vdo_compute_...forest_pages(9)

💅 vdo_compute_new_forest_pages — Kernel API Manual ✨

Okay so bestie, we're in the kernel docs, specifically the vdo_compute_...forest_pages(9) page from the Kernel API Manual, and this one is lowkey a math girlie. Let's get into it 🎀

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✨ NAME ✨

vdo_compute_new_forest_pages — computes the number of pages that have to be allocated at each level so the forest can grow to a new number of entries 🌲💖

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🦋 SYNOPSIS 🦋

block_count_t vdo_compute_new_forest_pages (root_count_t root_count ,
struct boundary *old_sizes , block_count_t entries , struct boundary
*new_sizes );

That's the whole vibe, no cap. Now let's meet the cast 👑

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🌸 ARGUMENTS 🌸

• root_count — the number of block map roots. Like, how many roots we're working with, periodt 🌱
• old_sizes — the sizes of the old tree segments. The before pics 📸
• entries — the new number of entries the block map must address. This is the glow-up target 🎯
• new_sizes — the sizes of the new tree segments. The after pics ✨

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🫶 RETURN 🫶

It hands you back the total number of non-leaf pages required. That's it, that's the answer, slay 💅

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👑 SEE ALSO 👑

Bestie there are so many friends on this list, and they're all in the kernel file ./drivers/md/dm-vdo/encodings.c — every single one, here we go:

• validate_version(9)
• vdo_validate_header(9)
• decode_volume_geometry(9)
• vdo_encode_volume_geometry(9)
• vdo_parse_geometry_block(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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Mwah 💋 that's the page! Sending you off with love from ./drivers/md/dm-vdo, dated October 2026, from your fave vdo_compute_...forest_pages(9) girlie. Go grow that forest, bestie 🌈🌲💜