Re: add devname module aliases to allow module on-demandauto-loading
From: Kay Sievers
Date: Fri May 21 2010 - 07:25:40 EST
On Fri, 2010-05-21 at 19:11 +0800, Ian Kent wrote:
> On Thu, 2010-05-20 at 18:07 +0200, Kay Sievers wrote:
> > --- a/fs/autofs4/dev-ioctl.c
> > +MODULE_ALIAS_MISCDEV(BTRFS_MINOR);
>
> Is this a typo or am I missing something?
Yikes, sorry, that's just broken. New patch. Thanks a lot for checking.
Kay
From: Kay Sievers <kay.sievers@xxxxxxxx>
Subject: add devname module aliases to allow module on-demand auto-loading
This adds:
alias: devname:<name>
to some common kernel modules, which will allow the on-demand loading
of the kernel module when the device node is accessed.
Ideally all these modules would be compiled-in, but distros seems too
much in love with their modularization that we need to cover the common
cases with this new facility. It will allow us to remove a bunch of pretty
useless init scripts and modprobes from init scripts.
The static device node aliases will be carried in the module itself. The
program depmod will extract this information to a file in the module directory:
$ cat /lib/modules/2.6.34-00650-g537b60d-dirty/modules.devname
# Device nodes to trigger on-demand module loading.
microcode cpu/microcode c10:184
fuse fuse c10:229
ppp_generic ppp c108:0
tun net/tun c10:200
dm_mod mapper/control c10:235
Udev will pick up the depmod created file on startup and create all the
static device nodes which the kernel modules specify, so that these modules
get automatically loaded when the device node is accessed:
$ /sbin/udevd --debug
...
static_dev_create_from_modules: mknod '/dev/cpu/microcode' c10:184
static_dev_create_from_modules: mknod '/dev/fuse' c10:229
static_dev_create_from_modules: mknod '/dev/ppp' c108:0
static_dev_create_from_modules: mknod '/dev/net/tun' c10:200
static_dev_create_from_modules: mknod '/dev/mapper/control' c10:235
udev_rules_apply_static_dev_perms: chmod '/dev/net/tun' 0666
udev_rules_apply_static_dev_perms: chmod '/dev/fuse' 0666
A few device nodes are switched to statically allocated numbers, to allow
the static nodes to work. This might also useful for systems which still run
a plain static /dev, which is completely unsafe to use with any dynamic minor
numbers.
Note:
The devname aliases must be limited to the *common* and *single*instance*
device nodes, like the misc devices, and never be used for conceptually limited
systems like the loop devices, which should rather get fixed properly and get a
control node for losetup to talk to, instead of creating a random number of
device nodes in advance, regardless if they are ever used.
This facility is to hide the mess distros are creating with too modualized
kernels, and just to hide that these modules are not compiled-in, and not to
paper-over broken concepts. Thanks! :)
Cc: Greg Kroah-Hartman <gregkh@xxxxxxx>
Cc: David S. Miller <davem@xxxxxxxxxxxxx>
Cc: Miklos Szeredi <miklos@xxxxxxxxxx>
Cc: Chris Mason <chris.mason@xxxxxxxxxx>
Cc: Alasdair G Kergon <agk@xxxxxxxxxx>
Cc: Tigran Aivazian <tigran@xxxxxxxxxxxxxxxxxxxx>
Cc: Ian Kent <raven@xxxxxxxxxx>
Signed-Off-By: Kay Sievers <kay.sievers@xxxxxxxx>
---
Documentation/devices.txt | 3 +++
arch/x86/kernel/microcode_core.c | 1 +
drivers/md/dm-ioctl.c | 5 ++++-
drivers/net/ppp_generic.c | 4 ++--
drivers/net/tun.c | 1 +
fs/autofs4/dev-ioctl.c | 5 ++++-
fs/btrfs/super.c | 5 ++++-
fs/fuse/dev.c | 1 +
include/linux/miscdevice.h | 3 +++
9 files changed, 23 insertions(+), 5 deletions(-)
--- a/Documentation/devices.txt
+++ b/Documentation/devices.txt
@@ -443,6 +443,9 @@ Your cooperation is appreciated.
231 = /dev/snapshot System memory snapshot device
232 = /dev/kvm Kernel-based virtual machine (hardware virtualization extensions)
233 = /dev/kmview View-OS A process with a view
+ 234 = /dev/btrfs-control Btrfs control device
+ 235 = /dev/mapper/control Device-Mapper control device
+ 236 = /dev/autofs Autofs control device
240-254 Reserved for local use
255 Reserved for MISC_DYNAMIC_MINOR
--- a/arch/x86/kernel/microcode_core.c
+++ b/arch/x86/kernel/microcode_core.c
@@ -260,6 +260,7 @@ static void microcode_dev_exit(void)
}
MODULE_ALIAS_MISCDEV(MICROCODE_MINOR);
+MODULE_ALIAS("devname:cpu/microcode");
#else
#define microcode_dev_init() 0
#define microcode_dev_exit() do { } while (0)
--- a/drivers/md/dm-ioctl.c
+++ b/drivers/md/dm-ioctl.c
@@ -1599,12 +1599,15 @@ static const struct file_operations _ctl
};
static struct miscdevice _dm_misc = {
- .minor = MISC_DYNAMIC_MINOR,
+ .minor = MAPPER_CTRL_MINOR,
.name = DM_NAME,
.nodename = "mapper/control",
.fops = &_ctl_fops
};
+MODULE_ALIAS_MISCDEV(MAPPER_CTRL_MINOR);
+MODULE_ALIAS("devname:mapper/control");
+
/*
* Create misc character device and link to DM_DIR/control.
*/
--- a/drivers/net/ppp_generic.c
+++ b/drivers/net/ppp_generic.c
@@ -2907,5 +2907,5 @@ EXPORT_SYMBOL(ppp_output_wakeup);
EXPORT_SYMBOL(ppp_register_compressor);
EXPORT_SYMBOL(ppp_unregister_compressor);
MODULE_LICENSE("GPL");
-MODULE_ALIAS_CHARDEV_MAJOR(PPP_MAJOR);
-MODULE_ALIAS("/dev/ppp");
+MODULE_ALIAS_CHARDEV(PPP_MAJOR, 0);
+MODULE_ALIAS("devname:ppp");
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -1624,3 +1624,4 @@ MODULE_DESCRIPTION(DRV_DESCRIPTION);
MODULE_AUTHOR(DRV_COPYRIGHT);
MODULE_LICENSE("GPL");
MODULE_ALIAS_MISCDEV(TUN_MINOR);
+MODULE_ALIAS("devname:net/tun");
--- a/fs/autofs4/dev-ioctl.c
+++ b/fs/autofs4/dev-ioctl.c
@@ -736,11 +736,14 @@ static const struct file_operations _dev
};
static struct miscdevice _autofs_dev_ioctl_misc = {
- .minor = MISC_DYNAMIC_MINOR,
+ .minor = AUTOFS_MINOR,
.name = AUTOFS_DEVICE_NAME,
.fops = &_dev_ioctl_fops
};
+MODULE_ALIAS_MISCDEV(AUTOFS_MINOR);
+MODULE_ALIAS("devname:autofs");
+
/* Register/deregister misc character device */
int autofs_dev_ioctl_init(void)
{
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -832,11 +832,14 @@ static const struct file_operations btrf
};
static struct miscdevice btrfs_misc = {
- .minor = MISC_DYNAMIC_MINOR,
+ .minor = BTRFS_MINOR,
.name = "btrfs-control",
.fops = &btrfs_ctl_fops
};
+MODULE_ALIAS_MISCDEV(BTRFS_MINOR);
+MODULE_ALIAS("devname:btrfs-control");
+
static int btrfs_interface_init(void)
{
return misc_register(&btrfs_misc);
--- a/fs/fuse/dev.c
+++ b/fs/fuse/dev.c
@@ -18,6 +18,7 @@
#include <linux/slab.h>
MODULE_ALIAS_MISCDEV(FUSE_MINOR);
+MODULE_ALIAS("devname:fuse");
static struct kmem_cache *fuse_req_cachep;
--- a/include/linux/miscdevice.h
+++ b/include/linux/miscdevice.h
@@ -31,6 +31,9 @@
#define FUSE_MINOR 229
#define KVM_MINOR 232
#define VHOST_NET_MINOR 233
+#define BTRFS_MINOR 234
+#define MAPPER_CTRL_MINOR 235
+#define AUTOFS_MINOR 236
#define MISC_DYNAMIC_MINOR 255
struct device;
--
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