PROBE::NFS.FOP.R(3stap)

💖 PROBE::NFS.FOP.R 💖

okay so this is a page from the Network File Storage Tapsets section of the SystemTap Tapset Reference, section 3stap, and it's all about one lil probe. bestie, we're talking probe::nfs.fop.read_iter — the NFS client read_iter file operation. it's giving "let me peek at what happens when somebody reads a file over NFS" ✨

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🌸 NAME 🌸

probe::nfs.fop.read_iter — the NFS client read_iter file operation, periodt. that's the whole name, no notes 💅

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🦋 SYNOPSIS 🦋

probe nfs.fop.read_iter {}

yep, that's it. no arguments, no fuss, just vibes. the probe takes an empty parameter list and she slays 🎀

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⭐ VALUES ⭐

these are all the values this probe hands you, and ngl every single one of them is important, so let's go one by one 🫶

• attrtimeo — how long the cached info is assumed to be valid. we need to revalidate the cached attrs for this inode if jiffies - read_cache_jiffies > attrtimeo. so basically it's the "is my cache still trustworthy" deadline, and it matters 😭
• dev — device identifier
• ino — inode number
• cache_valid — cache related bit mask flag
• file_name — file name
• pos — current position of file
• parent_name — parent dir name
• cache_time — when we started read-caching this inode
• count — read bytes

lowkey a whole little receipt of what the read was doing 🔥

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👑 SEE ALSO 👑

• tapset::nfs(3stap)

go read that one too, iykyk 💜

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and that's the whole page bestie, no cap. this was SystemTap Tapset Reference, version Ver, dated September 2026 — shoutout to the September 2026 era for coming through with the docs 🌈🎀💖 bye ily, go read some NFS tapsets ✨