vfs_mountedon(9)

NAME

vfs_mountedon - check if the vnode belongs to a mounted file

system

SYNOPSIS

#include <sys/param.h>
#include <sys/mount.h>
int
vfs_mountedon(struct vnode *vp);

DESCRIPTION

vfs_mountedon() inspects the mount structure in vp to deter

mine if it
points to a valid mount point. If the mount is valid, the

vnode is considered to be busy.

A common use of vfs_mountedon() is to call it on device vn

odes to determine if they are already associated with a file system.

This is done to
prevent multiple mounts on the same device.

RETURN VALUES

EBUSY is returned if the vnode has a valid mount point; oth

erwise, 0 is
returned.

PSEUDOCODE

int
ffs_mountfs(devvp, mp, td, malloctype)

register struct vnode *devvp;
struct mount *mp;
struct thread *td;
struct malloc_type *malloctype;

{

...

error = vfs_mountedon(devvp);
if (error)

return (error);

...

}

AUTHORS

This manual page was written by Chad David <davidc@ac

ns.ab.ca>.

BSD November 21, 2001

BSD