queue_limits_stack_bdev(9)

queue_limits_stack_bdev(9) 💅 — a Kernel API Manual page ✨

okay so bestie, this is the whole page for queue_limits_stack_bdev from the Kernel API Manual — and yes, it's giving “stacked devices need compatible block sizes and alignments” energy. no cap. 🫶

🌸 NAME 🌸

queue_limits_stack_bdev — adjust queue_limits for stacked devices 💖

✨ SYNOPSIS ✨

void queue_limits_stack_bdev (struct queue_limits *t , struct
       block_device *bdev , sector_t offset , const char *pfx );

💅 ARGUMENTS 💅

• t — the stacking driver limits (top device). this is the top-level queue_limits struct your stacking driver hands over, bestie 👑
• bdev — the underlying block device (bottom). the block device underneath, the bottom-device main character 🦋
• offset — offset to beginning of data within component device. literally where the data starts inside the component device, no cap 📏
• pfx — prefix to use for warnings logged. the little prefix string that gets slapped on warnings when they’re logged 🎀

🦋 DESCRIPTION 🦋

okay so this function is used by stacking drivers like MD and DM to make sure all component devices have compatible block sizes and alignments. fr fr, that’s the whole assignment. 💖

the stacking driver must provide a queue_limits struct (top), and then it iteratively calls the stacking function for all component (bottom) devices. the stacking function will attempt to combine the values and ensure proper alignment. it’s giving “merge the vibes, keep the alignment correct” ✨

🔥 SEE ALSO 🔥

• Kernel file ./block/blk-settings.c
• blk_set_stacking_limits(9)
• queue_limits_commit_update(9)
• queue_limits_commit_update_frozen(9)
• queue_limits_set(9)
• blk_stack_limits(9)
• queue_limits_stack_integrity(9)
• blk_set_queue_depth(9)

mwah 💋 — source path ./block, date October 2026, and the page is queue_limits_stack_bdev(9). that’s the footer, folded into a cute lil bye. slay. 🌈