ocfs2_resmap_resv_bits(9)

💅 ocfs2_resmap_resv_bits 💅

okay so bestie, this is a page straight out of the Kernel API Manual (that's section 9, the kernel dev section, iykyk) and it's all about ocfs2_resmap_resv_bits — a lil' function that hands you back reservation bits that are still valid. that's literally the whole vibe. 🦋

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✨ NAME ✨

ocfs2_resmap_resv_bits — returns still-valid reservation bits. that's it, that's the job, and it does it slayfully 💅

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🎀 SYNOPSIS 🎀

int ocfs2_resmap_resv_bits (struct ocfs2_reservation_map *resmap ,
struct ocfs2_alloc_reservation *resv , int *cstart , int *clen );

she takes four things and gives you back an int, no cap. ✨

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🌸 ARGUMENTS 🌸

• resmap — the reservations bitmap. think of it as the group chat where all the reservation gossip lives. 💬
• resv — the reservation you're basing your search from, aka the starting point of the whole quest. 🗺️
• cstart — start of the proposed allocation. where you wanna begin, bestie. 📍
• clen — length of the proposed allocation, measured in clusters (clusters!! not bytes, keep up 💀). 📏

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🔥 DESCRIPTION 🔥

okay so here's the tea 🍓: using the reservation data from resv, this function compares resmap against resmap->m_disk_bitmap to figure out what part — if any — of the reservation window is still clear to use. like, is there room? is it free? let's find out. 🔍

and if resv is empty? no problem, she's got you — this function will try to allocate a window for it. main character energy, honestly. 👑

on success, zero is returned and the valid allocation area gets set into cstart and clen. 🎉

but watch out — it returns -ENOSPC if reservations are disabled. so if you get that back, that's your sign the reservation party isn't happening. 😭

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🌈 SEE ALSO 🌈

• kernel file ./fs/ocfs2/reservations.h (go read it, bestie 📖)
• ocfs2_resv_discard(9)
• ocfs2_resmap_init(9)
• ocfs2_resmap_restart(9)
• ocfs2_resmap_uninit(9)
• ocfs2_resmap_claimed_bits(9)

the whole friend group, fr fr 🫶

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and that's the page!! 💖 this one's served up from ./fs/ocfs2, dated October 2026, and it lives at ocfs2_resmap_resv_bits(9) — so like, cite her properly, mwah 💋✨