VFS_BUSY(9)

💖 VFS_BUSY(9) — Kernel Developer's Manual 💖

okay bestie, so you know how mount points can't just ✨vanish✨ while somebody's still using them? yeah. this is the page about that. vfs_busy — marks a mount point as busy. it's giving bouncer-at-the-club energy, no cap. 🎀

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✨ NAME ✨

vfs_busy — marks a mount point as busy 💅

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🌸 SYNOPSIS 🌸

#include <sys/param.h>
#include <sys/mount.h>

int
vfs_busy(struct mount *mp, int flags);

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🦋 DESCRIPTION 🦋

so vfs_busy() marks a mount point as busy by incrementing the reference count of a mount point. that's it, that's the main character move. 👑

it also delays unmounting by sleeping on mp if the MNTK_UNMOUNT flag is set in mp->mnt_kern_flag and the MBF_NOWAIT flag is not set. so if someone's mid-unmount, this function will literally take a lil nap until it's safe. not me being patient for once 😭

its arguments are:

• mp — the mount point to busy. 🫶
• flags — flags controlling how vfs_busy() should act. the whole vibe-check list:
  • MBF_NOWAIT — do not sleep if MNTK_UNMOUNT is set. (like, we're not waiting around, periodt.)
  • MBF_MNTLSTLOCK — drop the mountlist_mtx in the critical path.

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🔥 RETURN VALUES 🔥

a 0 value is returned on success. slay. ✨

if the mount point is being unmounted and the MBF_NOWAIT flag is specified, ENOENT will be returned. so close, but no 💀

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💜 ERRORS 💜

• [ENOENT] — the mount point is being unmounted (MNTK_UNMOUNT is set). it's giving "sorry bestie, door's closed" 🙈

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🌈 SEE ALSO 🌈

• vfs_unbusy(9) — the other half of the situationship 💞

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👑 AUTHORS 👑

this manual page was written by Chad David <davidc@acns.ab.ca>. absolute icon, we thank him for his service 🫡

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and that's the whole page, bestie! go forth and busy your mount points responsibly 🧚

Debian · February 11, 2013 · VFS_BUSY(9) 💖 — ok that's the version + date + manual name, mwah, see you in the next manpage ✨🎀🌸