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SUNRPC: Use only rpcbind v2 for AF_INET requests 

Some server vendors support the higher versions of rpcbind only for
AF_INET6.  The kernel doesn't need to use v3 or v4 for AF_INET anyway,
so change the kernel's rpcbind client to query AF_INET servers over
rpcbind v2 only.

This has a few interesting benefits:

1. If the rpcbind request is going over TCP, and the server doesn't
   support rpcbind versions 3 or 4, the client reduces by two the number
   of ephemeral ports left in TIME_WAIT for each rpcbind request.  This
   will help during NFS mount storms.

2. The rpcbind interaction with servers that don't support rpcbind
   versions 3 or 4 will use less network traffic.  Also helpful
   during mount storms.

3. We can eliminate the kernel build option that controls whether the
   kernel's rpcbind client uses rpcbind version 3 and 4 for AF_INET
   servers.  Less complicated kernel configuration...

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Chuck Lever 2008-06-25 17:24:54 -04:00 committed by Trond Myklebust
parent 8842413aa4
commit 40fef8a649
2 changed files with 0 additions and 33 deletions
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21
fs/Kconfig
View File

@ -1799,27 +1799,6 @@ config SUNRPC_XPRT_RDMA
If unsure, say N.
config SUNRPC_BIND34
bool "Support for rpcbind versions 3 & 4 (EXPERIMENTAL)"
depends on SUNRPC && EXPERIMENTAL
default n
help
RPC requests over IPv6 networks require support for larger
addresses when performing an RPC bind. Sun added support for
IPv6 addressing by creating two new versions of the rpcbind
protocol (RFC 1833).
This option enables support in the kernel RPC client for
querying rpcbind servers via versions 3 and 4 of the rpcbind
protocol. The kernel automatically falls back to version 2
if a remote rpcbind service does not support versions 3 or 4.
By themselves, these new versions do not provide support for
RPC over IPv6, but the new protocol versions are necessary to
support it.
If unsure, say N to get traditional behavior (version 2 rpcbind
requests only).
config RPCSEC_GSS_KRB5
tristate "Secure RPC: Kerberos V mechanism (EXPERIMENTAL)"
depends on SUNRPC && EXPERIMENTAL

12
net/sunrpc/rpcb_clnt.c
View File

@ -592,16 +592,6 @@ static struct rpc_procinfo rpcb_procedures4[] = {
};
static struct rpcb_info rpcb_next_version[] = {
#ifdef CONFIG_SUNRPC_BIND34
{
.rpc_vers = RPCBVERS_4,
.rpc_proc = &rpcb_procedures4[RPCBPROC_GETADDR],
},
{
.rpc_vers = RPCBVERS_3,
.rpc_proc = &rpcb_procedures3[RPCBPROC_GETADDR],
},
#endif
{
.rpc_vers = RPCBVERS_2,
.rpc_proc = &rpcb_procedures2[RPCBPROC_GETPORT],
@ -612,7 +602,6 @@ static struct rpcb_info rpcb_next_version[] = {
};
static struct rpcb_info rpcb_next_version6[] = {
#ifdef CONFIG_SUNRPC_BIND34
{
.rpc_vers = RPCBVERS_4,
.rpc_proc = &rpcb_procedures4[RPCBPROC_GETADDR],
@ -621,7 +610,6 @@ static struct rpcb_info rpcb_next_version6[] = {
.rpc_vers = RPCBVERS_3,
.rpc_proc = &rpcb_procedures3[RPCBPROC_GETADDR],
},
#endif
{
.rpc_proc = NULL,
},