Re: [PATCH v2] NFSD: add rpc_status entry in nfsd debug filesystem

[Lorenzo Bianconi <lorenzo@kernel.org>]

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[...]
> > +			if (rqstp->rq_addr.ss_family == AF_INET)
> > +				seq_printf(m, " %pI4 %pI4 ",
> > +					   &((struct sockaddr_in *)&rqstp->rq_addr)->sin_addr,
> > +					   &((struct sockaddr_in *)&rqstp->rq_daddr)->sin_addr);
> > +			else if (rqstp->rq_addr.ss_family == AF_INET6)
> > +				seq_printf(m, " %pI6 %pI6 ",
> > +					   &((struct sockaddr_in6 *)&rqstp->rq_addr)->sin6_addr,
> > +					   &((struct sockaddr_in6 *)&rqstp->rq_daddr)->sin6_addr);
> > +			else
> > +				seq_printf(m, " unknown:%hu",
> 
> I think you'll need to add a second "unknown:%hu" here to keep the
> fields aligned. In the ipv4/6 case there are 2 addresses, so you need 2
> addresses here as well.

ack, I will fix it.

> 
> > +					   rqstp->rq_addr.ss_family);
> > +#ifdef CONFIG_NFSD_V4
> > +			if (rqstp->rq_vers == NFS4_VERSION &&
> > +			    rqstp->rq_proc == NFSPROC4_COMPOUND) {
> > +				/* NFSv4 compund */
> > +				struct nfsd4_compoundargs *args = rqstp->rq_argp;
> > +				struct nfsd4_compoundres *resp = rqstp->rq_resp;
> > +
> > +				while (resp->opcnt < args->opcnt) {
> > +					struct nfsd4_op *op = &args->ops[resp->opcnt++];
> > +
> > +					seq_printf(m, " %s", nfsd4_op_name(op->opnum));
> 
> Given that this is going to be a variable-length field, we should have a
> different delimiter between the different operations here. Maybe
> something like a ':' or '|' character? That way the script could parse
> the different operations, but we'd still be able to add new fields to
> the end of the line later if we decide it's worthwhile.

ack, I will fix it.

Regards,
Lorenzo

>  
> > +				}
> > +			}
> > +#endif /* CONFIG_NFSD_V4 */
> > +			seq_puts(m, "\n");
> > +		}
> > +	}
> > +
> > +	rcu_read_unlock();
> > +
> > +	return 0;
> > +}
> > +
> > +/**
> > + * nfsd_rpc_status_open - Atomically copy a write verifier
> > + * @inode: entry inode pointer.
> > + * @file: entry file pointer.
> > + *
> > + * This routine dumps pending RPC requests info queued into nfs server.
> > + */
> > +int nfsd_rpc_status_open(struct inode *inode, struct file *file)
> > +{
> > +	struct nfsd_net *nn = net_generic(inode->i_sb->s_fs_info, nfsd_net_id);
> > +
> > +	mutex_lock(&nfsd_mutex);
> > +	if (!nn->nfsd_serv) {
> > +		mutex_unlock(&nfsd_mutex);
> > +		return -ENODEV;
> > +	}
> > +
> > +	svc_get(nn->nfsd_serv);
> > +	mutex_unlock(&nfsd_mutex);
> > +
> > +	return single_open(file, nfsd_rpc_status_show, inode->i_private);
> > +}
> > diff --git a/net/sunrpc/svc.c b/net/sunrpc/svc.c
> > index 587811a002c9..44eac83b35a1 100644
> > --- a/net/sunrpc/svc.c
> > +++ b/net/sunrpc/svc.c
> > @@ -1629,7 +1629,7 @@ const char *svc_proc_name(const struct svc_rqst *rqstp)
> >  		return rqstp->rq_procinfo->pc_name;
> >  	return "unknown";
> >  }
> > -
> > +EXPORT_SYMBOL_GPL(svc_proc_name);
> >  
> >  /**
> >   * svc_encode_result_payload - mark a range of bytes as a result payload
> 
> Other than the nits above, this is looking good!
> -- 
> Jeff Layton <jlayton@kernel.org>

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