ENUM P9_CACHE_BITS(9)

✨ NAME ✨

okay so this is enum p9_cache_bits — it's the enum that holds all the possible values of ->cache 💅 that's it, that's the whole job, and honestly? iconic.

This page lives in the Kernel API Manual (section 9, the kernel-API girlies) and it's giving "small but mighty" energy. 🎀

🌸 SYNOPSIS 🌸

bestie, here's the whole thing, verbatim, no cap:

enum p9_cache_bits {
    CACHE_NONE ,
    CACHE_FILE ,
    CACHE_META ,
    CACHE_WRITEBACK ,
    CACHE_LOOSE ,
    CACHE_FSCACHE

};

like yes, there's a lil trailing space before those commas and an extra blank line before the closing brace — that's just how she is, we don't judge. 🫶

🦋 Constants 🦋

okay so each of these is one flavor of ->cache, and they are NOT the same vibe, so let's go one by one:

• CACHE_NONE — caches disabled. nothing cached. we're living in the moment, no memories stored. 💀
• CACHE_FILE — file caching, and the window for it is literally open to close. like the cache has a whole lifespan, periodt.
• CACHE_META — meta-data and directory caching ✨ the receipts and the folder structure get remembered.
• CACHE_WRITEBACK — write-back caching for files. writes get to chill before actually landing. highkey a whole strategy.
• CACHE_LOOSE — don't check cache consistency 🙈 we are trusting, we are relaxed, we are not doing the vibe check.
• CACHE_FSCACHE — local persistent caches 👑 the cache that stays, the main character that remembers you after you leave.

💜 SEE ALSO 💜

go read these next, i'm obsessed with all of them:

• Kernel file ./fs/9p/v9fs.h
• enum p9_cache_shortcuts(9)
• struct v9fs_session_info(9)
• v9fs_get_inode_from_fid(9)
• v9fs_get_new_inode_from_fid(9)

okay that's the whole page, you ate that 💖 this one's from ./fs/9p, dated October 2026 — so like, mark your calendar bestie, and go forth and cache responsibly ✨🦋🌈