validate_new_device_config(9)

💅 validate_new_device_config(9) — a Kernel API Manual moment ✨

okay so bestie, welcome to the validate_new_device_config page, straight out of the Kernel API Manual. she's a little function with a big job and honestly? she ate. let's get into it 🎀

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🌸 NAME 🌸

validate_new_device_config — check whether a new device config represents a valid modification to an existing config.

like, is this new config actually allowed to happen, or is it giving chaos? that's the whole vibe check. 🦋

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✨ SYNOPSIS ✨

int validate_new_device_config (struct device_config *to_validate ,
struct device_config *config , bool may_grow , char **error_ptr );

yep, that's a int return, four arguments, and she's not messing around. 💅

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💖 ARGUMENTS 💖

• to_validate — the new config we're checking. this is the main character of the operation, the one getting scrutinized 🔍
• config — the existing config. the baseline, the reference point, the "we were already here" energy 👑
• may_grow — set to true if growing the logical and physical size of the vdo is currently permitted. if it's false, bestie, no growing. periodt. 🌱
• error_ptr — a pointer to hold the reason for any error. so if something goes wrong, this is where the why lives 😭

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🦋 RETURN 🦋

VDO_SUCCESS or an error.

that's it. that's the whole mood. either we slay or we don't 💀

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🌈 SEE ALSO 🌈

okay this list is long, but every single one of these is invited to the group chat:

• 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)
• decode_vdo(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)
• 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)

also the kernel file lives at ./drivers/md/dm-vdo/dm-vdo-target.c, so if you wanna go read the source, that's where she resides 🫶

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lowkey reminder: this is kernel code, so the details matter a lot. no cap. don't go renaming flags or assuming behavior, okay? iykyk 💜

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and that's the page, bestie ✨ this one's from ./drivers/md/dm-vdo, dated October 2026, and it's literally called validate_new_device_config(9) — iconic, no notes 💅🎀