[RHELMISC-32989] add deviceless message support for capacity queries#100
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Add support for target messages that don't require an active device instance. This allows querying target-specific information without creating a device. Adds dm_deviceless_message_fn typedef and deviceless_message field to struct target_type in device-mapper.h. Modifies dm-ioctl.c to route messages with device name "." to the target's deviceless_message handler. The message format is: dmsetup message . 0 <target-name> <message> [args...] The target name is extracted from argv[0] and the remaining arguments are passed to the target's deviceless_message function. Signed-off-by: Bruce Johnston <bjohnsto@redhat.com>
Add a deviceless message handler to the VDO target that allows querying VDO capacity information without an active device instance. The "capacity" message accepts logical blocks, physical blocks, slab size, index memory, and index sparse parameters, simulates VDO initialization, and returns a structured response with logical blocks, data blocks, max data blocks, slab count, and max slab count. Also adds vdo_compute_logical_blocks() to correctly compute the default logical size by subtracting block map forest overhead from available data blocks. Bumps VDO target version to 9.3.0. Signed-off-by: Bruce Johnston <bjohnsto@redhat.com>
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Add a deviceless message handler to the VDO target that allows querying VDO capacity information without an active device instance. The "capacity" message accepts logical blocks, physical blocks, slab size, index memory, and index sparse parameters, simulates VDO initialization, and returns a structured response with logical blocks, data blocks, max data blocks, slab count, and max slab count.
Also adds vdo_compute_logical_blocks() to correctly compute the default logical size by subtracting block map forest overhead from available data blocks.
Bumps VDO target version to 9.3.0.