On 8/28/25 5:05 PM, Tobias Waldekranz wrote:
> Modeled on dmsetup(8) from LVM2.
>
> This lets the user create/remove arbitrary dm devices using the same
> table file format used in Linux, and dump information about currently
> configured devices.
>
> Signed-off-by: Tobias Waldekranz <[email protected]>
> ---
> commands/Kconfig | 14 +++++
> commands/Makefile | 1 +
> commands/dmsetup.c | 145 +++++++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 160 insertions(+)
> create mode 100644 commands/dmsetup.c
>
> diff --git a/commands/Kconfig b/commands/Kconfig
> index 1626912c30..219f626c3e 100644
> --- a/commands/Kconfig
> +++ b/commands/Kconfig
> @@ -732,6 +732,20 @@ config CMD_PARTED
> unit <unit> change display/input units
> refresh refresh a partition table
>
> +config CMD_DMSETUP
> + tristate
> + depends on DM_BLK
> + prompt "dmsetup"
> + help
> + dmsetup - low level interface to the device mapper
> +
> + Compose virtual block devices from a table of mappings from
> + logical block addresses to various data sources, such as
> + linear ranges from other existing devices.
> +
> + commands:
> + create <name> <table-file>
> +
> config CMD_UBI
> tristate
> default y if MTD_UBI
> diff --git a/commands/Makefile b/commands/Makefile
> index d9403b18d5..6b010fe30c 100644
> --- a/commands/Makefile
> +++ b/commands/Makefile
> @@ -166,4 +166,5 @@ obj-$(CONFIG_CMD_STACKSMASH) += stacksmash.o
> obj-$(CONFIG_CMD_PARTED) += parted.o
> obj-$(CONFIG_CMD_EFI_HANDLE_DUMP) += efi_handle_dump.o
> obj-$(CONFIG_CMD_HOST) += host.o
> +obj-$(CONFIG_CMD_DMSETUP) += dmsetup.o
> UBSAN_SANITIZE_ubsan.o := y
> diff --git a/commands/dmsetup.c b/commands/dmsetup.c
> new file mode 100644
> index 0000000000..722aa6cbf0
> --- /dev/null
> +++ b/commands/dmsetup.c
> @@ -0,0 +1,145 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +// SPDX-FileCopyrightText: © 2025 Tobias Waldekranz <[email protected]>,
> Wires
> +
> +#include <command.h>
> +#include <common.h>
> +#include <dm.h>
> +#include <libfile.h>
> +
> +static struct dm_device *dmsetup_find(const char *name)
> +{
> + struct dm_device *dm;
> +
> + dm = dm_find_by_name(name);
> + if (IS_ERR_OR_NULL(dm)) {
> + pr_err("Found no device named \"%s\"\n", name);
pr_/dev_ is logged, so will also be shared with Linux if pstore/ramoops
is enabled. For commands, just use printf.
> + return NULL;
> + }
> +
> + return dm;
> +}
> + dm = dm_create(argv[0], table);
> + free(table);
> + if (IS_ERR_OR_NULL(dm)) {
> + pr_err("Failed to create %s: %s\n",
> + argv[0], strerror(-PTR_ERR(dm)));
%pe and pass dm directly.
> + return COMMAND_ERROR;
> + }
> +
> + pr_info("Created %s\n", argv[0]);
> + return COMMAND_SUCCESS;
> +}
> +
> +static int do_dmsetup(int argc, char *argv[])
> +{
> + const char *cmd;
> +
> + if (argc < 2)
> + return COMMAND_ERROR_USAGE;
> +
> + cmd = argv[1];
> + argc -= 2;
> + argv += 2;
> +
> + if (!strcmp(cmd, "create"))
> + return dmsetup_create(argc, argv);
> + else if (!strcmp(cmd, "info"))
> + return dmsetup_info(argc, argv);
> + else if (!strcmp(cmd, "remove"))
> + return dmsetup_remove(argc, argv);
> +
> + printf("Unknown command: %s\n", cmd);
> + return -EINVAL;
> +}
> +
> +BAREBOX_CMD_HELP_START(dmsetup)
> +BAREBOX_CMD_HELP_TEXT("dmsetup - low level interface to the device mapper")
> +BAREBOX_CMD_HELP_TEXT("")
> +BAREBOX_CMD_HELP_TEXT("Compose virtual block devices from a table of
> mappings from")
> +BAREBOX_CMD_HELP_TEXT("logical block addresses to various data sources, such
> as")
> +BAREBOX_CMD_HELP_TEXT("linear ranges from other existing devices.")
> +BAREBOX_CMD_HELP_TEXT("")
> +BAREBOX_CMD_HELP_TEXT("commands:")
> +BAREBOX_CMD_HELP_OPT("create <name> <table-file>", "Create new device")
> +BAREBOX_CMD_HELP_OPT("info [<name>]", "Show device information")
> +BAREBOX_CMD_HELP_OPT("remove <name>", "Remove device")
> +BAREBOX_CMD_HELP_END
Nice. FYI, if selftest is too cumbersome once you start adding more
targets, you can also add tests that exercise commands via pytest. See
test/py/.
Cheers,
Ahmad
> +
> +BAREBOX_CMD_START(dmsetup)
> + .cmd = do_dmsetup,
> + BAREBOX_CMD_DESC("low level interface to the device mapper")
> + BAREBOX_CMD_OPTS("<command> [args...]")
> + BAREBOX_CMD_GROUP(CMD_GRP_PART)
> + BAREBOX_CMD_HELP(cmd_dmsetup_help)
> +BAREBOX_CMD_END
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