nfs42_copy_dest_done(9)

💅 nfs42_copy_dest_done — like, the Kernel API Manual one 🦋

okay bestie, so this page lives in the Kernel API Manual (section 9, the kernel-functions girlies ✨), and it's all about what happens after a clone or copy offload has already landed. the cleanup era. the "now go tell everyone" era. 🎀

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✨ NAME ✨

nfs42_copy_dest_done — perform inode cache updates after clone/copy offload 🫶

like literally, it's the little function that does the tidy-up once a copy/clone offload is done. it's giving "you did the thing, now let me fix the cache so nobody's confused." 💅

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🌸 SYNOPSIS 🌸

void nfs42_copy_dest_done (struct file *file , loff_t pos , loff_t len ,
loff_t oldsize );

no return value, nothing to check, she just does the vibes and leaves. 💀 ✨

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💖 ARGUMENTS 💖

• file — pointer to the destination file. the main character of this whole operation, the one getting the copy. 👑
• pos — destination offset. like, where in the file we're doing the thing. 📍
• len — copy length. how much we're working with, in bytes. 📏
• oldsize — length of the file prior to clone/copy. the before picture, for the before/after. 🍓

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🔥 DESCRIPTION 🔥

okay so here's the whole plot: this function punches a hole in the inode page cache, so that the NFS client will know to retrieve new data. 🕳️✨ that's the big one — it's basically leaving a note that says "hey, the old stuff in here is stale, go get the fresh stuff."

then it updates the file size if necessary. 🧚

and then — the glow-up final step — it marks the inode as having invalid cached values for:

• change attribute
• ctime
• mtime
• space used

like, all four, marked invalid, simultaneously. no cap, it's a whole vibe check for the cache and the cache failed it on purpose. 😭🔥

lowkey important: the point of invalidating all of that is so the client doesn't trust stale metadata. don't skip the punches, bestie, or you'll be serving up lies. 💀

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🌈 SEE ALSO 🌈

• Kernel file ./fs/nfs/nfs42proc.c
• nfs42_proc_offload_status(9)

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so yeah, that's the page 💜 — the manual name is nfs42_copy_dest_done(9), it comes to you from ./fs/nfs, and the date on it is October 2026. go off, kernel bestie, slay the cache 🎀 🦋 ⭐