ceph_find_incompatible(9)

💅 ceph_find_incompatible(9) — like, the whole vibe

okay bestie, so we're in the Kernel API Manual today and this page is literally called ceph_find_incompatible(9). it's giving "niche kernel lore" and honestly? i'm obsessed. let's get into it 🫶

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✨ NAME ✨

ceph_find_incompatible — find an incompatible context and return it, no cap 💅

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🌸 SYNOPSIS 🌸

struct ceph_snap_context * ceph_find_incompatible (struct folio *folio
);

(pookie the line break is literally in the original, don't come for me 😭)

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🎀 ARGUMENTS 🎀

• folio — the folio being dirtied. yeah. that one. the folio in question ✨

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🦋 DESCRIPTION 🦋

okay so here's the tea ☕ — we are only allowed to write into/dirty a folio if the folio is clean, or already dirty within the same snap context. that's the rule, that's the vibe check, no exceptions.

so what does this function return? glad you asked, bestie:

• a conflicting context if there is one 🔥
• NULL if there isn't 🌈
• or a negative error code on other errors 💀

⚠️ and this is the important part, don't skip it: this must be called with the folio lock held. like, held held. do not come in here unlocked, i'm begging 🙈

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👑 SEE ALSO 👑

• Kernel file ./fs/ceph/addr.c — go read it, iykyk 🧚

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and that's the page, bestie!! this gem lives under ./fs/ceph, dated October 2026, in the Kernel API Manual — mwah, slay, periodt 💖✨🎀