Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/fs/nfs/proc.c b/fs/nfs/proc.c
index e0c257b..0f7288b 100644
--- a/fs/nfs/proc.c
+++ b/fs/nfs/proc.c
@@ -490,7 +490,7 @@
  * from nfs_readdir by calling the decode_entry function directly.
  */
 static int
-nfs_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
+nfs_proc_readdir(struct dentry *dentry, const struct cred *cred,
 		 u64 cookie, struct page **pages, unsigned int count, bool plus)
 {
 	struct inode		*dir = d_inode(dentry);
@@ -594,7 +594,8 @@
 		/* Emulate the eof flag, which isn't normally needed in NFSv2
 		 * as it is guaranteed to always return the file attributes
 		 */
-		if (hdr->args.offset + hdr->res.count >= hdr->res.fattr->size)
+		if ((hdr->res.count == 0 && hdr->args.count > 0) ||
+		    hdr->args.offset + hdr->res.count >= hdr->res.fattr->size)
 			hdr->res.eof = 1;
 	}
 	return 0;
@@ -615,8 +616,10 @@
 
 static int nfs_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
 {
-	if (task->tk_status >= 0)
+	if (task->tk_status >= 0) {
+		hdr->res.count = hdr->args.count;
 		nfs_writeback_update_inode(hdr);
+	}
 	return 0;
 }