sd_open(9)

💅 sd_open(9) — like, the Kernel API Manual edition 🎀

okay bestie, sit down, we're doing kernel SCSI disk stuff today and honestly? it's giving main character energy in ./drivers/scsi. this is the page for sd_open, and yes it's exactly what it sounds like — opening a scsi disk device. no cap. 🦋

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✨ NAME ✨

sd_open — open a scsi disk device 🌸

✨ SYNOPSIS ✨

int sd_open (struct gendisk *disk , blk_mode_t mode );

✨ ARGUMENTS ✨

• disk — the disk you wanna open, obviously 🫶
• mode — the open mode, iykyk

✨ DESCRIPTION ✨

So like, it returns 0 if everything slays ✨ — success, we're in. And if something goes wrong? it returns a negated errno value. literally a negative number. read that again. ngl that's the whole description, it's a short one, we love a low-effort icon 💅

💀 NOTE 💀

okay this part matters, pay attention:

This can be called from a user context (e.g. fsck(1)) or from within the kernel (e.g. as a result of a mount(1)). In that latter case — the kernel one — inode and filp carry an abridged amount of information as noted above. abridged!! like, they showed up with the cliffnotes version 😭

Locking: called with disk->open_mutex held. 🔒 do NOT forget the mutex bestie, I'm begging you.

🌈 SEE ALSO 🌈

Kernel file ./drivers/scsi/sd.c — and the whole friend group, fr fr:

• sd_group_number(9)
• sd_release(9)
• sd_ioctl(9)
• sd_check_events(9)
• sd_eh_reset(9)
• sd_eh_action(9)
• sd_done(9)
• sd_read_block_provisioning(9)
• sd_read_cpr(9)
• sd_revalidate_disk(9)
• sd_unlock_native_capacity(9)
• sd_format_disk_name(9)
• sd_probe(9)
• sd_remove(9)
• init_sd(9)
• exit_sd(9)

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and that's the whole page, periodt 👑 this little gem lives over in ./drivers/scsi (yes, that's the source/version line, I see you checking) and it's stamped October 2026 — a future icon, literally ahead of its time ⭐💜 go forth and open some disks responsibly 🧚🍓