PROBE::NFS.PROC.(3stap)

💖 PROBE::NFS.PROC.(3stap) — bestie's guide to the NFS proc commit probe 💖

okay so real talk, we're in the Network File Storage Tapsets section of the SystemTap tapset reference, and today's main character is a probe point that is honestly kinda retired. let's get into it 🫶

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✨ NAME ✨

probe::nfs.proc.commit — NFS client committing data on server 💅

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🌸 SYNOPSIS 🌸

probe nfs.proc.commit {}

that's it. that's the whole synopsis. she's short, she's sweet, she takes no arguments 🎀

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🦋 VALUES 🦋

these are the local variables you get to peek at inside the probe handler. grab your little notebook bestie 📓✨

• version — the NFS version. which flavor of NFS are we even dealing with, iykyk 💜
• offset — the file offset. where in the file we're at fr fr
• bitmask1 — a V4 bitmask representing the set of attributes supported on this filesystem
• bitmask0 — a V4 bitmask representing the set of attributes supported on this filesystem (yes bestie, it's the same description as bitmask1, I'm not making that up, that's just how the page is written 😭)
• prot — transfer protocol 🔥
• size — read bytes in this execution 👑
• server_ip — IP address of server 🌈

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💀 DESCRIPTION 💀

okay so here's the tea, and it's a little sad ngl.

All the nfs.proc.commit kernel functions were removed in kernel commit 200baa in December 2006, so these probes do not exist on Linux 2.6.21 and newer kernels. gone. retired. iconic but unavailable 😭

so if you're on anything modern, this probe is a ghost. don't be out here trying to attach to it and then wondering why nothing happens, bestie 💀

now for what it did do back in the day:

It fires when the client writes the buffered data to disk. the buffered data is asynchronously written by the client earlier, so the vibe is: client already sent stuff off into the void, and now it's finally getting flushed down. the commit function works in a sync way, so the commit itself is the part that waits and confirms. and one more lil thing — this probe point does not exist in NFSv2. so jot that down 📝✨

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🎀 SEE ALSO 🎀

• tapset::nfs_proc(3stap)

go read that one next, it's giving supportive best friend energy 🫶

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SystemTap Tapset Reference, Ver, September 2026 — that's the whole footer bestie, so consider this your cute lil sign-off: mwah 💋 go probe something that still exists, ily, bye! 💖✨🎀🦋🌸