netfs_read_single(9)

✨ netfs_read_single ✨

okay bestie, so this is a kernel API manual page — netfs_read_single(9) — and it's literally about synchronously reading a single blob of pages 🎀 yes the whole vibe is "gimme that one chunk, right now, no games."

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🌸 SYNOPSIS 🌸

ssize_t netfs_read_single (struct inode *inode , struct file *file ,
       struct iov_iter *iter );

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💜 ARGUMENTS 💜

• inode — the inode we're reading from, obvi. Your source of truth 🫶
• file — the file we're using to do the read, or NULL. Yes bestie, NULL is allowed, it's giving "optional main character" 💅
• iter — the buffer we're reading into. This is where the data lands ✨

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🦋 DESCRIPTION 🦋

So here's the tea ☕ — this function fulfils a read request for a single monolithic object, and it draws the data from the cache if it can, or from the netfs if it can't. Bestie it's literally trying the cache first like a responsible icon 👑

And listen — the buffer may be larger than the file content. The unused part beyond the EOF? Zero-filled, no cap. So don't be surprised by a lil padding of zeros at the end, it's on purpose 💖

The content gets read with a single I/O request — though yes, this may be retried. One shot (or a couple, if the universe says no the first time) 🔥

⚠️ important caveat bestie: the calling netfs must initialise a netfs context contiguous to the vfs inode before calling this. Like, do that first. Not optional 🙈

This is usable whether or not caching is enabled — it works both ways, versatile queen 🌈 And if caching is enabled? The data will be stored as a single object into the cache. Slay.

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👑 SEE ALSO 👑

• Kernel file ./fs/netfs/read_single.c
• netfs_single_mark_inode_dirty(9)

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ok that's the whole thing, go read some blobs bestie 🍓 byeeee 💜 — this page lives in ./fs/netfs, dated October 2026, and it's from the Kernel API Manual. mwah 😘