set_disk_ro(9)

✨ set_disk_ro — kernel API manual ✨

okay so bestie, welcome to the set_disk_ro(9) page 💅 this is the one that flips a gendisk between "read-only, don't touch" and "read/write, go off" — iconic behavior tbh 🎀

🌸 NAME 🌸

set_disk_ro — set a gendisk read-only

🦋 SYNOPSIS 🦋

void set_disk_ro (struct gendisk *disk , bool read_only );

💖 ARGUMENTS 💖

• disk — the gendisk you're operating on 🫶 like, this is the disk we're doing stuff to.
• read_only — true means set the disk read-only, false means set the disk read/write. two settings, one bool, no cap ✨

🧚 DESCRIPTION 🧚

so what does this actually do? set_disk_ro is the function you use to indicate whether a given disk device should have its read-only flag set. that's the whole vibe check right there 💫

typically, device drivers use set_disk_ro to indicate whether the underlying physical device is write-protected — like, "hey, this thing won't let you write to it," and now the disk knows that too 🔥

👑 SEE ALSO 👑

kernel file ./block/genhd.c plus the whole friend group:

• bdev_count_inflight(9)
• __register_blkdev(9)
• add_disk_fwnode(9)
• device_add_disk(9)
• blk_mark_disk_dead(9)
• del_gendisk(9)
• invalidate_disk(9)
• disk_release(9)
• put_disk(9)

and that's the page, bestie 💜 this one lives in ./block and it's dated October 2026 — so yeah, mark your calendar, the future is calling and it's giving read-only flag energy 🌈⭐ periodt.