VFS(9)

💅 VFS(9) — like, the kernel's whole interface to file systems, bestie

okay so first things first: this is from the Kernel Developer's Manual, section 9, and the page is literally called VFS. That's the vibe. Keep that in your back pocket 🫶

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✨ NAME ✨

VFS — the kernel interface to file systems. that's it, that's the whole name section, she's concise 💅

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🦋 DESCRIPTION 🦋

so basically these are the calls you use to set or query file systems for settings or information. like, the kernel goes "hey fs, what's good" and the fs answers. very main character energy 👑

here's the part where you gotta pay attention though, bestie, because this is the actual rule:

• File systems that do not implement a VFS operation should use the appropriate vfs_std function from src/sys/kern/vfs_default.c rather than implementing empty functions or casting to eopnotsupp.

no cap, that's the whole thing. don't write an empty function, don't get cute with a cast to eopnotsupp — just grab the matching vfs_std from src/sys/kern/vfs_default.c and move on. it's giving "use the library, karen" 😭 the file path is src/sys/kern/vfs_default.c btw, write it down ✨

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🌈 SEE ALSO 🌈

go read these next, i'm obsessed with how much cross-referencing is happening here 🔥

• dtrace_vfs(4)
• VFS_CHECKEXP(9)
• VFS_FHTOVP(9)
• VFS_MOUNT(9)
• VFS_QUOTACTL(9)
• VFS_SET(9)
• VFS_STATFS(9)
• VFS_SYNC(9)
• VFS_UNMOUNT(9)
• VFS_VGET(9)
• vnode(9)
• VOP_VPTOFH(9)

like, every single one, no skips 🎀

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🧚 AUTHORS 🧚

This manual page was written by Doug Rabson. king behavior, honestly 👑 we love a credited author.

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💖 reminder bestie: vfs_std from src/sys/kern/vfs_default.c. not an empty function. not an eopnotsupp cast. we've been over this 💅

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and that's the whole page, fr fr — brought to you by Debian, dated November 3, 2025, and filed under VFS(9) in the manual, mwah 💋🌸