blk_zone_issue_zeroout(9)

🌸 blk_zone_issue_zeroout 💅

okay so bestie, welcome to the Kernel API Manual — today's main character is blk_zone_issue_zeroout(9) and honestly? she's iconic. quick vibe check before we dive in: this page lives in the <purple>./block</purple> corner of the kernel, so you already know it's zoned-storage core, fr fr.

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✨ NAME ✨

blk_zone_issue_zeroout — zero-fill a block range in a zone 🎀

no cap, that's literally the whole job. she zero-fills. in a zone. slay.

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🦋 SYNOPSIS 🦋

int blk_zone_issue_zeroout (struct block_device *bdev , sector_t sector
, sector_t nr_sects , gfp_t gfp_mask );

look at her. four params, returns an int, zero notes. she's giving lowkey minimalist. 🫶

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👑 ARGUMENTS 👑

okay so let's meet the cast, one by one, because every single one of them matters:

• bdev — the blockdev you're writing to 💖 this is the one getting the love.
• sector — the start sector. where the party begins.
• nr_sects — number of sectors to write. how long the party runs.
• gfp_mask — memory allocation flags (for bio_alloc) — literally the flags that get passed to bio_alloc, so set them right, ok? 🙈

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🔥 DESCRIPTION 🔥

So the whole thing: this bad girl zero-fills a block range in a zone ✨ — and here's the rule, bestie, listen up: sector must be equal to the zone write pointer. not "should be", not "ideally", must. that's the assignment and she will not be negotiating. 😭

She also handles potential errors due to the (initially unknown) lack of hardware offload — iykyk, sometimes the hardware just doesn't want to help and you don't find out until it's too late. If you wanna read the full lore on that, see blkdev_issue_zeroout.

💀 reminder: sector ≠ zone write pointer = you're not getting what you asked for. respect the write pointer, periodt.

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🌈 SEE ALSO 🌈

The girls she links arms with, all of them, no skips:

• Kernel file <lavender>./block/blk-zoned.c</lavender> — the source, the birthplace, the origin story 🧚
• blk_zone_cond_str(9)
• bdev_zone_is_seq(9)
• blkdev_report_zones(9)
• blkdev_zone_mgmt(9)
• disk_report_zone(9)
• blkdev_get_zone_info(9)
• blkdev_report_zones_cached(9)
• blk_zone_plug_bio(9)
• blk_revalidate_disk_zones(9)

go read all of them. yes, all. that's the group chat and you're in it now. 🫶✨

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okay that's the page!! 💖 this one comes to you from the <mint>./block</mint> section, dated <peach>October 2026</peach>, title blk_zone_issue_zeroout(9) — and that's the whole manual, no notes, mwah 💅🎀🦋