efi_partition(9)

💖 efi_partition(9) — scan for GPT partitions 💖

Welcome to the efi_partition(9) page from the Kernel API Manual, bestie 💅✨ This one is all about scanning for GPT partitions, and it is lowkey iconic.

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🌸 NAME 🌸

efi_partition — scan for GPT partitions 🦋

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✨ SYNOPSIS ✨

int efi_partition (struct parsed_partitions *state );

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🎀 ARGUMENTS 🎀

• state — disk parsed partitions 🫶

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🦋 DESCRIPTION 🦋

Okay so here's the tea: this gets called from check.c. If the disk contains GPT partitions, it sets up partition entries in the kernel. Periodt 💅

If the first block on the disk is a legacy MBR, it will get handled by msdos_partition. If it's a Protective MBR, we'll handle it here. No cap.

We do not create a Linux partition for GPT, but only for the actual data partitions. That part is important, bestie 🎀

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💅 RETURN 💅

• -1 — if unable to read the partition table 😭
• 0 — if this isn't our partition table 🙈
• 1 — if successful 🎉

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🔥 SEE ALSO 🔥

Kernel file: ./block/partitions/efi.c 👑

Also go peek at these icon friends:

• efi_crc32(9)
• last_lba(9)
• is_pmbr_valid(9)
• read_lba(9)
• alloc_read_gpt_entries(9)
• alloc_read_gpt_header(9)
• is_gpt_valid(9)
• is_pte_valid(9)
• compare_gpts(9)
• find_valid_gpt(9)
• utf16_le_to_7bit(9)

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xoxo from efi_partition(9) 💖 — source/version ./block/partitions, date October 2026 🎀