int
blktap_control_destroy_device(struct blktap *tap)
{
int err;
unsigned long inuse;
if (!tap)
return 0;
set_bit(BLKTAP_SHUTDOWN_REQUESTED, &tap->dev_inuse);
for (;;) {
inuse = tap->dev_inuse;
err = blktap_device_destroy(tap);
if (err)
goto wait;
inuse = tap->dev_inuse;
err = blktap_ring_destroy(tap);
if (err)
goto wait;
inuse = tap->dev_inuse;
err = blktap_sysfs_destroy(tap);
if (err)
goto wait;
break;
wait:
BTDBG("inuse: 0x%lx, dev_inuse: 0x%lx\n",
inuse, tap->dev_inuse);
if (wait_event_interruptible(tap->wq, tap->dev_inuse != inuse))
break;
}
clear_bit(BLKTAP_SHUTDOWN_REQUESTED, &tap->dev_inuse);
if (tap->dev_inuse == (1UL << BLKTAP_CONTROL)) {
err = 0;
clear_bit(BLKTAP_CONTROL, &tap->dev_inuse);
}
return err;
}
static long
blktap_ring_ioctl(struct file *filp,
unsigned int cmd, unsigned long arg)
{
struct blktap *tap = filp->private_data;
struct blktap_ring *ring = &tap->ring;
void __user *ptr = (void *)arg;
int err;
BTDBG("%d: cmd: %u, arg: %lu\n", tap->minor, cmd, arg);
if (!ring->vma || ring->vma->vm_mm != current->mm)
return -EACCES;
switch(cmd) {
case BLKTAP_IOCTL_RESPOND:
blktap_read_ring(tap);
return 0;
case BLKTAP_IOCTL_CREATE_DEVICE_COMPAT: {
struct blktap_device_info info;
struct blktap2_params params;
if (copy_from_user(¶ms, ptr, sizeof(params)))
return -EFAULT;
info.capacity = params.capacity;
info.sector_size = params.sector_size;
info.flags = 0;
err = blktap_device_create(tap, &info);
if (err)
return err;
if (params.name[0]) {
strncpy(tap->name, params.name, sizeof(params.name));
tap->name[sizeof(tap->name)-1] = 0;
}
return 0;
}
case BLKTAP_IOCTL_CREATE_DEVICE: {
struct blktap_device_info __user *ptr = (void *)arg;
struct blktap_device_info info;
unsigned long mask;
size_t base_sz, sz;
mask = BLKTAP_DEVICE_FLAG_RO;
mask |= BLKTAP_DEVICE_FLAG_PSZ;
mask |= BLKTAP_DEVICE_FLAG_FLUSH;
mask |= BLKTAP_DEVICE_FLAG_TRIM;
mask |= BLKTAP_DEVICE_FLAG_TRIM_RZ;
memset(&info, 0, sizeof(info));
sz = base_sz = BLKTAP_INFO_SIZE_AT(flags);
if (copy_from_user(&info, ptr, sz))
return -EFAULT;
if ((info.flags & BLKTAP_DEVICE_FLAG_PSZ) != 0)
sz = BLKTAP_INFO_SIZE_AT(phys_block_offset);
if (info.flags & BLKTAP_DEVICE_FLAG_TRIM)
sz = BLKTAP_INFO_SIZE_AT(trim_block_offset);
if (sz > base_sz)
if (copy_from_user(&info, ptr, sz))
return -EFAULT;
if (put_user(info.flags & mask, &ptr->flags))
return -EFAULT;
return blktap_device_create(tap, &info);
}
case BLKTAP_IOCTL_REMOVE_DEVICE:
return blktap_device_destroy(tap);
}
return -ENOTTY;
}