int_to_scsilun(9)

💅 int_to_scsilun(9) — the Kernel API Manual, bestie edition 🎀

okay so picture this: you're deep in the kernel, you've got an int (well, a u64) that used to be a LUN, and you need the actual struct scsi_lun back. that's this function. it's giving "unpacking my emotional baggage" but make it SCSI. ✨

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🌸 NAME 🌸

int_to_scsilun — reverts an int into a scsi_lun. yes literally reverses the vibe. no cap. 💅

🦋 SYNOPSIS 🦋

void int_to_scsilun (u64 lun , struct scsi_lun *scsilun );

🎀 ARGUMENTS 🎀

• lun — the integer that's about to be reverted 🫶 like, it's the number you're un-packing, bestie.
• scsilun — the struct scsi_lun that gets set. this is the glow-up destination.

✨ DESCRIPTION ✨

so scsilun_to_int had one job: pack an 8-byte LUN value into an int. this routine? this routine does the reverse — it unpacks that int right back into the LUN value. it's the undo button. the "jk, come back" of the pair. 😭🔥

it reverts the functionality of scsilun_to_int, periodt. 👑

💀 NOTES 💀

genuinely obsessed with this example, watch:

given an integer: 0x0b03d204

this function returns a struct scsi_lun of:

d2 04 0b 03 00 00 00 00

the way it just... reorders the bytes. main character energy fr fr. 🌈⭐

🧚 SEE ALSO 🧚

• Kernel file ./drivers/scsi/scsi_common.c
• scsi_device_type(9)
• scsilun_to_int(9)
• scsi_normalize_sense(9)
• scsi_sense_desc_find(9)
• scsi_build_sense_buffer(9)
• scsi_set_sense_information(9)
• scsi_set_sense_field_pointer(9)

iykyk — go read the whole friend group. 🫶💖

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and that's the page! source is ./drivers/scsi, dated October 2026 — mwah, slay, go unpack some LUNs responsibly 💅🎀🦋