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NFSv4.1: Don't rebind to the same source port when reconnecting to the server

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NFSv2, v3 and NFSv4 servers often have duplicate replay caches that look
at the source port when deciding whether or not an RPC call is a replay
of a previous call. This requires clients to perform strange TCP gymnastics
in order to ensure that when they reconnect to the server, they bind
to the same source port.

NFSv4.1 and NFSv4.2 have sessions that provide proper replay semantics,
that do not look at the source port of the connection. This patch therefore
ensures they can ignore the rebind requirement.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
This commit is contained in:
Trond Myklebust 2019-10-17 11:13:54 -04:00
parent 52f98f1a2d
commit e6237b6feb
8 changed files with 20 additions and 5 deletions
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1
include/linux/sunrpc/clnt.h
View file

@ -149,6 +149,7 @@ struct rpc_add_xprt_test {
#define RPC_CLNT_CREATE_NO_IDLE_TIMEOUT (1UL << 8)
#define RPC_CLNT_CREATE_NO_RETRANS_TIMEOUT (1UL << 9)
#define RPC_CLNT_CREATE_SOFTERR (1UL << 10)
#define RPC_CLNT_CREATE_REUSEPORT (1UL << 11)
struct rpc_clnt *rpc_create(struct rpc_create_args *args);
struct rpc_clnt *rpc_bind_new_program(struct rpc_clnt *,

3
include/linux/sunrpc/xprt.h
View file

@ -207,7 +207,8 @@ struct rpc_xprt {
unsigned int min_reqs; /* min number of slots */
unsigned int num_reqs; /* total slots */
unsigned long state; /* transport state */
unsigned char resvport : 1; /* use a reserved port */
unsigned char resvport : 1, /* use a reserved port */
reuseport : 1; /* reuse port on reconnect */
atomic_t swapper; /* we're swapping over this
transport */
unsigned int bind_index; /* bind function index */