VFS_READAHEAD(8)

🦋 VFS_READAHEAD — the section 8 girlie 💅

okay so bestie. you found a System Administration tools page, section 8, and it's called vfs_readahead. it's giving "pre-load the kernel buffer cache" and honestly? kinda iconic. let's get into it 🌸

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✨ NAME ✨

vfs_readahead — pre-load the kernel buffer cache 🫶

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✨ SYNOPSIS ✨

vfs objects = readahead

that's it. that's the whole vibe. one line and she's done 👑

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✨ DESCRIPTION ✨

so this VFS module is part of the samba(7) suite, no cap. she's a real one.

here's the tea: vfs_readahead keeps an eye out for read requests that land on multiples of a given offset (that's hex 0x80000 by default, bestie) and then she goes and tells the kernel — either through the readahead system call (on Linux) or the posix_fadvise system call — to pre-fetch that data right into the buffer cache. like a little psychic friend who already got your snack before you asked 🍓✨

she's super useful for Windows Vista clients reading data with the Windows Explorer program, because that program asynchronously fires off a whole bunch of multiple file read requests at offset boundaries of 0x80000 bytes. so yeah, she meets them exactly where they're at 😌

the offset multiple that does all this is set by the readahead:offset option, which defaults to 0x80000. periodt.

and the size of the disk read operations that vfs_readahead actually performs? that's decided by the readahead:length option. by default she sets it to the same value as the readahead:offset option, and if you don't set it explicitly she'll just use the current value of readahead:offset. she's flexible like that, we love her 💖

also — this module is stackable. stack her up, queen 🥞

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✨ OPTIONS ✨

• readahead:offset = BYTES — the offset multiple that causes readahead to be requested of the kernel buffer cache 🔥
• readahead:length = BYTES — the number of bytes requested to be read into the kernel buffer cache on each readahead call 🌈

now, these suffixes can be applied to BYTES, and you will use them:

• K — BYTES is a number of kilobytes
• M — BYTES is a number of megabytes
• G — BYTES is a number of gigabytes

pick your unit, slay 💅

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✨ EXAMPLES ✨

[hypothetical]
vfs objects = readahead

yes bestie, the original literally says [hypothetical]. it's a hypothetical, it's a concept, it's a mood 🎀

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✨ VERSION ✨

this man page is part of version 4.24.7-Ubuntu-4.24.7+dfsg-1ubuntu1 of the Samba suite. so that's the version, fr fr ⭐

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✨ AUTHOR ✨

the original Samba software and related utilities were created by Andrew Tridgell. Samba is now developed by the Samba Team as an Open Source project, similar to the way the Linux kernel is developed. legends only 👑💜

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and that's the whole page, bestie — no notes, she ate 💅✨ this one's from the Samba 4.24.7-Ubuntu-4.24.7+dfsg-1ubuntu1 era, dated 09/13/2026, and it is officially a wrap. mwah 🫶🎀