [PATCH RESEND v2 08/13] SUNRPC: let procfs copy out reads

[Chuck Lever]

On Wed, Nov 4, 2026, at 2:59 PM, Christian Brauner wrote:
> Implement ->proc_read_buf() for the procfs channel, flush,
> use-gss-proxy and gss_krb5_enctypes files so procfs copies what is read
> to userspace after it unpinned the entry.
>
> cache_read() takes an iov_iter now. The rpc_pipefs channel file passes
> one for the user buffer and behaves like before. The procfs one passes
> one for procfs' buffer, and a read still hands out at most one request.
> A reader of the procfs channel file whose copy out fails, a readv()
> with a bad later segment included, loses what was handed out, since the
> request moves on before procfs copies it out. If that was only part of
> a request the next read returns the rest of it. Both flush files share
> flush_time_text().
>
> The procfs files are removed when the network namespace goes away and
> that no longer waits for a reader that faults on its buffer.
>
> Signed-off-by: Christian Brauner (Amutable) <brau...@kernel.org>

Acked-by: Chuck Lever <c...@kernel.org>


-- 
Chuck Lever (Come to NFS bake-a-thon! https://nfsv4bat.org)