linux-kernel - [PATCH] init: Mount devtmpfs before mounting root.

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Message-Id: <1411819722-10684-1-git-send-email-hristo@venev.name>
Date:	Sat, 27 Sep 2014 15:08:42 +0300
From:	hristo@...sto.venev.name
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org, Hristo Venev <hristo@...ev.name>
Subject: [PATCH] init: Mount devtmpfs before mounting root.

btrfs may require /dev in case there are multiple devices

Example:
root=/dev/sda1 rootfstype=btrfs rootflags=device=/dev/sdb1
---
 init/do_mounts.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/init/do_mounts.c b/init/do_mounts.c
index 82f2288..9612958 100644
--- a/init/do_mounts.c
+++ b/init/do_mounts.c
@@ -527,8 +527,10 @@ void __init mount_root(void)
 	}
 #endif
 #ifdef CONFIG_BLOCK
+	sys_mount(NULL, "/dev", "devtmpfs", 0, NULL);
 	create_dev("/dev/root", ROOT_DEV);
 	mount_block_root("/dev/root", root_mountflags);
+	sys_umount("/dev", 0);
 #endif
 }
 
-- 
2.1.1

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