vfs_mountedon9
Check if the vnode belongs to a mounted file system
Usage
#include <sys/param.h>
#include <sys/mount.h>
int
vfs_mountedon(struct vnode *vp);
Overview
vfs_mountedon() inspects the mount structure in vp to determine 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 vnodes 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; otherwise, 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);
...
}