validate_version(9)

💅 validate_version(9) 💅

okay so bestie, welcome to validate_version(9) from the Kernel API Manual — yes we're literally in the kernel docs, main character energy only 🫶

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✨ NAME ✨

validate_version — the vibe check for versions, fr fr. It checks whether a version matches an expected version. no cap 💅

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🌸 SYNOPSIS 🌸

int validate_version (struct version_number expected_version ,
                      struct version_number actual_version ,
                      const char *component_name );

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🎀 ARGUMENTS 🎀

• expected_version — the version you wanted to see. the blueprint. the dream. the one it's supposed to match 💖
• actual_version — the version you actually got. the one currently being validated. the "we have version at home" version 😭
• component_name — the name of the component, or the name of the calling function. it's for error logging, so when things go wrong the log actually tells you who did this 🙈 iykyk

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🦋 DESCRIPTION 🦋

If they don't match, it logs an error describing the mismatch. that's it. that's the whole thing. it's giving "tiny function, huge responsibility" 👑

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⭐ RETURN ⭐

• VDO_SUCCESS — if the versions are the same. slay, we ate, everything is iconic ✨
• VDO_UNSUPPORTED_VERSION — if the versions don't match. not slay. the mismatch got logged, go read it 💀

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🌈 SEE ALSO 🌈

this is the friend group, the whole squad, the entire dm-vdo cinematic universe — all of them live in the kernel file ./drivers/md/dm-vdo/encodings.c 🧚

• vdo_validate_header(9)
• decode_volume_geometry(9)
• vdo_encode_volume_geometry(9)
• vdo_parse_geometry_block(9)
• vdo_compute_new_forest_pages(9)
• encode_recovery_journal_state_7_0(9)
• decode_recovery_journal_state_7_0(9)
• vdo_get_journal_operation_name(9)
• encode_slab_depot_state_2_0(9)
• decode_slab_depot_state_2_0(9)
• vdo_configure_slab_depot(9)
• vdo_configure_slab(9)
• vdo_decode_slab_journal_entry(9)
• allocate_partition(9)
• make_partition(9)
• vdo_initialize_layout(9)
• vdo_uninitialize_layout(9)
• vdo_get_partition(9)
• vdo_get_known_partition(9)
• pack_vdo_config(9)
• pack_vdo_component(9)
• unpack_vdo_config(9)
• unpack_vdo_component_41_0(9)
• decode_vdo_component(9)
• vdo_validate_config(9)
• vdo_destroy_component_states(9)
• decode_components(9)
• vdo_decode_component_states(9)
• vdo_validate_component_states(9)
• vdo_encode_component_states(9)
• vdo_encode_super_block(9)
• vdo_decode_super_block(9)
• vdo_initialize_component_states(9)
• vdo_compute_index_blocks(9)
• vdo_initialize_volume_geometry(9)

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and that's the whole page bestie, go validate some versions 🌸

this came out of ./drivers/md/dm-vdo, dated October 2026 — mwah, xoxo, don't forget to read the error logs 🫶💜