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authorTrond Myklebust <trond.myklebust@hammerspace.com>2019-10-17 11:13:54 -0400
committerTrond Myklebust <trond.myklebust@hammerspace.com>2019-11-03 21:28:45 -0500
commite6237b6feb37582fbd6bd7a8336d1256a6b4b4f9 (patch)
treee58abfc21a4940c9191f9772605d7cf9c4c991e9 /include/linux/nfs_fs_sb.h
parent52f98f1a2ddd2bb561f2c7e3b19a81d816a63118 (diff)
NFSv4.1: Don't rebind to the same source port when reconnecting to the server
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>
Diffstat (limited to 'include/linux/nfs_fs_sb.h')
-rw-r--r--include/linux/nfs_fs_sb.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/nfs_fs_sb.h b/include/linux/nfs_fs_sb.h
index 69e80cef5a81..df61ff8981e8 100644
--- a/include/linux/nfs_fs_sb.h
+++ b/include/linux/nfs_fs_sb.h
@@ -47,6 +47,7 @@ struct nfs_client {
#define NFS_CS_TSM_POSSIBLE 5 /* - Maybe state migration */
#define NFS_CS_NOPING 6 /* - don't ping on connect */
#define NFS_CS_DS 7 /* - Server is a DS */
+#define NFS_CS_REUSEPORT 8 /* - reuse src port on reconnect */
struct sockaddr_storage cl_addr; /* server identifier */
size_t cl_addrlen;
char * cl_hostname; /* hostname of server */