From 188888ac37c19e2c3facd4b8c45fee39d00a7bf1 Mon Sep 17 00:00:00 2001
From: Rob Norris <rob.norris@truenas.com>
Date: Sun, 15 Mar 2026 12:30:46 +1100
Subject: [PATCH] config: refuse to build without fs_context

Sponsored-by: TrueNAS
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Rob Norris <rob.norris@truenas.com>
Closes #18339
---
 config/kernel-fs-context.m4 | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/config/kernel-fs-context.m4 b/config/kernel-fs-context.m4
index 13e1f5ffc..317ddc212 100644
--- a/config/kernel-fs-context.m4
+++ b/config/kernel-fs-context.m4
@@ -29,5 +29,8 @@ AC_DEFUN([ZFS_AC_KERNEL_FS_CONTEXT], [
 		AC_DEFINE(HAVE_FS_CONTEXT, 1, [fs_context exists])
         ],[
 		AC_MSG_RESULT(no)
+		AC_MSG_ERROR([
+	*** This kernel does not have `struct fs_context`. OpenZFS cannot be compiled.
+		])
         ])
 ])