NFS: Improvements for fs_context-related tracepoints

Add some missing observability to the fs_context tracepoints
added by commit 33ce83ef ("NFS: Replace fs_context-related
dprintk() call sites with tracepoints").
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>

fs/nfs/fs_context.c

@@ -791,16 +791,19 @@ static int nfs_fs_context_parse_param(struct fs_context *fc,
 		ctx->mount_server.addrlen = len;
 		break;
 	case Opt_nconnect:
+		trace_nfs_mount_assign(param->key, param->string);
 		if (result.uint_32 < 1 || result.uint_32 > NFS_MAX_CONNECTIONS)
 			goto out_of_bounds;
 		ctx->nfs_server.nconnect = result.uint_32;
 		break;
 	case Opt_max_connect:
+		trace_nfs_mount_assign(param->key, param->string);
 		if (result.uint_32 < 1 || result.uint_32 > NFS_MAX_TRANSPORTS)
 			goto out_of_bounds;
 		ctx->nfs_server.max_connect = result.uint_32;
 		break;
 	case Opt_lookupcache:
+		trace_nfs_mount_assign(param->key, param->string);
 		switch (result.uint_32) {
 		case Opt_lookupcache_all:
 			ctx->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
@@ -817,6 +820,7 @@ static int nfs_fs_context_parse_param(struct fs_context *fc,
 		}
 		break;
 	case Opt_local_lock:
+		trace_nfs_mount_assign(param->key, param->string);
 		switch (result.uint_32) {
 		case Opt_local_lock_all:
 			ctx->flags |= (NFS_MOUNT_LOCAL_FLOCK |
@@ -837,6 +841,7 @@ static int nfs_fs_context_parse_param(struct fs_context *fc,
 		}
 		break;
 	case Opt_write:
+		trace_nfs_mount_assign(param->key, param->string);
 		switch (result.uint_32) {
 		case Opt_write_lazy:
 			ctx->flags &=