Commit 3cb6ce4f authored by Andrew Morton's avatar Andrew Morton Committed by Linus Torvalds

[PATCH] dm: Repair persistent minors

From: Joe Thornber <thornber@sistina.com>

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().
parent 9cde68fc
......@@ -560,7 +560,6 @@ static int create(struct dm_ioctl *param, struct dm_ioctl *user)
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 @@ static int create(struct dm_ioctl *param, struct dm_ioctl *user)
}
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;
......
......@@ -569,7 +569,7 @@ static int next_free_minor(unsigned int *minor)
/*
* 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 @@ static struct mapped_device *alloc_dev(unsigned int minor)
}
/* 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 @@ static void __unbind(struct mapped_device *md)
/*
* 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 @@ int dm_create(unsigned int minor, struct dm_table *table,
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);
......
......@@ -51,7 +51,8 @@ struct mapped_device;
* 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,
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);
/*
......
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