STRUCT READAHEAD_CONTROL(9)

📦 version 7.3.1, in nixpkgs unstable

🌸 struct readahead_control(9) 🌸

okay so bestie, this one is from the Kernel API Manual — the manual — and it's all about struct readahead_control, which literally describes a readahead request. no cap, that's the whole NAME vibe. 💅

✨ NAME ✨

struct readahead_control — Describes a readahead request. periodt.

🎀 SYNOPSIS 🎀

Here's the struct in all its main-character glory:

       struct readahead_control {
           struct file *file;
           struct address_space *mapping;
           struct file_ra_state *ra;
        };

💅 Members 💅

  • file — the file, used primarily by network filesystems for authentication. It may be NULL if invoked internally by the filesystem.
  • mapping — Readahead this filesystem object. yes bestie, that is the note, keep it moving. 💖
  • ra — file readahead state. It may be NULL.

🦋 Description 🦋

A readahead request is for consecutive pages. Filesystems which implement the ->readahead method should call readahead_folio or __readahead_batch in a loop, and attempt to start reads into each folio in the request. iconic behavior, honestly. 🌈

Most of the fields in this struct are private and should be accessed by the functions below. iykyk: don't go poking the private bits, bestie. 🙈

⭐ SEE ALSO ⭐

Kernel file: ./include/linux/pagemap.h — and here's the whole reference squad, every single one:

Source/version: ./include/linux · Date: October 2026 · page: struct readahead_control(9) — slay, bye bestie! 💖🎀

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