bdev_count_inflight(9)

🌸 NAME 🌸

okay so this is bdev_count_inflight(9) from the Kernel API Manual, and bestie it does exactly what it says on the tin: it gets the number of inflight IOs for a block device. 💅✨

🦋 SYNOPSIS 🦋

unsigned int bdev_count_inflight (struct block_device *part );

🎀 ARGUMENTS 🎀

• part — the block device. that's it, that's the whole argument. 🫶

✨ DESCRIPTION ✨

Inflight here means started IO accounting, no cap. For a bio-based block device it's from bdev_start_io_acct, and for an rq-based block device it's from blk_account_io_start. literally the definition, iykyk. 💖

🌈 SEE ALSO 🌈

Kernel file ./block/genhd.c is out here linking the whole friend group:

• __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)
• set_disk_ro(9)

okay bye bestie 💖 source/version is ./block, dated October 2026 — and that's the bdev_count_inflight(9) tea, periodt. 🎀✨