iomap_iter_srcmap(9)

💅 iomap_iter_srcmap — from the Kernel API Manual, bestie

Okay so we're deep in the kernel API docs rn and this one is iomap_iter_srcmap(9) — yes the manual name is literally part of the title, we're keeping it, it's giving official ✨

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🌸 NAME 🌸

iomap_iter_srcmap — bestie, it returns the source map for the current iomap iteration. That's the whole job. Iconic, lowkey.

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🦋 SYNOPSIS 🦋

const struct iomap * iomap_iter_srcmap (const struct iomap_iter *i );

Look at her. Const-correct on both ends. She's not gonna touch your data, she's just gonna look at it respectfully 🫶

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🎀 ARGUMENTS 🎀

• i — the iteration structure. That's it, that's the whole argument list. Just hand her the iter struct and she'll do the rest, no cap.

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💖 DESCRIPTION 💖

So here's the vibe: write operations on file systems with reflink support might need, like, two maps — a source and a destination. Not one. Two. Because reflink is extra like that 💅

This function returns the source map for a given operation. And ngl, that source map may or may not be identical to the destination map sitting in i->iomap — so don't just assume they're the same thing, bestie, check first 🙈

That's literally the whole function. Small, focused, does one thing. Main character energy fr fr ⭐

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🔥 SEE ALSO 🔥

• Kernel file ./include/linux/iomap.h — struct iomap_iter(9), iomap_length_trim(9), iomap_length(9), iomap_iter_advance_full(9), iomap_iter_next(9)

Go read the whole iomap friend group, they're all interconnected and honestly obsessed with each other 🌈

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Sign-off time 🧚 This little beauty lives over in ./include/linux, dated October 2026. Screenshot it, save it, tattoo it on your forearm — whatever helps you remember 💜💖✨