decode_vdo(9)

🌸 NAME 🌸

okay bestie, welcome to decode_vdo(9) — the kernel API manual entry that’s literally about one job: decode the component data portion of a super block and fill in the corresponding portions of the vdo being loaded. slay, let’s get into it 💖

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✨ SYNOPSIS ✨

int decode_vdo (struct vdo *vdo );

that’s the whole signature, no cap 🫶

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🎀 ARGUMENTS 🎀

• vdo — the vdo being loaded. literally the main character here 💅

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🦋 DESCRIPTION 🦋

okay so this will also allocate the recovery journal and slab depot — yes, both of them, periodt ✨

and if this method is called with an asynchronous layer (i.e. a thread config which specifies at least one base thread), the block map and packer will be constructed as well. iykyk 🧚

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💜 RETURN 💜

it hands back VDO_SUCCESS or an error. that’s it, that’s the vibe check 😭💖

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🔥 SEE ALSO 🔥

Kernel file: ./drivers/md/dm-vdo/dm-vdo-target.c — and the whole squad is here:

• free_device_config(9)
• get_version_number(9)
• parse_bool(9)
• parse_memory(9)
• parse_slab_size(9)
• process_one_thread_config_spec(9)
• parse_one_thread_config_spec(9)
• parse_thread_config_string(9)
• process_one_key_value_pair(9)
• parse_one_key_value_pair(9)
• parse_key_value_pairs(9)
• parse_optional_arguments(9)
• handle_parse_error(9)
• parse_device_config(9)
• get_thread_id_for_phase(9)
• advance_phase(9)
• finish_operation_callback(9)
• decode_from_super_block(9)
• pre_load_callback(9)
• get_bit_array_size(9)
• grow_bit_array(9)
• allocate_instance(9)
• check_may_grow_physical(9)
• grow_layout(9)
• validate_new_device_config(9)
• write_super_block_for_suspend(9)
• suspend_callback(9)
• was_new(9)
• requires_repair(9)
• get_load_type(9)
• load_callback(9)
• handle_load_error(9)
• write_super_block_for_resume(9)
• resume_callback(9)
• grow_logical_callback(9)
• handle_logical_growth_error(9)
• perform_grow_logical(9)
• copy_partition(9)
• grow_physical_callback(9)
• handle_physical_growth_error(9)
• perform_grow_physical(9)
• apply_new_vdo_configuration(9)

okay bye bestie — this iconic little entry lives at ./drivers/md/dm-vdo and is dated October 2026 💖🎀✨