void dm_put(struct mapped_device *md)
{
struct dm_table *map = dm_get_table(md);
if (atomic_dec_and_test(&md->holders)) {
if (!test_bit(DMF_SUSPENDED, &md->flags) && map)
dm_table_suspend_targets(map);
__unbind(md);
free_dev(md);
}
dm_table_put(map);
}
void dm_put(struct mapped_device *md)
{
struct dm_table *map = dm_get_table(md);
if (atomic_dec_and_test(&md->holders)) {
if (!dm_suspended(md)) {
dm_table_presuspend_targets(map);
dm_table_postsuspend_targets(map);
}
__unbind(md);
free_dev(md);
}
dm_table_put(map);
}
/*
* Swap in a new table (destroying old one).
*/
int dm_swap_table(struct mapped_device *md, struct dm_table *table)
{
int r = -EINVAL;
down(&md->suspend_lock);
/* device must be suspended */
if (!dm_suspended(md))
goto out;
__unbind(md);
r = __bind(md, table);
out:
up(&md->suspend_lock);
return r;
}
/*
* Swap in a new table (destroying old one).
*/
int dm_swap_table(struct mapped_device *md, struct dm_table *table)
{
int r;
down_write(&md->lock);
/* device must be suspended */
if (!test_bit(DMF_SUSPENDED, &md->flags)) {
up_write(&md->lock);
return -EPERM;
}
__unbind(md);
r = __bind(md, table);
if (r)
return r;
up_write(&md->lock);
return 0;
}
void dm_put(struct mapped_device *md)
{
struct dm_table *map;
BUG_ON(test_bit(DMF_FREEING, &md->flags));
if (atomic_dec_and_lock(&md->holders, &_minor_lock)) {
map = dm_get_table(md);
idr_replace(&_minor_idr, MINOR_ALLOCED, dm_disk(md)->first_minor);
set_bit(DMF_FREEING, &md->flags);
spin_unlock(&_minor_lock);
if (!dm_suspended(md)) {
dm_table_presuspend_targets(map);
dm_table_postsuspend_targets(map);
}
__unbind(md);
dm_table_put(map);
free_dev(md);
}
}
/*
* Swap in a new table (destroying old one).
*/
int dm_swap_table(struct mapped_device *md, struct dm_table *table)
{
int r = -EINVAL;
down(&md->suspend_lock);
/* device must be suspended */
if (!dm_suspended(md))
goto out;
/* without bdev, the device size cannot be changed */
if (!md->suspended_bdev)
if (get_capacity(md->disk) != dm_table_get_size(table))
goto out;
__unbind(md);
r = __bind(md, table);
out:
up(&md->suspend_lock);
return r;
}