/**
* Resize disk.
*
* @gd disk.
* @new_size new size [logical block].
*
* RETURN:
* true in success, or false.
*/
bool resize_disk(struct gendisk *gd, u64 new_size)
{
struct block_device *bdev;
u64 old_size;
ASSERT(gd);
old_size = get_capacity(gd);
if (old_size == new_size) {
return true;
}
set_capacity(gd, new_size);
bdev = bdget_disk(gd, 0);
if (!bdev) {
LOGe("bdget_disk failed.\n");
return false;
}
mutex_lock(&bdev->bd_mutex);
if (old_size > new_size) {
LOGn("Shrink disk should discard block cache.\n");
check_disk_size_change(gd, bdev);
/* This should be implemented in check_disk_size_change(). */
bdev->bd_invalidated = 0;
} else {
i_size_write(bdev->bd_inode,
(loff_t)new_size * LOGICAL_BLOCK_SIZE);
}
mutex_unlock(&bdev->bd_mutex);
bdput(bdev);
return true;
}
static void
zvol_size_changed(zvol_state_t *zv, uint64_t volsize)
{
struct block_device *bdev;
bdev = bdget_disk(zv->zv_disk, 0);
if (bdev == NULL)
return;
set_capacity(zv->zv_disk, volsize >> 9);
zv->zv_volsize = volsize;
check_disk_size_change(zv->zv_disk, bdev);
bdput(bdev);
}
/*
* Ensure the zap is flushed then inform the VFS of the capacity change.
*/
static int
zvol_update_volsize(zvol_state_t *zv, uint64_t volsize, objset_t *os)
{
struct block_device *bdev;
dmu_tx_t *tx;
int error;
ASSERT(MUTEX_HELD(&zvol_state_lock));
tx = dmu_tx_create(os);
dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL);
error = dmu_tx_assign(tx, TXG_WAIT);
if (error) {
dmu_tx_abort(tx);
return (error);
}
error = zap_update(os, ZVOL_ZAP_OBJ, "size", 8, 1,
&volsize, tx);
dmu_tx_commit(tx);
if (error)
return (error);
error = dmu_free_long_range(os,
ZVOL_OBJ, volsize, DMU_OBJECT_END);
if (error)
return (error);
bdev = bdget_disk(zv->zv_disk, 0);
if (!bdev)
return (EIO);
/*
* 2.6.28 API change
* Added check_disk_size_change() helper function.
*/
#ifdef HAVE_CHECK_DISK_SIZE_CHANGE
set_capacity(zv->zv_disk, volsize >> 9);
zv->zv_volsize = volsize;
check_disk_size_change(zv->zv_disk, bdev);
#else
zv->zv_volsize = volsize;
zv->zv_changed = 1;
(void) check_disk_change(bdev);
#endif /* HAVE_CHECK_DISK_SIZE_CHANGE */
bdput(bdev);
return (0);
}
static void
zvol_size_changed(zvol_state_t *zv, uint64_t volsize)
{
struct block_device *bdev;
bdev = bdget_disk(zv->zv_disk, 0);
if (bdev == NULL)
return;
/*
* 2.6.28 API change
* Added check_disk_size_change() helper function.
*/
#ifdef HAVE_CHECK_DISK_SIZE_CHANGE
set_capacity(zv->zv_disk, volsize >> 9);
zv->zv_volsize = volsize;
check_disk_size_change(zv->zv_disk, bdev);
#else
zv->zv_volsize = volsize;
zv->zv_changed = 1;
(void) check_disk_change(bdev);
#endif /* HAVE_CHECK_DISK_SIZE_CHANGE */
bdput(bdev);
}
