Function vdev_disk_open

freebsd/contrib/openzfs/module/os/linux/zfs/vdev_disk.c:169–330

}

static int
vdev_disk_open(vdev_t *v, uint64_t *psize, uint64_t *max_psize,
    uint64_t *logical_ashift, uint64_t *physical_ashift)
{
	struct block_device *bdev;
	fmode_t mode = vdev_bdev_mode(spa_mode(v->vdev_spa));
	hrtime_t timeout = MSEC2NSEC(zfs_vdev_open_timeout_ms);
	vdev_disk_t *vd;

	/* Must have a pathname and it must be absolute. */
	if (v->vdev_path == NULL || v->vdev_path[0] != '/') {
		v->vdev_stat.vs_aux = VDEV_AUX_BAD_LABEL;
		vdev_dbgmsg(v, "invalid vdev_path");
		return (SET_ERROR(EINVAL));
	}

	/*
	 * Reopen the device if it is currently open.  When expanding a
	 * partition force re-scanning the partition table if userland
	 * did not take care of this already. We need to do this while closed
	 * in order to get an accurate updated block device size.  Then
	 * since udev may need to recreate the device links increase the
	 * open retry timeout before reporting the device as unavailable.
	 */
	vd = v->vdev_tsd;
	if (vd) {
		char disk_name[BDEVNAME_SIZE + 6] = "/dev/";
		boolean_t reread_part = B_FALSE;

		rw_enter(&vd->vd_lock, RW_WRITER);
		bdev = vd->vd_bdev;
		vd->vd_bdev = NULL;

		if (bdev) {
			if (v->vdev_expanding && bdev != bdev_whole(bdev)) {
				bdevname(bdev_whole(bdev), disk_name + 5);
				/*
				 * If userland has BLKPG_RESIZE_PARTITION,
				 * then it should have updated the partition
				 * table already. We can detect this by
				 * comparing our current physical size
				 * with that of the device. If they are
				 * the same, then we must not have
				 * BLKPG_RESIZE_PARTITION or it failed to
				 * update the partition table online. We
				 * fallback to rescanning the partition
				 * table from the kernel below. However,
				 * if the capacity already reflects the
				 * updated partition, then we skip
				 * rescanning the partition table here.
				 */
				if (v->vdev_psize == bdev_capacity(bdev))
					reread_part = B_TRUE;
			}

			blkdev_put(bdev, mode | FMODE_EXCL);
		}