bdev_open(9)

📦 version 7.3.1, in nixpkgs unstable

💖 bdev_open(9) — like, the block device opener, bestie 💖

okay so this is a page straight outta the Kernel API Manual, and the star of the show is bdev_open — she opens block devices. that's it, that's the whole vibe. let's get into it 🎀

✨ SYNOPSIS ✨

int bdev_open (struct block_device *bdev , blk_mode_t mode , void
       *holder , const struct blk_holder_ops *hops , struct file *bdev_file );

literally five whole parameters, she's high maintenance but she delivers 🫶

🌸 ARGUMENTS 🌸

  • bdev — the block device you're tryna open. the main character of this whole function ngl 👑
  • mode — the open mode, and it's giving BLK_OPEN_* energy. those flags are your whole personality here 💅
  • holder — the exclusive holder identifier. if you pass something in here you're basically claiming her, no sharing 😤
  • hops — the holder operations. like, the stuff that comes with holding, yk?
  • bdev_file — the file for the block device. the file-y side of this whole situation 🦋

💫 DESCRIPTION 💫

so. you call this and it opens the block device. periodt.

but here's the tea: if holder is not NULL, the block device gets opened with exclusive access. and before you panic — exclusive opens may nest for the same holder. so the same holder can stack them, it's fine, breathe 🙈✨

⭐ CONTEXT ⭐

Might sleep. 😴 that's it, that's the whole context section. she naps. respect it.

🔥 RETURN 🔥

  • zero on success — slay, we love a clean return 💖
  • -errno on failure — so if it goes wrong you get a negative errno, go look it up iykyk 😭

🎀 SEE ALSO 🎀

Kernel file ./block/bdev.c — that's where the magic lives, go read her fr fr

anyway that's the page!! came from the ./block corner of the kernel tree, dated October 2026, filed under bdev_open(9) — mwah, go open some block devices responsibly bestie 💜🌈✨

📦 where this page comes from