last_lba(9)

okay bestie, welcome to last_lba(9) from the Kernel API Manual 🫶✨ she’s a tiny helper with main-character energy, and here’s the whole vibe.

🌸 NAME 🌸

last_lba — return number of last logical block of device 💅

✨ SYNOPSIS ✨

u64 last_lba (struct gendisk *disk );

🎀 ARGUMENTS 🎀

• disk — block device. that’s the one, bestie 🫶

💖 DESCRIPTION 💖

Returns last LBA value on success, 0 on error. no cap 😭

This is stored (by sd and ide-geometry) in the part[0] entry for this disk, and is the number of physical sectors available on the disk. literally the whole point 💅✨

🦋 SEE ALSO 🦋

Kernel file ./block/partitions/efi.c — plus the whole squad:

• efi_crc32(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)
• efi_partition(9)

source/version line is ./block/partitions, dated October 2026, and this whole thing is the last_lba(9) page. byeee, go read your GPTs 💜🌈