This patch changes the interface of dm_create() and alloc_dev()
so that the creator can specify whether the created device should
be hooked at bio-level or request-level.
Actual implementation of request-based initialization is done
in a separate patch.
Signed-off-by: Kiyoshi Ueda <k-ueda@xxxxxxxxxxxxx>
Signed-off-by: Jun'ichi Nomura <j-nomura@xxxxxxxxxxxxx>
diff -rupN 2-add-generic-hook/drivers/md/dm.c 3-create-iface-change/drivers/md/dm.c
--- 2-add-generic-hook/drivers/md/dm.c 2006-12-11 14:32:53.000000000 -0500
+++ 3-create-iface-change/drivers/md/dm.c 2006-12-15 10:24:52.000000000 -0500
@@ -923,7 +923,7 @@ static struct block_device_operations dm
/*
* Allocate and initialise a blank device with a given minor.
*/
-static struct mapped_device *alloc_dev(int minor)
+static struct mapped_device *alloc_dev(int minor, int request_base)
{
int r;
struct mapped_device *md = kmalloc(sizeof(*md), GFP_KERNEL);
@@ -1109,11 +1109,12 @@ static void __unbind(struct mapped_devic
/*
* Constructor for a new device.
*/
-int dm_create(int minor, struct mapped_device **result)
+int dm_create(int minor, struct mapped_device **result, unsigned create_flags)
{
struct mapped_device *md;
+ int request_base = create_flags & DM_CREATE_REQUEST_BASE_FLAG ? 1 : 0;
- md = alloc_dev(minor);
+ md = alloc_dev(minor, request_base);
if (!md)
return -ENXIO;
diff -rupN 2-add-generic-hook/drivers/md/dm-ioctl.c 3-create-iface-change/drivers/md/dm-ioctl.c
--- 2-add-generic-hook/drivers/md/dm-ioctl.c 2006-12-11 14:32:53.000000000 -0500
+++ 3-create-iface-change/drivers/md/dm-ioctl.c 2006-12-15 10:24:52.000000000 -0500
@@ -565,6 +565,7 @@ static int dev_create(struct dm_ioctl *p
{
int r, m = DM_ANY_MINOR;
struct mapped_device *md;
+ unsigned create_flags = 0;
r = check_name(param->name);
if (r)
@@ -573,7 +574,7 @@ static int dev_create(struct dm_ioctl *p
if (param->flags & DM_PERSISTENT_DEV_FLAG)
m = MINOR(huge_decode_dev(param->dev));
- r = dm_create(m, &md);
+ r = dm_create(m, &md, create_flags);
if (r)
return r;
diff -rupN 2-add-generic-hook/include/linux/device-mapper.h 3-create-iface-change/include/linux/device-mapper.h
--- 2-add-generic-hook/include/linux/device-mapper.h 2006-12-11 14:32:53.000000000 -0500
+++ 3-create-iface-change/include/linux/device-mapper.h 2006-12-15 10:24:52.000000000 -0500
@@ -155,7 +155,7 @@ int dm_unregister_target(struct target_t
* DM_ANY_MINOR chooses the next available minor number.
*/
#define DM_ANY_MINOR (-1)
-int dm_create(int minor, struct mapped_device **md);
+int dm_create(int minor, struct mapped_device **md, unsigned create_flags);
/*
* Reference counting for md.
--
dm-devel mailing list
dm-devel@xxxxxxxxxx
https://www.redhat.com/mailman/listinfo/dm-devel
