VOP_STRATEGY(9)

💫 VOP_STRATEGY ✨

okay so bestie, this one's from the Kernel Developer's Manual (section 9, in case the (9) wasn't a giveaway 👀) — and it's literally all about reading or writing a file system buffer. short page, but every word slays 💅

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🌸 NAME 🌸

VOP_STRATEGY — read or write a file system buffer 🎀

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🦋 SYNOPSIS 🦋

#include <sys/param.h>
#include <sys/buf.h>
#include <sys/vnode.h>

int
VOP_STRATEGY(struct vnode *vp, struct buf *bp);

like, you include those three headers first, no skipping, and then boom — there's the function signature, int return type and everything 🫶

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✨ DESCRIPTION ✨

so the arguments are, and I'm gonna be so real with you:

• vp — the vnode that the buffer is for. that's its whole job. it's the vnode. 💜
• bp — the buffer to be read or written. yep, that one's the buffer. iconic of it.

this call either reads or writes data from a file — and the way it decides is lowkey so simple, it just looks at the value of bp->b_iocmd 🧚

heads up: the call may block. so don't be out here acting surprised when it does, ok? 😭

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🔥 RETURN VALUES 🔥

always zero. like, always. zero. periodt 💀

so how do you actually signal errors? not through the return value, bestie. you set the BIO_ERROR bit in bp->b_ioflags, and you set bp->b_error to the appropriate errno value. that's the move — that's the whole vibe check ✨

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👑 SEE ALSO 👑

• errno(2)
• buf(9)
• vnode(9)

go read those too, iykyk 🌈

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🎀 AUTHORS 🎀

this manual page was written by Doug Rabson. ty for your service king 🫡💖

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k so that's the whole page — short and sweet and honestly kind of a vibe 💅 this was the Debian version, dated June 30, 2022, and yeah that's the VOP_STRATEGY(9) footer info, so now you know exactly which one you're looking at. mwah, go read your buffers 🦋🌸