Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/fs/nfs/filelayout/Makefile b/fs/nfs/filelayout/Makefile
index 8516cdf..de05631 100644
--- a/fs/nfs/filelayout/Makefile
+++ b/fs/nfs/filelayout/Makefile
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0-only
 #
 # Makefile for the pNFS Files Layout Driver kernel module
 #
diff --git a/fs/nfs/filelayout/filelayout.c b/fs/nfs/filelayout/filelayout.c
index d175724..c9b605f 100644
--- a/fs/nfs/filelayout/filelayout.c
+++ b/fs/nfs/filelayout/filelayout.c
@@ -904,7 +904,7 @@
 	status = filelayout_check_deviceid(lo, fl, gfp_flags);
 	if (status) {
 		pnfs_put_lseg(lseg);
-		lseg = ERR_PTR(status);
+		lseg = NULL;
 	}
 out:
 	return lseg;
@@ -917,7 +917,7 @@
 	pnfs_generic_pg_check_layout(pgio);
 	if (!pgio->pg_lseg) {
 		pgio->pg_lseg = fl_pnfs_update_layout(pgio->pg_inode,
-						      req->wb_context,
+						      nfs_req_openctx(req),
 						      0,
 						      NFS4_MAX_UINT64,
 						      IOMODE_READ,
@@ -944,7 +944,7 @@
 	pnfs_generic_pg_check_layout(pgio);
 	if (!pgio->pg_lseg) {
 		pgio->pg_lseg = fl_pnfs_update_layout(pgio->pg_inode,
-						      req->wb_context,
+						      nfs_req_openctx(req),
 						      0,
 						      NFS4_MAX_UINT64,
 						      IOMODE_RW,
@@ -1164,6 +1164,8 @@
 	.id			= LAYOUT_NFSV4_1_FILES,
 	.name			= "LAYOUT_NFSV4_1_FILES",
 	.owner			= THIS_MODULE,
+	.flags			= PNFS_LAYOUTGET_ON_OPEN,
+	.max_layoutget_response	= 4096, /* 1 page or so... */
 	.alloc_layout_hdr	= filelayout_alloc_layout_hdr,
 	.free_layout_hdr	= filelayout_free_layout_hdr,
 	.alloc_lseg		= filelayout_alloc_lseg,