This series is reviving an old patchwork. Booting from a mapped device requires an initramfs. This series is allows for device-mapper targets to be configured at boot time for use early in the boot process (as the root device or otherwise). Example, the following could be added in the boot parameters. dm="lroot,,,rw, 0 4096 linear 98:16 0, 4096 4096 linear 98:32 0" root=/dev/dm-0 Enric Balletbo i Serra (1): dm ioctl: add a device mapper ioctl function. Will Drewry (1): init: add support to directly boot to a mapped device .../admin-guide/kernel-parameters.rst | 1 + .../admin-guide/kernel-parameters.txt | 3 + Documentation/device-mapper/dm-boot.txt | 63 +++ drivers/md/dm-ioctl.c | 50 ++ include/linux/device-mapper.h | 6 + init/Makefile | 1 + init/do_mounts.c | 1 + init/do_mounts.h | 10 + init/do_mounts_dm.c | 475 ++++++++++++++++++ 9 files changed, 610 insertions(+) create mode 100644 Documentation/device-mapper/dm-boot.txt create mode 100644 init/do_mounts_dm.c -- 2.19.0
