scsilun_to_int(9)

💅 scsilun_to_int(9) — like, the kernel API manual bestie ✨

okay so real talk, this one lives in section 9 of the kernel API manual and it's called scsilun_to_int — say that five times fast, I dare you 🫶

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🌸 NAME 🌸

scsilun_to_int — converts a scsi_lun into an int, that's literally the whole gig 💖

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✨ SYNOPSIS ✨

u64 scsilun_to_int (struct scsi_lun *scsilun );

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🎀 ARGUMENTS 🎀

• scsilun — the struct scsi_lun that's about to get converted. that's the one, that's our girl 🌈

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🦋 DESCRIPTION 🦋

So here's the vibe: it takes scsilun, converts it out of a struct scsi_lun and into a four-byte host byte-ordered integer, then hands you back the result. iconic behaviour, no notes 👑

⚠️ but bestie, listen — the caller must check for truncation before using this function. do not skip the vibe check on this one, fr fr 😭

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💀 NOTES 💀

For a description of the LUN format: post SCSI-3, go look at the SCSI Architecture Model; for SCSI-3, go look at the SCSI Controller Commands. iykyk 📚

Given a struct scsi_lun of:

d2 04 0b 03 00 00 00 00

this function returns the integer:

0x0b03d204

like… the way it just flips it around? obsessed 🌀✨

Also, this encoding will return a standard integer LUN for LUNs smaller than 256, which typically use a single level LUN structure with addressing method 0. lowkey neat 🌸

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🔥 SEE ALSO 🔥

• Kernel file ./drivers/scsi/scsi_common.c
• scsi_device_type(9)
• int_to_scsilun(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)

go read them, they're all in the group chat 🫶💜

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mwah 💋 this little page comes straight out of ./drivers/scsi, dated October 2026, and it goes by scsilun_to_int(9) — stay slay, stay byte-ordered, and remember to check for truncation 💅🎀