int dm_resume(struct mapped_device *md)
{
struct bio *def;
struct dm_table *map = dm_get_table(md);
down_write(&md->lock);
if (!map ||
!test_bit(DMF_SUSPENDED, &md->flags) ||
!dm_table_get_size(map)) {
up_write(&md->lock);
dm_table_put(map);
return -EINVAL;
}
dm_table_resume_targets(map);
clear_bit(DMF_SUSPENDED, &md->flags);
clear_bit(DMF_BLOCK_IO, &md->flags);
def = bio_list_get(&md->deferred);
__flush_deferred_io(md, def);
up_write(&md->lock);
__unlock_fs(md);
dm_table_unplug_all(map);
dm_table_put(map);
return 0;
}
static int __bind(struct mapped_device *md, struct dm_table *t)
{
request_queue_t *q = md->queue;
sector_t size;
size = dm_table_get_size(t);
/*
* Wipe any geometry if the size of the table changed.
*/
if (size != get_capacity(md->disk))
memset(&md->geometry, 0, sizeof(md->geometry));
if (md->suspended_bdev)
__set_size(md, size);
if (size == 0)
return 0;
dm_table_get(t);
dm_table_event_callback(t, event_callback, md);
write_lock(&md->map_lock);
md->map = t;
dm_table_set_restrictions(t, q);
write_unlock(&md->map_lock);
return 0;
}
int dm_resume(struct mapped_device *md)
{
int r = -EINVAL;
struct bio *def;
struct dm_table *map = NULL;
down(&md->suspend_lock);
if (!dm_suspended(md))
goto out;
map = dm_get_table(md);
if (!map || !dm_table_get_size(map))
goto out;
r = dm_table_resume_targets(map);
if (r)
goto out;
down_write(&md->io_lock);
clear_bit(DMF_BLOCK_IO, &md->flags);
def = bio_list_get(&md->deferred);
__flush_deferred_io(md, def);
up_write(&md->io_lock);
unlock_fs(md);
if (md->suspended_bdev) {
bdput(md->suspended_bdev);
md->suspended_bdev = NULL;
}
clear_bit(DMF_SUSPENDED, &md->flags);
dm_table_unplug_all(map);
kobject_uevent(&md->disk->kobj, KOBJ_CHANGE);
r = 0;
out:
dm_table_put(map);
up(&md->suspend_lock);
return r;
}
static int __bind(struct mapped_device *md, struct dm_table *t)
{
request_queue_t *q = md->queue;
sector_t size;
size = dm_table_get_size(t);
__set_size(md->disk, size);
if (size == 0)
return 0;
write_lock(&md->map_lock);
md->map = t;
write_unlock(&md->map_lock);
dm_table_get(t);
dm_table_event_callback(md->map, event_callback, md);
dm_table_set_restrictions(t, q);
return 0;
}
/*
* 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;
}
static int dm_blk_ioctl(struct inode *inode, struct file *file,
unsigned int cmd, unsigned long arg)
{
struct mapped_device *md;
struct dm_table *map;
struct dm_target *tgt;
int r = -ENOTTY;
/* We don't really need this lock, but we do need 'inode'. */
unlock_kernel();
md = inode->i_bdev->bd_disk->private_data;
map = dm_get_table(md);
if (!map || !dm_table_get_size(map))
goto out;
/* We only support devices that have a single target */
if (dm_table_get_num_targets(map) != 1)
goto out;
tgt = dm_table_get_target(map, 0);
if (dm_suspended(md)) {
r = -EAGAIN;
goto out;
}
if (tgt->type->ioctl)
r = tgt->type->ioctl(tgt, inode, file, cmd, arg);
out:
dm_table_put(map);
lock_kernel();
return r;
}
int dm_create_error_table(struct dm_table **result, struct mapped_device *md)
{
struct dm_table *t;
sector_t dev_size = 1;
int r;
/*
* Find current size of device.
* Default to 1 sector if inactive.
*/
t = dm_get_table(md);
if (t) {
dev_size = dm_table_get_size(t);
dm_table_put(t);
}
r = dm_table_create(&t, FMODE_READ, 1, md);
if (r)
return r;
r = dm_table_add_target(t, "error", 0, dev_size, NULL);
if (r)
goto out;
r = dm_table_complete(t);
if (r)
goto out;
*result = t;
out:
if (r)
dm_table_put(t);
return r;
}