lazlo:~# modprobe -l | grep dm
/lib/modules/2.6.18-4-amd64/kernel/drivers/md/dm-crypt.ko
/lib/modules/2.6.18-4-amd64/kernel/drivers/md/dm-multipath.ko
/lib/modules/2.6.18-4-amd64/kernel/drivers/md/dm-zero.ko
/lib/modules/2.6.18-4-amd64/kernel/drivers/md/dm-snapshot.ko
/lib/modules/2.6.18-4-amd64/kernel/drivers/md/dm-mirror.ko
/lib/modules/2.6.18-4-amd64/kernel/drivers/md/dm-mod.ko
/lib/modules/2.6.18-4-amd64/kernel/drivers/md/dm-round-robin.ko
/lib/modules/2.6.18-4-amd64/kernel/drivers/md/dm-emc.ko
/lib/modules/2.6.18-4-amd64/kernel/drivers/net/tulip/dmfe.ko
/lib/modules/2.6.18-4-amd64/kernel/drivers/usb/misc/idmouse.ko
/lib/modules/2.6.18-4-amd64/kernel/drivers/infiniband/core/rdma_cm.ko
/lib/modules/2.6.18-4-amd64/kernel/drivers/scsi/dmx3191d.ko
/lib/modules/2.6.18-4-amd64/kernel/drivers/scsi/pdc_adma.ko
/lib/modules/2.6.18-4-amd64/kernel/drivers/dma/ioatdma.ko
/lib/modules/2.6.18-4-amd64/kernel/drivers/hwmon/adm1026.ko
/lib/modules/2.6.18-4-amd64/kernel/drivers/hwmon/adm9240.ko
/lib/modules/2.6.18-4-amd64/kernel/drivers/hwmon/adm1025.ko
/lib/modules/2.6.18-4-amd64/kernel/drivers/hwmon/adm1031.ko
/lib/modules/2.6.18-4-amd64/kernel/drivers/hwmon/adm1021.ko
/lib/modules/2.6.18-4-amd64/kernel/drivers/isdn/hardware/avm/b1dma.ko
lazlo:~# modinfo dm-mod
filename:       /lib/modules/2.6.18-4-amd64/kernel/drivers/md/dm-mod.ko
description:    device-mapper driver
author:         Joe Thornber <dm-devel@redhat.com>
license:        GPL
vermagic:       2.6.18-4-amd64 SMP mod_unload gcc-4.1
depends:
parm:           major:The major number of the device mapper (uint)
lazlo:~#