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Subject[PATCH 1/1] dm: Repair persistent minors
Split the dm_create() function into two variants, depending on whether
you want the device to have a specific minor number. This avoids
the broken overloading of the minor argument to the old dm_create().

--- diff/drivers/md/dm-ioctl.c 2003-06-11 10:31:17.000000000 +0100
+++ source/drivers/md/dm-ioctl.c 2003-06-11 10:32:11.000000000 +0100
@@ -560,7 +560,6 @@
int r;
struct dm_table *t;
struct mapped_device *md;
- unsigned int minor = 0;

r = check_name(param->name);
if (r)
@@ -577,9 +576,10 @@
}

if (param->flags & DM_PERSISTENT_DEV_FLAG)
- minor = minor(to_kdev_t(param->dev));
+ r = dm_create_with_minor(minor(to_kdev_t(param->dev)), t, &md);
+ else
+ r = dm_create(t, &md);

- r = dm_create(minor, t, &md);
if (r) {
dm_table_put(t);
return r;
--- diff/drivers/md/dm.c 2003-06-11 10:31:41.000000000 +0100
+++ source/drivers/md/dm.c 2003-06-11 10:32:54.000000000 +0100
@@ -569,7 +569,7 @@
/*
* Allocate and initialise a blank device with a given minor.
*/
-static struct mapped_device *alloc_dev(unsigned int minor)
+static struct mapped_device *alloc_dev(unsigned int minor, int persistent)
{
int r;
struct mapped_device *md = kmalloc(sizeof(*md), GFP_KERNEL);
@@ -580,7 +580,7 @@
}

/* get a minor number for the dev */
- r = (minor < 0) ? next_free_minor(&minor) : specific_minor(minor);
+ r = persistent ? specific_minor(minor) : next_free_minor(&minor);
if (r < 0) {
kfree(md);
return NULL;
@@ -660,13 +660,13 @@
/*
* Constructor for a new device.
*/
-int dm_create(unsigned int minor, struct dm_table *table,
- struct mapped_device **result)
+static int create_aux(unsigned int minor, int persistent,
+ struct dm_table *table, struct mapped_device **result)
{
int r;
struct mapped_device *md;

- md = alloc_dev(minor);
+ md = alloc_dev(minor, persistent);
if (!md)
return -ENXIO;

@@ -681,6 +681,17 @@
return 0;
}

+int dm_create(struct dm_table *table, struct mapped_device **result)
+{
+ return create_aux(0, 0, table, result);
+}
+
+int dm_create_with_minor(unsigned int minor,
+ struct dm_table *table, struct mapped_device **result)
+{
+ return create_aux(minor, 1, table, result);
+}
+
void dm_get(struct mapped_device *md)
{
atomic_inc(&md->holders);
--- diff/drivers/md/dm.h 2003-06-11 10:31:27.000000000 +0100
+++ source/drivers/md/dm.h 2003-06-11 10:32:11.000000000 +0100
@@ -51,8 +51,9 @@
* Functions for manipulating a struct mapped_device.
* Drop the reference with dm_put when you finish with the object.
*---------------------------------------------------------------*/
-int dm_create(unsigned int minor, struct dm_table *table,
- struct mapped_device **md);
+int dm_create(struct dm_table *table, struct mapped_device **md);
+int dm_create_with_minor(unsigned int minor, struct dm_table *table,
+ struct mapped_device **md);

/*
* Reference counting for md.
-
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