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From 4a8d1cb76c2a95efbc75659a43ac643f22e8a155 Mon Sep 17 00:00:00 2001
From: Bruce Ashfield <bruce.ashfield@windriver.com>
Date: Thu, 8 Apr 2010 23:44:21 -0700
Subject: [PATCH] check console device file on fs when booting
If a root filesystem is generated as non-root, one of
the tell tale signs is /dev/console not being a character
file. To save a whole class of questions, let's just test
for the condition and let the user know.
Signed-off-by: Richard Laroque <rlarocqu@windriver.com>
Signed-off-by: Bruce Ashfield <bruce.ashfield@windriver.com>
---
init/main.c | 15 +++++++++++++++
1 file changed, 15 insertions(+)
diff --git a/init/main.c b/init/main.c
index ae78fb68d231..69bc15d35dd0 100644
--- a/init/main.c
+++ b/init/main.c
@@ -1463,6 +1463,18 @@ static int __ref kernel_init(void *unused)
/* Open /dev/console, for stdin/stdout/stderr, this should never fail */
void __init console_on_rootfs(void)
{
+#ifndef CONFIG_BLK_DEV_INITRD
+ /*
+ * Use /dev/console to infer if the rootfs is setup properly.
+ * In case of initrd or initramfs /dev/console might be instantiated
+ * later by /init so don't do this check for CONFIG_BLK_DEV_INITRD
+ */
+ if (vfs_lstat((char __user *) "/dev/console", (struct kstat __user *) &console_stat)
+ || !S_ISCHR(console_stat.mode)) {
+ panic("/dev/console is missing or not a character device!\nPlease ensure your rootfs is properly configured\n");
+ }
+#endif
+
struct file *file = filp_open("/dev/console", O_RDWR, 0);
if (IS_ERR(file)) {
@@ -1477,6 +1489,9 @@ void __init console_on_rootfs(void)
static noinline void __init kernel_init_freeable(void)
{
+#ifndef CONFIG_BLK_DEV_INITRD
+ struct kstat console_stat;
+#endif
/*
* Wait until kthreadd is all set-up.
*/
--
2.19.1
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