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SUNRPC/NFSD: Support a new option for ignoring the result of svc_register 

NFSv4 clients can contact port 2049 directly instead of needing the
portmapper.

Therefore a failure to register to the portmapper when starting an
NFSv4-only server isn't really a problem.

But Gareth Williams reports that an attempt to start an NFSv4-only
server without starting portmap fails:

  #rpc.nfsd -N 2 -N 3
  rpc.nfsd: writing fd to kernel failed: errno 111 (Connection refused)
  rpc.nfsd: unable to set any sockets for nfsd

Add a flag to svc_version to tell the rpc layer it can safely ignore an
rpcbind failure in the NFSv4-only case.

Reported-by: Gareth Williams <gareth@garethwilliams.me.uk>
Reviewed-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Kinglong Mee <kinglongmee@gmail.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
Kinglong Mee 2013-12-31 13:17:20 +08:00 committed by J. Bruce Fields
parent 8a891633b8
commit 7e55b59b2f
3 changed files with 21 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
fs/nfsd/nfs4proc.c
View File

@ -1882,6 +1882,7 @@ struct svc_version nfsd_version4 = {
.vs_proc = nfsd_procedures4,
.vs_dispatch = nfsd_dispatch,
.vs_xdrsize = NFS4_SVC_XDRSIZE,
.vs_rpcb_optnl = 1,
};
/*

4
include/linux/sunrpc/svc.h
View File

@ -386,8 +386,10 @@ struct svc_version {
struct svc_procedure * vs_proc; /* per-procedure info */
u32 vs_xdrsize; /* xdrsize needed for this version */
unsigned int vs_hidden : 1; /* Don't register with portmapper.
unsigned int vs_hidden : 1, /* Don't register with portmapper.
* Only used for nfsacl so far. */
vs_rpcb_optnl:1;/* Don't care the result of register.
* Only used for nfsv4. */
/* Override dispatch function (e.g. when caching replies).
* A return value of 0 means drop the request.

23
net/sunrpc/svc.c
View File

@ -916,9 +916,6 @@ static int __svc_register(struct net *net, const char *progname,
#endif
}
if (error < 0)
printk(KERN_WARNING "svc: failed to register %sv%u RPC "
"service (errno %d).\n", progname, version, -error);
return error;
}
@ -937,6 +934,7 @@ int svc_register(const struct svc_serv *serv, struct net *net,
const unsigned short port)
{
struct svc_program *progp;
struct svc_version *vers;
unsigned int i;
int error = 0;
@ -946,7 +944,8 @@ int svc_register(const struct svc_serv *serv, struct net *net,
for (progp = serv->sv_program; progp; progp = progp->pg_next) {
for (i = 0; i < progp->pg_nvers; i++) {
if (progp->pg_vers[i] == NULL)
vers = progp->pg_vers[i];
if (vers == NULL)
continue;
dprintk("svc: svc_register(%sv%d, %s, %u, %u)%s\n",
@ -955,18 +954,28 @@ int svc_register(const struct svc_serv *serv, struct net *net,
proto == IPPROTO_UDP? "udp" : "tcp",
port,
family,
progp->pg_vers[i]->vs_hidden?
vers->vs_hidden ?
" (but not telling portmap)" : "");
if (progp->pg_vers[i]->vs_hidden)
if (vers->vs_hidden)
continue;
error = __svc_register(net, progp->pg_name, progp->pg_prog,
i, family, proto, port);
if (error < 0)
if (vers->vs_rpcb_optnl) {
error = 0;
continue;
}
if (error < 0) {
printk(KERN_WARNING "svc: failed to register "
"%sv%u RPC service (errno %d).\n",
progp->pg_name, i, -error);
break;
}
}
}
return error;
}