VFS_MOUNT(9)

💖 NAME 💖

okay so this is the VFS_MOUNT(9) page from the Kernel Developer's Manual, and it's literally about VFS_MOUNT — mount a file system. no cap, that's the whole vibe ✨

🌸 SYNOPSIS 🌸

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

int
VFS_MOUNT(struct mount *mp);

🦋 DESCRIPTION 🦋

the VFS_MOUNT() macro mounts a file system into the system's namespace or updates the attributes of an already mounted file system. it's giving "two jobs, one icon" 💅

🎀 the argument it expects 🎀

• mp — Structure representing the file system.

okay so here's the tea: the VFS_MOUNT() macro is called both to mount new file systems and to change the attributes of an existing file system. like, it's versatile fr fr.

if the MNT_UPDATE flag is set in mp->mnt_flag, then the file system should update its internal state from the value of mp->mnt_flag. this can be used, for instance, to convert a read-only file system to read-write. it is also used by mountd(8) to update the NFS export information for the file system. the way that's a whole glow-up for your mount 🫶

if the MNT_UPDATE flag is not specified, then this is a newly mounted file system. the file system code should allocate and initialize any private data needed to represent the file system — and yes bestie, it can use the mp->mnt_data field to store this information. slay 💾✨

👑 SEE ALSO 👑

go check out VFS(9) and vnode(9) — iykyk 🔥

💜 AUTHORS 💜

This manual page was written by Doug Rabson. iconic behavior, honestly 🌈

mwah 💋 — this little page is from Debian, dated May 23, 2009. periodt 🎀