ocfs2_resmap_claimed_bits(9)

💖 ocfs2_resmap_claimed_bits(9) 💖

okay so this is a page from the Kernel API Manual, bestie — it's ocfs2_resmap_claimed_bits(9) and it's genuinely one of those little functions that keeps the whole reservation party from falling apart. no cap. 🎀

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✨ NAME ✨

ocfs2_resmap_claimed_bits — the function where you go tell the reservation code that bits were used. that's it, that's the whole vibe. 💅

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🌸 SYNOPSIS 🌸

void ocfs2_resmap_claimed_bits (struct ocfs2_reservation_map *resmap ,
struct ocfs2_alloc_reservation *resv , u32 cstart , u32 clen );

like, look at her. four params, returns nothing, absolute main character energy. 👑

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🦋 ARGUMENTS 🦋

• resmap — the reservations bitmap. this is the whole map, the vibe check headquarters, the thing you're reporting to. 🗺️
• resv — an optional reservation, and if you pass it, it gets recalculated based on the new bitmap. optional!! she doesn't have to be there!! 🫶
• cstart — start of allocation, measured in clusters. 📍
• clen — end of allocation, also in clusters. yep, "len" but it's the end. that's just how she is. 🙈

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💜 DESCRIPTION 💜

so here's the situation: you call this to tell the reservation code that bits were used to fulfill an allocation in resmap. and the bits don't have to have been part of any existing reservation — like, they're allowed to be brand new to the whole thing, no history, no strings. but — and this is the part where you listen — we must always call this function when bits are claimed. always. not "usually", not "when you remember". always. 😭

internally, the reservations code takes this info and uses it to mark the reservations bitmap. slay. and if resv is passed in, its next allocation window will get calculated. she's doing math for you, be grateful. ✨

one more thing, and it's giving "read the docs before you ship": it also expects that cstart is the same as what we passed back from ocfs2_resmap_resv_bits. so like, match your values, bestie. don't be out here freelancing. 💀

fr fr — always call this when bits are claimed, and keep cstart consistent with what ocfs2_resmap_resv_bits handed back. iykyk. 🔥

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🌈 SEE ALSO 🌈

• the kernel file ./fs/ocfs2/reservations.h — go read the header, it's iconic 💖
• ocfs2_resv_discard(9)
• ocfs2_resmap_init(9)
• ocfs2_resmap_restart(9)
• ocfs2_resmap_uninit(9)
• ocfs2_resmap_resv_bits(9)

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and that's the whole page, bestie!! 🎀 this one lives over in ./fs/ocfs2 and the version we're looking at is dated October 2026 — so like, future girlie energy. go forth and claim your bits responsibly. mwah. 💋🦋⭐