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authorKay Sievers <kay.sievers@vrfy.org>2009-04-30 09:23:42 -0400
committerGreg Kroah-Hartman <gregkh@suse.de>2009-09-15 12:50:49 -0400
commit2b2af54a5bb6f7e80ccf78f20084b93c398c3a8b (patch)
treebb27e3b16a2a8fadeea869033a406f0a19b63e29 /init/main.c
parentea5ffff57dce2f4c85ab056f4b0a202f71db2bdf (diff)
Driver Core: devtmpfs - kernel-maintained tmpfs-based /dev
Devtmpfs lets the kernel create a tmpfs instance called devtmpfs very early at kernel initialization, before any driver-core device is registered. Every device with a major/minor will provide a device node in devtmpfs. Devtmpfs can be changed and altered by userspace at any time, and in any way needed - just like today's udev-mounted tmpfs. Unmodified udev versions will run just fine on top of it, and will recognize an already existing kernel-created device node and use it. The default node permissions are root:root 0600. Proper permissions and user/group ownership, meaningful symlinks, all other policy still needs to be applied by userspace. If a node is created by devtmps, devtmpfs will remove the device node when the device goes away. If the device node was created by userspace, or the devtmpfs created node was replaced by userspace, it will no longer be removed by devtmpfs. If it is requested to auto-mount it, it makes init=/bin/sh work without any further userspace support. /dev will be fully populated and dynamic, and always reflect the current device state of the kernel. With the commonly used dynamic device numbers, it solves the problem where static devices nodes may point to the wrong devices. It is intended to make the initial bootup logic simpler and more robust, by de-coupling the creation of the inital environment, to reliably run userspace processes, from a complex userspace bootstrap logic to provide a working /dev. Signed-off-by: Kay Sievers <kay.sievers@vrfy.org> Signed-off-by: Jan Blunck <jblunck@suse.de> Tested-By: Harald Hoyer <harald@redhat.com> Tested-By: Scott James Remnant <scott@ubuntu.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'init/main.c')
-rw-r--r--init/main.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/init/main.c b/init/main.c
index b34fd8e5edef..8e6a7846bd07 100644
--- a/init/main.c
+++ b/init/main.c
@@ -68,6 +68,7 @@
68#include <linux/async.h> 68#include <linux/async.h>
69#include <linux/kmemcheck.h> 69#include <linux/kmemcheck.h>
70#include <linux/kmemtrace.h> 70#include <linux/kmemtrace.h>
71#include <linux/shmem_fs.h>
71#include <trace/boot.h> 72#include <trace/boot.h>
72 73
73#include <asm/io.h> 74#include <asm/io.h>
@@ -809,6 +810,7 @@ static void __init do_basic_setup(void)
809 init_workqueues(); 810 init_workqueues();
810 cpuset_init_smp(); 811 cpuset_init_smp();
811 usermodehelper_init(); 812 usermodehelper_init();
813 init_tmpfs();
812 driver_init(); 814 driver_init();
813 init_irq_proc(); 815 init_irq_proc();
814 do_ctors(); 816 do_ctors();