[PATCH v2 0/7] dm: Initial work on a device mapper

[Tobias Waldekranz]

Start work on adding a device mapper that is compatible with the
corresponding subsystem in Linux.

v1:
https://lore.kernel.org/barebox/20250828150637.2222474-1-tobias@waldekranz.com/

v1 -> v2:
- Fix review comments from Ahmad (see individual commits)
- Add (2/7): Add rasprintf(), to make scenarios where strings are
  built up in multiple steps more ergonomic to work with.
- Add (5/7): As a result of making sure that the DM selftests execute
  in the CI suite, the qemu-malta build ran into a table size
  overflow.

Tobias Waldekranz (7):
  string: add strtok/strtokv
  vsprintf: Add rasprintf(): the reallocing string printf family
  dm: Add initial device mapper infrastructure
  dm: linear: Add linear target
  MIPS: qemu-malta_defconfig: Use largest possible relocation table
  test: self: dm: Add test of linear target
  commands: dmsetup: Basic command set for dm device management

 arch/mips/configs/qemu-malta_defconfig |   1 +
 commands/Kconfig                       |  14 +
 commands/Makefile                      |   1 +
 commands/dmsetup.c                     | 144 +++++++++
 drivers/block/Kconfig                  |   2 +
 drivers/block/Makefile                 |   1 +
 drivers/block/dm/Kconfig               |  13 +
 drivers/block/dm/Makefile              |   3 +
 drivers/block/dm/dm-core.c             | 395 +++++++++++++++++++++++++
 drivers/block/dm/dm-linear.c           | 129 ++++++++
 drivers/block/dm/dm-target.h           |  39 +++
 include/device-mapper.h                |  16 +
 include/stdio.h                        |  10 +
 include/string.h                       |   1 +
 include/xfuncs.h                       |   4 +
 lib/string.c                           |  30 ++
 lib/vsprintf.c                         |  35 +++
 lib/xfuncs.c                           |  24 ++
 test/self/Kconfig                      |  10 +
 test/self/Makefile                     |   1 +
 test/self/dm.c                         | 159 ++++++++++
 21 files changed, 1032 insertions(+)
 create mode 100644 commands/dmsetup.c
 create mode 100644 drivers/block/dm/Kconfig
 create mode 100644 drivers/block/dm/Makefile
 create mode 100644 drivers/block/dm/dm-core.c
 create mode 100644 drivers/block/dm/dm-linear.c
 create mode 100644 drivers/block/dm/dm-target.h
 create mode 100644 include/device-mapper.h
 create mode 100644 test/self/dm.c

-- 
2.43.0