From de86af48faa03a824917ac90f4776481c7ce9e54 Mon Sep 17 00:00:00 2001
From: Samuel Dionne-Riel <samuel@dionne-riel.com>
Date: Wed, 26 Dec 2018 15:30:04 -0500
Subject: [PATCH] linuxPackages_4_{19,20}: works around bug with overlayfs.

See: https://github.com/NixOS/nixpkgs/issues/48828#issuecomment-445208626
---
 pkgs/os-specific/linux/kernel/patches.nix | 10 ++++++++++
 pkgs/top-level/all-packages.nix           |  2 ++
 2 files changed, 12 insertions(+)

diff --git a/pkgs/os-specific/linux/kernel/patches.nix b/pkgs/os-specific/linux/kernel/patches.nix
index d54e0153229d..dc41c2e5f15d 100644
--- a/pkgs/os-specific/linux/kernel/patches.nix
+++ b/pkgs/os-specific/linux/kernel/patches.nix
@@ -58,4 +58,14 @@ rec {
     };
   };
 
+  # Reverts a change related to the overlayfs overhaul in 4.19
+  # https://github.com/NixOS/nixpkgs/issues/48828#issuecomment-445208626
+  revert-vfs-dont-open-real = rec {
+	name = "revert-vfs-dont-open-real";
+	patch = fetchpatch {
+	  name = name + ".patch";
+	  url = https://github.com/samueldr/linux/commit/ee23fa215caaa8102f4ab411d39fcad5858147f2.patch;
+	  sha256 = "0bp4jryihg1y2sl8zlj6w7vvnxj0kmb6xdy42hpvdv43kb6ngiaq";
+	};
+  };
 }
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index eac05e5125db..78c9693fe4ed 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -14560,6 +14560,7 @@ in
         # when adding a new linux version
         # kernelPatches.cpu-cgroup-v2."4.11"
         kernelPatches.modinst_arg_list_too_long
+        kernelPatches.revert-vfs-dont-open-real
       ];
   };
 
@@ -14570,6 +14571,7 @@ in
         # when adding a new linux version
         # kernelPatches.cpu-cgroup-v2."4.11"
         kernelPatches.modinst_arg_list_too_long
+        kernelPatches.revert-vfs-dont-open-real
       ];
   };