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-   -   Add support for dm-mod module autoloading (http://www.linux-archive.org/device-mapper-development/405702-add-support-dm-mod-module-autoloading.html)

Peter Rajnoha 07-29-2010 01:02 PM

Add support for dm-mod module autoloading
 
Add devname:mapper/control and MAPPER_CTRL_MINOR module alias
to support dm-mod module autoloading.

Signed-off-by: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Peter Rajnoha <prajnoha@redhat.com>
---
Documentation/devices.txt | 1 +
drivers/md/dm-ioctl.c | 7 +++++--
include/linux/dm-ioctl.h | 1 +
include/linux/miscdevice.h | 1 +
4 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/Documentation/devices.txt b/Documentation/devices.txt
index 1d83d12..be55807 100644
--- a/Documentation/devices.txt
+++ b/Documentation/devices.txt
@@ -445,6 +445,7 @@ Your cooperation is appreciated.
233 = /dev/kmview View-OS A process with a view
234 = /dev/btrfs-control Btrfs control device
235 = /dev/autofs Autofs control device
+ 236 = /dev/mapper/control Device-Mapper control device
240-254 Reserved for local use
255 Reserved for MISC_DYNAMIC_MINOR

diff --git a/drivers/md/dm-ioctl.c b/drivers/md/dm-ioctl.c
index 6acca8a..efe6eda 100644
--- a/drivers/md/dm-ioctl.c
+++ b/drivers/md/dm-ioctl.c
@@ -1592,12 +1592,15 @@ static const struct file_operations _ctl_fops = {
};

static struct miscdevice _dm_misc = {
- .minor = MISC_DYNAMIC_MINOR,
+ .minor = MAPPER_CTRL_MINOR,
.name = DM_NAME,
- .nodename = "mapper/control",
+ .nodename = DM_DIR "/" DM_CONTROL_NODE,
.fops = &_ctl_fops
};

+MODULE_ALIAS_MISCDEV(MAPPER_CTRL_MINOR);
+MODULE_ALIAS("devname:" DM_DIR "/" DM_CONTROL_NODE);
+
/*
* Create misc character device and link to DM_DIR/control.
*/
diff --git a/include/linux/dm-ioctl.h b/include/linux/dm-ioctl.h
index 43b2de1..49eab36 100644
--- a/include/linux/dm-ioctl.h
+++ b/include/linux/dm-ioctl.h
@@ -11,6 +11,7 @@
#include <linux/types.h>

#define DM_DIR "mapper" /* Slashes not supported */
+#define DM_CONTROL_NODE "control"
#define DM_MAX_TYPE_NAME 16
#define DM_NAME_LEN 128
#define DM_UUID_LEN 129
diff --git a/include/linux/miscdevice.h b/include/linux/miscdevice.h
index f6c9b7d..bafffc7 100644
--- a/include/linux/miscdevice.h
+++ b/include/linux/miscdevice.h
@@ -38,6 +38,7 @@
#define KVM_MINOR 232
#define BTRFS_MINOR 234
#define AUTOFS_MINOR 235
+#define MAPPER_CTRL_MINOR 236
#define MISC_DYNAMIC_MINOR 255

struct device;

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